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fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / net / wireless / ath / wil6210 / txrx.c
blob0b0975d88b431644f172514442eea9dd272a1d38
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 #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 * Available space in Tx Vring
57 */
58 static inline int wil_vring_avail_tx(struct vring *vring)
59 {
60 u32 swhead = vring->swhead;
61 u32 swtail = vring->swtail;
62 int used = (vring->size + swhead - swtail) % vring->size;
63
64 return vring->size - used - 1;
65 }
66
67 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
68 {
69 struct device *dev = wil_to_dev(wil);
70 size_t sz = vring->size * sizeof(vring->va[0]);
71 uint i;
72
73 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
74
75 vring->swhead = 0;
76 vring->swtail = 0;
77 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
78 if (!vring->ctx) {
79 vring->va = NULL;
80 return -ENOMEM;
81 }
82 /*
83 * vring->va should be aligned on its size rounded up to power of 2
84 * This is granted by the dma_alloc_coherent
85 */
86 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
87 if (!vring->va) {
88 kfree(vring->ctx);
89 vring->ctx = NULL;
90 return -ENOMEM;
91 }
92 /* initially, all descriptors are SW owned
93 * For Tx and Rx, ownership bit is at the same location, thus
94 * we can use any
95 */
96 for (i = 0; i < vring->size; i++) {
97 volatile struct vring_tx_desc *_d = &(vring->va[i].tx);
98 _d->dma.status = TX_DMA_STATUS_DU;
99 }
100
101 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
102 vring->va, (unsigned long long)vring->pa, vring->ctx);
103
104 return 0;
105 }
106
107 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
108 int tx)
109 {
110 struct device *dev = wil_to_dev(wil);
111 size_t sz = vring->size * sizeof(vring->va[0]);
112
113 while (!wil_vring_is_empty(vring)) {
114 dma_addr_t pa;
115 u16 dmalen;
116 struct wil_ctx *ctx;
117
118 if (tx) {
119 struct vring_tx_desc dd, *d = &dd;
120 volatile struct vring_tx_desc *_d =
121 &vring->va[vring->swtail].tx;
122
123 ctx = &vring->ctx[vring->swtail];
124 *d = *_d;
125 pa = wil_desc_addr(&d->dma.addr);
126 dmalen = le16_to_cpu(d->dma.length);
127 if (vring->ctx[vring->swtail].mapped_as_page) {
128 dma_unmap_page(dev, pa, dmalen,
129 DMA_TO_DEVICE);
130 } else {
131 dma_unmap_single(dev, pa, dmalen,
132 DMA_TO_DEVICE);
133 }
134 if (ctx->skb)
135 dev_kfree_skb_any(ctx->skb);
136 vring->swtail = wil_vring_next_tail(vring);
137 } else { /* rx */
138 struct vring_rx_desc dd, *d = &dd;
139 volatile struct vring_rx_desc *_d =
140 &vring->va[vring->swhead].rx;
141
142 ctx = &vring->ctx[vring->swhead];
143 *d = *_d;
144 pa = wil_desc_addr(&d->dma.addr);
145 dmalen = le16_to_cpu(d->dma.length);
146 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
147 kfree_skb(ctx->skb);
148 wil_vring_advance_head(vring, 1);
149 }
150 }
151 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
152 kfree(vring->ctx);
153 vring->pa = 0;
154 vring->va = NULL;
155 vring->ctx = NULL;
156 }
157
158 /**
159 * Allocate one skb for Rx VRING
160 *
161 * Safe to call from IRQ
162 */
163 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
164 u32 i, int headroom)
165 {
166 struct device *dev = wil_to_dev(wil);
167 unsigned int sz = RX_BUF_LEN;
168 struct vring_rx_desc dd, *d = &dd;
169 volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
170 dma_addr_t pa;
171
172 /* TODO align */
173 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
174 if (unlikely(!skb))
175 return -ENOMEM;
176
177 skb_reserve(skb, headroom);
178 skb_put(skb, sz);
179
180 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
181 if (unlikely(dma_mapping_error(dev, pa))) {
182 kfree_skb(skb);
183 return -ENOMEM;
184 }
185
186 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
187 wil_desc_addr_set(&d->dma.addr, pa);
188 /* ip_length don't care */
189 /* b11 don't care */
190 /* error don't care */
191 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
192 d->dma.length = cpu_to_le16(sz);
193 *_d = *d;
