2 * Copyright (c) 2012 Qualcomm Atheros, Inc.
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.
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.
17 #include <linux/etherdevice.h>
18 #include <net/ieee80211_radiotap.h>
19 #include <linux/if_arp.h>
20 #include <linux/moduleparam.h>
22 #include <linux/ipv6.h>
24 #include <linux/prefetch.h>
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");
36 static inline int wil_vring_is_empty(struct vring *vring)
38 return vring->swhead == vring->swtail;
41 static inline u32 wil_vring_next_tail(struct vring *vring)
43 return (vring->swtail + 1) % vring->size;
46 static inline void wil_vring_advance_head(struct vring *vring, int n)
48 vring->swhead = (vring->swhead + n) % vring->size;
51 static inline int wil_vring_is_full(struct vring *vring)
53 return wil_vring_next_tail(vring) == vring->swhead;
56 * Available space in Tx Vring
58 static inline int wil_vring_avail_tx(struct vring *vring)
60 u32 swhead = vring->swhead;
61 u32 swtail = vring->swtail;
62 int used = (vring->size + swhead - swtail) % vring->size;
64 return vring->size - used - 1;
67 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
69 struct device *dev = wil_to_dev(wil);
70 size_t sz = vring->size * sizeof(vring->va[0]);
73 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
77 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
83 * vring->va should be aligned on its size rounded up to power of 2
84 * This is granted by the dma_alloc_coherent
86 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
92 /* initially, all descriptors are SW owned
93 * For Tx and Rx, ownership bit is at the same location, thus
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;
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);
107 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
110 struct device *dev = wil_to_dev(wil);
111 size_t sz = vring->size * sizeof(vring->va[0]);
113 while (!wil_vring_is_empty(vring)) {
119 struct vring_tx_desc dd, *d = ⅆ
120 volatile struct vring_tx_desc *_d =
121 &vring->va[vring->swtail].tx;
123 ctx = &vring->ctx[vring->swtail];
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,
131 dma_unmap_single(dev, pa, dmalen,
135 dev_kfree_skb_any(ctx->skb);
136 vring->swtail = wil_vring_next_tail(vring);
138 struct vring_rx_desc dd, *d = ⅆ
139 volatile struct vring_rx_desc *_d =
140 &vring->va[vring->swhead].rx;
142 ctx = &vring->ctx[vring->swhead];
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);
148 wil_vring_advance_head(vring, 1);
151 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
159 * Allocate one skb for Rx VRING
161 * Safe to call from IRQ
163 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
166 struct device *dev = wil_to_dev(wil);
167 unsigned int sz = RX_BUF_LEN;
168 struct vring_rx_desc dd, *d = ⅆ
169 volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
173 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
177 skb_reserve(skb, headroom);
180 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
181 if (unlikely(dma_mapping_error(dev, pa))) {
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 */
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);
194 vring->ctx[i].skb = skb;
200 * Adds radiotap header
202 * Any error indicated as "Bad FCS"
204 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
205 * - Rx descriptor: 32 bytes
208 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
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 */
218 __le16 chnl_freq __aligned(2);
225 struct wil6210_rtap_vendor {
226 struct wil6210_rtap rtap;
228 u8 vendor_oui[3] __aligned(2);
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;
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) {
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.
