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/etherdevice.h>
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
26 static bool rtap_include_phy_info;
27 module_param(rtap_include_phy_info, bool, S_IRUGO);
28 MODULE_PARM_DESC(rtap_include_phy_info,
29 " Include PHY info in the radiotap header, default - no");
30
wil_vring_is_empty(struct vring * vring)31 static inline int wil_vring_is_empty(struct vring *vring)
32 {
33 return vring->swhead == vring->swtail;
34 }
35
wil_vring_next_tail(struct vring * vring)36 static inline u32 wil_vring_next_tail(struct vring *vring)
37 {
38 return (vring->swtail + 1) % vring->size;
39 }
40
wil_vring_advance_head(struct vring * vring,int n)41 static inline void wil_vring_advance_head(struct vring *vring, int n)
42 {
43 vring->swhead = (vring->swhead + n) % vring->size;
44 }
45
wil_vring_is_full(struct vring * vring)46 static 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 */
wil_vring_avail_tx(struct vring * vring)53 static 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
wil_vring_alloc(struct wil6210_priv * wil,struct vring * vring)62 static 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) {
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 kfree(vring->ctx);
84 vring->ctx = NULL;
85 return -ENOMEM;
86 }
87 /* initially, all descriptors are SW owned
88 * For Tx and Rx, ownership bit is at the same location, thus
89 * we can use any
90 */
91 for (i = 0; i < vring->size; i++) {
92 volatile struct vring_tx_desc *d = &(vring->va[i].tx);
93 d->dma.status = TX_DMA_STATUS_DU;
94 }
95
96 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
97 vring->va, (unsigned long long)vring->pa, vring->ctx);
98
99 return 0;
100 }
101
wil_vring_free(struct wil6210_priv * wil,struct vring * vring,int tx)102 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
103 int tx)
104 {
105 struct device *dev = wil_to_dev(wil);
106 size_t sz = vring->size * sizeof(vring->va[0]);
107
108 while (!wil_vring_is_empty(vring)) {
109 if (tx) {
110 volatile struct vring_tx_desc *d =
111 &vring->va[vring->swtail].tx;
112 dma_addr_t pa = d->dma.addr_low |
113 ((u64)d->dma.addr_high << 32);
114 struct sk_buff *skb = vring->ctx[vring->swtail];
115 if (skb) {
116 dma_unmap_single(dev, pa, d->dma.length,
117 DMA_TO_DEVICE);
118 dev_kfree_skb_any(skb);
119 vring->ctx[vring->swtail] = NULL;
120 } else {
121 dma_unmap_page(dev, pa, d->dma.length,
122 DMA_TO_DEVICE);
123 }
124 vring->swtail = wil_vring_next_tail(vring);
125 } else { /* rx */
126 volatile struct vring_rx_desc *d =
127 &vring->va[vring->swtail].rx;
128 dma_addr_t pa = d->dma.addr_low |
129 ((u64)d->dma.addr_high << 32);
130 struct sk_buff *skb = vring->ctx[vring->swhead];
131 dma_unmap_single(dev, pa, d->dma.length,
132 DMA_FROM_DEVICE);
133 kfree_skb(skb);
134 wil_vring_advance_head(vring, 1);
135 }
136 }
137 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
138 kfree(vring->ctx);
139 vring->pa = 0;
140 vring->va = NULL;
141 vring->ctx = NULL;
142 }
143
144 /**
145 * Allocate one skb for Rx VRING
146 *
147 * Safe to call from IRQ
148 */
wil_vring_alloc_skb(struct wil6210_priv * wil,struct vring * vring,u32 i,int headroom)149 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
150 u32 i, int headroom)
151 {
152 struct device *dev = wil_to_dev(wil);
153 unsigned int sz = RX_BUF_LEN;
154 volatile struct vring_rx_desc *d = &(vring->va[i].rx);
155 dma_addr_t pa;
156
157 /* TODO align */
158 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
159 if (unlikely(!skb))
160 return -ENOMEM;
161
162 skb_reserve(skb, headroom);
163 skb_put(skb, sz);
164
165 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
166 if (unlikely(dma_mapping_error(dev, pa))) {
167 kfree_skb(skb);
168 return -ENOMEM;
