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 = mtu_max + ETH_HLEN;
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 	struct sk_buff *skb = dev_alloc_skb(sz + headroom);
214 
215 	if (unlikely(!skb))
216 		return -ENOMEM;
217 
218 	skb_reserve(skb, headroom);
219 	skb_put(skb, sz);
220 
221 	pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
222 	if (unlikely(dma_mapping_error(dev, pa))) {
223 		kfree_skb(skb);
224 		return -ENOMEM;
225 	}
226 
227 	d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
228 	wil_desc_addr_set(&d->dma.addr, pa);
229 	/* ip_length don't care */
230 	/* b11 don't care */
231 	/* error don't care */
232 	d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
233 	d->dma.length = cpu_to_le16(sz);
234 	*_d = *d;
235 	vring->ctx[i].skb = skb;
236 
237 	return 0;
238 }
239 
240 /**
241  * Adds radiotap header
242  *
243  * Any error indicated as "Bad FCS"
244  *
245  * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
246  *  - Rx descriptor: 32 bytes
247  *  - Phy info
248  */
249 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
250 				       struct sk_buff *skb)
251 {
252 	struct wireless_dev *wdev = wil->wdev;
253 	struct wil6210_rtap {
254 		struct ieee80211_radiotap_header rthdr;
255 		/* fields should be in the order of bits in rthdr.it_present */
256 		/* flags */
257 		u8 flags;
258 		/* channel */
259 		__le16 chnl_freq __aligned(2);
260 		__le16 chnl_flags;
261 		/* MCS */
262 		u8 mcs_present;
263 		u8 mcs_flags;
264 		u8 mcs_index;
265 	} __packed;
266 	struct wil6210_rtap_vendor {
267 		struct wil6210_rtap rtap;
268 		/* vendor */
269 		u8 vendor_oui[3] __aligned(2);
270 		u8 vendor_ns;
271 		__le16 vendor_skip;
272 		u8 vendor_data[0];
273 	} __packed;
274 	struct vring_rx_desc *d = wil_skb_rxdesc(skb);
275 	struct wil6210_rtap_vendor *rtap_vendor;
276 	int rtap_len = sizeof(struct wil6210_rtap);
277 	int phy_length = 0; /* phy info header size, bytes */
278 	static char phy_data[128];
279 	struct ieee80211_channel *ch = wdev->preset_chandef.chan;
280 
281 	if (rtap_include_phy_info) {
282 		rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
283 		/* calculate additional length */
284 		if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
285 			/**
286 			 * PHY info starts from 8-byte boundary
287 			 * there are 8-byte lines, last line may be partially
288 			 * written (HW bug), thus FW configures for last line
289 			 * to be excessive. Driver skips this last line.
290 			 */
291 			int len = min_t(int, 8 + sizeof(phy_data),
292 					wil_rxdesc_phy_length(d));
293 
294 			if (len > 8) {
295 				void *p = skb_tail_pointer(skb);
296 				void *pa = PTR_ALIGN(p, 8);
297 
298 				if (skb_tailroom(skb) >= len + (pa - p)) {
299 					phy_length = len - 8;
300 					memcpy(phy_data, pa, phy_length);
301 				}
302 			}
303 		}
304 		rtap_len += phy_length;
305 	}
306 
307 	if (skb_headroom(skb) < rtap_len &&
308 	    pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
309 		wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
310 		return;
311 	}
312 
313 	rtap_vendor = (void *)skb_push(skb, rtap_len);
314 	memset(rtap_vendor, 0, rtap_len);
315 
316 	rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
317 	rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
318 	rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
319 			(1 << IEEE80211_RADIOTAP_FLAGS) |
320 			(1 << IEEE80211_RADIOTAP_CHANNEL) |
321 			(1 << IEEE80211_RADIOTAP_MCS));
322 	if (d->dma.status & RX_DMA_STATUS_ERROR)
323 		rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
324 
325 	rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
326 	rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
327 
328 	rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
329 	rtap_vendor->rtap.mcs_flags = 0;
330 	rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
331 
332 	if (rtap_include_phy_info) {