194 vring->ctx[i].skb = skb;
195
196 return 0;
197 }
198
199 /**
200 * Adds radiotap header
201 *
202 * Any error indicated as "Bad FCS"
203 *
204 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
205 * - Rx descriptor: 32 bytes
206 * - Phy info
207 */
208 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
209 struct sk_buff *skb)
210 {
211 struct wireless_dev *wdev = wil->wdev;
212 struct wil6210_rtap {
213 struct ieee80211_radiotap_header rthdr;
214 /* fields should be in the order of bits in rthdr.it_present */
215 /* flags */
216 u8 flags;
217 /* channel */
218 __le16 chnl_freq __aligned(2);
219 __le16 chnl_flags;
220 /* MCS */
221 u8 mcs_present;
222 u8 mcs_flags;
223 u8 mcs_index;
224 } __packed;
225 struct wil6210_rtap_vendor {
226 struct wil6210_rtap rtap;
227 /* vendor */
228 u8 vendor_oui[3] __aligned(2);
229 u8 vendor_ns;
230 __le16 vendor_skip;
231 u8 vendor_data[0];
232 } __packed;
233 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
234 struct wil6210_rtap_vendor *rtap_vendor;
235 int rtap_len = sizeof(struct wil6210_rtap);
236 int phy_length = 0; /* phy info header size, bytes */
237 static char phy_data[128];
238 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
239
240 if (rtap_include_phy_info) {
241 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
242 /* calculate additional length */
243 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
244 /**
245 * PHY info starts from 8-byte boundary
246 * there are 8-byte lines, last line may be partially
247 * written (HW bug), thus FW configures for last line
248 * to be excessive. Driver skips this last line.
249 */
250 int len = min_t(int, 8 + sizeof(phy_data),
251 wil_rxdesc_phy_length(d));
252 if (len > 8) {
253 void *p = skb_tail_pointer(skb);
254 void *pa = PTR_ALIGN(p, 8);
255 if (skb_tailroom(skb) >= len + (pa - p)) {
256 phy_length = len - 8;
257 memcpy(phy_data, pa, phy_length);
258 }
259 }
260 }
261 rtap_len += phy_length;
262 }
263
264 if (skb_headroom(skb) < rtap_len &&
265 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
266 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
267 return;
268 }
269
270 rtap_vendor = (void *)skb_push(skb, rtap_len);
271 memset(rtap_vendor, 0, rtap_len);
272
273 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
274 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
275 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
276 (1 << IEEE80211_RADIOTAP_FLAGS) |
277 (1 << IEEE80211_RADIOTAP_CHANNEL) |
278 (1 << IEEE80211_RADIOTAP_MCS));
279 if (d->dma.status & RX_DMA_STATUS_ERROR)
280 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
281
282 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
283 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
284
285 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
286 rtap_vendor->rtap.mcs_flags = 0;
287 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
288
289 if (rtap_include_phy_info) {
290 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
291 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
292 /* OUI for Wilocity 04:ce:14 */
293 rtap_vendor->vendor_oui[0] = 0x04;
294 rtap_vendor->vendor_oui[1] = 0xce;
295 rtap_vendor->vendor_oui[2] = 0x14;
296 rtap_vendor->vendor_ns = 1;
297 /* Rx descriptor + PHY data */
298 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
299 phy_length);
300 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
301 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
302 phy_length);
303 }
304 }
305
306 /*
307 * Fast swap in place between 2 registers
308 */
309 static void wil_swap_u16(u16 *a, u16 *b)
310 {
311 *a ^= *b;
312 *b ^= *a;
313 *a ^= *b;
314 }
315
316 static void wil_swap_ethaddr(void *data)
317 {
318 struct ethhdr *eth = data;
319 u16 *s = (u16 *)eth->h_source;
320 u16 *d = (u16 *)eth->h_dest;
321
322 wil_swap_u16(s++, d++);
323 wil_swap_u16(s++, d++);
324 wil_swap_u16(s, d);
325 }
326
327 /**
328 * reap 1 frame from @swhead
329 *
330 * Rx descriptor copied to skb->cb
331 *
332 * Safe to call from IRQ
333 */
334 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
