1/* 2 * Marvell Wireless LAN device driver: 802.11n Aggregation 3 * 4 * Copyright (C) 2011, Marvell International Ltd. 5 * 6 * This software file (the "File") is distributed by Marvell International 7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991 8 * (the "License"). You may use, redistribute and/or modify this File in 9 * accordance with the terms and conditions of the License, a copy of which 10 * is available by writing to the Free Software Foundation, Inc., 11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the 12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. 13 * 14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE 16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about 17 * this warranty disclaimer. 18 */ 19 20#include "decl.h" 21#include "ioctl.h" 22#include "util.h" 23#include "fw.h" 24#include "main.h" 25#include "wmm.h" 26#include "11n.h" 27#include "11n_aggr.h" 28 29/* 30 * Creates an AMSDU subframe for aggregation into one AMSDU packet. 31 * 32 * The resultant AMSDU subframe format is - 33 * 34 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+ 35 * | DA | SA | Length | SNAP header | MSDU | 36 * | data[0..5] | data[6..11] | | | data[14..] | 37 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+ 38 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes--> 39 * 40 * This function also computes the amount of padding required to make the 41 * buffer length multiple of 4 bytes. 42 * 43 * Data => |DA|SA|SNAP-TYPE|........ .| 44 * MSDU => |DA|SA|Length|SNAP|...... ..| 45 */ 46static int 47mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr, 48 struct sk_buff *skb_src, int *pad) 49 50{ 51 int dt_offset; 52 struct rfc_1042_hdr snap = { 53 0xaa, /* LLC DSAP */ 54 0xaa, /* LLC SSAP */ 55 0x03, /* LLC CTRL */ 56 {0x00, 0x00, 0x00}, /* SNAP OUI */ 57 0x0000 /* SNAP type */ 58 /* 59 * This field will be overwritten 60 * later with ethertype 61 */ 62 }; 63 struct tx_packet_hdr *tx_header; 64 65 skb_put(skb_aggr, sizeof(*tx_header)); 66 67 tx_header = (struct tx_packet_hdr *) skb_aggr->data; 68 69 /* Copy DA and SA */ 70 dt_offset = 2 * ETH_ALEN; 71 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset); 72 73 /* Copy SNAP header */ 74 snap.snap_type = *(u16 *) ((u8 *)skb_src->data + dt_offset); 75 dt_offset += sizeof(u16); 76 77 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr)); 78 79 skb_pull(skb_src, dt_offset); 80 81 /* Update Length field */ 82 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN); 83 84 /* Add payload */ 85 skb_put(skb_aggr, skb_src->len); 86 memcpy(skb_aggr->data + sizeof(*tx_header), skb_src->data, 87 skb_src->len); 88 *pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len + 89 LLC_SNAP_LEN)) & 3)) : 0; 90 skb_put(skb_aggr, *pad); 91 92 return skb_aggr->len + *pad; 93} 94 95/* 96 * Adds TxPD to AMSDU header. 97 * 98 * Each AMSDU packet will contain one TxPD at the beginning, 99 * followed by multiple AMSDU subframes. 100 */ 101static void 102mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv, 103 struct sk_buff *skb) 104{ 105 struct txpd *local_tx_pd; 106 107 skb_push(skb, sizeof(*local_tx_pd)); 108 109 local_tx_pd = (struct txpd *) skb->data; 110 memset(local_tx_pd, 0, sizeof(struct txpd)); 111 112 /* Original priority has been overwritten */ 113 local_tx_pd->priority = (u8) skb->priority; 114 local_tx_pd->pkt_delay_2ms = 115 mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 116 local_tx_pd->bss_num = priv->bss_num; 117 local_tx_pd->bss_type = priv->bss_type; 118 /* Always zero as the data is followed by struct txpd */ 119 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); 120 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU); 121 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len - 122 sizeof(*local_tx_pd)); 123 124 if (local_tx_pd->tx_control == 0) 125 /* TxCtrl set by user or default */ 126 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 127 128 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 129 priv->adapter->pps_uapsd_mode) { 130 if (true == mwifiex_check_last_packet_indication(priv)) { 131 priv->adapter->tx_lock_flag = true; 132 local_tx_pd->flags = 133 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; 134 } 135 } 136} 137 138/* 139 * Create aggregated packet. 140 * 141 * This function creates an aggregated MSDU packet, by combining buffers 142 * from the RA list. Each individual buffer is encapsulated as an AMSDU 143 * subframe and all such subframes are concatenated together to form the 144 * AMSDU packet. 