333 		rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
334 				IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
335 		/* OUI for Wilocity 04:ce:14 */
336 		rtap_vendor->vendor_oui[0] = 0x04;
337 		rtap_vendor->vendor_oui[1] = 0xce;
338 		rtap_vendor->vendor_oui[2] = 0x14;
339 		rtap_vendor->vendor_ns = 1;
340 		/* Rx descriptor + PHY data  */
341 		rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
342 						       phy_length);
343 		memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
344 		memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
345 		       phy_length);
346 	}
347 }
348 
349 /*
350  * Fast swap in place between 2 registers
351  */
352 static void wil_swap_u16(u16 *a, u16 *b)
353 {
354 	*a ^= *b;
355 	*b ^= *a;
356 	*a ^= *b;
357 }
358 
359 static void wil_swap_ethaddr(void *data)
360 {
361 	struct ethhdr *eth = data;
362 	u16 *s = (u16 *)eth->h_source;
363 	u16 *d = (u16 *)eth->h_dest;
364 
365 	wil_swap_u16(s++, d++);
366 	wil_swap_u16(s++, d++);
367 	wil_swap_u16(s, d);
368 }
369 
370 /**
371  * reap 1 frame from @swhead
372  *
373  * Rx descriptor copied to skb->cb
374  *
375  * Safe to call from IRQ
376  */
377 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
378 					 struct vring *vring)
379 {
380 	struct device *dev = wil_to_dev(wil);
381 	struct net_device *ndev = wil_to_ndev(wil);
382 	volatile struct vring_rx_desc *_d;
383 	struct vring_rx_desc *d;
384 	struct sk_buff *skb;
385 	dma_addr_t pa;
386 	unsigned int sz = mtu_max + ETH_HLEN;
387 	u16 dmalen;
388 	u8 ftype;
389 	u8 ds_bits;
390 	int cid;
391 	struct wil_net_stats *stats;
392 
393 	BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
394 
395 	if (wil_vring_is_empty(vring))
396 		return NULL;
397 
398 	_d = &vring->va[vring->swhead].rx;
399 	if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
400 		/* it is not error, we just reached end of Rx done area */
401 		return NULL;
402 	}
403 
404 	skb = vring->ctx[vring->swhead].skb;
405 	d = wil_skb_rxdesc(skb);
406 	*d = *_d;
407 	pa = wil_desc_addr(&d->dma.addr);
408 	vring->ctx[vring->swhead].skb = NULL;
409 	wil_vring_advance_head(vring, 1);
410 
411 	dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
412 	dmalen = le16_to_cpu(d->dma.length);
413 
414 	trace_wil6210_rx(vring->swhead, d);
415 	wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
416 	wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
417 			  (const void *)d, sizeof(*d), false);
418 
419 	if (dmalen > sz) {
420 		wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
421 		kfree_skb(skb);
422 		return NULL;
423 	}
424 	skb_trim(skb, dmalen);
425 
426 	prefetch(skb->data);
427 
428 	wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
429 			  skb->data, skb_headlen(skb), false);
430 
431 	cid = wil_rxdesc_cid(d);
432 	stats = &wil->sta[cid].stats;
433 	stats->last_mcs_rx = wil_rxdesc_mcs(d);
434 
435 	/* use radiotap header only if required */
436 	if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
437 		wil_rx_add_radiotap_header(wil, skb);
438 
439 	/* no extra checks if in sniffer mode */
440 	if (ndev->type != ARPHRD_ETHER)
441 		return skb;
442 	/*
443 	 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
444 	 * Driver should recognize it by frame type, that is found
445 	 * in Rx descriptor. If type is not data, it is 802.11 frame as is
446 	 */
447 	ftype = wil_rxdesc_ftype(d) << 2;
448 	if (ftype != IEEE80211_FTYPE_DATA) {
449 		wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
450 		/* TODO: process it */
451 		kfree_skb(skb);
452 		return NULL;
453 	}
454 
455 	if (skb->len < ETH_HLEN) {
456 		wil_err(wil, "Short frame, len = %d\n", skb->len);
457 		/* TODO: process it (i.e. BAR) */
458 		kfree_skb(skb);
459 		return NULL;
460 	}
461 
462 	/* L4 IDENT is on when HW calculated checksum, check status
463 	 * and in case of error drop the packet
