cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include "iwl-trans.h"
#include "mvm.h"
#include "fw-api.h"
#include "fw-dbg.h"


static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, int queue, struct ieee80211_sta *sta) { struct iwl_mvm_sta *mvmsta; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); struct iwl_mvm_key_pn *ptk_pn; u8 tid, keyidx; u8 pn[IEEE80211_CCMP_PN_LEN]; u8 *extiv; /* do PN checking */ /* multicast and non-data only arrives on default queue */ if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) return 0; /* do not check PN for open AP */ if (!(stats->flag & RX_FLAG_DECRYPTED)) return 0; /* * avoid checking for default queue - we don't want to replicate * all the logic that's necessary for checking the PN on fragmented * frames, leave that to mac80211 */ if (queue == 0) return 0; /* if we are here - this for sure is either CCMP or GCMP */ if (IS_ERR_OR_NULL(sta)) { IWL_ERR(mvm, "expected hw-decrypted unicast frame for station\n"); return -1; } mvmsta = iwl_mvm_sta_from_mac80211(sta); extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); keyidx = extiv[3] >> 6; ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); if (!ptk_pn) return -1; if (ieee80211_is_data_qos(hdr->frame_control)) tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; else tid = 0; /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ if (tid >= IWL_MAX_TID_COUNT) return -1; /* load pn */ pn[0] = extiv[7]; pn[1] = extiv[6]; pn[2] = extiv[5]; pn[3] = extiv[4]; pn[4] = extiv[1]; pn[5] = extiv[0]; if (memcmp(pn, ptk_pn->q[queue].pn[tid], IEEE80211_CCMP_PN_LEN) <= 0) return -1; if (!(stats->flag & RX_FLAG_AMSDU_MORE)) memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); stats->flag |= RX_FLAG_PN_VALIDATED; return 0; }

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/* iwl_mvm_create_skb Adds the rxb to a new skb */
static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, u16 len, u8 crypt_len, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; unsigned int headlen, fraglen, pad_len = 0; unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) { pad_len = 2; /* * If the device inserted padding it means that (it thought) * the 802.11 header wasn't a multiple of 4 bytes long. In * this case, reserve two bytes at the start of the SKB to * align the payload properly in case we end up copying it. */ skb_reserve(skb, pad_len); } len -= pad_len; /* If frame is small enough to fit in skb->head, pull it completely. * If not, only pull ieee80211_hdr (including crypto if present, and * an additional 8 bytes for SNAP/ethertype, see below) so that * splice() or TCP coalesce are more efficient. * * Since, in addition, ieee80211_data_to_8023() always pull in at * least 8 bytes (possibly more for mesh) we can do the same here * to save the cost of doing it later. That still doesn't pull in * the actual IP header since the typical case has a SNAP header. * If the latter changes (there are efforts in the standards group * to do so) we should revisit this and ieee80211_data_to_8023(). */ headlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8; /* The firmware may align the packet to DWORD. * The padding is inserted after the IV. * After copying the header + IV skip the padding if * present before copying packet data. */ hdrlen += crypt_len; memcpy(skb_put(skb, hdrlen), hdr, hdrlen); memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, headlen - hdrlen); fraglen = len - headlen; if (fraglen) { int offset = (void *)hdr + headlen + pad_len - rxb_addr(rxb) + rxb_offset(rxb); skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, fraglen, rxb->truesize); } }

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/* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */
static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, struct napi_struct *napi, struct sk_buff *skb, int queue, struct ieee80211_sta *sta) { if (iwl_mvm_check_pn(mvm, skb, queue, sta)) kfree_skb(skb); else ieee80211_rx_napi(mvm->hw, sta, skb, napi); }

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static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, struct iwl_rx_mpdu_desc *desc, struct ieee80211_rx_status *rx_status) { int energy_a, energy_b, max_energy; energy_a = desc->energy_a; energy_a = energy_a ? -energy_a : S8_MIN; energy_b = desc->energy_b; energy_b = energy_b ? -energy_b : S8_MIN; max_energy = max(energy_a, energy_b); IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", energy_a, energy_b, max_energy); rx_status->signal = max_energy; rx_status->chains = 0; /* TODO: phy info */ rx_status->chain_signal[0] = energy_a; rx_status->chain_signal[1] = energy_b; rx_status->chain_signal[2] = S8_MIN; }

