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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * NXP Wireless LAN device driver: 802.11n RX Re-ordering
0004  *
0005  * Copyright 2011-2020 NXP
0006  */
0007 
0008 #include "decl.h"
0009 #include "ioctl.h"
0010 #include "util.h"
0011 #include "fw.h"
0012 #include "main.h"
0013 #include "wmm.h"
0014 #include "11n.h"
0015 #include "11n_rxreorder.h"
0016 
0017 /* This function will dispatch amsdu packet and forward it to kernel/upper
0018  * layer.
0019  */
0020 static int mwifiex_11n_dispatch_amsdu_pkt(struct mwifiex_private *priv,
0021                       struct sk_buff *skb)
0022 {
0023     struct rxpd *local_rx_pd = (struct rxpd *)(skb->data);
0024     int ret;
0025 
0026     if (le16_to_cpu(local_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
0027         struct sk_buff_head list;
0028         struct sk_buff *rx_skb;
0029 
0030         __skb_queue_head_init(&list);
0031 
0032         skb_pull(skb, le16_to_cpu(local_rx_pd->rx_pkt_offset));
0033         skb_trim(skb, le16_to_cpu(local_rx_pd->rx_pkt_length));
0034 
0035         ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
0036                      priv->wdev.iftype, 0, NULL, NULL);
0037 
0038         while (!skb_queue_empty(&list)) {
0039             struct rx_packet_hdr *rx_hdr;
0040 
0041             rx_skb = __skb_dequeue(&list);
0042             rx_hdr = (struct rx_packet_hdr *)rx_skb->data;
0043             if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
0044                 ntohs(rx_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
0045                 mwifiex_process_tdls_action_frame(priv,
0046                                   (u8 *)rx_hdr,
0047                                   skb->len);
0048             }
0049 
0050             if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
0051                 ret = mwifiex_uap_recv_packet(priv, rx_skb);
0052             else
0053                 ret = mwifiex_recv_packet(priv, rx_skb);
0054             if (ret == -1)
0055                 mwifiex_dbg(priv->adapter, ERROR,
0056                         "Rx of A-MSDU failed");
0057         }
0058         return 0;
0059     }
0060 
0061     return -1;
0062 }
0063 
0064 /* This function will process the rx packet and forward it to kernel/upper
0065  * layer.
0066  */
0067 static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv,
0068                     struct sk_buff *payload)
0069 {
0070 
0071     int ret;
0072 
0073     if (!payload) {
0074         mwifiex_dbg(priv->adapter, INFO, "info: fw drop data\n");
0075         return 0;
0076     }
0077 
0078     ret = mwifiex_11n_dispatch_amsdu_pkt(priv, payload);
0079     if (!ret)
0080         return 0;
0081 
0082     if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
0083         return mwifiex_handle_uap_rx_forward(priv, payload);
0084 
0085     return mwifiex_process_rx_packet(priv, payload);
0086 }
0087 
0088 /*
0089  * This function dispatches all packets in the Rx reorder table until the
0090  * start window.
0091  *
0092  * There could be holes in the buffer, which are skipped by the function.
0093  * Since the buffer is linear, the function uses rotation to simulate
0094  * circular buffer.
0095  */
0096 static void
0097 mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
0098                      struct mwifiex_rx_reorder_tbl *tbl,
0099                      int start_win)
0100 {
0101     struct sk_buff_head list;
0102     struct sk_buff *skb;
0103     int pkt_to_send, i;
0104 
0105     __skb_queue_head_init(&list);
0106     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0107 
0108     pkt_to_send = (start_win > tbl->start_win) ?
0109               min((start_win - tbl->start_win), tbl->win_size) :
0110               tbl->win_size;
0111 
0112     for (i = 0; i < pkt_to_send; ++i) {
0113         if (tbl->rx_reorder_ptr[i]) {
0114             skb = tbl->rx_reorder_ptr[i];
0115             __skb_queue_tail(&list, skb);
0116             tbl->rx_reorder_ptr[i] = NULL;
0117         }
0118     }
0119 
0120     /*
0121      * We don't have a circular buffer, hence use rotation to simulate
0122      * circular buffer
0123      */
0124     for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
0125         tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
0126         tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
0127     }
0128 
0129     tbl->start_win = start_win;
0130     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0131 
0132     while ((skb = __skb_dequeue(&list)))
0133         mwifiex_11n_dispatch_pkt(priv, skb);
0134 }
0135 
0136 /*
0137  * This function dispatches all packets in the Rx reorder table until
0138  * a hole is found.