250 int len = min_t(int, 8 + sizeof(phy_data),
251 wil_rxdesc_phy_length(d));
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);
261 rtap_len += phy_length;
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);
270 rtap_vendor = (void *)skb_push(skb, rtap_len);
271 memset(rtap_vendor, 0, rtap_len);
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;
282 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
283 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
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);
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) +
300 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
301 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
307 * Fast swap in place between 2 registers
309 static void wil_swap_u16(u16 *a, u16 *b)
316 static void wil_swap_ethaddr(void *data)
318 struct ethhdr *eth = data;
319 u16 *s = (u16 *)eth->h_source;
320 u16 *d = (u16 *)eth->h_dest;
322 wil_swap_u16(s++, d++);
323 wil_swap_u16(s++, d++);
328 * reap 1 frame from @swhead
330 * Rx descriptor copied to skb->cb
332 * Safe to call from IRQ
334 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
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;
343 unsigned int sz = RX_BUF_LEN;
348 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
350 if (wil_vring_is_empty(vring))
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 */
359 skb = vring->ctx[vring->swhead].skb;
360 d = wil_skb_rxdesc(skb);
362 pa = wil_desc_addr(&d->dma.addr);
363 vring->ctx[vring->swhead].skb = NULL;
364 wil_vring_advance_head(vring, 1);
366 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
367 dmalen = le16_to_cpu(d->dma.length);
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);
375 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
379 skb_trim(skb, dmalen);
383 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
384 skb->data, skb_headlen(skb), false);
387 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
389 /* use radiotap header only if required */
390 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
391 wil_rx_add_radiotap_header(wil, skb);
393 /* no extra checks if in sniffer mode */
394 if (ndev->type != ARPHRD_ETHER)
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
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 */
409 if (skb->len < ETH_HLEN) {
410 wil_err(wil, "Short frame, len = %d\n", skb->len);
411 /* TODO: process it (i.e. BAR) */
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)
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
431 ds_bits = wil_rxdesc_ds_bits(d);
434 * HW bug - in ToDS mode, i.e. Rx on AP side,
435 * addresses get swapped
437 wil_swap_ethaddr(skb->data);
444 * allocate and fill up to @count buffers in rx ring
445 * buffers posted at @swtail
447 static int wil_rx_refill(struct wil6210_priv *wil, int count)
449 struct net_device *ndev = wil_to_ndev(wil);
450 struct vring *v = &wil->vring_rx;
453 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
454 WIL6210_RTAP_SIZE : 0;
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);
461 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
466 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
472 * Pass Rx packet to the netif. Update statistics.
473 * Called in softirq context (NAPI poll).
475 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
478 unsigned int len = skb->len;
482 rc = netif_receive_skb(skb);
484 if (likely(rc == NET_RX_SUCCESS)) {
485 ndev->stats.rx_packets++;
486 ndev->stats.rx_bytes += len;
489 ndev->stats.rx_dropped++;
494 * Proceed all completed skb's from Rx VRING
496 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
498 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
500 struct net_device *ndev = wil_to_ndev(wil);
501 struct vring *v = &wil->vring_rx;
505 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
508 wil_dbg_txrx(wil, "%s()\n", __func__);
509 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
512 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
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);
520 skb->protocol = eth_type_trans(skb, ndev);
523 wil_netif_rx_any(skb, ndev);
525 wil_rx_refill(wil, v->size);
528 int wil_rx_init(struct wil6210_priv *wil)
530 struct vring *vring = &wil->vring_rx;
533 vring->size = WIL6210_RX_RING_SIZE;
534 rc = wil_vring_alloc(wil, vring);
538 rc = wmi_rx_chain_add(wil, vring);
542 rc = wil_rx_refill(wil, vring->size);
548 wil_vring_free(wil, vring, 0);
553 void wil_rx_fini(struct wil6210_priv *wil)
555 struct vring *vring = &wil->vring_rx;
558 wil_vring_free(wil, vring, 0);
561 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
565 struct wmi_vring_cfg_cmd cmd = {
566 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
569 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
570 .ring_size = cpu_to_le16(size),
573 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
574 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
579 .priority = cpu_to_le16(0),
580 .timeslot_us = cpu_to_le16(0xfff),
585 struct wil6210_mbox_hdr_wmi wmi;
586 struct wmi_vring_cfg_done_event cmd;
588 struct vring *vring = &wil->vring_tx[id];
591 wil_err(wil, "Tx ring [%d] already allocated\n", id);
597 rc = wil_vring_alloc(wil, vring);
601 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