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static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, struct ieee80211_rx_status *stats, struct iwl_rx_mpdu_desc *desc, int queue, u8 *crypt_len) { u16 status = le16_to_cpu(desc->status); if (!ieee80211_has_protected(hdr->frame_control) || (status & IWL_RX_MPDU_STATUS_SEC_MASK) == IWL_RX_MPDU_STATUS_SEC_NONE) return 0; /* TODO: handle packets encrypted with unknown alg */ switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { case IWL_RX_MPDU_STATUS_SEC_CCM: case IWL_RX_MPDU_STATUS_SEC_GCM: BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); /* alg is CCM: check MIC only */ if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; *crypt_len = IEEE80211_CCMP_HDR_LEN; return 0; case IWL_RX_MPDU_STATUS_SEC_TKIP: /* Don't drop the frame and decrypt it in SW */ if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) return 0; *crypt_len = IEEE80211_TKIP_IV_LEN; /* fall through if TTAK OK */ case IWL_RX_MPDU_STATUS_SEC_WEP: if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == IWL_RX_MPDU_STATUS_SEC_WEP) *crypt_len = IEEE80211_WEP_IV_LEN; return 0; case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) return -1; stats->flag |= RX_FLAG_DECRYPTED; return 0; default: IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); } return 0; }

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static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, struct sk_buff *skb, struct iwl_rx_mpdu_desc *desc) { struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); u16 flags = le16_to_cpu(desc->l3l4_flags); u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> IWL_RX_L3_PROTO_POS); if (mvmvif->features & NETIF_F_RXCSUM && flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || l3_prot == IWL_RX_L3_TYPE_IPV6 || l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) skb->ip_summed = CHECKSUM_UNNECESSARY; }

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/* * returns true if a packet outside BA session is a duplicate and * should be dropped */
static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, struct ieee80211_rx_status *rx_status, struct ieee80211_hdr *hdr, struct iwl_rx_mpdu_desc *desc) { struct iwl_mvm_sta *mvm_sta; struct iwl_mvm_rxq_dup_data *dup_data; u8 baid, tid, sub_frame_idx; if (WARN_ON(IS_ERR_OR_NULL(sta))) return false; baid = (le32_to_cpu(desc->reorder_data) & IWL_RX_MPDU_REORDER_BAID_MASK) >> IWL_RX_MPDU_REORDER_BAID_SHIFT; if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) return false; mvm_sta = iwl_mvm_sta_from_mac80211(sta); dup_data = &mvm_sta->dup_data[queue]; /* * Drop duplicate 802.11 retransmissions * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") */ if (ieee80211_is_ctl(hdr->frame_control) || ieee80211_is_qos_nullfunc(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) { rx_status->flag |= RX_FLAG_DUP_VALIDATED; return false; } if (ieee80211_is_data_qos(hdr->frame_control)) /* frame has qos control */ tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; else tid = IWL_MAX_TID_COUNT; /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; if (unlikely(ieee80211_has_retry(hdr->frame_control) && dup_data->last_seq[tid] == hdr->seq_ctrl && dup_data->last_sub_frame[tid] >= sub_frame_idx)) return true; dup_data->last_seq[tid] = hdr->seq_ctrl; dup_data->last_sub_frame[tid] = sub_frame_idx; rx_status->flag |= RX_FLAG_DUP_VALIDATED; return false; }

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int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, const u8 *data, u32 count) { struct iwl_rxq_sync_cmd *cmd; u32 data_size = sizeof(*cmd) + count; int ret; /* should be DWORD aligned */ if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) return -EINVAL; cmd = kzalloc(data_size, GFP_KERNEL); if (!cmd) return -ENOMEM; cmd->rxq_mask = cpu_to_le32(rxq_mask); cmd->count = cpu_to_le32(count); cmd->flags = 0; memcpy(cmd->payload, data, count); ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(DATA_PATH_GROUP, TRIGGER_RX_QUEUES_NOTIF_CMD), 0, data_size, cmd); kfree(cmd); return ret; }

