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Diffstat (limited to 'drivers/net/wireless/ath/wil6210/txrx.c')
-rw-r--r--drivers/net/wireless/ath/wil6210/txrx.c826
1 files changed, 826 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
new file mode 100644
index 000000000000..64b971fdc3cc
--- /dev/null
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -0,0 +1,826 @@
1/*
2 * Copyright (c) 2012 Qualcomm Atheros, Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <linux/kernel.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/hardirq.h>
21#include <net/ieee80211_radiotap.h>
22#include <linux/if_arp.h>
23#include <linux/moduleparam.h>
24
25#include "wil6210.h"
26#include "wmi.h"
27#include "txrx.h"
28
29static bool rtap_include_phy_info;
30module_param(rtap_include_phy_info, bool, S_IRUGO);
31MODULE_PARM_DESC(rtap_include_phy_info,
32 " Include PHY info in the radiotap header, default - no");
33
34static inline int wil_vring_is_empty(struct vring *vring)
35{
36 return vring->swhead == vring->swtail;
37}
38
39static inline u32 wil_vring_next_tail(struct vring *vring)
40{
41 return (vring->swtail + 1) % vring->size;
42}
43
44static inline void wil_vring_advance_head(struct vring *vring, int n)
45{
46 vring->swhead = (vring->swhead + n) % vring->size;
47}
48
49static inline int wil_vring_is_full(struct vring *vring)
50{
51 return wil_vring_next_tail(vring) == vring->swhead;
52}
53/*
54 * Available space in Tx Vring
55 */
56static inline int wil_vring_avail_tx(struct vring *vring)
57{
58 u32 swhead = vring->swhead;
59 u32 swtail = vring->swtail;
60 int used = (vring->size + swhead - swtail) % vring->size;
61
62 return vring->size - used - 1;
63}
64
65static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
66{
67 struct device *dev = wil_to_dev(wil);
68 size_t sz = vring->size * sizeof(vring->va[0]);
69 uint i;
70
71 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
72
73 vring->swhead = 0;
74 vring->swtail = 0;
75 vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL);
76 if (!vring->ctx) {
77 wil_err(wil, "vring_alloc [%d] failed to alloc ctx mem\n",
78 vring->size);
79 vring->va = NULL;
80 return -ENOMEM;
81 }
82 /*
83 * vring->va should be aligned on its size rounded up to power of 2
84 * This is granted by the dma_alloc_coherent
85 */
86 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
87 if (!vring->va) {
88 wil_err(wil, "vring_alloc [%d] failed to alloc DMA mem\n",
89 vring->size);
90 kfree(vring->ctx);
91 vring->ctx = NULL;
92 return -ENOMEM;
93 }
94 /* initially, all descriptors are SW owned
95 * For Tx and Rx, ownership bit is at the same location, thus
96 * we can use any
97 */
98 for (i = 0; i < vring->size; i++) {
99 volatile struct vring_tx_desc *d = &(vring->va[i].tx);
100 d->dma.status = TX_DMA_STATUS_DU;
101 }
102
103 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
104 vring->va, (unsigned long long)vring->pa, vring->ctx);
105
106 return 0;
107}
108
109static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
110 int tx)
111{
112 struct device *dev = wil_to_dev(wil);
113 size_t sz = vring->size * sizeof(vring->va[0]);
114
115 while (!wil_vring_is_empty(vring)) {
116 if (tx) {
117 volatile struct vring_tx_desc *d =
118 &vring->va[vring->swtail].tx;
119 dma_addr_t pa = d->dma.addr_low |
120 ((u64)d->dma.addr_high << 32);
121 struct sk_buff *skb = vring->ctx[vring->swtail];