603 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
604 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
608 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
609 wil_err(wil, "Tx config failed, status 0x%02x\n",
614 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
618 wil_vring_free(wil, vring, 1);
624 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
626 struct vring *vring = &wil->vring_tx[id];
631 wil_vring_free(wil, vring, 1);
634 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
637 struct vring *v = &wil->vring_tx[0];
645 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
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)*/;
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);
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);
670 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
671 struct vring_tx_desc *d,
676 if (skb->ip_summed != CHECKSUM_PARTIAL)
679 d->dma.b11 = ETH_HLEN; /* MAC header length */
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);
686 case cpu_to_be16(ETH_P_IPV6):
687 protocol = ipv6_hdr(skb)->nexthdr;
695 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
696 /* L4 header len: TCP header length */
698 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
701 /* L4 header len: UDP header length */
703 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
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);
718 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
721 struct device *dev = wil_to_dev(wil);
722 struct vring_tx_desc dd, *d = ⅆ
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;
728 int vring_index = vring - wil->vring_tx;
732 wil_dbg_txrx(wil, "%s()\n", __func__);
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",
741 _d = &(vring->va[i].tx);
743 /* FIXME FW can accept only unicast frames for the peer */
744 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
746 pa = dma_map_single(dev, skb->data,
747 skb_headlen(skb), DMA_TO_DEVICE);
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);
754 if (unlikely(dma_mapping_error(dev, pa)))
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",
765 d->mac.d[2] |= ((nr_frags + 1) <<
766 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
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),
779 if (unlikely(dma_mapping_error(dev, pa)))
781 wil_tx_desc_map(d, pa, len, vring_index);
782 vring->ctx[i].mapped_as_page = 1;
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);
791 /* hold reference to skb
792 * to prevent skb release before accounting
793 * in case of immediate "tx done"
795 vring->ctx[i].skb = skb_get(skb);
797 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
798 (const void *)d, sizeof(*d), false);
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));
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++) {
814 i = (swhead + f) % vring->size;
815 ctx = &vring->ctx[i];
816 _d = &(vring->va[i].tx);
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);
824 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
827 dev_kfree_skb_any(ctx->skb);
829 memset(ctx, 0, sizeof(*ctx));
836 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
838 struct wil6210_priv *wil = ndev_to_wil(ndev);
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");
847 if (!test_bit(wil_status_fwconnected, &wil->status)) {
848 wil_err(wil, "FW not connected\n");
851 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
852 wil_err(wil, "Xmit in monitor mode not supported\n");
857 vring = wil_find_tx_vring(wil, skb);
859 wil_err(wil, "No Tx VRING available\n");
862 /* set up vring entry */
863 rc = wil_tx_vring(wil, vring, skb);
867 /* statistics will be updated on the tx_complete */
868 dev_kfree_skb_any(skb);
871 return NETDEV_TX_BUSY;
873 break; /* goto drop; */
876 ndev->stats.tx_dropped++;
877 dev_kfree_skb_any(skb);
879 return NET_XMIT_DROP;
883 * Clean up transmitted skb's from the Tx VRING
885 * Return number of descriptors cleared
887 * Safe to call from IRQ
889 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
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];
897 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
901 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
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 = ⅆ
909 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
910 struct sk_buff *skb = ctx->skb;
914 if (!(d->dma.status & TX_DMA_STATUS_DU))
917 dmalen = le16_to_cpu(d->dma.length);
918 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
921 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
922 vring->swtail, dmalen, d->dma.status,
924 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
925 (const void *)d, sizeof(*d), false);
927 pa = wil_desc_addr(&d->dma.addr);
928 if (ctx->mapped_as_page)
929 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
931 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
934 if (d->dma.error == 0) {
935 ndev->stats.tx_packets++;
936 ndev->stats.tx_bytes += skb->len;
938 ndev->stats.tx_errors++;
941 dev_kfree_skb_any(skb);
943 memset(ctx, 0, sizeof(*ctx));
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.
950 vring->swtail = wil_vring_next_tail(vring);
953 if (wil_vring_avail_tx(vring) > vring->size/4)
954 netif_tx_wake_all_queues(wil_to_ndev(wil));