464 	 * higher stack layers will handle retransmission (if required)
465 	 */
466 	if (d->dma.status & RX_DMA_STATUS_L4I) {
467 		/* L4 protocol identified, csum calculated */
468 		if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
469 			skb->ip_summed = CHECKSUM_UNNECESSARY;
470 		/* If HW reports bad checksum, let IP stack re-check it
471 		 * For example, HW don't understand Microsoft IP stack that
472 		 * mis-calculates TCP checksum - if it should be 0x0,
473 		 * it writes 0xffff in violation of RFC 1624
474 		 */
475 	}
476 
477 	ds_bits = wil_rxdesc_ds_bits(d);
478 	if (ds_bits == 1) {
479 		/*
480 		 * HW bug - in ToDS mode, i.e. Rx on AP side,
481 		 * addresses get swapped
482 		 */
483 		wil_swap_ethaddr(skb->data);
484 	}
485 
486 	return skb;
487 }
488 
489 /**
490  * allocate and fill up to @count buffers in rx ring
491  * buffers posted at @swtail
492  */
493 static int wil_rx_refill(struct wil6210_priv *wil, int count)
494 {
495 	struct net_device *ndev = wil_to_ndev(wil);
496 	struct vring *v = &wil->vring_rx;
497 	u32 next_tail;
498 	int rc = 0;
499 	int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
500 			WIL6210_RTAP_SIZE : 0;
501 
502 	for (; next_tail = wil_vring_next_tail(v),
503 			(next_tail != v->swhead) && (count-- > 0);
504 			v->swtail = next_tail) {
505 		rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
506 		if (rc) {
507 			wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
508 				rc, v->swtail);
509 			break;
510 		}
511 	}
512 	iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
513 
514 	return rc;
515 }
516 
517 /*
518  * Pass Rx packet to the netif. Update statistics.
519  * Called in softirq context (NAPI poll).
520  */
521 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
522 {
523 	gro_result_t rc;
524 	struct wil6210_priv *wil = ndev_to_wil(ndev);
525 	unsigned int len = skb->len;
526 	struct vring_rx_desc *d = wil_skb_rxdesc(skb);
527 	int cid = wil_rxdesc_cid(d);
528 	struct wil_net_stats *stats = &wil->sta[cid].stats;
529 
530 	skb_orphan(skb);
531 
532 	rc = napi_gro_receive(&wil->napi_rx, skb);
533 
534 	if (unlikely(rc == GRO_DROP)) {
535 		ndev->stats.rx_dropped++;
536 		stats->rx_dropped++;
537 		wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
538 	} else {
539 		ndev->stats.rx_packets++;
540 		stats->rx_packets++;
541 		ndev->stats.rx_bytes += len;
542 		stats->rx_bytes += len;
543 	}
544 	{
545 		static const char * const gro_res_str[] = {
546 			[GRO_MERGED]		= "GRO_MERGED",
547 			[GRO_MERGED_FREE]	= "GRO_MERGED_FREE",
548 			[GRO_HELD]		= "GRO_HELD",
549 			[GRO_NORMAL]		= "GRO_NORMAL",
550 			[GRO_DROP]		= "GRO_DROP",
551 		};
552 		wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n",
553 			     len, gro_res_str[rc]);
554 	}
555 }
556 
557 /**
558  * Proceed all completed skb's from Rx VRING
559  *
560  * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
561  */
562 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
563 {
564 	struct net_device *ndev = wil_to_ndev(wil);
565 	struct vring *v = &wil->vring_rx;
566 	struct sk_buff *skb;
567 
568 	if (!v->va) {
569 		wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
570 		return;
571 	}
572 	wil_dbg_txrx(wil, "%s()\n", __func__);
573 	while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
574 		(*quota)--;
575 
576 		if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
577 			skb->dev = ndev;
578 			skb_reset_mac_header(skb);
579 			skb->ip_summed = CHECKSUM_UNNECESSARY;
580 			skb->pkt_type = PACKET_OTHERHOST;
581 			skb->protocol = htons(ETH_P_802_2);
582 			wil_netif_rx_any(skb, ndev);
583 		} else {
584 			skb->protocol = eth_type_trans(skb, ndev);
585 			wil_rx_reorder(wil, skb);
586 		}
587 	}
588 	wil_rx_refill(wil, v->size);
589 }
590 
591 int wil_rx_init(struct wil6210_priv *wil, u16 size)
592 {
593 	struct vring *vring = &wil->vring_rx;
594 	int rc;
595 