169 }
170
171 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
172 d->dma.addr_low = lower_32_bits(pa);
173 d->dma.addr_high = (u16)upper_32_bits(pa);
174 /* ip_length don't care */
175 /* b11 don't care */
176 /* error don't care */
177 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
178 d->dma.length = sz;
179 vring->ctx[i] = skb;
180
181 return 0;
182 }
183
184 /**
185 * Adds radiotap header
186 *
187 * Any error indicated as "Bad FCS"
188 *
189 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
190 * - Rx descriptor: 32 bytes
191 * - Phy info
192 */
wil_rx_add_radiotap_header(struct wil6210_priv * wil,struct sk_buff * skb)193 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
194 struct sk_buff *skb)
195 {
196 struct wireless_dev *wdev = wil->wdev;
197 struct wil6210_rtap {
198 struct ieee80211_radiotap_header rthdr;
199 /* fields should be in the order of bits in rthdr.it_present */
200 /* flags */
201 u8 flags;
202 /* channel */
203 __le16 chnl_freq __aligned(2);
204 __le16 chnl_flags;
205 /* MCS */
206 u8 mcs_present;
207 u8 mcs_flags;
208 u8 mcs_index;
209 } __packed;
210 struct wil6210_rtap_vendor {
211 struct wil6210_rtap rtap;
212 /* vendor */
213 u8 vendor_oui[3] __aligned(2);
214 u8 vendor_ns;
215 __le16 vendor_skip;
216 u8 vendor_data[0];
217 } __packed;
218 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
219 struct wil6210_rtap_vendor *rtap_vendor;
220 int rtap_len = sizeof(struct wil6210_rtap);
221 int phy_length = 0; /* phy info header size, bytes */
222 static char phy_data[128];
223 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
224
225 if (rtap_include_phy_info) {
226 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
227 /* calculate additional length */
228 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
229 /**
230 * PHY info starts from 8-byte boundary
231 * there are 8-byte lines, last line may be partially
232 * written (HW bug), thus FW configures for last line
233 * to be excessive. Driver skips this last line.
234 */
235 int len = min_t(int, 8 + sizeof(phy_data),
236 wil_rxdesc_phy_length(d));
237 if (len > 8) {
238 void *p = skb_tail_pointer(skb);
239 void *pa = PTR_ALIGN(p, 8);
240 if (skb_tailroom(skb) >= len + (pa - p)) {
241 phy_length = len - 8;
242 memcpy(phy_data, pa, phy_length);
243 }
244 }
245 }
246 rtap_len += phy_length;
247 }
248
249 if (skb_headroom(skb) < rtap_len &&
250 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
251 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
252 return;
253 }
254
255 rtap_vendor = (void *)skb_push(skb, rtap_len);
256 memset(rtap_vendor, 0, rtap_len);
257
258 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
259 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
260 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
261 (1 << IEEE80211_RADIOTAP_FLAGS) |
262 (1 << IEEE80211_RADIOTAP_CHANNEL) |
263 (1 << IEEE80211_RADIOTAP_MCS));
264 if (d->dma.status & RX_DMA_STATUS_ERROR)
265 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
266
267 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
268 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
269
270 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
271 rtap_vendor->rtap.mcs_flags = 0;
272 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
273
274 if (rtap_include_phy_info) {
275 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
276 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
277 /* OUI for Wilocity 04:ce:14 */
278 rtap_vendor->vendor_oui[0] = 0x04;
279 rtap_vendor->vendor_oui[1] = 0xce;
280 rtap_vendor->vendor_oui[2] = 0x14;
281 rtap_vendor->vendor_ns = 1;
282 /* Rx descriptor + PHY data */
283 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
284 phy_length);
