1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NXP Wireless LAN device driver: 802.11n Aggregation 4 * 5 * Copyright 2011-2020 NXP 6 */ 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 the 29 * buffer length multiple of 4 bytes. 30 * 31 * Data => |DA|SA|SNAP-TYPE|........ .| 32 * MSDU => |DA|SA|Length|SNAP|...... ..| 33 */ 34 static int 35 mwifiex_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 overwritten 48 * later with ethertype 49 */ 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 */ 86 static void 87 mwifiex_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 buffers 131 * from the RA list. Each individual buffer is encapsulated as an AMSDU 132 * subframe and all such subframes are concatenated together to form the 133 * AMSDU packet. 134 * 135 * A TxPD is also added to the front of the resultant AMSDU packets for 136 * 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 */ 143 int 144 mwifiex_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 interface 172 * 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 else 240 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