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_txdesc_unmap(struct device *dev, struct vring_tx_desc *d,
110 dma_addr_t pa = wil_desc_addr(&d->dma.addr);
111 u16 dmalen = le16_to_cpu(d->dma.length);
112 switch (ctx->mapped_as) {
113 case wil_mapped_as_single:
114 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
116 case wil_mapped_as_page:
117 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
124 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
127 struct device *dev = wil_to_dev(wil);
128 size_t sz = vring->size * sizeof(vring->va[0]);
130 while (!wil_vring_is_empty(vring)) {
136 struct vring_tx_desc dd, *d = ⅆ
137 volatile struct vring_tx_desc *_d =
138 &vring->va[vring->swtail].tx;
140 ctx = &vring->ctx[vring->swtail];
142 wil_txdesc_unmap(dev, d, ctx);
144 dev_kfree_skb_any(ctx->skb);
145 vring->swtail = wil_vring_next_tail(vring);
147 struct vring_rx_desc dd, *d = ⅆ
148 volatile struct vring_rx_desc *_d =
149 &vring->va[vring->swhead].rx;
151 ctx = &vring->ctx[vring->swhead];
153 pa = wil_desc_addr(&d->dma.addr);
154 dmalen = le16_to_cpu(d->dma.length);
155 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
157 wil_vring_advance_head(vring, 1);
160 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
168 * Allocate one skb for Rx VRING
170 * Safe to call from IRQ
172 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
175 struct device *dev = wil_to_dev(wil);
176 unsigned int sz = RX_BUF_LEN;
177 struct vring_rx_desc dd, *d = ⅆ
178 volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
182 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
186 skb_reserve(skb, headroom);
189 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
190 if (unlikely(dma_mapping_error(dev, pa))) {
195 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
196 wil_desc_addr_set(&d->dma.addr, pa);
197 /* ip_length don't care */
199 /* error don't care */
200 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
201 d->dma.length = cpu_to_le16(sz);
203 vring->ctx[i].skb = skb;
209 * Adds radiotap header
211 * Any error indicated as "Bad FCS"
213 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
214 * - Rx descriptor: 32 bytes
217 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
220 struct wireless_dev *wdev = wil->wdev;
221 struct wil6210_rtap {
222 struct ieee80211_radiotap_header rthdr;
223 /* fields should be in the order of bits in rthdr.it_present */
227 __le16 chnl_freq __aligned(2);
234 struct wil6210_rtap_vendor {
235 struct wil6210_rtap rtap;
237 u8 vendor_oui[3] __aligned(2);
242 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
243 struct wil6210_rtap_vendor *rtap_vendor;
244 int rtap_len = sizeof(struct wil6210_rtap);
245 int phy_length = 0; /* phy info header size, bytes */
246 static char phy_data[128];
247 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
249 if (rtap_include_phy_info) {
250 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
251 /* calculate additional length */
252 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
254 * PHY info starts from 8-byte boundary
255 * there are 8-byte lines, last line may be partially
256 * written (HW bug), thus FW configures for last line
257 * to be excessive. Driver skips this last line.
