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Linux 3.18.86
[linux/fpc-iii.git] / drivers / net / wireless / ath / wil6210 / txrx.c
blob2936ef0c18cbc700003760e5a93a9f504b9d8840
1 /*
2 * Copyright (c) 2012-2014 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/etherdevice.h>
18 #include <net/ieee80211_radiotap.h>
19 #include <linux/if_arp.h>
20 #include <linux/moduleparam.h>
21 #include <linux/ip.h>
22 #include <linux/ipv6.h>
23 #include <net/ipv6.h>
24 #include <linux/prefetch.h>
25
26 #include "wil6210.h"
27 #include "wmi.h"
28 #include "txrx.h"
29 #include "trace.h"
30
31 static bool rtap_include_phy_info;
32 module_param(rtap_include_phy_info, bool, S_IRUGO);
33 MODULE_PARM_DESC(rtap_include_phy_info,
34 " Include PHY info in the radiotap header, default - no");
35
36 static inline int wil_vring_is_empty(struct vring *vring)
37 {
38 return vring->swhead == vring->swtail;
39 }
40
41 static inline u32 wil_vring_next_tail(struct vring *vring)
42 {
43 return (vring->swtail + 1) % vring->size;
44 }
45
46 static inline void wil_vring_advance_head(struct vring *vring, int n)
47 {
48 vring->swhead = (vring->swhead + n) % vring->size;
49 }
50
51 static inline int wil_vring_is_full(struct vring *vring)
52 {
53 return wil_vring_next_tail(vring) == vring->swhead;
54 }
55
56 /*
57 * Available space in Tx Vring
58 */
59 static inline int wil_vring_avail_tx(struct vring *vring)
60 {
61 u32 swhead = vring->swhead;
62 u32 swtail = vring->swtail;
63 int used = (vring->size + swhead - swtail) % vring->size;
64
65 return vring->size - used - 1;
66 }
67
68 /**
69 * wil_vring_wmark_low - low watermark for available descriptor space
70 */
71 static inline int wil_vring_wmark_low(struct vring *vring)
72 {
73 return vring->size/8;
74 }
75
76 /**
77 * wil_vring_wmark_high - high watermark for available descriptor space
78 */
79 static inline int wil_vring_wmark_high(struct vring *vring)
80 {
81 return vring->size/4;
82 }
83
84 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
85 {
86 struct device *dev = wil_to_dev(wil);
87 size_t sz = vring->size * sizeof(vring->va[0]);
88 uint i;
89
90 wil_dbg_misc(wil, "%s()\n", __func__);
91
92 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
93
94 vring->swhead = 0;
95 vring->swtail = 0;
96 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
97 if (!vring->ctx) {
98 vring->va = NULL;
99 return -ENOMEM;
100 }
101 /*
102 * vring->va should be aligned on its size rounded up to power of 2
103 * This is granted by the dma_alloc_coherent
104 */
105 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
106 if (!vring->va) {
107 kfree(vring->ctx);
108 vring->ctx = NULL;
109 return -ENOMEM;
110 }
111 /* initially, all descriptors are SW owned
112 * For Tx and Rx, ownership bit is at the same location, thus
113 * we can use any
114 */
115 for (i = 0; i < vring->size; i++) {
116 volatile struct vring_tx_desc *_d = &vring->va[i].tx;
117
118 _d->dma.status = TX_DMA_STATUS_DU;
119 }
120
121 wil_dbg_misc(wil, "vring[%d] 0x%p:%pad 0x%p\n", vring->size,
122 vring->va, &vring->pa, vring->ctx);
123
124 return 0;
125 }
126
127 static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d,
128 struct wil_ctx *ctx)
129 {
130 dma_addr_t pa = wil_desc_addr(&d->dma.addr);
131 u16 dmalen = le16_to_cpu(d->dma.length);
132
133 switch (ctx->mapped_as) {
134 case wil_mapped_as_single:
135 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
136 break;
137 case wil_mapped_as_page:
138 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
139 break;
140 default:
141 break;
142 }
143 }
144
145 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
146 int tx)
147 {
148 struct device *dev = wil_to_dev(wil);
149 size_t sz = vring->size * sizeof(vring->va[0]);
150
151 if (tx) {
152 int vring_index = vring - wil->vring_tx;
153
154 wil_dbg_misc(wil, "free Tx vring %d [%d] 0x%p:%pad 0x%p\n",
