/*
* cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include <linux/skbuff.h>
#include <linux/scatterlist.h>
/* from cxgb3 LLD */
#include "common.h"
#include "t3_cpl.h"
#include "t3cdev.h"
#include "cxgb3_ctl_defs.h"
#include "cxgb3_offload.h"
#include "firmware_exports.h"
#include "cxgb3i_ddp.h"
#define DRV_MODULE_NAME "cxgb3i_ddp"
#define DRV_MODULE_VERSION "1.0.0"
#define DRV_MODULE_RELDATE "Dec. 1, 2008"
static char version[] =
"Chelsio S3xx iSCSI DDP " DRV_MODULE_NAME
" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
MODULE_DESCRIPTION("cxgb3i ddp pagepod manager");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
#define ddp_log_warn(fmt...) printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
#define ddp_log_info(fmt...) printk(KERN_INFO "cxgb3i_ddp: " fmt)
#ifdef __DEBUG_CXGB3I_DDP__
#define ddp_log_debug(fmt, args...) \
printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
#else
#define ddp_log_debug(fmt...)
#endif
/*
* iSCSI Direct Data Placement
*
* T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
* pre-posted final destination host-memory buffers based on the Initiator
* Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
*
* The host memory address is programmed into h/w in the format of pagepod
* entries.
* The location of the pagepod entry is encoded into ddp tag which is used or
* is the base for ITT/TTT.
*/
#define DDP_PGIDX_MAX 4
#define DDP_THRESHOLD 2048
static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
static unsigned char page_idx = DDP_PGIDX_MAX;
static LIST_HEAD(cxgb3i_ddp_list);
static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
/*
* functions to program the pagepod in h/w
*/
static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
{
struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
req->wr.wr_lo = 0;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
V_ULPTX_CMD(ULP_MEM_WRITE));
req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
}
static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
unsigned int idx, unsigned int npods,
struct cxgb3i_gather_list *gl)
{
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
struct pagepod *ppod;
int j, pidx;
/* hold on to the skb until we clear the ddp mapping */
skb_get(skb);
ulp_mem_io_set_hdr(skb, pm_addr);
ppod = (struct pagepod *)
(skb->head + sizeof(struct ulp_mem_io));
memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
ppod->addr[j] = pidx < gl->nelem ?
cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(ddp->tdev, skb);
}
return 0;
}
static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
unsigned int npods)
{
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
int i;
for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
struct sk_buff *skb = ddp->gl_skb[idx];
ddp->gl_skb[idx] = NULL;
memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
ulp_mem_io_set_hdr(skb, pm_addr);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(ddp->tdev, skb);
}
return 0;
}
static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
int start, int max, int count,
struct cxgb3i_gather_list *gl)
{
unsigned int i, j;
spin_lock(&ddp->map_lock);
for (i = start; i <= max;) {
for (j = 0; j < count; j++) {
if (ddp->gl_map[i + j])
break;
}
if (j == count) {
for (j = 0; j < count; j++)
ddp->gl_map[i + j] = gl;
spin_unlock(&ddp->map_lock);
return i;
}
i += j + 1;
}
spin_unlock(&ddp->map_lock);
return -EBUSY;
}
static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
int start, int count)
{
spin_lock(&ddp->map_lock);
memset(&ddp->gl_map[start], 0,
count * sizeof(struct cxgb3i_gather_list *));
spin_unlock(&ddp->map_lock);
}
static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
int idx, int count)
{
int i;
for (i = 0; i < count; i++, idx++)
if (ddp->gl_skb[idx]) {
kfree_skb(ddp->gl_skb[idx]);
ddp->gl_skb[idx] = NULL;
}
}
static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
int count, gfp_t gfp)
{
int i;
for (i = 0; i < count; i++) {
struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
PPOD_SIZE, gfp);
if (skb) {
ddp->gl_skb[idx + i] = skb;
skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
} else {
ddp_free_gl_skb(ddp, idx, i);
return -ENOMEM;
}
}
return 0;
}
/**
* cxgb3i_ddp_find_page_index - return ddp page index for a given page size
* @pgsz: page size
* return the ddp page index, if no match is found return DDP_PGIDX_MAX.