285 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
286 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
287 phy_length);
288 }
289 }
290
291 /*
292 * Fast swap in place between 2 registers
293 */
wil_swap_u16(u16 * a,u16 * b)294 static void wil_swap_u16(u16 *a, u16 *b)
295 {
296 *a ^= *b;
297 *b ^= *a;
298 *a ^= *b;
299 }
300
wil_swap_ethaddr(void * data)301 static void wil_swap_ethaddr(void *data)
302 {
303 struct ethhdr *eth = data;
304 u16 *s = (u16 *)eth->h_source;
305 u16 *d = (u16 *)eth->h_dest;
306
307 wil_swap_u16(s++, d++);
308 wil_swap_u16(s++, d++);
309 wil_swap_u16(s, d);
310 }
311
312 /**
313 * reap 1 frame from @swhead
314 *
315 * Rx descriptor copied to skb->cb
316 *
317 * Safe to call from IRQ
318 */
wil_vring_reap_rx(struct wil6210_priv * wil,struct vring * vring)319 static 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 vring_rx_desc *d1;
326 struct sk_buff *skb;
327 dma_addr_t pa;
328 unsigned int sz = RX_BUF_LEN;
329 u8 ftype;
330 u8 ds_bits;
331
332 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
333
334 if (wil_vring_is_empty(vring))
335 return NULL;
336
337 d = &(vring->va[vring->swhead].rx);
338 if (!(d->dma.status & RX_DMA_STATUS_DU)) {
339 /* it is not error, we just reached end of Rx done area */
340 return NULL;
341 }
342
343 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
344 skb = vring->ctx[vring->swhead];
345 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
346 skb_trim(skb, d->dma.length);
347
348 d1 = wil_skb_rxdesc(skb);
349 *d1 = *d;
350
351 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d1);
352
353 /* use radiotap header only if required */
354 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
355 wil_rx_add_radiotap_header(wil, skb);
356
357 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length);
358 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
359 (const void *)d, sizeof(*d), false);
360
361 wil_vring_advance_head(vring, 1);
362
363 /* no extra checks if in sniffer mode */
364 if (ndev->type != ARPHRD_ETHER)
365 return skb;
366 /*
367 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
368 * Driver should recognize it by frame type, that is found
369 * in Rx descriptor. If type is not data, it is 802.11 frame as is
370 */
371 ftype = wil_rxdesc_ftype(d1) << 2;
372 if (ftype != IEEE80211_FTYPE_DATA) {
373 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
374 /* TODO: process it */
375 kfree_skb(skb);
376 return NULL;
377 }
378
379 if (skb->len < ETH_HLEN) {
380 wil_err(wil, "Short frame, len = %d\n", skb->len);
381 /* TODO: process it (i.e. BAR) */
382 kfree_skb(skb);
383 return NULL;
384 }
385
386 ds_bits = wil_rxdesc_ds_bits(d1);
387 if (ds_bits == 1) {
388 /*
389 * HW bug - in ToDS mode, i.e. Rx on AP side,
390 * addresses get swapped
391 */
392 wil_swap_ethaddr(skb->data);
393 }
394
395 return skb;
396 }
397
398 /**
399 * allocate and fill up to @count buffers in rx ring
400 * buffers posted at @swtail
401 */
wil_rx_refill(struct wil6210_priv * wil,int count)402 static int wil_rx_refill(struct wil6210_priv *wil, int count)
403 {
404 struct net_device *ndev = wil_to_ndev(wil);
405 struct vring *v = &wil->vring_rx;
406 u32 next_tail;
407 int rc = 0;
408 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
409 WIL6210_RTAP_SIZE : 0;
410
411 for (; next_tail = wil_vring_next_tail(v),
412 (next_tail != v->swhead) && (count-- > 0);
413 v->swtail = next_tail) {
414 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
415 if (rc) {
416 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
417 rc, v->swtail);
418 break;
419 }
420 }
421 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
422
423 return rc;
424 }
425
426 /*
427 * Pass Rx packet to the netif. Update statistics.
