1 /******************************************************************************
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of version 2 of the GNU General Public License as
14 * published by the Free Software Foundation.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * The full GNU General Public License is included in this distribution
22 * in the file called COPYING.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
32 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
33 * All rights reserved.
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
39 * * Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * * Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in
43 * the documentation and/or other materials provided with the
45 * * Neither the name Intel Corporation nor the names of its
46 * contributors may be used to endorse or promote products derived
47 * from this software without specific prior written permission.
49 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
50 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
51 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
52 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
53 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
59 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
60 *****************************************************************************/
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
63 #include "iwl-trans.h"
67 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb,
68 int queue, struct ieee80211_sta *sta)
70 struct iwl_mvm_sta *mvmsta;
71 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
72 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb);
73 struct iwl_mvm_key_pn *ptk_pn;
75 u8 pn[IEEE80211_CCMP_PN_LEN];
80 /* multicast and non-data only arrives on default queue */
81 if (!ieee80211_is_data(hdr->frame_control) ||
82 is_multicast_ether_addr(hdr->addr1))
85 /* do not check PN for open AP */
86 if (!(stats->flag & RX_FLAG_DECRYPTED))
90 * avoid checking for default queue - we don't want to replicate
91 * all the logic that's necessary for checking the PN on fragmented
92 * frames, leave that to mac80211
97 /* if we are here - this for sure is either CCMP or GCMP */
98 if (IS_ERR_OR_NULL(sta)) {
100 "expected hw-decrypted unicast frame for station\n");
104 mvmsta = iwl_mvm_sta_from_mac80211(sta);
106 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
107 keyidx = extiv[3] >> 6;
109 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]);
113 if (ieee80211_is_data_qos(hdr->frame_control))
114 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
118 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */
119 if (tid >= IWL_MAX_TID_COUNT)
130 if (memcmp(pn, ptk_pn->q[queue].pn[tid],
131 IEEE80211_CCMP_PN_LEN) <= 0)
134 if (!(stats->flag & RX_FLAG_AMSDU_MORE))
135 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN);
136 stats->flag |= RX_FLAG_PN_VALIDATED;
141 /* iwl_mvm_create_skb Adds the rxb to a new skb */
142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr,
143 u16 len, u8 crypt_len,
144 struct iwl_rx_cmd_buffer *rxb)
146 struct iwl_rx_packet *pkt = rxb_addr(rxb);
147 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
148 unsigned int headlen, fraglen, pad_len = 0;
149 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
151 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) {
155 * If the device inserted padding it means that (it thought)
156 * the 802.11 header wasn't a multiple of 4 bytes long. In
157 * this case, reserve two bytes at the start of the SKB to
158 * align the payload properly in case we end up copying it.
160 skb_reserve(skb, pad_len);
164 /* If frame is small enough to fit in skb->head, pull it completely.
165 * If not, only pull ieee80211_hdr (including crypto if present, and
166 * an additional 8 bytes for SNAP/ethertype, see below) so that
167 * splice() or TCP coalesce are more efficient.
169 * Since, in addition, ieee80211_data_to_8023() always pull in at
170 * least 8 bytes (possibly more for mesh) we can do the same here
171 * to save the cost of doing it later. That still doesn't pull in
172 * the actual IP header since the typical case has a SNAP header.
173 * If the latter changes (there are efforts in the standards group
174 * to do so) we should revisit this and ieee80211_data_to_8023().
176 headlen = (len <= skb_tailroom(skb)) ? len :
177 hdrlen + crypt_len + 8;
179 /* The firmware may align the packet to DWORD.
180 * The padding is inserted after the IV.
181 * After copying the header + IV skip the padding if
182 * present before copying packet data.