596 	wil_dbg_misc(wil, "%s()\n", __func__);
597 
598 	if (vring->va) {
599 		wil_err(wil, "Rx ring already allocated\n");
600 		return -EINVAL;
601 	}
602 
603 	vring->size = size;
604 	rc = wil_vring_alloc(wil, vring);
605 	if (rc)
606 		return rc;
607 
608 	rc = wmi_rx_chain_add(wil, vring);
609 	if (rc)
610 		goto err_free;
611 
612 	rc = wil_rx_refill(wil, vring->size);
613 	if (rc)
614 		goto err_free;
615 
616 	return 0;
617  err_free:
618 	wil_vring_free(wil, vring, 0);
619 
620 	return rc;
621 }
622 
623 void wil_rx_fini(struct wil6210_priv *wil)
624 {
625 	struct vring *vring = &wil->vring_rx;
626 
627 	wil_dbg_misc(wil, "%s()\n", __func__);
628 
629 	if (vring->va)
630 		wil_vring_free(wil, vring, 0);
631 }
632 
633 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
634 		      int cid, int tid)
635 {
636 	int rc;
637 	struct wmi_vring_cfg_cmd cmd = {
638 		.action = cpu_to_le32(WMI_VRING_CMD_ADD),
639 		.vring_cfg = {
640 			.tx_sw_ring = {
641 				.max_mpdu_size =
642 					cpu_to_le16(wil_mtu2macbuf(mtu_max)),
643 				.ring_size = cpu_to_le16(size),
644 			},
645 			.ringid = id,
646 			.cidxtid = mk_cidxtid(cid, tid),
647 			.encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
648 			.mac_ctrl = 0,
649 			.to_resolution = 0,
650 			.agg_max_wsize = 0,
651 			.schd_params = {
652 				.priority = cpu_to_le16(0),
653 				.timeslot_us = cpu_to_le16(0xfff),
654 			},
655 		},
656 	};
657 	struct {
658 		struct wil6210_mbox_hdr_wmi wmi;
659 		struct wmi_vring_cfg_done_event cmd;
660 	} __packed reply;
661 	struct vring *vring = &wil->vring_tx[id];
662 	struct vring_tx_data *txdata = &wil->vring_tx_data[id];
663 
664 	wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
665 		     cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
666 
667 	if (vring->va) {
668 		wil_err(wil, "Tx ring [%d] already allocated\n", id);
669 		rc = -EINVAL;
670 		goto out;
671 	}
672 
673 	memset(txdata, 0, sizeof(*txdata));
674 	spin_lock_init(&txdata->lock);
675 	vring->size = size;
676 	rc = wil_vring_alloc(wil, vring);
677 	if (rc)
678 		goto out;
679 
680 	wil->vring2cid_tid[id][0] = cid;
681 	wil->vring2cid_tid[id][1] = tid;
682 
683 	cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
684 
685 	rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
686 		      WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
687 	if (rc)
688 		goto out_free;
689 
690 	if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
691 		wil_err(wil, "Tx config failed, status 0x%02x\n",
692 			reply.cmd.status);
693 		rc = -EINVAL;
694 		goto out_free;
695 	}
696 	vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
697 
698 	txdata->enabled = 1;
699 	if (wil->sta[cid].data_port_open && (agg_wsize >= 0))
700 		wil_addba_tx_request(wil, id, agg_wsize);
701 
702 	return 0;
703  out_free:
704 	wil_vring_free(wil, vring, 1);
705  out:
706 
707 	return rc;
708 }
709 
710 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
711 {
712 	struct vring *vring = &wil->vring_tx[id];
713 	struct vring_tx_data *txdata = &wil->vring_tx_data[id];
714 
715 	WARN_ON(!mutex_is_locked(&wil->mutex));
716 
717 	if (!vring->va)
718 		return;
719 
720 	wil_dbg_misc(wil, "%s() id=%d\n", __func__, id);
721 
722 	spin_lock_bh(&txdata->lock);
723 	txdata->enabled = 0; /* no Tx can be in progress or start anew */
724 	spin_unlock_bh(&txdata->lock);
725 	/* make sure NAPI won't touch this vring */
726 	if (test_bit(wil_status_napi_en, wil->status))
727 		napi_synchronize(&wil->napi_tx);
728 
729 	wil_vring_free(wil, vring, 1);
730 	memset(txdata, 0, sizeof(*txdata));
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 static struct vring *wil_find_tx_vring_sta(struct wil6210_priv *wil,
779 					   struct sk_buff *skb)
780 {
781 	struct vring *v;
782 	int i;
783 	u8 cid;
784 
785 	/* In the STA mode, it is expected to have only 1 VRING
786 	 * for the AP we connected to.