122 if (skb) {
123 dma_unmap_single(dev, pa, d->dma.length,
124 DMA_TO_DEVICE);
125 dev_kfree_skb_any(skb);
126 vring->ctx[vring->swtail] = NULL;
127 } else {
128 dma_unmap_page(dev, pa, d->dma.length,
129 DMA_TO_DEVICE);
130 }
131 vring->swtail = wil_vring_next_tail(vring);
132 } else { /* rx */
133 volatile struct vring_rx_desc *d =
134 &vring->va[vring->swtail].rx;
135 dma_addr_t pa = d->dma.addr_low |
136 ((u64)d->dma.addr_high << 32);
137 struct sk_buff *skb = vring->ctx[vring->swhead];
138 dma_unmap_single(dev, pa, d->dma.length,
139 DMA_FROM_DEVICE);
140 kfree_skb(skb);
141 wil_vring_advance_head(vring, 1);
142 }
143 }
144 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
145 kfree(vring->ctx);
146 vring->pa = 0;
147 vring->va = NULL;
148 vring->ctx = NULL;
149}
150
151/**
152 * Allocate one skb for Rx VRING
153 *
154 * Safe to call from IRQ
155 */
156static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
157 u32 i, int headroom)
158{
159 struct device *dev = wil_to_dev(wil);
160 unsigned int sz = RX_BUF_LEN;
161 volatile struct vring_rx_desc *d = &(vring->va[i].rx);
162 dma_addr_t pa;
163
164 /* TODO align */
165 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
166 if (unlikely(!skb))
167 return -ENOMEM;
168
169 skb_reserve(skb, headroom);
170 skb_put(skb, sz);
171
172 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
173 if (unlikely(dma_mapping_error(dev, pa))) {
174 kfree_skb(skb);
175 return -ENOMEM;
176 }
177
178 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
179 d->dma.addr_low = lower_32_bits(pa);
180 d->dma.addr_high = (u16)upper_32_bits(pa);
181 /* ip_length don't care */
182 /* b11 don't care */
183 /* error don't care */
184 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
185 d->dma.length = sz;
186 vring->ctx[i] = skb;
187
188 return 0;
189}
190
191/**
192 * Adds radiotap header
193 *
194 * Any error indicated as "Bad FCS"
195 *
196 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
197 * - Rx descriptor: 32 bytes
198 * - Phy info
199 */
200static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
201 struct sk_buff *skb,
202 volatile struct vring_rx_desc *d)
203{
204 struct wireless_dev *wdev = wil->wdev;
205 struct wil6210_rtap {
206 struct ieee80211_radiotap_header rthdr;
207 /* fields should be in the order of bits in rthdr.it_present */
208 /* flags */
209 u8 flags;
210 /* channel */
211 __le16 chnl_freq __aligned(2);
212 __le16 chnl_flags;
213 /* MCS */
214 u8 mcs_present;
215 u8 mcs_flags;
216 u8 mcs_index;
217 } __packed;
218 struct wil6210_rtap_vendor {
219 struct wil6210_rtap rtap;
220 /* vendor */
221 u8 vendor_oui[3] __aligned(2);
222 u8 vendor_ns;
223 __le16 vendor_skip;
224 u8 vendor_data[0];
225 } __packed;
226 struct wil6210_rtap_vendor *rtap_vendor;
227 int rtap_len = sizeof(struct wil6210_rtap);
228 int phy_length = 0; /* phy info header size, bytes */
229 static char phy_data[128];
230 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
231
232 if (rtap_include_phy_info) {
233 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
234 /* calculate additional length */
235 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
236 /**
237 * PHY info starts from 8-byte boundary
238 * there are 8-byte lines, last line may be partially
239 * written (HW bug), thus FW configures for last line
240 * to be excessive. Driver skips this last line.
