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authorKaren Xie <kxie@chelsio.com>2008-12-09 17:15:32 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-30 11:45:33 -0500
commitc3673464ebc004a3d82063cd41b9cf74d1b55db2 (patch)
treeb061ecd04da7dd3ddddad8f39a4922f437493311 /drivers/scsi/cxgb3i
parentb632ade282895562924d18b8eedd11a825f4b08c (diff)
[SCSI] cxgb3i: Add cxgb3i iSCSI driver.
This patch implements the cxgb3i iscsi connection acceleration for the open-iscsi initiator. The cxgb3i driver offers the iscsi PDU based offload: - digest insertion and verification - payload direct-placement into host memory buffer. Signed-off-by: Karen Xie <kxie@chelsio.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/cxgb3i')
-rw-r--r--drivers/scsi/cxgb3i/Kbuild4
-rw-r--r--drivers/scsi/cxgb3i/Kconfig6
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i.h139
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_ddp.c770
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_ddp.h306
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_init.c107
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_iscsi.c951
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_offload.c1810
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_offload.h231
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_pdu.c402
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_pdu.h59
11 files changed, 4785 insertions, 0 deletions
diff --git a/drivers/scsi/cxgb3i/Kbuild b/drivers/scsi/cxgb3i/Kbuild
new file mode 100644
index 000000000000..ee7d6d2f9c3b
--- /dev/null
+++ b/drivers/scsi/cxgb3i/Kbuild
@@ -0,0 +1,4 @@
1EXTRA_CFLAGS += -I$(TOPDIR)/drivers/net/cxgb3
2
3cxgb3i-y := cxgb3i_init.o cxgb3i_iscsi.o cxgb3i_pdu.o cxgb3i_offload.o
4obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i_ddp.o cxgb3i.o
diff --git a/drivers/scsi/cxgb3i/Kconfig b/drivers/scsi/cxgb3i/Kconfig
new file mode 100644
index 000000000000..276281460ece
--- /dev/null
+++ b/drivers/scsi/cxgb3i/Kconfig
@@ -0,0 +1,6 @@
1config SCSI_CXGB3_ISCSI
2 tristate "Chelsio S3xx iSCSI support"
3 select CHELSIO_T3
4 select SCSI_ISCSI_ATTRS
5 ---help---
6 This driver supports iSCSI offload for the Chelsio S3 series devices.
diff --git a/drivers/scsi/cxgb3i/cxgb3i.h b/drivers/scsi/cxgb3i/cxgb3i.h
new file mode 100644
index 000000000000..fde6e4c634e7
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i.h
@@ -0,0 +1,139 @@
1/*
2 * cxgb3i.h: Chelsio S3xx iSCSI driver.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 */
12
13#ifndef __CXGB3I_H__
14#define __CXGB3I_H__
15
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/errno.h>
19#include <linux/types.h>
20#include <linux/list.h>
21#include <linux/netdevice.h>
22#include <linux/scatterlist.h>
23#include <scsi/libiscsi_tcp.h>
24
25/* from cxgb3 LLD */
26#include "common.h"
27#include "t3_cpl.h"
28#include "t3cdev.h"
29#include "cxgb3_ctl_defs.h"
30#include "cxgb3_offload.h"
31#include "firmware_exports.h"
32
33#include "cxgb3i_offload.h"
34#include "cxgb3i_ddp.h"
35
36#define CXGB3I_SCSI_QDEPTH_DFLT 128
37#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
38#define CXGB3I_MAX_LUN 512
39#define ISCSI_PDU_NONPAYLOAD_MAX \
40 (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
41
42struct cxgb3i_adapter;
43struct cxgb3i_hba;
44struct cxgb3i_endpoint;
45
46/**
47 * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
48 *
49 * @snic: cxgb3i adapter containing this port
50 * @ndev: pointer to netdev structure
51 * @shost: pointer to scsi host structure
52 */
53struct cxgb3i_hba {
54 struct cxgb3i_adapter *snic;
55 struct net_device *ndev;
56 struct Scsi_Host *shost;
57};
58
59/**
60 * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
61 *
62 * @listhead: list head to link elements
63 * @lock: lock for this structure
64 * @tdev: pointer to t3cdev used by cxgb3 driver
65 * @pdev: pointer to pci dev
66 * @hba_cnt: # of hbas (the same as # of ports)
67 * @hba: all the hbas on this adapter
68 * @tx_max_size: max. tx packet size supported
69 * @rx_max_size: max. rx packet size supported
70 * @tag_format: ddp tag format settings
71 */
72struct cxgb3i_adapter {
73 struct list_head list_head;
74 spinlock_t lock;
75 struct t3cdev *tdev;
76 struct pci_dev *pdev;
77 unsigned char hba_cnt;
78 struct cxgb3i_hba *hba[MAX_NPORTS];
79
80 unsigned int tx_max_size;
81 unsigned int rx_max_size;
82
83 struct cxgb3i_tag_format tag_format;
84};
85
86/**
87 * struct cxgb3i_conn - cxgb3i iscsi connection
88 *
89 * @listhead: list head to link elements
90 * @cep: pointer to iscsi_endpoint structure
91 * @conn: pointer to iscsi_conn structure
92 * @hba: pointer to the hba this conn. is going through
93 * @task_idx_bits: # of bits needed for session->cmds_max
94 */
95struct cxgb3i_conn {
96 struct list_head list_head;
97 struct cxgb3i_endpoint *cep;
98 struct iscsi_conn *conn;
99 struct cxgb3i_hba *hba;
100 unsigned int task_idx_bits;
101};
102
103/**
104 * struct cxgb3i_endpoint - iscsi tcp endpoint
105 *
106 * @c3cn: the h/w tcp connection representation
107 * @hba: pointer to the hba this conn. is going through
108 * @cconn: pointer to the associated cxgb3i iscsi connection
109 */
110struct cxgb3i_endpoint {
111 struct s3_conn *c3cn;
112 struct cxgb3i_hba *hba;
113 struct cxgb3i_conn *cconn;
114};
115
116int cxgb3i_iscsi_init(void);
117void cxgb3i_iscsi_cleanup(void);
118
119struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *);
120void cxgb3i_adapter_remove(struct t3cdev *);
121int cxgb3i_adapter_ulp_init(struct cxgb3i_adapter *);
122void cxgb3i_adapter_ulp_cleanup(struct cxgb3i_adapter *);
123
124struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *);
125struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
126 struct net_device *);
127void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
128
129int cxgb3i_pdu_init(void);
130void cxgb3i_pdu_cleanup(void);
131void cxgb3i_conn_cleanup_task(struct iscsi_task *);
132int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
133int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
134int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
135
136void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
137int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
138
139#endif
diff --git a/drivers/scsi/cxgb3i/cxgb3i_ddp.c b/drivers/scsi/cxgb3i/cxgb3i_ddp.c
new file mode 100644
index 000000000000..1a41f04264f7
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_ddp.c
@@ -0,0 +1,770 @@
1/*
2 * cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 */
12
13#include <linux/skbuff.h>
14
15/* from cxgb3 LLD */
16#include "common.h"
17#include "t3_cpl.h"
18#include "t3cdev.h"
19#include "cxgb3_ctl_defs.h"
20#include "cxgb3_offload.h"
21#include "firmware_exports.h"
22
23#include "cxgb3i_ddp.h"
24
25#define DRV_MODULE_NAME "cxgb3i_ddp"
26#define DRV_MODULE_VERSION "1.0.0"
27#define DRV_MODULE_RELDATE "Dec. 1, 2008"
28
29static char version[] =
30 "Chelsio S3xx iSCSI DDP " DRV_MODULE_NAME
31 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
32
33MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
34MODULE_DESCRIPTION("cxgb3i ddp pagepod manager");
35MODULE_LICENSE("GPL");
36MODULE_VERSION(DRV_MODULE_VERSION);
37
38#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
39#define ddp_log_warn(fmt...) printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
40#define ddp_log_info(fmt...) printk(KERN_INFO "cxgb3i_ddp: " fmt)
41
42#ifdef __DEBUG_CXGB3I_DDP__
43#define ddp_log_debug(fmt, args...) \
44 printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
45#else
46#define ddp_log_debug(fmt...)
47#endif
48
49/*
50 * iSCSI Direct Data Placement
51 *
52 * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
53 * pre-posted final destination host-memory buffers based on the Initiator
54 * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
55 *
56 * The host memory address is programmed into h/w in the format of pagepod
57 * entries.
58 * The location of the pagepod entry is encoded into ddp tag which is used or
59 * is the base for ITT/TTT.
60 */
61
62#define DDP_PGIDX_MAX 4
63#define DDP_THRESHOLD 2048
64static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
65static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
66static unsigned char page_idx = DDP_PGIDX_MAX;
67
68static LIST_HEAD(cxgb3i_ddp_list);
69static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
70
71/*
72 * functions to program the pagepod in h/w
73 */
74static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
75{
76 struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
77
78 req->wr.wr_lo = 0;
79 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
80 req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
81 V_ULPTX_CMD(ULP_MEM_WRITE));
82 req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
83 V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
84}
85
86static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
87 unsigned int idx, unsigned int npods,
88 struct cxgb3i_gather_list *gl)
89{
90 unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
91 int i;
92
93 for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
94 struct sk_buff *skb = ddp->gl_skb[idx];
95 struct pagepod *ppod;
96 int j, pidx;
97
98 /* hold on to the skb until we clear the ddp mapping */
99 skb_get(skb);
100
101 ulp_mem_io_set_hdr(skb, pm_addr);
102 ppod = (struct pagepod *)
103 (skb->head + sizeof(struct ulp_mem_io));
104 memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
105 for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
106 ppod->addr[j] = pidx < gl->nelem ?
107 cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
108
109 skb->priority = CPL_PRIORITY_CONTROL;
110 cxgb3_ofld_send(ddp->tdev, skb);
111 }
112 return 0;
113}
114
115static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
116 unsigned int npods)
117{
118 unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
119 int i;
120
121 for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
122 struct sk_buff *skb = ddp->gl_skb[idx];
123
124 ddp->gl_skb[idx] = NULL;
125 memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
126 ulp_mem_io_set_hdr(skb, pm_addr);
127 skb->priority = CPL_PRIORITY_CONTROL;
128 cxgb3_ofld_send(ddp->tdev, skb);
129 }
130 return 0;
131}
132
133static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
134 int start, int max, int count,
135 struct cxgb3i_gather_list *gl)
136{
137 unsigned int i, j;
138
139 spin_lock(&ddp->map_lock);
140 for (i = start; i <= max;) {
141 for (j = 0; j < count; j++) {
142 if (ddp->gl_map[i + j])
143 break;
144 }
145 if (j == count) {
146 for (j = 0; j < count; j++)
147 ddp->gl_map[i + j] = gl;
148 spin_unlock(&ddp->map_lock);
149 return i;
150 }
151 i += j + 1;
152 }
153 spin_unlock(&ddp->map_lock);
154 return -EBUSY;
155}
156
157static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
158 int start, int count)
159{
160 spin_lock(&ddp->map_lock);
161 memset(&ddp->gl_map[start], 0,
162 count * sizeof(struct cxgb3i_gather_list *));
163 spin_unlock(&ddp->map_lock);
164}
165
166static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
167 int idx, int count)
168{
169 int i;
170
171 for (i = 0; i < count; i++, idx++)
172 if (ddp->gl_skb[idx]) {
173 kfree_skb(ddp->gl_skb[idx]);
174 ddp->gl_skb[idx] = NULL;
175 }
176}
177
178static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
179 int count, gfp_t gfp)
180{
181 int i;
182
183 for (i = 0; i < count; i++) {
184 struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
185 PPOD_SIZE, gfp);
186 if (skb) {
187 ddp->gl_skb[idx + i] = skb;
188 skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
189 } else {
190 ddp_free_gl_skb(ddp, idx, i);
191 return -ENOMEM;
192 }
193 }
194 return 0;
195}
196
197/**
198 * cxgb3i_ddp_find_page_index - return ddp page index for a given page size.
199 * @pgsz: page size
200 * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
201 */
202int cxgb3i_ddp_find_page_index(unsigned long pgsz)
203{
204 int i;
205
206 for (i = 0; i < DDP_PGIDX_MAX; i++) {
207 if (pgsz == (1UL << ddp_page_shift[i]))
208 return i;
209 }
210 ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
211 return DDP_PGIDX_MAX;
212}
213EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
214
215static inline void ddp_gl_unmap(struct pci_dev *pdev,
216 struct cxgb3i_gather_list *gl)
217{
218 int i;
219
220 for (i = 0; i < gl->nelem; i++)
221 pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
222 PCI_DMA_FROMDEVICE);
223}
224
225static inline int ddp_gl_map(struct pci_dev *pdev,
226 struct cxgb3i_gather_list *gl)
227{
228 int i;
229
230 for (i = 0; i < gl->nelem; i++) {
231 gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
232 PAGE_SIZE,
233 PCI_DMA_FROMDEVICE);
234 if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
235 goto unmap;
236 }
237
238 return i;
239
240unmap:
241 if (i) {
242 unsigned int nelem = gl->nelem;
243
244 gl->nelem = i;
245 ddp_gl_unmap(pdev, gl);
246 gl->nelem = nelem;
247 }
248 return -ENOMEM;
249}
250
251/**
252 * cxgb3i_ddp_make_gl - build ddp page buffer list
253 * @xferlen: total buffer length
254 * @sgl: page buffer scatter-gather list
255 * @sgcnt: # of page buffers
256 * @pdev: pci_dev, used for pci map
257 * @gfp: allocation mode
258 *
259 * construct a ddp page buffer list from the scsi scattergather list.
260 * coalesce buffers as much as possible, and obtain dma addresses for
261 * each page.
262 *
263 * Return the cxgb3i_gather_list constructed from the page buffers if the
264 * memory can be used for ddp. Return NULL otherwise.
265 */
266struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
267 struct scatterlist *sgl,
268 unsigned int sgcnt,
269 struct pci_dev *pdev,
270 gfp_t gfp)
271{
272 struct cxgb3i_gather_list *gl;
273 struct scatterlist *sg = sgl;
274 struct page *sgpage = sg_page(sg);
275 unsigned int sglen = sg->length;
276 unsigned int sgoffset = sg->offset;
277 unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
278 PAGE_SHIFT;
279 int i = 1, j = 0;
280
281 if (xferlen < DDP_THRESHOLD) {
282 ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
283 xferlen, DDP_THRESHOLD);
284 return NULL;
285 }
286
287 gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
288 npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
289 gfp);
290 if (!gl)
291 return NULL;
292
293 gl->pages = (struct page **)&gl->phys_addr[npages];
294 gl->length = xferlen;
295 gl->offset = sgoffset;
296 gl->pages[0] = sgpage;
297
298 sg = sg_next(sg);
299 while (sg) {
300 struct page *page = sg_page(sg);
301
302 if (sgpage == page && sg->offset == sgoffset + sglen)
303 sglen += sg->length;
304 else {
305 /* make sure the sgl is fit for ddp:
306 * each has the same page size, and
307 * all of the middle pages are used completely
308 */
309 if ((j && sgoffset) ||
310 ((i != sgcnt - 1) &&
311 ((sglen + sgoffset) & ~PAGE_MASK)))
312 goto error_out;
313
314 j++;
315 if (j == gl->nelem || sg->offset)
316 goto error_out;
317 gl->pages[j] = page;
318 sglen = sg->length;
319 sgoffset = sg->offset;
320 sgpage = page;
321 }
322 i++;
323 sg = sg_next(sg);
324 }
325 gl->nelem = ++j;
326
327 if (ddp_gl_map(pdev, gl) < 0)
328 goto error_out;
329
330 return gl;
331
332error_out:
333 kfree(gl);
334 return NULL;
335}
336EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
337
338/**
339 * cxgb3i_ddp_release_gl - release a page buffer list
340 * @gl: a ddp page buffer list
341 * @pdev: pci_dev used for pci_unmap
342 * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
343 */
344void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
345 struct pci_dev *pdev)
346{
347 ddp_gl_unmap(pdev, gl);
348 kfree(gl);
349}
350EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
351
352/**
353 * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
354 * @tdev: t3cdev adapter
355 * @tid: connection id
356 * @tformat: tag format
357 * @tagp: the s/w tag, if ddp setup is successful, it will be updated with
358 * ddp/hw tag
359 * @gl: the page momory list
360 * @gfp: allocation mode
361 *
362 * ddp setup for a given page buffer list and construct the ddp tag.
363 * return 0 if success, < 0 otherwise.