*/
int cxgb3i_ddp_find_page_index(unsigned long pgsz)
{
int i;
for (i = 0; i < DDP_PGIDX_MAX; i++) {
if (pgsz == (1UL << ddp_page_shift[i]))
return i;
}
ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
return DDP_PGIDX_MAX;
}
EXPORT_SYMBOL_GPL(cxgb3i_ddp_find_page_index);
static inline void ddp_gl_unmap(struct pci_dev *pdev,
struct cxgb3i_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++)
pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
PCI_DMA_FROMDEVICE);
}
static inline int ddp_gl_map(struct pci_dev *pdev,
struct cxgb3i_gather_list *gl)
{
int i;
for (i = 0; i < gl->nelem; i++) {
gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
PAGE_SIZE,
PCI_DMA_FROMDEVICE);
if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
goto unmap;
}
return i;
unmap:
if (i) {
unsigned int nelem = gl->nelem;
gl->nelem = i;
ddp_gl_unmap(pdev, gl);
gl->nelem = nelem;
}
return -ENOMEM;
}
/**
* cxgb3i_ddp_make_gl - build ddp page buffer list
* @xferlen: total buffer length
* @sgl: page buffer scatter-gather list
* @sgcnt: # of page buffers
* @pdev: pci_dev, used for pci map
* @gfp: allocation mode
*
* construct a ddp page buffer list from the scsi scattergather list.
* coalesce buffers as much as possible, and obtain dma addresses for
* each page.
*
* Return the cxgb3i_gather_list constructed from the page buffers if the
* memory can be used for ddp. Return NULL otherwise.
*/
struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
struct scatterlist *sgl,
unsigned int sgcnt,
struct pci_dev *pdev,
gfp_t gfp)
{
struct cxgb3i_gather_list *gl;
struct scatterlist *sg = sgl;
struct page *sgpage = sg_page(sg);
unsigned int sglen = sg->length;
unsigned int sgoffset = sg->offset;
unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
PAGE_SHIFT;
int i = 1, j = 0;
if (xferlen < DDP_THRESHOLD) {
ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
xferlen, DDP_THRESHOLD);
return NULL;
}
gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
gfp);
if (!gl)
return NULL;
gl->pages = (struct page **)&gl->phys_addr[npages];
gl->length = xferlen;
gl->offset = sgoffset;
gl->pages[0] = sgpage;
sg = sg_next(sg);
while (sg) {
struct page *page = sg_page(sg);
if (sgpage == page && sg->offset == sgoffset + sglen)
sglen += sg->length;
else {
/* make sure the sgl is fit for ddp:
* each has the same page size, and
* all of the middle pages are used completely
*/
if ((j && sgoffset) ||
((i != sgcnt - 1) &&
((sglen + sgoffset) & ~PAGE_MASK)))
goto error_out;
j++;
if (j == gl->nelem || sg->offset)
goto error_out;
gl->pages[j] = page;
sglen = sg->length;
sgoffset = sg->offset;
sgpage = page;
}
i++;
sg = sg_next(sg);
}
gl->nelem = ++j;
if (ddp_gl_map(pdev, gl) < 0)
goto error_out;
return gl;
error_out:
kfree(gl);
return NULL;
}
EXPORT_SYMBOL_GPL(cxgb3i_ddp_make_gl);
/**
* cxgb3i_ddp_release_gl - release a page buffer list
* @gl: a ddp page buffer list
* @pdev: pci_dev used for pci_unmap
* free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
*/
void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
struct pci_dev *pdev)
{
ddp_gl_unmap(pdev, gl);
kfree(gl);
}
EXPORT_SYMBOL_GPL(cxgb3i_ddp_release_gl);
/**
* cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
* @tdev: t3cdev adapter
* @tid: connection id
* @tformat: tag format
* @tagp: contains s/w tag initially, will be updated with ddp/hw tag
* @gl: the page momory list
* @gfp: allocation mode
*
* ddp setup for a given page buffer list and construct the ddp tag.
* return 0 if success, < 0 otherwise.