259 int len = min_t(int, 8 + sizeof(phy_data),
260 wil_rxdesc_phy_length(d));
262 void *p = skb_tail_pointer(skb);
263 void *pa = PTR_ALIGN(p, 8);
264 if (skb_tailroom(skb) >= len + (pa - p)) {
265 phy_length = len - 8;
266 memcpy(phy_data, pa, phy_length);
270 rtap_len += phy_length;
273 if (skb_headroom(skb) < rtap_len &&
274 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
275 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
279 rtap_vendor = (void *)skb_push(skb, rtap_len);
280 memset(rtap_vendor, 0, rtap_len);
282 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
283 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
284 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
285 (1 << IEEE80211_RADIOTAP_FLAGS) |
286 (1 << IEEE80211_RADIOTAP_CHANNEL) |
287 (1 << IEEE80211_RADIOTAP_MCS));
288 if (d->dma.status & RX_DMA_STATUS_ERROR)
289 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
291 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
292 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
294 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
295 rtap_vendor->rtap.mcs_flags = 0;
296 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
298 if (rtap_include_phy_info) {
299 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
300 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
301 /* OUI for Wilocity 04:ce:14 */
302 rtap_vendor->vendor_oui[0] = 0x04;
303 rtap_vendor->vendor_oui[1] = 0xce;
304 rtap_vendor->vendor_oui[2] = 0x14;
305 rtap_vendor->vendor_ns = 1;
306 /* Rx descriptor + PHY data */
307 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
309 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
310 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
316 * Fast swap in place between 2 registers
318 static void wil_swap_u16(u16 *a, u16 *b)
325 static void wil_swap_ethaddr(void *data)
327 struct ethhdr *eth = data;
328 u16 *s = (u16 *)eth->h_source;
329 u16 *d = (u16 *)eth->h_dest;
331 wil_swap_u16(s++, d++);
332 wil_swap_u16(s++, d++);
337 * reap 1 frame from @swhead
339 * Rx descriptor copied to skb->cb
341 * Safe to call from IRQ
343 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
346 struct device *dev = wil_to_dev(wil);
347 struct net_device *ndev = wil_to_ndev(wil);
348 volatile struct vring_rx_desc *_d;
349 struct vring_rx_desc *d;
352 unsigned int sz = RX_BUF_LEN;
357 struct wil_net_stats *stats;
360 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
362 if (wil_vring_is_empty(vring))
365 _d = &(vring->va[vring->swhead].rx);
366 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
367 /* it is not error, we just reached end of Rx done area */
371 skb = vring->ctx[vring->swhead].skb;
372 d = wil_skb_rxdesc(skb);
374 pa = wil_desc_addr(&d->dma.addr);
375 vring->ctx[vring->swhead].skb = NULL;
376 wil_vring_advance_head(vring, 1);
378 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
379 dmalen = le16_to_cpu(d->dma.length);
381 trace_wil6210_rx(vring->swhead, d);
382 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
383 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
384 (const void *)d, sizeof(*d), false);
387 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
391 skb_trim(skb, dmalen);
395 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
396 skb->data, skb_headlen(skb), false);
398 cid = wil_rxdesc_cid(d);
399 stats = &wil->sta[cid].stats;
400 stats->last_mcs_rx = wil_rxdesc_mcs(d);
401 wil->stats.last_mcs_rx = stats->last_mcs_rx;
403 /* use radiotap header only if required */
404 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
405 wil_rx_add_radiotap_header(wil, skb);
407 /* no extra checks if in sniffer mode */
408 if (ndev->type != ARPHRD_ETHER)
411 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
412 * Driver should recognize it by frame type, that is found
413 * in Rx descriptor. If type is not data, it is 802.11 frame as is
415 ftype = wil_rxdesc_ftype(d) << 2;
416 if (ftype != IEEE80211_FTYPE_DATA) {
417 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
418 /* TODO: process it */
423 if (skb->len < ETH_HLEN) {
424 wil_err(wil, "Short frame, len = %d\n", skb->len);
425 /* TODO: process it (i.e. BAR) */
430 /* L4 IDENT is on when HW calculated checksum, check status
431 * and in case of error drop the packet
432 * higher stack layers will handle retransmission (if required)
434 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
435 /* L4 protocol identified, csum calculated */
436 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 /* If HW reports bad checksum, let IP stack re-check it
439 * For example, HW don't understand Microsoft IP stack that
440 * mis-calculates TCP checksum - if it should be 0x0,
441 * it writes 0xffff in violation of RFC 1624
445 ds_bits = wil_rxdesc_ds_bits(d);
448 * HW bug - in ToDS mode, i.e. Rx on AP side,
449 * addresses get swapped
451 wil_swap_ethaddr(skb->data);
458 * allocate and fill up to @count buffers in rx ring
459 * buffers posted at @swtail
461 static int wil_rx_refill(struct wil6210_priv *wil, int count)
463 struct net_device *ndev = wil_to_ndev(wil);
464 struct vring *v = &wil->vring_rx;
467 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
468 WIL6210_RTAP_SIZE : 0;
470 for (; next_tail = wil_vring_next_tail(v),
471 (next_tail != v->swhead) && (count-- > 0);
472 v->swtail = next_tail) {
473 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
475 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
480 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
486 * Pass Rx packet to the netif. Update statistics.
487 * Called in softirq context (NAPI poll).
