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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * NXP Wireless LAN device driver: 802.11n Aggregation4 *5 * Copyright 2011-2020 NXP6 */7 8#include "decl.h"9#include "ioctl.h"10#include "util.h"11#include "fw.h"12#include "main.h"13#include "wmm.h"14#include "11n.h"15#include "11n_aggr.h"16 17/*18 * Creates an AMSDU subframe for aggregation into one AMSDU packet.19 *20 * The resultant AMSDU subframe format is -21 *22 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+23 * | DA | SA | Length | SNAP header | MSDU |24 * | data[0..5] | data[6..11] | | | data[14..] |25 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+26 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->27 *28 * This function also computes the amount of padding required to make the29 * buffer length multiple of 4 bytes.30 *31 * Data => |DA|SA|SNAP-TYPE|........ .|32 * MSDU => |DA|SA|Length|SNAP|...... ..|33 */34static int35mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,36 struct sk_buff *skb_src, int *pad)37 38{39 int dt_offset;40 struct rfc_1042_hdr snap = {41 0xaa, /* LLC DSAP */42 0xaa, /* LLC SSAP */43 0x03, /* LLC CTRL */44 {0x00, 0x00, 0x00}, /* SNAP OUI */45 0x0000 /* SNAP type */46 /*47 * This field will be overwritten48 * later with ethertype49 */50 };51 struct tx_packet_hdr *tx_header;52 53 tx_header = skb_put(skb_aggr, sizeof(*tx_header));54 55 /* Copy DA and SA */56 dt_offset = 2 * ETH_ALEN;57 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);58 59 /* Copy SNAP header */60 snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;61 62 dt_offset += sizeof(__be16);63 64 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));65 66 skb_pull(skb_src, dt_offset);67 68 /* Update Length field */69 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);70 71 /* Add payload */72 skb_put_data(skb_aggr, skb_src->data, skb_src->len);73 74 /* Add padding for new MSDU to start from 4 byte boundary */75 *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;76 77 return skb_aggr->len + *pad;78}79 80/*81 * Adds TxPD to AMSDU header.82 *83 * Each AMSDU packet will contain one TxPD at the beginning,84 * followed by multiple AMSDU subframes.85 */86static void87mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,88 struct sk_buff *skb)89{90 struct txpd *local_tx_pd;91 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);92 93 skb_push(skb, sizeof(*local_tx_pd));94 95 local_tx_pd = (struct txpd *) skb->data;96 memset(local_tx_pd, 0, sizeof(struct txpd));97 98 /* Original priority has been overwritten */99 local_tx_pd->priority = (u8) skb->priority;100 local_tx_pd->pkt_delay_2ms =101 mwifiex_wmm_compute_drv_pkt_delay(priv, skb);102 local_tx_pd->bss_num = priv->bss_num;103 local_tx_pd->bss_type = priv->bss_type;104 /* Always zero as the data is followed by struct txpd */105 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));106 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);107 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -108 sizeof(*local_tx_pd));109 110 if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)111 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;112 113 if (local_tx_pd->tx_control == 0)114 /* TxCtrl set by user or default */115 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);116 117 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&118 priv->adapter->pps_uapsd_mode) {119 if (true == mwifiex_check_last_packet_indication(priv)) {120 priv->adapter->tx_lock_flag = true;121 local_tx_pd->flags =122 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;123 }124 }125}126 127/*128 * Create aggregated packet.129 *130 * This function creates an aggregated MSDU packet, by combining buffers131 * from the RA list. Each individual buffer is encapsulated as an AMSDU132 * subframe and all such subframes are concatenated together to form the133 * AMSDU packet.134 *135 * A TxPD is also added to the front of the resultant AMSDU packets for136 * transmission. The resultant packets format is -137 *138 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+139 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|140 * | | 1 | 2 | .. | n |141 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+142 */143int144mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,145 struct mwifiex_ra_list_tbl *pra_list,146 int ptrindex)147 __releases(&priv->wmm.ra_list_spinlock)148{149 struct mwifiex_adapter *adapter = priv->adapter;150 struct sk_buff *skb_aggr, *skb_src;151 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;152 int pad = 0, aggr_num = 0, ret;153 struct mwifiex_tx_param tx_param;154 struct txpd *ptx_pd = NULL;155 int headroom = adapter->intf_hdr_len;156 157 skb_src = skb_peek(&pra_list->skb_head);158 if (!skb_src) {159 spin_unlock_bh(&priv->wmm.ra_list_spinlock);160 return 0;161 }162 163 tx_info_src = MWIFIEX_SKB_TXCB(skb_src);164 skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,165 GFP_ATOMIC);166 if (!skb_aggr) {167 spin_unlock_bh(&priv->wmm.ra_list_spinlock);168 return -1;169 }170 171 /* skb_aggr->data already 64 byte align, just reserve bus interface172 * header and txpd.173 */174 skb_reserve(skb_aggr, headroom + sizeof(struct txpd));175 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);176 177 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));178 tx_info_aggr->bss_type = tx_info_src->bss_type;179 tx_info_aggr->bss_num = tx_info_src->bss_num;180 181 if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)182 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;183 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;184 skb_aggr->priority = skb_src->priority;185 skb_aggr->tstamp = skb_src->tstamp;186 187 do {188 /* Check if AMSDU can accommodate this MSDU */189 if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >190 adapter->tx_buf_size)191 break;192 193 skb_src = skb_dequeue(&pra_list->skb_head);194 pra_list->total_pkt_count--;195 atomic_dec(&priv->wmm.tx_pkts_queued);196 aggr_num++;197 spin_unlock_bh(&priv->wmm.ra_list_spinlock);198 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);199 200 mwifiex_write_data_complete(adapter, skb_src, 0, 0);201 202 spin_lock_bh(&priv->wmm.ra_list_spinlock);203 204 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {205 spin_unlock_bh(&priv->wmm.ra_list_spinlock);206 return -1;207 }208 209 if (skb_tailroom(skb_aggr) < pad) {210 pad = 0;211 break;212 }213 skb_put(skb_aggr, pad);214 215 skb_src = skb_peek(&pra_list->skb_head);216 217 } while (skb_src);218 219 spin_unlock_bh(&priv->wmm.ra_list_spinlock);220 221 /* Last AMSDU packet does not need padding */222 skb_trim(skb_aggr, skb_aggr->len - pad);223 224 /* Form AMSDU */225 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);226 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)227 ptx_pd = (struct txpd *)skb_aggr->data;228 229 skb_push(skb_aggr, headroom);230 tx_info_aggr->aggr_num = aggr_num * 2;231 if (adapter->data_sent || adapter->tx_lock_flag) {232 atomic_add(aggr_num * 2, &adapter->tx_queued);233 skb_queue_tail(&adapter->tx_data_q, skb_aggr);234 return 0;235 }236 237 if (skb_src)238 tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);239 else240 tx_param.next_pkt_len = 0;241 242 if (adapter->iface_type == MWIFIEX_USB) {243 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,244 skb_aggr, &tx_param);245 } else {246 247 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,248 skb_aggr, &tx_param);249 }250 switch (ret) {251 case -EBUSY:252 spin_lock_bh(&priv->wmm.ra_list_spinlock);253 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {254 spin_unlock_bh(&priv->wmm.ra_list_spinlock);255 mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);256 return -1;257 }258 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&259 adapter->pps_uapsd_mode && adapter->tx_lock_flag) {260 priv->adapter->tx_lock_flag = false;261 if (ptx_pd)262 ptx_pd->flags = 0;263 }264 265 skb_queue_tail(&pra_list->skb_head, skb_aggr);266 267 pra_list->total_pkt_count++;268 269 atomic_inc(&priv->wmm.tx_pkts_queued);270 271 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;272 spin_unlock_bh(&priv->wmm.ra_list_spinlock);273 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");274 break;275 case -1:276 mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",277 __func__, ret);278 adapter->dbg.num_tx_host_to_card_failure++;279 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);280 return 0;281 case -EINPROGRESS:282 break;283 case 0:284 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);285 break;286 default:287 break;288 }289 if (ret != -EBUSY) {290 mwifiex_rotate_priolists(priv, pra_list, ptrindex);291 }292 293 return 0;294}295