185 skb_put_data(skb, hdr, hdrlen);
186 skb_put_data(skb, (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen);
188 fraglen = len - headlen;
191 int offset = (void *)hdr + headlen + pad_len -
192 rxb_addr(rxb) + rxb_offset(rxb);
194 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
195 fraglen, rxb->truesize);
199 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
200 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
201 struct napi_struct *napi,
202 struct sk_buff *skb, int queue,
203 struct ieee80211_sta *sta)
205 if (iwl_mvm_check_pn(mvm, skb, queue, sta))
208 ieee80211_rx_napi(mvm->hw, sta, skb, napi);
211 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
212 struct iwl_rx_mpdu_desc *desc,
213 struct ieee80211_rx_status *rx_status)
215 int energy_a, energy_b, max_energy;
217 energy_a = desc->energy_a;
218 energy_a = energy_a ? -energy_a : S8_MIN;
219 energy_b = desc->energy_b;
220 energy_b = energy_b ? -energy_b : S8_MIN;
221 max_energy = max(energy_a, energy_b);
223 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n",
224 energy_a, energy_b, max_energy);
226 rx_status->signal = max_energy;
227 rx_status->chains = 0; /* TODO: phy info */
228 rx_status->chain_signal[0] = energy_a;
229 rx_status->chain_signal[1] = energy_b;
230 rx_status->chain_signal[2] = S8_MIN;
233 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
234 struct ieee80211_rx_status *stats,
235 struct iwl_rx_mpdu_desc *desc, int queue,
238 u16 status = le16_to_cpu(desc->status);
240 if (!ieee80211_has_protected(hdr->frame_control) ||
241 (status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
242 IWL_RX_MPDU_STATUS_SEC_NONE)
245 /* TODO: handle packets encrypted with unknown alg */
247 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) {
248 case IWL_RX_MPDU_STATUS_SEC_CCM:
249 case IWL_RX_MPDU_STATUS_SEC_GCM:
250 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN);
251 /* alg is CCM: check MIC only */
252 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
255 stats->flag |= RX_FLAG_DECRYPTED;
256 *crypt_len = IEEE80211_CCMP_HDR_LEN;
258 case IWL_RX_MPDU_STATUS_SEC_TKIP:
259 /* Don't drop the frame and decrypt it in SW */
260 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK))
263 *crypt_len = IEEE80211_TKIP_IV_LEN;
264 /* fall through if TTAK OK */
265 case IWL_RX_MPDU_STATUS_SEC_WEP:
266 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK))
269 stats->flag |= RX_FLAG_DECRYPTED;
270 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) ==
271 IWL_RX_MPDU_STATUS_SEC_WEP)
272 *crypt_len = IEEE80211_WEP_IV_LEN;
274 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC:
275 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK))
277 stats->flag |= RX_FLAG_DECRYPTED;
280 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status);
286 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
288 struct iwl_rx_mpdu_desc *desc)
290 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
291 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
292 u16 flags = le16_to_cpu(desc->l3l4_flags);
293 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >>
294 IWL_RX_L3_PROTO_POS);
296 if (mvmvif->features & NETIF_F_RXCSUM &&
297 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK &&
298 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK ||
299 l3_prot == IWL_RX_L3_TYPE_IPV6 ||
300 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG))
301 skb->ip_summed = CHECKSUM_UNNECESSARY;
305 * returns true if a packet outside BA session is a duplicate and
308 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue,
309 struct ieee80211_rx_status *rx_status,
310 struct ieee80211_hdr *hdr,
311 struct iwl_rx_mpdu_desc *desc)
313 struct iwl_mvm_sta *mvm_sta;
314 struct iwl_mvm_rxq_dup_data *dup_data;
315 u8 baid, tid, sub_frame_idx;
317 if (WARN_ON(IS_ERR_OR_NULL(sta)))
320 baid = (le32_to_cpu(desc->reorder_data) &
321 IWL_RX_MPDU_REORDER_BAID_MASK) >>
322 IWL_RX_MPDU_REORDER_BAID_SHIFT;
324 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID)
327 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
328 dup_data = &mvm_sta->dup_data[queue];
331 * Drop duplicate 802.11 retransmissions
332 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
334 if (ieee80211_is_ctl(hdr->frame_control) ||
