2 * Copyright (c) 2012-2014 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;
57 * Available space in Tx Vring
59 static inline int wil_vring_avail_tx(struct vring *vring)
61 u32 swhead = vring->swhead;
62 u32 swtail = vring->swtail;
63 int used = (vring->size + swhead - swtail) % vring->size;
65 return vring->size - used - 1;
69 * wil_vring_wmark_low - low watermark for available descriptor space
71 static inline int wil_vring_wmark_low(struct vring *vring)
77 * wil_vring_wmark_high - high watermark for available descriptor space
79 static inline int wil_vring_wmark_high(struct vring *vring)
84 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
86 struct device *dev = wil_to_dev(wil);
87 size_t sz = vring->size * sizeof(vring->va[0]);
90 wil_dbg_misc(wil, "%s()\n", __func__);
92 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
96 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
102 * vring->va should be aligned on its size rounded up to power of 2
103 * This is granted by the dma_alloc_coherent
105 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
111 /* initially, all descriptors are SW owned
112 * For Tx and Rx, ownership bit is at the same location, thus
115 for (i = 0; i < vring->size; i++) {
116 volatile struct vring_tx_desc *_d = &vring->va[i].tx;
118 _d->dma.status = TX_DMA_STATUS_DU;
121 wil_dbg_misc(wil, "vring[%d] 0x%p:%pad 0x%p\n", vring->size,
122 vring->va, &vring->pa, vring->ctx);
127 static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d,
130 dma_addr_t pa = wil_desc_addr(&d->dma.addr);
131 u16 dmalen = le16_to_cpu(d->dma.length);
133 switch (ctx->mapped_as) {
134 case wil_mapped_as_single:
135 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
137 case wil_mapped_as_page:
138 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
145 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
148 struct device *dev = wil_to_dev(wil);
149 size_t sz = vring->size * sizeof(vring->va[0]);
152 int vring_index = vring - wil->vring_tx;
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);
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);
163 while (!wil_vring_is_empty(vring)) {
169 struct vring_tx_desc dd, *d = ⅆ
170 volatile struct vring_tx_desc *_d =
171 &vring->va[vring->swtail].tx;
173 ctx = &vring->ctx[vring->swtail];
175 wil_txdesc_unmap(dev, d, ctx);
177 dev_kfree_skb_any(ctx->skb);
178 vring->swtail = wil_vring_next_tail(vring);
180 struct vring_rx_desc dd, *d = ⅆ
181 volatile struct vring_rx_desc *_d =
182 &vring->va[vring->swhead].rx;
184 ctx = &vring->ctx[vring->swhead];
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);
190 wil_vring_advance_head(vring, 1);
193 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
201 * Allocate one skb for Rx VRING
203 * Safe to call from IRQ
205 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
208 struct device *dev = wil_to_dev(wil);
209 unsigned int sz = mtu_max + ETH_HLEN;
210 struct vring_rx_desc dd, *d = ⅆ
211 volatile struct vring_rx_desc *_d = &vring->va[i].rx;
215 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
220 skb_reserve(skb, headroom);
223 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
224 if (unlikely(dma_mapping_error(dev, pa))) {
229 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
230 wil_desc_addr_set(&d->dma.addr, pa);
231 /* ip_length don't care */
233 /* error don't care */
234 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
235 d->dma.length = cpu_to_le16(sz);
237 vring->ctx[i].skb = skb;
243 * Adds radiotap header
245 * Any error indicated as "Bad FCS"
247 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
248 * - Rx descriptor: 32 bytes
251 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
254 struct wireless_dev *wdev = wil->wdev;
255 struct wil6210_rtap {
256 struct ieee80211_radiotap_header rthdr;
257 /* fields should be in the order of bits in rthdr.it_present */
261 __le16 chnl_freq __aligned(2);
268 struct wil6210_rtap_vendor {
269 struct wil6210_rtap rtap;
271 u8 vendor_oui[3] __aligned(2);
276 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
277 struct wil6210_rtap_vendor *rtap_vendor;
278 int rtap_len = sizeof(struct wil6210_rtap);
279 int phy_length = 0; /* phy info header size, bytes */
280 static char phy_data[128];
281 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
283 if (rtap_include_phy_info) {
284 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
285 /* calculate additional length */
286 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
288 * PHY info starts from 8-byte boundary
289 * there are 8-byte lines, last line may be partially
290 * written (HW bug), thus FW configures for last line
291 * to be excessive. Driver skips this last line.
