marvell/mwifiex/11n_aggr.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * NXP Wireless LAN device driver: 802.11n Aggregation
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_aggr.h"
0016
0017 /*
0018  * Creates an AMSDU subframe for aggregation into one AMSDU packet.
0019  *
0020  * The resultant AMSDU subframe format is -
0021  *
0022  * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
0023  * |     DA     |     SA      |   Length   | SNAP header |   MSDU     |
0024  * | data[0..5] | data[6..11] |            |             | data[14..] |
0025  * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
0026  * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
0027  *
0028  * This function also computes the amount of padding required to make the
0029  * buffer length multiple of 4 bytes.
0030  *
0031  * Data => |DA|SA|SNAP-TYPE|........    .|
0032  * MSDU => |DA|SA|Length|SNAP|......   ..|
0033  */
0034 static int
0035 mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
0036                struct sk_buff *skb_src, int *pad)
0037
0038 {
0039     int dt_offset;
0040     struct rfc_1042_hdr snap = {
0041         0xaa,       /* LLC DSAP */
0042         0xaa,       /* LLC SSAP */
0043         0x03,       /* LLC CTRL */
0044         {0x00, 0x00, 0x00}, /* SNAP OUI */
0045         0x0000      /* SNAP type */
0046             /*
0047              * This field will be overwritten
0048              * later with ethertype
0049              */
0050     };
0051     struct tx_packet_hdr *tx_header;
0052
0053     tx_header = skb_put(skb_aggr, sizeof(*tx_header));
0054
0055     /* Copy DA and SA */
0056     dt_offset = 2 * ETH_ALEN;
0057     memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
0058
0059     /* Copy SNAP header */
0060     snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
0061
0062     dt_offset += sizeof(__be16);
0063
0064     memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
0065
0066     skb_pull(skb_src, dt_offset);
0067
0068     /* Update Length field */
0069     tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
0070
0071     /* Add payload */
0072     skb_put_data(skb_aggr, skb_src->data, skb_src->len);
0073
0074     /* Add padding for new MSDU to start from 4 byte boundary */
0075     *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
0076
0077     return skb_aggr->len + *pad;
0078 }
0079
0080 /*
0081  * Adds TxPD to AMSDU header.
0082  *
0083  * Each AMSDU packet will contain one TxPD at the beginning,
0084  * followed by multiple AMSDU subframes.
0085  */
0086 static void
0087 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
0088                 struct sk_buff *skb)
0089 {
0090     struct txpd *local_tx_pd;
0091     struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
0092
0093     skb_push(skb, sizeof(*local_tx_pd));
0094
0095     local_tx_pd = (struct txpd *) skb->data;
0096     memset(local_tx_pd, 0, sizeof(struct txpd));
0097
0098     /* Original priority has been overwritten */
0099     local_tx_pd->priority = (u8) skb->priority;
0100     local_tx_pd->pkt_delay_2ms =
0101         mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
0102     local_tx_pd->bss_num = priv->bss_num;
0103     local_tx_pd->bss_type = priv->bss_type;
0104     /* Always zero as the data is followed by struct txpd */
0105     local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
0106     local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
0107     local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
0108                          sizeof(*local_tx_pd));
0109
0110     if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
0111         local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
0112
0113     if (local_tx_pd->tx_control == 0)
0114         /* TxCtrl set by user or default */
0115         local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
0116
0117     if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
0118         priv->adapter->pps_uapsd_mode) {
0119         if (true == mwifiex_check_last_packet_indication(priv)) {
0120             priv->adapter->tx_lock_flag = true;
0121             local_tx_pd->flags =
0122                 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
0123         }
0124     }
0125 }
0126
0127 /*
0128  * Create aggregated packet.
0129  *
0130  * This function creates an aggregated MSDU packet, by combining buffers
0131  * from the RA list. Each individual buffer is encapsulated as an AMSDU
0132  * subframe and all such subframes are concatenated together to form the
0133  * AMSDU packet.