0139  *
0140  * The start window is adjusted automatically when a hole is located.
0141  * Since the buffer is linear, the function uses rotation to simulate
0142  * circular buffer.
0143  */
0144 static void
0145 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
0146                   struct mwifiex_rx_reorder_tbl *tbl)
0147 {
0148     struct sk_buff_head list;
0149     struct sk_buff *skb;
0150     int i, j, xchg;
0151 
0152     __skb_queue_head_init(&list);
0153     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0154 
0155     for (i = 0; i < tbl->win_size; ++i) {
0156         if (!tbl->rx_reorder_ptr[i])
0157             break;
0158         skb = tbl->rx_reorder_ptr[i];
0159         __skb_queue_tail(&list, skb);
0160         tbl->rx_reorder_ptr[i] = NULL;
0161     }
0162 
0163     /*
0164      * We don't have a circular buffer, hence use rotation to simulate
0165      * circular buffer
0166      */
0167     if (i > 0) {
0168         xchg = tbl->win_size - i;
0169         for (j = 0; j < xchg; ++j) {
0170             tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
0171             tbl->rx_reorder_ptr[i + j] = NULL;
0172         }
0173     }
0174     tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
0175 
0176     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0177 
0178     while ((skb = __skb_dequeue(&list)))
0179         mwifiex_11n_dispatch_pkt(priv, skb);
0180 }
0181 
0182 /*
0183  * This function deletes the Rx reorder table and frees the memory.
0184  *
0185  * The function stops the associated timer and dispatches all the
0186  * pending packets in the Rx reorder table before deletion.
0187  */
0188 static void
0189 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
0190                  struct mwifiex_rx_reorder_tbl *tbl)
0191 {
0192     int start_win;
0193 
0194     if (!tbl)
0195         return;
0196 
0197     spin_lock_bh(&priv->adapter->rx_proc_lock);
0198     priv->adapter->rx_locked = true;
0199     if (priv->adapter->rx_processing) {
0200         spin_unlock_bh(&priv->adapter->rx_proc_lock);
0201         flush_workqueue(priv->adapter->rx_workqueue);
0202     } else {
0203         spin_unlock_bh(&priv->adapter->rx_proc_lock);
0204     }
0205 
0206     start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
0207     mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
0208 
0209     del_timer_sync(&tbl->timer_context.timer);
0210     tbl->timer_context.timer_is_set = false;
0211 
0212     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0213     list_del(&tbl->list);
0214     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0215 
0216     kfree(tbl->rx_reorder_ptr);
0217     kfree(tbl);
0218 
0219     spin_lock_bh(&priv->adapter->rx_proc_lock);
0220     priv->adapter->rx_locked = false;
0221     spin_unlock_bh(&priv->adapter->rx_proc_lock);
0222 
0223 }
0224 
0225 /*
0226  * This function returns the pointer to an entry in Rx reordering
0227  * table which matches the given TA/TID pair.
0228  */
0229 struct mwifiex_rx_reorder_tbl *
0230 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
0231 {
0232     struct mwifiex_rx_reorder_tbl *tbl;
0233 
0234     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0235     list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
0236         if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
0237             spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0238             return tbl;
0239         }
0240     }
0241     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0242 
0243     return NULL;
0244 }
0245 
0246 /* This function retrieves the pointer to an entry in Rx reordering
0247  * table which matches the given TA and deletes it.