293 int len = min_t(int, 8 + sizeof(phy_data),
294 wil_rxdesc_phy_length(d));
297 void *p = skb_tail_pointer(skb);
298 void *pa = PTR_ALIGN(p, 8);
300 if (skb_tailroom(skb) >= len + (pa - p)) {
301 phy_length = len - 8;
302 memcpy(phy_data, pa, phy_length);
306 rtap_len += phy_length;
309 if (skb_headroom(skb) < rtap_len &&
310 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
311 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
315 rtap_vendor = (void *)skb_push(skb, rtap_len);
316 memset(rtap_vendor, 0, rtap_len);
318 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
319 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
320 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
321 (1 << IEEE80211_RADIOTAP_FLAGS) |
322 (1 << IEEE80211_RADIOTAP_CHANNEL) |
323 (1 << IEEE80211_RADIOTAP_MCS));
324 if (d->dma.status & RX_DMA_STATUS_ERROR)
325 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
327 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
328 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
330 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
331 rtap_vendor->rtap.mcs_flags = 0;
332 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
334 if (rtap_include_phy_info) {
335 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
336 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
337 /* OUI for Wilocity 04:ce:14 */
338 rtap_vendor->vendor_oui[0] = 0x04;
339 rtap_vendor->vendor_oui[1] = 0xce;
340 rtap_vendor->vendor_oui[2] = 0x14;
341 rtap_vendor->vendor_ns = 1;
342 /* Rx descriptor + PHY data */
343 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
345 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
346 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
352 * Fast swap in place between 2 registers
354 static void wil_swap_u16(u16 *a, u16 *b)
361 static void wil_swap_ethaddr(void *data)
363 struct ethhdr *eth = data;
364 u16 *s = (u16 *)eth->h_source;
365 u16 *d = (u16 *)eth->h_dest;
367 wil_swap_u16(s++, d++);
368 wil_swap_u16(s++, d++);
373 * reap 1 frame from @swhead
375 * Rx descriptor copied to skb->cb
377 * Safe to call from IRQ
379 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
382 struct device *dev = wil_to_dev(wil);
383 struct net_device *ndev = wil_to_ndev(wil);
384 volatile struct vring_rx_desc *_d;
385 struct vring_rx_desc *d;
388 unsigned int sz = mtu_max + ETH_HLEN;
393 struct wil_net_stats *stats;
395 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
397 if (wil_vring_is_empty(vring))
400 _d = &vring->va[vring->swhead].rx;
401 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
402 /* it is not error, we just reached end of Rx done area */
406 skb = vring->ctx[vring->swhead].skb;
407 d = wil_skb_rxdesc(skb);
409 pa = wil_desc_addr(&d->dma.addr);
410 vring->ctx[vring->swhead].skb = NULL;
411 wil_vring_advance_head(vring, 1);
413 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
414 dmalen = le16_to_cpu(d->dma.length);
416 trace_wil6210_rx(vring->swhead, d);
417 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
418 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
419 (const void *)d, sizeof(*d), false);
422 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
426 skb_trim(skb, dmalen);
430 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
431 skb->data, skb_headlen(skb), false);
433 cid = wil_rxdesc_cid(d);
434 stats = &wil->sta[cid].stats;
435 stats->last_mcs_rx = wil_rxdesc_mcs(d);
437 /* use radiotap header only if required */
438 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
439 wil_rx_add_radiotap_header(wil, skb);
441 /* no extra checks if in sniffer mode */
442 if (ndev->type != ARPHRD_ETHER)
445 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
446 * Driver should recognize it by frame type, that is found
447 * in Rx descriptor. If type is not data, it is 802.11 frame as is
449 ftype = wil_rxdesc_ftype(d) << 2;
450 if (ftype != IEEE80211_FTYPE_DATA) {
451 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
452 /* TODO: process it */
