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ARM: mm: Recreate kernel mappings in early_paging_init()
[linux/fpc-iii.git] / drivers / net / wireless / ath / wil6210 / txrx.c
blobd505b2676a736381366652e6815891286e6fe319
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 #include <linux/ip.h>
22 #include <linux/ipv6.h>
23 #include <net/ipv6.h>
24
25 #include "wil6210.h"
26 #include "wmi.h"
27 #include "txrx.h"
28 #include "trace.h"
29
30 static bool rtap_include_phy_info;
31 module_param(rtap_include_phy_info, bool, S_IRUGO);
32 MODULE_PARM_DESC(rtap_include_phy_info,
33 " Include PHY info in the radiotap header, default - no");
34
35 static inline int wil_vring_is_empty(struct vring *vring)
36 {
37 return vring->swhead == vring->swtail;
38 }
39
40 static inline u32 wil_vring_next_tail(struct vring *vring)
41 {
42 return (vring->swtail + 1) % vring->size;
43 }
44
45 static inline void wil_vring_advance_head(struct vring *vring, int n)
46 {
47 vring->swhead = (vring->swhead + n) % vring->size;
48 }
49
50 static inline int wil_vring_is_full(struct vring *vring)
51 {
52 return wil_vring_next_tail(vring) == vring->swhead;
53 }
54 /*
55 * Available space in Tx Vring
56 */
57 static inline int wil_vring_avail_tx(struct vring *vring)
58 {
59 u32 swhead = vring->swhead;
60 u32 swtail = vring->swtail;
61 int used = (vring->size + swhead - swtail) % vring->size;
62
63 return vring->size - used - 1;
64 }
65
66 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
67 {
68 struct device *dev = wil_to_dev(wil);
69 size_t sz = vring->size * sizeof(vring->va[0]);
70 uint i;
71
72 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
73
74 vring->swhead = 0;
75 vring->swtail = 0;
76 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
77 if (!vring->ctx) {
78 vring->va = NULL;
79 return -ENOMEM;
80 }
81 /*
82 * vring->va should be aligned on its size rounded up to power of 2
83 * This is granted by the dma_alloc_coherent
84 */
85 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
86 if (!vring->va) {
87 kfree(vring->ctx);
88 vring->ctx = NULL;
89 return -ENOMEM;
90 }
91 /* initially, all descriptors are SW owned
92 * For Tx and Rx, ownership bit is at the same location, thus
93 * we can use any
94 */
95 for (i = 0; i < vring->size; i++) {
96 volatile struct vring_tx_desc *_d = &(vring->va[i].tx);
97 _d->dma.status = TX_DMA_STATUS_DU;
98 }
99
100 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
101 vring->va, (unsigned long long)vring->pa, vring->ctx);
102
103 return 0;
104 }
105
106 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
107 int tx)
108 {
109 struct device *dev = wil_to_dev(wil);
110 size_t sz = vring->size * sizeof(vring->va[0]);
111
112 while (!wil_vring_is_empty(vring)) {
113 dma_addr_t pa;
114 u16 dmalen;
115 struct wil_ctx *ctx;
116
117 if (tx) {
118 struct vring_tx_desc dd, *d = &dd;
119 volatile struct vring_tx_desc *_d =
120 &vring->va[vring->swtail].tx;
121
122 ctx = &vring->ctx[vring->swtail];
123 *d = *_d;
124 pa = wil_desc_addr(&d->dma.addr);
125 dmalen = le16_to_cpu(d->dma.length);
126 if (vring->ctx[vring->swtail].mapped_as_page) {
127 dma_unmap_page(dev, pa, dmalen,
128 DMA_TO_DEVICE);
129 } else {
130 dma_unmap_single(dev, pa, dmalen,
131 DMA_TO_DEVICE);
132 }
133 if (ctx->skb)
