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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * NXP Wireless LAN device driver: WMM
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 
0016 
0017 /* Maximum value FW can accept for driver delay in packet transmission */
0018 #define DRV_PKT_DELAY_TO_FW_MAX   512
0019 
0020 
0021 #define WMM_QUEUED_PACKET_LOWER_LIMIT   180
0022 
0023 #define WMM_QUEUED_PACKET_UPPER_LIMIT   200
0024 
0025 /* Offset for TOS field in the IP header */
0026 #define IPTOS_OFFSET 5
0027 
0028 static bool disable_tx_amsdu;
0029 module_param(disable_tx_amsdu, bool, 0644);
0030 
0031 /* This table inverses the tos_to_tid operation to get a priority
0032  * which is in sequential order, and can be compared.
0033  * Use this to compare the priority of two different TIDs.
0034  */
0035 const u8 tos_to_tid_inv[] = {
0036     0x02,  /* from tos_to_tid[2] = 0 */
0037     0x00,  /* from tos_to_tid[0] = 1 */
0038     0x01,  /* from tos_to_tid[1] = 2 */
0039     0x03,
0040     0x04,
0041     0x05,
0042     0x06,
0043     0x07
0044 };
0045 
0046 /* WMM information IE */
0047 static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
0048     0x00, 0x50, 0xf2, 0x02,
0049     0x00, 0x01, 0x00
0050 };
0051 
0052 static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
0053     WMM_AC_BK,
0054     WMM_AC_VI,
0055     WMM_AC_VO
0056 };
0057 
0058 static u8 tos_to_tid[] = {
0059     /* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
0060     0x01,           /* 0 1 0 AC_BK */
0061     0x02,           /* 0 0 0 AC_BK */
0062     0x00,           /* 0 0 1 AC_BE */
0063     0x03,           /* 0 1 1 AC_BE */
0064     0x04,           /* 1 0 0 AC_VI */
0065     0x05,           /* 1 0 1 AC_VI */
0066     0x06,           /* 1 1 0 AC_VO */
0067     0x07            /* 1 1 1 AC_VO */
0068 };
0069 
0070 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
0071 
0072 /*
0073  * This function debug prints the priority parameters for a WMM AC.
0074  */
0075 static void
0076 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
0077 {
0078     const char *ac_str[] = { "BK", "BE", "VI", "VO" };
0079 
0080     pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
0081          "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
0082          ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
0083                          & MWIFIEX_ACI) >> 5]],
0084          (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
0085          (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
0086          ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
0087          ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
0088          (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
0089          le16_to_cpu(ac_param->tx_op_limit));
0090 }
0091 
0092 /*
0093  * This function allocates a route address list.
0094  *
0095  * The function also initializes the list with the provided RA.
0096  */
0097 static struct mwifiex_ra_list_tbl *
0098 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, const u8 *ra)
0099 {
0100     struct mwifiex_ra_list_tbl *ra_list;
0101 
0102     ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
0103     if (!ra_list)
0104         return NULL;
0105 
0106     INIT_LIST_HEAD(&ra_list->list);
0107     skb_queue_head_init(&ra_list->skb_head);
0108 
0109     memcpy(ra_list->ra, ra, ETH_ALEN);
0110 
0111     ra_list->total_pkt_count = 0;
0112 
0113     mwifiex_dbg(adapter, INFO, "info: allocated ra_list %p\n", ra_list);
0114 
0115     return ra_list;
0116 }
0117 
0118 /* This function returns random no between 16 and 32 to be used as threshold
0119  * for no of packets after which BA setup is initiated.
0120  */
0121 static u8 mwifiex_get_random_ba_threshold(void)
0122 {
0123     u64 ns;
0124     /* setup ba_packet_threshold here random number between
0125      * [BA_SETUP_PACKET_OFFSET,
0126      * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
0127      */
0128     ns = ktime_get_ns();
0129     ns += (ns >> 32) + (ns >> 16);
0130 
0131     return ((u8)ns % BA_SETUP_MAX_PACKET_THRESHOLD) + BA_SETUP_PACKET_OFFSET;
0132 }
0133 
0134 /*
0135  * This function allocates and adds a RA list for all TIDs
0136  * with the given RA.
0137  */
0138 void mwifiex_ralist_add(struct mwifiex_private *priv, const u8 *ra)
0139 {
0140     int i;
0141     struct mwifiex_ra_list_tbl *ra_list;
0142     struct mwifiex_adapter *adapter = priv->adapter;
0143     struct mwifiex_sta_node *node;
0144 
0145 
0146     for (i = 0; i < MAX_NUM_TID; ++i) {
0147         ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
0148         mwifiex_dbg(adapter, INFO,
0149                 "info: created ra_list %p\n", ra_list);
0150 
0151         if (!ra_list)
0152             break;
0153 
0154         ra_list->is_11n_enabled = 0;
0155         ra_list->tdls_link = false;
0156         ra_list->ba_status = BA_SETUP_NONE;
0157         ra_list->amsdu_in_ampdu = false;
0158         if (!mwifiex_queuing_ra_based(priv)) {
0159             if (mwifiex_is_tdls_link_setup
0160                 (mwifiex_get_tdls_link_status(priv, ra))) {
0161                 ra_list->tdls_link = true;
0162                 ra_list->is_11n_enabled =
0163                     mwifiex_tdls_peer_11n_enabled(priv, ra);
0164             } else {
0165                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
0166             }
0167         } else {
0168             spin_lock_bh(&priv->sta_list_spinlock);
0169             node = mwifiex_get_sta_entry(priv, ra);
0170             if (node)
0171                 ra_list->tx_paused = node->tx_pause;
0172             ra_list->is_11n_enabled =
0173                       mwifiex_is_sta_11n_enabled(priv, node);
0174             if (ra_list->is_11n_enabled)
0175                 ra_list->max_amsdu = node->max_amsdu;
0176             spin_unlock_bh(&priv->sta_list_spinlock);
0177         }
0178 
0179         mwifiex_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
0180                 ra_list, ra_list->is_11n_enabled);
0181 
0182         if (ra_list->is_11n_enabled) {
0183             ra_list->ba_pkt_count = 0;
0184             ra_list->ba_packet_thr =
0185                           mwifiex_get_random_ba_threshold();
0186         }
0187         list_add_tail(&ra_list->list,
0188                   &priv->wmm.tid_tbl_ptr[i].ra_list);
0189     }
0190 }
0191 
0192 /*
0193  * This function sets the WMM queue priorities to their default values.