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/* * Returns true if sn2 - buffer_size < sn1 < sn2. * To be used only in order to compare reorder buffer head with NSSN. * We fully trust NSSN unless it is behind us due to reorder timeout. * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. */
static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) { return ieee80211_sn_less(sn1, sn2) && !ieee80211_sn_less(sn1, sn2 - buffer_size); }

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#define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10)
static void iwl_mvm_release_frames(struct iwl_mvm *mvm, struct ieee80211_sta *sta, struct napi_struct *napi, struct iwl_mvm_reorder_buffer *reorder_buf, u16 nssn) { u16 ssn = reorder_buf->head_sn; lockdep_assert_held(&reorder_buf->lock); /* ignore nssn smaller than head sn - this can happen due to timeout */ if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) goto set_timer; while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { int index = ssn % reorder_buf->buf_size; struct sk_buff_head *skb_list = &reorder_buf->entries[index]; struct sk_buff *skb; ssn = ieee80211_sn_inc(ssn); /* * Empty the list. Will have more than one frame for A-MSDU. * Empty list is valid as well since nssn indicates frames were * received. */ while ((skb = __skb_dequeue(skb_list))) { iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, reorder_buf->queue, sta); reorder_buf->num_stored--; } } reorder_buf->head_sn = nssn; set_timer: if (reorder_buf->num_stored && !reorder_buf->removed) { u16 index = reorder_buf->head_sn % reorder_buf->buf_size; while (skb_queue_empty(&reorder_buf->entries[index])) index = (index + 1) % reorder_buf->buf_size; /* modify timer to match next frame's expiration time */ mod_timer(&reorder_buf->reorder_timer, reorder_buf->reorder_time[index] + 1 + RX_REORDER_BUF_TIMEOUT_MQ); } else { del_timer(&reorder_buf->reorder_timer); } }

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void iwl_mvm_reorder_timer_expired(unsigned long data) { struct iwl_mvm_reorder_buffer *buf = (void *)data; int i; u16 sn = 0, index = 0; bool expired = false; spin_lock(&buf->lock); if (!buf->num_stored || buf->removed) { spin_unlock(&buf->lock); return; } for (i = 0; i < buf->buf_size ; i++) { index = (buf->head_sn + i) % buf->buf_size; if (skb_queue_empty(&buf->entries[index])) continue; if (!time_after(jiffies, buf->reorder_time[index] + RX_REORDER_BUF_TIMEOUT_MQ)) break; expired = true; sn = ieee80211_sn_add(buf->head_sn, i + 1); } if (expired) { struct ieee80211_sta *sta; rcu_read_lock(); sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); /* SN is set to the last expired frame + 1 */ IWL_DEBUG_HT(buf->mvm, "Releasing expired frames for sta %u, sn %d\n", buf->sta_id, sn); iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); rcu_read_unlock(); } else if (buf->num_stored) { /* * If no frame expired and there are stored frames, index is now * pointing to the first unexpired frame - modify timer * accordingly to this frame. */ mod_timer(&buf->reorder_timer, buf->reorder_time[index] + 1 + RX_REORDER_BUF_TIMEOUT_MQ); } spin_unlock(&buf->lock); }

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static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, struct iwl_mvm_delba_data *data) { struct iwl_mvm_baid_data *ba_data; struct ieee80211_sta *sta; struct iwl_mvm_reorder_buffer *reorder_buf; u8 baid = data->baid; if (WARN_ONCE(baid >= IWL_MAX_BAID, "invalid BAID: %x\n", baid)) return; rcu_read_lock(); ba_data = rcu_dereference(mvm->baid_map[baid]); if (WARN_ON_ONCE(!ba_data)) goto out; sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) goto out; reorder_buf = &ba_data->reorder_buf[queue]; /* release all frames that are in the reorder buffer to the stack */ spin_lock_bh(&reorder_buf->lock); iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, ieee80211_sn_add(reorder_buf->head_sn, reorder_buf->buf_size)); spin_unlock_bh(&reorder_buf->lock); del_timer_sync(&reorder_buf->reorder_timer); out: rcu_read_unlock(); }