155 vring_index, vring->size, vring->va,
156 &vring->pa, vring->ctx);
157 } else {
158 wil_dbg_misc(wil, "free Rx vring [%d] 0x%p:%pad 0x%p\n",
159 vring->size, vring->va,
160 &vring->pa, vring->ctx);
161 }
162
163 while (!wil_vring_is_empty(vring)) {
164 dma_addr_t pa;
165 u16 dmalen;
166 struct wil_ctx *ctx;
167
168 if (tx) {
169 struct vring_tx_desc dd, *d = &dd;
170 volatile struct vring_tx_desc *_d =
171 &vring->va[vring->swtail].tx;
172
173 ctx = &vring->ctx[vring->swtail];
174 *d = *_d;
175 wil_txdesc_unmap(dev, d, ctx);
176 if (ctx->skb)
177 dev_kfree_skb_any(ctx->skb);
178 vring->swtail = wil_vring_next_tail(vring);
179 } else { /* rx */
180 struct vring_rx_desc dd, *d = &dd;
181 volatile struct vring_rx_desc *_d =
182 &vring->va[vring->swhead].rx;
183
184 ctx = &vring->ctx[vring->swhead];
185 *d = *_d;
186 pa = wil_desc_addr(&d->dma.addr);
187 dmalen = le16_to_cpu(d->dma.length);
188 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
189 kfree_skb(ctx->skb);
190 wil_vring_advance_head(vring, 1);
191 }
192 }
193 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
194 kfree(vring->ctx);
195 vring->pa = 0;
196 vring->va = NULL;
197 vring->ctx = NULL;
198 }
199
200 /**
201 * Allocate one skb for Rx VRING
202 *
203 * Safe to call from IRQ
204 */
205 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
206 u32 i, int headroom)
207 {
208 struct device *dev = wil_to_dev(wil);
209 unsigned int sz = RX_BUF_LEN;
210 struct vring_rx_desc dd, *d = &dd;
211 volatile struct vring_rx_desc *_d = &vring->va[i].rx;
212 dma_addr_t pa;
213
214 /* TODO align */
215 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
216
217 if (unlikely(!skb))
218 return -ENOMEM;
219
220 skb_reserve(skb, headroom);
221 skb_put(skb, sz);
222
223 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
224 if (unlikely(dma_mapping_error(dev, pa))) {
225 kfree_skb(skb);
226 return -ENOMEM;
227 }
228
229 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
230 wil_desc_addr_set(&d->dma.addr, pa);
231 /* ip_length don't care */
232 /* b11 don't care */
233 /* error don't care */
234 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
235 d->dma.length = cpu_to_le16(sz);
236 *_d = *d;
237 vring->ctx[i].skb = skb;
238
239 return 0;
240 }
241
242 /**
243 * Adds radiotap header
244 *
245 * Any error indicated as "Bad FCS"
246 *
247 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
248 * - Rx descriptor: 32 bytes
249 * - Phy info
250 */
251 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
252 struct sk_buff *skb)
253 {
254 struct wireless_dev *wdev = wil->wdev;
255 struct wil6210_rtap {
256 struct ieee80211_radiotap_header rthdr;
257 /* fields should be in the order of bits in rthdr.it_present */
258 /* flags */
259 u8 flags;
260 /* channel */
261 __le16 chnl_freq __aligned(2);
262 __le16 chnl_flags;
263 /* MCS */
264 u8 mcs_present;
265 u8 mcs_flags;
266 u8 mcs_index;
267 } __packed;
268 struct wil6210_rtap_vendor {
269 struct wil6210_rtap rtap;
270 /* vendor */
271 u8 vendor_oui[3] __aligned(2);
272 u8 vendor_ns;
273 __le16 vendor_skip;
274 u8 vendor_data[0];
275 } __packed;
276 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
277 struct wil6210_rtap_vendor *rtap_vendor;
278 int rtap_len = sizeof(struct wil6210_rtap);
279 int phy_length = 0; /* phy info header size, bytes */
280 static char phy_data[128];
281 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
282
283 if (rtap_include_phy_info) {
284 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
285 /* calculate additional length */
286 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
287 /**
288 * PHY info starts from 8-byte boundary
289 * there are 8-byte lines, last line may be partially
290 * written (HW bug), thus FW configures for last line
291 * to be excessive. Driver skips this last line.