0248  */
0249 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
0250 {
0251     struct mwifiex_rx_reorder_tbl *tbl, *tmp;
0252 
0253     if (!ta)
0254         return;
0255 
0256     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0257     list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
0258         if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
0259             spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0260             mwifiex_del_rx_reorder_entry(priv, tbl);
0261             spin_lock_bh(&priv->rx_reorder_tbl_lock);
0262         }
0263     }
0264     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0265 
0266     return;
0267 }
0268 
0269 /*
0270  * This function finds the last sequence number used in the packets
0271  * buffered in Rx reordering table.
0272  */
0273 static int
0274 mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
0275 {
0276     struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
0277     struct mwifiex_private *priv = ctx->priv;
0278     int i;
0279 
0280     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0281     for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
0282         if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
0283             spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0284             return i;
0285         }
0286     }
0287     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0288 
0289     return -1;
0290 }
0291 
0292 /*
0293  * This function flushes all the packets in Rx reordering table.
0294  *
0295  * The function checks if any packets are currently buffered in the
0296  * table or not. In case there are packets available, it dispatches
0297  * them and then dumps the Rx reordering table.
0298  */
0299 static void
0300 mwifiex_flush_data(struct timer_list *t)
0301 {
0302     struct reorder_tmr_cnxt *ctx =
0303         from_timer(ctx, t, timer);
0304     int start_win, seq_num;
0305 
0306     ctx->timer_is_set = false;
0307     seq_num = mwifiex_11n_find_last_seq_num(ctx);
0308 
0309     if (seq_num < 0)
0310         return;
0311 
0312     mwifiex_dbg(ctx->priv->adapter, INFO, "info: flush data %d\n", seq_num);
0313     start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
0314     mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
0315                          start_win);
0316 }
0317 
0318 /*
0319  * This function creates an entry in Rx reordering table for the
0320  * given TA/TID.
0321  *
0322  * The function also initializes the entry with sequence number, window
0323  * size as well as initializes the timer.
0324  *
0325  * If the received TA/TID pair is already present, all the packets are
0326  * dispatched and the window size is moved until the SSN.
0327  */
0328 static void
0329 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
0330                   int tid, int win_size, int seq_num)
0331 {
0332     int i;
0333     struct mwifiex_rx_reorder_tbl *tbl, *new_node;
0334     u16 last_seq = 0;
0335     struct mwifiex_sta_node *node;
0336 
0337     /*
0338      * If we get a TID, ta pair which is already present dispatch all the
0339      * the packets and move the window size until the ssn
0340      */
0341     tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
0342     if (tbl) {
0343         mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
0344         return;
0345     }
0346     /* if !tbl then create one */
0347     new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
0348     if (!new_node)
0349         return;
0350 
0351     INIT_LIST_HEAD(&new_node->list);
0352     new_node->tid = tid;
0353     memcpy(new_node->ta, ta, ETH_ALEN);
0354     new_node->start_win = seq_num;
0355     new_node->init_win = seq_num;
0356     new_node->flags = 0;
0357 
0358     spin_lock_bh(&priv->sta_list_spinlock);
0359     if (mwifiex_queuing_ra_based(priv)) {
0360         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
0361             node = mwifiex_get_sta_entry(priv, ta);
0362             if (node)
0363                 last_seq = node->rx_seq[tid];
0364         }
0365     } else {
0366         node = mwifiex_get_sta_entry(priv, ta);
0367         if (node)
0368             last_seq = node->rx_seq[tid];
0369         else
0370             last_seq = priv->rx_seq[tid];
0371     }
0372     spin_unlock_bh(&priv->sta_list_spinlock);
0373 
0374     mwifiex_dbg(priv->adapter, INFO,
0375             "info: last_seq=%d start_win=%d\n",
0376             last_seq, new_node->start_win);
0377 
0378     if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
0379         last_seq >= new_node->start_win) {
0380         new_node->start_win = last_seq + 1;
0381         new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
0382     }
0383 
0384     new_node->win_size = win_size;
0385 
0386     new_node->rx_reorder_ptr = kcalloc(win_size, sizeof(void *),
0387                        GFP_KERNEL);
0388     if (!new_node->rx_reorder_ptr) {
0389         kfree(new_node);
0390         mwifiex_dbg(priv->adapter, ERROR,