364 */
365int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
366 struct cxgb3i_tag_format *tformat, u32 *tagp,
367 struct cxgb3i_gather_list *gl, gfp_t gfp)
368{
369 struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
370 struct pagepod_hdr hdr;
371 unsigned int npods;
372 int idx = -1, idx_max;
373 int err = -ENOMEM;
374 u32 sw_tag = *tagp;
375 u32 tag;
376
377 if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
378 gl->length < DDP_THRESHOLD) {
379 ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
380 page_idx, gl->length, DDP_THRESHOLD);
381 return -EINVAL;
382 }
383
384 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
385 idx_max = ddp->nppods - npods + 1;
386
387 if (ddp->idx_last == ddp->nppods)
388 idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
389 else {
390 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
391 idx_max, npods, gl);
392 if (idx < 0 && ddp->idx_last >= npods)
393 idx = ddp_find_unused_entries(ddp, 0,
394 ddp->idx_last - npods + 1,
395 npods, gl);
396 }
397 if (idx < 0) {
398 ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
399 gl->length, gl->nelem, npods);
400 return idx;
401 }
402
403 err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
404 if (err < 0)
405 goto unmark_entries;
406
407 tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
408 tag |= idx << PPOD_IDX_SHIFT;
409
410 hdr.rsvd = 0;
411 hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
412 hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
413 hdr.maxoffset = htonl(gl->length);
414 hdr.pgoffset = htonl(gl->offset);
415
416 err = set_ddp_map(ddp, &hdr, idx, npods, gl);
417 if (err < 0)
418 goto free_gl_skb;
419
420 ddp->idx_last = idx;
421 ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
422 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
423 idx, npods);
424 *tagp = tag;
425 return 0;
426
427free_gl_skb:
428 ddp_free_gl_skb(ddp, idx, npods);
429unmark_entries:
430 ddp_unmark_entries(ddp, idx, npods);
431 return err;
432}
433EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_reserve);
434
435/**
436 * cxgb3i_ddp_tag_release - release a ddp tag
437 * @tdev: t3cdev adapter
438 * @tag: ddp tag
439 * ddp cleanup for a given ddp tag and release all the resources held
440 */
441void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
442{
443 struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
444 u32 idx;
445
446 if (!ddp) {
447 ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
448 return;
449 }
450
451 idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
452 if (idx < ddp->nppods) {
453 struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
454 unsigned int npods;
455
456 if (!gl) {
457 ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
458 tag, idx);
459 return;
460 }
461 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
462 ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
463 tag, idx, npods);
464 clear_ddp_map(ddp, idx, npods);
465 ddp_unmark_entries(ddp, idx, npods);
466 cxgb3i_ddp_release_gl(gl, ddp->pdev);
467 } else
468 ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
469 tag, idx, ddp->nppods);
470}
471EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_release);
472
473static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
474 int reply)
475{
476 struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
477 GFP_KERNEL);
478 struct cpl_set_tcb_field *req;
479 u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
480
481 if (!skb)
482 return -ENOMEM;
483
484 /* set up ulp submode and page size */
485 req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
486 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
487 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
488 req->reply = V_NO_REPLY(reply ? 0 : 1);
489 req->cpu_idx = 0;
490 req->word = htons(31);
491 req->mask = cpu_to_be64(0xF0000000);
492 req->val = cpu_to_be64(val << 28);
493 skb->priority = CPL_PRIORITY_CONTROL;
494
495 cxgb3_ofld_send(tdev, skb);
496 return 0;
497}
498
499/**
500 * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
501 * @tdev: t3cdev adapter
502 * @tid: connection id
503 * @reply: request reply from h/w
504 * set up the ddp page size based on the host PAGE_SIZE for a connection
505 * identified by tid
506 */
507int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
508 int reply)
509{
510 return setup_conn_pgidx(tdev, tid, page_idx, reply);
511}
512EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_host_pagesize);
513
514/**
515 * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
516 * @tdev: t3cdev adapter
517 * @tid: connection id
518 * @reply: request reply from h/w
519 * @pgsz: ddp page size
520 * set up the ddp page size for a connection identified by tid
521 */
522int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
523 int reply, unsigned long pgsz)
524{
525 int pgidx = cxgb3i_ddp_find_page_index(pgsz);
526
527 return setup_conn_pgidx(tdev, tid, pgidx, reply);
528}
529EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_pagesize);
530
531/**
532 * cxgb3i_setup_conn_digest - setup conn. digest setting
533 * @tdev: t3cdev adapter
534 * @tid: connection id
535 * @hcrc: header digest enabled
536 * @dcrc: data digest enabled
537 * @reply: request reply from h/w
538 * set up the iscsi digest settings for a connection identified by tid
539 */
540int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
541 int hcrc, int dcrc, int reply)
542{
543 struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
544 GFP_KERNEL);
545 struct cpl_set_tcb_field *req;
546 u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
547
548 if (!skb)
549 return -ENOMEM;
550
551 /* set up ulp submode and page size */
552 req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
553 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
554 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
555 req->reply = V_NO_REPLY(reply ? 0 : 1);
556 req->cpu_idx = 0;
557 req->word = htons(31);
558 req->mask = cpu_to_be64(0x0F000000);
559 req->val = cpu_to_be64(val << 24);
560 skb->priority = CPL_PRIORITY_CONTROL;
561
562 cxgb3_ofld_send(tdev, skb);
563 return 0;
564}
565EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
566
567static int ddp_init(struct t3cdev *tdev)
568{
569 struct cxgb3i_ddp_info *ddp;
570 struct ulp_iscsi_info uinfo;
571 unsigned int ppmax, bits;
572 int i, err;
573 static int vers_printed;
574
575 if (!vers_printed) {
576 printk(KERN_INFO "%s", version);
577 vers_printed = 1;
578 }
579
580 err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
581 if (err < 0) {
582 ddp_log_error("%s, failed to get iscsi param err=%d.\n",
583 tdev->name, err);
584 return err;
585 }
586
587 ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
588 bits = __ilog2_u32(ppmax) + 1;
589 if (bits > PPOD_IDX_MAX_SIZE)
590 bits = PPOD_IDX_MAX_SIZE;
591 ppmax = (1 << (bits - 1)) - 1;
592
593 ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
594 ppmax *
595 (sizeof(struct cxgb3i_gather_list *) +
596 sizeof(struct sk_buff *)),
597 GFP_KERNEL);
598 if (!ddp) {
599 ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
600 tdev->name, ppmax);
601 return 0;
602 }
603 ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
604 ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
605 ppmax *
606 sizeof(struct cxgb3i_gather_list *));
607 spin_lock_init(&ddp->map_lock);
608
609 ddp->tdev = tdev;
610 ddp->pdev = uinfo.pdev;
611 ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
612 ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
613 ddp->llimit = uinfo.llimit;
614 ddp->ulimit = uinfo.ulimit;
615 ddp->nppods = ppmax;
616 ddp->idx_last = ppmax;
617 ddp->idx_bits = bits;
618 ddp->idx_mask = (1 << bits) - 1;
619 ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
620
621 uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
622 for (i = 0; i < DDP_PGIDX_MAX; i++)
623 uinfo.pgsz_factor[i] = ddp_page_order[i];
624 uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
625
626 err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
627 if (err < 0) {
628 ddp_log_warn("%s unable to set iscsi param err=%d, "
629 "ddp disabled.\n", tdev->name, err);
630 goto free_ddp_map;
631 }
632
633 tdev->ulp_iscsi = ddp;
634
635 /* add to the list */
636 write_lock(&cxgb3i_ddp_rwlock);
637 list_add_tail(&ddp->list, &cxgb3i_ddp_list);
638 write_unlock(&cxgb3i_ddp_rwlock);
639
640 ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
641 "pkt %u,%u.\n",
642 ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
643 ddp->idx_mask, ddp->rsvd_tag_mask,
644 ddp->max_txsz, ddp->max_rxsz);
645 return 0;
646
647free_ddp_map:
648 cxgb3i_free_big_mem(ddp);
649 return err;
650}
651
652/**
653 * cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
654 * @tdev: t3cdev adapter
655 * @tformat: tag format
656 * @txsz: max tx pkt size, filled in by this func.
657 * @rxsz: max rx pkt size, filled in by this func.
658 * initialize the ddp pagepod manager for a given adapter if needed and
659 * setup the tag format for a given iscsi entity
660 */
661int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
662 struct cxgb3i_tag_format *tformat,
663 unsigned int *txsz, unsigned int *rxsz)
664{
665 struct cxgb3i_ddp_info *ddp;
666 unsigned char idx_bits;
667
668 if (!tformat)
669 return -EINVAL;
670
671 if (!tdev->ulp_iscsi) {
672 int err = ddp_init(tdev);
673 if (err < 0)
674 return err;
675 }
676 ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
677
678 idx_bits = 32 - tformat->sw_bits;
679 tformat->rsvd_bits = ddp->idx_bits;
680 tformat->rsvd_shift = PPOD_IDX_SHIFT;
681 tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
682
683 ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
684 tformat->sw_bits, tformat->rsvd_bits,
685 tformat->rsvd_shift, tformat->rsvd_mask);
686
687 *txsz = ddp->max_txsz;
688 *rxsz = ddp->max_rxsz;
689 ddp_log_info("ddp max pkt size: %u, %u.\n",
690 ddp->max_txsz, ddp->max_rxsz);
691 return 0;
692}
693EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
694
695static void ddp_release(struct cxgb3i_ddp_info *ddp)
696{
697 int i = 0;
698 struct t3cdev *tdev = ddp->tdev;
699
700 tdev->ulp_iscsi = NULL;
701 while (i < ddp->nppods) {
702 struct cxgb3i_gather_list *gl = ddp->gl_map[i];
703 if (gl) {
704 int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
705 >> PPOD_PAGES_SHIFT;
706
707 kfree(gl);
708 ddp_free_gl_skb(ddp, i, npods);
709 } else
710 i++;
711 }
712 cxgb3i_free_big_mem(ddp);
713}
714
715/**
716 * cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
717 * @tdev: t3cdev adapter
718 * release all the resource held by the ddp pagepod manager for a given
719 * adapter if needed
720 */
721void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
722{
723 struct cxgb3i_ddp_info *ddp;
724
725 /* remove from the list */
726 write_lock(&cxgb3i_ddp_rwlock);
727 list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
728 if (ddp->tdev == tdev) {
729 list_del(&ddp->list);
730 break;
731 }
732 }
733 write_unlock(&cxgb3i_ddp_rwlock);
734
735 if (ddp)
736 ddp_release(ddp);
737}
738EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
739
740/**
741 * cxgb3i_ddp_init_module - module init entry point
742 * initialize any driver wide global data structures
743 */
744static int __init cxgb3i_ddp_init_module(void)
745{
746 page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
747 ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
748 PAGE_SIZE, page_idx);
749 return 0;
750}
751
752/**
753 * cxgb3i_ddp_exit_module - module cleanup/exit entry point
754 * go through the ddp list and release any resource held.
755 */
756static void __exit cxgb3i_ddp_exit_module(void)
757{
758 struct cxgb3i_ddp_info *ddp;
759
760 /* release all ddp manager if there is any */
761 write_lock(&cxgb3i_ddp_rwlock);
762 list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
763 list_del(&ddp->list);
764 ddp_release(ddp);
765 }
766 write_unlock(&cxgb3i_ddp_rwlock);
767}
768
769module_init(cxgb3i_ddp_init_module);
770module_exit(cxgb3i_ddp_exit_module);
diff --git a/drivers/scsi/cxgb3i/cxgb3i_ddp.h b/drivers/scsi/cxgb3i/cxgb3i_ddp.h
new file mode 100644
index 000000000000..5c7c4d95c493
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_ddp.h
@@ -0,0 +1,306 @@
1/*
2 * cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 */
12
13#ifndef __CXGB3I_ULP2_DDP_H__
14#define __CXGB3I_ULP2_DDP_H__
15
16/**
17 * struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
18 *
19 * @sw_bits: # of bits used by iscsi software layer
20 * @rsvd_bits: # of bits used by h/w
21 * @rsvd_shift: h/w bits shift left
22 * @rsvd_mask: reserved bit mask
23 */
24struct cxgb3i_tag_format {
25 unsigned char sw_bits;
26 unsigned char rsvd_bits;
27 unsigned char rsvd_shift;
28 unsigned char filler[1];
29 u32 rsvd_mask;
30};
31
32/**
33 * struct cxgb3i_gather_list - cxgb3i direct data placement memory
34 *
35 * @tag: ddp tag
36 * @length: total data buffer length
37 * @offset: initial offset to the 1st page
38 * @nelem: # of pages
39 * @pages: page pointers
40 * @phys_addr: physical address
41 */
42struct cxgb3i_gather_list {
43 u32 tag;
44 unsigned int length;
45 unsigned int offset;
46 unsigned int nelem;
47 struct page **pages;
48 dma_addr_t phys_addr[0];
49};
50
51/**
52 * struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
53 *
54 * @list: list head to link elements
55 * @tdev: pointer to t3cdev used by cxgb3 driver
56 * @max_txsz: max tx packet size for ddp
57 * @max_rxsz: max rx packet size for ddp
58 * @llimit: lower bound of the page pod memory
59 * @ulimit: upper bound of the page pod memory
60 * @nppods: # of page pod entries
61 * @idx_last: page pod entry last used
62 * @idx_bits: # of bits the pagepod index would take
63 * @idx_mask: pagepod index mask
64 * @rsvd_tag_mask: tag mask
65 * @map_lock: lock to synchonize access to the page pod map
66 * @gl_map: ddp memory gather list
67 * @gl_skb: skb used to program the pagepod
68 */
69struct cxgb3i_ddp_info {
70 struct list_head list;
71 struct t3cdev *tdev;
72 struct pci_dev *pdev;
73 unsigned int max_txsz;
74 unsigned int max_rxsz;
75 unsigned int llimit;
76 unsigned int ulimit;
77 unsigned int nppods;
78 unsigned int idx_last;
79 unsigned char idx_bits;
80 unsigned char filler[3];
81 u32 idx_mask;
82 u32 rsvd_tag_mask;
83 spinlock_t map_lock;
84 struct cxgb3i_gather_list **gl_map;
85 struct sk_buff **gl_skb;
86};
87
88#define ULP2_MAX_PKT_SIZE 16224
89#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_MAX)
90#define PPOD_PAGES_MAX 4
91#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
92
93/*
94 * struct pagepod_hdr, pagepod - pagepod format
95 */
96struct pagepod_hdr {
97 u32 vld_tid;
98 u32 pgsz_tag_clr;
99 u32 maxoffset;
100 u32 pgoffset;
101 u64 rsvd;
102};
103
104struct pagepod {
105 struct pagepod_hdr hdr;
106 u64 addr[PPOD_PAGES_MAX + 1];
107};
108
109#define PPOD_SIZE sizeof(struct pagepod) /* 64 */
110#define PPOD_SIZE_SHIFT 6
111
112#define PPOD_COLOR_SHIFT 0
113#define PPOD_COLOR_SIZE 6
114#define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
115
116#define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
117#define PPOD_IDX_MAX_SIZE 24
118
119#define S_PPOD_TID 0
120#define M_PPOD_TID 0xFFFFFF
121#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
122
123#define S_PPOD_VALID 24
124#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
125#define F_PPOD_VALID V_PPOD_VALID(1U)
126
127#define S_PPOD_COLOR 0
128#define M_PPOD_COLOR 0x3F
129#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
130
131#define S_PPOD_TAG 6
132#define M_PPOD_TAG 0xFFFFFF
133#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
134
135#define S_PPOD_PGSZ 30
136#define M_PPOD_PGSZ 0x3
137#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
138
139/*
140 * large memory chunk allocation/release
141 * use vmalloc() if kmalloc() fails
142 */
143static inline void *cxgb3i_alloc_big_mem(unsigned int size,
144 gfp_t gfp)
145{
146 void *p = kmalloc(size, gfp);
147 if (!p)
148 p = vmalloc(size);
149 if (p)
150 memset(p, 0, size);
151 return p;
152}
153
154static inline void cxgb3i_free_big_mem(void *addr)
155{
156 if (is_vmalloc_addr(addr))
157 vfree(addr);
158 else
159 kfree(addr);
160}
161
162/*
163 * cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
164 * non-reserved bits that can be used by the iscsi s/w.
165 * The reserved bits are identified by the rsvd_bits and rsvd_shift fields
166 * in struct cxgb3i_tag_format.
167 *
168 * The upper most reserved bit can be used to check if a tag is ddp tag or not:
169 * if the bit is 0, the tag is a valid ddp tag
170 */
171
172/**
173 * cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
174 * @tformat: tag format information
175 * @tag: tag to be checked
176 *
177 * return true if the tag is a ddp tag, false otherwise.
178 */
179static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
180{
181 return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
182}
183
184/**
185 * cxgb3i_sw_tag_usable - check if a given s/w tag has enough bits left for
186 * the reserved/hw bits
187 * @tformat: tag format information
188 * @sw_tag: s/w tag to be checked
189 *
190 * return true if the tag is a ddp tag, false otherwise.
191 */
192static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
193 u32 sw_tag)
194{
195 sw_tag >>= (32 - tformat->rsvd_bits);
196 return !sw_tag;
197}
198
199/**
200 * cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
201 * @tformat: tag format information
202 * @sw_tag: s/w tag to be checked
203 *
204 * insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
205 */
206static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
207 u32 sw_tag)
208{
209 unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
210 u32 mask = (1 << shift) - 1;
211
212 if (sw_tag && (sw_tag & ~mask)) {
213 u32 v1 = sw_tag & ((1 << shift) - 1);
214 u32 v2 = (sw_tag >> (shift - 1)) << shift;
215
216 return v2 | v1 | 1 << shift;
217 }
218 return sw_tag | 1 << shift;
219}
220
221/**
222 * cxgb3i_ddp_tag_base - shift the s/w tag bits so that reserved bits are not
223 * used.
224 * @tformat: tag format information
225 * @sw_tag: s/w tag to be checked
226 */
227static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
228 u32 sw_tag)
229{
230 u32 mask = (1 << tformat->rsvd_shift) - 1;
231
232 if (sw_tag && (sw_tag & ~mask)) {
233 u32 v1 = sw_tag & mask;
234 u32 v2 = sw_tag >> tformat->rsvd_shift;
235
236 v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
237 return v2 | v1;
238 }
239 return sw_tag;
240}
241
242/**
243 * cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
244 * @tformat: tag format information
245 * @tag: tag to be checked
246 *
247 * return the reserved bits in the tag
248 */
249static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
250 u32 tag)
251{
252 if (cxgb3i_is_ddp_tag(tformat, tag))
253 return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
254 return 0;
255}
256
257/**
258 * cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
259 * @tformat: tag format information
260 * @tag: tag to be checked
261 *
262 * return the non-reserved bits in the tag.