292 */
293 int len = min_t(int, 8 + sizeof(phy_data),
294 wil_rxdesc_phy_length(d));
295
296 if (len > 8) {
297 void *p = skb_tail_pointer(skb);
298 void *pa = PTR_ALIGN(p, 8);
299
300 if (skb_tailroom(skb) >= len + (pa - p)) {
301 phy_length = len - 8;
302 memcpy(phy_data, pa, phy_length);
303 }
304 }
305 }
306 rtap_len += phy_length;
307 }
308
309 if (skb_headroom(skb) < rtap_len &&
310 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
311 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
312 return;
313 }
314
315 rtap_vendor = (void *)skb_push(skb, rtap_len);
316 memset(rtap_vendor, 0, rtap_len);
317
318 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
319 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
320 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
321 (1 << IEEE80211_RADIOTAP_FLAGS) |
322 (1 << IEEE80211_RADIOTAP_CHANNEL) |
323 (1 << IEEE80211_RADIOTAP_MCS));
324 if (d->dma.status & RX_DMA_STATUS_ERROR)
325 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
326
327 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
328 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
329
330 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
331 rtap_vendor->rtap.mcs_flags = 0;
332 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
333
334 if (rtap_include_phy_info) {
335 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
336 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
337 /* OUI for Wilocity 04:ce:14 */
338 rtap_vendor->vendor_oui[0] = 0x04;
339 rtap_vendor->vendor_oui[1] = 0xce;
340 rtap_vendor->vendor_oui[2] = 0x14;
341 rtap_vendor->vendor_ns = 1;
342 /* Rx descriptor + PHY data */
343 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
344 phy_length);
345 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
346 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
347 phy_length);
348 }
349 }
350
351 /*
352 * Fast swap in place between 2 registers
353 */
354 static void wil_swap_u16(u16 *a, u16 *b)
355 {
356 *a ^= *b;
357 *b ^= *a;
358 *a ^= *b;
359 }
360
361 static void wil_swap_ethaddr(void *data)
362 {
363 struct ethhdr *eth = data;
364 u16 *s = (u16 *)eth->h_source;
365 u16 *d = (u16 *)eth->h_dest;
366
367 wil_swap_u16(s++, d++);
368 wil_swap_u16(s++, d++);
369 wil_swap_u16(s, d);
370 }
371
372 /**
373 * reap 1 frame from @swhead
374 *
375 * Rx descriptor copied to skb->cb
376 *
377 * Safe to call from IRQ
378 */
379 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
380 struct vring *vring)
381 {
382 struct device *dev = wil_to_dev(wil);
383 struct net_device *ndev = wil_to_ndev(wil);
384 volatile struct vring_rx_desc *_d;
385 struct vring_rx_desc *d;
386 struct sk_buff *skb;
387 dma_addr_t pa;
388 unsigned int sz = RX_BUF_LEN;
389 u16 dmalen;
390 u8 ftype;
391 u8 ds_bits;
392 int cid;
393 struct wil_net_stats *stats;
394
395 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
396
397 if (wil_vring_is_empty(vring))
398 return NULL;
399
400 _d = &vring->va[vring->swhead].rx;
401 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
402 /* it is not error, we just reached end of Rx done area */
403 return NULL;
404 }
405
406 skb = vring->ctx[vring->swhead].skb;
407 d = wil_skb_rxdesc(skb);
408 *d = *_d;
409 pa = wil_desc_addr(&d->dma.addr);
410 vring->ctx[vring->swhead].skb = NULL;
411 wil_vring_advance_head(vring, 1);
412
413 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
414 dmalen = le16_to_cpu(d->dma.length);
415
416 trace_wil6210_rx(vring->swhead, d);
417 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
418 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
419 (const void *)d, sizeof(*d), false);
420
421 if (dmalen > sz) {
422 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
423 kfree_skb(skb);
424 return NULL;
425 }
426 skb_trim(skb, dmalen);
427
428 prefetch(skb->data);
429
430 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
431 skb->data, skb_headlen(skb), false);
432
433 cid = wil_rxdesc_cid(d);
434 stats = &wil->sta[cid].stats;
435 stats->last_mcs_rx = wil_rxdesc_mcs(d);
436
437 /* use radiotap header only if required */
438 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