787 	 * find 1-st vring and see whether it is eligible for data
788 	 */
789 	for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
790 		v = &wil->vring_tx[i];
791 		if (!v->va)
792 			continue;
793 
794 		cid = wil->vring2cid_tid[i][0];
795 		if (!wil->sta[cid].data_port_open &&
796 		    (skb->protocol != cpu_to_be16(ETH_P_PAE)))
797 			break;
798 
799 		wil_dbg_txrx(wil, "Tx -> ring %d\n", i);
800 
801 		return v;
802 	}
803 
804 	wil_dbg_txrx(wil, "Tx while no vrings active?\n");
805 
806 	return NULL;
807 }
808 
809 /*
810  * Find 1-st vring and return it; set dest address for this vring in skb
811  * duplicate skb and send it to other active vrings
812  */
813 static struct vring *wil_tx_bcast(struct wil6210_priv *wil,
814 				  struct sk_buff *skb)
815 {
816 	struct vring *v, *v2;
817 	struct sk_buff *skb2;
818 	int i;
819 	u8 cid;
820 
821 	/* find 1-st vring eligible for data */
822 	for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
823 		v = &wil->vring_tx[i];
824 		if (!v->va)
825 			continue;
826 
827 		cid = wil->vring2cid_tid[i][0];
828 		if (!wil->sta[cid].data_port_open)
829 			continue;
830 
831 		goto found;
832 	}
833 
834 	wil_dbg_txrx(wil, "Tx while no vrings active?\n");
835 
836 	return NULL;
837 
838 found:
839 	wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
840 	wil_set_da_for_vring(wil, skb, i);
841 
842 	/* find other active vrings and duplicate skb for each */
843 	for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
844 		v2 = &wil->vring_tx[i];
845 		if (!v2->va)
846 			continue;
847 		cid = wil->vring2cid_tid[i][0];
848 		if (!wil->sta[cid].data_port_open)
849 			continue;
850 
851 		skb2 = skb_copy(skb, GFP_ATOMIC);
852 		if (skb2) {
853 			wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
854 			wil_set_da_for_vring(wil, skb2, i);
855 			wil_tx_vring(wil, v2, skb2);
856 		} else {
857 			wil_err(wil, "skb_copy failed\n");
858 		}
859 	}
860 
861 	return v;
862 }
863 
864 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
865 			   int vring_index)
866 {
867 	wil_desc_addr_set(&d->dma.addr, pa);
868 	d->dma.ip_length = 0;
869 	/* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
870 	d->dma.b11 = 0/*14 | BIT(7)*/;
871 	d->dma.error = 0;
872 	d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
873 	d->dma.length = cpu_to_le16((u16)len);
874 	d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
875 	d->mac.d[0] = 0;
876 	d->mac.d[1] = 0;
877 	d->mac.d[2] = 0;
878 	d->mac.ucode_cmd = 0;
879 	/* translation type:  0 - bypass; 1 - 802.3; 2 - native wifi */
880 	d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
881 		      (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
882 
883 	return 0;
884 }
885 
886 static inline
887 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
888 {
889 	d->mac.d[2] |= ((nr_frags + 1) <<
890 		       MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
891 }
892 
893 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
894 					 struct vring_tx_desc *d,
895 					 struct sk_buff *skb)
896 {
897 	int protocol;
898 
899 	if (skb->ip_summed != CHECKSUM_PARTIAL)
900 		return 0;
901 
902 	d->dma.b11 = ETH_HLEN; /* MAC header length */
903 
904 	switch (skb->protocol) {
905 	case cpu_to_be16(ETH_P_IP):
906 		protocol = ip_hdr(skb)->protocol;
907 		d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
908 		break;
909 	case cpu_to_be16(ETH_P_IPV6):
910 		protocol = ipv6_hdr(skb)->nexthdr;
911 		break;
912 	default:
913 		return -EINVAL;
914 	}
915 
916 	switch (protocol) {
917 	case IPPROTO_TCP:
918 		d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
919 		/* L4 header len: TCP header length */
