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wil6210: sync with new firmware
[deliverable/linux.git] / drivers / net / wireless / ath / wil6210 / txrx.c
CommitLineData
2be7d22f
VK		 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
2be7d22f 17#include <linux/etherdevice.h>
2be7d22f
VK		 18#include <net/ieee80211_radiotap.h>
19#include <linux/if_arp.h>
20#include <linux/moduleparam.h>
21
22#include "wil6210.h"
23#include "wmi.h"
24#include "txrx.h"
25
26static bool rtap_include_phy_info;
27module_param(rtap_include_phy_info, bool, S_IRUGO);
28MODULE_PARM_DESC(rtap_include_phy_info,
29 " Include PHY info in the radiotap header, default - no");
30
31static inline int wil_vring_is_empty(struct vring *vring)
32{
33 return vring->swhead == vring->swtail;
34}
35
36static inline u32 wil_vring_next_tail(struct vring *vring)
37{
38 return (vring->swtail + 1) % vring->size;
39}
40
41static inline void wil_vring_advance_head(struct vring *vring, int n)
42{
43 vring->swhead = (vring->swhead + n) % vring->size;
44}
45
46static inline int wil_vring_is_full(struct vring *vring)
47{
48 return wil_vring_next_tail(vring) == vring->swhead;
49}
50/*
51 * Available space in Tx Vring
52 */
53static inline int wil_vring_avail_tx(struct vring *vring)
54{
55 u32 swhead = vring->swhead;
56 u32 swtail = vring->swtail;
57 int used = (vring->size + swhead - swtail) % vring->size;
58
59 return vring->size - used - 1;
60}
61
62static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
63{
64 struct device *dev = wil_to_dev(wil);
65 size_t sz = vring->size * sizeof(vring->va[0]);
66 uint i;
67
68 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
69
70 vring->swhead = 0;
71 vring->swtail = 0;
72 vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL);
73 if (!vring->ctx) {
2be7d22f
VK		 74 vring->va = NULL;
75 return -ENOMEM;
76 }
77 /*
78 * vring->va should be aligned on its size rounded up to power of 2
79 * This is granted by the dma_alloc_coherent
80 */
81 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
82 if (!vring->va) {
83 wil_err(wil, "vring_alloc [%d] failed to alloc DMA mem\n",
84 vring->size);
85 kfree(vring->ctx);
86 vring->ctx = NULL;
87 return -ENOMEM;
88 }
89 /* initially, all descriptors are SW owned
90 * For Tx and Rx, ownership bit is at the same location, thus
91 * we can use any
92 */
93 for (i = 0; i < vring->size; i++) {
94 volatile struct vring_tx_desc *d = &(vring->va[i].tx);
95 d->dma.status = TX_DMA_STATUS_DU;
96 }
97
7743882d 98 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
2057ebb2 99 vring->va, (unsigned long long)vring->pa, vring->ctx);
2be7d22f
VK		 100
101 return 0;
102}
103
104static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
105 int tx)
106{
107 struct device *dev = wil_to_dev(wil);
108 size_t sz = vring->size * sizeof(vring->va[0]);
109
110 while (!wil_vring_is_empty(vring)) {
111 if (tx) {
112 volatile struct vring_tx_desc *d =
113 &vring->va[vring->swtail].tx;
114 dma_addr_t pa = d->dma.addr_low |
115 ((u64)d->dma.addr_high << 32);
116 struct sk_buff *skb = vring->ctx[vring->swtail];
117 if (skb) {
118 dma_unmap_single(dev, pa, d->dma.length,
119 DMA_TO_DEVICE);
120 dev_kfree_skb_any(skb);
121 vring->ctx[vring->swtail] = NULL;