241 */
242 int len = min_t(int, 8 + sizeof(phy_data),
243 wil_rxdesc_phy_length(d));
244 if (len > 8) {
245 void *p = skb_tail_pointer(skb);
246 void *pa = PTR_ALIGN(p, 8);
247 if (skb_tailroom(skb) >= len + (pa - p)) {
248 phy_length = len - 8;
249 memcpy(phy_data, pa, phy_length);
250 }
251 }
252 }
253 rtap_len += phy_length;
254 }
255
256 if (skb_headroom(skb) < rtap_len &&
257 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
258 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
259 return;
260 }
261
262 rtap_vendor = (void *)skb_push(skb, rtap_len);
263 memset(rtap_vendor, 0, rtap_len);
264
265 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
266 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
267 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
268 (1 << IEEE80211_RADIOTAP_FLAGS) |
269 (1 << IEEE80211_RADIOTAP_CHANNEL) |
270 (1 << IEEE80211_RADIOTAP_MCS));
271 if (d->dma.status & RX_DMA_STATUS_ERROR)
272 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
273
274 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
275 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
276
277 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
278 rtap_vendor->rtap.mcs_flags = 0;
279 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
280
281 if (rtap_include_phy_info) {
282 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
283 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
284 /* OUI for Wilocity 04:ce:14 */
285 rtap_vendor->vendor_oui[0] = 0x04;
286 rtap_vendor->vendor_oui[1] = 0xce;
287 rtap_vendor->vendor_oui[2] = 0x14;
288 rtap_vendor->vendor_ns = 1;
289 /* Rx descriptor + PHY data */
290 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
291 phy_length);
292 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
293 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
294 phy_length);
295 }
296}
297
298/*
299 * Fast swap in place between 2 registers
300 */
301static void wil_swap_u16(u16 *a, u16 *b)
302{
303 *a ^= *b;
304 *b ^= *a;
305 *a ^= *b;
306}
307
308static void wil_swap_ethaddr(void *data)
309{
310 struct ethhdr *eth = data;
311 u16 *s = (u16 *)eth->h_source;
312 u16 *d = (u16 *)eth->h_dest;
313
314 wil_swap_u16(s++, d++);
315 wil_swap_u16(s++, d++);
316 wil_swap_u16(s, d);
317}
318
319/**
320 * reap 1 frame from @swhead
321 *
322 * Safe to call from IRQ
323 */
324static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
325 struct vring *vring)
326{
327 struct device *dev = wil_to_dev(wil);
328 struct net_device *ndev = wil_to_ndev(wil);
329 volatile struct vring_rx_desc *d;
330 struct sk_buff *skb;
331 dma_addr_t pa;
332 unsigned int sz = RX_BUF_LEN;
333 u8 ftype;
334 u8 ds_bits;
335
336 if (wil_vring_is_empty(vring))
337 return NULL;
338
339 d = &(vring->va[vring->swhead].rx);
340 if (!(d->dma.status & RX_DMA_STATUS_DU)) {
341 /* it is not error, we just reached end of Rx done area */
342 return NULL;
343 }
344
345 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
346 skb = vring->ctx[vring->swhead];
347 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
348 skb_trim(skb, d->dma.length);
349
350 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
351
352 /* use radiotap header only if required */
353 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
354 wil_rx_add_radiotap_header(wil, skb, d);
355
356 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length);
357 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
358 (const void *)d, sizeof(*d), false);
359
360 wil_vring_advance_head(vring, 1);
361
362 /* no extra checks if in sniffer mode */
363 if (ndev->type != ARPHRD_ETHER)
364 return skb;
365 /*
366 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
367 * Driver should recognize it by frame type, that is found
368 * in Rx descriptor. If type is not data, it is 802.11 frame as is
369 */
370 ftype = wil_rxdesc_ftype(d) << 2;
371 if (ftype != IEEE80211_FTYPE_DATA) {
372 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
373 /* TODO: process it */
374 kfree_skb(skb);
375 return NULL;
376 }
377
378 if (skb->len < ETH_HLEN) {
379 wil_err(wil, "Short frame, len = %d\n", skb->len);
380 /* TODO: process it (i.e. BAR) */
381 kfree_skb(skb);
382 return NULL;
383 }
384
385 ds_bits = wil_rxdesc_ds_bits(d);
386 if (ds_bits == 1) {
387 /*
388 * HW bug - in ToDS mode, i.e. Rx on AP side,
389 * addresses get swapped
390 */
391 wil_swap_ethaddr(skb->data);
392 }
393
394 return skb;
395}
396
397/**
398 * allocate and fill up to @count buffers in rx ring
399 * buffers posted at @swtail
400 */
401static int wil_rx_refill(struct wil6210_priv *wil, int count)
402{
403 struct net_device *ndev = wil_to_ndev(wil);
404 struct vring *v = &wil->vring_rx;
405 u32 next_tail;
406 int rc = 0;
407 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
408 WIL6210_RTAP_SIZE : 0;
409
410 for (; next_tail = wil_vring_next_tail(v),
411 (next_tail != v->swhead) && (count-- > 0);
412 v->swtail = next_tail) {
413 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
414 if (rc) {
415 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
416 rc, v->swtail);
417 break;
418 }
419 }
420 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
421
422 return rc;
423}
424
425/*
426 * Pass Rx packet to the netif. Update statistics.