920 		d->dma.d0 |=
921 		(tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
922 		break;
923 	case IPPROTO_UDP:
924 		/* L4 header len: UDP header length */
925 		d->dma.d0 |=
926 		(sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
927 		break;
928 	default:
929 		return -EINVAL;
930 	}
931 
932 	d->dma.ip_length = skb_network_header_len(skb);
933 	/* Enable TCP/UDP checksum */
934 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
935 	/* Calculate pseudo-header */
936 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
937 
938 	return 0;
939 }
940 
941 static int __wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
942 			  struct sk_buff *skb)
943 {
944 	struct device *dev = wil_to_dev(wil);
945 	struct vring_tx_desc dd, *d = &dd;
946 	volatile struct vring_tx_desc *_d;
947 	u32 swhead = vring->swhead;
948 	int avail = wil_vring_avail_tx(vring);
949 	int nr_frags = skb_shinfo(skb)->nr_frags;
950 	uint f = 0;
951 	int vring_index = vring - wil->vring_tx;
952 	struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
953 	uint i = swhead;
954 	dma_addr_t pa;
955 
956 	wil_dbg_txrx(wil, "%s()\n", __func__);
957 
958 	if (unlikely(!txdata->enabled))
959 		return -EINVAL;
960 
961 	if (avail < 1 + nr_frags) {
962 		wil_err_ratelimited(wil,
963 				    "Tx ring[%2d] full. No space for %d fragments\n",
964 				    vring_index, 1 + nr_frags);
965 		return -ENOMEM;
966 	}
967 	_d = &vring->va[i].tx;
968 
969 	pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
970 
971 	wil_dbg_txrx(wil, "Tx[%2d] skb %d bytes 0x%p -> %pad\n", vring_index,
972 		     skb_headlen(skb), skb->data, &pa);
973 	wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
974 			  skb->data, skb_headlen(skb), false);
975 
976 	if (unlikely(dma_mapping_error(dev, pa)))
977 		return -EINVAL;
978 	vring->ctx[i].mapped_as = wil_mapped_as_single;
979 	/* 1-st segment */
980 	wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
981 	/* Process TCP/UDP checksum offloading */
982 	if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
983 		wil_err(wil, "Tx[%2d] Failed to set cksum, drop packet\n",
984 			vring_index);
985 		goto dma_error;
986 	}
987 
988 	vring->ctx[i].nr_frags = nr_frags;
989 	wil_tx_desc_set_nr_frags(d, nr_frags);
990 
991 	/* middle segments */
992 	for (; f < nr_frags; f++) {
993 		const struct skb_frag_struct *frag =
994 				&skb_shinfo(skb)->frags[f];
995 		int len = skb_frag_size(frag);
996 
997 		*_d = *d;
998 		wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i);
999 		wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
1000 				  (const void *)d, sizeof(*d), false);
1001 		i = (swhead + f + 1) % vring->size;
1002 		_d = &vring->va[i].tx;
1003 		pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
1004 				      DMA_TO_DEVICE);
1005 		if (unlikely(dma_mapping_error(dev, pa)))
1006 			goto dma_error;
1007 		vring->ctx[i].mapped_as = wil_mapped_as_page;
1008 		wil_tx_desc_map(d, pa, len, vring_index);
1009 		/* no need to check return code -
1010 		 * if it succeeded for 1-st descriptor,
1011 		 * it will succeed here too
1012 		 */
1013 		wil_tx_desc_offload_cksum_set(wil, d, skb);
1014 	}
1015 	/* for the last seg only */
1016 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
1017 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
1018 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
1019 	*_d = *d;
1020 	wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i);
1021 	wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
1022 			  (const void *)d, sizeof(*d), false);
1023 
1024 	/* hold reference to skb
1025 	 * to prevent skb release before accounting