0391                 "%s: failed to alloc reorder_ptr\n", __func__);
0392         return;
0393     }
0394 
0395     new_node->timer_context.ptr = new_node;
0396     new_node->timer_context.priv = priv;
0397     new_node->timer_context.timer_is_set = false;
0398 
0399     timer_setup(&new_node->timer_context.timer, mwifiex_flush_data, 0);
0400 
0401     for (i = 0; i < win_size; ++i)
0402         new_node->rx_reorder_ptr[i] = NULL;
0403 
0404     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0405     list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
0406     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0407 }
0408 
0409 static void
0410 mwifiex_11n_rxreorder_timer_restart(struct mwifiex_rx_reorder_tbl *tbl)
0411 {
0412     u32 min_flush_time;
0413 
0414     if (tbl->win_size >= MWIFIEX_BA_WIN_SIZE_32)
0415         min_flush_time = MIN_FLUSH_TIMER_15_MS;
0416     else
0417         min_flush_time = MIN_FLUSH_TIMER_MS;
0418 
0419     mod_timer(&tbl->timer_context.timer,
0420           jiffies + msecs_to_jiffies(min_flush_time * tbl->win_size));
0421 
0422     tbl->timer_context.timer_is_set = true;
0423 }
0424 
0425 /*
0426  * This function prepares command for adding a BA request.
0427  *
0428  * Preparation includes -
0429  *      - Setting command ID and proper size
0430  *      - Setting add BA request buffer
0431  *      - Ensuring correct endian-ness
0432  */
0433 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
0434 {
0435     struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
0436 
0437     cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
0438     cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
0439     memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
0440 
0441     return 0;
0442 }
0443 
0444 /*
0445  * This function prepares command for adding a BA response.
0446  *
0447  * Preparation includes -
0448  *      - Setting command ID and proper size
0449  *      - Setting add BA response buffer
0450  *      - Ensuring correct endian-ness
0451  */
0452 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
0453                   struct host_cmd_ds_command *cmd,
0454                   struct host_cmd_ds_11n_addba_req
0455                   *cmd_addba_req)
0456 {
0457     struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
0458     struct mwifiex_sta_node *sta_ptr;
0459     u32 rx_win_size = priv->add_ba_param.rx_win_size;
0460     u8 tid;
0461     int win_size;
0462     uint16_t block_ack_param_set;
0463 
0464     if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
0465         ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
0466         priv->adapter->is_hw_11ac_capable &&
0467         memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
0468         spin_lock_bh(&priv->sta_list_spinlock);
0469         sta_ptr = mwifiex_get_sta_entry(priv,
0470                         cmd_addba_req->peer_mac_addr);
0471         if (!sta_ptr) {
0472             spin_unlock_bh(&priv->sta_list_spinlock);
0473             mwifiex_dbg(priv->adapter, ERROR,
0474                     "BA setup with unknown TDLS peer %pM!\n",
0475                     cmd_addba_req->peer_mac_addr);
0476             return -1;
0477         }
0478         if (sta_ptr->is_11ac_enabled)
0479             rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
0480         spin_unlock_bh(&priv->sta_list_spinlock);
0481     }
0482 
0483     cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
0484     cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
0485 
0486     memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
0487            ETH_ALEN);
0488     add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
0489     add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
0490     add_ba_rsp->ssn = cmd_addba_req->ssn;
0491 
0492     block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
0493     tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
0494         >> BLOCKACKPARAM_TID_POS;
0495     add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
0496     block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
0497 
0498     /* If we don't support AMSDU inside AMPDU, reset the bit */
0499     if (!priv->add_ba_param.rx_amsdu ||
0500         (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
0501         block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
0502     block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
0503     add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
0504     win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
0505                     & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
0506                     >> BLOCKACKPARAM_WINSIZE_POS;
0507     cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
0508 
0509     mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
0510                       tid, win_size,
0511                       le16_to_cpu(cmd_addba_req->ssn));
0512     return 0;
0513 }
0514 
0515 /*
0516  * This function prepares command for deleting a BA request.