*/
int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
struct cxgb3i_tag_format *tformat, u32 *tagp,
struct cxgb3i_gather_list *gl, gfp_t gfp)
{
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
struct pagepod_hdr hdr;
unsigned int npods;
int idx = -1, idx_max;
int err = -ENOMEM;
u32 sw_tag = *tagp;
u32 tag;
if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
gl->length < DDP_THRESHOLD) {
ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
page_idx, gl->length, DDP_THRESHOLD);
return -EINVAL;
}
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
idx_max = ddp->nppods - npods + 1;
if (ddp->idx_last == ddp->nppods)
idx = ddp_find_unused_entries(ddp, 0, idx_max, npods, gl);
else {
idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
idx_max, npods, gl);
if (idx < 0 && ddp->idx_last >= npods)
idx = ddp_find_unused_entries(ddp, 0,
ddp->idx_last - npods + 1,
npods, gl);
}
if (idx < 0) {
ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
gl->length, gl->nelem, npods);
return idx;
}
err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
if (err < 0)
goto unmark_entries;
tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
tag |= idx << PPOD_IDX_SHIFT;
hdr.rsvd = 0;
hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
hdr.maxoffset = htonl(gl->length);
hdr.pgoffset = htonl(gl->offset);
err = set_ddp_map(ddp, &hdr, idx, npods, gl);
if (err < 0)
goto free_gl_skb;
ddp->idx_last = idx;
ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
idx, npods);
*tagp = tag;
return 0;
free_gl_skb:
ddp_free_gl_skb(ddp, idx, npods);
unmark_entries:
ddp_unmark_entries(ddp, idx, npods);
return err;
}
EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_reserve);
/**
* cxgb3i_ddp_tag_release - release a ddp tag
* @tdev: t3cdev adapter
* @tag: ddp tag
* ddp cleanup for a given ddp tag and release all the resources held
*/
void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
{
struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
u32 idx;
if (!ddp) {
ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
return;
}
idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
if (idx < ddp->nppods) {
struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
unsigned int npods;
if (!gl) {
ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
tag, idx);
return;
}
npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
tag, idx, npods);
clear_ddp_map(ddp, idx, npods);
ddp_unmark_entries(ddp, idx, npods);
cxgb3i_ddp_release_gl(gl, ddp->pdev);
} else
ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
tag, idx, ddp->nppods);
}
EXPORT_SYMBOL_GPL(cxgb3i_ddp_tag_release);
static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
int reply)
{
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0xF0000000);
req->val = cpu_to_be64(val << 28);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(tdev, skb);
return 0;
}
/**
* cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
* @tdev: t3cdev adapter
* @tid: connection id
* @reply: request reply from h/w
* set up the ddp page size based on the host PAGE_SIZE for a connection
* identified by tid
*/
int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
int reply)
{
return setup_conn_pgidx(tdev, tid, page_idx, reply);
}
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_host_pagesize);
/**
* cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
* @tdev: t3cdev adapter
* @tid: connection id
* @reply: request reply from h/w
* @pgsz: ddp page size
* set up the ddp page size for a connection identified by tid
*/
int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
int reply, unsigned long pgsz)
{
int pgidx = cxgb3i_ddp_find_page_index(pgsz);
return setup_conn_pgidx(tdev, tid, pgidx, reply);
}
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_pagesize);
/**
* cxgb3i_setup_conn_digest - setup conn. digest setting
* @tdev: t3cdev adapter
* @tid: connection id
* @hcrc: header digest enabled
* @dcrc: data digest enabled
* @reply: request reply from h/w
* set up the iscsi digest settings for a connection identified by tid
*/
int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
int hcrc, int dcrc, int reply)
{
struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
GFP_KERNEL);
struct cpl_set_tcb_field *req;
u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
if (!skb)
return -ENOMEM;
/* set up ulp submode and page size */
req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(reply ? 0 : 1);
req->cpu_idx = 0;
req->word = htons(31);
req->mask = cpu_to_be64(0x0F000000);
req->val = cpu_to_be64(val << 24);
skb->priority = CPL_PRIORITY_CONTROL;
cxgb3_ofld_send(tdev, skb);
return 0;
}
EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
static int ddp_init(struct t3cdev *tdev)
{
struct cxgb3i_ddp_info *ddp;