134 dev_kfree_skb_any(ctx->skb);
135 vring->swtail = wil_vring_next_tail(vring);
136 } else { /* rx */
137 struct vring_rx_desc dd, *d = &dd;
138 volatile struct vring_rx_desc *_d =
139 &vring->va[vring->swhead].rx;
140
141 ctx = &vring->ctx[vring->swhead];
142 *d = *_d;
143 pa = wil_desc_addr(&d->dma.addr);
144 dmalen = le16_to_cpu(d->dma.length);
145 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
146 kfree_skb(ctx->skb);
147 wil_vring_advance_head(vring, 1);
148 }
149 }
150 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
151 kfree(vring->ctx);
152 vring->pa = 0;
153 vring->va = NULL;
154 vring->ctx = NULL;
155 }
156
157 /**
158 * Allocate one skb for Rx VRING
159 *
160 * Safe to call from IRQ
161 */
162 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
163 u32 i, int headroom)
164 {
165 struct device *dev = wil_to_dev(wil);
166 unsigned int sz = RX_BUF_LEN;
167 struct vring_rx_desc dd, *d = &dd;
168 volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
169 dma_addr_t pa;
170
171 /* TODO align */
172 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
173 if (unlikely(!skb))
174 return -ENOMEM;
175
176 skb_reserve(skb, headroom);
177 skb_put(skb, sz);
178
179 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
180 if (unlikely(dma_mapping_error(dev, pa))) {
181 kfree_skb(skb);
182 return -ENOMEM;
183 }
184
185 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
186 wil_desc_addr_set(&d->dma.addr, pa);
187 /* ip_length don't care */
188 /* b11 don't care */
189 /* error don't care */
190 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
191 d->dma.length = cpu_to_le16(sz);
192 *_d = *d;
193 vring->ctx[i].skb = skb;
194
195 return 0;
196 }
197
198 /**
199 * Adds radiotap header
200 *
201 * Any error indicated as "Bad FCS"
202 *
203 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
204 * - Rx descriptor: 32 bytes
205 * - Phy info
206 */
207 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
208 struct sk_buff *skb)
209 {
210 struct wireless_dev *wdev = wil->wdev;
211 struct wil6210_rtap {
212 struct ieee80211_radiotap_header rthdr;
213 /* fields should be in the order of bits in rthdr.it_present */
214 /* flags */
215 u8 flags;
216 /* channel */
217 __le16 chnl_freq __aligned(2);
218 __le16 chnl_flags;
219 /* MCS */
220 u8 mcs_present;
221 u8 mcs_flags;
222 u8 mcs_index;
223 } __packed;
224 struct wil6210_rtap_vendor {
225 struct wil6210_rtap rtap;
226 /* vendor */
227 u8 vendor_oui[3] __aligned(2);
228 u8 vendor_ns;
229 __le16 vendor_skip;
230 u8 vendor_data[0];
231 } __packed;
232 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
233 struct wil6210_rtap_vendor *rtap_vendor;
234 int rtap_len = sizeof(struct wil6210_rtap);
235 int phy_length = 0; /* phy info header size, bytes */
236 static char phy_data[128];
237 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
238
239 if (rtap_include_phy_info) {
240 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
241 /* calculate additional length */
242 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
243 /**
244 * PHY info starts from 8-byte boundary
245 * there are 8-byte lines, last line may be partially
246 * written (HW bug), thus FW configures for last line
247 * to be excessive. Driver skips this last line.