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void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, int queue) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rxq_sync_notification *notif; struct iwl_mvm_internal_rxq_notif *internal_notif; notif = (void *)pkt->data; internal_notif = (void *)notif->payload; if (internal_notif->sync) { if (mvm->queue_sync_cookie != internal_notif->cookie) { WARN_ONCE(1, "Received expired RX queue sync message\n"); return; } if (!atomic_dec_return(&mvm->queue_sync_counter)) wake_up(&mvm->rx_sync_waitq); } switch (internal_notif->type) { case IWL_MVM_RXQ_EMPTY: break; case IWL_MVM_RXQ_NOTIF_DEL_BA: iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); break; default: WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); } }

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Total148100.00%3100.00%

/* * Returns true if the MPDU was buffered\dropped, false if it should be passed * to upper layer. */
static bool iwl_mvm_reorder(struct iwl_mvm *mvm, struct napi_struct *napi, int queue, struct ieee80211_sta *sta, struct sk_buff *skb, struct iwl_rx_mpdu_desc *desc) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct iwl_mvm_sta *mvm_sta; struct iwl_mvm_baid_data *baid_data; struct iwl_mvm_reorder_buffer *buffer; struct sk_buff *tail; u32 reorder = le32_to_cpu(desc->reorder_data); bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; bool last_subframe = desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; u8 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; int index; u16 nssn, sn; u8 baid; baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> IWL_RX_MPDU_REORDER_BAID_SHIFT; /* * This also covers the case of receiving a Block Ack Request * outside a BA session; we'll pass it to mac80211 and that * then sends a delBA action frame. */ if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) return false; /* no sta yet */ if (WARN_ON(IS_ERR_OR_NULL(sta))) return false; mvm_sta = iwl_mvm_sta_from_mac80211(sta); /* not a data packet or a bar */ if (!ieee80211_is_back_req(hdr->frame_control) && (!ieee80211_is_data_qos(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1))) return false; if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) return false; baid_data = rcu_dereference(mvm->baid_map[baid]); if (WARN(!baid_data, "Received baid %d, but no data exists for this BAID\n", baid)) return false; if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, tid)) return false; nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> IWL_RX_MPDU_REORDER_SN_SHIFT; buffer = &baid_data->reorder_buf[queue]; spin_lock_bh(&buffer->lock); if (ieee80211_is_back_req(hdr->frame_control)) { iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); goto drop; } /* * If there was a significant jump in the nssn - adjust. * If the SN is smaller than the NSSN it might need to first go into * the reorder buffer, in which case we just release up to it and the * rest of the function will take of storing it and releasing up to the * nssn */ if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, buffer->buf_size)) { u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); } /* drop any oudated packets */ if (ieee80211_sn_less(sn, buffer->head_sn)) goto drop; /* release immediately if allowed by nssn and no stored frames */ if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, buffer->buf_size) && (!amsdu || last_subframe)) buffer->head_sn = nssn; /* No need to update AMSDU last SN - we are moving the head */ spin_unlock_bh(&buffer->lock); return false; } index = sn % buffer->buf_size; /* * Check if we already stored this frame * As AMSDU is either received or not as whole, logic is simple: * If we have frames in that position in the buffer and the last frame * originated from AMSDU had a different SN then it is a retransmission. * If it is the same SN then if the subframe index is incrementing it * is the same AMSDU - otherwise it is a retransmission. */ tail = skb_peek_tail(&buffer->entries[index]); if (tail && !amsdu) goto drop; else if (tail && (sn != buffer->last_amsdu || buffer->last_sub_index >= sub_frame_idx)) goto drop; /* put in reorder buffer */ __skb_queue_tail(&buffer->entries[index], skb); buffer->num_stored++; buffer->reorder_time[index] = jiffies; if (amsdu) { buffer->last_amsdu = sn; buffer->last_sub_index = sub_frame_idx; } /* * We cannot trust NSSN for AMSDU sub-frames that are not the last. * The reason is that NSSN advances on the first sub-frame, and may * cause the reorder buffer to advance before all the sub-frames arrive. * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with * SN 1. NSSN for first sub frame will be 3 with the result of driver * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is * already ahead and it will be dropped. * If the last sub-frame is not on this queue - we will get frame * release notification with up to date NSSN. */ if (!amsdu || last_subframe) iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); spin_unlock_bh(&buffer->lock); return true; drop: kfree_skb(skb); spin_unlock_bh(&buffer->lock); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Sara Sharon60798.70%880.00%
Luciano Coelho71.14%110.00%
Johannes Berg10.16%110.00%
Total615100.00%10100.00%