457 if (skb->len < ETH_HLEN) {
458 wil_err(wil, "Short frame, len = %d\n", skb->len);
459 /* TODO: process it (i.e. BAR) */
464 /* L4 IDENT is on when HW calculated checksum, check status
465 * and in case of error drop the packet
466 * higher stack layers will handle retransmission (if required)
468 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
469 /* L4 protocol identified, csum calculated */
470 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
471 skb->ip_summed = CHECKSUM_UNNECESSARY;
472 /* If HW reports bad checksum, let IP stack re-check it
473 * For example, HW don't understand Microsoft IP stack that
474 * mis-calculates TCP checksum - if it should be 0x0,
475 * it writes 0xffff in violation of RFC 1624
479 ds_bits = wil_rxdesc_ds_bits(d);
482 * HW bug - in ToDS mode, i.e. Rx on AP side,
483 * addresses get swapped
485 wil_swap_ethaddr(skb->data);
492 * allocate and fill up to @count buffers in rx ring
493 * buffers posted at @swtail
495 static int wil_rx_refill(struct wil6210_priv *wil, int count)
497 struct net_device *ndev = wil_to_ndev(wil);
498 struct vring *v = &wil->vring_rx;
501 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
502 WIL6210_RTAP_SIZE : 0;
504 for (; next_tail = wil_vring_next_tail(v),
505 (next_tail != v->swhead) && (count-- > 0);
506 v->swtail = next_tail) {
507 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
509 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
514 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
520 * Pass Rx packet to the netif. Update statistics.
521 * Called in softirq context (NAPI poll).
523 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
526 struct wil6210_priv *wil = ndev_to_wil(ndev);
527 unsigned int len = skb->len;
528 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
529 int cid = wil_rxdesc_cid(d);
530 struct wil_net_stats *stats = &wil->sta[cid].stats;
534 rc = napi_gro_receive(&wil->napi_rx, skb);
536 if (unlikely(rc == GRO_DROP)) {
537 ndev->stats.rx_dropped++;
539 wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
541 ndev->stats.rx_packets++;
543 ndev->stats.rx_bytes += len;
544 stats->rx_bytes += len;
547 static const char * const gro_res_str[] = {
548 [GRO_MERGED] = "GRO_MERGED",
549 [GRO_MERGED_FREE] = "GRO_MERGED_FREE",
550 [GRO_HELD] = "GRO_HELD",
551 [GRO_NORMAL] = "GRO_NORMAL",
552 [GRO_DROP] = "GRO_DROP",
554 wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n",
555 len, gro_res_str[rc]);
560 * Proceed all completed skb's from Rx VRING
562 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
564 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
566 struct net_device *ndev = wil_to_ndev(wil);
567 struct vring *v = &wil->vring_rx;
571 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
574 wil_dbg_txrx(wil, "%s()\n", __func__);
575 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
578 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
580 skb_reset_mac_header(skb);
581 skb->ip_summed = CHECKSUM_UNNECESSARY;
582 skb->pkt_type = PACKET_OTHERHOST;
583 skb->protocol = htons(ETH_P_802_2);
584 wil_netif_rx_any(skb, ndev);
586 struct ethhdr *eth = (void *)skb->data;
588 skb->protocol = eth_type_trans(skb, ndev);
590 if (is_unicast_ether_addr(eth->h_dest))
591 wil_rx_reorder(wil, skb);
593 wil_netif_rx_any(skb, ndev);
596 wil_rx_refill(wil, v->size);
599 int wil_rx_init(struct wil6210_priv *wil, u16 size)
601 struct vring *vring = &wil->vring_rx;
604 wil_dbg_misc(wil, "%s()\n", __func__);
607 wil_err(wil, "Rx ring already allocated\n");
612 rc = wil_vring_alloc(wil, vring);
616 rc = wmi_rx_chain_add(wil, vring);
620 rc = wil_rx_refill(wil, vring->size);
626 wil_vring_free(wil, vring, 0);
631 void wil_rx_fini(struct wil6210_priv *wil)
633 struct vring *vring = &wil->vring_rx;
635 wil_dbg_misc(wil, "%s()\n", __func__);
638 wil_vring_free(wil, vring, 0);
641 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
645 struct wmi_vring_cfg_cmd cmd = {
646 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
650 cpu_to_le16(mtu_max + ETH_HLEN),