122 } else {
123 dma_unmap_page(dev, pa, d->dma.length,
124 DMA_TO_DEVICE);
125 }
126 vring->swtail = wil_vring_next_tail(vring);
127 } else { /* rx */
128 volatile struct vring_rx_desc *d =
129 &vring->va[vring->swtail].rx;
130 dma_addr_t pa = d->dma.addr_low |
131 ((u64)d->dma.addr_high << 32);
132 struct sk_buff *skb = vring->ctx[vring->swhead];
133 dma_unmap_single(dev, pa, d->dma.length,
134 DMA_FROM_DEVICE);
135 kfree_skb(skb);
136 wil_vring_advance_head(vring, 1);
137 }
138 }
139 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
140 kfree(vring->ctx);
141 vring->pa = 0;
142 vring->va = NULL;
143 vring->ctx = NULL;
144}
145
146/**
147 * Allocate one skb for Rx VRING
148 *
149 * Safe to call from IRQ
150 */
151static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
152 u32 i, int headroom)
153{
154 struct device *dev = wil_to_dev(wil);
155 unsigned int sz = RX_BUF_LEN;
156 volatile struct vring_rx_desc *d = &(vring->va[i].rx);
157 dma_addr_t pa;
158
159 /* TODO align */
160 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
161 if (unlikely(!skb))
162 return -ENOMEM;
163
164 skb_reserve(skb, headroom);
165 skb_put(skb, sz);
166
167 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
168 if (unlikely(dma_mapping_error(dev, pa))) {
169 kfree_skb(skb);
170 return -ENOMEM;
171 }
172
173 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
174 d->dma.addr_low = lower_32_bits(pa);
175 d->dma.addr_high = (u16)upper_32_bits(pa);
176 /* ip_length don't care */
177 /* b11 don't care */
178 /* error don't care */
179 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
180 d->dma.length = sz;
181 vring->ctx[i] = skb;
182
183 return 0;
184}
185
186/**
187 * Adds radiotap header
188 *
189 * Any error indicated as "Bad FCS"
190 *
191 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
192 * - Rx descriptor: 32 bytes
193 * - Phy info
194 */
195static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
196 struct sk_buff *skb,
197 volatile struct vring_rx_desc *d)
198{
199 struct wireless_dev *wdev = wil->wdev;
200 struct wil6210_rtap {
201 struct ieee80211_radiotap_header rthdr;
202 /* fields should be in the order of bits in rthdr.it_present */
203 /* flags */
204 u8 flags;
205 /* channel */
206 __le16 chnl_freq __aligned(2);
207 __le16 chnl_flags;
208 /* MCS */
209 u8 mcs_present;
210 u8 mcs_flags;
211 u8 mcs_index;
212 } __packed;
213 struct wil6210_rtap_vendor {
214 struct wil6210_rtap rtap;
215 /* vendor */
216 u8 vendor_oui[3] __aligned(2);
217 u8 vendor_ns;
218 __le16 vendor_skip;
219 u8 vendor_data[0];
220 } __packed;
221 struct wil6210_rtap_vendor *rtap_vendor;
222 int rtap_len = sizeof(struct wil6210_rtap);
223 int phy_length = 0; /* phy info header size, bytes */
224 static char phy_data[128];
225 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
226
227 if (rtap_include_phy_info) {
228 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
229 /* calculate additional length */
230 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
231 /**
232 * PHY info starts from 8-byte boundary
233 * there are 8-byte lines, last line may be partially
234 * written (HW bug), thus FW configures for last line
235 * to be excessive. Driver skips this last line.