335 struct vring *vring)
336 {
337 struct device *dev = wil_to_dev(wil);
338 struct net_device *ndev = wil_to_ndev(wil);
339 volatile struct vring_rx_desc *_d;
340 struct vring_rx_desc *d;
341 struct sk_buff *skb;
342 dma_addr_t pa;
343 unsigned int sz = RX_BUF_LEN;
344 u16 dmalen;
345 u8 ftype;
346 u8 ds_bits;
347
348 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
349
350 if (wil_vring_is_empty(vring))
351 return NULL;
352
353 _d = &(vring->va[vring->swhead].rx);
354 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
355 /* it is not error, we just reached end of Rx done area */
356 return NULL;
357 }
358
359 skb = vring->ctx[vring->swhead].skb;
360 d = wil_skb_rxdesc(skb);
361 *d = *_d;
362 pa = wil_desc_addr(&d->dma.addr);
363 vring->ctx[vring->swhead].skb = NULL;
364 wil_vring_advance_head(vring, 1);
365
366 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
367 dmalen = le16_to_cpu(d->dma.length);
368
369 trace_wil6210_rx(vring->swhead, d);
370 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
371 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
372 (const void *)d, sizeof(*d), false);
373
374 if (dmalen > sz) {
375 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
376 kfree_skb(skb);
377 return NULL;
378 }
379 skb_trim(skb, dmalen);
380
381 prefetch(skb->data);
382
383 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
384 skb->data, skb_headlen(skb), false);
385
386
387 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
388
389 /* use radiotap header only if required */
390 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
391 wil_rx_add_radiotap_header(wil, skb);
392
393 /* no extra checks if in sniffer mode */
394 if (ndev->type != ARPHRD_ETHER)
395 return skb;
396 /*
397 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
398 * Driver should recognize it by frame type, that is found
399 * in Rx descriptor. If type is not data, it is 802.11 frame as is
400 */
401 ftype = wil_rxdesc_ftype(d) << 2;
402 if (ftype != IEEE80211_FTYPE_DATA) {
403 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
404 /* TODO: process it */
405 kfree_skb(skb);
406 return NULL;
407 }
408
409 if (skb->len < ETH_HLEN) {
410 wil_err(wil, "Short frame, len = %d\n", skb->len);
411 /* TODO: process it (i.e. BAR) */
412 kfree_skb(skb);
413 return NULL;
414 }
415
416 /* L4 IDENT is on when HW calculated checksum, check status
417 * and in case of error drop the packet
418 * higher stack layers will handle retransmission (if required)
419 */
420 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
421 /* L4 protocol identified, csum calculated */
422 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
423 skb->ip_summed = CHECKSUM_UNNECESSARY;
424 /* If HW reports bad checksum, let IP stack re-check it
425 * For example, HW don't understand Microsoft IP stack that
426 * mis-calculates TCP checksum - if it should be 0x0,
427 * it writes 0xffff in violation of RFC 1624
428 */
429 }
430
431 ds_bits = wil_rxdesc_ds_bits(d);
432 if (ds_bits == 1) {
433 /*
434 * HW bug - in ToDS mode, i.e. Rx on AP side,
435 * addresses get swapped
436 */
437 wil_swap_ethaddr(skb->data);
438 }
439
440 return skb;
441 }
442
443 /**
444 * allocate and fill up to @count buffers in rx ring
445 * buffers posted at @swtail
446 */
447 static int wil_rx_refill(struct wil6210_priv *wil, int count)
448 {
449 struct net_device *ndev = wil_to_ndev(wil);
450 struct vring *v = &wil->vring_rx;
451 u32 next_tail;
452 int rc = 0;
453 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
454 WIL6210_RTAP_SIZE : 0;
455
456 for (; next_tail = wil_vring_next_tail(v),
457 (next_tail != v->swhead) && (count-- > 0);
458 v->swtail = next_tail) {
459 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
460 if (rc) {
461 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
462 rc, v->swtail);
463 break;
464 }
465 }
466 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
467
468 return rc;
469 }
470
471 /*
472 * Pass Rx packet to the netif. Update statistics.
473 * Called in softirq context (NAPI poll).