651 .ring_size = cpu_to_le16(size),
654 .cidxtid = mk_cidxtid(cid, tid),
655 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
660 .priority = cpu_to_le16(0),
661 .timeslot_us = cpu_to_le16(0xfff),
666 struct wil6210_mbox_hdr_wmi wmi;
667 struct wmi_vring_cfg_done_event cmd;
669 struct vring *vring = &wil->vring_tx[id];
670 struct vring_tx_data *txdata = &wil->vring_tx_data[id];
672 wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
673 cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
676 wil_err(wil, "Tx ring [%d] already allocated\n", id);
681 memset(txdata, 0, sizeof(*txdata));
683 rc = wil_vring_alloc(wil, vring);
687 wil->vring2cid_tid[id][0] = cid;
688 wil->vring2cid_tid[id][1] = tid;
690 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
692 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
693 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
697 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
698 wil_err(wil, "Tx config failed, status 0x%02x\n",
703 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
709 wil_vring_free(wil, vring, 1);
715 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
717 struct vring *vring = &wil->vring_tx[id];
719 WARN_ON(!mutex_is_locked(&wil->mutex));
724 wil_dbg_misc(wil, "%s() id=%d\n", __func__, id);
726 /* make sure NAPI won't touch this vring */
727 wil->vring_tx_data[id].enabled = 0;
728 if (test_bit(wil_status_napi_en, &wil->status))
729 napi_synchronize(&wil->napi_tx);
731 wil_vring_free(wil, vring, 1);
734 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
738 struct ethhdr *eth = (void *)skb->data;
739 int cid = wil_find_cid(wil, eth->h_dest);
744 if (!wil->sta[cid].data_port_open &&
745 (skb->protocol != cpu_to_be16(ETH_P_PAE)))
748 /* TODO: fix for multiple TID */
749 for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
750 if (wil->vring2cid_tid[i][0] == cid) {
751 struct vring *v = &wil->vring_tx[i];
753 wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n",
754 __func__, eth->h_dest, i);
758 wil_dbg_txrx(wil, "vring[%d] not valid\n", i);
767 static void wil_set_da_for_vring(struct wil6210_priv *wil,
768 struct sk_buff *skb, int vring_index)
770 struct ethhdr *eth = (void *)skb->data;
771 int cid = wil->vring2cid_tid[vring_index][0];
773 memcpy(eth->h_dest, wil->sta[cid].addr, ETH_ALEN);
776 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
777 struct sk_buff *skb);
779 * Find 1-st vring and return it; set dest address for this vring in skb
780 * duplicate skb and send it to other active vrings
782 static struct vring *wil_tx_bcast(struct wil6210_priv *wil,
785 struct vring *v, *v2;
786 struct sk_buff *skb2;
790 /* find 1-st vring eligible for data */
791 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
792 v = &wil->vring_tx[i];
796 cid = wil->vring2cid_tid[i][0];
797 if (!wil->sta[cid].data_port_open)
803 wil_dbg_txrx(wil, "Tx while no vrings active?\n");
808 wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
809 wil_set_da_for_vring(wil, skb, i);
811 /* find other active vrings and duplicate skb for each */
812 for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
813 v2 = &wil->vring_tx[i];
816 cid = wil->vring2cid_tid[i][0];
817 if (!wil->sta[cid].data_port_open)
820 skb2 = skb_copy(skb, GFP_ATOMIC);
822 wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
823 wil_set_da_for_vring(wil, skb2, i);
824 wil_tx_vring(wil, v2, skb2);
826 wil_err(wil, "skb_copy failed\n");
833 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
836 wil_desc_addr_set(&d->dma.addr, pa);
837 d->dma.ip_length = 0;
838 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
839 d->dma.b11 = 0/*14 | BIT(7)*/;
841 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
842 d->dma.length = cpu_to_le16((u16)len);
843 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
847 d->mac.ucode_cmd = 0;
848 /* use dst index 0 */
849 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
850 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
851 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