439 wil_rx_add_radiotap_header(wil, skb);
440
441 /* no extra checks if in sniffer mode */
442 if (ndev->type != ARPHRD_ETHER)
443 return skb;
444 /*
445 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
446 * Driver should recognize it by frame type, that is found
447 * in Rx descriptor. If type is not data, it is 802.11 frame as is
448 */
449 ftype = wil_rxdesc_ftype(d) << 2;
450 if (ftype != IEEE80211_FTYPE_DATA) {
451 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
452 /* TODO: process it */
453 kfree_skb(skb);
454 return NULL;
455 }
456
457 if (skb->len < ETH_HLEN) {
458 wil_err(wil, "Short frame, len = %d\n", skb->len);
459 /* TODO: process it (i.e. BAR) */
460 kfree_skb(skb);
461 return NULL;
462 }
463
464 /* L4 IDENT is on when HW calculated checksum, check status
465 * and in case of error drop the packet
466 * higher stack layers will handle retransmission (if required)
467 */
468 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
469 /* L4 protocol identified, csum calculated */
470 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
471 skb->ip_summed = CHECKSUM_UNNECESSARY;
472 /* If HW reports bad checksum, let IP stack re-check it
473 * For example, HW don't understand Microsoft IP stack that
474 * mis-calculates TCP checksum - if it should be 0x0,
475 * it writes 0xffff in violation of RFC 1624
476 */
477 }
478
479 ds_bits = wil_rxdesc_ds_bits(d);
480 if (ds_bits == 1) {
481 /*
482 * HW bug - in ToDS mode, i.e. Rx on AP side,
483 * addresses get swapped
484 */
485 wil_swap_ethaddr(skb->data);
486 }
487
488 return skb;
489 }
490
491 /**
492 * allocate and fill up to @count buffers in rx ring
493 * buffers posted at @swtail
494 */
495 static int wil_rx_refill(struct wil6210_priv *wil, int count)
496 {
497 struct net_device *ndev = wil_to_ndev(wil);
498 struct vring *v = &wil->vring_rx;
499 u32 next_tail;
500 int rc = 0;
501 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
502 WIL6210_RTAP_SIZE : 0;
503
504 for (; next_tail = wil_vring_next_tail(v),
505 (next_tail != v->swhead) && (count-- > 0);
506 v->swtail = next_tail) {
507 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
508 if (rc) {
509 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
510 rc, v->swtail);
511 break;
512 }
513 }
514 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
515
516 return rc;
517 }
518
519 /*
520 * Pass Rx packet to the netif. Update statistics.
521 * Called in softirq context (NAPI poll).
522 */
523 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
524 {
525 gro_result_t rc;
526 struct wil6210_priv *wil = ndev_to_wil(ndev);
527 unsigned int len = skb->len;
528 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
529 int cid = wil_rxdesc_cid(d);
530 struct wil_net_stats *stats = &wil->sta[cid].stats;
531
532 skb_orphan(skb);
533
534 rc = napi_gro_receive(&wil->napi_rx, skb);
535
536 if (unlikely(rc == GRO_DROP)) {
537 ndev->stats.rx_dropped++;
538 stats->rx_dropped++;
539 wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
540 } else {
541 ndev->stats.rx_packets++;
542 stats->rx_packets++;
543 ndev->stats.rx_bytes += len;
544 stats->rx_bytes += len;
545 }
546 {
547 static const char * const gro_res_str[] = {
548 [GRO_MERGED] = "GRO_MERGED",
549 [GRO_MERGED_FREE] = "GRO_MERGED_FREE",
550 [GRO_HELD] = "GRO_HELD",
551 [GRO_NORMAL] = "GRO_NORMAL",
552 [GRO_DROP] = "GRO_DROP",
553 };
554 wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n",
555 len, gro_res_str[rc]);
556 }
557 }
558
559 /**
560 * Proceed all completed skb's from Rx VRING
561 *
562 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
563 */
564 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
565 {
566 struct net_device *ndev = wil_to_ndev(wil);
567 struct vring *v = &wil->vring_rx;
568 struct sk_buff *skb;
569
570 if (!v->va) {
571 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
572 return;
573 }
574 wil_dbg_txrx(wil, "%s()\n", __func__);
575 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
576 (*quota)--;
577
578 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
579 skb->dev = ndev;
580 skb_reset_mac_header(skb);
581 skb->ip_summed = CHECKSUM_UNNECESSARY;
582 skb->pkt_type = PACKET_OTHERHOST;