236 */
237 int len = min_t(int, 8 + sizeof(phy_data),
238 wil_rxdesc_phy_length(d));
239 if (len > 8) {
240 void *p = skb_tail_pointer(skb);
241 void *pa = PTR_ALIGN(p, 8);
242 if (skb_tailroom(skb) >= len + (pa - p)) {
243 phy_length = len - 8;
244 memcpy(phy_data, pa, phy_length);
245 }
246 }
247 }
248 rtap_len += phy_length;
249 }
250
251 if (skb_headroom(skb) < rtap_len &&
252 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
253 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
254 return;
255 }
256
257 rtap_vendor = (void *)skb_push(skb, rtap_len);
258 memset(rtap_vendor, 0, rtap_len);
259
260 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
261 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
262 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
263 (1 << IEEE80211_RADIOTAP_FLAGS) |
264 (1 << IEEE80211_RADIOTAP_CHANNEL) |
265 (1 << IEEE80211_RADIOTAP_MCS));
266 if (d->dma.status & RX_DMA_STATUS_ERROR)
267 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
268
269 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
270 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
271
272 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
273 rtap_vendor->rtap.mcs_flags = 0;
274 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
275
276 if (rtap_include_phy_info) {
277 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
278 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
279 /* OUI for Wilocity 04:ce:14 */
280 rtap_vendor->vendor_oui[0] = 0x04;
281 rtap_vendor->vendor_oui[1] = 0xce;
282 rtap_vendor->vendor_oui[2] = 0x14;
283 rtap_vendor->vendor_ns = 1;
284 /* Rx descriptor + PHY data */
285 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
286 phy_length);
287 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
288 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
289 phy_length);
290 }
291}
292
293/*
294 * Fast swap in place between 2 registers
295 */
296static void wil_swap_u16(u16 *a, u16 *b)
297{
298 *a ^= *b;
299 *b ^= *a;
300 *a ^= *b;
301}
302
303static void wil_swap_ethaddr(void *data)
304{
305 struct ethhdr *eth = data;
306 u16 *s = (u16 *)eth->h_source;
307 u16 *d = (u16 *)eth->h_dest;
308
309 wil_swap_u16(s++, d++);
310 wil_swap_u16(s++, d++);
311 wil_swap_u16(s, d);
312}
313
314/**
315 * reap 1 frame from @swhead
316 *
317 * Safe to call from IRQ
318 */
319static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
320 struct vring *vring)
321{
322 struct device *dev = wil_to_dev(wil);
323 struct net_device *ndev = wil_to_ndev(wil);
324 volatile struct vring_rx_desc *d;
325 struct sk_buff *skb;
326 dma_addr_t pa;
327 unsigned int sz = RX_BUF_LEN;
328 u8 ftype;
329 u8 ds_bits;
330
331 if (wil_vring_is_empty(vring))
332 return NULL;
333
334 d = &(vring->va[vring->swhead].rx);
335 if (!(d->dma.status & RX_DMA_STATUS_DU)) {
336 /* it is not error, we just reached end of Rx done area */
337 return NULL;
338 }
339
340 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
341 skb = vring->ctx[vring->swhead];
342 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
343 skb_trim(skb, d->dma.length);
344
345 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
346
347 /* use radiotap header only if required */
348 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
349 wil_rx_add_radiotap_header(wil, skb, d);
350
7743882d
VK		 351 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length);
352 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
2be7d22f
VK		 353 (const void *)d, sizeof(*d), false);
354
355 wil_vring_advance_head(vring, 1);
356
357 /* no extra checks if in sniffer mode */
358 if (ndev->type != ARPHRD_ETHER)
359 return skb;
360 /*
361 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
362 * Driver should recognize it by frame type, that is found
363 * in Rx descriptor. If type is not data, it is 802.11 frame as is
364 */
365 ftype = wil_rxdesc_ftype(d) << 2;
366 if (ftype != IEEE80211_FTYPE_DATA) {
7743882d 367 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
2be7d22f
VK		 368 /* TODO: process it */
369 kfree_skb(skb);
370 return NULL;
371 }
372
373 if (skb->len < ETH_HLEN) {
374 wil_err(wil, "Short frame, len = %d\n", skb->len);
375 /* TODO: process it (i.e. BAR) */
376 kfree_skb(skb);
377 return NULL;
378 }
379
380 ds_bits = wil_rxdesc_ds_bits(d);
381 if (ds_bits == 1) {
382 /*
383 * HW bug - in ToDS mode, i.e. Rx on AP side,
384 * addresses get swapped
385 */
386 wil_swap_ethaddr(skb->data);
387 }
388
389 return skb;
390}
391
392/**
393 * allocate and fill up to @count buffers in rx ring
394 * buffers posted at @swtail
395 */
396static int wil_rx_refill(struct wil6210_priv *wil, int count)
397{
398 struct net_device *ndev = wil_to_ndev(wil);
399 struct vring *v = &wil->vring_rx;
400 u32 next_tail;
401 int rc = 0;
402 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
403 WIL6210_RTAP_SIZE : 0;
404
405 for (; next_tail = wil_vring_next_tail(v),
406 (next_tail != v->swhead) && (count-- > 0);
407 v->swtail = next_tail) {
408 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
409 if (rc) {
410 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
411 rc, v->swtail);
412 break;
413 }
414 }
415 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
416
417 return rc;
418}
419
420/*
421 * Pass Rx packet to the netif. Update statistics.