248 */
249 int len = min_t(int, 8 + sizeof(phy_data),
250 wil_rxdesc_phy_length(d));
251 if (len > 8) {
252 void *p = skb_tail_pointer(skb);
253 void *pa = PTR_ALIGN(p, 8);
254 if (skb_tailroom(skb) >= len + (pa - p)) {
255 phy_length = len - 8;
256 memcpy(phy_data, pa, phy_length);
257 }
258 }
259 }
260 rtap_len += phy_length;
261 }
262
263 if (skb_headroom(skb) < rtap_len &&
264 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
265 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
266 return;
267 }
268
269 rtap_vendor = (void *)skb_push(skb, rtap_len);
270 memset(rtap_vendor, 0, rtap_len);
271
272 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
273 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
274 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
275 (1 << IEEE80211_RADIOTAP_FLAGS) |
276 (1 << IEEE80211_RADIOTAP_CHANNEL) |
277 (1 << IEEE80211_RADIOTAP_MCS));
278 if (d->dma.status & RX_DMA_STATUS_ERROR)
279 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
280
281 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
282 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
283
284 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
285 rtap_vendor->rtap.mcs_flags = 0;
286 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
287
288 if (rtap_include_phy_info) {
289 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
290 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
291 /* OUI for Wilocity 04:ce:14 */
292 rtap_vendor->vendor_oui[0] = 0x04;
293 rtap_vendor->vendor_oui[1] = 0xce;
294 rtap_vendor->vendor_oui[2] = 0x14;
295 rtap_vendor->vendor_ns = 1;
296 /* Rx descriptor + PHY data */
297 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
298 phy_length);
299 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
300 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
301 phy_length);
302 }
303 }
304
305 /*
306 * Fast swap in place between 2 registers
307 */
308 static void wil_swap_u16(u16 *a, u16 *b)
309 {
310 *a ^= *b;
311 *b ^= *a;
312 *a ^= *b;
313 }
314
315 static void wil_swap_ethaddr(void *data)
316 {
317 struct ethhdr *eth = data;
318 u16 *s = (u16 *)eth->h_source;
319 u16 *d = (u16 *)eth->h_dest;
320
321 wil_swap_u16(s++, d++);
322 wil_swap_u16(s++, d++);
323 wil_swap_u16(s, d);
324 }
325
326 /**
327 * reap 1 frame from @swhead
328 *
329 * Rx descriptor copied to skb->cb
330 *
331 * Safe to call from IRQ
332 */
333 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
334 struct vring *vring)
335 {
336 struct device *dev = wil_to_dev(wil);
337 struct net_device *ndev = wil_to_ndev(wil);
338 volatile struct vring_rx_desc *_d;
339 struct vring_rx_desc *d;
340 struct sk_buff *skb;
341 dma_addr_t pa;
342 unsigned int sz = RX_BUF_LEN;
343 u16 dmalen;
344 u8 ftype;
345 u8 ds_bits;
346
347 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
348
349 if (wil_vring_is_empty(vring))
350 return NULL;
351
352 _d = &(vring->va[vring->swhead].rx);
353 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
354 /* it is not error, we just reached end of Rx done area */
355 return NULL;
356 }
357
358 skb = vring->ctx[vring->swhead].skb;
359 d = wil_skb_rxdesc(skb);
360 *d = *_d;
361 pa = wil_desc_addr(&d->dma.addr);
362 vring->ctx[vring->swhead].skb = NULL;
363 wil_vring_advance_head(vring, 1);
364
365 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
366 dmalen = le16_to_cpu(d->dma.length);
367
368 trace_wil6210_rx(vring->swhead, d);
369 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
370 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
371 (const void *)d, sizeof(*d), false);
372
373 if (dmalen > sz) {
374 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
375 kfree_skb(skb);
376 return NULL;
377 }
378 skb_trim(skb, dmalen);
379
380 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
381 skb->data, skb_headlen(skb), false);
382