489 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
492 struct wil6210_priv *wil = ndev_to_wil(ndev);
493 unsigned int len = skb->len;
494 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
495 int cid = wil_rxdesc_cid(d);
496 struct wil_net_stats *stats = &wil->sta[cid].stats;
500 rc = netif_receive_skb(skb);
502 if (likely(rc == NET_RX_SUCCESS)) {
503 ndev->stats.rx_packets++;
505 ndev->stats.rx_bytes += len;
506 stats->rx_bytes += len;
509 ndev->stats.rx_dropped++;
515 * Proceed all completed skb's from Rx VRING
517 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
519 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
521 struct net_device *ndev = wil_to_ndev(wil);
522 struct vring *v = &wil->vring_rx;
526 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
529 wil_dbg_txrx(wil, "%s()\n", __func__);
530 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
533 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
535 skb_reset_mac_header(skb);
536 skb->ip_summed = CHECKSUM_UNNECESSARY;
537 skb->pkt_type = PACKET_OTHERHOST;
538 skb->protocol = htons(ETH_P_802_2);
539 wil_netif_rx_any(skb, ndev);
541 struct ethhdr *eth = (void *)skb->data;
543 skb->protocol = eth_type_trans(skb, ndev);
545 if (is_unicast_ether_addr(eth->h_dest))
546 wil_rx_reorder(wil, skb);
548 wil_netif_rx_any(skb, ndev);
552 wil_rx_refill(wil, v->size);
555 int wil_rx_init(struct wil6210_priv *wil)
557 struct vring *vring = &wil->vring_rx;
560 vring->size = WIL6210_RX_RING_SIZE;
561 rc = wil_vring_alloc(wil, vring);
565 rc = wmi_rx_chain_add(wil, vring);
569 rc = wil_rx_refill(wil, vring->size);
575 wil_vring_free(wil, vring, 0);
580 void wil_rx_fini(struct wil6210_priv *wil)
582 struct vring *vring = &wil->vring_rx;
585 wil_vring_free(wil, vring, 0);
588 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
592 struct wmi_vring_cfg_cmd cmd = {
593 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
596 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
597 .ring_size = cpu_to_le16(size),
600 .cidxtid = mk_cidxtid(cid, tid),
601 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
606 .priority = cpu_to_le16(0),
607 .timeslot_us = cpu_to_le16(0xfff),
612 struct wil6210_mbox_hdr_wmi wmi;
613 struct wmi_vring_cfg_done_event cmd;
615 struct vring *vring = &wil->vring_tx[id];
618 wil_err(wil, "Tx ring [%d] already allocated\n", id);
624 rc = wil_vring_alloc(wil, vring);
628 wil->vring2cid_tid[id][0] = cid;
629 wil->vring2cid_tid[id][1] = tid;
631 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
633 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
634 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
638 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
639 wil_err(wil, "Tx config failed, status 0x%02x\n",
644 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
648 wil_vring_free(wil, vring, 1);
654 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
656 struct vring *vring = &wil->vring_tx[id];
661 wil_vring_free(wil, vring, 1);
664 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
668 struct ethhdr *eth = (void *)skb->data;
669 int cid = wil_find_cid(wil, eth->h_dest);
674 if (!wil->sta[cid].data_port_open &&
675 (skb->protocol != cpu_to_be16(ETH_P_PAE)))
678 /* TODO: fix for multiple TID */
679 for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
680 if (wil->vring2cid_tid[i][0] == cid) {
681 struct vring *v = &wil->vring_tx[i];
682 wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n",
683 __func__, eth->h_dest, i);
687 wil_dbg_txrx(wil, "vring[%d] not valid\n", i);
696 static void wil_set_da_for_vring(struct wil6210_priv *wil,
697 struct sk_buff *skb, int vring_index)
699 struct ethhdr *eth = (void *)skb->data;
700 int cid = wil->vring2cid_tid[vring_index][0];
701 memcpy(eth->h_dest, wil->sta[cid].addr, ETH_ALEN);
704 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
705 struct sk_buff *skb);
707 * Find 1-st vring and return it; set dest address for this vring in skb
708 * duplicate skb and send it to other active vrings
710 static struct vring *wil_tx_bcast(struct wil6210_priv *wil,
713 struct vring *v, *v2;
714 struct sk_buff *skb2;
718 /* find 1-st vring eligible for data */
719 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
720 v = &wil->vring_tx[i];
724 cid = wil->vring2cid_tid[i][0];