335 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
336 is_multicast_ether_addr(hdr->addr1)) {
337 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
341 if (ieee80211_is_data_qos(hdr->frame_control))
342 /* frame has qos control */
343 tid = *ieee80211_get_qos_ctl(hdr) &
344 IEEE80211_QOS_CTL_TID_MASK;
346 tid = IWL_MAX_TID_COUNT;
348 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */
349 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
351 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
352 dup_data->last_seq[tid] == hdr->seq_ctrl &&
353 dup_data->last_sub_frame[tid] >= sub_frame_idx))
356 dup_data->last_seq[tid] = hdr->seq_ctrl;
357 dup_data->last_sub_frame[tid] = sub_frame_idx;
359 rx_status->flag |= RX_FLAG_DUP_VALIDATED;
364 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask,
365 const u8 *data, u32 count)
367 struct iwl_rxq_sync_cmd *cmd;
368 u32 data_size = sizeof(*cmd) + count;
371 /* should be DWORD aligned */
372 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE))
375 cmd = kzalloc(data_size, GFP_KERNEL);
379 cmd->rxq_mask = cpu_to_le32(rxq_mask);
380 cmd->count = cpu_to_le32(count);
382 memcpy(cmd->payload, data, count);
384 ret = iwl_mvm_send_cmd_pdu(mvm,
385 WIDE_ID(DATA_PATH_GROUP,
386 TRIGGER_RX_QUEUES_NOTIF_CMD),
394 * Returns true if sn2 - buffer_size < sn1 < sn2.
395 * To be used only in order to compare reorder buffer head with NSSN.
396 * We fully trust NSSN unless it is behind us due to reorder timeout.
397 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN.
399 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size)
401 return ieee80211_sn_less(sn1, sn2) &&
402 !ieee80211_sn_less(sn1, sn2 - buffer_size);
405 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
407 static void iwl_mvm_release_frames(struct iwl_mvm *mvm,
408 struct ieee80211_sta *sta,
409 struct napi_struct *napi,
410 struct iwl_mvm_reorder_buffer *reorder_buf,
413 u16 ssn = reorder_buf->head_sn;
415 lockdep_assert_held(&reorder_buf->lock);
417 /* ignore nssn smaller than head sn - this can happen due to timeout */
418 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size))
421 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) {
422 int index = ssn % reorder_buf->buf_size;
423 struct sk_buff_head *skb_list = &reorder_buf->entries[index];
426 ssn = ieee80211_sn_inc(ssn);
429 * Empty the list. Will have more than one frame for A-MSDU.
430 * Empty list is valid as well since nssn indicates frames were
433 while ((skb = __skb_dequeue(skb_list))) {
434 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb,
437 reorder_buf->num_stored--;
440 reorder_buf->head_sn = nssn;
443 if (reorder_buf->num_stored && !reorder_buf->removed) {
444 u16 index = reorder_buf->head_sn % reorder_buf->buf_size;
446 while (skb_queue_empty(&reorder_buf->entries[index]))
447 index = (index + 1) % reorder_buf->buf_size;
448 /* modify timer to match next frame's expiration time */
449 mod_timer(&reorder_buf->reorder_timer,
450 reorder_buf->reorder_time[index] + 1 +
451 RX_REORDER_BUF_TIMEOUT_MQ);
453 del_timer(&reorder_buf->reorder_timer);
457 void iwl_mvm_reorder_timer_expired(unsigned long data)
459 struct iwl_mvm_reorder_buffer *buf = (void *)data;
461 u16 sn = 0, index = 0;
462 bool expired = false;
465 spin_lock(&buf->lock);
467 if (!buf->num_stored || buf->removed) {
468 spin_unlock(&buf->lock);
472 for (i = 0; i < buf->buf_size ; i++) {
473 index = (buf->head_sn + i) % buf->buf_size;
475 if (skb_queue_empty(&buf->entries[index])) {
477 * If there is a hole and the next frame didn't expire
478 * we want to break and not advance SN
483 if (!cont && !time_after(jiffies, buf->reorder_time[index] +
484 RX_REORDER_BUF_TIMEOUT_MQ))
488 /* continue until next hole after this expired frames */
490 sn = ieee80211_sn_add(buf->head_sn, i + 1);
494 struct ieee80211_sta *sta;
497 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]);
498 /* SN is set to the last expired frame + 1 */
499 IWL_DEBUG_HT(buf->mvm,
500 "Releasing expired frames for sta %u, sn %d\n",
502 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn);
506 * If no frame expired and there are stored frames, index is now
507 * pointing to the first unexpired frame - modify timer
508 * accordingly to this frame.