427 */
428static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
429{
430 int rc;
431 unsigned int len = skb->len;
432
433 skb_orphan(skb);
434
435 if (in_interrupt())
436 rc = netif_rx(skb);
437 else
438 rc = netif_rx_ni(skb);
439
440 if (likely(rc == NET_RX_SUCCESS)) {
441 ndev->stats.rx_packets++;
442 ndev->stats.rx_bytes += len;
443
444 } else {
445 ndev->stats.rx_dropped++;
446 }
447}
448
449/**
450 * Proceed all completed skb's from Rx VRING
451 *
452 * Safe to call from IRQ
453 */
454void wil_rx_handle(struct wil6210_priv *wil)
455{
456 struct net_device *ndev = wil_to_ndev(wil);
457 struct vring *v = &wil->vring_rx;
458 struct sk_buff *skb;
459
460 if (!v->va) {
461 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
462 return;
463 }
464 wil_dbg_txrx(wil, "%s()\n", __func__);
465 while (NULL != (skb = wil_vring_reap_rx(wil, v))) {
466 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
467 skb->data, skb_headlen(skb), false);
468
469 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
470 skb->dev = ndev;
471 skb_reset_mac_header(skb);
472 skb->ip_summed = CHECKSUM_UNNECESSARY;
473 skb->pkt_type = PACKET_OTHERHOST;
474 skb->protocol = htons(ETH_P_802_2);
475
476 } else {
477 skb->protocol = eth_type_trans(skb, ndev);
478 }
479
480 wil_netif_rx_any(skb, ndev);
481 }
482 wil_rx_refill(wil, v->size);
483}
484
485int wil_rx_init(struct wil6210_priv *wil)
486{
487 struct vring *vring = &wil->vring_rx;
488 int rc;
489
490 vring->size = WIL6210_RX_RING_SIZE;
491 rc = wil_vring_alloc(wil, vring);
492 if (rc)
493 return rc;
494
495 rc = wmi_rx_chain_add(wil, vring);
496 if (rc)
497 goto err_free;
498
499 rc = wil_rx_refill(wil, vring->size);
500 if (rc)
501 goto err_free;
502
503 return 0;
504 err_free:
505 wil_vring_free(wil, vring, 0);
506
507 return rc;
508}
509
510void wil_rx_fini(struct wil6210_priv *wil)
511{
512 struct vring *vring = &wil->vring_rx;
513
514 if (vring->va)
515 wil_vring_free(wil, vring, 0);
516}
517
518int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
519 int cid, int tid)
520{
521 int rc;
522 struct wmi_vring_cfg_cmd cmd = {
523 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
524 .vring_cfg = {
525 .tx_sw_ring = {
526 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
527 },
528 .ringid = id,
529 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
530 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
531 .mac_ctrl = 0,
532 .to_resolution = 0,
533 .agg_max_wsize = 16,
534 .schd_params = {
535 .priority = cpu_to_le16(0),
536 .timeslot_us = cpu_to_le16(0xfff),
537 },
538 },
539 };
540 struct {
541 struct wil6210_mbox_hdr_wmi wmi;
542 struct wmi_vring_cfg_done_event cmd;
543 } __packed reply;
544 struct vring *vring = &wil->vring_tx[id];
545
546 if (vring->va) {
547 wil_err(wil, "Tx ring [%d] already allocated\n", id);
548 rc = -EINVAL;
549 goto out;
550 }
551
552 vring->size = size;
553 rc = wil_vring_alloc(wil, vring);
554 if (rc)
555 goto out;
556
557 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
558 cmd.vring_cfg.tx_sw_ring.ring_size = cpu_to_le16(vring->size);
559
560 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
561 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
562 if (rc)
563 goto out_free;
564
565 if (reply.cmd.status != WMI_VRING_CFG_SUCCESS) {
566 wil_err(wil, "Tx config failed, status 0x%02x\n",
567 reply.cmd.status);
568 rc = -EINVAL;
569 goto out_free;
570 }
571 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
572
573 return 0;
574 out_free:
575 wil_vring_free(wil, vring, 1);
576 out:
577
578 return rc;
579}
580
581void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
