295 lines
8.2 KiB
C
295 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* NXP Wireless LAN device driver: 802.11n Aggregation
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*
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* Copyright 2011-2020 NXP
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*/
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#include "decl.h"
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#include "ioctl.h"
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#include "util.h"
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#include "fw.h"
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#include "main.h"
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#include "wmm.h"
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#include "11n.h"
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#include "11n_aggr.h"
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/*
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* Creates an AMSDU subframe for aggregation into one AMSDU packet.
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*
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* The resultant AMSDU subframe format is -
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*
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* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
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* | DA | SA | Length | SNAP header | MSDU |
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* | data[0..5] | data[6..11] | | | data[14..] |
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* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
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* <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
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*
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* This function also computes the amount of padding required to make the
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* buffer length multiple of 4 bytes.
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*
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* Data => |DA|SA|SNAP-TYPE|........ .|
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* MSDU => |DA|SA|Length|SNAP|...... ..|
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*/
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static int
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mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
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struct sk_buff *skb_src, int *pad)
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{
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int dt_offset;
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struct rfc_1042_hdr snap = {
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0xaa, /* LLC DSAP */
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0xaa, /* LLC SSAP */
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0x03, /* LLC CTRL */
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{0x00, 0x00, 0x00}, /* SNAP OUI */
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0x0000 /* SNAP type */
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/*
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* This field will be overwritten
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* later with ethertype
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*/
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};
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struct tx_packet_hdr *tx_header;
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tx_header = skb_put(skb_aggr, sizeof(*tx_header));
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/* Copy DA and SA */
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dt_offset = 2 * ETH_ALEN;
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memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
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/* Copy SNAP header */
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snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
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dt_offset += sizeof(__be16);
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memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
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skb_pull(skb_src, dt_offset);
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/* Update Length field */
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tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
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/* Add payload */
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skb_put_data(skb_aggr, skb_src->data, skb_src->len);
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/* Add padding for new MSDU to start from 4 byte boundary */
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*pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
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return skb_aggr->len + *pad;
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}
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/*
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* Adds TxPD to AMSDU header.
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*
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* Each AMSDU packet will contain one TxPD at the beginning,
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* followed by multiple AMSDU subframes.
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*/
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static void
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mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct txpd *local_tx_pd;
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struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
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skb_push(skb, sizeof(*local_tx_pd));
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local_tx_pd = (struct txpd *) skb->data;
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memset(local_tx_pd, 0, sizeof(struct txpd));
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/* Original priority has been overwritten */
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local_tx_pd->priority = (u8) skb->priority;
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local_tx_pd->pkt_delay_2ms =
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mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
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local_tx_pd->bss_num = priv->bss_num;
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local_tx_pd->bss_type = priv->bss_type;
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/* Always zero as the data is followed by struct txpd */
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local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
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local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
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local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
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sizeof(*local_tx_pd));
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if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
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local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
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if (local_tx_pd->tx_control == 0)
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/* TxCtrl set by user or default */
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local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
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priv->adapter->pps_uapsd_mode) {
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if (true == mwifiex_check_last_packet_indication(priv)) {
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priv->adapter->tx_lock_flag = true;
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local_tx_pd->flags =
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MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
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}
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}
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}
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/*
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* Create aggregated packet.
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*
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* This function creates an aggregated MSDU packet, by combining buffers
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* from the RA list. Each individual buffer is encapsulated as an AMSDU
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* subframe and all such subframes are concatenated together to form the
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* AMSDU packet.
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*
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* A TxPD is also added to the front of the resultant AMSDU packets for
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* transmission. The resultant packets format is -
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*
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* +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
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* | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
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* | | 1 | 2 | .. | n |
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* +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
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*/
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int
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mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
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struct mwifiex_ra_list_tbl *pra_list,
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int ptrindex)
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__releases(&priv->wmm.ra_list_spinlock)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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struct sk_buff *skb_aggr, *skb_src;
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struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
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int pad = 0, aggr_num = 0, ret;
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struct mwifiex_tx_param tx_param;
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struct txpd *ptx_pd = NULL;
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int headroom = adapter->intf_hdr_len;
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skb_src = skb_peek(&pra_list->skb_head);
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if (!skb_src) {
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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return 0;
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}
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tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
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skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
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GFP_ATOMIC);
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if (!skb_aggr) {
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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return -1;
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}
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/* skb_aggr->data already 64 byte align, just reserve bus interface
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* header and txpd.
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*/
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skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
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tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
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memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
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tx_info_aggr->bss_type = tx_info_src->bss_type;
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tx_info_aggr->bss_num = tx_info_src->bss_num;
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if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
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tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
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tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
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skb_aggr->priority = skb_src->priority;
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skb_aggr->tstamp = skb_src->tstamp;
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do {
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/* Check if AMSDU can accommodate this MSDU */
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if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
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adapter->tx_buf_size)
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break;
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skb_src = skb_dequeue(&pra_list->skb_head);
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pra_list->total_pkt_count--;
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atomic_dec(&priv->wmm.tx_pkts_queued);
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aggr_num++;
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
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mwifiex_write_data_complete(adapter, skb_src, 0, 0);
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spin_lock_bh(&priv->wmm.ra_list_spinlock);
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if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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return -1;
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}
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if (skb_tailroom(skb_aggr) < pad) {
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pad = 0;
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break;
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}
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skb_put(skb_aggr, pad);
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skb_src = skb_peek(&pra_list->skb_head);
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} while (skb_src);
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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/* Last AMSDU packet does not need padding */
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skb_trim(skb_aggr, skb_aggr->len - pad);
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/* Form AMSDU */
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mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
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ptx_pd = (struct txpd *)skb_aggr->data;
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skb_push(skb_aggr, headroom);
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tx_info_aggr->aggr_num = aggr_num * 2;
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if (adapter->data_sent || adapter->tx_lock_flag) {
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atomic_add(aggr_num * 2, &adapter->tx_queued);
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skb_queue_tail(&adapter->tx_data_q, skb_aggr);
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return 0;
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}
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if (skb_src)
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tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
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else
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tx_param.next_pkt_len = 0;
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if (adapter->iface_type == MWIFIEX_USB) {
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ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
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skb_aggr, &tx_param);
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} else {
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ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
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skb_aggr, &tx_param);
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}
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switch (ret) {
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case -EBUSY:
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spin_lock_bh(&priv->wmm.ra_list_spinlock);
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if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
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return -1;
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}
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
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adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
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priv->adapter->tx_lock_flag = false;
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if (ptx_pd)
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ptx_pd->flags = 0;
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}
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skb_queue_tail(&pra_list->skb_head, skb_aggr);
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pra_list->total_pkt_count++;
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atomic_inc(&priv->wmm.tx_pkts_queued);
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tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
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spin_unlock_bh(&priv->wmm.ra_list_spinlock);
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mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
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break;
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case -1:
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mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
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__func__, ret);
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adapter->dbg.num_tx_host_to_card_failure++;
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mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
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return 0;
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case -EINPROGRESS:
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break;
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case 0:
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mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
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break;
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default:
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break;
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}
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if (ret != -EBUSY) {
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mwifiex_rotate_priolists(priv, pra_list, ptrindex);
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}
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return 0;
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}
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