0517  *
0518  * Preparation includes -
0519  *      - Setting command ID and proper size
0520  *      - Setting del BA request buffer
0521  *      - Ensuring correct endian-ness
0522  */
0523 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
0524 {
0525     struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
0526 
0527     cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
0528     cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
0529     memcpy(del_ba, data_buf, sizeof(*del_ba));
0530 
0531     return 0;
0532 }
0533 
0534 /*
0535  * This function identifies if Rx reordering is needed for a received packet.
0536  *
0537  * In case reordering is required, the function will do the reordering
0538  * before sending it to kernel.
0539  *
0540  * The Rx reorder table is checked first with the received TID/TA pair. If
0541  * not found, the received packet is dispatched immediately. But if found,
0542  * the packet is reordered and all the packets in the updated Rx reordering
0543  * table is dispatched until a hole is found.
0544  *
0545  * For sequence number less than the starting window, the packet is dropped.
0546  */
0547 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
0548                 u16 seq_num, u16 tid,
0549                 u8 *ta, u8 pkt_type, void *payload)
0550 {
0551     struct mwifiex_rx_reorder_tbl *tbl;
0552     int prev_start_win, start_win, end_win, win_size;
0553     u16 pkt_index;
0554     bool init_window_shift = false;
0555     int ret = 0;
0556 
0557     tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
0558     if (!tbl) {
0559         if (pkt_type != PKT_TYPE_BAR)
0560             mwifiex_11n_dispatch_pkt(priv, payload);
0561         return ret;
0562     }
0563 
0564     if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
0565         mwifiex_11n_dispatch_pkt(priv, payload);
0566         return ret;
0567     }
0568 
0569     start_win = tbl->start_win;
0570     prev_start_win = start_win;
0571     win_size = tbl->win_size;
0572     end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
0573     if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
0574         init_window_shift = true;
0575         tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
0576     }
0577 
0578     if (tbl->flags & RXREOR_FORCE_NO_DROP) {
0579         mwifiex_dbg(priv->adapter, INFO,
0580                 "RXREOR_FORCE_NO_DROP when HS is activated\n");
0581         tbl->flags &= ~RXREOR_FORCE_NO_DROP;
0582     } else if (init_window_shift && seq_num < start_win &&
0583            seq_num >= tbl->init_win) {
0584         mwifiex_dbg(priv->adapter, INFO,
0585                 "Sender TID sequence number reset %d->%d for SSN %d\n",
0586                 start_win, seq_num, tbl->init_win);
0587         tbl->start_win = start_win = seq_num;
0588         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
0589     } else {
0590         /*
0591          * If seq_num is less then starting win then ignore and drop
0592          * the packet
0593          */
0594         if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
0595             if (seq_num >= ((start_win + TWOPOW11) &
0596                     (MAX_TID_VALUE - 1)) &&
0597                 seq_num < start_win) {
0598                 ret = -1;
0599                 goto done;
0600             }
0601         } else if ((seq_num < start_win) ||
0602                (seq_num >= (start_win + TWOPOW11))) {
0603             ret = -1;
0604             goto done;
0605         }
0606     }
0607 
0608     /*
0609      * If this packet is a BAR we adjust seq_num as
0610      * WinStart = seq_num
0611      */
0612     if (pkt_type == PKT_TYPE_BAR)
0613         seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
0614 
0615     if (((end_win < start_win) &&
0616          (seq_num < start_win) && (seq_num > end_win)) ||
0617         ((end_win > start_win) && ((seq_num > end_win) ||
0618                        (seq_num < start_win)))) {
0619         end_win = seq_num;
0620         if (((end_win - win_size) + 1) >= 0)
0621             start_win = (end_win - win_size) + 1;
0622         else
0623             start_win = (MAX_TID_VALUE - (win_size - end_win)) + 1;
0624         mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
0625     }
0626 
0627     if (pkt_type != PKT_TYPE_BAR) {
0628         if (seq_num >= start_win)
0629             pkt_index = seq_num - start_win;
0630         else
0631             pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
0632 
0633         if (tbl->rx_reorder_ptr[pkt_index]) {
0634             ret = -1;
0635             goto done;
0636         }
0637 
0638         tbl->rx_reorder_ptr[pkt_index] = payload;
0639     }
0640 
0641     /*
0642      * Dispatch all packets sequentially from start_win until a
0643      * hole is found and adjust the start_win appropriately
0644      */
0645     mwifiex_11n_scan_and_dispatch(priv, tbl);
0646 
0647 done:
0648     if (!tbl->timer_context.timer_is_set ||
0649         prev_start_win != tbl->start_win)
0650         mwifiex_11n_rxreorder_timer_restart(tbl);
0651     return ret;
0652 }
0653 
0654 /*
0655  * This function deletes an entry for a given TID/TA pair.