582{
583 struct vring *vring = &wil->vring_tx[id];
584
585 if (!vring->va)
586 return;
587
588 wil_vring_free(wil, vring, 1);
589}
590
591static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
592 struct sk_buff *skb)
593{
594 struct vring *v = &wil->vring_tx[0];
595
596 if (v->va)
597 return v;
598
599 return NULL;
600}
601
602static int wil_tx_desc_map(volatile struct vring_tx_desc *d,
603 dma_addr_t pa, u32 len)
604{
605 d->dma.addr_low = lower_32_bits(pa);
606 d->dma.addr_high = (u16)upper_32_bits(pa);
607 d->dma.ip_length = 0;
608 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
609 d->dma.b11 = 0/*14 | BIT(7)*/;
610 d->dma.error = 0;
611 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
612 d->dma.length = len;
613 d->dma.d0 = 0;
614 d->mac.d[0] = 0;
615 d->mac.d[1] = 0;
616 d->mac.d[2] = 0;
617 d->mac.ucode_cmd = 0;
618 /* use dst index 0 */
619 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
620 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
621 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
622 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
623 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
624
625 return 0;
626}
627
628static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
629 struct sk_buff *skb)
630{
631 struct device *dev = wil_to_dev(wil);
632 volatile struct vring_tx_desc *d;
633 u32 swhead = vring->swhead;
634 int avail = wil_vring_avail_tx(vring);
635 int nr_frags = skb_shinfo(skb)->nr_frags;
636 uint f;
637 int vring_index = vring - wil->vring_tx;
638 uint i = swhead;
639 dma_addr_t pa;
640
641 wil_dbg_txrx(wil, "%s()\n", __func__);
642
643 if (avail < vring->size/8)
644 netif_tx_stop_all_queues(wil_to_ndev(wil));
645 if (avail < 1 + nr_frags) {
646 wil_err(wil, "Tx ring full. No space for %d fragments\n",
647 1 + nr_frags);
648 return -ENOMEM;
649 }
650 d = &(vring->va[i].tx);
651
652 /* FIXME FW can accept only unicast frames for the peer */
653 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
654
655 pa = dma_map_single(dev, skb->data,
656 skb_headlen(skb), DMA_TO_DEVICE);
657
658 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
659 skb->data, (unsigned long long)pa);
660 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
661 skb->data, skb_headlen(skb), false);
662
663 if (unlikely(dma_mapping_error(dev, pa)))
664 return -EINVAL;
665 /* 1-st segment */
666 wil_tx_desc_map(d, pa, skb_headlen(skb));
667 d->mac.d[2] |= ((nr_frags + 1) <<
668 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
669 /* middle segments */
670 for (f = 0; f < nr_frags; f++) {
671 const struct skb_frag_struct *frag =
672 &skb_shinfo(skb)->frags[f];
673 int len = skb_frag_size(frag);
674 i = (swhead + f + 1) % vring->size;
675 d = &(vring->va[i].tx);
676 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
677 DMA_TO_DEVICE);
678 if (unlikely(dma_mapping_error(dev, pa)))
679 goto dma_error;
680 wil_tx_desc_map(d, pa, len);
681 vring->ctx[i] = NULL;
682 }
683 /* for the last seg only */
684 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
685 d->dma.d0 |= BIT(9); /* BUG: undocumented bit */
686 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
687 d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
688
689 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
690 (const void *)d, sizeof(*d), false);
691
692 /* advance swhead */
693 wil_vring_advance_head(vring, nr_frags + 1);
694 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
695 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
696 /* hold reference to skb
697 * to prevent skb release before accounting