263 */
264static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
265 u32 tag)
266{
267 unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
268 u32 v1, v2;
269
270 if (cxgb3i_is_ddp_tag(tformat, tag)) {
271 v1 = tag & ((1 << tformat->rsvd_shift) - 1);
272 v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
273 } else {
274 u32 mask = (1 << shift) - 1;
275
276 tag &= ~(1 << shift);
277 v1 = tag & mask;
278 v2 = (tag >> 1) & ~mask;
279 }
280 return v1 | v2;
281}
282
283int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
284 struct cxgb3i_tag_format *, u32 *tag,
285 struct cxgb3i_gather_list *, gfp_t gfp);
286void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
287
288struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
289 struct scatterlist *sgl,
290 unsigned int sgcnt,
291 struct pci_dev *pdev,
292 gfp_t gfp);
293void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
294 struct pci_dev *pdev);
295
296int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
297 int reply);
298int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
299 unsigned long pgsz);
300int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
301 int hcrc, int dcrc, int reply);
302int cxgb3i_ddp_find_page_index(unsigned long pgsz);
303int cxgb3i_adapter_ddp_init(struct t3cdev *, struct cxgb3i_tag_format *,
304 unsigned int *txsz, unsigned int *rxsz);
305void cxgb3i_adapter_ddp_cleanup(struct t3cdev *);
306#endif
diff --git a/drivers/scsi/cxgb3i/cxgb3i_init.c b/drivers/scsi/cxgb3i/cxgb3i_init.c
new file mode 100644
index 000000000000..091ecb4d9f3d
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_init.c
@@ -0,0 +1,107 @@
1/* cxgb3i_init.c: Chelsio S3xx iSCSI driver.
2 *
3 * Copyright (c) 2008 Chelsio Communications, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation.
8 *
9 * Written by: Karen Xie (kxie@chelsio.com)
10 */
11
12#include "cxgb3i.h"
13
14#define DRV_MODULE_NAME "cxgb3i"
15#define DRV_MODULE_VERSION "1.0.0"
16#define DRV_MODULE_RELDATE "Jun. 1, 2008"
17
18static char version[] =
19 "Chelsio S3xx iSCSI Driver " DRV_MODULE_NAME
20 " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
21
22MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
23MODULE_DESCRIPTION("Chelsio S3xx iSCSI Driver");
24MODULE_LICENSE("GPL");
25MODULE_VERSION(DRV_MODULE_VERSION);
26
27static void open_s3_dev(struct t3cdev *);
28static void close_s3_dev(struct t3cdev *);
29
30static cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
31static struct cxgb3_client t3c_client = {
32 .name = "iscsi_cxgb3",
33 .handlers = cxgb3i_cpl_handlers,
34 .add = open_s3_dev,
35 .remove = close_s3_dev,
36};
37
38/**
39 * open_s3_dev - register with cxgb3 LLD
40 * @t3dev: cxgb3 adapter instance
41 */
42static void open_s3_dev(struct t3cdev *t3dev)
43{
44 static int vers_printed;
45
46 if (!vers_printed) {
47 printk(KERN_INFO "%s", version);
48 vers_printed = 1;
49 }
50
51 cxgb3i_sdev_add(t3dev, &t3c_client);
52 cxgb3i_adapter_add(t3dev);
53}
54
55/**
56 * close_s3_dev - de-register with cxgb3 LLD
57 * @t3dev: cxgb3 adapter instance
58 */
59static void close_s3_dev(struct t3cdev *t3dev)
60{
61 cxgb3i_adapter_remove(t3dev);
62 cxgb3i_sdev_remove(t3dev);
63}
64
65/**
66 * cxgb3i_init_module - module init entry point
67 *
68 * initialize any driver wide global data structures and register itself
69 * with the cxgb3 module
70 */
71static int __init cxgb3i_init_module(void)
72{
73 int err;
74
75 err = cxgb3i_sdev_init(cxgb3i_cpl_handlers);
76 if (err < 0)
77 return err;
78
79 err = cxgb3i_iscsi_init();
80 if (err < 0)
81 return err;
82
83 err = cxgb3i_pdu_init();
84 if (err < 0)
85 return err;
86
87 cxgb3_register_client(&t3c_client);
88
89 return 0;
90}
91
92/**
93 * cxgb3i_exit_module - module cleanup/exit entry point
94 *
95 * go through the driver hba list and for each hba, release any resource held.
96 * and unregisters iscsi transport and the cxgb3 module
97 */
98static void __exit cxgb3i_exit_module(void)
99{
100 cxgb3_unregister_client(&t3c_client);
101 cxgb3i_pdu_cleanup();
102 cxgb3i_iscsi_cleanup();
103 cxgb3i_sdev_cleanup();
104}
105
106module_init(cxgb3i_init_module);
107module_exit(cxgb3i_exit_module);
diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
new file mode 100644
index 000000000000..d83464b9b3f9
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -0,0 +1,951 @@
1/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
2 *
3 * Copyright (c) 2008 Chelsio Communications, Inc.
4 * Copyright (c) 2008 Mike Christie
5 * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation.
10 *
11 * Written by: Karen Xie (kxie@chelsio.com)
12 */
13
14#include <linux/inet.h>
15#include <linux/crypto.h>
16#include <net/tcp.h>
17#include <scsi/scsi_cmnd.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_eh.h>
20#include <scsi/scsi_host.h>
21#include <scsi/scsi.h>
22#include <scsi/iscsi_proto.h>
23#include <scsi/libiscsi.h>
24#include <scsi/scsi_transport_iscsi.h>
25
26#include "cxgb3i.h"
27#include "cxgb3i_pdu.h"
28
29#ifdef __DEBUG_CXGB3I_TAG__
30#define cxgb3i_tag_debug cxgb3i_log_debug
31#else
32#define cxgb3i_tag_debug(fmt...)
33#endif
34
35#ifdef __DEBUG_CXGB3I_API__
36#define cxgb3i_api_debug cxgb3i_log_debug
37#else
38#define cxgb3i_api_debug(fmt...)
39#endif
40
41/*
42 * align pdu size to multiple of 512 for better performance
43 */
44#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
45
46static struct scsi_transport_template *cxgb3i_scsi_transport;
47static struct scsi_host_template cxgb3i_host_template;
48static struct iscsi_transport cxgb3i_iscsi_transport;
49static unsigned char sw_tag_idx_bits;
50static unsigned char sw_tag_age_bits;
51
52static LIST_HEAD(cxgb3i_snic_list);
53static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
54
55/**
56 * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
57 * @t3dev: t3cdev adapter
58 * return the resulting cxgb3i_adapter struct
59 */
60struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
61{
62 struct cxgb3i_adapter *snic;
63 struct adapter *adapter = tdev2adap(t3dev);
64 int i;
65
66 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
67 if (!snic) {
68 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
69 return NULL;
70 }
71 spin_lock_init(&snic->lock);
72
73 snic->tdev = t3dev;
74 snic->pdev = adapter->pdev;
75 snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
76
77 if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
78 &snic->tx_max_size,
79 &snic->rx_max_size) < 0)
80 goto free_snic;
81
82 for_each_port(adapter, i) {
83 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
84 if (!snic->hba[i])
85 goto ulp_cleanup;
86 }
87 snic->hba_cnt = adapter->params.nports;
88
89 /* add to the list */
90 write_lock(&cxgb3i_snic_rwlock);
91 list_add_tail(&snic->list_head, &cxgb3i_snic_list);
92 write_unlock(&cxgb3i_snic_rwlock);
93
94 return snic;
95
96ulp_cleanup:
97 cxgb3i_adapter_ddp_cleanup(t3dev);
98free_snic:
99 kfree(snic);
100 return NULL;
101}
102
103/**
104 * cxgb3i_adapter_remove - release all the resources held and cleanup any
105 * h/w settings
106 * @t3dev: t3cdev adapter
107 */
108void cxgb3i_adapter_remove(struct t3cdev *t3dev)
109{
110 int i;
111 struct cxgb3i_adapter *snic;
112
113 /* remove from the list */
114 write_lock(&cxgb3i_snic_rwlock);
115 list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
116 if (snic->tdev == t3dev) {
117 list_del(&snic->list_head);
118 break;
119 }
120 }
121 write_unlock(&cxgb3i_snic_rwlock);
122
123 if (snic) {
124 for (i = 0; i < snic->hba_cnt; i++) {
125 if (snic->hba[i]) {
126 cxgb3i_hba_host_remove(snic->hba[i]);
127 snic->hba[i] = NULL;
128 }
129 }
130
131 /* release ddp resources */
132 cxgb3i_adapter_ddp_cleanup(snic->tdev);
133 kfree(snic);
134 }
135}
136
137/**
138 * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
139 * net_device
140 * @t3dev: t3cdev adapter
141 */
142struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
143{
144 struct cxgb3i_adapter *snic;
145 int i;
146
147 read_lock(&cxgb3i_snic_rwlock);
148 list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
149 for (i = 0; i < snic->hba_cnt; i++) {
150 if (snic->hba[i]->ndev == ndev) {
151 read_unlock(&cxgb3i_snic_rwlock);
152 return snic->hba[i];
153 }
154 }
155 }
156 read_unlock(&cxgb3i_snic_rwlock);
157 return NULL;
158}
159
160/**
161 * cxgb3i_hba_host_add - register a new host with scsi/iscsi
162 * @snic: the cxgb3i adapter
163 * @ndev: associated net_device
164 */
165struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
166 struct net_device *ndev)
167{
168 struct cxgb3i_hba *hba;
169 struct Scsi_Host *shost;
170 int err;
171
172 shost = iscsi_host_alloc(&cxgb3i_host_template,
173 sizeof(struct cxgb3i_hba),
174 CXGB3I_SCSI_QDEPTH_DFLT);
175 if (!shost) {
176 cxgb3i_log_info("iscsi_host_alloc failed.\n");
177 return NULL;
178 }
179
180 shost->transportt = cxgb3i_scsi_transport;
181 shost->max_lun = CXGB3I_MAX_LUN;
182 shost->max_id = CXGB3I_MAX_TARGET;
183 shost->max_channel = 0;
184 shost->max_cmd_len = 16;
185
186 hba = iscsi_host_priv(shost);
187 hba->snic = snic;
188 hba->ndev = ndev;
189 hba->shost = shost;
190
191 pci_dev_get(snic->pdev);
192 err = iscsi_host_add(shost, &snic->pdev->dev);
193 if (err) {
194 cxgb3i_log_info("iscsi_host_add failed.\n");
195 goto pci_dev_put;
196 }
197
198 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
199 shost, hba, shost->host_no);
200
201 return hba;
202
203pci_dev_put:
204 pci_dev_put(snic->pdev);
205 scsi_host_put(shost);
206 return NULL;
207}
208
209/**
210 * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
211 * @hba: the cxgb3i hba
212 */
213void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
214{
215 cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
216 hba->shost, hba, hba->shost->host_no);
217 iscsi_host_remove(hba->shost);
218 pci_dev_put(hba->snic->pdev);
219 iscsi_host_free(hba->shost);
220}
221
222/**
223 * cxgb3i_ep_connect - establish TCP connection to target portal
224 * @dst_addr: target IP address
225 * @non_blocking: blocking or non-blocking call
226 *
227 * Initiates a TCP/IP connection to the dst_addr
228 */
229static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
230 int non_blocking)
231{
232 struct iscsi_endpoint *ep;
233 struct cxgb3i_endpoint *cep;
234 struct cxgb3i_hba *hba;
235 struct s3_conn *c3cn = NULL;
236 int err = 0;
237
238 c3cn = cxgb3i_c3cn_create();
239 if (!c3cn) {
240 cxgb3i_log_info("ep connect OOM.\n");
241 err = -ENOMEM;
242 goto release_conn;
243 }
244
245 err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
246 if (err < 0) {
247 cxgb3i_log_info("ep connect failed.\n");
248 goto release_conn;
249 }
250 hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
251 if (!hba) {
252 err = -ENOSPC;
253 cxgb3i_log_info("NOT going through cxgbi device.\n");
254 goto release_conn;
255 }
256 if (c3cn_is_closing(c3cn)) {
257 err = -ENOSPC;
258 cxgb3i_log_info("ep connect unable to connect.\n");
259 goto release_conn;
260 }
261
262 ep = iscsi_create_endpoint(sizeof(*cep));
263 if (!ep) {
264 err = -ENOMEM;
265 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
266 goto release_conn;
267 }
268 cep = ep->dd_data;
269 cep->c3cn = c3cn;
270 cep->hba = hba;
271
272 cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
273 ep, cep, c3cn, hba);
274 return ep;
275
276release_conn:
277 cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
278 if (c3cn)
279 cxgb3i_c3cn_release(c3cn);
280 return ERR_PTR(err);
281}
282
283/**
284 * cxgb3i_ep_poll - polls for TCP connection establishement
285 * @ep: TCP connection (endpoint) handle
286 * @timeout_ms: timeout value in milli secs
287 *
288 * polls for TCP connect request to complete
289 */
290static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
291{
292 struct cxgb3i_endpoint *cep = ep->dd_data;
293 struct s3_conn *c3cn = cep->c3cn;
294
295 if (!c3cn_is_established(c3cn))
296 return 0;
297 cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
298 return 1;
299}
300
301/**
302 * cxgb3i_ep_disconnect - teardown TCP connection
303 * @ep: TCP connection (endpoint) handle
304 *
305 * teardown TCP connection
306 */
307static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
308{
309 struct cxgb3i_endpoint *cep = ep->dd_data;
310 struct cxgb3i_conn *cconn = cep->cconn;
311
312 cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
313
314 if (cconn && cconn->conn) {
315 /*
316 * stop the xmit path so the xmit_pdu function is
317 * not being called
318 */
319 iscsi_suspend_tx(cconn->conn);
320
321 write_lock_bh(&cep->c3cn->callback_lock);
322 cep->c3cn->user_data = NULL;
323 cconn->cep = NULL;
324 write_unlock_bh(&cep->c3cn->callback_lock);
325 }
326
327 cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
328 ep, cep, cep->c3cn);
329 cxgb3i_c3cn_release(cep->c3cn);
330 iscsi_destroy_endpoint(ep);
331}
332
333/**
334 * cxgb3i_session_create - create a new iscsi session
335 * @cmds_max: max # of commands
336 * @qdepth: scsi queue depth
337 * @initial_cmdsn: initial iscsi CMDSN for this session
338 * @host_no: pointer to return host no
339 *
340 * Creates a new iSCSI session
341 */
342static struct iscsi_cls_session *
343cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
344 u32 initial_cmdsn, u32 *host_no)
345{
346 struct cxgb3i_endpoint *cep;
347 struct cxgb3i_hba *hba;
348 struct Scsi_Host *shost;
349 struct iscsi_cls_session *cls_session;
350 struct iscsi_session *session;
351
352 if (!ep) {
353 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
354 return NULL;
355 }
356
357 cep = ep->dd_data;
358 hba = cep->hba;
359 shost = hba->shost;
360 cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
361 BUG_ON(hba != iscsi_host_priv(shost));
362
363 *host_no = shost->host_no;
364
365 cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
366 cmds_max,
367 sizeof(struct iscsi_tcp_task),
368 initial_cmdsn, ISCSI_MAX_TARGET);
369 if (!cls_session)
370 return NULL;
371 session = cls_session->dd_data;
372 if (iscsi_tcp_r2tpool_alloc(session))
373 goto remove_session;
374
375 return cls_session;
376
377remove_session:
378 iscsi_session_teardown(cls_session);
379 return NULL;
380}
381
382/**
383 * cxgb3i_session_destroy - destroys iscsi session
384 * @cls_session: pointer to iscsi cls session
385 *
386 * Destroys an iSCSI session instance and releases its all resources held
387 */
388static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
389{
390 cxgb3i_api_debug("sess 0x%p.\n", cls_session);
391 iscsi_tcp_r2tpool_free(cls_session->dd_data);
392 iscsi_session_teardown(cls_session);
393}
394
395/**
396 * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
397 * reduce it to be within the hardware limit if needed
398 * @conn: iscsi connection
399 */
400static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
401
402{
403 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
404 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
405 unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
406 cconn->hba->snic->tx_max_size -
407 ISCSI_PDU_NONPAYLOAD_MAX);
408
409 if (conn->max_xmit_dlength)
410 conn->max_xmit_dlength = min_t(unsigned int,
411 conn->max_xmit_dlength, max);
412 else
413 conn->max_xmit_dlength = max;
414 align_pdu_size(conn->max_xmit_dlength);
415 cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
416 conn, conn->max_xmit_dlength);
417 return 0;
418}
419
420/**
421 * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
422 * the hardware limit
423 * @conn: iscsi connection
424 * return 0 if the value is valid, < 0 otherwise.
425 */
426static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
427{
428 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
429 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
430 unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
431 cconn->hba->snic->rx_max_size -
432 ISCSI_PDU_NONPAYLOAD_MAX);
433
434 align_pdu_size(max);
435 if (conn->max_recv_dlength) {
436 if (conn->max_recv_dlength > max) {
437 cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
438 " Need to be <= %u.\n",
439 conn->max_recv_dlength, max);
440 return -EINVAL;
441 }
442 conn->max_recv_dlength = min_t(unsigned int,
443 conn->max_recv_dlength, max);
444 align_pdu_size(conn->max_recv_dlength);
445 } else
446 conn->max_recv_dlength = max;
447 cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
448 conn, conn->max_recv_dlength);
449 return 0;
450}
451
452/**
453 * cxgb3i_conn_create - create iscsi connection instance
454 * @cls_session: pointer to iscsi cls session
455 * @cid: iscsi cid
456 *
457 * Creates a new iSCSI connection instance for a given session
458 */
459static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
460 *cls_session, u32 cid)
461{
462 struct iscsi_cls_conn *cls_conn;
463 struct iscsi_conn *conn;
464 struct iscsi_tcp_conn *tcp_conn;
465 struct cxgb3i_conn *cconn;
466
467 cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
468
469 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
470 if (!cls_conn)
471 return NULL;
472 conn = cls_conn->dd_data;
473 tcp_conn = conn->dd_data;
474 cconn = tcp_conn->dd_data;
475
476 cconn->conn = conn;
477 return cls_conn;
478}
479
480/**
481 * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
482 * @cls_session: pointer to iscsi cls session
483 * @cls_conn: pointer to iscsi cls conn
484 * @transport_eph: 64-bit EP handle
485 * @is_leading: leading connection on this session?