0656  *
0657  * The TID/TA are taken from del BA event body.
0658  */
0659 void
0660 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
0661            u8 type, int initiator)
0662 {
0663     struct mwifiex_rx_reorder_tbl *tbl;
0664     struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
0665     struct mwifiex_ra_list_tbl *ra_list;
0666     u8 cleanup_rx_reorder_tbl;
0667     int tid_down;
0668 
0669     if (type == TYPE_DELBA_RECEIVE)
0670         cleanup_rx_reorder_tbl = (initiator) ? true : false;
0671     else
0672         cleanup_rx_reorder_tbl = (initiator) ? false : true;
0673 
0674     mwifiex_dbg(priv->adapter, EVENT, "event: DELBA: %pM tid=%d initiator=%d\n",
0675             peer_mac, tid, initiator);
0676 
0677     if (cleanup_rx_reorder_tbl) {
0678         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
0679                                  peer_mac);
0680         if (!tbl) {
0681             mwifiex_dbg(priv->adapter, EVENT,
0682                     "event: TID, TA not found in table\n");
0683             return;
0684         }
0685         mwifiex_del_rx_reorder_entry(priv, tbl);
0686     } else {
0687         ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
0688         if (!ptx_tbl) {
0689             mwifiex_dbg(priv->adapter, EVENT,
0690                     "event: TID, RA not found in table\n");
0691             return;
0692         }
0693 
0694         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
0695         ra_list = mwifiex_wmm_get_ralist_node(priv, tid_down, peer_mac);
0696         if (ra_list) {
0697             ra_list->amsdu_in_ampdu = false;
0698             ra_list->ba_status = BA_SETUP_NONE;
0699         }
0700         spin_lock_bh(&priv->tx_ba_stream_tbl_lock);
0701         mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
0702         spin_unlock_bh(&priv->tx_ba_stream_tbl_lock);
0703     }
0704 }
0705 
0706 /*
0707  * This function handles the command response of an add BA response.
0708  *
0709  * Handling includes changing the header fields into CPU format and
0710  * creating the stream, provided the add BA is accepted.
0711  */
0712 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
0713                    struct host_cmd_ds_command *resp)
0714 {
0715     struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
0716     int tid, win_size;
0717     struct mwifiex_rx_reorder_tbl *tbl;
0718     uint16_t block_ack_param_set;
0719 
0720     block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
0721 
0722     tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
0723         >> BLOCKACKPARAM_TID_POS;
0724     /*
0725      * Check if we had rejected the ADDBA, if yes then do not create
0726      * the stream
0727      */
0728     if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
0729         mwifiex_dbg(priv->adapter, ERROR, "ADDBA RSP: failed %pM tid=%d)\n",
0730                 add_ba_rsp->peer_mac_addr, tid);
0731 
0732         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
0733                              add_ba_rsp->peer_mac_addr);
0734         if (tbl)
0735             mwifiex_del_rx_reorder_entry(priv, tbl);
0736 
0737         return 0;
0738     }
0739 
0740     win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
0741             >> BLOCKACKPARAM_WINSIZE_POS;
0742 
0743     tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
0744                          add_ba_rsp->peer_mac_addr);
0745     if (tbl) {
0746         if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
0747             priv->add_ba_param.rx_amsdu &&
0748             (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
0749             tbl->amsdu = true;
0750         else
0751             tbl->amsdu = false;
0752     }
0753 
0754     mwifiex_dbg(priv->adapter, CMD,
0755             "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
0756         add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);
0757 
0758     return 0;
0759 }
0760 
0761 /*
0762  * This function handles BA stream timeout event by preparing and sending
0763  * a command to the firmware.