422 */
423static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
424{
425 int rc;
426 unsigned int len = skb->len;
427
241804cb
VK		 428 skb_orphan(skb);
429
2be7d22f
VK		 430 if (in_interrupt())
431 rc = netif_rx(skb);
432 else
433 rc = netif_rx_ni(skb);
434
435 if (likely(rc == NET_RX_SUCCESS)) {
436 ndev->stats.rx_packets++;
437 ndev->stats.rx_bytes += len;
438
439 } else {
440 ndev->stats.rx_dropped++;
441 }
442}
443
444/**
445 * Proceed all completed skb's from Rx VRING
446 *
447 * Safe to call from IRQ
448 */
449void wil_rx_handle(struct wil6210_priv *wil)
450{
451 struct net_device *ndev = wil_to_ndev(wil);
452 struct vring *v = &wil->vring_rx;
453 struct sk_buff *skb;
454
455 if (!v->va) {
456 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
457 return;
458 }
7743882d 459 wil_dbg_txrx(wil, "%s()\n", __func__);
2be7d22f 460 while (NULL != (skb = wil_vring_reap_rx(wil, v))) {
7743882d 461 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
2be7d22f
VK		 462 skb->data, skb_headlen(skb), false);
463
2be7d22f
VK		 464 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
465 skb->dev = ndev;
466 skb_reset_mac_header(skb);
467 skb->ip_summed = CHECKSUM_UNNECESSARY;
468 skb->pkt_type = PACKET_OTHERHOST;
469 skb->protocol = htons(ETH_P_802_2);
470
471 } else {
472 skb->protocol = eth_type_trans(skb, ndev);
473 }
474
475 wil_netif_rx_any(skb, ndev);
476 }
477 wil_rx_refill(wil, v->size);
478}
479
480int wil_rx_init(struct wil6210_priv *wil)
481{
2be7d22f
VK		 482 struct vring *vring = &wil->vring_rx;
483 int rc;
2be7d22f
VK		 484
485 vring->size = WIL6210_RX_RING_SIZE;
486 rc = wil_vring_alloc(wil, vring);
487 if (rc)
488 return rc;
489
47e19af9 490 rc = wmi_rx_chain_add(wil, vring);
2be7d22f
VK		 491 if (rc)
492 goto err_free;
493
2be7d22f
VK		 494 rc = wil_rx_refill(wil, vring->size);
495 if (rc)
496 goto err_free;
497
498 return 0;
499 err_free:
500 wil_vring_free(wil, vring, 0);
501
502 return rc;
503}
504
505void wil_rx_fini(struct wil6210_priv *wil)
506{
507 struct vring *vring = &wil->vring_rx;
508
2acb4220 509 if (vring->va)
2be7d22f 510 wil_vring_free(wil, vring, 0);
2be7d22f
VK		 511}
512
513int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
514 int cid, int tid)
515{
516 int rc;
517 struct wmi_vring_cfg_cmd cmd = {
518 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
519 .vring_cfg = {
520 .tx_sw_ring = {
521 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
522 },
523 .ringid = id,
524 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
525 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
526 .mac_ctrl = 0,
527 .to_resolution = 0,
528 .agg_max_wsize = 16,
529 .schd_params = {
530 .priority = cpu_to_le16(0),
531 .timeslot_us = cpu_to_le16(0xfff),
532 },
533 },
534 };
535 struct {
536 struct wil6210_mbox_hdr_wmi wmi;
537 struct wmi_vring_cfg_done_event cmd;
538 } __packed reply;
539 struct vring *vring = &wil->vring_tx[id];
540
541 if (vring->va) {
542 wil_err(wil, "Tx ring [%d] already allocated\n", id);
543 rc = -EINVAL;
544 goto out;
545 }
546
547 vring->size = size;
548 rc = wil_vring_alloc(wil, vring);
549 if (rc)
550 goto out;
551
552 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
553 cmd.vring_cfg.tx_sw_ring.ring_size = cpu_to_le16(vring->size);
554
555 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
556 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
557 if (rc)
558 goto out_free;
559
b8023177 560 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
2be7d22f
VK		 561 wil_err(wil, "Tx config failed, status 0x%02x\n",
562 reply.cmd.status);
c331997b 563 rc = -EINVAL;
2be7d22f
VK		 564 goto out_free;
565 }
566 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
567
568 return 0;
569 out_free:
570 wil_vring_free(wil, vring, 1);
571 out:
572
573 return rc;