428 */
wil_netif_rx_any(struct sk_buff * skb,struct net_device * ndev)429 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
430 {
431 int rc;
432 unsigned int len = skb->len;
433
434 skb_orphan(skb);
435
436 if (in_interrupt())
437 rc = netif_rx(skb);
438 else
439 rc = netif_rx_ni(skb);
440
441 if (likely(rc == NET_RX_SUCCESS)) {
442 ndev->stats.rx_packets++;
443 ndev->stats.rx_bytes += len;
444
445 } else {
446 ndev->stats.rx_dropped++;
447 }
448 }
449
450 /**
451 * Proceed all completed skb's from Rx VRING
452 *
453 * Safe to call from IRQ
454 */
wil_rx_handle(struct wil6210_priv * wil)455 void wil_rx_handle(struct wil6210_priv *wil)
456 {
457 struct net_device *ndev = wil_to_ndev(wil);
458 struct vring *v = &wil->vring_rx;
459 struct sk_buff *skb;
460
461 if (!v->va) {
462 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
463 return;
464 }
465 wil_dbg_txrx(wil, "%s()\n", __func__);
466 while (NULL != (skb = wil_vring_reap_rx(wil, v))) {
467 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
468 skb->data, skb_headlen(skb), false);
469
470 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
471 skb->dev = ndev;
472 skb_reset_mac_header(skb);
473 skb->ip_summed = CHECKSUM_UNNECESSARY;
474 skb->pkt_type = PACKET_OTHERHOST;
475 skb->protocol = htons(ETH_P_802_2);
476
477 } else {
478 skb->protocol = eth_type_trans(skb, ndev);
479 }
480
481 wil_netif_rx_any(skb, ndev);
482 }
483 wil_rx_refill(wil, v->size);
484 }
485
wil_rx_init(struct wil6210_priv * wil)486 int wil_rx_init(struct wil6210_priv *wil)
487 {
488 struct vring *vring = &wil->vring_rx;
489 int rc;
490
491 vring->size = WIL6210_RX_RING_SIZE;
492 rc = wil_vring_alloc(wil, vring);
493 if (rc)
494 return rc;
495
496 rc = wmi_rx_chain_add(wil, vring);
497 if (rc)
498 goto err_free;
499
500 rc = wil_rx_refill(wil, vring->size);
501 if (rc)
502 goto err_free;
503
504 return 0;
505 err_free:
506 wil_vring_free(wil, vring, 0);
507
508 return rc;
509 }
510
wil_rx_fini(struct wil6210_priv * wil)511 void wil_rx_fini(struct wil6210_priv *wil)
512 {
513 struct vring *vring = &wil->vring_rx;
514
515 if (vring->va)
516 wil_vring_free(wil, vring, 0);
517 }
518
wil_vring_init_tx(struct wil6210_priv * wil,int id,int size,int cid,int tid)519 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
520 int cid, int tid)
521 {
522 int rc;
523 struct wmi_vring_cfg_cmd cmd = {
524 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
525 .vring_cfg = {
526 .tx_sw_ring = {
527 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
528 .ring_size = cpu_to_le16(size),
529 },
530 .ringid = id,
531 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
532 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
533 .mac_ctrl = 0,
534 .to_resolution = 0,
535 .agg_max_wsize = 16,
536 .schd_params = {
537 .priority = cpu_to_le16(0),
538 .timeslot_us = cpu_to_le16(0xfff),
539 },
540 },
541 };
542 struct {
543 struct wil6210_mbox_hdr_wmi wmi;
544 struct wmi_vring_cfg_done_event cmd;
545 } __packed reply;
546 struct vring *vring = &wil->vring_tx[id];
547
548 if (vring->va) {
549 wil_err(wil, "Tx ring [%d] already allocated\n", id);
550 rc = -EINVAL;
551 goto out;
552 }
553
554 vring->size = size;
555 rc = wil_vring_alloc(wil, vring);
556 if (rc)
557 goto out;
558
559 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
560
561 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
562 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
563 if (rc)
564 goto out_free;
565
566 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
567 wil_err(wil, "Tx config failed, status 0x%02x\n",
568 reply.cmd.status);
569 rc = -EINVAL;
570 goto out_free;
571 }
572 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
573
574 return 0;
575 out_free:
576 wil_vring_free(wil, vring, 1);
577 out:
578
579 return rc;
580 }
581