474 */
475 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
476 {
477 int rc;
478 unsigned int len = skb->len;
479
480 skb_orphan(skb);
481
482 rc = netif_receive_skb(skb);
483
484 if (likely(rc == NET_RX_SUCCESS)) {
485 ndev->stats.rx_packets++;
486 ndev->stats.rx_bytes += len;
487
488 } else {
489 ndev->stats.rx_dropped++;
490 }
491 }
492
493 /**
494 * Proceed all completed skb's from Rx VRING
495 *
496 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
497 */
498 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
499 {
500 struct net_device *ndev = wil_to_ndev(wil);
501 struct vring *v = &wil->vring_rx;
502 struct sk_buff *skb;
503
504 if (!v->va) {
505 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
506 return;
507 }
508 wil_dbg_txrx(wil, "%s()\n", __func__);
509 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
510 (*quota)--;
511
512 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
513 skb->dev = ndev;
514 skb_reset_mac_header(skb);
515 skb->ip_summed = CHECKSUM_UNNECESSARY;
516 skb->pkt_type = PACKET_OTHERHOST;
517 skb->protocol = htons(ETH_P_802_2);
518
519 } else {
520 skb->protocol = eth_type_trans(skb, ndev);
521 }
522
523 wil_netif_rx_any(skb, ndev);
524 }
525 wil_rx_refill(wil, v->size);
526 }
527
528 int wil_rx_init(struct wil6210_priv *wil)
529 {
530 struct vring *vring = &wil->vring_rx;
531 int rc;
532
533 vring->size = WIL6210_RX_RING_SIZE;
534 rc = wil_vring_alloc(wil, vring);
535 if (rc)
536 return rc;
537
538 rc = wmi_rx_chain_add(wil, vring);
539 if (rc)
540 goto err_free;
541
542 rc = wil_rx_refill(wil, vring->size);
543 if (rc)
544 goto err_free;
545
546 return 0;
547 err_free:
548 wil_vring_free(wil, vring, 0);
549
550 return rc;
551 }
552
553 void wil_rx_fini(struct wil6210_priv *wil)
554 {
555 struct vring *vring = &wil->vring_rx;
556
557 if (vring->va)
558 wil_vring_free(wil, vring, 0);
559 }
560
561 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
562 int cid, int tid)
563 {
564 int rc;
565 struct wmi_vring_cfg_cmd cmd = {
566 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
567 .vring_cfg = {
568 .tx_sw_ring = {
569 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
570 .ring_size = cpu_to_le16(size),
571 },
572 .ringid = id,
573 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
574 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
575 .mac_ctrl = 0,
576 .to_resolution = 0,
577 .agg_max_wsize = 16,
578 .schd_params = {
579 .priority = cpu_to_le16(0),
580 .timeslot_us = cpu_to_le16(0xfff),
581 },
582 },
583 };
584 struct {
585 struct wil6210_mbox_hdr_wmi wmi;
586 struct wmi_vring_cfg_done_event cmd;
587 } __packed reply;
588 struct vring *vring = &wil->vring_tx[id];
589
590 if (vring->va) {
591 wil_err(wil, "Tx ring [%d] already allocated\n", id);
592 rc = -EINVAL;
593 goto out;
594 }
595
596 vring->size = size;
597 rc = wil_vring_alloc(wil, vring);
598 if (rc)
599 goto out;
600
601 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
602
603 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
604 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
605 if (rc)
606 goto out_free;
607
608 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
609 wil_err(wil, "Tx config failed, status 0x%02x\n",
610 reply.cmd.status);
611 rc = -EINVAL;
612 goto out_free;
613 }
614 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
615
616 return 0;
617 out_free:
618 wil_vring_free(wil, vring, 1);
619 out:
620
621 return rc;
622 }
623
624 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
625 {
626 struct vring *vring = &wil->vring_tx[id];
627
628 if (!vring->va)
629 return;
630
631 wil_vring_free(wil, vring, 1);
632 }
633
634 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
635 struct sk_buff *skb)
636 {
637 struct vring *v = &wil->vring_tx[0];
638
639 if (v->va)
640 return v;
641
642 return NULL;
643 }
644
645 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
646 int vring_index)
647 {
648 wil_desc_addr_set(&d->dma.addr, pa);
649 d->dma.ip_length = 0;
650 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
651 d->dma.b11 = 0/*14 | BIT(7)*/;
652 d->dma.error = 0;
653 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
654 d->dma.length = cpu_to_le16((u16)len);
655 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