574}
575
576void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
577{
578 struct vring *vring = &wil->vring_tx[id];
579
580 if (!vring->va)
581 return;
582
583 wil_vring_free(wil, vring, 1);
584}
585
586static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
587 struct sk_buff *skb)
588{
589 struct vring *v = &wil->vring_tx[0];
590
591 if (v->va)
592 return v;
593
594 return NULL;
595}
596
597static int wil_tx_desc_map(volatile struct vring_tx_desc *d,
598 dma_addr_t pa, u32 len)
599{
600 d->dma.addr_low = lower_32_bits(pa);
601 d->dma.addr_high = (u16)upper_32_bits(pa);
602 d->dma.ip_length = 0;
603 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
604 d->dma.b11 = 0/*14 | BIT(7)*/;
605 d->dma.error = 0;
606 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
607 d->dma.length = len;
608 d->dma.d0 = 0;
609 d->mac.d[0] = 0;
610 d->mac.d[1] = 0;
611 d->mac.d[2] = 0;
612 d->mac.ucode_cmd = 0;
613 /* use dst index 0 */
614 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
615 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
616 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
617 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
618 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
619
620 return 0;
621}
622
623static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
624 struct sk_buff *skb)
625{
626 struct device *dev = wil_to_dev(wil);
627 volatile struct vring_tx_desc *d;
628 u32 swhead = vring->swhead;
629 int avail = wil_vring_avail_tx(vring);
630 int nr_frags = skb_shinfo(skb)->nr_frags;
631 uint f;
632 int vring_index = vring - wil->vring_tx;
633 uint i = swhead;
634 dma_addr_t pa;
635
7743882d 636 wil_dbg_txrx(wil, "%s()\n", __func__);
2be7d22f
VK		 637
638 if (avail < vring->size/8)
639 netif_tx_stop_all_queues(wil_to_ndev(wil));
640 if (avail < 1 + nr_frags) {
641 wil_err(wil, "Tx ring full. No space for %d fragments\n",
642 1 + nr_frags);
643 return -ENOMEM;
644 }
645 d = &(vring->va[i].tx);
646
647 /* FIXME FW can accept only unicast frames for the peer */
648 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
649
650 pa = dma_map_single(dev, skb->data,
651 skb_headlen(skb), DMA_TO_DEVICE);
652
7743882d 653 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
2be7d22f 654 skb->data, (unsigned long long)pa);
7743882d 655 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
2be7d22f
VK		 656 skb->data, skb_headlen(skb), false);
657
658 if (unlikely(dma_mapping_error(dev, pa)))
659 return -EINVAL;
660 /* 1-st segment */
661 wil_tx_desc_map(d, pa, skb_headlen(skb));
662 d->mac.d[2] |= ((nr_frags + 1) <<
663 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
664 /* middle segments */
665 for (f = 0; f < nr_frags; f++) {
666 const struct skb_frag_struct *frag =
667 &skb_shinfo(skb)->frags[f];
668 int len = skb_frag_size(frag);
669 i = (swhead + f + 1) % vring->size;
670 d = &(vring->va[i].tx);
671 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
672 DMA_TO_DEVICE);
673 if (unlikely(dma_mapping_error(dev, pa)))
674 goto dma_error;
675 wil_tx_desc_map(d, pa, len);
676 vring->ctx[i] = NULL;
677 }
678 /* for the last seg only */
679 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
680 d->dma.d0 |= BIT(9); /* BUG: undocumented bit */
681 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
682 d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
683
7743882d 684 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
2be7d22f
VK		 685 (const void *)d, sizeof(*d), false);
686
687 /* advance swhead */
688 wil_vring_advance_head(vring, nr_frags + 1);
7743882d 689 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
2be7d22f
VK		 690 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
691 /* hold reference to skb
692 * to prevent skb release before accounting