struct ulp_iscsi_info uinfo;
unsigned int ppmax, bits;
int i, err;
static int vers_printed;
if (!vers_printed) {
printk(KERN_INFO "%s", version);
vers_printed = 1;
}
err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
if (err < 0) {
ddp_log_error("%s, failed to get iscsi param err=%d.\n",
tdev->name, err);
return err;
}
ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
bits = __ilog2_u32(ppmax) + 1;
if (bits > PPOD_IDX_MAX_SIZE)
bits = PPOD_IDX_MAX_SIZE;
ppmax = (1 << (bits - 1)) - 1;
ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
ppmax *
(sizeof(struct cxgb3i_gather_list *) +
sizeof(struct sk_buff *)),
GFP_KERNEL);
if (!ddp) {
ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
tdev->name, ppmax);
return 0;
}
ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
ppmax *
sizeof(struct cxgb3i_gather_list *));
spin_lock_init(&ddp->map_lock);
ddp->tdev = tdev;
ddp->pdev = uinfo.pdev;
ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
ddp->llimit = uinfo.llimit;
ddp->ulimit = uinfo.ulimit;
ddp->nppods = ppmax;
ddp->idx_last = ppmax;
ddp->idx_bits = bits;
ddp->idx_mask = (1 << bits) - 1;
ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
for (i = 0; i < DDP_PGIDX_MAX; i++)
uinfo.pgsz_factor[i] = ddp_page_order[i];
uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
if (err < 0) {
ddp_log_warn("%s unable to set iscsi param err=%d, "
"ddp disabled.\n", tdev->name, err);
goto free_ddp_map;
}
tdev->ulp_iscsi = ddp;
/* add to the list */
write_lock(&cxgb3i_ddp_rwlock);
list_add_tail(&ddp->list, &cxgb3i_ddp_list);
write_unlock(&cxgb3i_ddp_rwlock);
ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
"pkt %u/%u, %u/%u.\n",
ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
ddp->idx_mask, ddp->rsvd_tag_mask,
ddp->max_txsz, uinfo.max_txsz,
ddp->max_rxsz, uinfo.max_rxsz);
return 0;
free_ddp_map:
cxgb3i_free_big_mem(ddp);
return err;
}
/**
* cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
* @tdev: t3cdev adapter
* @tformat: tag format
* @txsz: max tx pdu payload size, filled in by this func.
* @rxsz: max rx pdu payload size, filled in by this func.
* initialize the ddp pagepod manager for a given adapter if needed and
* setup the tag format for a given iscsi entity
*/
int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
struct cxgb3i_tag_format *tformat,
unsigned int *txsz, unsigned int *rxsz)
{
struct cxgb3i_ddp_info *ddp;
unsigned char idx_bits;
if (!tformat)
return -EINVAL;
if (!tdev->ulp_iscsi) {
int err = ddp_init(tdev);
if (err < 0)
return err;
}
ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
idx_bits = 32 - tformat->sw_bits;
tformat->rsvd_bits = ddp->idx_bits;
tformat->rsvd_shift = PPOD_IDX_SHIFT;
tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
tformat->sw_bits, tformat->rsvd_bits,
tformat->rsvd_shift, tformat->rsvd_mask);
*txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
*rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
ddp_log_info("max payload size: %u/%u, %u/%u.\n",
*txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
return 0;
}
EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
static void ddp_release(struct cxgb3i_ddp_info *ddp)
{
int i = 0;
struct t3cdev *tdev = ddp->tdev;
tdev->ulp_iscsi = NULL;
while (i < ddp->nppods) {
struct cxgb3i_gather_list *gl = ddp->gl_map[i];
if (gl) {
int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
>> PPOD_PAGES_SHIFT;
kfree(gl);
ddp_free_gl_skb(ddp, i, npods);
} else
i++;
}
cxgb3i_free_big_mem(ddp);
}
/**
* cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
* @tdev: t3cdev adapter
* release all the resource held by the ddp pagepod manager for a given
* adapter if needed
*/
void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
{
struct cxgb3i_ddp_info *ddp;
/* remove from the list */
write_lock(&cxgb3i_ddp_rwlock);
list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
if (ddp->tdev == tdev) {
list_del(&ddp->list);
break;
}
}
write_unlock(&cxgb3i_ddp_rwlock);
if (ddp)
ddp_release(ddp);
}
EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
/**
* cxgb3i_ddp_init_module - module init entry point
* initialize any driver wide global data structures
*/
static int __init cxgb3i_ddp_init_module(void)
{
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
PAGE_SIZE, page_idx);
return 0;
}
/**
* cxgb3i_ddp_exit_module - module cleanup/exit entry point
* go through the ddp list and release any resource held.
*/
static void __exit cxgb3i_ddp_exit_module(void)
{
struct cxgb3i_ddp_info *ddp;
/* release all ddp manager if there is any */
write_lock(&cxgb3i_ddp_rwlock);
list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
list_del(&ddp->list);
ddp_release(ddp);
}
write_unlock(&cxgb3i_ddp_rwlock);
}
module_init(cxgb3i_ddp_init_module);
module_exit(cxgb3i_ddp_exit_module);