486 *
487 * Binds together an iSCSI session, an iSCSI connection and a
488 * TCP connection. This routine returns error code if the TCP
489 * connection does not belong on the device iSCSI sess/conn is bound
490 */
491
492static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
493 struct iscsi_cls_conn *cls_conn,
494 u64 transport_eph, int is_leading)
495{
496 struct iscsi_conn *conn = cls_conn->dd_data;
497 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
498 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
499 struct cxgb3i_adapter *snic;
500 struct iscsi_endpoint *ep;
501 struct cxgb3i_endpoint *cep;
502 struct s3_conn *c3cn;
503 int err;
504
505 ep = iscsi_lookup_endpoint(transport_eph);
506 if (!ep)
507 return -EINVAL;
508
509 /* setup ddp pagesize */
510 cep = ep->dd_data;
511 c3cn = cep->c3cn;
512 snic = cep->hba->snic;
513 err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
514 if (err < 0)
515 return err;
516
517 cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
518 ep, cls_session, cls_conn);
519
520 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
521 if (err)
522 return -EINVAL;
523
524 /* calculate the tag idx bits needed for this conn based on cmds_max */
525 cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
526 cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
527 conn->session->cmds_max, cconn->task_idx_bits);
528
529 read_lock(&c3cn->callback_lock);
530 c3cn->user_data = conn;
531 cconn->hba = cep->hba;
532 cconn->cep = cep;
533 cep->cconn = cconn;
534 read_unlock(&c3cn->callback_lock);
535
536 cxgb3i_conn_max_xmit_dlength(conn);
537 cxgb3i_conn_max_recv_dlength(conn);
538
539 spin_lock_bh(&conn->session->lock);
540 sprintf(conn->portal_address, NIPQUAD_FMT,
541 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
542 conn->portal_port = ntohs(c3cn->daddr.sin_port);
543 spin_unlock_bh(&conn->session->lock);
544
545 /* init recv engine */
546 iscsi_tcp_hdr_recv_prep(tcp_conn);
547
548 return 0;
549}
550
551/**
552 * cxgb3i_conn_get_param - return iscsi connection parameter to caller
553 * @cls_conn: pointer to iscsi cls conn
554 * @param: parameter type identifier
555 * @buf: buffer pointer
556 *
557 * returns iSCSI connection parameters
558 */
559static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
560 enum iscsi_param param, char *buf)
561{
562 struct iscsi_conn *conn = cls_conn->dd_data;
563 int len;
564
565 cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
566
567 switch (param) {
568 case ISCSI_PARAM_CONN_PORT:
569 spin_lock_bh(&conn->session->lock);
570 len = sprintf(buf, "%hu\n", conn->portal_port);
571 spin_unlock_bh(&conn->session->lock);
572 break;
573 case ISCSI_PARAM_CONN_ADDRESS:
574 spin_lock_bh(&conn->session->lock);
575 len = sprintf(buf, "%s\n", conn->portal_address);
576 spin_unlock_bh(&conn->session->lock);
577 break;
578 default:
579 return iscsi_conn_get_param(cls_conn, param, buf);
580 }
581
582 return len;
583}
584
585/**
586 * cxgb3i_conn_set_param - set iscsi connection parameter
587 * @cls_conn: pointer to iscsi cls conn
588 * @param: parameter type identifier
589 * @buf: buffer pointer
590 * @buflen: buffer length
591 *
592 * set iSCSI connection parameters
593 */
594static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
595 enum iscsi_param param, char *buf, int buflen)
596{
597 struct iscsi_conn *conn = cls_conn->dd_data;
598 struct iscsi_session *session = conn->session;
599 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
600 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
601 struct cxgb3i_adapter *snic = cconn->hba->snic;
602 struct s3_conn *c3cn = cconn->cep->c3cn;
603 int value, err = 0;
604
605 switch (param) {
606 case ISCSI_PARAM_HDRDGST_EN:
607 err = iscsi_set_param(cls_conn, param, buf, buflen);
608 if (!err && conn->hdrdgst_en)
609 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
610 conn->hdrdgst_en,
611 conn->datadgst_en, 0);
612 break;
613 case ISCSI_PARAM_DATADGST_EN:
614 err = iscsi_set_param(cls_conn, param, buf, buflen);
615 if (!err && conn->datadgst_en)
616 err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
617 conn->hdrdgst_en,
618 conn->datadgst_en, 0);
619 break;
620 case ISCSI_PARAM_MAX_R2T:
621 sscanf(buf, "%d", &value);
622 if (value <= 0 || !is_power_of_2(value))
623 return -EINVAL;
624 if (session->max_r2t == value)
625 break;
626 iscsi_tcp_r2tpool_free(session);
627 err = iscsi_set_param(cls_conn, param, buf, buflen);
628 if (!err && iscsi_tcp_r2tpool_alloc(session))
629 return -ENOMEM;
630 case ISCSI_PARAM_MAX_RECV_DLENGTH:
631 err = iscsi_set_param(cls_conn, param, buf, buflen);
632 if (!err)
633 err = cxgb3i_conn_max_recv_dlength(conn);
634 break;
635 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
636 err = iscsi_set_param(cls_conn, param, buf, buflen);
637 if (!err)
638 err = cxgb3i_conn_max_xmit_dlength(conn);
639 break;
640 default:
641 return iscsi_set_param(cls_conn, param, buf, buflen);
642 }
643 return err;
644}
645
646/**
647 * cxgb3i_host_set_param - configure host (adapter) related parameters
648 * @shost: scsi host pointer
649 * @param: parameter type identifier
650 * @buf: buffer pointer
651 */
652static int cxgb3i_host_set_param(struct Scsi_Host *shost,
653 enum iscsi_host_param param,
654 char *buf, int buflen)
655{
656 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
657
658 cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
659
660 switch (param) {
661 case ISCSI_HOST_PARAM_IPADDRESS:
662 {
663 __be32 addr = in_aton(buf);
664 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
665 return 0;
666 }
667 case ISCSI_HOST_PARAM_HWADDRESS:
668 case ISCSI_HOST_PARAM_NETDEV_NAME:
669 /* ignore */
670 return 0;
671 default:
672 return iscsi_host_set_param(shost, param, buf, buflen);
673 }
674}
675
676/**
677 * cxgb3i_host_get_param - returns host (adapter) related parameters
678 * @shost: scsi host pointer
679 * @param: parameter type identifier
680 * @buf: buffer pointer
681 */
682static int cxgb3i_host_get_param(struct Scsi_Host *shost,
683 enum iscsi_host_param param, char *buf)
684{
685 struct cxgb3i_hba *hba = iscsi_host_priv(shost);
686 int len = 0;
687
688 cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
689
690 switch (param) {
691 case ISCSI_HOST_PARAM_HWADDRESS:
692 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
693 break;
694 case ISCSI_HOST_PARAM_NETDEV_NAME:
695 len = sprintf(buf, "%s\n", hba->ndev->name);
696 break;
697 case ISCSI_HOST_PARAM_IPADDRESS:
698 {
699 __be32 addr;
700
701 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
702 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
703 break;
704 }
705 default:
706 return iscsi_host_get_param(shost, param, buf);
707 }
708 return len;
709}
710
711/**
712 * cxgb3i_conn_get_stats - returns iSCSI stats
713 * @cls_conn: pointer to iscsi cls conn
714 * @stats: pointer to iscsi statistic struct
715 */
716static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
717 struct iscsi_stats *stats)
718{
719 struct iscsi_conn *conn = cls_conn->dd_data;
720
721 stats->txdata_octets = conn->txdata_octets;
722 stats->rxdata_octets = conn->rxdata_octets;
723 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
724 stats->dataout_pdus = conn->dataout_pdus_cnt;
725 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
726 stats->datain_pdus = conn->datain_pdus_cnt;
727 stats->r2t_pdus = conn->r2t_pdus_cnt;
728 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
729 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
730 stats->digest_err = 0;
731 stats->timeout_err = 0;
732 stats->custom_length = 1;
733 strcpy(stats->custom[0].desc, "eh_abort_cnt");
734 stats->custom[0].value = conn->eh_abort_cnt;
735}
736
737/**
738 * cxgb3i_parse_itt - get the idx and age bits from a given tag
739 * @conn: iscsi connection
740 * @itt: itt tag
741 * @idx: task index, filled in by this function
742 * @age: session age, filled in by this function
743 */
744static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
745 int *idx, int *age)
746{
747 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
748 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
749 struct cxgb3i_adapter *snic = cconn->hba->snic;
750 u32 tag = ntohl((__force u32) itt);
751 u32 sw_bits;
752
753 sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
754 if (idx)
755 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
756 if (age)
757 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
758
759 cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
760 tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
761 age ? *age : 0xFF);
762}
763
764/**
765 * cxgb3i_reserve_itt - generate tag for a give task
766 * Try to set up ddp for a scsi read task.
767 * @task: iscsi task
768 * @hdr_itt: tag, filled in by this function
769 */
770int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
771{
772 struct scsi_cmnd *sc = task->sc;
773 struct iscsi_conn *conn = task->conn;
774 struct iscsi_session *sess = conn->session;
775 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
776 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
777 struct cxgb3i_adapter *snic = cconn->hba->snic;
778 struct cxgb3i_tag_format *tformat = &snic->tag_format;
779 u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
780 u32 tag;
781 int err = -EINVAL;
782
783 if (sc &&
784 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
785 cxgb3i_sw_tag_usable(tformat, sw_tag)) {
786 struct s3_conn *c3cn = cconn->cep->c3cn;
787 struct cxgb3i_gather_list *gl;
788
789 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
790 scsi_in(sc)->table.sgl,
791 scsi_in(sc)->table.nents,
792 snic->pdev,
793 GFP_ATOMIC);
794 if (gl) {
795 tag = sw_tag;
796 err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
797 tformat, &tag,
798 gl, GFP_ATOMIC);
799 if (err < 0)
800 cxgb3i_ddp_release_gl(gl, snic->pdev);
801 }
802 }
803
804 if (err < 0)
805 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
806 /* the itt need to sent in big-endian order */
807 *hdr_itt = (__force itt_t)htonl(tag);
808
809 cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
810 tag, *hdr_itt, task->itt, sess->age);
811 return 0;
812}
813
814/**
815 * cxgb3i_release_itt - release the tag for a given task
816 * if the tag is a ddp tag, release the ddp setup
817 * @task: iscsi task
818 * @hdr_itt: tag
819 */
820void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
821{
822 struct scsi_cmnd *sc = task->sc;
823 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
824 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
825 struct cxgb3i_adapter *snic = cconn->hba->snic;
826 struct cxgb3i_tag_format *tformat = &snic->tag_format;
827 u32 tag = ntohl((__force u32)hdr_itt);
828
829 cxgb3i_tag_debug("release tag 0x%x.\n", tag);
830
831 if (sc &&
832 (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
833 cxgb3i_is_ddp_tag(tformat, tag))
834 cxgb3i_ddp_tag_release(snic->tdev, tag);
835}
836
837/**
838 * cxgb3i_host_template -- Scsi_Host_Template structure
839 * used when registering with the scsi mid layer
840 */
841static struct scsi_host_template cxgb3i_host_template = {
842 .module = THIS_MODULE,
843 .name = "Chelsio S3xx iSCSI Initiator",
844 .proc_name = "cxgb3i",
845 .queuecommand = iscsi_queuecommand,
846 .change_queue_depth = iscsi_change_queue_depth,
847 .can_queue = 128 * (ISCSI_DEF_XMIT_CMDS_MAX - 1),
848 .sg_tablesize = SG_ALL,
849 .max_sectors = 0xFFFF,
850 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
851 .eh_abort_handler = iscsi_eh_abort,
852 .eh_device_reset_handler = iscsi_eh_device_reset,
853 .eh_target_reset_handler = iscsi_eh_target_reset,
854 .use_clustering = DISABLE_CLUSTERING,
855 .this_id = -1,
856};
857
858static struct iscsi_transport cxgb3i_iscsi_transport = {
859 .owner = THIS_MODULE,
860 .name = "cxgb3i",
861 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
862 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
863 CAP_PADDING_OFFLOAD,
864 .param_mask = ISCSI_MAX_RECV_DLENGTH |
865 ISCSI_MAX_XMIT_DLENGTH |
866 ISCSI_HDRDGST_EN |
867 ISCSI_DATADGST_EN |
868 ISCSI_INITIAL_R2T_EN |
869 ISCSI_MAX_R2T |
870 ISCSI_IMM_DATA_EN |
871 ISCSI_FIRST_BURST |
872 ISCSI_MAX_BURST |
873 ISCSI_PDU_INORDER_EN |
874 ISCSI_DATASEQ_INORDER_EN |
875 ISCSI_ERL |
876 ISCSI_CONN_PORT |
877 ISCSI_CONN_ADDRESS |
878 ISCSI_EXP_STATSN |
879 ISCSI_PERSISTENT_PORT |
880 ISCSI_PERSISTENT_ADDRESS |
881 ISCSI_TARGET_NAME | ISCSI_TPGT |
882 ISCSI_USERNAME | ISCSI_PASSWORD |
883 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
884 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
885 ISCSI_LU_RESET_TMO |
886 ISCSI_PING_TMO | ISCSI_RECV_TMO |
887 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
888 .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
889 ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
890 .get_host_param = cxgb3i_host_get_param,
891 .set_host_param = cxgb3i_host_set_param,
892 /* session management */
893 .create_session = cxgb3i_session_create,
894 .destroy_session = cxgb3i_session_destroy,
895 .get_session_param = iscsi_session_get_param,
896 /* connection management */
897 .create_conn = cxgb3i_conn_create,
898 .bind_conn = cxgb3i_conn_bind,
899 .destroy_conn = iscsi_tcp_conn_teardown,
900 .start_conn = iscsi_conn_start,
901 .stop_conn = iscsi_conn_stop,
902 .get_conn_param = cxgb3i_conn_get_param,
903 .set_param = cxgb3i_conn_set_param,
904 .get_stats = cxgb3i_conn_get_stats,
905 /* pdu xmit req. from user space */
906 .send_pdu = iscsi_conn_send_pdu,
907 /* task */
908 .init_task = iscsi_tcp_task_init,
909 .xmit_task = iscsi_tcp_task_xmit,
910 .cleanup_task = cxgb3i_conn_cleanup_task,
911
912 /* pdu */
913 .alloc_pdu = cxgb3i_conn_alloc_pdu,
914 .init_pdu = cxgb3i_conn_init_pdu,
915 .xmit_pdu = cxgb3i_conn_xmit_pdu,
916 .parse_pdu_itt = cxgb3i_parse_itt,
917
918 /* TCP connect/disconnect */
919 .ep_connect = cxgb3i_ep_connect,
920 .ep_poll = cxgb3i_ep_poll,
921 .ep_disconnect = cxgb3i_ep_disconnect,
922 /* Error recovery timeout call */
923 .session_recovery_timedout = iscsi_session_recovery_timedout,
924};
925
926int cxgb3i_iscsi_init(void)
927{
928 sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
929 sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
930 cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
931 ISCSI_ITT_MASK, sw_tag_idx_bits,
932 ISCSI_AGE_MASK, sw_tag_age_bits);
933
934 cxgb3i_scsi_transport =
935 iscsi_register_transport(&cxgb3i_iscsi_transport);
936 if (!cxgb3i_scsi_transport) {
937 cxgb3i_log_error("Could not register cxgb3i transport.\n");
938 return -ENODEV;
939 }
940 cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
941 return 0;
942}
943
944void cxgb3i_iscsi_cleanup(void)
945{
946 if (cxgb3i_scsi_transport) {
947 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
948 cxgb3i_scsi_transport);
949 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
950 }
951}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c
new file mode 100644
index 000000000000..5f16081b68d5
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.c
@@ -0,0 +1,1810 @@
1/*
2 * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
3 *
4 * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
5 *
6 * This program is distributed in the hope that it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
9 * release for licensing terms and conditions.
10 *
11 * Written by: Dimitris Michailidis (dm@chelsio.com)
12 * Karen Xie (kxie@chelsio.com)
13 */
14
15#include <linux/if_vlan.h>
16#include <linux/version.h>
17
18#include "cxgb3_defs.h"
19#include "cxgb3_ctl_defs.h"
20#include "firmware_exports.h"
21#include "cxgb3i_offload.h"
22#include "cxgb3i_pdu.h"
23#include "cxgb3i_ddp.h"
24
25#ifdef __DEBUG_C3CN_CONN__
26#define c3cn_conn_debug cxgb3i_log_info
27#else
28#define c3cn_conn_debug(fmt...)
29#endif
30
31#ifdef __DEBUG_C3CN_TX__
32#define c3cn_tx_debug cxgb3i_log_debug
33#else
34#define c3cn_tx_debug(fmt...)
35#endif
36
37#ifdef __DEBUG_C3CN_RX__
38#define c3cn_rx_debug cxgb3i_log_debug
39#else
40#define c3cn_rx_debug(fmt...)
41#endif
42
43/*
44 * module parameters releated to offloaded iscsi connection
45 */
46static int cxgb3_rcv_win = 256 * 1024;
47module_param(cxgb3_rcv_win, int, 0644);
48MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)");
49
50static int cxgb3_snd_win = 64 * 1024;
51module_param(cxgb3_snd_win, int, 0644);
52MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=64KB)");
53
54static int cxgb3_rx_credit_thres = 10 * 1024;
55module_param(cxgb3_rx_credit_thres, int, 0644);
56MODULE_PARM_DESC(rx_credit_thres,
57 "RX credits return threshold in bytes (default=10KB)");
58
59static unsigned int cxgb3_max_connect = 8 * 1024;
60module_param(cxgb3_max_connect, uint, 0644);
61MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)");
62
63static unsigned int cxgb3_sport_base = 20000;
64module_param(cxgb3_sport_base, uint, 0644);
65MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)");
66
67/*
68 * cxgb3i tcp connection data(per adapter) list
69 */
70static LIST_HEAD(cdata_list);
71static DEFINE_RWLOCK(cdata_rwlock);
72
73static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion);
74static void c3cn_release_offload_resources(struct s3_conn *c3cn);
75
76/*
77 * iscsi source port management
78 *
79 * Find a free source port in the port allocation map. We use a very simple
80 * rotor scheme to look for the next free port.