693 * in case of immediate "tx done"
694 */
695 vring->ctx[i] = skb_get(skb);
696
697 return 0;
698 dma_error:
699 /* unmap what we have mapped */
700 /* Note: increment @f to operate with positive index */
701 for (f++; f > 0; f--) {
702 i = (swhead + f) % vring->size;
703 d = &(vring->va[i].tx);
704 d->dma.status = TX_DMA_STATUS_DU;
705 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
706 if (vring->ctx[i])
707 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
708 else
709 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
710 }
711
712 return -EINVAL;
713}
714
715
716netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
717{
718 struct wil6210_priv *wil = ndev_to_wil(ndev);
719 struct vring *vring;
720 int rc;
721
7743882d 722 wil_dbg_txrx(wil, "%s()\n", __func__);
2be7d22f
VK		 723 if (!test_bit(wil_status_fwready, &wil->status)) {
724 wil_err(wil, "FW not ready\n");
725 goto drop;
726 }
727 if (!test_bit(wil_status_fwconnected, &wil->status)) {
728 wil_err(wil, "FW not connected\n");
729 goto drop;
730 }
731 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
732 wil_err(wil, "Xmit in monitor mode not supported\n");
733 goto drop;
734 }
735 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
736 rc = wmi_tx_eapol(wil, skb);
737 } else {
738 /* find vring */
739 vring = wil_find_tx_vring(wil, skb);
740 if (!vring) {
741 wil_err(wil, "No Tx VRING available\n");
742 goto drop;
743 }
744 /* set up vring entry */
745 rc = wil_tx_vring(wil, vring, skb);
746 }
747 switch (rc) {
748 case 0:
795ce734 749 /* statistics will be updated on the tx_complete */
2be7d22f
VK		 750 dev_kfree_skb_any(skb);
751 return NETDEV_TX_OK;
752 case -ENOMEM:
753 return NETDEV_TX_BUSY;
754 default:
afda8bb5 755 break; /* goto drop; */
2be7d22f
VK		 756 }
757 drop:
758 netif_tx_stop_all_queues(ndev);
759 ndev->stats.tx_dropped++;
760 dev_kfree_skb_any(skb);
761
762 return NET_XMIT_DROP;
763}
764
765/**
766 * Clean up transmitted skb's from the Tx VRING
767 *
768 * Safe to call from IRQ
769 */
770void wil_tx_complete(struct wil6210_priv *wil, int ringid)
771{
795ce734 772 struct net_device *ndev = wil_to_ndev(wil);
2be7d22f
VK		 773 struct device *dev = wil_to_dev(wil);
774 struct vring *vring = &wil->vring_tx[ringid];
775
776 if (!vring->va) {
777 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
778 return;
779 }
780
7743882d 781 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
2be7d22f
VK		 782
783 while (!wil_vring_is_empty(vring)) {
784 volatile struct vring_tx_desc *d = &vring->va[vring->swtail].tx;
785 dma_addr_t pa;
786 struct sk_buff *skb;
787 if (!(d->dma.status & TX_DMA_STATUS_DU))
788 break;
789
7743882d 790 wil_dbg_txrx(wil,
2be7d22f
VK		 791 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
792 vring->swtail, d->dma.length, d->dma.status,
793 d->dma.error);
7743882d 794 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
2be7d22f
VK		 795 (const void *)d, sizeof(*d), false);
796
797 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
798 skb = vring->ctx[vring->swtail];
799 if (skb) {
795ce734
VK		 800 if (d->dma.error == 0) {
801 ndev->stats.tx_packets++;
802 ndev->stats.tx_bytes += skb->len;
803 } else {
804 ndev->stats.tx_errors++;
805 }
806
2be7d22f
VK		 807 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
808 dev_kfree_skb_any(skb);
809 vring->ctx[vring->swtail] = NULL;
810 } else {
811 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
812 }
813 d->dma.addr_low = 0;
814 d->dma.addr_high = 0;
815 d->dma.length = 0;
816 d->dma.status = TX_DMA_STATUS_DU;
817 vring->swtail = wil_vring_next_tail(vring);
818 }
819 if (wil_vring_avail_tx(vring) > vring->size/4)
820 netif_tx_wake_all_queues(wil_to_ndev(wil));
821}
Linux kernel - Deliverables
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