0194  */
0195 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
0196 {
0197     /* Default queue priorities: VO->VI->BE->BK */
0198     priv->wmm.queue_priority[0] = WMM_AC_VO;
0199     priv->wmm.queue_priority[1] = WMM_AC_VI;
0200     priv->wmm.queue_priority[2] = WMM_AC_BE;
0201     priv->wmm.queue_priority[3] = WMM_AC_BK;
0202 }
0203 
0204 /*
0205  * This function map ACs to TIDs.
0206  */
0207 static void
0208 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
0209 {
0210     struct mwifiex_wmm_desc *wmm = &priv->wmm;
0211     u8 *queue_priority = wmm->queue_priority;
0212     int i;
0213 
0214     for (i = 0; i < 4; ++i) {
0215         tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
0216         tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
0217     }
0218 
0219     for (i = 0; i < MAX_NUM_TID; ++i)
0220         priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
0221 
0222     atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
0223 }
0224 
0225 /*
0226  * This function initializes WMM priority queues.
0227  */
0228 void
0229 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
0230                    struct ieee_types_wmm_parameter *wmm_ie)
0231 {
0232     u16 cw_min, avg_back_off, tmp[4];
0233     u32 i, j, num_ac;
0234     u8 ac_idx;
0235 
0236     if (!wmm_ie || !priv->wmm_enabled) {
0237         /* WMM is not enabled, just set the defaults and return */
0238         mwifiex_wmm_default_queue_priorities(priv);
0239         return;
0240     }
0241 
0242     mwifiex_dbg(priv->adapter, INFO,
0243             "info: WMM Parameter IE: version=%d,\t"
0244             "qos_info Parameter Set Count=%d, Reserved=%#x\n",
0245             wmm_ie->version, wmm_ie->qos_info_bitmap &
0246             IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
0247             wmm_ie->reserved);
0248 
0249     for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
0250         u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
0251         u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
0252         cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
0253         avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
0254 
0255         ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
0256         priv->wmm.queue_priority[ac_idx] = ac_idx;
0257         tmp[ac_idx] = avg_back_off;
0258 
0259         mwifiex_dbg(priv->adapter, INFO,
0260                 "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
0261                 (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
0262                 cw_min, avg_back_off);
0263         mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
0264     }
0265 
0266     /* Bubble sort */
0267     for (i = 0; i < num_ac; i++) {
0268         for (j = 1; j < num_ac - i; j++) {
0269             if (tmp[j - 1] > tmp[j]) {
0270                 swap(tmp[j - 1], tmp[j]);
0271                 swap(priv->wmm.queue_priority[j - 1],
0272                      priv->wmm.queue_priority[j]);
0273             } else if (tmp[j - 1] == tmp[j]) {
0274                 if (priv->wmm.queue_priority[j - 1]
0275                     < priv->wmm.queue_priority[j])
0276                     swap(priv->wmm.queue_priority[j - 1],
0277                          priv->wmm.queue_priority[j]);
0278             }
0279         }
0280     }
0281 
0282     mwifiex_wmm_queue_priorities_tid(priv);
0283 }
0284 
0285 /*
0286  * This function evaluates whether or not an AC is to be downgraded.
0287  *
0288  * In case the AC is not enabled, the highest AC is returned that is
0289  * enabled and does not require admission control.
0290  */
0291 static enum mwifiex_wmm_ac_e
0292 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
0293                   enum mwifiex_wmm_ac_e eval_ac)
0294 {
0295     int down_ac;
0296     enum mwifiex_wmm_ac_e ret_ac;
0297     struct mwifiex_wmm_ac_status *ac_status;
0298 
0299     ac_status = &priv->wmm.ac_status[eval_ac];
0300 
0301     if (!ac_status->disabled)
0302         /* Okay to use this AC, its enabled */
0303         return eval_ac;
0304 
0305     /* Setup a default return value of the lowest priority */
0306     ret_ac = WMM_AC_BK;
0307 
0308     /*
0309      *  Find the highest AC that is enabled and does not require
0310      *  admission control. The spec disallows downgrading to an AC,
0311      *  which is enabled due to a completed admission control.
0312      *  Unadmitted traffic is not to be sent on an AC with admitted
0313      *  traffic.
0314      */
0315     for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
0316         ac_status = &priv->wmm.ac_status[down_ac];
0317 
0318         if (!ac_status->disabled && !ac_status->flow_required)
0319             /* AC is enabled and does not require admission
0320                control */
0321             ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
0322     }
0323 
0324     return ret_ac;
0325 }
0326 
0327 /*
0328  * This function downgrades WMM priority queue.
0329  */
0330 void
0331 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
0332 {
0333     int ac_val;
0334 
0335     mwifiex_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
0336             "BK(0), BE(1), VI(2), VO(3)\n");
0337 
0338     if (!priv->wmm_enabled) {
0339         /* WMM is not enabled, default priorities */
0340         for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
0341             priv->wmm.ac_down_graded_vals[ac_val] =
0342                         (enum mwifiex_wmm_ac_e) ac_val;
0343     } else {
0344         for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
0345             priv->wmm.ac_down_graded_vals[ac_val]
0346                 = mwifiex_wmm_eval_downgrade_ac(priv,
0347                         (enum mwifiex_wmm_ac_e) ac_val);
0348             mwifiex_dbg(priv->adapter, INFO,
0349                     "info: WMM: AC PRIO %d maps to %d\n",
0350                     ac_val,
0351                     priv->wmm.ac_down_graded_vals[ac_val]);
0352         }
0353     }
0354 }
0355 
0356 /*
0357  * This function converts the IP TOS field to an WMM AC
0358  * Queue assignment.