383
384 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
385
386 /* use radiotap header only if required */
387 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
388 wil_rx_add_radiotap_header(wil, skb);
389
390 /* no extra checks if in sniffer mode */
391 if (ndev->type != ARPHRD_ETHER)
392 return skb;
393 /*
394 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
395 * Driver should recognize it by frame type, that is found
396 * in Rx descriptor. If type is not data, it is 802.11 frame as is
397 */
398 ftype = wil_rxdesc_ftype(d) << 2;
399 if (ftype != IEEE80211_FTYPE_DATA) {
400 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
401 /* TODO: process it */
402 kfree_skb(skb);
403 return NULL;
404 }
405
406 if (skb->len < ETH_HLEN) {
407 wil_err(wil, "Short frame, len = %d\n", skb->len);
408 /* TODO: process it (i.e. BAR) */
409 kfree_skb(skb);
410 return NULL;
411 }
412
413 /* L4 IDENT is on when HW calculated checksum, check status
414 * and in case of error drop the packet
415 * higher stack layers will handle retransmission (if required)
416 */
417 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
418 /* L4 protocol identified, csum calculated */
419 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
420 skb->ip_summed = CHECKSUM_UNNECESSARY;
421 /* If HW reports bad checksum, let IP stack re-check it
422 * For example, HW don't understand Microsoft IP stack that
423 * mis-calculates TCP checksum - if it should be 0x0,
424 * it writes 0xffff in violation of RFC 1624
425 */
426 }
427
428 ds_bits = wil_rxdesc_ds_bits(d);
429 if (ds_bits == 1) {
430 /*
431 * HW bug - in ToDS mode, i.e. Rx on AP side,
432 * addresses get swapped
433 */
434 wil_swap_ethaddr(skb->data);
435 }
436
437 return skb;
438 }
439
440 /**
441 * allocate and fill up to @count buffers in rx ring
442 * buffers posted at @swtail
443 */
444 static int wil_rx_refill(struct wil6210_priv *wil, int count)
445 {
446 struct net_device *ndev = wil_to_ndev(wil);
447 struct vring *v = &wil->vring_rx;
448 u32 next_tail;
449 int rc = 0;
450 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
451 WIL6210_RTAP_SIZE : 0;
452
453 for (; next_tail = wil_vring_next_tail(v),
454 (next_tail != v->swhead) && (count-- > 0);
455 v->swtail = next_tail) {
456 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
457 if (rc) {
458 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
459 rc, v->swtail);
460 break;
461 }
462 }
463 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
464
465 return rc;
466 }
467
468 /*
469 * Pass Rx packet to the netif. Update statistics.
470 * Called in softirq context (NAPI poll).
471 */
472 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
473 {
474 int rc;
475 unsigned int len = skb->len;
476
477 skb_orphan(skb);
478
479 rc = netif_receive_skb(skb);
480
481 if (likely(rc == NET_RX_SUCCESS)) {
482 ndev->stats.rx_packets++;
483 ndev->stats.rx_bytes += len;
484
485 } else {
486 ndev->stats.rx_dropped++;
487 }
488 }
489
490 /**
491 * Proceed all completed skb's from Rx VRING
492 *
493 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
494 */
495 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
496 {
497 struct net_device *ndev = wil_to_ndev(wil);
498 struct vring *v = &wil->vring_rx;
499 struct sk_buff *skb;
500
501 if (!v->va) {
502 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
503 return;
504 }
505 wil_dbg_txrx(wil, "%s()\n", __func__);
506 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
507 (*quota)--;
508
509 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
510 skb->dev = ndev;
511 skb_reset_mac_header(skb);
512 skb->ip_summed = CHECKSUM_UNNECESSARY;
513 skb->pkt_type = PACKET_OTHERHOST;
514 skb->protocol = htons(ETH_P_802_2);
515
516 } else {
517 skb->protocol = eth_type_trans(skb, ndev);
518 }
519
520 wil_netif_rx_any(skb, ndev);
521 }