81 *
82 * If a source port has been specified make sure that it doesn't collide with
83 * our normal source port allocation map. If it's outside the range of our
84 * allocation/deallocation scheme just let them use it.
85 *
86 * If the source port is outside our allocation range, the caller is
87 * responsible for keeping track of their port usage.
88 */
89static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
90{
91 unsigned int start;
92 int idx;
93
94 if (!cdata)
95 goto error_out;
96
97 if (c3cn->saddr.sin_port != 0) {
98 idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
99 if (idx < 0 || idx >= cxgb3_max_connect)
100 return 0;
101 if (!test_and_set_bit(idx, cdata->sport_map))
102 return -EADDRINUSE;
103 }
104
105 /* the sport_map_next may not be accurate but that is okay, sport_map
106 should be */
107 start = idx = cdata->sport_map_next;
108 do {
109 if (++idx >= cxgb3_max_connect)
110 idx = 0;
111 if (!(test_and_set_bit(idx, cdata->sport_map))) {
112 c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
113 cdata->sport_map_next = idx;
114 c3cn_conn_debug("%s reserve port %u.\n",
115 cdata->cdev->name,
116 cxgb3_sport_base + idx);
117 return 0;
118 }
119 } while (idx != start);
120
121error_out:
122 return -EADDRNOTAVAIL;
123}
124
125static void c3cn_put_port(struct s3_conn *c3cn)
126{
127 struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
128
129 if (c3cn->saddr.sin_port) {
130 int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
131
132 c3cn->saddr.sin_port = 0;
133 if (idx < 0 || idx >= cxgb3_max_connect)
134 return;
135 clear_bit(idx, cdata->sport_map);
136 c3cn_conn_debug("%s, release port %u.\n",
137 cdata->cdev->name, cxgb3_sport_base + idx);
138 }
139}
140
141static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
142{
143 __set_bit(flag, &c3cn->flags);
144 c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
145 c3cn, flag, c3cn->state, c3cn->flags);
146}
147
148static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
149{
150 __clear_bit(flag, &c3cn->flags);
151 c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
152 c3cn, flag, c3cn->state, c3cn->flags);
153}
154
155static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
156{
157 if (c3cn == NULL)
158 return 0;
159 return test_bit(flag, &c3cn->flags);
160}
161
162static void c3cn_set_state(struct s3_conn *c3cn, int state)
163{
164 c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
165 c3cn->state = state;
166}
167
168static inline void c3cn_hold(struct s3_conn *c3cn)
169{
170 atomic_inc(&c3cn->refcnt);
171}
172
173static inline void c3cn_put(struct s3_conn *c3cn)
174{
175 if (atomic_dec_and_test(&c3cn->refcnt)) {
176 c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
177 c3cn, c3cn->state, c3cn->flags);
178 kfree(c3cn);
179 }
180}
181
182static void c3cn_closed(struct s3_conn *c3cn)
183{
184 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
185 c3cn, c3cn->state, c3cn->flags);
186
187 c3cn_put_port(c3cn);
188 c3cn_release_offload_resources(c3cn);
189 c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
190 cxgb3i_conn_closing(c3cn);
191}
192
193/*
194 * CPL (Chelsio Protocol Language) defines a message passing interface between
195 * the host driver and T3 asic.
196 * The section below implments CPLs that related to iscsi tcp connection
197 * open/close/abort and data send/receive.
198 */
199
200/*
201 * CPL connection active open request: host ->
202 */
203static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
204{
205 int i = 0;
206
207 while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
208 ++i;
209 return i;
210}
211
212static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
213{
214 unsigned int idx;
215 struct dst_entry *dst = c3cn->dst_cache;
216 struct t3cdev *cdev = c3cn->cdev;
217 const struct t3c_data *td = T3C_DATA(cdev);
218 u16 advmss = dst_metric(dst, RTAX_ADVMSS);
219
220 if (advmss > pmtu - 40)
221 advmss = pmtu - 40;
222 if (advmss < td->mtus[0] - 40)
223 advmss = td->mtus[0] - 40;
224 idx = find_best_mtu(td, advmss + 40);
225 return idx;
226}
227
228static inline int compute_wscale(int win)
229{
230 int wscale = 0;
231 while (wscale < 14 && (65535<<wscale) < win)
232 wscale++;
233 return wscale;
234}
235
236static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
237{
238 int wscale = compute_wscale(cxgb3_rcv_win);
239 return V_KEEP_ALIVE(1) |
240 F_TCAM_BYPASS |
241 V_WND_SCALE(wscale) |
242 V_MSS_IDX(c3cn->mss_idx);
243}
244
245static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
246{
247 return V_ULP_MODE(ULP_MODE_ISCSI) |
248 V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
249}
250
251static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
252 unsigned int atid, const struct l2t_entry *e)
253{
254 struct cpl_act_open_req *req;
255
256 c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
257
258 skb->priority = CPL_PRIORITY_SETUP;
259 req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req));
260 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
261 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
262 req->local_port = c3cn->saddr.sin_port;
263 req->peer_port = c3cn->daddr.sin_port;
264 req->local_ip = c3cn->saddr.sin_addr.s_addr;
265 req->peer_ip = c3cn->daddr.sin_addr.s_addr;
266 req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) |
267 V_TX_CHANNEL(e->smt_idx));
268 req->opt0l = htonl(calc_opt0l(c3cn));
269 req->params = 0;
270}
271
272static void fail_act_open(struct s3_conn *c3cn, int errno)
273{
274 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
275 c3cn, c3cn->state, c3cn->flags);
276 c3cn->err = errno;
277 c3cn_closed(c3cn);
278}
279
280static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
281{
282 struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
283
284 c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
285
286 c3cn_hold(c3cn);
287 spin_lock_bh(&c3cn->lock);
288 if (c3cn->state == C3CN_STATE_CONNECTING)
289 fail_act_open(c3cn, EHOSTUNREACH);
290 spin_unlock_bh(&c3cn->lock);
291 c3cn_put(c3cn);
292 __kfree_skb(skb);
293}
294
295/*
296 * CPL connection close request: host ->
297 *
298 * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
299 * the write queue (i.e., after any unsent txt data).
300 */
301static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
302 int flags)
303{
304 CXGB3_SKB_CB(skb)->seq = c3cn->write_seq;
305 CXGB3_SKB_CB(skb)->flags = flags;
306 __skb_queue_tail(&c3cn->write_queue, skb);
307}
308
309static void send_close_req(struct s3_conn *c3cn)
310{
311 struct sk_buff *skb = c3cn->cpl_close;
312 struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
313 unsigned int tid = c3cn->tid;
314
315 c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
316 c3cn, c3cn->state, c3cn->flags);
317
318 c3cn->cpl_close = NULL;
319
320 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
321 req->wr.wr_lo = htonl(V_WR_TID(tid));
322 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
323 req->rsvd = htonl(c3cn->write_seq);
324
325 skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
326 if (c3cn->state != C3CN_STATE_CONNECTING)
327 c3cn_push_tx_frames(c3cn, 1);
328}
329
330/*
331 * CPL connection abort request: host ->
332 *
333 * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
334 * for the same connection and also that we do not try to send a message
335 * after the connection has closed.
336 */
337static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
338{
339 struct cpl_abort_req *req = cplhdr(skb);
340
341 c3cn_conn_debug("tdev 0x%p.\n", cdev);
342
343 req->cmd = CPL_ABORT_NO_RST;
344 cxgb3_ofld_send(cdev, skb);
345}
346
347static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
348{
349 struct sk_buff *skb;
350
351 while ((skb = __skb_dequeue(&c3cn->write_queue)))
352 __kfree_skb(skb);
353}
354
355static void send_abort_req(struct s3_conn *c3cn)
356{
357 struct sk_buff *skb = c3cn->cpl_abort_req;
358 struct cpl_abort_req *req;
359 unsigned int tid = c3cn->tid;
360
361 if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
362 !c3cn->cdev)
363 return;
364
365 c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
366
367 c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
368
369 c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
370
371 /* Purge the send queue so we don't send anything after an abort. */
372 c3cn_purge_write_queue(c3cn);
373
374 c3cn->cpl_abort_req = NULL;
375 req = (struct cpl_abort_req *)skb->head;
376
377 skb->priority = CPL_PRIORITY_DATA;
378 set_arp_failure_handler(skb, abort_arp_failure);
379
380 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
381 req->wr.wr_lo = htonl(V_WR_TID(tid));
382 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
383 req->rsvd0 = htonl(c3cn->snd_nxt);
384 req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT);
385 req->cmd = CPL_ABORT_SEND_RST;
386
387 l2t_send(c3cn->cdev, skb, c3cn->l2t);
388}
389
390/*
391 * CPL connection abort reply: host ->
392 *
393 * Send an ABORT_RPL message in response of the ABORT_REQ received.
394 */
395static void send_abort_rpl(struct s3_conn *c3cn, int rst_status)
396{
397 struct sk_buff *skb = c3cn->cpl_abort_rpl;
398 struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
399
400 c3cn->cpl_abort_rpl = NULL;
401
402 skb->priority = CPL_PRIORITY_DATA;
403 rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
404 rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid));
405 OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid));
406 rpl->cmd = rst_status;
407
408 cxgb3_ofld_send(c3cn->cdev, skb);
409}
410
411/*
412 * CPL connection rx data ack: host ->
413 * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
414 * credits sent.
415 */
416static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
417{
418 struct sk_buff *skb;
419 struct cpl_rx_data_ack *req;
420
421 skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
422 if (!skb)
423 return 0;
424
425 req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req));
426 req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
427 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid));
428 req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
429 skb->priority = CPL_PRIORITY_ACK;
430 cxgb3_ofld_send(c3cn->cdev, skb);
431 return credits;
432}
433
434/*
435 * CPL connection tx data: host ->
436 *
437 * Send iscsi PDU via TX_DATA CPL message. Returns the number of
438 * credits sent.
439 * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
440 * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
441 */
442
443/*
444 * For ULP connections HW may inserts digest bytes into the pdu. Those digest
445 * bytes are not sent by the host but are part of the TCP payload and therefore
446 * consume TCP sequence space.
447 */
448static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
449static inline unsigned int ulp_extra_len(const struct sk_buff *skb)
450{
451 return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
452}
453
454static unsigned int wrlen __read_mostly;
455
456/*
457 * The number of WRs needed for an skb depends on the number of fragments
458 * in the skb and whether it has any payload in its main body. This maps the
459 * length of the gather list represented by an skb into the # of necessary WRs.
460 *
461 * The max. length of an skb is controlled by the max pdu size which is ~16K.
462 * Also, assume the min. fragment length is the sector size (512), then add
463 * extra fragment counts for iscsi bhs and payload padding.
464 */
465#define SKB_WR_LIST_SIZE (16384/512 + 3)
466static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
467
468static void s3_init_wr_tab(unsigned int wr_len)
469{
470 int i;
471
472 if (skb_wrs[1]) /* already initialized */
473 return;
474
475 for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
476 int sgl_len = (3 * i) / 2 + (i & 1);
477
478 sgl_len += 3;
479 skb_wrs[i] = (sgl_len <= wr_len
480 ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
481 }
482
483 wrlen = wr_len * 8;
484}
485
486static inline void reset_wr_list(struct s3_conn *c3cn)
487{
488 c3cn->wr_pending_head = NULL;
489}
490
491/*
492 * Add a WR to a connections's list of pending WRs. This is a singly-linked
493 * list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head
494 * and the tail in wr_pending_tail.
495 */
496static inline void enqueue_wr(struct s3_conn *c3cn,
497 struct sk_buff *skb)
498{
499 skb->sp = NULL;
500
501 /*
502 * We want to take an extra reference since both us and the driver
503 * need to free the packet before it's really freed. We know there's
504 * just one user currently so we use atomic_set rather than skb_get
505 * to avoid the atomic op.
506 */
507 atomic_set(&skb->users, 2);
508
509 if (!c3cn->wr_pending_head)
510 c3cn->wr_pending_head = skb;
511 else
512 c3cn->wr_pending_tail->sp = (void *)skb;
513 c3cn->wr_pending_tail = skb;
514}
515
516static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
517{
518 return c3cn->wr_pending_head;
519}
520
521static inline void free_wr_skb(struct sk_buff *skb)
522{
523 kfree_skb(skb);
524}
525
526static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
527{
528 struct sk_buff *skb = c3cn->wr_pending_head;
529
530 if (likely(skb)) {
531 /* Don't bother clearing the tail */
532 c3cn->wr_pending_head = (struct sk_buff *)skb->sp;
533 skb->sp = NULL;
534 }
535 return skb;
536}
537
538static void purge_wr_queue(struct s3_conn *c3cn)
539{
540 struct sk_buff *skb;
541 while ((skb = dequeue_wr(c3cn)) != NULL)
542 free_wr_skb(skb);
543}
544
545static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb,
546 int len)
547{
548 struct tx_data_wr *req;
549
550 skb_reset_transport_header(skb);
551 req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
552 req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA));
553 req->wr_lo = htonl(V_WR_TID(c3cn->tid));
554 req->sndseq = htonl(c3cn->snd_nxt);
555 /* len includes the length of any HW ULP additions */
556 req->len = htonl(len);
557 req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx));
558 /* V_TX_ULP_SUBMODE sets both the mode and submode */
559 req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) |
560 V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1)));
561
562 if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) {
563 req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
564 V_TX_CPU_IDX(c3cn->qset));
565 /* Sendbuffer is in units of 32KB. */
566 req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
567 c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
568 }
569}
570
571/**
572 * c3cn_push_tx_frames -- start transmit
573 * @c3cn: the offloaded connection
574 * @req_completion: request wr_ack or not
575 *
576 * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
577 * connection's send queue and sends them on to T3. Must be called with the
578 * connection's lock held. Returns the amount of send buffer space that was
579 * freed as a result of sending queued data to T3.
580 */
581static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb)
582{
583 kfree_skb(skb);
584}
585
586static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion)
587{
588 int total_size = 0;
589 struct sk_buff *skb;
590 struct t3cdev *cdev;
591 struct cxgb3i_sdev_data *cdata;
592
593 if (unlikely(c3cn->state == C3CN_STATE_CONNECTING ||
594 c3cn->state == C3CN_STATE_CLOSE_WAIT_1 ||
595 c3cn->state == C3CN_STATE_ABORTING)) {
596 c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n",
597 c3cn, c3cn->state);
598 return 0;
599 }
600
601 cdev = c3cn->cdev;
602 cdata = CXGB3_SDEV_DATA(cdev);
603
604 while (c3cn->wr_avail
605 && (skb = skb_peek(&c3cn->write_queue)) != NULL) {
606 int len = skb->len; /* length before skb_push */
607 int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
608 int wrs_needed = skb_wrs[frags];
609
610 if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
611 wrs_needed = 1;
612
613 WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
614
615 if (c3cn->wr_avail < wrs_needed) {
616 c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, "
617 "wr %d < %u.\n",
618 c3cn, skb->len, skb->datalen, frags,
619 wrs_needed, c3cn->wr_avail);
620 break;
621 }
622
623 __skb_unlink(skb, &c3cn->write_queue);
624 skb->priority = CPL_PRIORITY_DATA;
625 skb->csum = wrs_needed; /* remember this until the WR_ACK */
626 c3cn->wr_avail -= wrs_needed;
627 c3cn->wr_unacked += wrs_needed;
628 enqueue_wr(c3cn, skb);
629
630 if (likely(CXGB3_SKB_CB(skb)->flags & C3CB_FLAG_NEED_HDR)) {
631 len += ulp_extra_len(skb);
632 make_tx_data_wr(c3cn, skb, len);
633 c3cn->snd_nxt += len;
634 if ((req_completion
635 && c3cn->wr_unacked == wrs_needed)
636 || (CXGB3_SKB_CB(skb)->flags & C3CB_FLAG_COMPL)
637 || c3cn->wr_unacked >= c3cn->wr_max / 2) {
638 struct work_request_hdr *wr = cplhdr(skb);
639
640 wr->wr_hi |= htonl(F_WR_COMPL);
641 c3cn->wr_unacked = 0;
642 }
643 CXGB3_SKB_CB(skb)->flags &= ~C3CB_FLAG_NEED_HDR;
644 }
645
646 total_size += skb->truesize;
647 set_arp_failure_handler(skb, arp_failure_discard);
648 l2t_send(cdev, skb, c3cn->l2t);
649 }
650 return total_size;
651}
652
653/*
654 * process_cpl_msg: -> host
655 * Top-level CPL message processing used by most CPL messages that
656 * pertain to connections.
657 */
658static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
659 struct sk_buff *),
660 struct s3_conn *c3cn,
661 struct sk_buff *skb)
662{
663 spin_lock_bh(&c3cn->lock);
664 fn(c3cn, skb);
665 spin_unlock_bh(&c3cn->lock);
666}
667
668/*
669 * process_cpl_msg_ref: -> host
670 * Similar to process_cpl_msg() but takes an extra connection reference around
671 * the call to the handler. Should be used if the handler may drop a
672 * connection reference.
673 */
674static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *,
675 struct sk_buff *),
676 struct s3_conn *c3cn,
677 struct sk_buff *skb)
678{
679 c3cn_hold(c3cn);
680 process_cpl_msg(fn, c3cn, skb);
681 c3cn_put(c3cn);
682}
683
684/*
685 * Process a CPL_ACT_ESTABLISH message: -> host
686 * Updates connection state from an active establish CPL message. Runs with
687 * the connection lock held.
688 */
689
690static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid)
691{
692 struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid);
693 if (c3cn)
694 c3cn_put(c3cn);
695}
696
697static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
698 unsigned int opt)
699{
700 c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
701
702 c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
703
704 /*
705 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
706 * pass through opt0.