0359  */
0360 static enum mwifiex_wmm_ac_e
0361 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
0362 {
0363     /* Map of TOS UP values to WMM AC */
0364     static const enum mwifiex_wmm_ac_e tos_to_ac[] = {
0365         WMM_AC_BE,
0366         WMM_AC_BK,
0367         WMM_AC_BK,
0368         WMM_AC_BE,
0369         WMM_AC_VI,
0370         WMM_AC_VI,
0371         WMM_AC_VO,
0372         WMM_AC_VO
0373     };
0374 
0375     if (tos >= ARRAY_SIZE(tos_to_ac))
0376         return WMM_AC_BE;
0377 
0378     return tos_to_ac[tos];
0379 }
0380 
0381 /*
0382  * This function evaluates a given TID and downgrades it to a lower
0383  * TID if the WMM Parameter IE received from the AP indicates that the
0384  * AP is disabled (due to call admission control (ACM bit). Mapping
0385  * of TID to AC is taken care of internally.
0386  */
0387 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
0388 {
0389     enum mwifiex_wmm_ac_e ac, ac_down;
0390     u8 new_tid;
0391 
0392     ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
0393     ac_down = priv->wmm.ac_down_graded_vals[ac];
0394 
0395     /* Send the index to tid array, picking from the array will be
0396      * taken care by dequeuing function
0397      */
0398     new_tid = ac_to_tid[ac_down][tid % 2];
0399 
0400     return new_tid;
0401 }
0402 
0403 /*
0404  * This function initializes the WMM state information and the
0405  * WMM data path queues.
0406  */
0407 void
0408 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
0409 {
0410     int i, j;
0411     struct mwifiex_private *priv;
0412 
0413     for (j = 0; j < adapter->priv_num; ++j) {
0414         priv = adapter->priv[j];
0415         if (!priv)
0416             continue;
0417 
0418         for (i = 0; i < MAX_NUM_TID; ++i) {
0419             if (!disable_tx_amsdu &&
0420                 adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
0421                 priv->aggr_prio_tbl[i].amsdu =
0422                             priv->tos_to_tid_inv[i];
0423             else
0424                 priv->aggr_prio_tbl[i].amsdu =
0425                             BA_STREAM_NOT_ALLOWED;
0426             priv->aggr_prio_tbl[i].ampdu_ap =
0427                             priv->tos_to_tid_inv[i];
0428             priv->aggr_prio_tbl[i].ampdu_user =
0429                             priv->tos_to_tid_inv[i];
0430         }
0431 
0432         priv->aggr_prio_tbl[6].amsdu
0433                     = priv->aggr_prio_tbl[6].ampdu_ap
0434                     = priv->aggr_prio_tbl[6].ampdu_user
0435                     = BA_STREAM_NOT_ALLOWED;
0436 
0437         priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
0438                     = priv->aggr_prio_tbl[7].ampdu_user
0439                     = BA_STREAM_NOT_ALLOWED;
0440 
0441         mwifiex_set_ba_params(priv);
0442         mwifiex_reset_11n_rx_seq_num(priv);
0443 
0444         priv->wmm.drv_pkt_delay_max = MWIFIEX_WMM_DRV_DELAY_MAX;
0445         atomic_set(&priv->wmm.tx_pkts_queued, 0);
0446         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
0447     }
0448 }
0449 
0450 int mwifiex_bypass_txlist_empty(struct mwifiex_adapter *adapter)
0451 {
0452     struct mwifiex_private *priv;
0453     int i;
0454 
0455     for (i = 0; i < adapter->priv_num; i++) {
0456         priv = adapter->priv[i];
0457         if (!priv)
0458             continue;
0459         if (adapter->if_ops.is_port_ready &&
0460             !adapter->if_ops.is_port_ready(priv))
0461             continue;
0462         if (!skb_queue_empty(&priv->bypass_txq))
0463             return false;
0464     }
0465 
0466     return true;
0467 }
0468 
0469 /*
0470  * This function checks if WMM Tx queue is empty.
0471  */
0472 int
0473 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
0474 {
0475     int i;
0476     struct mwifiex_private *priv;
0477 
0478     for (i = 0; i < adapter->priv_num; ++i) {
0479         priv = adapter->priv[i];
0480         if (!priv)
0481             continue;
0482         if (!priv->port_open &&
0483             (priv->bss_mode != NL80211_IFTYPE_ADHOC))
0484             continue;
0485         if (adapter->if_ops.is_port_ready &&
0486             !adapter->if_ops.is_port_ready(priv))
0487             continue;
0488         if (atomic_read(&priv->wmm.tx_pkts_queued))
0489             return false;
0490     }
0491 
0492     return true;
0493 }
0494 
0495 /*
0496  * This function deletes all packets in an RA list node.
0497  *
0498  * The packet sent completion callback handler are called with
0499  * status failure, after they are dequeued to ensure proper
0500  * cleanup. The RA list node itself is freed at the end.
0501  */
0502 static void
0503 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
0504                     struct mwifiex_ra_list_tbl *ra_list)
0505 {
0506     struct mwifiex_adapter *adapter = priv->adapter;
0507     struct sk_buff *skb, *tmp;
0508 
0509     skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
0510         skb_unlink(skb, &ra_list->skb_head);
0511         mwifiex_write_data_complete(adapter, skb, 0, -1);
0512     }
0513 }
0514 
0515 /*
0516  * This function deletes all packets in an RA list.
0517  *
0518  * Each nodes in the RA list are freed individually first, and then
0519  * the RA list itself is freed.
0520  */
0521 static void
0522 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
0523                    struct list_head *ra_list_head)
0524 {
0525     struct mwifiex_ra_list_tbl *ra_list;
0526 
0527     list_for_each_entry(ra_list, ra_list_head, list)
0528         mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
0529 }
0530 
0531 /*
0532  * This function deletes all packets in all RA lists.
0533  */
0534 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
0535 {
0536     int i;
0537 
0538     for (i = 0; i < MAX_NUM_TID; i++)
0539         mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
0540                                        ra_list);
0541 
0542     atomic_set(&priv->wmm.tx_pkts_queued, 0);
0543     atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
0544 }
0545 
0546 /*
0547  * This function deletes all route addresses from all RA lists.
0548  */
0549 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
0550 {
0551     struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
0552     int i;
0553 
0554     for (i = 0; i < MAX_NUM_TID; ++i) {
0555         mwifiex_dbg(priv->adapter, INFO,
0556                 "info: ra_list: freeing buf for tid %d\n", i);
0557         list_for_each_entry_safe(ra_list, tmp_node,
0558                      &priv->wmm.tid_tbl_ptr[i].ra_list,
0559                      list) {
0560             list_del(&ra_list->list);
0561             kfree(ra_list);
0562         }
0563 
0564         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
0565     }
0566 }
0567 
0568 static int mwifiex_free_ack_frame(int id, void *p, void *data)
0569 {
0570     pr_warn("Have pending ack frames!\n");
0571     kfree_skb(p);
0572     return 0;
0573 }
0574 
0575 /*
0576  * This function cleans up the Tx and Rx queues.