1026 	 * in case of immediate "tx done"
1027 	 */
1028 	vring->ctx[i].skb = skb_get(skb);
1029 
1030 	if (wil_vring_is_empty(vring)) /* performance monitoring */
1031 		txdata->idle += get_cycles() - txdata->last_idle;
1032 
1033 	/* advance swhead */
1034 	wil_vring_advance_head(vring, nr_frags + 1);
1035 	wil_dbg_txrx(wil, "Tx[%2d] swhead %d -> %d\n", vring_index, swhead,
1036 		     vring->swhead);
1037 	trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
1038 	iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
1039 
1040 	return 0;
1041  dma_error:
1042 	/* unmap what we have mapped */
1043 	nr_frags = f + 1; /* frags mapped + one for skb head */
1044 	for (f = 0; f < nr_frags; f++) {
1045 		struct wil_ctx *ctx;
1046 
1047 		i = (swhead + f) % vring->size;
1048 		ctx = &vring->ctx[i];
1049 		_d = &vring->va[i].tx;
1050 		*d = *_d;
1051 		_d->dma.status = TX_DMA_STATUS_DU;
1052 		wil_txdesc_unmap(dev, d, ctx);
1053 
1054 		if (ctx->skb)
1055 			dev_kfree_skb_any(ctx->skb);
1056 
1057 		memset(ctx, 0, sizeof(*ctx));
1058 	}
1059 
1060 	return -EINVAL;
1061 }
1062 
1063 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
1064 			struct sk_buff *skb)
1065 {
1066 	int vring_index = vring - wil->vring_tx;
1067 	struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
1068 	int rc;
1069 
1070 	spin_lock(&txdata->lock);
1071 	rc = __wil_tx_vring(wil, vring, skb);
1072 	spin_unlock(&txdata->lock);
1073 	return rc;
1074 }
1075 
1076 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1077 {
1078 	struct wil6210_priv *wil = ndev_to_wil(ndev);
1079 	struct ethhdr *eth = (void *)skb->data;
1080 	struct vring *vring;
1081 	static bool pr_once_fw;
1082 	int rc;
1083 
1084 	wil_dbg_txrx(wil, "%s()\n", __func__);
1085 	if (!test_bit(wil_status_fwready, wil->status)) {
1086 		if (!pr_once_fw) {
1087 			wil_err(wil, "FW not ready\n");
1088 			pr_once_fw = true;
1089 		}
1090 		goto drop;
1091 	}
1092 	if (!test_bit(wil_status_fwconnected, wil->status)) {
1093 		wil_err(wil, "FW not connected\n");
1094 		goto drop;
1095 	}
1096 	if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
1097 		wil_err(wil, "Xmit in monitor mode not supported\n");
1098 		goto drop;
1099 	}
1100 	pr_once_fw = false;
1101 
1102 	/* find vring */
1103 	if (wil->wdev->iftype == NL80211_IFTYPE_STATION) {
1104 		/* in STA mode (ESS), all to same VRING */
1105 		vring = wil_find_tx_vring_sta(wil, skb);
1106 	} else { /* direct communication, find matching VRING */
1107 		if (is_unicast_ether_addr(eth->h_dest))
1108 			vring = wil_find_tx_vring(wil, skb);
1109 		else
1110 			vring = wil_tx_bcast(wil, skb);
1111 	}
1112 	if (!vring) {
1113 		wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest);
1114 		goto drop;
1115 	}
1116 	/* set up vring entry */
1117 	rc = wil_tx_vring(wil, vring, skb);
1118 
1119 	/* do we still have enough room in the vring? */
1120 	if (wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring)) {
1121 		netif_tx_stop_all_queues(wil_to_ndev(wil));
1122 		wil_dbg_txrx(wil, "netif_tx_stop : ring full\n");
1123 	}
1124 
1125 	switch (rc) {
1126 	case 0:
1127 		/* statistics will be updated on the tx_complete */
1128 		dev_kfree_skb_any(skb);
1129 		return NETDEV_TX_OK;
1130 	case -ENOMEM:
1131 		return NETDEV_TX_BUSY;
1132 	default:
1133 		break; /* goto drop; */
1134 	}
1135  drop:
1136 	ndev->stats.tx_dropped++;
1137 	dev_kfree_skb_any(skb);
1138 
1139 	return NET_XMIT_DROP;
1140 }
1141 
1142 static inline bool wil_need_txstat(struct sk_buff *skb)
1143 {
1144 	struct ethhdr *eth = (void *)skb->data;
1145 
1146 	return is_unicast_ether_addr(eth->h_dest) && skb->sk &&