510 mod_timer(&buf->reorder_timer,
511 buf->reorder_time[index] +
512 1 + RX_REORDER_BUF_TIMEOUT_MQ);
514 spin_unlock(&buf->lock);
517 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue,
518 struct iwl_mvm_delba_data *data)
520 struct iwl_mvm_baid_data *ba_data;
521 struct ieee80211_sta *sta;
522 struct iwl_mvm_reorder_buffer *reorder_buf;
523 u8 baid = data->baid;
525 if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid))
530 ba_data = rcu_dereference(mvm->baid_map[baid]);
531 if (WARN_ON_ONCE(!ba_data))
534 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
535 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
538 reorder_buf = &ba_data->reorder_buf[queue];
540 /* release all frames that are in the reorder buffer to the stack */
541 spin_lock_bh(&reorder_buf->lock);
542 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf,
543 ieee80211_sn_add(reorder_buf->head_sn,
544 reorder_buf->buf_size));
545 spin_unlock_bh(&reorder_buf->lock);
546 del_timer_sync(&reorder_buf->reorder_timer);
552 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
555 struct iwl_rx_packet *pkt = rxb_addr(rxb);
556 struct iwl_rxq_sync_notification *notif;
557 struct iwl_mvm_internal_rxq_notif *internal_notif;
559 notif = (void *)pkt->data;
560 internal_notif = (void *)notif->payload;
562 if (internal_notif->sync) {
563 if (mvm->queue_sync_cookie != internal_notif->cookie) {
565 "Received expired RX queue sync message\n");
568 if (!atomic_dec_return(&mvm->queue_sync_counter))
569 wake_up(&mvm->rx_sync_waitq);
572 switch (internal_notif->type) {
573 case IWL_MVM_RXQ_EMPTY:
575 case IWL_MVM_RXQ_NOTIF_DEL_BA:
576 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data);
579 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type);
584 * Returns true if the MPDU was buffered\dropped, false if it should be passed
587 static bool iwl_mvm_reorder(struct iwl_mvm *mvm,
588 struct napi_struct *napi,
590 struct ieee80211_sta *sta,
592 struct iwl_rx_mpdu_desc *desc)
594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
595 struct iwl_mvm_sta *mvm_sta;
596 struct iwl_mvm_baid_data *baid_data;
597 struct iwl_mvm_reorder_buffer *buffer;
598 struct sk_buff *tail;
599 u32 reorder = le32_to_cpu(desc->reorder_data);
600 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU;
602 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME;
603 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
604 u8 sub_frame_idx = desc->amsdu_info &
605 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK;
610 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >>
611 IWL_RX_MPDU_REORDER_BAID_SHIFT;
614 * This also covers the case of receiving a Block Ack Request
615 * outside a BA session; we'll pass it to mac80211 and that
616 * then sends a delBA action frame.