0577  *
0578  * Cleanup includes -
0579  *      - All packets in RA lists
0580  *      - All entries in Rx reorder table
0581  *      - All entries in Tx BA stream table
0582  *      - MPA buffer (if required)
0583  *      - All RA lists
0584  */
0585 void
0586 mwifiex_clean_txrx(struct mwifiex_private *priv)
0587 {
0588     struct sk_buff *skb, *tmp;
0589 
0590     mwifiex_11n_cleanup_reorder_tbl(priv);
0591     spin_lock_bh(&priv->wmm.ra_list_spinlock);
0592 
0593     mwifiex_wmm_cleanup_queues(priv);
0594     mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
0595 
0596     if (priv->adapter->if_ops.cleanup_mpa_buf)
0597         priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
0598 
0599     mwifiex_wmm_delete_all_ralist(priv);
0600     memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
0601 
0602     if (priv->adapter->if_ops.clean_pcie_ring &&
0603         !test_bit(MWIFIEX_SURPRISE_REMOVED, &priv->adapter->work_flags))
0604         priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
0605     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0606 
0607     skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
0608         skb_unlink(skb, &priv->tdls_txq);
0609         mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
0610     }
0611 
0612     skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
0613         skb_unlink(skb, &priv->bypass_txq);
0614         mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
0615     }
0616     atomic_set(&priv->adapter->bypass_tx_pending, 0);
0617 
0618     idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
0619     idr_destroy(&priv->ack_status_frames);
0620 }
0621 
0622 /*
0623  * This function retrieves a particular RA list node, matching with the
0624  * given TID and RA address.
0625  */
0626 struct mwifiex_ra_list_tbl *
0627 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
0628                 const u8 *ra_addr)
0629 {
0630     struct mwifiex_ra_list_tbl *ra_list;
0631 
0632     list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
0633                 list) {
0634         if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
0635             return ra_list;
0636     }
0637 
0638     return NULL;
0639 }
0640 
0641 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
0642                     u8 tx_pause)
0643 {
0644     struct mwifiex_ra_list_tbl *ra_list;
0645     u32 pkt_cnt = 0, tx_pkts_queued;
0646     int i;
0647 
0648     spin_lock_bh(&priv->wmm.ra_list_spinlock);
0649 
0650     for (i = 0; i < MAX_NUM_TID; ++i) {
0651         ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
0652         if (ra_list && ra_list->tx_paused != tx_pause) {
0653             pkt_cnt += ra_list->total_pkt_count;
0654             ra_list->tx_paused = tx_pause;
0655             if (tx_pause)
0656                 priv->wmm.pkts_paused[i] +=
0657                     ra_list->total_pkt_count;
0658             else
0659                 priv->wmm.pkts_paused[i] -=
0660                     ra_list->total_pkt_count;
0661         }
0662     }
0663 
0664     if (pkt_cnt) {
0665         tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
0666         if (tx_pause)
0667             tx_pkts_queued -= pkt_cnt;
0668         else
0669             tx_pkts_queued += pkt_cnt;
0670 
0671         atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
0672         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
0673     }
0674     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0675 }
0676 
0677 /* This function updates non-tdls peer ralist tx_pause while
0678  * tdls channel switching
0679  */
0680 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
0681                            u8 *mac, u8 tx_pause)
0682 {
0683     struct mwifiex_ra_list_tbl *ra_list;
0684     u32 pkt_cnt = 0, tx_pkts_queued;
0685     int i;
0686 
0687     spin_lock_bh(&priv->wmm.ra_list_spinlock);
0688 
0689     for (i = 0; i < MAX_NUM_TID; ++i) {
0690         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
0691                     list) {
0692             if (!memcmp(ra_list->ra, mac, ETH_ALEN))
0693                 continue;
0694 
0695             if (ra_list->tx_paused != tx_pause) {
0696                 pkt_cnt += ra_list->total_pkt_count;
0697                 ra_list->tx_paused = tx_pause;
0698                 if (tx_pause)
0699                     priv->wmm.pkts_paused[i] +=
0700                         ra_list->total_pkt_count;
0701                 else
0702                     priv->wmm.pkts_paused[i] -=
0703                         ra_list->total_pkt_count;
0704             }
0705         }
0706     }
0707 
0708     if (pkt_cnt) {
0709         tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
0710         if (tx_pause)
0711             tx_pkts_queued -= pkt_cnt;
0712         else
0713             tx_pkts_queued += pkt_cnt;
0714 
0715         atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
0716         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
0717     }
0718     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0719 }
0720 
0721 /*
0722  * This function retrieves an RA list node for a given TID and
0723  * RA address pair.
0724  *
0725  * If no such node is found, a new node is added first and then
0726  * retrieved.
0727  */
0728 struct mwifiex_ra_list_tbl *
0729 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
0730                 const u8 *ra_addr)
0731 {
0732     struct mwifiex_ra_list_tbl *ra_list;
0733 
0734     ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
0735     if (ra_list)
0736         return ra_list;
0737     mwifiex_ralist_add(priv, ra_addr);
0738 
0739     return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
0740 }
0741 
0742 /*
0743  * This function deletes RA list nodes for given mac for all TIDs.
0744  * Function also decrements TX pending count accordingly.
0745  */
0746 void
0747 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
0748 {
0749     struct mwifiex_ra_list_tbl *ra_list;
0750     int i;
0751 
0752     spin_lock_bh(&priv->wmm.ra_list_spinlock);
0753 
0754     for (i = 0; i < MAX_NUM_TID; ++i) {
0755         ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
0756 
0757         if (!ra_list)
0758             continue;
0759         mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
0760         if (ra_list->tx_paused)
0761             priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
0762         else
0763             atomic_sub(ra_list->total_pkt_count,
0764                    &priv->wmm.tx_pkts_queued);
0765         list_del(&ra_list->list);
0766         kfree(ra_list);
0767     }
0768     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0769 }
0770 
0771 /*
0772  * This function checks if a particular RA list node exists in a given TID
0773  * table index.