707 */
708 if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10))
709 c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10);
710
711 dst_confirm(c3cn->dst_cache);
712
713 smp_mb();
714
715 c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
716}
717
718static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
719{
720 struct cpl_act_establish *req = cplhdr(skb);
721 u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
722
723 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
724 c3cn, c3cn->state, c3cn->flags);
725
726 if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
727 cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
728 c3cn->tid, c3cn->state);
729
730 c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
731 c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
732
733 __kfree_skb(skb);
734
735 if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
736 /* upper layer has requested closing */
737 send_abort_req(c3cn);
738 else if (c3cn_push_tx_frames(c3cn, 1))
739 cxgb3i_conn_tx_open(c3cn);
740}
741
742static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
743 void *ctx)
744{
745 struct cpl_act_establish *req = cplhdr(skb);
746 unsigned int tid = GET_TID(req);
747 unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
748 struct s3_conn *c3cn = ctx;
749 struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
750
751 c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
752 tid, c3cn, c3cn->state, c3cn->flags);
753
754 c3cn->tid = tid;
755 c3cn_hold(c3cn);
756 cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
757 s3_free_atid(cdev, atid);
758
759 c3cn->qset = G_QNUM(ntohl(skb->csum));
760
761 process_cpl_msg(process_act_establish, c3cn, skb);
762 return 0;
763}
764
765/*
766 * Process a CPL_ACT_OPEN_RPL message: -> host
767 * Handle active open failures.
768 */
769static int act_open_rpl_status_to_errno(int status)
770{
771 switch (status) {
772 case CPL_ERR_CONN_RESET:
773 return ECONNREFUSED;
774 case CPL_ERR_ARP_MISS:
775 return EHOSTUNREACH;
776 case CPL_ERR_CONN_TIMEDOUT:
777 return ETIMEDOUT;
778 case CPL_ERR_TCAM_FULL:
779 return ENOMEM;
780 case CPL_ERR_CONN_EXIST:
781 cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n");
782 return EADDRINUSE;
783 default:
784 return EIO;
785 }
786}
787
788static void act_open_retry_timer(unsigned long data)
789{
790 struct sk_buff *skb;
791 struct s3_conn *c3cn = (struct s3_conn *)data;
792
793 c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
794
795 spin_lock_bh(&c3cn->lock);
796 skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
797 if (!skb)
798 fail_act_open(c3cn, ENOMEM);
799 else {
800 skb->sk = (struct sock *)c3cn;
801 set_arp_failure_handler(skb, act_open_req_arp_failure);
802 make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
803 l2t_send(c3cn->cdev, skb, c3cn->l2t);
804 }
805 spin_unlock_bh(&c3cn->lock);
806 c3cn_put(c3cn);
807}
808
809static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
810{
811 struct cpl_act_open_rpl *rpl = cplhdr(skb);
812
813 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
814 c3cn, c3cn->state, c3cn->flags);
815
816 if (rpl->status == CPL_ERR_CONN_EXIST &&
817 c3cn->retry_timer.function != act_open_retry_timer) {
818 c3cn->retry_timer.function = act_open_retry_timer;
819 if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2))
820 c3cn_hold(c3cn);
821 } else
822 fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
823 __kfree_skb(skb);
824}
825
826static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
827{
828 struct s3_conn *c3cn = ctx;
829 struct cpl_act_open_rpl *rpl = cplhdr(skb);
830
831 c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
832 rpl->status, c3cn, c3cn->state, c3cn->flags);
833
834 if (rpl->status != CPL_ERR_TCAM_FULL &&
835 rpl->status != CPL_ERR_CONN_EXIST &&
836 rpl->status != CPL_ERR_ARP_MISS)
837 cxgb3_queue_tid_release(cdev, GET_TID(rpl));
838
839 process_cpl_msg_ref(process_act_open_rpl, c3cn, skb);
840 return 0;
841}
842
843/*
844 * Process PEER_CLOSE CPL messages: -> host
845 * Handle peer FIN.
846 */
847static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
848{
849 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
850 c3cn, c3cn->state, c3cn->flags);
851
852 if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
853 goto out;
854
855 switch (c3cn->state) {
856 case C3CN_STATE_ESTABLISHED:
857 c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE);
858 break;
859 case C3CN_STATE_ACTIVE_CLOSE:
860 c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
861 break;
862 case C3CN_STATE_CLOSE_WAIT_1:
863 c3cn_closed(c3cn);
864 break;
865 case C3CN_STATE_ABORTING:
866 break;
867 default:
868 cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n",
869 c3cn->cdev->name, c3cn->tid, c3cn->state);
870 }
871
872 cxgb3i_conn_closing(c3cn);
873out:
874 __kfree_skb(skb);
875}
876
877static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
878{
879 struct s3_conn *c3cn = ctx;
880
881 c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
882 c3cn, c3cn->state, c3cn->flags);
883 process_cpl_msg_ref(process_peer_close, c3cn, skb);
884 return 0;
885}
886
887/*
888 * Process CLOSE_CONN_RPL CPL message: -> host
889 * Process a peer ACK to our FIN.
890 */
891static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
892{
893 struct cpl_close_con_rpl *rpl = cplhdr(skb);
894
895 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
896 c3cn, c3cn->state, c3cn->flags);
897
898 c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
899
900 if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
901 goto out;
902
903 switch (c3cn->state) {
904 case C3CN_STATE_ACTIVE_CLOSE:
905 c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1);
906 break;
907 case C3CN_STATE_CLOSE_WAIT_1:
908 case C3CN_STATE_CLOSE_WAIT_2:
909 c3cn_closed(c3cn);
910 break;
911 case C3CN_STATE_ABORTING:
912 break;
913 default:
914 cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n",
915 c3cn->cdev->name, c3cn->tid, c3cn->state);
916 }
917
918out:
919 kfree_skb(skb);
920}
921
922static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
923 void *ctx)
924{
925 struct s3_conn *c3cn = ctx;
926
927 c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
928 c3cn, c3cn->state, c3cn->flags);
929
930 process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
931 return 0;
932}
933
934/*
935 * Process ABORT_REQ_RSS CPL message: -> host
936 * Process abort requests. If we are waiting for an ABORT_RPL we ignore this
937 * request except that we need to reply to it.
938 */
939
940static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason,
941 int *need_rst)
942{
943 switch (abort_reason) {
944 case CPL_ERR_BAD_SYN: /* fall through */
945 case CPL_ERR_CONN_RESET:
946 return c3cn->state > C3CN_STATE_ESTABLISHED ?
947 EPIPE : ECONNRESET;
948 case CPL_ERR_XMIT_TIMEDOUT:
949 case CPL_ERR_PERSIST_TIMEDOUT:
950 case CPL_ERR_FINWAIT2_TIMEDOUT:
951 case CPL_ERR_KEEPALIVE_TIMEDOUT:
952 return ETIMEDOUT;
953 default:
954 return EIO;
955 }
956}
957
958static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
959{
960 int rst_status = CPL_ABORT_NO_RST;
961 const struct cpl_abort_req_rss *req = cplhdr(skb);
962
963 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
964 c3cn, c3cn->state, c3cn->flags);
965
966 if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
967 c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
968 c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
969 __kfree_skb(skb);
970 return;
971 }
972
973 c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD);
974 send_abort_rpl(c3cn, rst_status);
975
976 if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
977 c3cn->err =
978 abort_status_to_errno(c3cn, req->status, &rst_status);
979 c3cn_closed(c3cn);
980 }
981}
982
983static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
984{
985 const struct cpl_abort_req_rss *req = cplhdr(skb);
986 struct s3_conn *c3cn = ctx;
987
988 c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
989 c3cn, c3cn->state, c3cn->flags);
990
991 if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
992 req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
993 __kfree_skb(skb);
994 return 0;
995 }
996
997 process_cpl_msg_ref(process_abort_req, c3cn, skb);
998 return 0;
999}
1000
1001/*
1002 * Process ABORT_RPL_RSS CPL message: -> host
1003 * Process abort replies. We only process these messages if we anticipate
1004 * them as the coordination between SW and HW in this area is somewhat lacking
1005 * and sometimes we get ABORT_RPLs after we are done with the connection that
1006 * originated the ABORT_REQ.
1007 */
1008static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
1009{
1010 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
1011 c3cn, c3cn->state, c3cn->flags);
1012
1013 if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
1014 if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD))
1015 c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD);
1016 else {
1017 c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD);
1018 c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING);
1019 if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD))
1020 cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n",
1021 c3cn->cdev->name, c3cn->tid);
1022 c3cn_closed(c3cn);
1023 }
1024 }
1025 __kfree_skb(skb);
1026}
1027
1028static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
1029{
1030 struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
1031 struct s3_conn *c3cn = ctx;
1032
1033 c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n",
1034 rpl->status, c3cn, c3cn ? c3cn->state : 0,
1035 c3cn ? c3cn->flags : 0UL);
1036
1037 /*
1038 * Ignore replies to post-close aborts indicating that the abort was
1039 * requested too late. These connections are terminated when we get
1040 * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
1041 * arrives the TID is either no longer used or it has been recycled.
1042 */
1043 if (rpl->status == CPL_ERR_ABORT_FAILED)
1044 goto discard;
1045
1046 /*
1047 * Sometimes we've already closed the connection, e.g., a post-close
1048 * abort races with ABORT_REQ_RSS, the latter frees the connection
1049 * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
1050 * but FW turns the ABORT_REQ into a regular one and so we get
1051 * ABORT_RPL_RSS with status 0 and no connection.
1052 */
1053 if (!c3cn)
1054 goto discard;
1055
1056 process_cpl_msg_ref(process_abort_rpl, c3cn, skb);
1057 return 0;
1058
1059discard:
1060 __kfree_skb(skb);
1061 return 0;
1062}
1063
1064/*
1065 * Process RX_ISCSI_HDR CPL message: -> host
1066 * Handle received PDUs, the payload could be DDP'ed. If not, the payload
1067 * follow after the bhs.
1068 */
1069static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb)
1070{
1071 struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
1072 struct cpl_iscsi_hdr_norss data_cpl;
1073 struct cpl_rx_data_ddp_norss ddp_cpl;
1074 unsigned int hdr_len, data_len, status;
1075 unsigned int len;
1076 int err;
1077
1078 if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
1079 if (c3cn->state != C3CN_STATE_ABORTING)
1080 send_abort_req(c3cn);
1081 __kfree_skb(skb);
1082 return;
1083 }
1084
1085 CXGB3_SKB_CB(skb)->seq = ntohl(hdr_cpl->seq);
1086 CXGB3_SKB_CB(skb)->flags = 0;
1087
1088 skb_reset_transport_header(skb);
1089 __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
1090
1091 len = hdr_len = ntohs(hdr_cpl->len);
1092 /* msg coalesce is off or not enough data received */
1093 if (skb->len <= hdr_len) {
1094 cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
1095 c3cn->cdev->name, c3cn->tid,
1096 skb->len, hdr_len);
1097 goto abort_conn;
1098 }
1099
1100 err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
1101 sizeof(ddp_cpl));
1102 if (err < 0)
1103 goto abort_conn;
1104
1105 skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY;
1106 skb_ulp_pdulen(skb) = ntohs(ddp_cpl.len);
1107 skb_ulp_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
1108 status = ntohl(ddp_cpl.ddp_status);
1109
1110 c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n",
1111 skb, skb->len, skb_ulp_pdulen(skb), status);
1112
1113 if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT))
1114 skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR;
1115 if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT))
1116 skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR;
1117 if (status & (1 << RX_DDP_STATUS_PAD_SHIFT))
1118 skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR;
1119
1120 if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
1121 err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
1122 if (err < 0)
1123 goto abort_conn;
1124 data_len = ntohs(data_cpl.len);
1125 len += sizeof(data_cpl) + data_len;
1126 } else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT))
1127 skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED;
1128
1129 c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_ulp_pdulen(skb);
1130 __pskb_trim(skb, len);
1131 __skb_queue_tail(&c3cn->receive_queue, skb);
1132 cxgb3i_conn_pdu_ready(c3cn);
1133
1134 return;
1135
1136abort_conn:
1137 send_abort_req(c3cn);
1138 __kfree_skb(skb);
1139}
1140
1141static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
1142{
1143 struct s3_conn *c3cn = ctx;
1144
1145 process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
1146 return 0;
1147}
1148
1149/*
1150 * Process TX_DATA_ACK CPL messages: -> host
1151 * Process an acknowledgment of WR completion. Advance snd_una and send the
1152 * next batch of work requests from the write queue.
1153 */
1154static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
1155{
1156 struct cpl_wr_ack *hdr = cplhdr(skb);
1157 unsigned int credits = ntohs(hdr->credits);
1158 u32 snd_una = ntohl(hdr->snd_una);
1159
1160 c3cn->wr_avail += credits;
1161 if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail)
1162 c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail;
1163
1164 while (credits) {
1165 struct sk_buff *p = peek_wr(c3cn);
1166
1167 if (unlikely(!p)) {
1168 cxgb3i_log_error("%u WR_ACK credits for TID %u with "
1169 "nothing pending, state %u\n",
1170 credits, c3cn->tid, c3cn->state);
1171 break;
1172 }
1173 if (unlikely(credits < p->csum)) {
1174 p->csum -= credits;
1175 break;
1176 } else {
1177 dequeue_wr(c3cn);
1178 credits -= p->csum;
1179 free_wr_skb(p);
1180 }
1181 }
1182
1183 if (unlikely(before(snd_una, c3cn->snd_una)))
1184 goto out_free;
1185
1186 if (c3cn->snd_una != snd_una) {
1187 c3cn->snd_una = snd_una;
1188 dst_confirm(c3cn->dst_cache);
1189 }
1190
1191 if (skb_queue_len(&c3cn->write_queue) && c3cn_push_tx_frames(c3cn, 0))
1192 cxgb3i_conn_tx_open(c3cn);
1193out_free:
1194 __kfree_skb(skb);
1195}
1196
1197static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
1198{
1199 struct s3_conn *c3cn = ctx;
1200
1201 process_cpl_msg(process_wr_ack, c3cn, skb);
1202 return 0;
1203}
1204
1205/*
1206 * for each connection, pre-allocate skbs needed for close/abort requests. So
1207 * that we can service the request right away.
1208 */
1209static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
1210{
1211 if (c3cn->cpl_close)
1212 kfree_skb(c3cn->cpl_close);
1213 if (c3cn->cpl_abort_req)
1214 kfree_skb(c3cn->cpl_abort_req);
1215 if (c3cn->cpl_abort_rpl)
1216 kfree_skb(c3cn->cpl_abort_rpl);
1217}
1218
1219static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn)
1220{
1221 c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req),
1222 GFP_KERNEL);
1223 if (!c3cn->cpl_close)
1224 return -ENOMEM;
1225 skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req));
1226
1227 c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req),
1228 GFP_KERNEL);
1229 if (!c3cn->cpl_abort_req)
1230 goto free_cpl_skbs;
1231 skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req));
1232
1233 c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl),
1234 GFP_KERNEL);
1235 if (!c3cn->cpl_abort_rpl)
1236 goto free_cpl_skbs;
1237 skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl));
1238
1239 return 0;
1240
1241free_cpl_skbs:
1242 c3cn_free_cpl_skbs(c3cn);
1243 return -ENOMEM;
1244}
1245
1246/**
1247 * c3cn_release_offload_resources - release offload resource
1248 * @c3cn: the offloaded iscsi tcp connection.
1249 * Release resources held by an offload connection (TID, L2T entry, etc.)
1250 */
1251static void c3cn_release_offload_resources(struct s3_conn *c3cn)
1252{
1253 struct t3cdev *cdev = c3cn->cdev;
1254 unsigned int tid = c3cn->tid;
1255
1256 if (!cdev)
1257 return;
1258
1259 c3cn->qset = 0;
1260
1261 c3cn_free_cpl_skbs(c3cn);
1262
1263 if (c3cn->wr_avail != c3cn->wr_max) {
1264 purge_wr_queue(c3cn);
1265 reset_wr_list(c3cn);
1266 }
1267
1268 if (c3cn->l2t) {
1269 l2t_release(L2DATA(cdev), c3cn->l2t);
1270 c3cn->l2t = NULL;
1271 }
1272
1273 if (c3cn->state == C3CN_STATE_CONNECTING) /* we have ATID */
1274 s3_free_atid(cdev, tid);
1275 else { /* we have TID */
1276 cxgb3_remove_tid(cdev, (void *)c3cn, tid);
1277 c3cn_put(c3cn);
1278 }
1279
1280 c3cn->cdev = NULL;
1281}
1282
1283/**
1284 * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
1285 * returns the s3_conn structure allocated.