583 skb->protocol = htons(ETH_P_802_2);
584 wil_netif_rx_any(skb, ndev);
585 } else {
586 struct ethhdr *eth = (void *)skb->data;
587
588 skb->protocol = eth_type_trans(skb, ndev);
589
590 if (is_unicast_ether_addr(eth->h_dest))
591 wil_rx_reorder(wil, skb);
592 else
593 wil_netif_rx_any(skb, ndev);
594 }
595 }
596 wil_rx_refill(wil, v->size);
597 }
598
599 int wil_rx_init(struct wil6210_priv *wil)
600 {
601 struct vring *vring = &wil->vring_rx;
602 int rc;
603
604 wil_dbg_misc(wil, "%s()\n", __func__);
605
606 if (vring->va) {
607 wil_err(wil, "Rx ring already allocated\n");
608 return -EINVAL;
609 }
610
611 vring->size = WIL6210_RX_RING_SIZE;
612 rc = wil_vring_alloc(wil, vring);
613 if (rc)
614 return rc;
615
616 rc = wmi_rx_chain_add(wil, vring);
617 if (rc)
618 goto err_free;
619
620 rc = wil_rx_refill(wil, vring->size);
621 if (rc)
622 goto err_free;
623
624 return 0;
625 err_free:
626 wil_vring_free(wil, vring, 0);
627
628 return rc;
629 }
630
631 void wil_rx_fini(struct wil6210_priv *wil)
632 {
633 struct vring *vring = &wil->vring_rx;
634
635 wil_dbg_misc(wil, "%s()\n", __func__);
636
637 if (vring->va)
638 wil_vring_free(wil, vring, 0);
639 }
640
641 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
642 int cid, int tid)
643 {
644 int rc;
645 struct wmi_vring_cfg_cmd cmd = {
646 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
647 .vring_cfg = {
648 .tx_sw_ring = {
649 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
650 .ring_size = cpu_to_le16(size),
651 },
652 .ringid = id,
653 .cidxtid = mk_cidxtid(cid, tid),
654 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
655 .mac_ctrl = 0,
656 .to_resolution = 0,
657 .agg_max_wsize = 16,
658 .schd_params = {
659 .priority = cpu_to_le16(0),
660 .timeslot_us = cpu_to_le16(0xfff),
661 },
662 },
663 };
664 struct {
665 struct wil6210_mbox_hdr_wmi wmi;
666 struct wmi_vring_cfg_done_event cmd;
667 } __packed reply;
668 struct vring *vring = &wil->vring_tx[id];
669 struct vring_tx_data *txdata = &wil->vring_tx_data[id];
670
671 wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
672 cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
673
674 if (vring->va) {
675 wil_err(wil, "Tx ring [%d] already allocated\n", id);
676 rc = -EINVAL;
677 goto out;
678 }
679
680 memset(txdata, 0, sizeof(*txdata));
681 vring->size = size;
682 rc = wil_vring_alloc(wil, vring);
683 if (rc)
684 goto out;
685
686 wil->vring2cid_tid[id][0] = cid;
687 wil->vring2cid_tid[id][1] = tid;
688
689 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
690
691 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
692 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
693 if (rc)
694 goto out_free;
695
696 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
697 wil_err(wil, "Tx config failed, status 0x%02x\n",
698 reply.cmd.status);
699 rc = -EINVAL;
700 goto out_free;
701 }
702 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
703
704 txdata->enabled = 1;
705
706 return 0;
707 out_free:
708 wil_vring_free(wil, vring, 1);
709 out:
710
711 return rc;
712 }
713
714 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
715 {
716 struct vring *vring = &wil->vring_tx[id];
717
718 WARN_ON(!mutex_is_locked(&wil->mutex));
719
720 if (!vring->va)
721 return;
722
723 wil_dbg_misc(wil, "%s() id=%d\n", __func__, id);
724
725 /* make sure NAPI won't touch this vring */
726 wil->vring_tx_data[id].enabled = 0;
727 if (test_bit(wil_status_napi_en, &wil->status))
728 napi_synchronize(&wil->napi_tx);
729
730 wil_vring_free(wil, vring, 1);
731 }
732
733 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
734 struct sk_buff *skb)
735 {
736 int i;
737 struct ethhdr *eth = (void *)skb->data;
738 int cid = wil_find_cid(wil, eth->h_dest);
739
740 if (cid < 0)
741 return NULL;
742
743 if (!wil->sta[cid].data_port_open &&
744 (skb->protocol != cpu_to_be16(ETH_P_PAE)))
745 return NULL;
746
747 /* TODO: fix for multiple TID */
748 for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
749 if (wil->vring2cid_tid[i][0] == cid) {
750 struct vring *v = &wil->vring_tx[i];
751
752 wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n",