0774  */
0775 int
0776 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
0777             struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
0778 {
0779     struct mwifiex_ra_list_tbl *rlist;
0780 
0781     list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
0782                 list) {
0783         if (rlist == ra_list)
0784             return true;
0785     }
0786 
0787     return false;
0788 }
0789 
0790 /*
0791  * This function adds a packet to bypass TX queue.
0792  * This is special TX queue for packets which can be sent even when port_open
0793  * is false.
0794  */
0795 void
0796 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
0797                    struct sk_buff *skb)
0798 {
0799     skb_queue_tail(&priv->bypass_txq, skb);
0800 }
0801 
0802 /*
0803  * This function adds a packet to WMM queue.
0804  *
0805  * In disconnected state the packet is immediately dropped and the
0806  * packet send completion callback is called with status failure.
0807  *
0808  * Otherwise, the correct RA list node is located and the packet
0809  * is queued at the list tail.
0810  */
0811 void
0812 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
0813                 struct sk_buff *skb)
0814 {
0815     struct mwifiex_adapter *adapter = priv->adapter;
0816     u32 tid;
0817     struct mwifiex_ra_list_tbl *ra_list;
0818     u8 ra[ETH_ALEN], tid_down;
0819     struct list_head list_head;
0820     int tdls_status = TDLS_NOT_SETUP;
0821     struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
0822     struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
0823 
0824     memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
0825 
0826     if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
0827         ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
0828         if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
0829             mwifiex_dbg(adapter, DATA,
0830                     "TDLS setup packet for %pM.\t"
0831                     "Don't block\n", ra);
0832         else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
0833             tdls_status = mwifiex_get_tdls_link_status(priv, ra);
0834     }
0835 
0836     if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
0837         mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
0838         mwifiex_write_data_complete(adapter, skb, 0, -1);
0839         return;
0840     }
0841 
0842     tid = skb->priority;
0843 
0844     spin_lock_bh(&priv->wmm.ra_list_spinlock);
0845 
0846     tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
0847 
0848     /* In case of infra as we have already created the list during
0849        association we just don't have to call get_queue_raptr, we will
0850        have only 1 raptr for a tid in case of infra */
0851     if (!mwifiex_queuing_ra_based(priv) &&
0852         !mwifiex_is_skb_mgmt_frame(skb)) {
0853         switch (tdls_status) {
0854         case TDLS_SETUP_COMPLETE:
0855         case TDLS_CHAN_SWITCHING:
0856         case TDLS_IN_BASE_CHAN:
0857         case TDLS_IN_OFF_CHAN:
0858             ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
0859                                   ra);
0860             tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
0861             break;
0862         case TDLS_SETUP_INPROGRESS:
0863             skb_queue_tail(&priv->tdls_txq, skb);
0864             spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0865             return;
0866         default:
0867             list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
0868             ra_list = list_first_entry_or_null(&list_head,
0869                     struct mwifiex_ra_list_tbl, list);
0870             break;
0871         }
0872     } else {
0873         memcpy(ra, skb->data, ETH_ALEN);
0874         if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
0875             eth_broadcast_addr(ra);
0876         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
0877     }
0878 
0879     if (!ra_list) {
0880         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0881         mwifiex_write_data_complete(adapter, skb, 0, -1);
0882         return;
0883     }
0884 
0885     skb_queue_tail(&ra_list->skb_head, skb);
0886 
0887     ra_list->ba_pkt_count++;
0888     ra_list->total_pkt_count++;
0889 
0890     if (atomic_read(&priv->wmm.highest_queued_prio) <
0891                         priv->tos_to_tid_inv[tid_down])
0892         atomic_set(&priv->wmm.highest_queued_prio,
0893                priv->tos_to_tid_inv[tid_down]);
0894 
0895     if (ra_list->tx_paused)
0896         priv->wmm.pkts_paused[tid_down]++;
0897     else
0898         atomic_inc(&priv->wmm.tx_pkts_queued);
0899 
0900     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0901 }
0902 
0903 /*
0904  * This function processes the get WMM status command response from firmware.
0905  *
0906  * The response may contain multiple TLVs -
0907  *      - AC Queue status TLVs
0908  *      - Current WMM Parameter IE TLV
0909  *      - Admission Control action frame TLVs
0910  *
0911  * This function parses the TLVs and then calls further specific functions
0912  * to process any changes in the queue prioritize or state.
0913  */
0914 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
0915                    const struct host_cmd_ds_command *resp)
0916 {
0917     u8 *curr = (u8 *) &resp->params.get_wmm_status;
0918     uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
0919     int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
0920     bool valid = true;
0921 
0922     struct mwifiex_ie_types_data *tlv_hdr;
0923     struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
0924     struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
0925     struct mwifiex_wmm_ac_status *ac_status;
0926 
0927     mwifiex_dbg(priv->adapter, INFO,
0928             "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
0929             resp_len);
0930 
0931     while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
0932         tlv_hdr = (struct mwifiex_ie_types_data *) curr;
0933         tlv_len = le16_to_cpu(tlv_hdr->header.len);
0934 
0935         if (resp_len < tlv_len + sizeof(tlv_hdr->header))
0936             break;
0937 
0938         switch (le16_to_cpu(tlv_hdr->header.type)) {
0939         case TLV_TYPE_WMMQSTATUS:
0940             tlv_wmm_qstatus =
0941                 (struct mwifiex_ie_types_wmm_queue_status *)
0942                 tlv_hdr;
0943             mwifiex_dbg(priv->adapter, CMD,
0944                     "info: CMD_RESP: WMM_GET_STATUS:\t"
0945                     "QSTATUS TLV: %d, %d, %d\n",
0946                     tlv_wmm_qstatus->queue_index,
0947                     tlv_wmm_qstatus->flow_required,
0948                     tlv_wmm_qstatus->disabled);
0949 
0950             ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
0951                              queue_index];
0952             ac_status->disabled = tlv_wmm_qstatus->disabled;
0953             ac_status->flow_required =
0954                         tlv_wmm_qstatus->flow_required;
0955             ac_status->flow_created = tlv_wmm_qstatus->flow_created;
0956             break;
0957 
0958         case WLAN_EID_VENDOR_SPECIFIC:
0959             /*
0960              * Point the regular IEEE IE 2 bytes into the Marvell IE
0961              *   and setup the IEEE IE type and length byte fields
0962              */
0963 
0964             wmm_param_ie =
0965                 (struct ieee_types_wmm_parameter *) (curr +
0966                                     2);
0967             wmm_param_ie->vend_hdr.len = (u8) tlv_len;
0968             wmm_param_ie->vend_hdr.element_id =
0969                         WLAN_EID_VENDOR_SPECIFIC;
0970 
0971             mwifiex_dbg(priv->adapter, CMD,
0972                     "info: CMD_RESP: WMM_GET_STATUS:\t"
0973                     "WMM Parameter Set Count: %d\n",
0974                     wmm_param_ie->qos_info_bitmap & mask);
0975 
0976             if (wmm_param_ie->vend_hdr.len + 2 >
0977                 sizeof(struct ieee_types_wmm_parameter))
0978                 break;
0979 
0980             memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
0981                    wmm_ie, wmm_param_ie,
0982                    wmm_param_ie->vend_hdr.len + 2);
0983 
0984             break;
0985 
0986         default:
0987             valid = false;
0988             break;
0989         }
0990 
0991         curr += (tlv_len + sizeof(tlv_hdr->header));
0992         resp_len -= (tlv_len + sizeof(tlv_hdr->header));
0993     }
0994 
0995     mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
0996     mwifiex_wmm_setup_ac_downgrade(priv);
0997 
0998     return 0;
0999 }
1000 
1001 /*
1002  * Callback handler from the command module to allow insertion of a WMM TLV.