0764  */
0765 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
0766                    struct host_cmd_ds_11n_batimeout *event)
0767 {
0768     struct host_cmd_ds_11n_delba delba;
0769 
0770     memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
0771     memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
0772 
0773     delba.del_ba_param_set |=
0774         cpu_to_le16((u16) event->tid << DELBA_TID_POS);
0775     delba.del_ba_param_set |= cpu_to_le16(
0776         (u16) event->origninator << DELBA_INITIATOR_POS);
0777     delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
0778     mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
0779 }
0780 
0781 /*
0782  * This function cleans up the Rx reorder table by deleting all the entries
0783  * and re-initializing.
0784  */
0785 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
0786 {
0787     struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
0788 
0789     spin_lock_bh(&priv->rx_reorder_tbl_lock);
0790     list_for_each_entry_safe(del_tbl_ptr, tmp_node,
0791                  &priv->rx_reorder_tbl_ptr, list) {
0792         spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0793         mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
0794         spin_lock_bh(&priv->rx_reorder_tbl_lock);
0795     }
0796     INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
0797     spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0798 
0799     mwifiex_reset_11n_rx_seq_num(priv);
0800 }
0801 
0802 /*
0803  * This function updates all rx_reorder_tbl's flags.
0804  */
0805 void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
0806 {
0807     struct mwifiex_private *priv;
0808     struct mwifiex_rx_reorder_tbl *tbl;
0809     int i;
0810 
0811     for (i = 0; i < adapter->priv_num; i++) {
0812         priv = adapter->priv[i];
0813         if (!priv)
0814             continue;
0815 
0816         spin_lock_bh(&priv->rx_reorder_tbl_lock);
0817         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
0818             tbl->flags = flags;
0819         spin_unlock_bh(&priv->rx_reorder_tbl_lock);
0820     }
0821 
0822     return;
0823 }
0824 
0825 /* This function update all the rx_win_size based on coex flag
0826  */
0827 static void mwifiex_update_ampdu_rxwinsize(struct mwifiex_adapter *adapter,
0828                        bool coex_flag)
0829 {
0830     u8 i;
0831     u32 rx_win_size;
0832     struct mwifiex_private *priv;
0833 
0834     dev_dbg(adapter->dev, "Update rxwinsize %d\n", coex_flag);
0835 
0836     for (i = 0; i < adapter->priv_num; i++) {
0837         if (!adapter->priv[i])
0838             continue;
0839         priv = adapter->priv[i];
0840         rx_win_size = priv->add_ba_param.rx_win_size;
0841         if (coex_flag) {
0842             if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
0843                 priv->add_ba_param.rx_win_size =
0844                     MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
0845             if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
0846                 priv->add_ba_param.rx_win_size =
0847                     MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
0848             if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
0849                 priv->add_ba_param.rx_win_size =
0850                     MWIFIEX_UAP_COEX_AMPDU_DEF_RXWINSIZE;
0851         } else {
0852             if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
0853                 priv->add_ba_param.rx_win_size =
0854                     MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
0855             if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
0856                 priv->add_ba_param.rx_win_size =
0857                     MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
0858             if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
0859                 priv->add_ba_param.rx_win_size =
0860                     MWIFIEX_UAP_AMPDU_DEF_RXWINSIZE;
0861         }
0862 
0863         if (adapter->coex_win_size && adapter->coex_rx_win_size)
0864             priv->add_ba_param.rx_win_size =