1147 	       (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS);
1148 }
1149 
1150 static inline void wil_consume_skb(struct sk_buff *skb, bool acked)
1151 {
1152 	if (unlikely(wil_need_txstat(skb)))
1153 		skb_complete_wifi_ack(skb, acked);
1154 	else
1155 		acked ? dev_consume_skb_any(skb) : dev_kfree_skb_any(skb);
1156 }
1157 
1158 /**
1159  * Clean up transmitted skb's from the Tx VRING
1160  *
1161  * Return number of descriptors cleared
1162  *
1163  * Safe to call from IRQ
1164  */
1165 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1166 {
1167 	struct net_device *ndev = wil_to_ndev(wil);
1168 	struct device *dev = wil_to_dev(wil);
1169 	struct vring *vring = &wil->vring_tx[ringid];
1170 	struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
1171 	int done = 0;
1172 	int cid = wil->vring2cid_tid[ringid][0];
1173 	struct wil_net_stats *stats = &wil->sta[cid].stats;
1174 	volatile struct vring_tx_desc *_d;
1175 
1176 	if (!vring->va) {
1177 		wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1178 		return 0;
1179 	}
1180 
1181 	if (!txdata->enabled) {
1182 		wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
1183 		return 0;
1184 	}
1185 
1186 	wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1187 
1188 	while (!wil_vring_is_empty(vring)) {
1189 		int new_swtail;
1190 		struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1191 		/**
1192 		 * For the fragmented skb, HW will set DU bit only for the
1193 		 * last fragment. look for it
1194 		 */
1195 		int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1196 		/* TODO: check we are not past head */
1197 
1198 		_d = &vring->va[lf].tx;
1199 		if (!(_d->dma.status & TX_DMA_STATUS_DU))
1200 			break;
1201 
1202 		new_swtail = (lf + 1) % vring->size;
1203 		while (vring->swtail != new_swtail) {
1204 			struct vring_tx_desc dd, *d = &dd;
1205 			u16 dmalen;
1206 			struct sk_buff *skb;
1207 
1208 			ctx = &vring->ctx[vring->swtail];
1209 			skb = ctx->skb;
1210 			_d = &vring->va[vring->swtail].tx;
1211 
1212 			*d = *_d;
1213 
1214 			dmalen = le16_to_cpu(d->dma.length);
1215 			trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1216 					      d->dma.error);
1217 			wil_dbg_txrx(wil,
1218 				     "TxC[%2d][%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1219 				     ringid, vring->swtail, dmalen,
1220 				     d->dma.status, d->dma.error);
1221 			wil_hex_dump_txrx("TxCD ", DUMP_PREFIX_NONE, 32, 4,
1222 					  (const void *)d, sizeof(*d), false);
1223 
1224 			wil_txdesc_unmap(dev, d, ctx);
1225 
1226 			if (skb) {
1227 				if (d->dma.error == 0) {
1228 					ndev->stats.tx_packets++;
1229 					stats->tx_packets++;
1230 					ndev->stats.tx_bytes += skb->len;
1231 					stats->tx_bytes += skb->len;
1232 				} else {
1233 					ndev->stats.tx_errors++;
1234 					stats->tx_errors++;
1235 				}
1236 				wil_consume_skb(skb, d->dma.error == 0);
1237 			}
1238 			memset(ctx, 0, sizeof(*ctx));
1239 			/* There is no need to touch HW descriptor:
1240 			 * - ststus bit TX_DMA_STATUS_DU is set by design,
1241 			 *   so hardware will not try to process this desc.,
1242 			 * - rest of descriptor will be initialized on Tx.
1243 			 */
1244 			vring->swtail = wil_vring_next_tail(vring);
1245 			done++;
1246 		}
1247 	}
1248 
1249 	if (wil_vring_is_empty(vring)) { /* performance monitoring */
1250 		wil_dbg_txrx(wil, "Ring[%2d] empty\n", ringid);
1251 		txdata->last_idle = get_cycles();
1252 	}
1253 
1254 	if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) {
1255 		wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n");
1256 		netif_tx_wake_all_queues(wil_to_ndev(wil));
1257 	}
1258 
1259 	return done;
1260 }
1261