wil_vring_fini_tx(struct wil6210_priv * wil,int id)582 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
583 {
584 struct vring *vring = &wil->vring_tx[id];
585
586 if (!vring->va)
587 return;
588
589 wil_vring_free(wil, vring, 1);
590 }
591
wil_find_tx_vring(struct wil6210_priv * wil,struct sk_buff * skb)592 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
593 struct sk_buff *skb)
594 {
595 struct vring *v = &wil->vring_tx[0];
596
597 if (v->va)
598 return v;
599
600 return NULL;
601 }
602
wil_tx_desc_map(volatile struct vring_tx_desc * d,dma_addr_t pa,u32 len)603 static int wil_tx_desc_map(volatile struct vring_tx_desc *d,
604 dma_addr_t pa, u32 len)
605 {
606 d->dma.addr_low = lower_32_bits(pa);
607 d->dma.addr_high = (u16)upper_32_bits(pa);
608 d->dma.ip_length = 0;
609 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
610 d->dma.b11 = 0/*14 | BIT(7)*/;
611 d->dma.error = 0;
612 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
613 d->dma.length = len;
614 d->dma.d0 = 0;
615 d->mac.d[0] = 0;
616 d->mac.d[1] = 0;
617 d->mac.d[2] = 0;
618 d->mac.ucode_cmd = 0;
619 /* use dst index 0 */
620 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
621 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
622 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
623 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
624 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
625
626 return 0;
627 }
628
wil_tx_vring(struct wil6210_priv * wil,struct vring * vring,struct sk_buff * skb)629 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
630 struct sk_buff *skb)
631 {
632 struct device *dev = wil_to_dev(wil);
633 volatile struct vring_tx_desc *d;
634 u32 swhead = vring->swhead;
635 int avail = wil_vring_avail_tx(vring);
636 int nr_frags = skb_shinfo(skb)->nr_frags;
637 uint f;
638 int vring_index = vring - wil->vring_tx;
639 uint i = swhead;
640 dma_addr_t pa;
641
642 wil_dbg_txrx(wil, "%s()\n", __func__);
643
644 if (avail < vring->size/8)
645 netif_tx_stop_all_queues(wil_to_ndev(wil));
646 if (avail < 1 + nr_frags) {
647 wil_err(wil, "Tx ring full. No space for %d fragments\n",
648 1 + nr_frags);
649 return -ENOMEM;
650 }
651 d = &(vring->va[i].tx);
652
653 /* FIXME FW can accept only unicast frames for the peer */
654 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
655
656 pa = dma_map_single(dev, skb->data,
657 skb_headlen(skb), DMA_TO_DEVICE);
658
659 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
660 skb->data, (unsigned long long)pa);
661 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
662 skb->data, skb_headlen(skb), false);
663
664 if (unlikely(dma_mapping_error(dev, pa)))
665 return -EINVAL;
666 /* 1-st segment */
667 wil_tx_desc_map(d, pa, skb_headlen(skb));
668 d->mac.d[2] |= ((nr_frags + 1) <<
669 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
670 /* middle segments */
671 for (f = 0; f < nr_frags; f++) {
672 const struct skb_frag_struct *frag =
673 &skb_shinfo(skb)->frags[f];
674 int len = skb_frag_size(frag);
675 i = (swhead + f + 1) % vring->size;
676 d = &(vring->va[i].tx);
677 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
678 DMA_TO_DEVICE);
679 if (unlikely(dma_mapping_error(dev, pa)))
680 goto dma_error;
681 wil_tx_desc_map(d, pa, len);
682 vring->ctx[i] = NULL;
683 }
684 /* for the last seg only */
685 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
686 d->dma.d0 |= BIT(9); /* BUG: undocumented bit */
687 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
688 d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
689
690 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
691 (const void *)d, sizeof(*d), false);
692
693 /* advance swhead */
694 wil_vring_advance_head(vring, nr_frags + 1);
695 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