1286 */
1287struct s3_conn *cxgb3i_c3cn_create(void)
1288{
1289 struct s3_conn *c3cn;
1290
1291 c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
1292 if (!c3cn)
1293 return NULL;
1294
1295 /* pre-allocate close/abort cpl, so we don't need to wait for memory
1296 when close/abort is requested. */
1297 if (c3cn_alloc_cpl_skbs(c3cn) < 0)
1298 goto free_c3cn;
1299
1300 c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
1301
1302 c3cn->flags = 0;
1303 spin_lock_init(&c3cn->lock);
1304 atomic_set(&c3cn->refcnt, 1);
1305 skb_queue_head_init(&c3cn->receive_queue);
1306 skb_queue_head_init(&c3cn->write_queue);
1307 setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn);
1308 rwlock_init(&c3cn->callback_lock);
1309
1310 return c3cn;
1311
1312free_c3cn:
1313 kfree(c3cn);
1314 return NULL;
1315}
1316
1317static void c3cn_active_close(struct s3_conn *c3cn)
1318{
1319 int data_lost;
1320 int close_req = 0;
1321
1322 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
1323 c3cn, c3cn->state, c3cn->flags);
1324
1325 dst_confirm(c3cn->dst_cache);
1326
1327 c3cn_hold(c3cn);
1328 spin_lock_bh(&c3cn->lock);
1329
1330 data_lost = skb_queue_len(&c3cn->receive_queue);
1331 __skb_queue_purge(&c3cn->receive_queue);
1332
1333 switch (c3cn->state) {
1334 case C3CN_STATE_CLOSED:
1335 case C3CN_STATE_ACTIVE_CLOSE:
1336 case C3CN_STATE_CLOSE_WAIT_1:
1337 case C3CN_STATE_CLOSE_WAIT_2:
1338 case C3CN_STATE_ABORTING:
1339 /* nothing need to be done */
1340 break;
1341 case C3CN_STATE_CONNECTING:
1342 /* defer until cpl_act_open_rpl or cpl_act_establish */
1343 c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
1344 break;
1345 case C3CN_STATE_ESTABLISHED:
1346 close_req = 1;
1347 c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE);
1348 break;
1349 case C3CN_STATE_PASSIVE_CLOSE:
1350 close_req = 1;
1351 c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
1352 break;
1353 }
1354
1355 if (close_req) {
1356 if (data_lost)
1357 /* Unread data was tossed, zap the connection. */
1358 send_abort_req(c3cn);
1359 else
1360 send_close_req(c3cn);
1361 }
1362
1363 spin_unlock_bh(&c3cn->lock);
1364 c3cn_put(c3cn);
1365}
1366
1367/**
1368 * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
1369 * resource held
1370 * @c3cn: the iscsi tcp connection
1371 */
1372void cxgb3i_c3cn_release(struct s3_conn *c3cn)
1373{
1374 c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
1375 c3cn, c3cn->state, c3cn->flags);
1376 if (likely(c3cn->state != C3CN_STATE_CONNECTING))
1377 c3cn_active_close(c3cn);
1378 else
1379 c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
1380 c3cn_put(c3cn);
1381}
1382
1383static int is_cxgb3_dev(struct net_device *dev)
1384{
1385 struct cxgb3i_sdev_data *cdata;
1386
1387 write_lock(&cdata_rwlock);
1388 list_for_each_entry(cdata, &cdata_list, list) {
1389 struct adap_ports *ports = &cdata->ports;
1390 int i;
1391
1392 for (i = 0; i < ports->nports; i++)
1393 if (dev == ports->lldevs[i]) {
1394 write_unlock(&cdata_rwlock);
1395 return 1;
1396 }
1397 }
1398 write_unlock(&cdata_rwlock);
1399 return 0;
1400}
1401
1402/**
1403 * cxgb3_egress_dev - return the cxgb3 egress device
1404 * @root_dev: the root device anchoring the search
1405 * @c3cn: the connection used to determine egress port in bonding mode
1406 * @context: in bonding mode, indicates a connection set up or failover
1407 *
1408 * Return egress device or NULL if the egress device isn't one of our ports.
1409 */
1410static struct net_device *cxgb3_egress_dev(struct net_device *root_dev,
1411 struct s3_conn *c3cn,
1412 int context)
1413{
1414 while (root_dev) {
1415 if (root_dev->priv_flags & IFF_802_1Q_VLAN)
1416 root_dev = vlan_dev_real_dev(root_dev);
1417 else if (is_cxgb3_dev(root_dev))
1418 return root_dev;
1419 else
1420 return NULL;
1421 }
1422 return NULL;
1423}
1424
1425static struct rtable *find_route(__be32 saddr, __be32 daddr,
1426 __be16 sport, __be16 dport)
1427{
1428 struct rtable *rt;
1429 struct flowi fl = {
1430 .oif = 0,
1431 .nl_u = {
1432 .ip4_u = {
1433 .daddr = daddr,
1434 .saddr = saddr,
1435 .tos = 0 } },
1436 .proto = IPPROTO_TCP,
1437 .uli_u = {
1438 .ports = {
1439 .sport = sport,
1440 .dport = dport } } };
1441
1442 if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
1443 return NULL;
1444 return rt;
1445}
1446
1447/*
1448 * Assign offload parameters to some connection fields.
1449 */
1450static void init_offload_conn(struct s3_conn *c3cn,
1451 struct t3cdev *cdev,
1452 struct dst_entry *dst)
1453{
1454 BUG_ON(c3cn->cdev != cdev);
1455 c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs;
1456 c3cn->wr_unacked = 0;
1457 c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
1458
1459 reset_wr_list(c3cn);
1460}
1461
1462static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev)
1463{
1464 struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
1465 struct t3cdev *cdev = cdata->cdev;
1466 struct dst_entry *dst = c3cn->dst_cache;
1467 struct sk_buff *skb;
1468
1469 c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
1470 c3cn, c3cn->state, c3cn->flags);
1471 /*
1472 * Initialize connection data. Note that the flags and ULP mode are
1473 * initialized higher up ...
1474 */
1475 c3cn->dev = dev;
1476 c3cn->cdev = cdev;
1477 c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn);
1478 if (c3cn->tid < 0)
1479 goto out_err;
1480
1481 c3cn->qset = 0;
1482 c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev);
1483 if (!c3cn->l2t)
1484 goto free_tid;
1485
1486 skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL);
1487 if (!skb)
1488 goto free_l2t;
1489
1490 skb->sk = (struct sock *)c3cn;
1491 set_arp_failure_handler(skb, act_open_req_arp_failure);
1492
1493 c3cn_hold(c3cn);
1494
1495 init_offload_conn(c3cn, cdev, dst);
1496 c3cn->err = 0;
1497
1498 make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
1499 l2t_send(cdev, skb, c3cn->l2t);
1500 return 0;
1501
1502free_l2t:
1503 l2t_release(L2DATA(cdev), c3cn->l2t);
1504free_tid:
1505 s3_free_atid(cdev, c3cn->tid);
1506 c3cn->tid = 0;
1507out_err:
1508 return -1;
1509}
1510
1511
1512/**
1513 * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
1514 * @c3cn: the iscsi tcp connection
1515 * @usin: destination address
1516 *
1517 * return 0 if active open request is sent, < 0 otherwise.
1518 */
1519int cxgb3i_c3cn_connect(struct s3_conn *c3cn, struct sockaddr_in *usin)
1520{
1521 struct rtable *rt;
1522 struct net_device *dev;
1523 struct cxgb3i_sdev_data *cdata;
1524 struct t3cdev *cdev;
1525 __be32 sipv4;
1526 int err;
1527
1528 if (usin->sin_family != AF_INET)
1529 return -EAFNOSUPPORT;
1530
1531 c3cn->daddr.sin_port = usin->sin_port;
1532 c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
1533
1534 rt = find_route(c3cn->saddr.sin_addr.s_addr,
1535 c3cn->daddr.sin_addr.s_addr,
1536 c3cn->saddr.sin_port,
1537 c3cn->daddr.sin_port);
1538 if (rt == NULL) {
1539 c3cn_conn_debug("NO route to 0x%x, port %u.\n",
1540 c3cn->daddr.sin_addr.s_addr,
1541 ntohs(c3cn->daddr.sin_port));
1542 return -ENETUNREACH;
1543 }
1544
1545 if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
1546 c3cn_conn_debug("multi-cast route to 0x%x, port %u.\n",
1547 c3cn->daddr.sin_addr.s_addr,
1548 ntohs(c3cn->daddr.sin_port));
1549 ip_rt_put(rt);
1550 return -ENETUNREACH;
1551 }
1552
1553 if (!c3cn->saddr.sin_addr.s_addr)
1554 c3cn->saddr.sin_addr.s_addr = rt->rt_src;
1555
1556 /* now commit destination to connection */
1557 c3cn->dst_cache = &rt->u.dst;
1558
1559 /* try to establish an offloaded connection */
1560 dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0);
1561 if (dev == NULL) {
1562 c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn);
1563 return -ENETUNREACH;
1564 }
1565 cdata = NDEV2CDATA(dev);
1566 cdev = cdata->cdev;
1567
1568 /* get a source port if one hasn't been provided */
1569 err = c3cn_get_port(c3cn, cdata);
1570 if (err)
1571 return err;
1572
1573 c3cn_conn_debug("c3cn 0x%p get port %u.\n",
1574 c3cn, ntohs(c3cn->saddr.sin_port));
1575
1576 sipv4 = cxgb3i_get_private_ipv4addr(dev);
1577 if (!sipv4) {
1578 c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn);
1579 sipv4 = c3cn->saddr.sin_addr.s_addr;
1580 cxgb3i_set_private_ipv4addr(dev, sipv4);
1581 } else
1582 c3cn->saddr.sin_addr.s_addr = sipv4;
1583
1584 c3cn_conn_debug("c3cn 0x%p, %u.%u.%u.%u,%u-%u.%u.%u.%u,%u SYN_SENT.\n",
1585 c3cn, NIPQUAD(c3cn->saddr.sin_addr.s_addr),
1586 ntohs(c3cn->saddr.sin_port),
1587 NIPQUAD(c3cn->daddr.sin_addr.s_addr),
1588 ntohs(c3cn->daddr.sin_port));
1589
1590 c3cn_set_state(c3cn, C3CN_STATE_CONNECTING);
1591 if (!initiate_act_open(c3cn, dev))
1592 return 0;
1593
1594 /*
1595 * If we get here, we don't have an offload connection so simply
1596 * return a failure.
1597 */
1598 err = -ENOTSUPP;
1599
1600 /*
1601 * This trashes the connection and releases the local port,
1602 * if necessary.
1603 */
1604 c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn);
1605 c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
1606 ip_rt_put(rt);
1607 c3cn_put_port(c3cn);
1608 c3cn->daddr.sin_port = 0;
1609 return err;
1610}
1611
1612/**
1613 * cxgb3i_c3cn_rx_credits - ack received tcp data.
1614 * @c3cn: iscsi tcp connection
1615 * @copied: # of bytes processed
1616 *
1617 * Called after some received data has been read. It returns RX credits
1618 * to the HW for the amount of data processed.
1619 */
1620void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
1621{
1622 struct t3cdev *cdev;
1623 int must_send;
1624 u32 credits, dack = 0;
1625
1626 if (c3cn->state != C3CN_STATE_ESTABLISHED)
1627 return;
1628
1629 credits = c3cn->copied_seq - c3cn->rcv_wup;
1630 if (unlikely(!credits))
1631 return;
1632
1633 cdev = c3cn->cdev;
1634
1635 if (unlikely(cxgb3_rx_credit_thres == 0))
1636 return;
1637
1638 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
1639
1640 /*
1641 * For coalescing to work effectively ensure the receive window has
1642 * at least 16KB left.
1643 */
1644 must_send = credits + 16384 >= cxgb3_rcv_win;
1645
1646 if (must_send || credits >= cxgb3_rx_credit_thres)
1647 c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack);
1648}
1649
1650/**
1651 * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus
1652 * @c3cn: iscsi tcp connection
1653 * @skb: skb contains the iscsi pdu
1654 *
1655 * Add a list of skbs to a connection send queue. The skbs must comply with
1656 * the max size limit of the device and have a headroom of at least
1657 * TX_HEADER_LEN bytes.
1658 * Return # of bytes queued.
1659 */
1660int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
1661{
1662 struct sk_buff *next;
1663 int err, copied = 0;
1664
1665 spin_lock_bh(&c3cn->lock);
1666
1667 if (c3cn->state != C3CN_STATE_ESTABLISHED) {
1668 c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n",
1669 c3cn, c3cn->state);
1670 err = -EAGAIN;
1671 goto out_err;
1672 }
1673
1674 err = -EPIPE;
1675 if (c3cn->err) {
1676 c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
1677 goto out_err;
1678 }
1679
1680 while (skb) {
1681 int frags = skb_shinfo(skb)->nr_frags +
1682 (skb->len != skb->data_len);
1683
1684 if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
1685 c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
1686 err = -EINVAL;
1687 goto out_err;
1688 }
1689
1690 if (frags >= SKB_WR_LIST_SIZE) {
1691 cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n",
1692 c3cn, skb_shinfo(skb)->nr_frags,
1693 skb->len, skb->data_len);
1694 err = -EINVAL;
1695 goto out_err;
1696 }
1697
1698 next = skb->next;
1699 skb->next = NULL;
1700 skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR);
1701 copied += skb->len;
1702 c3cn->write_seq += skb->len + ulp_extra_len(skb);
1703 skb = next;
1704 }
1705done:
1706 if (likely(skb_queue_len(&c3cn->write_queue)))
1707 c3cn_push_tx_frames(c3cn, 1);
1708 spin_unlock_bh(&c3cn->lock);
1709 return copied;
1710
1711out_err:
1712 if (copied == 0 && err == -EPIPE)
1713 copied = c3cn->err ? c3cn->err : -EPIPE;
1714 goto done;
1715}
1716
1717static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
1718{
1719 struct adap_ports *ports = &cdata->ports;
1720 int i;
1721
1722 for (i = 0; i < ports->nports; i++)
1723 NDEV2CDATA(ports->lldevs[i]) = NULL;
1724 cxgb3i_free_big_mem(cdata);
1725}
1726
1727void cxgb3i_sdev_cleanup(void)
1728{
1729 struct cxgb3i_sdev_data *cdata;
1730
1731 write_lock(&cdata_rwlock);
1732 list_for_each_entry(cdata, &cdata_list, list) {
1733 list_del(&cdata->list);
1734 sdev_data_cleanup(cdata);
1735 }
1736 write_unlock(&cdata_rwlock);
1737}
1738
1739int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
1740{
1741 cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish;
1742 cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl;
1743 cpl_handlers[CPL_PEER_CLOSE] = do_peer_close;
1744 cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req;
1745 cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl;
1746 cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl;
1747 cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack;
1748 cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr;
1749
1750 if (cxgb3_max_connect > CXGB3I_MAX_CONN)
1751 cxgb3_max_connect = CXGB3I_MAX_CONN;
1752 return 0;
1753}
1754
1755/**
1756 * cxgb3i_sdev_add - allocate and initialize resources for each adapter found
1757 * @cdev: t3cdev adapter
1758 * @client: cxgb3 driver client
1759 */
1760void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
1761{
1762 struct cxgb3i_sdev_data *cdata;
1763 struct ofld_page_info rx_page_info;
1764 unsigned int wr_len;
1765 int mapsize = DIV_ROUND_UP(cxgb3_max_connect,
1766 8 * sizeof(unsigned long));
1767 int i;
1768
1769 cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
1770 if (!cdata)
1771 return;
1772
1773 if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
1774 cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
1775 cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0)
1776 goto free_cdata;
1777
1778 s3_init_wr_tab(wr_len);
1779
1780 INIT_LIST_HEAD(&cdata->list);
1781 cdata->cdev = cdev;
1782 cdata->client = client;
1783
1784 for (i = 0; i < cdata->ports.nports; i++)
1785 NDEV2CDATA(cdata->ports.lldevs[i]) = cdata;
1786
1787 write_lock(&cdata_rwlock);
1788 list_add_tail(&cdata->list, &cdata_list);
1789 write_unlock(&cdata_rwlock);
1790
1791 return;
1792
1793free_cdata:
1794 cxgb3i_free_big_mem(cdata);
1795}
1796
1797/**
1798 * cxgb3i_sdev_remove - free the allocated resources for the adapter
1799 * @cdev: t3cdev adapter
1800 */
1801void cxgb3i_sdev_remove(struct t3cdev *cdev)
1802{
1803 struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
1804
1805 write_lock(&cdata_rwlock);
1806 list_del(&cdata->list);
1807 write_unlock(&cdata_rwlock);
1808
1809 sdev_data_cleanup(cdata);
1810}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.h b/drivers/scsi/cxgb3i/cxgb3i_offload.h
new file mode 100644
index 000000000000..5b93d629e5c1
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.h
@@ -0,0 +1,231 @@
1/*
2 * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
3 *
4 * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
5 *
6 * This program is distributed in the hope that it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
9 * release for licensing terms and conditions.
10 *
11 * Written by: Dimitris Michailidis (dm@chelsio.com)
12 * Karen Xie (kxie@chelsio.com)
13 */
14
15#ifndef _CXGB3I_OFFLOAD_H
16#define _CXGB3I_OFFLOAD_H
17
18#include <linux/skbuff.h>
19#include <net/tcp.h>
20
21#include "common.h"
22#include "adapter.h"
23#include "t3cdev.h"
24#include "cxgb3_offload.h"
25
26#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
27#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
28#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
29#define cxgb3i_log_debug(fmt, args...) \
30 printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
31
32/**
33 * struct s3_conn - an iscsi tcp connection structure
34 *
35 * @dev: net device of with connection
36 * @cdev: adapter t3cdev for net device
37 * @flags: see c3cn_flags below
38 * @tid: connection id assigned by the h/w
39 * @qset: queue set used by connection
40 * @mss_idx: Maximum Segment Size table index
41 * @l2t: ARP resolution entry for offload packets
42 * @wr_max: maximum in-flight writes
43 * @wr_avail: number of writes available
44 * @wr_unacked: writes since last request for completion notification
45 * @wr_pending_head: head of pending write queue
46 * @wr_pending_tail: tail of pending write queue
47 * @cpl_close: skb for cpl_close_req
48 * @cpl_abort_req: skb for cpl_abort_req
49 * @cpl_abort_rpl: skb for cpl_abort_rpl
50 * @lock: connection status lock
51 * @refcnt: reference count on connection
52 * @state: connection state
53 * @saddr: source ip/port address
54 * @daddr: destination ip/port address
55 * @dst_cache: reference to destination route
56 * @receive_queue: received PDUs
57 * @write_queue: un-pushed pending writes
58 * @retry_timer: retry timer for various operations
59 * @err: connection error status
60 * @callback_lock: lock for opaque user context
61 * @user_data: opaque user context
62 * @rcv_nxt: next receive seq. #
63 * @copied_seq: head of yet unread data
64 * @rcv_wup: rcv_nxt on last window update sent
65 * @snd_nxt: next sequence we send
66 * @snd_una: first byte we want an ack for
67 * @write_seq: tail+1 of data held in send buffer
68 */
69struct s3_conn {
70 struct net_device *dev;
71 struct t3cdev *cdev;
72 unsigned long flags;
73 int tid;
74 int qset;
75 int mss_idx;
76 struct l2t_entry *l2t;
77 int wr_max;
78 int wr_avail;
79 int wr_unacked;
80 struct sk_buff *wr_pending_head;
81 struct sk_buff *wr_pending_tail;
82 struct sk_buff *cpl_close;
83 struct sk_buff *cpl_abort_req;
84 struct sk_buff *cpl_abort_rpl;
85 spinlock_t lock;
86 atomic_t refcnt;
87 volatile unsigned int state;
88 struct sockaddr_in saddr;
89 struct sockaddr_in daddr;
90 struct dst_entry *dst_cache;
91 struct sk_buff_head receive_queue;
92 struct sk_buff_head write_queue;
93 struct timer_list retry_timer;
94 int err;
95 rwlock_t callback_lock;
96 void *user_data;
97
98 u32 rcv_nxt;
99 u32 copied_seq;
100 u32 rcv_wup;
101 u32 snd_nxt;
102 u32 snd_una;
103 u32 write_seq;
104};
105
106/*
107 * connection state
108 */
109enum conn_states {
110 C3CN_STATE_CONNECTING = 1,
111 C3CN_STATE_ESTABLISHED,
112 C3CN_STATE_ACTIVE_CLOSE,
113 C3CN_STATE_PASSIVE_CLOSE,
114 C3CN_STATE_CLOSE_WAIT_1,
115 C3CN_STATE_CLOSE_WAIT_2,
116 C3CN_STATE_ABORTING,
117 C3CN_STATE_CLOSED,
118};
119
120static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
121{
122 return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
123}
124static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
125{
126 return c3cn->state == C3CN_STATE_ESTABLISHED;
127}
128
129/*
130 * Connection flags -- many to track some close related events.