1003  *
1004  * If the BSS we are associating to supports WMM, this function adds the
1005  * required WMM Information IE to the association request command buffer in
1006  * the form of a Marvell extended IEEE IE.
1007  */
1008 u32
1009 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
1010                     u8 **assoc_buf,
1011                     struct ieee_types_wmm_parameter *wmm_ie,
1012                     struct ieee80211_ht_cap *ht_cap)
1013 {
1014     struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
1015     u32 ret_len = 0;
1016 
1017     /* Null checks */
1018     if (!assoc_buf)
1019         return 0;
1020     if (!(*assoc_buf))
1021         return 0;
1022 
1023     if (!wmm_ie)
1024         return 0;
1025 
1026     mwifiex_dbg(priv->adapter, INFO,
1027             "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1028             wmm_ie->vend_hdr.element_id);
1029 
1030     if ((priv->wmm_required ||
1031          (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1032          priv->adapter->config_bands & BAND_AN))) &&
1033         wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1034         wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1035         wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1036         wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1037         memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1038                le16_to_cpu(wmm_tlv->header.len));
1039         if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1040             memcpy((u8 *) (wmm_tlv->wmm_ie
1041                        + le16_to_cpu(wmm_tlv->header.len)
1042                        - sizeof(priv->wmm_qosinfo)),
1043                    &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1044 
1045         ret_len = sizeof(wmm_tlv->header)
1046               + le16_to_cpu(wmm_tlv->header.len);
1047 
1048         *assoc_buf += ret_len;
1049     }
1050 
1051     return ret_len;
1052 }
1053 
1054 /*
1055  * This function computes the time delay in the driver queues for a
1056  * given packet.
1057  *
1058  * When the packet is received at the OS/Driver interface, the current
1059  * time is set in the packet structure. The difference between the present
1060  * time and that received time is computed in this function and limited
1061  * based on pre-compiled limits in the driver.
1062  */
1063 u8
1064 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1065                   const struct sk_buff *skb)
1066 {
1067     u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1068     u8 ret_val;
1069 
1070     /*
1071      * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1072      *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1073      *
1074      * Pass max value if queue_delay is beyond the uint8 range
1075      */
1076     ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1077 
1078     mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1079             "%d ms sent to FW\n", queue_delay, ret_val);
1080 
1081     return ret_val;
1082 }
1083 
1084 /*
1085  * This function retrieves the highest priority RA list table pointer.
1086  */
1087 static struct mwifiex_ra_list_tbl *
1088 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1089                      struct mwifiex_private **priv, int *tid)
1090 {
1091     struct mwifiex_private *priv_tmp;
1092     struct mwifiex_ra_list_tbl *ptr;
1093     struct mwifiex_tid_tbl *tid_ptr;
1094     atomic_t *hqp;
1095     int i, j;
1096 
1097     /* check the BSS with highest priority first */
1098     for (j = adapter->priv_num - 1; j >= 0; --j) {
1099         /* iterate over BSS with the equal priority */
1100         list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1101                     &adapter->bss_prio_tbl[j].bss_prio_head,
1102                     list) {
1103 
1104 try_again:
1105             priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1106 
1107             if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
1108                  !priv_tmp->port_open) ||
1109                 (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1110                 continue;
1111 
1112             if (adapter->if_ops.is_port_ready &&
1113                 !adapter->if_ops.is_port_ready(priv_tmp))
1114                 continue;
1115 
1116             /* iterate over the WMM queues of the BSS */
1117             hqp = &priv_tmp->wmm.highest_queued_prio;
1118             for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1119 
1120                 spin_lock_bh(&priv_tmp->wmm.ra_list_spinlock);
1121 
1122                 tid_ptr = &(priv_tmp)->wmm.
1123                     tid_tbl_ptr[tos_to_tid[i]];
1124 
1125                 /* iterate over receiver addresses */
1126                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1127                             list) {
1128 
1129                     if (!ptr->tx_paused &&
1130                         !skb_queue_empty(&ptr->skb_head))
1131                         /* holds both locks */
1132                         goto found;
1133                 }
1134 
1135                 spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
1136             }
1137 
1138             if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) != 0) {
1139                 atomic_set(&priv_tmp->wmm.highest_queued_prio,
1140                        HIGH_PRIO_TID);
1141                 /* Iterate current private once more, since
1142                  * there still exist packets in data queue
1143                  */
1144                 goto try_again;
1145             } else
1146                 atomic_set(&priv_tmp->wmm.highest_queued_prio,
1147                        NO_PKT_PRIO_TID);
1148         }
1149     }
1150 
1151     return NULL;
1152 
1153 found:
1154     /* holds ra_list_spinlock */
1155     if (atomic_read(hqp) > i)
1156         atomic_set(hqp, i);
1157     spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
1158 
1159     *priv = priv_tmp;
1160     *tid = tos_to_tid[i];
1161 
1162     return ptr;
1163 }
1164 
1165 /* This functions rotates ra and bss lists so packets are picked round robin.