145 * 146 * A TxPD is also added to the front of the resultant AMSDU packets for 147 * transmission. The resultant packets format is - 148 * 149 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+ 150 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame| 151 * | | 1 | 2 | .. | n | 152 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+ 153 */ 154int 155mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv, 156 struct mwifiex_ra_list_tbl *pra_list, int headroom, 157 int ptrindex, unsigned long ra_list_flags) 158 __releases(&priv->wmm.ra_list_spinlock) 159{ 160 struct mwifiex_adapter *adapter = priv->adapter; 161 struct sk_buff *skb_aggr, *skb_src; 162 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src; 163 int pad = 0, ret; 164 struct mwifiex_tx_param tx_param; 165 struct txpd *ptx_pd = NULL; 166 167 skb_src = skb_peek(&pra_list->skb_head); 168 if (!skb_src) { 169 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 170 ra_list_flags); 171 return 0; 172 } 173 174 tx_info_src = MWIFIEX_SKB_TXCB(skb_src); 175 skb_aggr = dev_alloc_skb(adapter->tx_buf_size); 176 if (!skb_aggr) { 177 dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__); 178 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 179 ra_list_flags); 180 return -1; 181 } 182 skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); 183 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); 184 185 tx_info_aggr->bss_type = tx_info_src->bss_type; 186 tx_info_aggr->bss_num = tx_info_src->bss_num; 187 skb_aggr->priority = skb_src->priority; 188 189 do { 190 /* Check if AMSDU can accommodate this MSDU */ 191 if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN)) 192 break; 193 194 skb_src = skb_dequeue(&pra_list->skb_head); 195 196 pra_list->total_pkts_size -= skb_src->len; 197 198 atomic_dec(&priv->wmm.tx_pkts_queued); 199 200 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 201 ra_list_flags); 202 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); 203 204 mwifiex_write_data_complete(adapter, skb_src, 0); 205 206 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); 207 208 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 209 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 210 ra_list_flags); 211 return -1; 212 } 213 214 if (skb_tailroom(skb_aggr) < pad) { 215 pad = 0; 216 break; 217 } 218 skb_put(skb_aggr, pad); 219 220 skb_src = skb_peek(&pra_list->skb_head); 221 222 } while (skb_src); 223 224 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); 225 226 /* Last AMSDU packet does not need padding */ 227 skb_trim(skb_aggr, skb_aggr->len - pad); 228 229 /* Form AMSDU */ 230 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); 231 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 232 ptx_pd = (struct txpd *)skb_aggr->data; 233 234 skb_push(skb_aggr, headroom); 235 236 /* 237 * Padding per MSDU will affect the length of next 238 * packet and hence the exact length of next packet 239 * is uncertain here. 240 * 241 * Also, aggregation of transmission buffer, while 242 * downloading the data to the card, wont gain much 243 * on the AMSDU packets as the AMSDU packets utilizes 244 * the transmission buffer space to the maximum 245 * (adapter->tx_buf_size). 246 */ 247 tx_param.next_pkt_len = 0; 248 249 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 250 skb_aggr, &tx_param); 251 switch (ret) { 252 case -EBUSY: 253 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); 254 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 255 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 256 ra_list_flags); 257 mwifiex_write_data_complete(adapter, skb_aggr, -1); 258 return -1; 259 } 260 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 261 adapter->pps_uapsd_mode && adapter->tx_lock_flag) { 262 priv->adapter->tx_lock_flag = false; 263 if (ptx_pd) 264 ptx_pd->flags = 0; 265 } 266 267 skb_queue_tail(&pra_list->skb_head, skb_aggr); 268 269 pra_list->total_pkts_size += skb_aggr->len; 270 271 atomic_inc(&priv->wmm.tx_pkts_queued); 272 273 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; 274 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 275 ra_list_flags); 276 dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); 277 break; 278 case -1: 279 adapter->data_sent = false; 280 dev_err(adapter->dev, "%s: host_to_card failed: %#x\n", 281 __func__, ret); 282 adapter->dbg.num_tx_host_to_card_failure++; 283 mwifiex_write_data_complete(adapter, skb_aggr, ret); 284 return 0; 285 case -EINPROGRESS: 286 adapter->data_sent = false; 287 break; 288 case 0: 289 mwifiex_write_data_complete(adapter, skb_aggr, ret); 290 break; 291 default: 292 break; 293 } 294 if (ret != -EBUSY) { 295 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); 296 if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 297 priv->wmm.packets_out[ptrindex]++; 298 priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list; 299 } 300 /* Now bss_prio_cur pointer points to next node */ 301 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur = 302 list_first_entry( 303 &adapter->bss_prio_tbl[priv->bss_priority] 304 .bss_prio_cur->list, 305 struct mwifiex_bss_prio_node, list); 306 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 307 ra_list_flags); 308 } 309 310 return 0; 311} 312