656 d->mac.d[0] = 0;
657 d->mac.d[1] = 0;
658 d->mac.d[2] = 0;
659 d->mac.ucode_cmd = 0;
660 /* use dst index 0 */
661 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
662 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
663 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
664 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
665 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
666
667 return 0;
668 }
669
670 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
671 struct vring_tx_desc *d,
672 struct sk_buff *skb)
673 {
674 int protocol;
675
676 if (skb->ip_summed != CHECKSUM_PARTIAL)
677 return 0;
678
679 d->dma.b11 = ETH_HLEN; /* MAC header length */
680
681 switch (skb->protocol) {
682 case cpu_to_be16(ETH_P_IP):
683 protocol = ip_hdr(skb)->protocol;
684 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
685 break;
686 case cpu_to_be16(ETH_P_IPV6):
687 protocol = ipv6_hdr(skb)->nexthdr;
688 break;
689 default:
690 return -EINVAL;
691 }
692
693 switch (protocol) {
694 case IPPROTO_TCP:
695 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
696 /* L4 header len: TCP header length */
697 d->dma.d0 |=
698 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
699 break;
700 case IPPROTO_UDP:
701 /* L4 header len: UDP header length */
702 d->dma.d0 |=
703 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
704 break;
705 default:
706 return -EINVAL;
707 }
708
709 d->dma.ip_length = skb_network_header_len(skb);
710 /* Enable TCP/UDP checksum */
711 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
712 /* Calculate pseudo-header */
713 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
714
715 return 0;
716 }
717
718 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
719 struct sk_buff *skb)
720 {
721 struct device *dev = wil_to_dev(wil);
722 struct vring_tx_desc dd, *d = &dd;
723 volatile struct vring_tx_desc *_d;
724 u32 swhead = vring->swhead;
725 int avail = wil_vring_avail_tx(vring);
726 int nr_frags = skb_shinfo(skb)->nr_frags;
727 uint f = 0;
728 int vring_index = vring - wil->vring_tx;
729 uint i = swhead;
730 dma_addr_t pa;
731
732 wil_dbg_txrx(wil, "%s()\n", __func__);
733
734 if (avail < vring->size/8)
735 netif_tx_stop_all_queues(wil_to_ndev(wil));
736 if (avail < 1 + nr_frags) {
737 wil_err(wil, "Tx ring full. No space for %d fragments\n",
738 1 + nr_frags);
739 return -ENOMEM;
740 }
741 _d = &(vring->va[i].tx);
742
743 /* FIXME FW can accept only unicast frames for the peer */
744 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
745
746 pa = dma_map_single(dev, skb->data,
747 skb_headlen(skb), DMA_TO_DEVICE);
748
749 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
750 skb->data, (unsigned long long)pa);
751 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
752 skb->data, skb_headlen(skb), false);
753
754 if (unlikely(dma_mapping_error(dev, pa)))
755 return -EINVAL;
756 /* 1-st segment */
757 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
758 /* Process TCP/UDP checksum offloading */
759 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
760 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
761 vring_index);
762 goto dma_error;
763 }
764
765 d->mac.d[2] |= ((nr_frags + 1) <<
766 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
767 if (nr_frags)
768 *_d = *d;
769
770 /* middle segments */
771 for (; f < nr_frags; f++) {
772 const struct skb_frag_struct *frag =
773 &skb_shinfo(skb)->frags[f];
774 int len = skb_frag_size(frag);
775 i = (swhead + f + 1) % vring->size;
776 _d = &(vring->va[i].tx);
777 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
778 DMA_TO_DEVICE);
779 if (unlikely(dma_mapping_error(dev, pa)))
780 goto dma_error;
781 wil_tx_desc_map(d, pa, len, vring_index);
782 vring->ctx[i].mapped_as_page = 1;
783 *_d = *d;
784 }
785 /* for the last seg only */
786 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
787 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
788 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
789 *_d = *d;
790
791 /* hold reference to skb
792 * to prevent skb release before accounting
793 * in case of immediate "tx done"
794 */
795 vring->ctx[i].skb = skb_get(skb);
796
797 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
798 (const void *)d, sizeof(*d), false);