696 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
697 /* hold reference to skb
698 * to prevent skb release before accounting
699 * in case of immediate "tx done"
700 */
701 vring->ctx[i] = skb_get(skb);
702
703 return 0;
704 dma_error:
705 /* unmap what we have mapped */
706 /* Note: increment @f to operate with positive index */
707 for (f++; f > 0; f--) {
708 i = (swhead + f) % vring->size;
709 d = &(vring->va[i].tx);
710 d->dma.status = TX_DMA_STATUS_DU;
711 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
712 if (vring->ctx[i])
713 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
714 else
715 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
716 }
717
718 return -EINVAL;
719 }
720
721
wil_start_xmit(struct sk_buff * skb,struct net_device * ndev)722 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
723 {
724 struct wil6210_priv *wil = ndev_to_wil(ndev);
725 struct vring *vring;
726 int rc;
727
728 wil_dbg_txrx(wil, "%s()\n", __func__);
729 if (!test_bit(wil_status_fwready, &wil->status)) {
730 wil_err(wil, "FW not ready\n");
731 goto drop;
732 }
733 if (!test_bit(wil_status_fwconnected, &wil->status)) {
734 wil_err(wil, "FW not connected\n");
735 goto drop;
736 }
737 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
738 wil_err(wil, "Xmit in monitor mode not supported\n");
739 goto drop;
740 }
741 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
742 rc = wmi_tx_eapol(wil, skb);
743 } else {
744 /* find vring */
745 vring = wil_find_tx_vring(wil, skb);
746 if (!vring) {
747 wil_err(wil, "No Tx VRING available\n");
748 goto drop;
749 }
750 /* set up vring entry */
751 rc = wil_tx_vring(wil, vring, skb);
752 }
753 switch (rc) {
754 case 0:
755 /* statistics will be updated on the tx_complete */
756 dev_kfree_skb_any(skb);
757 return NETDEV_TX_OK;
758 case -ENOMEM:
759 return NETDEV_TX_BUSY;
760 default:
761 break; /* goto drop; */
762 }
763 drop:
764 netif_tx_stop_all_queues(ndev);
765 ndev->stats.tx_dropped++;
766 dev_kfree_skb_any(skb);
767
768 return NET_XMIT_DROP;
769 }
770
771 /**
772 * Clean up transmitted skb's from the Tx VRING
773 *
774 * Safe to call from IRQ
775 */
wil_tx_complete(struct wil6210_priv * wil,int ringid)776 void wil_tx_complete(struct wil6210_priv *wil, int ringid)
777 {
778 struct net_device *ndev = wil_to_ndev(wil);
779 struct device *dev = wil_to_dev(wil);
780 struct vring *vring = &wil->vring_tx[ringid];
781
782 if (!vring->va) {
783 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
784 return;
785 }
786
787 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
788
789 while (!wil_vring_is_empty(vring)) {
790 volatile struct vring_tx_desc *d1 =
791 &vring->va[vring->swtail].tx;
792 struct vring_tx_desc dd, *d = ⅆ
793 dma_addr_t pa;
794 struct sk_buff *skb;
795
796 dd = *d1;
797
798 if (!(d->dma.status & TX_DMA_STATUS_DU))
799 break;
800
801 wil_dbg_txrx(wil,
802 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
803 vring->swtail, d->dma.length, d->dma.status,
804 d->dma.error);
805 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
806 (const void *)d, sizeof(*d), false);
807
808 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
809 skb = vring->ctx[vring->swtail];
810 if (skb) {
811 if (d->dma.error == 0) {
812 ndev->stats.tx_packets++;
813 ndev->stats.tx_bytes += skb->len;
814 } else {
815 ndev->stats.tx_errors++;
816 }
817
818 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
819 dev_kfree_skb_any(skb);
820 vring->ctx[vring->swtail] = NULL;
821 } else {
822 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
823 }
824 d->dma.addr_low = 0;
825 d->dma.addr_high = 0;
826 d->dma.length = 0;
827 d->dma.status = TX_DMA_STATUS_DU;
828 vring->swtail = wil_vring_next_tail(vring);
829 }
830 if (wil_vring_avail_tx(vring) > vring->size/4)
831 netif_tx_wake_all_queues(wil_to_ndev(wil));
832 }
833