0134  *
0135  * A TxPD is also added to the front of the resultant AMSDU packets for
0136  * transmission. The resultant packets format is -
0137  *
0138  * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
0139  * |    TxPD   |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
0140  * |           |       1       |       2       | .. |       n       |
0141  * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
0142  */
0143 int
0144 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
0145               struct mwifiex_ra_list_tbl *pra_list,
0146               int ptrindex)
0147               __releases(&priv->wmm.ra_list_spinlock)
0148 {
0149     struct mwifiex_adapter *adapter = priv->adapter;
0150     struct sk_buff *skb_aggr, *skb_src;
0151     struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
0152     int pad = 0, aggr_num = 0, ret;
0153     struct mwifiex_tx_param tx_param;
0154     struct txpd *ptx_pd = NULL;
0155     int headroom = adapter->intf_hdr_len;
0156
0157     skb_src = skb_peek(&pra_list->skb_head);
0158     if (!skb_src) {
0159         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0160         return 0;
0161     }
0162
0163     tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
0164     skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
0165                            GFP_ATOMIC);
0166     if (!skb_aggr) {
0167         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0168         return -1;
0169     }
0170
0171     /* skb_aggr->data already 64 byte align, just reserve bus interface
0172      * header and txpd.
0173      */
0174     skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
0175     tx_info_aggr =  MWIFIEX_SKB_TXCB(skb_aggr);
0176
0177     memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
0178     tx_info_aggr->bss_type = tx_info_src->bss_type;
0179     tx_info_aggr->bss_num = tx_info_src->bss_num;
0180
0181     if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
0182         tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
0183     tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
0184     skb_aggr->priority = skb_src->priority;
0185     skb_aggr->tstamp = skb_src->tstamp;
0186
0187     do {
0188         /* Check if AMSDU can accommodate this MSDU */
0189         if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
0190             adapter->tx_buf_size)
0191             break;
0192
0193         skb_src = skb_dequeue(&pra_list->skb_head);
0194         pra_list->total_pkt_count--;
0195         atomic_dec(&priv->wmm.tx_pkts_queued);
0196         aggr_num++;
0197         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0198         mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
0199
0200         mwifiex_write_data_complete(adapter, skb_src, 0, 0);
0201
0202         spin_lock_bh(&priv->wmm.ra_list_spinlock);
0203
0204         if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
0205             spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0206             return -1;
0207         }
0208
0209         if (skb_tailroom(skb_aggr) < pad) {
0210             pad = 0;
0211             break;
0212         }
0213         skb_put(skb_aggr, pad);
0214
0215         skb_src = skb_peek(&pra_list->skb_head);
0216
0217     } while (skb_src);
0218
0219     spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0220
0221     /* Last AMSDU packet does not need padding */
0222     skb_trim(skb_aggr, skb_aggr->len - pad);
0223
0224     /* Form AMSDU */
0225     mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
0226     if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
0227         ptx_pd = (struct txpd *)skb_aggr->data;
0228
0229     skb_push(skb_aggr, headroom);
0230     tx_info_aggr->aggr_num = aggr_num * 2;
0231     if (adapter->data_sent || adapter->tx_lock_flag) {
0232         atomic_add(aggr_num * 2, &adapter->tx_queued);
0233         skb_queue_tail(&adapter->tx_data_q, skb_aggr);
0234         return 0;
0235     }
0236
0237     if (skb_src)
0238         tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
0239     else
0240         tx_param.next_pkt_len = 0;
0241
0242     if (adapter->iface_type == MWIFIEX_USB) {
0243         ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
0244                            skb_aggr, &tx_param);
0245     } else {
0246
0247         ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
0248                            skb_aggr, &tx_param);
0249     }
0250     switch (ret) {
0251     case -EBUSY:
0252         spin_lock_bh(&priv->wmm.ra_list_spinlock);
0253         if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
0254             spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0255             mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
0256             return -1;
0257         }
0258         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
0259             adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
0260                 priv->adapter->tx_lock_flag = false;
0261                 if (ptx_pd)
0262                     ptx_pd->flags = 0;
0263         }
0264
0265         skb_queue_tail(&pra_list->skb_head, skb_aggr);
0266
0267         pra_list->total_pkt_count++;
0268
0269         atomic_inc(&priv->wmm.tx_pkts_queued);
0270
0271         tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
0272         spin_unlock_bh(&priv->wmm.ra_list_spinlock);
0273         mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
0274         break;
0275     case -1:
0276         mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
0277                 __func__, ret);
0278         adapter->dbg.num_tx_host_to_card_failure++;
0279         mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
0280         return 0;
0281     case -EINPROGRESS:
0282         break;
0283     case 0:
0284         mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
0285         break;
0286     default:
0287         break;
0288     }
0289     if (ret != -EBUSY) {
0290         mwifiex_rotate_priolists(priv, pra_list, ptrindex);
0291     }
0292
0293     return 0;
0294 }