799
800 /* advance swhead */
801 wil_vring_advance_head(vring, nr_frags + 1);
802 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
803 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
804 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
805
806 return 0;
807 dma_error:
808 /* unmap what we have mapped */
809 nr_frags = f + 1; /* frags mapped + one for skb head */
810 for (f = 0; f < nr_frags; f++) {
811 u16 dmalen;
812 struct wil_ctx *ctx;
813
814 i = (swhead + f) % vring->size;
815 ctx = &vring->ctx[i];
816 _d = &(vring->va[i].tx);
817 *d = *_d;
818 _d->dma.status = TX_DMA_STATUS_DU;
819 pa = wil_desc_addr(&d->dma.addr);
820 dmalen = le16_to_cpu(d->dma.length);
821 if (ctx->mapped_as_page)
822 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
823 else
824 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
825
826 if (ctx->skb)
827 dev_kfree_skb_any(ctx->skb);
828
829 memset(ctx, 0, sizeof(*ctx));
830 }
831
832 return -EINVAL;
833 }
834
835
836 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
837 {
838 struct wil6210_priv *wil = ndev_to_wil(ndev);
839 struct vring *vring;
840 int rc;
841
842 wil_dbg_txrx(wil, "%s()\n", __func__);
843 if (!test_bit(wil_status_fwready, &wil->status)) {
844 wil_err(wil, "FW not ready\n");
845 goto drop;
846 }
847 if (!test_bit(wil_status_fwconnected, &wil->status)) {
848 wil_err(wil, "FW not connected\n");
849 goto drop;
850 }
851 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
852 wil_err(wil, "Xmit in monitor mode not supported\n");
853 goto drop;
854 }
855
856 /* find vring */
857 vring = wil_find_tx_vring(wil, skb);
858 if (!vring) {
859 wil_err(wil, "No Tx VRING available\n");
860 goto drop;
861 }
862 /* set up vring entry */
863 rc = wil_tx_vring(wil, vring, skb);
864
865 switch (rc) {
866 case 0:
867 /* statistics will be updated on the tx_complete */
868 dev_kfree_skb_any(skb);
869 return NETDEV_TX_OK;
870 case -ENOMEM:
871 return NETDEV_TX_BUSY;
872 default:
873 break; /* goto drop; */
874 }
875 drop:
876 ndev->stats.tx_dropped++;
877 dev_kfree_skb_any(skb);
878
879 return NET_XMIT_DROP;
880 }
881
882 /**
883 * Clean up transmitted skb's from the Tx VRING
884 *
885 * Return number of descriptors cleared
886 *
887 * Safe to call from IRQ
888 */
889 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
890 {
891 struct net_device *ndev = wil_to_ndev(wil);
892 struct device *dev = wil_to_dev(wil);
893 struct vring *vring = &wil->vring_tx[ringid];
894 int done = 0;
895
896 if (!vring->va) {
897 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
898 return 0;
899 }
900
901 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
902
903 while (!wil_vring_is_empty(vring)) {
904 volatile struct vring_tx_desc *_d =
905 &vring->va[vring->swtail].tx;
906 struct vring_tx_desc dd, *d = &dd;
907 dma_addr_t pa;
908 u16 dmalen;
909 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
910 struct sk_buff *skb = ctx->skb;
911
912 *d = *_d;
913
914 if (!(d->dma.status & TX_DMA_STATUS_DU))
915 break;
916
917 dmalen = le16_to_cpu(d->dma.length);
918 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
919 d->dma.error);
920 wil_dbg_txrx(wil,
921 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
922 vring->swtail, dmalen, d->dma.status,
923 d->dma.error);
924 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
925 (const void *)d, sizeof(*d), false);
926
927 pa = wil_desc_addr(&d->dma.addr);
928 if (ctx->mapped_as_page)
929 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
930 else
931 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
932
933 if (skb) {
934 if (d->dma.error == 0) {
935 ndev->stats.tx_packets++;
936 ndev->stats.tx_bytes += skb->len;
937 } else {
938 ndev->stats.tx_errors++;
939 }
940
941 dev_kfree_skb_any(skb);
942 }
943 memset(ctx, 0, sizeof(*ctx));
944 /*
945 * There is no need to touch HW descriptor:
946 * - ststus bit TX_DMA_STATUS_DU is set by design,
947 * so hardware will not try to process this desc.,
948 * - rest of descriptor will be initialized on Tx.
949 */
950 vring->swtail = wil_vring_next_tail(vring);
951 done++;
952 }
953 if (wil_vring_avail_tx(vring) > vring->size/4)
954 netif_tx_wake_all_queues(wil_to_ndev(wil));
955
956 return done;
957 }
Linux with added FPC-III support