725 if (!wil->sta[cid].data_port_open)
731 wil_err(wil, "Tx while no vrings active?\n");
736 wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
737 wil_set_da_for_vring(wil, skb, i);
739 /* find other active vrings and duplicate skb for each */
740 for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
741 v2 = &wil->vring_tx[i];
744 cid = wil->vring2cid_tid[i][0];
745 if (!wil->sta[cid].data_port_open)
748 skb2 = skb_copy(skb, GFP_ATOMIC);
750 wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
751 wil_set_da_for_vring(wil, skb2, i);
752 wil_tx_vring(wil, v2, skb2);
754 wil_err(wil, "skb_copy failed\n");
761 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
764 wil_desc_addr_set(&d->dma.addr, pa);
765 d->dma.ip_length = 0;
766 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
767 d->dma.b11 = 0/*14 | BIT(7)*/;
769 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
770 d->dma.length = cpu_to_le16((u16)len);
771 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
775 d->mac.ucode_cmd = 0;
776 /* use dst index 0 */
777 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
778 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
779 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
780 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
781 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
787 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
789 d->mac.d[2] |= ((nr_frags + 1) <<
790 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
793 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
794 struct vring_tx_desc *d,
799 if (skb->ip_summed != CHECKSUM_PARTIAL)
802 d->dma.b11 = ETH_HLEN; /* MAC header length */
804 switch (skb->protocol) {
805 case cpu_to_be16(ETH_P_IP):
806 protocol = ip_hdr(skb)->protocol;
807 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
809 case cpu_to_be16(ETH_P_IPV6):
810 protocol = ipv6_hdr(skb)->nexthdr;
818 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
819 /* L4 header len: TCP header length */
821 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
824 /* L4 header len: UDP header length */
826 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
832 d->dma.ip_length = skb_network_header_len(skb);
833 /* Enable TCP/UDP checksum */
834 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
835 /* Calculate pseudo-header */
836 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
841 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
844 struct device *dev = wil_to_dev(wil);
845 struct vring_tx_desc dd, *d = ⅆ
846 volatile struct vring_tx_desc *_d;
847 u32 swhead = vring->swhead;
848 int avail = wil_vring_avail_tx(vring);
849 int nr_frags = skb_shinfo(skb)->nr_frags;
851 int vring_index = vring - wil->vring_tx;
855 wil_dbg_txrx(wil, "%s()\n", __func__);
857 if (avail < 1 + nr_frags) {
858 wil_err(wil, "Tx ring full. No space for %d fragments\n",
862 _d = &(vring->va[i].tx);
864 pa = dma_map_single(dev, skb->data,
865 skb_headlen(skb), DMA_TO_DEVICE);
867 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
868 skb->data, (unsigned long long)pa);
869 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
870 skb->data, skb_headlen(skb), false);
872 if (unlikely(dma_mapping_error(dev, pa)))
874 vring->ctx[i].mapped_as = wil_mapped_as_single;
876 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
877 /* Process TCP/UDP checksum offloading */
878 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
879 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
884 vring->ctx[i].nr_frags = nr_frags;
885 wil_tx_desc_set_nr_frags(d, nr_frags);
889 /* middle segments */
890 for (; f < nr_frags; f++) {
891 const struct skb_frag_struct *frag =
892 &skb_shinfo(skb)->frags[f];
893 int len = skb_frag_size(frag);
894 i = (swhead + f + 1) % vring->size;
895 _d = &(vring->va[i].tx);
896 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
898 if (unlikely(dma_mapping_error(dev, pa)))
900 vring->ctx[i].mapped_as = wil_mapped_as_page;
901 wil_tx_desc_map(d, pa, len, vring_index);
902 /* no need to check return code -
903 * if it succeeded for 1-st descriptor,
904 * it will succeed here too
906 wil_tx_desc_offload_cksum_set(wil, d, skb);
909 /* for the last seg only */
910 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