852 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
853 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
859 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
861 d->mac.d[2] |= ((nr_frags + 1) <<
862 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
865 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
866 struct vring_tx_desc *d,
871 if (skb->ip_summed != CHECKSUM_PARTIAL)
874 d->dma.b11 = ETH_HLEN; /* MAC header length */
876 switch (skb->protocol) {
877 case cpu_to_be16(ETH_P_IP):
878 protocol = ip_hdr(skb)->protocol;
879 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
881 case cpu_to_be16(ETH_P_IPV6):
882 protocol = ipv6_hdr(skb)->nexthdr;
890 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
891 /* L4 header len: TCP header length */
893 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
896 /* L4 header len: UDP header length */
898 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
904 d->dma.ip_length = skb_network_header_len(skb);
905 /* Enable TCP/UDP checksum */
906 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
907 /* Calculate pseudo-header */
908 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
913 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
916 struct device *dev = wil_to_dev(wil);
917 struct vring_tx_desc dd, *d = ⅆ
918 volatile struct vring_tx_desc *_d;
919 u32 swhead = vring->swhead;
920 int avail = wil_vring_avail_tx(vring);
921 int nr_frags = skb_shinfo(skb)->nr_frags;
923 int vring_index = vring - wil->vring_tx;
924 struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
928 wil_dbg_txrx(wil, "%s()\n", __func__);
930 if (avail < 1 + nr_frags) {
931 wil_err_ratelimited(wil,
932 "Tx ring full. No space for %d fragments\n",
936 _d = &vring->va[i].tx;
938 pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
940 wil_dbg_txrx(wil, "Tx skb %d bytes 0x%p -> %pad\n", skb_headlen(skb),
942 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
943 skb->data, skb_headlen(skb), false);
945 if (unlikely(dma_mapping_error(dev, pa)))
947 vring->ctx[i].mapped_as = wil_mapped_as_single;
949 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
950 /* Process TCP/UDP checksum offloading */
951 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
952 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
957 vring->ctx[i].nr_frags = nr_frags;
958 wil_tx_desc_set_nr_frags(d, nr_frags);
962 /* middle segments */
963 for (; f < nr_frags; f++) {
964 const struct skb_frag_struct *frag =
965 &skb_shinfo(skb)->frags[f];
966 int len = skb_frag_size(frag);
968 i = (swhead + f + 1) % vring->size;
969 _d = &vring->va[i].tx;
970 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
972 if (unlikely(dma_mapping_error(dev, pa)))
974 vring->ctx[i].mapped_as = wil_mapped_as_page;
975 wil_tx_desc_map(d, pa, len, vring_index);
976 /* no need to check return code -
977 * if it succeeded for 1-st descriptor,
978 * it will succeed here too
980 wil_tx_desc_offload_cksum_set(wil, d, skb);
983 /* for the last seg only */
984 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
985 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
986 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
989 /* hold reference to skb
990 * to prevent skb release before accounting
991 * in case of immediate "tx done"
993 vring->ctx[i].skb = skb_get(skb);
995 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
996 (const void *)d, sizeof(*d), false);
998 if (wil_vring_is_empty(vring)) /* performance monitoring */
999 txdata->idle += get_cycles() - txdata->last_idle;
1001 /* advance swhead */
1002 wil_vring_advance_head(vring, nr_frags + 1);
1003 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
1004 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
1005 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
1009 /* unmap what we have mapped */
1010 nr_frags = f + 1; /* frags mapped + one for skb head */
1011 for (f = 0; f < nr_frags; f++) {
1012 struct wil_ctx *ctx;
1014 i = (swhead + f) % vring->size;