1166  *
1167  * After a packet is successfully transmitted, rotate the ra list, so the ra
1168  * next to the one transmitted, will come first in the list. This way we pick
1169  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1170  * priority.
1171  *
1172  * Function also increments wmm.packets_out counter.
1173  */
1174 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1175                  struct mwifiex_ra_list_tbl *ra,
1176                  int tid)
1177 {
1178     struct mwifiex_adapter *adapter = priv->adapter;
1179     struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1180     struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1181 
1182     spin_lock_bh(&tbl[priv->bss_priority].bss_prio_lock);
1183     /*
1184      * dirty trick: we remove 'head' temporarily and reinsert it after
1185      * curr bss node. imagine list to stay fixed while head is moved
1186      */
1187     list_move(&tbl[priv->bss_priority].bss_prio_head,
1188           &tbl[priv->bss_priority].bss_prio_cur->list);
1189     spin_unlock_bh(&tbl[priv->bss_priority].bss_prio_lock);
1190 
1191     spin_lock_bh(&priv->wmm.ra_list_spinlock);
1192     if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1193         priv->wmm.packets_out[tid]++;
1194         /* same as above */
1195         list_move(&tid_ptr->ra_list, &ra->list);
1196     }
1197     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1198 }
1199 
1200 /*
1201  * This function checks if 11n aggregation is possible.
1202  */
1203 static int
1204 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1205                     struct mwifiex_ra_list_tbl *ptr,
1206                     int max_buf_size)
1207 {
1208     int count = 0, total_size = 0;
1209     struct sk_buff *skb, *tmp;
1210     int max_amsdu_size;
1211 
1212     if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1213         ptr->is_11n_enabled)
1214         max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1215     else
1216         max_amsdu_size = max_buf_size;
1217 
1218     skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1219         total_size += skb->len;
1220         if (total_size >= max_amsdu_size)
1221             break;
1222         if (++count >= MIN_NUM_AMSDU)
1223             return true;
1224     }
1225 
1226     return false;
1227 }
1228 
1229 /*
1230  * This function sends a single packet to firmware for transmission.
1231  */
1232 static void
1233 mwifiex_send_single_packet(struct mwifiex_private *priv,
1234                struct mwifiex_ra_list_tbl *ptr, int ptr_index)
1235                __releases(&priv->wmm.ra_list_spinlock)
1236 {
1237     struct sk_buff *skb, *skb_next;
1238     struct mwifiex_tx_param tx_param;
1239     struct mwifiex_adapter *adapter = priv->adapter;
1240     struct mwifiex_txinfo *tx_info;
1241 
1242     if (skb_queue_empty(&ptr->skb_head)) {
1243         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1244         mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1245         return;
1246     }
1247 
1248     skb = skb_dequeue(&ptr->skb_head);
1249 
1250     tx_info = MWIFIEX_SKB_TXCB(skb);
1251     mwifiex_dbg(adapter, DATA,
1252             "data: dequeuing the packet %p %p\n", ptr, skb);
1253 
1254     ptr->total_pkt_count--;
1255 
1256     if (!skb_queue_empty(&ptr->skb_head))
1257         skb_next = skb_peek(&ptr->skb_head);
1258     else
1259         skb_next = NULL;
1260 
1261     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1262 
1263     tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1264                 sizeof(struct txpd) : 0);
1265 
1266     if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1267         /* Queue the packet back at the head */
1268         spin_lock_bh(&priv->wmm.ra_list_spinlock);
1269 
1270         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1271             spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1272             mwifiex_write_data_complete(adapter, skb, 0, -1);
1273             return;
1274         }
1275 
1276         skb_queue_tail(&ptr->skb_head, skb);
1277 
1278         ptr->total_pkt_count++;
1279         ptr->ba_pkt_count++;
1280         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1281         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1282     } else {
1283         mwifiex_rotate_priolists(priv, ptr, ptr_index);
1284         atomic_dec(&priv->wmm.tx_pkts_queued);
1285     }
1286 }
1287 
1288 /*
1289  * This function checks if the first packet in the given RA list
1290  * is already processed or not.
1291  */
1292 static int
1293 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1294              struct mwifiex_ra_list_tbl *ptr)
1295 {
1296     struct sk_buff *skb;
1297     struct mwifiex_txinfo *tx_info;
1298 
1299     if (skb_queue_empty(&ptr->skb_head))
1300         return false;
1301 
1302     skb = skb_peek(&ptr->skb_head);
1303 
1304     tx_info = MWIFIEX_SKB_TXCB(skb);
1305     if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1306         return true;
1307 
1308     return false;
1309 }
1310 
1311 /*
1312  * This function sends a single processed packet to firmware for
1313  * transmission.