0865                     adapter->coex_rx_win_size;
0866 
0867         if (rx_win_size != priv->add_ba_param.rx_win_size) {
0868             if (!priv->media_connected)
0869                 continue;
0870             for (i = 0; i < MAX_NUM_TID; i++)
0871                 mwifiex_11n_delba(priv, i);
0872         }
0873     }
0874 }
0875 
0876 /* This function check coex for RX BA
0877  */
0878 void mwifiex_coex_ampdu_rxwinsize(struct mwifiex_adapter *adapter)
0879 {
0880     u8 i;
0881     struct mwifiex_private *priv;
0882     u8 count = 0;
0883 
0884     for (i = 0; i < adapter->priv_num; i++) {
0885         if (adapter->priv[i]) {
0886             priv = adapter->priv[i];
0887             if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
0888                 if (priv->media_connected)
0889                     count++;
0890             }
0891             if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
0892                 if (priv->bss_started)
0893                     count++;
0894             }
0895         }
0896         if (count >= MWIFIEX_BSS_COEX_COUNT)
0897             break;
0898     }
0899     if (count >= MWIFIEX_BSS_COEX_COUNT)
0900         mwifiex_update_ampdu_rxwinsize(adapter, true);
0901     else
0902         mwifiex_update_ampdu_rxwinsize(adapter, false);
0903 }
0904 
0905 /* This function handles rxba_sync event
0906  */
0907 void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv,
0908                  u8 *event_buf, u16 len)
0909 {
0910     struct mwifiex_ie_types_rxba_sync *tlv_rxba = (void *)event_buf;
0911     u16 tlv_type, tlv_len;
0912     struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
0913     u8 i, j;
0914     u16 seq_num, tlv_seq_num, tlv_bitmap_len;
0915     int tlv_buf_left = len;
0916     int ret;
0917     u8 *tmp;
0918 
0919     mwifiex_dbg_dump(priv->adapter, EVT_D, "RXBA_SYNC event:",
0920              event_buf, len);
0921     while (tlv_buf_left >= sizeof(*tlv_rxba)) {
0922         tlv_type = le16_to_cpu(tlv_rxba->header.type);
0923         tlv_len  = le16_to_cpu(tlv_rxba->header.len);
0924         if (tlv_type != TLV_TYPE_RXBA_SYNC) {
0925             mwifiex_dbg(priv->adapter, ERROR,
0926                     "Wrong TLV id=0x%x\n", tlv_type);
0927             return;
0928         }
0929 
0930         tlv_seq_num = le16_to_cpu(tlv_rxba->seq_num);
0931         tlv_bitmap_len = le16_to_cpu(tlv_rxba->bitmap_len);
0932         mwifiex_dbg(priv->adapter, INFO,
0933                 "%pM tid=%d seq_num=%d bitmap_len=%d\n",
0934                 tlv_rxba->mac, tlv_rxba->tid, tlv_seq_num,
0935                 tlv_bitmap_len);
0936 
0937         rx_reor_tbl_ptr =
0938             mwifiex_11n_get_rx_reorder_tbl(priv, tlv_rxba->tid,
0939                                tlv_rxba->mac);
0940         if (!rx_reor_tbl_ptr) {
0941             mwifiex_dbg(priv->adapter, ERROR,
0942                     "Can not find rx_reorder_tbl!");
0943             return;
0944         }
0945 
0946         for (i = 0; i < tlv_bitmap_len; i++) {
0947             for (j = 0 ; j < 8; j++) {
0948                 if (tlv_rxba->bitmap[i] & (1 << j)) {
0949                     seq_num = (MAX_TID_VALUE - 1) &
0950                         (tlv_seq_num + i * 8 + j);
0951 
0952                     mwifiex_dbg(priv->adapter, ERROR,
0953                             "drop packet,seq=%d\n",
0954                             seq_num);
0955 
0956                     ret = mwifiex_11n_rx_reorder_pkt
0957                     (priv, seq_num, tlv_rxba->tid,
0958                      tlv_rxba->mac, 0, NULL);
0959 
0960                     if (ret)
0961                         mwifiex_dbg(priv->adapter,
0962                                 ERROR,
0963                                 "Fail to drop packet");
0964                 }
0965             }
0966         }
0967 
0968         tlv_buf_left -= (sizeof(*tlv_rxba) + tlv_len);
0969         tmp = (u8 *)tlv_rxba + tlv_len + sizeof(*tlv_rxba);
0970         tlv_rxba = (struct mwifiex_ie_types_rxba_sync *)tmp;
0971     }
0972 }
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