1015 ctx = &vring->ctx[i];
1016 _d = &vring->va[i].tx;
1018 _d->dma.status = TX_DMA_STATUS_DU;
1019 wil_txdesc_unmap(dev, d, ctx);
1022 dev_kfree_skb_any(ctx->skb);
1024 memset(ctx, 0, sizeof(*ctx));
1030 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1032 struct wil6210_priv *wil = ndev_to_wil(ndev);
1033 struct ethhdr *eth = (void *)skb->data;
1034 struct vring *vring;
1035 static bool pr_once_fw;
1038 wil_dbg_txrx(wil, "%s()\n", __func__);
1039 if (!test_bit(wil_status_fwready, &wil->status)) {
1041 wil_err(wil, "FW not ready\n");
1046 if (!test_bit(wil_status_fwconnected, &wil->status)) {
1047 wil_err(wil, "FW not connected\n");
1050 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
1051 wil_err(wil, "Xmit in monitor mode not supported\n");
1057 if (is_unicast_ether_addr(eth->h_dest))
1058 vring = wil_find_tx_vring(wil, skb);
1060 vring = wil_tx_bcast(wil, skb);
1062 wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest);
1066 /* set up vring entry */
1067 rc = wil_tx_vring(wil, vring, skb);
1069 /* do we still have enough room in the vring? */
1070 if (wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring)) {
1071 netif_tx_stop_all_queues(wil_to_ndev(wil));
1072 wil_dbg_txrx(wil, "netif_tx_stop : ring full\n");
1077 /* statistics will be updated on the tx_complete */
1078 dev_kfree_skb_any(skb);
1079 return NETDEV_TX_OK;
1081 return NETDEV_TX_BUSY;
1083 break; /* goto drop; */
1086 ndev->stats.tx_dropped++;
1087 dev_kfree_skb_any(skb);
1089 return NET_XMIT_DROP;
1093 * Clean up transmitted skb's from the Tx VRING
1095 * Return number of descriptors cleared
1097 * Safe to call from IRQ
1099 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1101 struct net_device *ndev = wil_to_ndev(wil);
1102 struct device *dev = wil_to_dev(wil);
1103 struct vring *vring = &wil->vring_tx[ringid];
1104 struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
1106 int cid = wil->vring2cid_tid[ringid][0];
1107 struct wil_net_stats *stats = &wil->sta[cid].stats;
1108 volatile struct vring_tx_desc *_d;
1111 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1115 if (!txdata->enabled) {
1116 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
1120 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1122 while (!wil_vring_is_empty(vring)) {
1124 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1126 * For the fragmented skb, HW will set DU bit only for the
1127 * last fragment. look for it
1129 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1130 /* TODO: check we are not past head */
1132 _d = &vring->va[lf].tx;
1133 if (!(_d->dma.status & TX_DMA_STATUS_DU))
1136 new_swtail = (lf + 1) % vring->size;
1137 while (vring->swtail != new_swtail) {
1138 struct vring_tx_desc dd, *d = ⅆ
1140 struct sk_buff *skb;
1142 ctx = &vring->ctx[vring->swtail];
1144 _d = &vring->va[vring->swtail].tx;
1148 dmalen = le16_to_cpu(d->dma.length);
1149 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1152 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1153 vring->swtail, dmalen, d->dma.status,
1155 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
1156 (const void *)d, sizeof(*d), false);
1158 wil_txdesc_unmap(dev, d, ctx);
1161 if (d->dma.error == 0) {
1162 ndev->stats.tx_packets++;
1163 stats->tx_packets++;
1164 ndev->stats.tx_bytes += skb->len;
1165 stats->tx_bytes += skb->len;
1167 ndev->stats.tx_errors++;
1171 dev_kfree_skb_any(skb);
1173 memset(ctx, 0, sizeof(*ctx));
1174 /* There is no need to touch HW descriptor:
1175 * - ststus bit TX_DMA_STATUS_DU is set by design,
1176 * so hardware will not try to process this desc.,
1177 * - rest of descriptor will be initialized on Tx.
1179 vring->swtail = wil_vring_next_tail(vring);
1184 if (wil_vring_is_empty(vring)) { /* performance monitoring */
1185 wil_dbg_txrx(wil, "Ring[%2d] empty\n", ringid);
1186 txdata->last_idle = get_cycles();
1189 if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) {
1190 wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n");
1191 netif_tx_wake_all_queues(wil_to_ndev(wil));