753 __func__, eth->h_dest, i);
754 if (v->va) {
755 return v;
756 } else {
757 wil_dbg_txrx(wil, "vring[%d] not valid\n", i);
758 return NULL;
759 }
760 }
761 }
762
763 return NULL;
764 }
765
766 static void wil_set_da_for_vring(struct wil6210_priv *wil,
767 struct sk_buff *skb, int vring_index)
768 {
769 struct ethhdr *eth = (void *)skb->data;
770 int cid = wil->vring2cid_tid[vring_index][0];
771
772 memcpy(eth->h_dest, wil->sta[cid].addr, ETH_ALEN);
773 }
774
775 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
776 struct sk_buff *skb);
777 /*
778 * Find 1-st vring and return it; set dest address for this vring in skb
779 * duplicate skb and send it to other active vrings
780 */
781 static struct vring *wil_tx_bcast(struct wil6210_priv *wil,
782 struct sk_buff *skb)
783 {
784 struct vring *v, *v2;
785 struct sk_buff *skb2;
786 int i;
787 u8 cid;
788
789 /* find 1-st vring eligible for data */
790 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
791 v = &wil->vring_tx[i];
792 if (!v->va)
793 continue;
794
795 cid = wil->vring2cid_tid[i][0];
796 if (!wil->sta[cid].data_port_open)
797 continue;
798
799 goto found;
800 }
801
802 wil_dbg_txrx(wil, "Tx while no vrings active?\n");
803
804 return NULL;
805
806 found:
807 wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
808 wil_set_da_for_vring(wil, skb, i);
809
810 /* find other active vrings and duplicate skb for each */
811 for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
812 v2 = &wil->vring_tx[i];
813 if (!v2->va)
814 continue;
815 cid = wil->vring2cid_tid[i][0];
816 if (!wil->sta[cid].data_port_open)
817 continue;
818
819 skb2 = skb_copy(skb, GFP_ATOMIC);
820 if (skb2) {
821 wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
822 wil_set_da_for_vring(wil, skb2, i);
823 wil_tx_vring(wil, v2, skb2);
824 } else {
825 wil_err(wil, "skb_copy failed\n");
826 }
827 }
828
829 return v;
830 }
831
832 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
833 int vring_index)
834 {
835 wil_desc_addr_set(&d->dma.addr, pa);
836 d->dma.ip_length = 0;
837 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
838 d->dma.b11 = 0/*14 | BIT(7)*/;
839 d->dma.error = 0;
840 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
841 d->dma.length = cpu_to_le16((u16)len);
842 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
843 d->mac.d[0] = 0;
844 d->mac.d[1] = 0;
845 d->mac.d[2] = 0;
846 d->mac.ucode_cmd = 0;
847 /* use dst index 0 */
848 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
849 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
850 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
851 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
852 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
853
854 return 0;
855 }
856
857 static inline
858 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
859 {
860 d->mac.d[2] |= ((nr_frags + 1) <<
861 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
862 }
863
864 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
865 struct vring_tx_desc *d,
866 struct sk_buff *skb)
867 {
868 int protocol;
869
870 if (skb->ip_summed != CHECKSUM_PARTIAL)
871 return 0;
872
873 d->dma.b11 = ETH_HLEN; /* MAC header length */
874
875 switch (skb->protocol) {
876 case cpu_to_be16(ETH_P_IP):
877 protocol = ip_hdr(skb)->protocol;
878 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
879 break;
880 case cpu_to_be16(ETH_P_IPV6):
881 protocol = ipv6_hdr(skb)->nexthdr;
882 break;
883 default:
884 return -EINVAL;
885 }
886
887 switch (protocol) {
888 case IPPROTO_TCP:
889 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
890 /* L4 header len: TCP header length */
891 d->dma.d0 |=
892 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
893 break;
894 case IPPROTO_UDP:
895 /* L4 header len: UDP header length */
896 d->dma.d0 |=
897 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
898 break;
899 default:
900 return -EINVAL;
901 }
902
903 d->dma.ip_length = skb_network_header_len(skb);
904 /* Enable TCP/UDP checksum */
905 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
906 /* Calculate pseudo-header */
907 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
908
909 return 0;