618 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID)
622 if (WARN_ON(IS_ERR_OR_NULL(sta)))
625 mvm_sta = iwl_mvm_sta_from_mac80211(sta);
627 /* not a data packet or a bar */
628 if (!ieee80211_is_back_req(hdr->frame_control) &&
629 (!ieee80211_is_data_qos(hdr->frame_control) ||
630 is_multicast_ether_addr(hdr->addr1)))
633 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
636 baid_data = rcu_dereference(mvm->baid_map[baid]);
639 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
644 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id,
645 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n",
646 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id,
650 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK;
651 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >>
652 IWL_RX_MPDU_REORDER_SN_SHIFT;
654 buffer = &baid_data->reorder_buf[queue];
656 spin_lock_bh(&buffer->lock);
658 if (!buffer->valid) {
659 if (reorder & IWL_RX_MPDU_REORDER_BA_OLD_SN) {
660 spin_unlock_bh(&buffer->lock);
663 buffer->valid = true;
666 if (ieee80211_is_back_req(hdr->frame_control)) {
667 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
672 * If there was a significant jump in the nssn - adjust.
673 * If the SN is smaller than the NSSN it might need to first go into
674 * the reorder buffer, in which case we just release up to it and the
675 * rest of the function will take care of storing it and releasing up to
678 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size,
680 !ieee80211_sn_less(sn, buffer->head_sn + buffer->buf_size)) {
681 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn;
683 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn);
686 /* drop any oudated packets */
687 if (ieee80211_sn_less(sn, buffer->head_sn))
690 /* release immediately if allowed by nssn and no stored frames */
691 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) {
692 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn,
694 (!amsdu || last_subframe))
695 buffer->head_sn = nssn;
696 /* No need to update AMSDU last SN - we are moving the head */
697 spin_unlock_bh(&buffer->lock);
701 index = sn % buffer->buf_size;
704 * Check if we already stored this frame
705 * As AMSDU is either received or not as whole, logic is simple:
706 * If we have frames in that position in the buffer and the last frame
707 * originated from AMSDU had a different SN then it is a retransmission.
708 * If it is the same SN then if the subframe index is incrementing it
709 * is the same AMSDU - otherwise it is a retransmission.
711 tail = skb_peek_tail(&buffer->entries[index]);
714 else if (tail && (sn != buffer->last_amsdu ||
715 buffer->last_sub_index >= sub_frame_idx))
718 /* put in reorder buffer */
719 __skb_queue_tail(&buffer->entries[index], skb);
720 buffer->num_stored++;
721 buffer->reorder_time[index] = jiffies;
724 buffer->last_amsdu = sn;
725 buffer->last_sub_index = sub_frame_idx;
729 * We cannot trust NSSN for AMSDU sub-frames that are not the last.
730 * The reason is that NSSN advances on the first sub-frame, and may
731 * cause the reorder buffer to advance before all the sub-frames arrive.
732 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with
733 * SN 1. NSSN for first sub frame will be 3 with the result of driver
734 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is
735 * already ahead and it will be dropped.
736 * If the last sub-frame is not on this queue - we will get frame
737 * release notification with up to date NSSN.
739 if (!amsdu || last_subframe)
740 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn);
742 spin_unlock_bh(&buffer->lock);
747 spin_unlock_bh(&buffer->lock);
751 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm,
752 u32 reorder_data, u8 baid)
754 unsigned long now = jiffies;
755 unsigned long timeout;
756 struct iwl_mvm_baid_data *data;
760 data = rcu_dereference(mvm->baid_map[baid]);
763 "Got valid BAID but no baid allocated, bypass the re-ordering buffer. Baid %d reorder 0x%x\n",
771 timeout = data->timeout;
773 * Do not update last rx all the time to avoid cache bouncing
774 * between the rx queues.
775 * Update it every timeout. Worst case is the session will
776 * expire after ~ 2 * timeout, which doesn't matter that much.