static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid) { unsigned long now = jiffies; unsigned long timeout; struct iwl_mvm_baid_data *data; rcu_read_lock(); data = rcu_dereference(mvm->baid_map[baid]); if (WARN_ON(!data)) goto out; if (!data->timeout) goto out; timeout = data->timeout; /* * Do not update last rx all the time to avoid cache bouncing * between the rx queues. * Update it every timeout. Worst case is the session will * expire after ~ 2 * timeout, which doesn't matter that much. */ if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) /* Update is atomic */ data->last_rx = now; out: rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Sara Sharon100100.00%1100.00%
Total100100.00%1100.00%


void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_cmd_buffer *rxb, int queue) { struct ieee80211_rx_status *rx_status; struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); u32 len = le16_to_cpu(desc->mpdu_len); u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); u16 phy_info = le16_to_cpu(desc->phy_info); struct ieee80211_sta *sta = NULL; struct sk_buff *skb; u8 crypt_len = 0; /* Dont use dev_alloc_skb(), we'll have enough headroom once * ieee80211_hdr pulled. */ skb = alloc_skb(128, GFP_ATOMIC); if (!skb) { IWL_ERR(mvm, "alloc_skb failed\n"); return; } rx_status = IEEE80211_SKB_RXCB(skb); if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { kfree_skb(skb); return; } /* * Keep packets with CRC errors (and with overrun) for monitor mode * (otherwise the firmware discards them) but mark them as bad. */ if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", le16_to_cpu(desc->status)); rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; } /* set the preamble flag if appropriate */ if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) rx_status->flag |= RX_FLAG_SHORTPRE; if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); /* TSF as indicated by the firmware is at INA time */ rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; } rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : NL80211_BAND_2GHZ; rx_status->freq = ieee80211_channel_to_frequency(desc->channel, rx_status->band); iwl_mvm_get_signal_strength(mvm, desc, rx_status); /* update aggregation data for monitor sake on default queue */ if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; rx_status->flag |= RX_FLAG_AMPDU_DETAILS; rx_status->ampdu_reference = mvm->ampdu_ref; /* toggle is switched whenever new aggregation starts */ if (toggle_bit != mvm->ampdu_toggle) { mvm->ampdu_ref++; mvm->ampdu_toggle = toggle_bit; } } rcu_read_lock(); if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) { sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); if (IS_ERR(sta)) sta = NULL; } } else if (!is_multicast_ether_addr(hdr->addr2)) { /* * This is fine since we prevent two stations with the same * address from being added. */ sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); } if (sta) { struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); struct ieee80211_vif *tx_blocked_vif = rcu_dereference(mvm->csa_tx_blocked_vif); u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & IWL_RX_MPDU_REORDER_BAID_MASK) >> IWL_RX_MPDU_REORDER_BAID_SHIFT); /* * We have tx blocked stations (with CS bit). If we heard * frames from a blocked station on a new channel we can * TX to it again. */ if (unlikely(tx_blocked_vif) && tx_blocked_vif == mvmsta->vif) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(tx_blocked_vif); if (mvmvif->csa_target_freq == rx_status->freq) iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false); } rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && ieee80211_is_beacon(hdr->frame_control)) { struct iwl_fw_dbg_trigger_tlv *trig; struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; bool trig_check; s32 rssi; trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_RSSI); rssi_trig = (void *)trig->data; rssi = le32_to_cpu(rssi_trig->rssi); trig_check = iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, trig); if (trig_check && rx_status->signal < rssi) iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); } if (ieee80211_is_data(hdr->frame_control)) iwl_mvm_rx_csum(sta, skb, desc); if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { kfree_skb(skb); rcu_read_unlock(); return; } /* * Our hardware de-aggregates AMSDUs but copies the mac header * as it to the de-aggregated MPDUs. We need to turn off the * AMSDU bit in the QoS control ourselves. */ if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { u8 *qc = ieee80211_get_qos_ctl(hdr); *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; if (!(desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME)) rx_status->flag |= RX_FLAG_AMSDU_MORE; } if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) iwl_mvm_agg_rx_received(mvm, baid); } /* Set up the HT phy flags */ switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { case RATE_MCS_CHAN_WIDTH_20: break; case RATE_MCS_CHAN_WIDTH_40: rx_status->flag |= RX_FLAG_40MHZ; break; case RATE_MCS_CHAN_WIDTH_80: rx_status->vht_flag |= RX_VHT_FLAG_80MHZ; break; case RATE_MCS_CHAN_WIDTH_160: rx_status->vht_flag |= RX_VHT_FLAG_160MHZ; break; } if (rate_n_flags & RATE_MCS_SGI_MSK) rx_status->flag |= RX_FLAG_SHORT_GI; if (rate_n_flags & RATE_HT_MCS_GF_MSK) rx_status->flag |= RX_FLAG_HT_GF; if (rate_n_flags & RATE_MCS_LDPC_MSK) rx_status->flag |= RX_FLAG_LDPC; if (rate_n_flags & RATE_MCS_HT_MSK) { u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >> RATE_MCS_STBC_POS; rx_status->flag |= RX_FLAG_HT; rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; } else if (rate_n_flags & RATE_MCS_VHT_MSK) { u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >> RATE_MCS_STBC_POS; rx_status->vht_nss = ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> RATE_VHT_MCS_NSS_POS) + 1; rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; rx_status->flag |= RX_FLAG_VHT; rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; if (rate_n_flags & RATE_MCS_BF_MSK) rx_status->vht_flag |= RX_VHT_FLAG_BF; } else { rx_status->rate_idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, rx_status->band); } /* management stuff on default queue */ if (!queue) { if (unlikely((ieee80211_is_beacon(hdr->frame_control) || ieee80211_is_probe_resp(hdr->frame_control)) && mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED)) mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; if (unlikely(ieee80211_is_beacon(hdr->frame_control) || ieee80211_is_probe_resp(hdr->frame_control))) rx_status->boottime_ns = ktime_get_boot_ns(); } iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg75368.21%325.00%
Sara Sharon31128.17%866.67%
Andrei Otcheretianski403.62%18.33%
Total1104100.00%12100.00%


void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, struct iwl_rx_cmd_buffer *rxb, int queue) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_frame_release *release = (void *)pkt->data; struct ieee80211_sta *sta; struct iwl_mvm_reorder_buffer *reorder_buf; struct iwl_mvm_baid_data *ba_data; int baid = release->baid; IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", release->baid, le16_to_cpu(release->nssn)); if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) return; rcu_read_lock(); ba_data = rcu_dereference(mvm->baid_map[baid]); if (WARN_ON_ONCE(!ba_data)) goto out; sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) goto out; reorder_buf = &ba_data->reorder_buf[queue]; spin_lock_bh(&reorder_buf->lock); iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, le16_to_cpu(release->nssn)); spin_unlock_bh(&reorder_buf->lock); out: rcu_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Sara Sharon198100.00%3100.00%
Total198100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Sara Sharon256359.37%2468.57%
Johannes Berg170739.54%925.71%
Andrei Otcheretianski400.93%12.86%
Luciano Coelho70.16%12.86%
Total4317100.00%35100.00%
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