522 wil_rx_refill(wil, v->size);
523 }
524
525 int wil_rx_init(struct wil6210_priv *wil)
526 {
527 struct vring *vring = &wil->vring_rx;
528 int rc;
529
530 vring->size = WIL6210_RX_RING_SIZE;
531 rc = wil_vring_alloc(wil, vring);
532 if (rc)
533 return rc;
534
535 rc = wmi_rx_chain_add(wil, vring);
536 if (rc)
537 goto err_free;
538
539 rc = wil_rx_refill(wil, vring->size);
540 if (rc)
541 goto err_free;
542
543 return 0;
544 err_free:
545 wil_vring_free(wil, vring, 0);
546
547 return rc;
548 }
549
550 void wil_rx_fini(struct wil6210_priv *wil)
551 {
552 struct vring *vring = &wil->vring_rx;
553
554 if (vring->va)
555 wil_vring_free(wil, vring, 0);
556 }
557
558 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
559 int cid, int tid)
560 {
561 int rc;
562 struct wmi_vring_cfg_cmd cmd = {
563 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
564 .vring_cfg = {
565 .tx_sw_ring = {
566 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
567 .ring_size = cpu_to_le16(size),
568 },
569 .ringid = id,
570 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
571 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
572 .mac_ctrl = 0,
573 .to_resolution = 0,
574 .agg_max_wsize = 16,
575 .schd_params = {
576 .priority = cpu_to_le16(0),
577 .timeslot_us = cpu_to_le16(0xfff),
578 },
579 },
580 };
581 struct {
582 struct wil6210_mbox_hdr_wmi wmi;
583 struct wmi_vring_cfg_done_event cmd;
584 } __packed reply;
585 struct vring *vring = &wil->vring_tx[id];
586
587 if (vring->va) {
588 wil_err(wil, "Tx ring [%d] already allocated\n", id);
589 rc = -EINVAL;
590 goto out;
591 }
592
593 vring->size = size;
594 rc = wil_vring_alloc(wil, vring);
595 if (rc)
596 goto out;
597
598 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
599
600 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
601 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
602 if (rc)
603 goto out_free;
604
605 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
606 wil_err(wil, "Tx config failed, status 0x%02x\n",
607 reply.cmd.status);
608 rc = -EINVAL;
609 goto out_free;
610 }
611 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
612
613 return 0;
614 out_free:
615 wil_vring_free(wil, vring, 1);
616 out:
617
618 return rc;
619 }
620
621 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
622 {
623 struct vring *vring = &wil->vring_tx[id];
624
625 if (!vring->va)
626 return;
627
628 wil_vring_free(wil, vring, 1);
629 }
630
631 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
632 struct sk_buff *skb)
633 {
634 struct vring *v = &wil->vring_tx[0];
635
636 if (v->va)
637 return v;
638
639 return NULL;
640 }
641
642 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
643 int vring_index)
644 {
645 wil_desc_addr_set(&d->dma.addr, pa);
646 d->dma.ip_length = 0;
647 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
648 d->dma.b11 = 0/*14 | BIT(7)*/;
649 d->dma.error = 0;
650 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
651 d->dma.length = cpu_to_le16((u16)len);
652 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
653 d->mac.d[0] = 0;
654 d->mac.d[1] = 0;
655 d->mac.d[2] = 0;
656 d->mac.ucode_cmd = 0;
657 /* use dst index 0 */
658 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
659 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
660 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
661 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
662 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
663
664 return 0;
665 }
666
667 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
668 struct vring_tx_desc *d,
669 struct sk_buff *skb)
670 {
671 int protocol;
672
673 if (skb->ip_summed != CHECKSUM_PARTIAL)
674 return 0;
675
676 switch (skb->protocol) {
677 case cpu_to_be16(ETH_P_IP):
678 protocol = ip_hdr(skb)->protocol;
679 break;
680 case cpu_to_be16(ETH_P_IPV6):
681 protocol = ipv6_hdr(skb)->nexthdr;