910 }
911
912 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
913 struct sk_buff *skb)
914 {
915 struct device *dev = wil_to_dev(wil);
916 struct vring_tx_desc dd, *d = &dd;
917 volatile struct vring_tx_desc *_d;
918 u32 swhead = vring->swhead;
919 int avail = wil_vring_avail_tx(vring);
920 int nr_frags = skb_shinfo(skb)->nr_frags;
921 uint f = 0;
922 int vring_index = vring - wil->vring_tx;
923 struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
924 uint i = swhead;
925 dma_addr_t pa;
926
927 wil_dbg_txrx(wil, "%s()\n", __func__);
928
929 if (avail < 1 + nr_frags) {
930 wil_err(wil, "Tx ring full. No space for %d fragments\n",
931 1 + nr_frags);
932 return -ENOMEM;
933 }
934 _d = &vring->va[i].tx;
935
936 pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
937
938 wil_dbg_txrx(wil, "Tx skb %d bytes 0x%p -> %pad\n", skb_headlen(skb),
939 skb->data, &pa);
940 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
941 skb->data, skb_headlen(skb), false);
942
943 if (unlikely(dma_mapping_error(dev, pa)))
944 return -EINVAL;
945 vring->ctx[i].mapped_as = wil_mapped_as_single;
946 /* 1-st segment */
947 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
948 /* Process TCP/UDP checksum offloading */
949 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
950 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
951 vring_index);
952 goto dma_error;
953 }
954
955 vring->ctx[i].nr_frags = nr_frags;
956 wil_tx_desc_set_nr_frags(d, nr_frags);
957 if (nr_frags)
958 *_d = *d;
959
960 /* middle segments */
961 for (; f < nr_frags; f++) {
962 const struct skb_frag_struct *frag =
963 &skb_shinfo(skb)->frags[f];
964 int len = skb_frag_size(frag);
965
966 i = (swhead + f + 1) % vring->size;
967 _d = &vring->va[i].tx;
968 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
969 DMA_TO_DEVICE);
970 if (unlikely(dma_mapping_error(dev, pa)))
971 goto dma_error;
972 vring->ctx[i].mapped_as = wil_mapped_as_page;
973 wil_tx_desc_map(d, pa, len, vring_index);
974 /* no need to check return code -
975 * if it succeeded for 1-st descriptor,
976 * it will succeed here too
977 */
978 wil_tx_desc_offload_cksum_set(wil, d, skb);
979 *_d = *d;
980 }
981 /* for the last seg only */
982 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
983 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
984 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
985 *_d = *d;
986
987 /* hold reference to skb
988 * to prevent skb release before accounting
989 * in case of immediate "tx done"
990 */
991 vring->ctx[i].skb = skb_get(skb);
992
993 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
994 (const void *)d, sizeof(*d), false);
995
996 if (wil_vring_is_empty(vring)) /* performance monitoring */
997 txdata->idle += get_cycles() - txdata->last_idle;
998
999 /* advance swhead */
1000 wil_vring_advance_head(vring, nr_frags + 1);
1001 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
1002 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
1003 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
1004
1005 return 0;
1006 dma_error:
1007 /* unmap what we have mapped */
1008 nr_frags = f + 1; /* frags mapped + one for skb head */
1009 for (f = 0; f < nr_frags; f++) {
1010 struct wil_ctx *ctx;
1011
1012 i = (swhead + f) % vring->size;
1013 ctx = &vring->ctx[i];
1014 _d = &vring->va[i].tx;
1015 *d = *_d;
1016 _d->dma.status = TX_DMA_STATUS_DU;
1017 wil_txdesc_unmap(dev, d, ctx);
1018
1019 if (ctx->skb)
1020 dev_kfree_skb_any(ctx->skb);
1021
1022 memset(ctx, 0, sizeof(*ctx));
1023 }
1024
1025 return -EINVAL;
1026 }
1027
1028 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1029 {
1030 struct wil6210_priv *wil = ndev_to_wil(ndev);
1031 struct ethhdr *eth = (void *)skb->data;
1032 struct vring *vring;
1033 static bool pr_once_fw;
1034 int rc;
1035
1036 wil_dbg_txrx(wil, "%s()\n", __func__);
1037 if (!test_bit(wil_status_fwready, &wil->status)) {
1038 if (!pr_once_fw) {
1039 wil_err(wil, "FW not ready\n");
1040 pr_once_fw = true;
1041 }
1042 goto drop;
1043 }
1044 if (!test_bit(wil_status_fwconnected, &wil->status)) {
1045 wil_err(wil, "FW not connected\n");
1046 goto drop;
1047 }