131 */
132enum c3cn_flags {
133 C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
134 C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
135 C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
136 C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
137 C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
138};
139
140/**
141 * cxgb3i_sdev_data - Per adapter data.
142 * Linked off of each Ethernet device port on the adapter.
143 * Also available via the t3cdev structure since we have pointers to our port
144 * net_device's there ...
145 *
146 * @list: list head to link elements
147 * @cdev: t3cdev adapter
148 * @client: CPL client pointer
149 * @ports: array of adapter ports
150 * @sport_map_next: next index into the port map
151 * @sport_map: source port map
152 */
153struct cxgb3i_sdev_data {
154 struct list_head list;
155 struct t3cdev *cdev;
156 struct cxgb3_client *client;
157 struct adap_ports ports;
158 unsigned int sport_map_next;
159 unsigned long sport_map[0];
160};
161#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
162#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
163
164void cxgb3i_sdev_cleanup(void);
165int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
166void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
167void cxgb3i_sdev_remove(struct t3cdev *);
168
169struct s3_conn *cxgb3i_c3cn_create(void);
170int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
171void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
172int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
173void cxgb3i_c3cn_release(struct s3_conn *);
174
175/**
176 * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
177 *
178 * @flag: see C3CB_FLAG_* below
179 * @ulp_mode: ULP mode/submode of sk_buff
180 * @seq: tcp sequence number
181 * @ddigest: pdu data digest
182 * @pdulen: recovered pdu length
183 * @ulp_data: scratch area for ULP
184 */
185struct cxgb3_skb_cb {
186 __u8 flags;
187 __u8 ulp_mode;
188 __u32 seq;
189 __u32 ddigest;
190 __u32 pdulen;
191 __u8 ulp_data[16];
192};
193
194#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
195
196#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
197#define skb_ulp_ddigest(skb) (CXGB3_SKB_CB(skb)->ddigest)
198#define skb_ulp_pdulen(skb) (CXGB3_SKB_CB(skb)->pdulen)
199#define skb_ulp_data(skb) (CXGB3_SKB_CB(skb)->ulp_data)
200
201enum c3cb_flags {
202 C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
203 C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
204 C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
205};
206
207/**
208 * sge_opaque_hdr -
209 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
210 * and for which we must reserve space.
211 */
212struct sge_opaque_hdr {
213 void *dev;
214 dma_addr_t addr[MAX_SKB_FRAGS + 1];
215};
216
217/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
218#define TX_HEADER_LEN \
219 (sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
220
221/*
222 * get and set private ip for iscsi traffic
223 */
224#define cxgb3i_get_private_ipv4addr(ndev) \
225 (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
226#define cxgb3i_set_private_ipv4addr(ndev, addr) \
227 (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
228
229/* max. connections per adapter */
230#define CXGB3I_MAX_CONN 16384
231#endif /* _CXGB3_OFFLOAD_H */
diff --git a/drivers/scsi/cxgb3i/cxgb3i_pdu.c b/drivers/scsi/cxgb3i/cxgb3i_pdu.c
new file mode 100644
index 000000000000..ce7ce8c6094c
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_pdu.c
@@ -0,0 +1,402 @@
1/*
2 * cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 * Copyright (c) 2008 Mike Christie
6 * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
11 *
12 * Written by: Karen Xie (kxie@chelsio.com)
13 */
14
15#include <linux/skbuff.h>
16#include <linux/crypto.h>
17#include <scsi/scsi_cmnd.h>
18#include <scsi/scsi_host.h>
19
20#include "cxgb3i.h"
21#include "cxgb3i_pdu.h"
22
23#ifdef __DEBUG_CXGB3I_RX__
24#define cxgb3i_rx_debug cxgb3i_log_debug
25#else
26#define cxgb3i_rx_debug(fmt...)
27#endif
28
29#ifdef __DEBUG_CXGB3I_TX__
30#define cxgb3i_tx_debug cxgb3i_log_debug
31#else
32#define cxgb3i_tx_debug(fmt...)
33#endif
34
35static struct page *pad_page;
36
37/*
38 * pdu receive, interact with libiscsi_tcp
39 */
40static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
41 unsigned int offset, int offloaded)
42{
43 int status = 0;
44 int bytes_read;
45
46 bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
47 switch (status) {
48 case ISCSI_TCP_CONN_ERR:
49 return -EIO;
50 case ISCSI_TCP_SUSPENDED:
51 /* no transfer - just have caller flush queue */
52 return bytes_read;
53 case ISCSI_TCP_SKB_DONE:
54 /*
55 * pdus should always fit in the skb and we should get
56 * segment done notifcation.
57 */
58 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
59 return -EFAULT;
60 case ISCSI_TCP_SEGMENT_DONE:
61 return bytes_read;
62 default:
63 iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
64 "status %d\n", status);
65 return -EINVAL;
66 }
67}
68
69static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
70 struct sk_buff *skb)
71{
72 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
73 bool offloaded = 0;
74 unsigned int offset;
75 int rc;
76
77 cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
78 conn, skb, skb->len, skb_ulp_mode(skb));
79
80 if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
81 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
82 return -EIO;
83 }
84
85 if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
86 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
87 return -EIO;
88 }
89
90 if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
91 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
92 return -EIO;
93 }
94
95 /* iscsi hdr */
96 rc = read_pdu_skb(conn, skb, 0, 0);
97 if (rc <= 0)
98 return rc;
99
100 if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
101 return 0;
102
103 offset = rc;
104 if (conn->hdrdgst_en)
105 offset += ISCSI_DIGEST_SIZE;
106
107 /* iscsi data */
108 if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
109 cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
110 "itt 0x%x.\n",
111 skb,
112 tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
113 tcp_conn->in.datalen,
114 ntohl(tcp_conn->in.hdr->itt));
115 offloaded = 1;
116 } else {
117 cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
118 "itt 0x%x.\n",
119 skb,
120 tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
121 tcp_conn->in.datalen,
122 ntohl(tcp_conn->in.hdr->itt));
123 offset += sizeof(struct cpl_iscsi_hdr_norss);
124 }
125
126 rc = read_pdu_skb(conn, skb, offset, offloaded);
127 if (rc < 0)
128 return rc;
129 else
130 return 0;
131}
132
133/*
134 * pdu transmit, interact with libiscsi_tcp
135 */
136static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
137{
138 u8 submode = 0;
139
140 if (hcrc)
141 submode |= 1;
142 if (dcrc)
143 submode |= 2;
144 skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
145}
146
147void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
148{
149 struct iscsi_tcp_task *tcp_task = task->dd_data;
150
151 /* never reached the xmit task callout */
152 if (tcp_task->dd_data)
153 kfree_skb(tcp_task->dd_data);
154 tcp_task->dd_data = NULL;
155
156 /* MNC - Do we need a check in case this is called but
157 * cxgb3i_conn_alloc_pdu has never been called on the task */
158 cxgb3i_release_itt(task, task->hdr_itt);
159 iscsi_tcp_cleanup_task(task);
160}
161
162/*
163 * We do not support ahs yet
164 */
165int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
166{
167 struct iscsi_tcp_task *tcp_task = task->dd_data;
168 struct sk_buff *skb;
169
170 task->hdr = NULL;
171 /* always allocate rooms for AHS */
172 skb = alloc_skb(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE +
173 TX_HEADER_LEN, GFP_ATOMIC);
174 if (!skb)
175 return -ENOMEM;
176
177 cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
178 task, opcode, skb);
179
180 tcp_task->dd_data = skb;
181 skb_reserve(skb, TX_HEADER_LEN);
182 task->hdr = (struct iscsi_hdr *)skb->data;
183 task->hdr_max = sizeof(struct iscsi_hdr);
184
185 /* data_out uses scsi_cmd's itt */
186 if (opcode != ISCSI_OP_SCSI_DATA_OUT)
187 cxgb3i_reserve_itt(task, &task->hdr->itt);
188
189 return 0;
190}
191
192int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
193 unsigned int count)
194{
195 struct iscsi_tcp_task *tcp_task = task->dd_data;
196 struct sk_buff *skb = tcp_task->dd_data;
197 struct iscsi_conn *conn = task->conn;
198 struct page *pg;
199 unsigned int datalen = count;
200 int i, padlen = iscsi_padding(count);
201 skb_frag_t *frag;
202
203 cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
204 task, task->sc, offset, count, skb);
205
206 skb_put(skb, task->hdr_len);
207 tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
208 if (!count)
209 return 0;
210
211 if (task->sc) {
212 struct scatterlist *sg;
213 struct scsi_data_buffer *sdb;
214 unsigned int sgoffset = offset;
215 struct page *sgpg;
216 unsigned int sglen;
217
218 sdb = scsi_out(task->sc);
219 sg = sdb->table.sgl;
220
221 for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
222 cxgb3i_tx_debug("sg %d, page 0x%p, len %u offset %u\n",
223 i, sg_page(sg), sg->length, sg->offset);
224
225 if (sgoffset < sg->length)
226 break;
227 sgoffset -= sg->length;
228 }
229 sgpg = sg_page(sg);
230 sglen = sg->length - sgoffset;
231
232 do {
233 int j = skb_shinfo(skb)->nr_frags;
234 unsigned int copy;
235
236 if (!sglen) {
237 sg = sg_next(sg);
238 sgpg = sg_page(sg);
239 sgoffset = 0;
240 sglen = sg->length;
241 ++i;
242 }
243 copy = min(sglen, datalen);
244 if (j && skb_can_coalesce(skb, j, sgpg,
245 sg->offset + sgoffset)) {
246 skb_shinfo(skb)->frags[j - 1].size += copy;
247 } else {
248 get_page(sgpg);
249 skb_fill_page_desc(skb, j, sgpg,
250 sg->offset + sgoffset, copy);
251 }
252 sgoffset += copy;
253 sglen -= copy;
254 datalen -= copy;
255 } while (datalen);
256 } else {
257 pg = virt_to_page(task->data);
258
259 while (datalen) {
260 i = skb_shinfo(skb)->nr_frags;
261 frag = &skb_shinfo(skb)->frags[i];
262
263 get_page(pg);
264 frag->page = pg;
265 frag->page_offset = 0;
266 frag->size = min((unsigned int)PAGE_SIZE, datalen);
267
268 skb_shinfo(skb)->nr_frags++;
269 datalen -= frag->size;
270 pg++;
271 }
272 }
273
274 if (padlen) {
275 i = skb_shinfo(skb)->nr_frags;
276 frag = &skb_shinfo(skb)->frags[i];
277 frag->page = pad_page;
278 frag->page_offset = 0;
279 frag->size = padlen;
280 skb_shinfo(skb)->nr_frags++;
281 }
282
283 datalen = count + padlen;
284 skb->data_len += datalen;
285 skb->truesize += datalen;
286 skb->len += datalen;
287 return 0;
288}
289
290int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
291{
292 struct iscsi_tcp_task *tcp_task = task->dd_data;
293 struct sk_buff *skb = tcp_task->dd_data;
294 struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
295 struct cxgb3i_conn *cconn = tcp_conn->dd_data;
296 unsigned int datalen;
297 int err;
298
299 if (!skb)
300 return 0;
301
302 datalen = skb->data_len;
303 tcp_task->dd_data = NULL;
304 err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
305 cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
306 task, skb, skb->len, skb->data_len, err);
307 if (err > 0) {
308 int pdulen = err;
309
310 if (task->conn->hdrdgst_en)
311 pdulen += ISCSI_DIGEST_SIZE;
312 if (datalen && task->conn->datadgst_en)
313 pdulen += ISCSI_DIGEST_SIZE;
314
315 task->conn->txdata_octets += pdulen;
316 return 0;
317 }
318
319 if (err < 0 && err != -EAGAIN) {
320 kfree_skb(skb);
321 cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
322 task->itt, skb, skb->len, skb->data_len, err);
323 iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
324 iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
325 return err;
326 }
327 /* reset skb to send when we are called again */
328 tcp_task->dd_data = skb;
329 return -EAGAIN;
330}
331
332int cxgb3i_pdu_init(void)
333{
334 pad_page = alloc_page(GFP_KERNEL);
335 if (!pad_page)
336 return -ENOMEM;
337 memset(page_address(pad_page), 0, PAGE_SIZE);
338 return 0;
339}
340
341void cxgb3i_pdu_cleanup(void)
342{
343 if (pad_page) {
344 __free_page(pad_page);
345 pad_page = NULL;
346 }
347}
348
349void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
350{
351 struct sk_buff *skb;
352 unsigned int read = 0;
353 struct iscsi_conn *conn = c3cn->user_data;
354 int err = 0;
355
356 cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
357
358 read_lock(&c3cn->callback_lock);
359 if (unlikely(!conn || conn->suspend_rx)) {
360 cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
361 conn, conn ? conn->id : 0xFF,
362 conn ? conn->suspend_rx : 0xFF);
363 read_unlock(&c3cn->callback_lock);
364 return;
365 }
366 skb = skb_peek(&c3cn->receive_queue);
367 while (!err && skb) {
368 __skb_unlink(skb, &c3cn->receive_queue);
369 read += skb_ulp_pdulen(skb);
370 err = cxgb3i_conn_read_pdu_skb(conn, skb);
371 __kfree_skb(skb);
372 skb = skb_peek(&c3cn->receive_queue);
373 }
374 read_unlock(&c3cn->callback_lock);
375 if (c3cn) {
376 c3cn->copied_seq += read;
377 cxgb3i_c3cn_rx_credits(c3cn, read);
378 }
379 conn->rxdata_octets += read;
380}
381
382void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
383{
384 struct iscsi_conn *conn = c3cn->user_data;
385
386 cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
387 if (conn) {
388 cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
389 scsi_queue_work(conn->session->host, &conn->xmitwork);
390 }
391}
392
393void cxgb3i_conn_closing(struct s3_conn *c3cn)
394{
395 struct iscsi_conn *conn;
396
397 read_lock(&c3cn->callback_lock);
398 conn = c3cn->user_data;
399 if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
400 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
401 read_unlock(&c3cn->callback_lock);
402}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_pdu.h b/drivers/scsi/cxgb3i/cxgb3i_pdu.h
new file mode 100644
index 000000000000..a3f685cc2362
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_pdu.h
@@ -0,0 +1,59 @@
1/*
2 * cxgb3i_ulp2.h: Chelsio S3xx iSCSI driver.
3 *
4 * Copyright (c) 2008 Chelsio Communications, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation.
9 *
10 * Written by: Karen Xie (kxie@chelsio.com)
11 */
12
13#ifndef __CXGB3I_ULP2_PDU_H__
14#define __CXGB3I_ULP2_PDU_H__
15
16struct cpl_iscsi_hdr_norss {
17 union opcode_tid ot;
18 u16 pdu_len_ddp;
19 u16 len;
20 u32 seq;
21 u16 urg;
22 u8 rsvd;
23 u8 status;
24};
25
26struct cpl_rx_data_ddp_norss {
27 union opcode_tid ot;
28 u16 urg;
29 u16 len;
30 u32 seq;
31 u32 nxt_seq;
32 u32 ulp_crc;
33 u32 ddp_status;
34};
35
36#define RX_DDP_STATUS_IPP_SHIFT 27 /* invalid pagepod */
37#define RX_DDP_STATUS_TID_SHIFT 26 /* tid mismatch */
38#define RX_DDP_STATUS_COLOR_SHIFT 25 /* color mismatch */
39#define RX_DDP_STATUS_OFFSET_SHIFT 24 /* offset mismatch */
40#define RX_DDP_STATUS_ULIMIT_SHIFT 23 /* ulimit error */
41#define RX_DDP_STATUS_TAG_SHIFT 22 /* tag mismatch */
42#define RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
43#define RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
44#define RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
45#define RX_DDP_STATUS_PPP_SHIFT 18 /* pagepod parity error */
46#define RX_DDP_STATUS_LLIMIT_SHIFT 17 /* llimit error */
47#define RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
48#define RX_DDP_STATUS_PMM_SHIFT 15 /* pagepod mismatch */
49
50#define ULP2_FLAG_DATA_READY 0x1
51#define ULP2_FLAG_DATA_DDPED 0x2
52#define ULP2_FLAG_HCRC_ERROR 0x10
53#define ULP2_FLAG_DCRC_ERROR 0x20
54#define ULP2_FLAG_PAD_ERROR 0x40
55
56void cxgb3i_conn_closing(struct s3_conn *);
57void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
58void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
59#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-06 14:35:51 -0500