682 break;
683 default:
684 return -EINVAL;
685 }
686
687 switch (protocol) {
688 case IPPROTO_TCP:
689 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
690 /* L4 header len: TCP header length */
691 d->dma.d0 |=
692 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
693 break;
694 case IPPROTO_UDP:
695 /* L4 header len: UDP header length */
696 d->dma.d0 |=
697 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
698 break;
699 default:
700 return -EINVAL;
701 }
702
703 d->dma.ip_length = skb_network_header_len(skb);
704 d->dma.b11 = ETH_HLEN; /* MAC header length */
705 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
706 /* Enable TCP/UDP checksum */
707 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
708 /* Calculate pseudo-header */
709 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
710
711 return 0;
712 }
713
714 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
715 struct sk_buff *skb)
716 {
717 struct device *dev = wil_to_dev(wil);
718 struct vring_tx_desc dd, *d = &dd;
719 volatile struct vring_tx_desc *_d;
720 u32 swhead = vring->swhead;
721 int avail = wil_vring_avail_tx(vring);
722 int nr_frags = skb_shinfo(skb)->nr_frags;
723 uint f = 0;
724 int vring_index = vring - wil->vring_tx;
725 uint i = swhead;
726 dma_addr_t pa;
727
728 wil_dbg_txrx(wil, "%s()\n", __func__);
729
730 if (avail < vring->size/8)
731 netif_tx_stop_all_queues(wil_to_ndev(wil));
732 if (avail < 1 + nr_frags) {
733 wil_err(wil, "Tx ring full. No space for %d fragments\n",
734 1 + nr_frags);
735 return -ENOMEM;
736 }
737 _d = &(vring->va[i].tx);
738
739 /* FIXME FW can accept only unicast frames for the peer */
740 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
741
742 pa = dma_map_single(dev, skb->data,
743 skb_headlen(skb), DMA_TO_DEVICE);
744
745 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
746 skb->data, (unsigned long long)pa);
747 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
748 skb->data, skb_headlen(skb), false);
749
750 if (unlikely(dma_mapping_error(dev, pa)))
751 return -EINVAL;
752 /* 1-st segment */
753 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
754 /* Process TCP/UDP checksum offloading */
755 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
756 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
757 vring_index);
758 goto dma_error;
759 }
760
761 d->mac.d[2] |= ((nr_frags + 1) <<
762 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
763 if (nr_frags)
764 *_d = *d;
765
766 /* middle segments */
767 for (; f < nr_frags; f++) {
768 const struct skb_frag_struct *frag =
769 &skb_shinfo(skb)->frags[f];
770 int len = skb_frag_size(frag);
771 i = (swhead + f + 1) % vring->size;
772 _d = &(vring->va[i].tx);
773 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
774 DMA_TO_DEVICE);
775 if (unlikely(dma_mapping_error(dev, pa)))
776 goto dma_error;
777 wil_tx_desc_map(d, pa, len, vring_index);
778 vring->ctx[i].mapped_as_page = 1;
779 *_d = *d;
780 }
781 /* for the last seg only */
782 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
783 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
784 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
785 *_d = *d;
786
787 /* hold reference to skb
788 * to prevent skb release before accounting
789 * in case of immediate "tx done"
790 */
791 vring->ctx[i].skb = skb_get(skb);
792
793 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
794 (const void *)d, sizeof(*d), false);
795
796 /* advance swhead */
797 wil_vring_advance_head(vring, nr_frags + 1);
798 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
799 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
800 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
801
802 return 0;
803 dma_error:
804 /* unmap what we have mapped */
805 nr_frags = f + 1; /* frags mapped + one for skb head */