1314  */
1315 static void
1316 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1317                   struct mwifiex_ra_list_tbl *ptr, int ptr_index)
1318                 __releases(&priv->wmm.ra_list_spinlock)
1319 {
1320     struct mwifiex_tx_param tx_param;
1321     struct mwifiex_adapter *adapter = priv->adapter;
1322     int ret = -1;
1323     struct sk_buff *skb, *skb_next;
1324     struct mwifiex_txinfo *tx_info;
1325 
1326     if (skb_queue_empty(&ptr->skb_head)) {
1327         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1328         return;
1329     }
1330 
1331     skb = skb_dequeue(&ptr->skb_head);
1332 
1333     if (adapter->data_sent || adapter->tx_lock_flag) {
1334         ptr->total_pkt_count--;
1335         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1336         skb_queue_tail(&adapter->tx_data_q, skb);
1337         atomic_dec(&priv->wmm.tx_pkts_queued);
1338         atomic_inc(&adapter->tx_queued);
1339         return;
1340     }
1341 
1342     if (!skb_queue_empty(&ptr->skb_head))
1343         skb_next = skb_peek(&ptr->skb_head);
1344     else
1345         skb_next = NULL;
1346 
1347     tx_info = MWIFIEX_SKB_TXCB(skb);
1348 
1349     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1350 
1351     tx_param.next_pkt_len =
1352         ((skb_next) ? skb_next->len +
1353          sizeof(struct txpd) : 0);
1354     if (adapter->iface_type == MWIFIEX_USB) {
1355         ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
1356                            skb, &tx_param);
1357     } else {
1358         ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1359                            skb, &tx_param);
1360     }
1361 
1362     switch (ret) {
1363     case -EBUSY:
1364         mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1365         spin_lock_bh(&priv->wmm.ra_list_spinlock);
1366 
1367         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1368             spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1369             mwifiex_write_data_complete(adapter, skb, 0, -1);
1370             return;
1371         }
1372 
1373         skb_queue_tail(&ptr->skb_head, skb);
1374 
1375         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1376         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1377         break;
1378     case -1:
1379         mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1380         adapter->dbg.num_tx_host_to_card_failure++;
1381         mwifiex_write_data_complete(adapter, skb, 0, ret);
1382         break;
1383     case -EINPROGRESS:
1384         break;
1385     case 0:
1386         mwifiex_write_data_complete(adapter, skb, 0, ret);
1387         break;
1388     default:
1389         break;
1390     }
1391     if (ret != -EBUSY) {
1392         mwifiex_rotate_priolists(priv, ptr, ptr_index);
1393         atomic_dec(&priv->wmm.tx_pkts_queued);
1394         spin_lock_bh(&priv->wmm.ra_list_spinlock);
1395         ptr->total_pkt_count--;
1396         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1397     }
1398 }
1399 
1400 /*
1401  * This function dequeues a packet from the highest priority list
1402  * and transmits it.
1403  */
1404 static int
1405 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1406 {
1407     struct mwifiex_ra_list_tbl *ptr;
1408     struct mwifiex_private *priv = NULL;
1409     int ptr_index = 0;
1410     u8 ra[ETH_ALEN];
1411     int tid_del = 0, tid = 0;
1412 
1413     ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1414     if (!ptr)
1415         return -1;
1416 
1417     tid = mwifiex_get_tid(ptr);
1418 
1419     mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1420 
1421     spin_lock_bh(&priv->wmm.ra_list_spinlock);
1422     if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1423         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1424         return -1;
1425     }
1426 
1427     if (mwifiex_is_ptr_processed(priv, ptr)) {
1428         mwifiex_send_processed_packet(priv, ptr, ptr_index);
1429         /* ra_list_spinlock has been freed in
1430            mwifiex_send_processed_packet() */
1431         return 0;
1432     }
1433 
1434     if (!ptr->is_11n_enabled ||
1435         ptr->ba_status ||
1436         priv->wps.session_enable) {
1437         if (ptr->is_11n_enabled &&
1438             ptr->ba_status &&
1439             ptr->amsdu_in_ampdu &&
1440             mwifiex_is_amsdu_allowed(priv, tid) &&
1441             mwifiex_is_11n_aggragation_possible(priv, ptr,
1442                             adapter->tx_buf_size))
1443             mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index);
1444             /* ra_list_spinlock has been freed in
1445              * mwifiex_11n_aggregate_pkt()
1446              */
1447         else
1448             mwifiex_send_single_packet(priv, ptr, ptr_index);
1449             /* ra_list_spinlock has been freed in
1450              * mwifiex_send_single_packet()
1451              */
1452     } else {
1453         if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1454             ptr->ba_pkt_count > ptr->ba_packet_thr) {
1455             if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1456                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1457                               BA_SETUP_INPROGRESS);
1458                 mwifiex_send_addba(priv, tid, ptr->ra);
1459             } else if (mwifiex_find_stream_to_delete
1460                    (priv, tid, &tid_del, ra)) {
1461                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1462                               BA_SETUP_INPROGRESS);
1463                 mwifiex_send_delba(priv, tid_del, ra, 1);
1464             }
1465         }
1466         if (mwifiex_is_amsdu_allowed(priv, tid) &&
1467             mwifiex_is_11n_aggragation_possible(priv, ptr,
1468                             adapter->tx_buf_size))
1469             mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index);
1470             /* ra_list_spinlock has been freed in
1471                mwifiex_11n_aggregate_pkt() */
1472         else
1473             mwifiex_send_single_packet(priv, ptr, ptr_index);
1474             /* ra_list_spinlock has been freed in
1475                mwifiex_send_single_packet() */
1476     }
1477     return 0;
1478 }
1479 
1480 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1481 {
1482     struct mwifiex_tx_param tx_param;
1483     struct sk_buff *skb;
1484     struct mwifiex_txinfo *tx_info;
1485     struct mwifiex_private *priv;
1486     int i;
1487 
1488     if (adapter->data_sent || adapter->tx_lock_flag)
1489         return;
1490 
1491     for (i = 0; i < adapter->priv_num; ++i) {
1492         priv = adapter->priv[i];
1493 
1494         if (!priv)
1495             continue;
1496 
1497         if (adapter->if_ops.is_port_ready &&
1498             !adapter->if_ops.is_port_ready(priv))
1499             continue;
1500 
1501         if (skb_queue_empty(&priv->bypass_txq))
1502             continue;
1503 
1504         skb = skb_dequeue(&priv->bypass_txq);
1505         tx_info = MWIFIEX_SKB_TXCB(skb);
1506 
1507         /* no aggregation for bypass packets */
1508         tx_param.next_pkt_len = 0;
1509 
1510         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1511             skb_queue_head(&priv->bypass_txq, skb);
1512             tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1513         } else {
1514             atomic_dec(&adapter->bypass_tx_pending);
1515         }
1516     }
1517 }
1518 
1519 /*
1520  * This function transmits the highest priority packet awaiting in the
1521  * WMM Queues.
1522  */
1523 void
1524 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1525 {
1526     do {
1527         if (mwifiex_dequeue_tx_packet(adapter))
1528             break;
1529         if (adapter->iface_type != MWIFIEX_SDIO) {
1530             if (adapter->data_sent ||
1531                 adapter->tx_lock_flag)
1532                 break;
1533         } else {
1534             if (atomic_read(&adapter->tx_queued) >=
1535                 MWIFIEX_MAX_PKTS_TXQ)
1536                 break;
1537         }
1538     } while (!mwifiex_wmm_lists_empty(adapter));
1539 }
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