778 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now))
779 /* Update is atomic */
786 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi,
787 struct iwl_rx_cmd_buffer *rxb, int queue)
789 struct ieee80211_rx_status *rx_status;
790 struct iwl_rx_packet *pkt = rxb_addr(rxb);
791 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data;
792 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc));
793 u32 len = le16_to_cpu(desc->mpdu_len);
794 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags);
795 u16 phy_info = le16_to_cpu(desc->phy_info);
796 struct ieee80211_sta *sta = NULL;
800 /* Dont use dev_alloc_skb(), we'll have enough headroom once
801 * ieee80211_hdr pulled.
803 skb = alloc_skb(128, GFP_ATOMIC);
805 IWL_ERR(mvm, "alloc_skb failed\n");
809 rx_status = IEEE80211_SKB_RXCB(skb);
811 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) {
817 * Keep packets with CRC errors (and with overrun) for monitor mode
818 * (otherwise the firmware discards them) but mark them as bad.
820 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) ||
821 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) {
822 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n",
823 le16_to_cpu(desc->status));
824 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
826 /* set the preamble flag if appropriate */
827 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE)
828 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
830 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) {
831 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise);
832 /* TSF as indicated by the firmware is at INA time */
833 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
835 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise);
836 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ :
838 rx_status->freq = ieee80211_channel_to_frequency(desc->channel,
840 iwl_mvm_get_signal_strength(mvm, desc, rx_status);
842 /* update aggregation data for monitor sake on default queue */
843 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) {
844 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE;
846 rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
847 rx_status->ampdu_reference = mvm->ampdu_ref;
848 /* toggle is switched whenever new aggregation starts */
849 if (toggle_bit != mvm->ampdu_toggle) {
851 mvm->ampdu_toggle = toggle_bit;
857 if (desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_SRC_STA_FOUND)) {
858 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK;
860 if (!WARN_ON_ONCE(id >= ARRAY_SIZE(mvm->fw_id_to_mac_id))) {
861 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
865 } else if (!is_multicast_ether_addr(hdr->addr2)) {
867 * This is fine since we prevent two stations with the same
868 * address from being added.
870 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
874 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
875 struct ieee80211_vif *tx_blocked_vif =
876 rcu_dereference(mvm->csa_tx_blocked_vif);
877 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) &
878 IWL_RX_MPDU_REORDER_BAID_MASK) >>
879 IWL_RX_MPDU_REORDER_BAID_SHIFT);
882 * We have tx blocked stations (with CS bit). If we heard
883 * frames from a blocked station on a new channel we can
886 if (unlikely(tx_blocked_vif) &&
887 tx_blocked_vif == mvmsta->vif) {
888 struct iwl_mvm_vif *mvmvif =
889 iwl_mvm_vif_from_mac80211(tx_blocked_vif);
891 if (mvmvif->csa_target_freq == rx_status->freq)
892 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
896 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
898 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
899 ieee80211_is_beacon(hdr->frame_control)) {
900 struct iwl_fw_dbg_trigger_tlv *trig;
901 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
905 trig = iwl_fw_dbg_get_trigger(mvm->fw,
906 FW_DBG_TRIGGER_RSSI);
907 rssi_trig = (void *)trig->data;
908 rssi = le32_to_cpu(rssi_trig->rssi);
911 iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
912 ieee80211_vif_to_wdev(mvmsta->vif),
914 if (trig_check && rx_status->signal < rssi)
915 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
919 if (ieee80211_is_data(hdr->frame_control))
920 iwl_mvm_rx_csum(sta, skb, desc);
922 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) {
928 * Our hardware de-aggregates AMSDUs but copies the mac header
929 * as it to the de-aggregated MPDUs. We need to turn off the
930 * AMSDU bit in the QoS control ourselves.
931 * In addition, HW reverses addr3 and addr4 - reverse it back.