806 for (f = 0; f < nr_frags; f++) {
807 u16 dmalen;
808 struct wil_ctx *ctx;
809
810 i = (swhead + f) % vring->size;
811 ctx = &vring->ctx[i];
812 _d = &(vring->va[i].tx);
813 *d = *_d;
814 _d->dma.status = TX_DMA_STATUS_DU;
815 pa = wil_desc_addr(&d->dma.addr);
816 dmalen = le16_to_cpu(d->dma.length);
817 if (ctx->mapped_as_page)
818 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
819 else
820 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
821
822 if (ctx->skb)
823 dev_kfree_skb_any(ctx->skb);
824
825 memset(ctx, 0, sizeof(*ctx));
826 }
827
828 return -EINVAL;
829 }
830
831
832 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
833 {
834 struct wil6210_priv *wil = ndev_to_wil(ndev);
835 struct vring *vring;
836 int rc;
837
838 wil_dbg_txrx(wil, "%s()\n", __func__);
839 if (!test_bit(wil_status_fwready, &wil->status)) {
840 wil_err(wil, "FW not ready\n");
841 goto drop;
842 }
843 if (!test_bit(wil_status_fwconnected, &wil->status)) {
844 wil_err(wil, "FW not connected\n");
845 goto drop;
846 }
847 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
848 wil_err(wil, "Xmit in monitor mode not supported\n");
849 goto drop;
850 }
851
852 /* find vring */
853 vring = wil_find_tx_vring(wil, skb);
854 if (!vring) {
855 wil_err(wil, "No Tx VRING available\n");
856 goto drop;
857 }
858 /* set up vring entry */
859 rc = wil_tx_vring(wil, vring, skb);
860
861 switch (rc) {
862 case 0:
863 /* statistics will be updated on the tx_complete */
864 dev_kfree_skb_any(skb);
865 return NETDEV_TX_OK;
866 case -ENOMEM:
867 return NETDEV_TX_BUSY;
868 default:
869 break; /* goto drop; */
870 }
871 drop:
872 ndev->stats.tx_dropped++;
873 dev_kfree_skb_any(skb);
874
875 return NET_XMIT_DROP;
876 }
877
878 /**
879 * Clean up transmitted skb's from the Tx VRING
880 *
881 * Return number of descriptors cleared
882 *
883 * Safe to call from IRQ
884 */
885 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
886 {
887 struct net_device *ndev = wil_to_ndev(wil);
888 struct device *dev = wil_to_dev(wil);
889 struct vring *vring = &wil->vring_tx[ringid];
890 int done = 0;
891
892 if (!vring->va) {
893 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
894 return 0;
895 }
896
897 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
898
899 while (!wil_vring_is_empty(vring)) {
900 volatile struct vring_tx_desc *_d =
901 &vring->va[vring->swtail].tx;
902 struct vring_tx_desc dd, *d = &dd;
903 dma_addr_t pa;
904 u16 dmalen;
905 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
906 struct sk_buff *skb = ctx->skb;
907
908 *d = *_d;
909
910 if (!(d->dma.status & TX_DMA_STATUS_DU))
911 break;
912
913 dmalen = le16_to_cpu(d->dma.length);
914 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
915 d->dma.error);
916 wil_dbg_txrx(wil,
917 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
918 vring->swtail, dmalen, d->dma.status,
919 d->dma.error);
920 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
921 (const void *)d, sizeof(*d), false);
922
923 pa = wil_desc_addr(&d->dma.addr);
924 if (ctx->mapped_as_page)
925 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
926 else
927 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
928
929 if (skb) {
930 if (d->dma.error == 0) {
931 ndev->stats.tx_packets++;
932 ndev->stats.tx_bytes += skb->len;
933 } else {
934 ndev->stats.tx_errors++;
935 }
936
937 dev_kfree_skb_any(skb);
938 }
939 memset(ctx, 0, sizeof(*ctx));
940 /*
941 * There is no need to touch HW descriptor:
942 * - ststus bit TX_DMA_STATUS_DU is set by design,
943 * so hardware will not try to process this desc.,
944 * - rest of descriptor will be initialized on Tx.
945 */
946 vring->swtail = wil_vring_next_tail(vring);
947 done++;
948 }
949 if (wil_vring_avail_tx(vring) > vring->size/4)
950 netif_tx_wake_all_queues(wil_to_ndev(wil));
951
952 return done;
953 }
Linux with added FPC-III support