1048 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
1049 wil_err(wil, "Xmit in monitor mode not supported\n");
1050 goto drop;
1051 }
1052 pr_once_fw = false;
1053
1054 /* find vring */
1055 if (is_unicast_ether_addr(eth->h_dest))
1056 vring = wil_find_tx_vring(wil, skb);
1057 else
1058 vring = wil_tx_bcast(wil, skb);
1059 if (!vring) {
1060 wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest);
1061 goto drop;
1062 }
1063
1064 /* set up vring entry */
1065 rc = wil_tx_vring(wil, vring, skb);
1066
1067 /* do we still have enough room in the vring? */
1068 if (wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring)) {
1069 netif_tx_stop_all_queues(wil_to_ndev(wil));
1070 wil_dbg_txrx(wil, "netif_tx_stop : ring full\n");
1071 }
1072
1073 switch (rc) {
1074 case 0:
1075 /* statistics will be updated on the tx_complete */
1076 dev_kfree_skb_any(skb);
1077 return NETDEV_TX_OK;
1078 case -ENOMEM:
1079 return NETDEV_TX_BUSY;
1080 default:
1081 break; /* goto drop; */
1082 }
1083 drop:
1084 ndev->stats.tx_dropped++;
1085 dev_kfree_skb_any(skb);
1086
1087 return NET_XMIT_DROP;
1088 }
1089
1090 /**
1091 * Clean up transmitted skb's from the Tx VRING
1092 *
1093 * Return number of descriptors cleared
1094 *
1095 * Safe to call from IRQ
1096 */
1097 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1098 {
1099 struct net_device *ndev = wil_to_ndev(wil);
1100 struct device *dev = wil_to_dev(wil);
1101 struct vring *vring = &wil->vring_tx[ringid];
1102 struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
1103 int done = 0;
1104 int cid = wil->vring2cid_tid[ringid][0];
1105 struct wil_net_stats *stats = &wil->sta[cid].stats;
1106 volatile struct vring_tx_desc *_d;
1107
1108 if (!vring->va) {
1109 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1110 return 0;
1111 }
1112
1113 if (!txdata->enabled) {
1114 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
1115 return 0;
1116 }
1117
1118 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1119
1120 while (!wil_vring_is_empty(vring)) {
1121 int new_swtail;
1122 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1123 /**
1124 * For the fragmented skb, HW will set DU bit only for the
1125 * last fragment. look for it
1126 */
1127 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1128 /* TODO: check we are not past head */
1129
1130 _d = &vring->va[lf].tx;
1131 if (!(_d->dma.status & TX_DMA_STATUS_DU))
1132 break;
1133
1134 new_swtail = (lf + 1) % vring->size;
1135 while (vring->swtail != new_swtail) {
1136 struct vring_tx_desc dd, *d = &dd;
1137 u16 dmalen;
1138 struct sk_buff *skb;
1139
1140 ctx = &vring->ctx[vring->swtail];
1141 skb = ctx->skb;
1142 _d = &vring->va[vring->swtail].tx;
1143
1144 *d = *_d;
1145
1146 dmalen = le16_to_cpu(d->dma.length);
1147 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1148 d->dma.error);
1149 wil_dbg_txrx(wil,
1150 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1151 vring->swtail, dmalen, d->dma.status,
1152 d->dma.error);
1153 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
1154 (const void *)d, sizeof(*d), false);
1155
1156 wil_txdesc_unmap(dev, d, ctx);
1157
1158 if (skb) {
1159 if (d->dma.error == 0) {
1160 ndev->stats.tx_packets++;
1161 stats->tx_packets++;
1162 ndev->stats.tx_bytes += skb->len;
1163 stats->tx_bytes += skb->len;
1164 } else {
1165 ndev->stats.tx_errors++;
1166 stats->tx_errors++;
1167 }
1168
1169 dev_kfree_skb_any(skb);
1170 }
1171 memset(ctx, 0, sizeof(*ctx));
1172 /* There is no need to touch HW descriptor:
1173 * - ststus bit TX_DMA_STATUS_DU is set by design,
1174 * so hardware will not try to process this desc.,
1175 * - rest of descriptor will be initialized on Tx.
1176 */
1177 vring->swtail = wil_vring_next_tail(vring);
1178 done++;
1179 }
1180 }
1181
1182 if (wil_vring_is_empty(vring)) { /* performance monitoring */
1183 wil_dbg_txrx(wil, "Ring[%2d] empty\n", ringid);
1184 txdata->last_idle = get_cycles();
1185 }
1186
1187 if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) {
1188 wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n");
1189 netif_tx_wake_all_queues(wil_to_ndev(wil));
1190 }
1191
1192 return done;
1193 }
Linux with added FPC-III support