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Release 4.11 drivers/net/wireless/marvell/mwifiex/11n_aggr.c

/*
 * Marvell Wireless LAN device driver: 802.11n Aggregation
 *
 * Copyright (C) 2011-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "11n_aggr.h"

/*
 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
 *
 * The resultant AMSDU subframe format is -
 *
 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
 * |     DA     |     SA      |   Length   | SNAP header |   MSDU     |
 * | data[0..5] | data[6..11] |            |             | data[14..] |
 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
 *
 * This function also computes the amount of padding required to make the
 * buffer length multiple of 4 bytes.
 *
 * Data => |DA|SA|SNAP-TYPE|........    .|
 * MSDU => |DA|SA|Length|SNAP|......   ..|
 */

static int mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr, struct sk_buff *skb_src, int *pad) { int dt_offset; struct rfc_1042_hdr snap = { 0xaa, /* LLC DSAP */ 0xaa, /* LLC SSAP */ 0x03, /* LLC CTRL */ {0x00, 0x00, 0x00}, /* SNAP OUI */ 0x0000 /* SNAP type */ /* * This field will be overwritten * later with ethertype */ }; struct tx_packet_hdr *tx_header; tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header)); /* Copy DA and SA */ dt_offset = 2 * ETH_ALEN; memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset); /* Copy SNAP header */ snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto; dt_offset += sizeof(__be16); memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr)); skb_pull(skb_src, dt_offset); /* Update Length field */ tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN); /* Add payload */ memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len); /* Add padding for new MSDU to start from 4 byte boundary */ *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4; return skb_aggr->len + *pad; }

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Bing Zhao18889.52%125.00%
Yogesh Ashok Powar178.10%250.00%
Amitkumar Karwar52.38%125.00%
Total210100.00%4100.00%

/* * Adds TxPD to AMSDU header. * * Each AMSDU packet will contain one TxPD at the beginning, * followed by multiple AMSDU subframes. */
static void mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv, struct sk_buff *skb) { struct txpd *local_tx_pd; struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); skb_push(skb, sizeof(*local_tx_pd)); local_tx_pd = (struct txpd *) skb->data; memset(local_tx_pd, 0, sizeof(struct txpd)); /* Original priority has been overwritten */ local_tx_pd->priority = (u8) skb->priority; local_tx_pd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); local_tx_pd->bss_num = priv->bss_num; local_tx_pd->bss_type = priv->bss_type; /* Always zero as the data is followed by struct txpd */ local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU); local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len - sizeof(*local_tx_pd)); if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET; if (local_tx_pd->tx_control == 0) /* TxCtrl set by user or default */ local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && priv->adapter->pps_uapsd_mode) { if (true == mwifiex_check_last_packet_indication(priv)) { priv->adapter->tx_lock_flag = true; local_tx_pd->flags = MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; } } }

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Bing Zhao19789.14%150.00%
Avinash Patil2410.86%150.00%
Total221100.00%2100.00%

/* * Create aggregated packet. * * This function creates an aggregated MSDU packet, by combining buffers * from the RA list. Each individual buffer is encapsulated as an AMSDU * subframe and all such subframes are concatenated together to form the * AMSDU packet. * * A TxPD is also added to the front of the resultant AMSDU packets for * transmission. The resultant packets format is - * * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+ * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame| * | | 1 | 2 | .. | n | * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+ */
int mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv, struct mwifiex_ra_list_tbl *pra_list, int ptrindex, unsigned long ra_list_flags) __releases(&priv->wmm.ra_list_spinlock

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Bing Zhao23100.00%1100.00%
Total23100.00%1100.00%

) { struct mwifiex_adapter *adapter = priv->adapter; struct sk_buff *skb_aggr, *skb_src; struct mwifiex_txinfo *tx_info_aggr, *tx_info_src; int pad = 0, aggr_num = 0, ret; struct mwifiex_tx_param tx_param; struct txpd *ptx_pd = NULL; int headroom = adapter->iface_type == MWIFIEX_USB ? 0 : INTF_HEADER_LEN; skb_src = skb_peek(&pra_list->skb_head); if (!skb_src) { spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); return 0; } tx_info_src = MWIFIEX_SKB_TXCB(skb_src); skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size, GFP_ATOMIC); if (!skb_aggr) { spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); return -1; } /* skb_aggr->data already 64 byte align, just reserve bus interface * header and txpd. */ skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); memset(tx_info_aggr, 0, sizeof(*tx_info_aggr)); tx_info_aggr->bss_type = tx_info_src->bss_type; tx_info_aggr->bss_num = tx_info_src->bss_num; if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT; tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT; skb_aggr->priority = skb_src->priority; skb_aggr->tstamp = skb_src->tstamp; do { /* Check if AMSDU can accommodate this MSDU */ if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) > adapter->tx_buf_size) break; skb_src = skb_dequeue(&pra_list->skb_head); pra_list->total_pkt_count--; atomic_dec(&priv->wmm.tx_pkts_queued); aggr_num++; spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); mwifiex_write_data_complete(adapter, skb_src, 0, 0); spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); return -1; } if (skb_tailroom(skb_aggr) < pad) { pad = 0; break; } skb_put(skb_aggr, pad); skb_src = skb_peek(&pra_list->skb_head); } while (skb_src); spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); /* Last AMSDU packet does not need padding */ skb_trim(skb_aggr, skb_aggr->len - pad); /* Form AMSDU */ mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) ptx_pd = (struct txpd *)skb_aggr->data; skb_push(skb_aggr, headroom); tx_info_aggr->aggr_num = aggr_num * 2; if (adapter->data_sent || adapter->tx_lock_flag) { atomic_add(aggr_num * 2, &adapter->tx_queued); skb_queue_tail(&adapter->tx_data_q, skb_aggr); return 0; } if (adapter->iface_type == MWIFIEX_USB) { ret = adapter->if_ops.host_to_card(adapter, priv->usb_port, skb_aggr, NULL); } else { if (skb_src) tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd); else tx_param.next_pkt_len = 0; ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, skb_aggr, &tx_param); } switch (ret) { case -EBUSY: spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); mwifiex_write_data_complete(adapter, skb_aggr, 1, -1); return -1; } if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && adapter->pps_uapsd_mode && adapter->tx_lock_flag) { priv->adapter->tx_lock_flag = false; if (ptx_pd) ptx_pd->flags = 0; } skb_queue_tail(&pra_list->skb_head, skb_aggr); pra_list->total_pkt_count++; atomic_inc(&priv->wmm.tx_pkts_queued); tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n"); break; case -1: mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n", __func__, ret); adapter->dbg.num_tx_host_to_card_failure++; mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); return 0; case -EINPROGRESS: break; case 0: mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); break; default: break; } if (ret != -EBUSY) { mwifiex_rotate_priolists(priv, pra_list, ptrindex); } return 0; }

Overall Contributors

PersonTokensPropCommitsCommitProp
Bing Zhao96375.12%13.85%
Amitkumar Karwar796.16%519.23%
Zhaoyang Liu745.77%415.38%
Yogesh Ashok Powar705.46%623.08%
Avinash Patil544.21%415.38%
Marc Yang201.56%13.85%
Xinming Hu90.70%27.69%
Cathy Luo80.62%13.85%
Christoph Fritz40.31%13.85%
Andreas Fenkart10.08%13.85%
Total1282100.00%26100.00%
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