933 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) &&
934 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) {
936 u8 *qc = ieee80211_get_qos_ctl(hdr);
937 u8 mac_addr[ETH_ALEN];
939 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
941 for (i = 0; i < ETH_ALEN; i++)
942 mac_addr[i] = hdr->addr3[ETH_ALEN - i - 1];
943 ether_addr_copy(hdr->addr3, mac_addr);
945 if (ieee80211_has_a4(hdr->frame_control)) {
946 for (i = 0; i < ETH_ALEN; i++)
948 hdr->addr4[ETH_ALEN - i - 1];
949 ether_addr_copy(hdr->addr4, mac_addr);
952 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) {
953 u32 reorder_data = le32_to_cpu(desc->reorder_data);
955 iwl_mvm_agg_rx_received(mvm, reorder_data, baid);
959 /* Set up the HT phy flags */
960 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
961 case RATE_MCS_CHAN_WIDTH_20:
963 case RATE_MCS_CHAN_WIDTH_40:
964 rx_status->bw = RATE_INFO_BW_40;
966 case RATE_MCS_CHAN_WIDTH_80:
967 rx_status->bw = RATE_INFO_BW_80;
969 case RATE_MCS_CHAN_WIDTH_160:
970 rx_status->bw = RATE_INFO_BW_160;
973 if (rate_n_flags & RATE_MCS_SGI_MSK)
974 rx_status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
975 if (rate_n_flags & RATE_HT_MCS_GF_MSK)
976 rx_status->enc_flags |= RX_ENC_FLAG_HT_GF;
977 if (rate_n_flags & RATE_MCS_LDPC_MSK)
978 rx_status->enc_flags |= RX_ENC_FLAG_LDPC;
979 if (rate_n_flags & RATE_MCS_HT_MSK) {
980 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
982 rx_status->encoding = RX_ENC_HT;
983 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
984 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
985 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
986 u8 stbc = (rate_n_flags & RATE_MCS_STBC_MSK) >>
989 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
990 RATE_VHT_MCS_NSS_POS) + 1;
991 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
992 rx_status->encoding = RX_ENC_VHT;
993 rx_status->enc_flags |= stbc << RX_ENC_FLAG_STBC_SHIFT;
994 if (rate_n_flags & RATE_MCS_BF_MSK)
995 rx_status->enc_flags |= RX_ENC_FLAG_BF;
997 int rate = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1000 if (WARN(rate < 0 || rate > 0xFF,
1001 "Invalid rate flags 0x%x, band %d,\n",
1002 rate_n_flags, rx_status->band)) {
1006 rx_status->rate_idx = rate;
1010 /* management stuff on default queue */
1012 if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
1013 ieee80211_is_probe_resp(hdr->frame_control)) &&
1014 mvm->sched_scan_pass_all ==
1015 SCHED_SCAN_PASS_ALL_ENABLED))
1016 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
1018 if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
1019 ieee80211_is_probe_resp(hdr->frame_control)))
1020 rx_status->boottime_ns = ktime_get_boot_ns();
1023 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb);
1024 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc))
1025 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta);
1030 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
1031 struct iwl_rx_cmd_buffer *rxb, int queue)
1033 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1034 struct iwl_frame_release *release = (void *)pkt->data;
1035 struct ieee80211_sta *sta;
1036 struct iwl_mvm_reorder_buffer *reorder_buf;
1037 struct iwl_mvm_baid_data *ba_data;
1039 int baid = release->baid;
1041 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n",
1042 release->baid, le16_to_cpu(release->nssn));
1044 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1049 ba_data = rcu_dereference(mvm->baid_map[baid]);
1050 if (WARN_ON_ONCE(!ba_data))
1053 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]);
1054 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta)))
1057 reorder_buf = &ba_data->reorder_buf[queue];
1059 spin_lock_bh(&reorder_buf->lock);
1060 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf,
1061 le16_to_cpu(release->nssn));
1062 spin_unlock_bh(&reorder_buf->lock);