911 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
912 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
915 /* hold reference to skb
916 * to prevent skb release before accounting
917 * in case of immediate "tx done"
919 vring->ctx[i].skb = skb_get(skb);
921 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
922 (const void *)d, sizeof(*d), false);
925 wil_vring_advance_head(vring, nr_frags + 1);
926 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
927 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
928 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
932 /* unmap what we have mapped */
933 nr_frags = f + 1; /* frags mapped + one for skb head */
934 for (f = 0; f < nr_frags; f++) {
937 i = (swhead + f) % vring->size;
938 ctx = &vring->ctx[i];
939 _d = &(vring->va[i].tx);
941 _d->dma.status = TX_DMA_STATUS_DU;
942 wil_txdesc_unmap(dev, d, ctx);
945 dev_kfree_skb_any(ctx->skb);
947 memset(ctx, 0, sizeof(*ctx));
954 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
956 struct wil6210_priv *wil = ndev_to_wil(ndev);
957 struct ethhdr *eth = (void *)skb->data;
959 static bool pr_once_fw;
962 wil_dbg_txrx(wil, "%s()\n", __func__);
963 if (!test_bit(wil_status_fwready, &wil->status)) {
965 wil_err(wil, "FW not ready\n");
970 if (!test_bit(wil_status_fwconnected, &wil->status)) {
971 wil_err(wil, "FW not connected\n");
974 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
975 wil_err(wil, "Xmit in monitor mode not supported\n");
981 if (is_unicast_ether_addr(eth->h_dest)) {
982 vring = wil_find_tx_vring(wil, skb);
984 vring = wil_tx_bcast(wil, skb);
987 wil_err(wil, "No Tx VRING found for %pM\n", eth->h_dest);
990 /* set up vring entry */
991 rc = wil_tx_vring(wil, vring, skb);
993 /* do we still have enough room in the vring? */
994 if (wil_vring_avail_tx(vring) < vring->size/8)
995 netif_tx_stop_all_queues(wil_to_ndev(wil));
999 /* statistics will be updated on the tx_complete */
1000 dev_kfree_skb_any(skb);
1001 return NETDEV_TX_OK;
1003 return NETDEV_TX_BUSY;
1005 break; /* goto drop; */
1008 ndev->stats.tx_dropped++;
1009 dev_kfree_skb_any(skb);
1011 return NET_XMIT_DROP;
1015 * Clean up transmitted skb's from the Tx VRING
1017 * Return number of descriptors cleared
1019 * Safe to call from IRQ
1021 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1023 struct net_device *ndev = wil_to_ndev(wil);
1024 struct device *dev = wil_to_dev(wil);
1025 struct vring *vring = &wil->vring_tx[ringid];
1027 int cid = wil->vring2cid_tid[ringid][0];
1028 struct wil_net_stats *stats = &wil->sta[cid].stats;
1029 volatile struct vring_tx_desc *_d;
1032 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1036 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1038 while (!wil_vring_is_empty(vring)) {
1040 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1042 * For the fragmented skb, HW will set DU bit only for the
1043 * last fragment. look for it
1045 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1046 /* TODO: check we are not past head */
1048 _d = &vring->va[lf].tx;
1049 if (!(_d->dma.status & TX_DMA_STATUS_DU))
1052 new_swtail = (lf + 1) % vring->size;
1053 while (vring->swtail != new_swtail) {
1054 struct vring_tx_desc dd, *d = ⅆ
1056 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1057 struct sk_buff *skb = ctx->skb;
1058 _d = &vring->va[vring->swtail].tx;
1062 dmalen = le16_to_cpu(d->dma.length);
1063 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1066 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1067 vring->swtail, dmalen, d->dma.status,
1069 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
1070 (const void *)d, sizeof(*d), false);
1072 wil_txdesc_unmap(dev, d, ctx);
1075 if (d->dma.error == 0) {
1076 ndev->stats.tx_packets++;
1077 stats->tx_packets++;
1078 ndev->stats.tx_bytes += skb->len;
1079 stats->tx_bytes += skb->len;
1081 ndev->stats.tx_errors++;
1085 dev_kfree_skb_any(skb);
1087 memset(ctx, 0, sizeof(*ctx));
1088 /* There is no need to touch HW descriptor:
1089 * - ststus bit TX_DMA_STATUS_DU is set by design,
1090 * so hardware will not try to process this desc.,
1091 * - rest of descriptor will be initialized on Tx.
1093 vring->swtail = wil_vring_next_tail(vring);
1097 if (wil_vring_avail_tx(vring) > vring->size/4)
1098 netif_tx_wake_all_queues(wil_to_ndev(wil));