698 * in case of immediate "tx done"
699 */
700 vring->ctx[i] = skb_get(skb);
701
702 return 0;
703 dma_error:
704 /* unmap what we have mapped */
705 /* Note: increment @f to operate with positive index */
706 for (f++; f > 0; f--) {
707 i = (swhead + f) % vring->size;
708 d = &(vring->va[i].tx);
709 d->dma.status = TX_DMA_STATUS_DU;
710 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
711 if (vring->ctx[i])
712 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
713 else
714 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
715 }
716
717 return -EINVAL;
718}
719
720
721netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
722{
723 struct wil6210_priv *wil = ndev_to_wil(ndev);
724 struct vring *vring;
725 int rc;
726
727 wil_dbg_txrx(wil, "%s()\n", __func__);
728 if (!test_bit(wil_status_fwready, &wil->status)) {
729 wil_err(wil, "FW not ready\n");
730 goto drop;
731 }
732 if (!test_bit(wil_status_fwconnected, &wil->status)) {
733 wil_err(wil, "FW not connected\n");
734 goto drop;
735 }
736 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
737 wil_err(wil, "Xmit in monitor mode not supported\n");
738 goto drop;
739 }
740 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
741 rc = wmi_tx_eapol(wil, skb);
742 } else {
743 /* find vring */
744 vring = wil_find_tx_vring(wil, skb);
745 if (!vring) {
746 wil_err(wil, "No Tx VRING available\n");
747 goto drop;
748 }
749 /* set up vring entry */
750 rc = wil_tx_vring(wil, vring, skb);
751 }
752 switch (rc) {
753 case 0:
754 /* statistics will be updated on the tx_complete */
755 dev_kfree_skb_any(skb);
756 return NETDEV_TX_OK;
757 case -ENOMEM:
758 return NETDEV_TX_BUSY;
759 default:
760 break; /* goto drop; */
761 }
762 drop:
763 netif_tx_stop_all_queues(ndev);
764 ndev->stats.tx_dropped++;
765 dev_kfree_skb_any(skb);
766
767 return NET_XMIT_DROP;
768}
769
770/**
771 * Clean up transmitted skb's from the Tx VRING
772 *
773 * Safe to call from IRQ
774 */
775void wil_tx_complete(struct wil6210_priv *wil, int ringid)
776{
777 struct net_device *ndev = wil_to_ndev(wil);
778 struct device *dev = wil_to_dev(wil);
779 struct vring *vring = &wil->vring_tx[ringid];
780
781 if (!vring->va) {
782 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
783 return;
784 }
785
786 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
787
788 while (!wil_vring_is_empty(vring)) {
789 volatile struct vring_tx_desc *d = &vring->va[vring->swtail].tx;
790 dma_addr_t pa;
791 struct sk_buff *skb;
792 if (!(d->dma.status & TX_DMA_STATUS_DU))
793 break;
794
795 wil_dbg_txrx(wil,
796 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
797 vring->swtail, d->dma.length, d->dma.status,
798 d->dma.error);
799 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
800 (const void *)d, sizeof(*d), false);
801
802 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
803 skb = vring->ctx[vring->swtail];
804 if (skb) {
805 if (d->dma.error == 0) {
806 ndev->stats.tx_packets++;
807 ndev->stats.tx_bytes += skb->len;
808 } else {
809 ndev->stats.tx_errors++;
810 }
811
812 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
813 dev_kfree_skb_any(skb);
814 vring->ctx[vring->swtail] = NULL;
815 } else {
816 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
817 }
818 d->dma.addr_low = 0;
819 d->dma.addr_high = 0;
820 d->dma.length = 0;
821 d->dma.status = TX_DMA_STATUS_DU;
822 vring->swtail = wil_vring_next_tail(vring);
823 }
824 if (wil_vring_avail_tx(vring) > vring->size/4)
825 netif_tx_wake_all_queues(wil_to_ndev(wil));
826}
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-13 14:25:26 -0400