diff options
Diffstat (limited to 'drivers/net/wireless/mwifiex/11n_aggr.c')
| -rw-r--r-- | drivers/net/wireless/mwifiex/11n_aggr.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/11n_aggr.c b/drivers/net/wireless/mwifiex/11n_aggr.c new file mode 100644 index 00000000000..c2abced6695 --- /dev/null +++ b/drivers/net/wireless/mwifiex/11n_aggr.c @@ -0,0 +1,423 @@ +/* + * Marvell Wireless LAN device driver: 802.11n Aggregation + * + * Copyright (C) 2011, 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 mwifiex_adapter *adapter, + 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 = NULL; + + skb_put(skb_aggr, sizeof(*tx_header)); + + tx_header = (struct tx_packet_hdr *) skb_aggr->data; + + /* 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 = *(u16 *) ((u8 *)skb_src->data + dt_offset); + dt_offset += sizeof(u16); + + 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 */ + skb_put(skb_aggr, skb_src->len); + memcpy(skb_aggr->data + sizeof(*tx_header), skb_src->data, + skb_src->len); + *pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len + + LLC_SNAP_LEN)) & 3)) : 0; + skb_put(skb_aggr, *pad); + + return skb_aggr->len + *pad; +} + +/* + * 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; + + 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 (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; + } + } +} + +/* + * Counts the number of subframes in an aggregate packet. + * + * This function parses an aggregate packet buffer, looking for + * subframes and counting the number of such subframe found. The + * function automatically skips the DA/SA fields at the beginning + * of each subframe and padding at the end. + */ +static int +mwifiex_11n_get_num_aggr_pkts(u8 *data, int total_pkt_len) +{ + int pkt_count = 0, pkt_len, pad; + + while (total_pkt_len > 0) { + /* Length will be in network format, change it to host */ + pkt_len = ntohs((*(__be16 *)(data + 2 * ETH_ALEN))); + pad = (((pkt_len + sizeof(struct ethhdr)) & 3)) ? + (4 - ((pkt_len + sizeof(struct ethhdr)) & 3)) : 0; + data += pkt_len + pad + sizeof(struct ethhdr); + total_pkt_len -= pkt_len + pad + sizeof(struct ethhdr); + ++pkt_count; + } + + return pkt_count; +} + +/* + * De-aggregate received packets. + * + * This function parses the received aggregate buffer, extracts each subframe, + * strips off the SNAP header from them and sends the data portion for further + * processing. + * + * Each subframe body is copied onto a separate buffer, which are freed by + * upper layer after processing. The function also performs sanity tests on + * the received buffer. + */ +int mwifiex_11n_deaggregate_pkt(struct mwifiex_private *priv, + struct sk_buff *skb) +{ + u16 pkt_len; + int total_pkt_len; + u8 *data; + int pad; + struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb); + struct rxpd *local_rx_pd = (struct rxpd *) skb->data; + struct sk_buff *skb_daggr; + struct mwifiex_rxinfo *rx_info_daggr = NULL; + int ret = -1; + struct rx_packet_hdr *rx_pkt_hdr; + struct mwifiex_adapter *adapter = priv->adapter; + u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00}; + + data = (u8 *) (local_rx_pd + local_rx_pd->rx_pkt_offset); + total_pkt_len = local_rx_pd->rx_pkt_length; + + /* Sanity test */ + if (total_pkt_len > MWIFIEX_RX_DATA_BUF_SIZE) { + dev_err(adapter->dev, "total pkt len greater than buffer" + " size %d\n", total_pkt_len); + return -1; + } + + rx_info->use_count = mwifiex_11n_get_num_aggr_pkts(data, total_pkt_len); + + while (total_pkt_len > 0) { + rx_pkt_hdr = (struct rx_packet_hdr *) data; + /* Length will be in network format, change it to host */ + pkt_len = ntohs((*(__be16 *) (data + 2 * ETH_ALEN))); + if (pkt_len > total_pkt_len) { + dev_err(adapter->dev, "pkt_len %d > total_pkt_len %d\n", + total_pkt_len, pkt_len); + break; + } + + pad = (((pkt_len + sizeof(struct ethhdr)) & 3)) ? + (4 - ((pkt_len + sizeof(struct ethhdr)) & 3)) : 0; + + total_pkt_len -= pkt_len + pad + sizeof(struct ethhdr); + + if (memcmp(&rx_pkt_hdr->rfc1042_hdr, + rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) { + memmove(data + LLC_SNAP_LEN, data, 2 * ETH_ALEN); + data += LLC_SNAP_LEN; + pkt_len += sizeof(struct ethhdr) - LLC_SNAP_LEN; + } else { + *(u16 *) (data + 2 * ETH_ALEN) = (u16) 0; + pkt_len += sizeof(struct ethhdr); + } + + skb_daggr = dev_alloc_skb(pkt_len); + if (!skb_daggr) { + dev_err(adapter->dev, "%s: failed to alloc skb_daggr\n", + __func__); + return -1; + } + rx_info_daggr = MWIFIEX_SKB_RXCB(skb_daggr); + + rx_info_daggr->bss_index = rx_info->bss_index; + skb_daggr->tstamp = skb->tstamp; + rx_info_daggr->parent = skb; + skb_daggr->priority = skb->priority; + skb_put(skb_daggr, pkt_len); + memcpy(skb_daggr->data, data, pkt_len); + + ret = mwifiex_recv_packet(adapter, skb_daggr); + + switch (ret) { + case -EINPROGRESS: + break; + case -1: + dev_err(adapter->dev, "deaggr: host_to_card failed\n"); + case 0: + mwifiex_recv_packet_complete(adapter, skb_daggr, ret); + break; + default: + break; + } + + data += pkt_len + pad; + } + + return ret; +} + +/* + * 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 headroom, + int ptrindex, unsigned long ra_list_flags) + __releases(&priv->wmm.ra_list_spinlock) +{ + 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; + int ret = 0; + struct mwifiex_tx_param tx_param; + struct txpd *ptx_pd = NULL; + + if (skb_queue_empty(&pra_list->skb_head)) { + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, + ra_list_flags); + return 0; + } + skb_src = skb_peek(&pra_list->skb_head); + tx_info_src = MWIFIEX_SKB_TXCB(skb_src); + skb_aggr = dev_alloc_skb(adapter->tx_buf_size); + if (!skb_aggr) { + dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__); + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, + ra_list_flags); + return -1; + } + skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); + tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); + + tx_info_aggr->bss_index = tx_info_src->bss_index; + skb_aggr->priority = skb_src->priority; + + while (skb_src && ((skb_headroom(skb_aggr) + skb_src->len + + LLC_SNAP_LEN) + <= adapter->tx_buf_size)) { + + if (!skb_queue_empty(&pra_list->skb_head)) + skb_src = skb_dequeue(&pra_list->skb_head); + else + skb_src = NULL; + + pra_list->total_pkts_size -= skb_src->len; + + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, + ra_list_flags); + mwifiex_11n_form_amsdu_pkt(adapter, skb_aggr, skb_src, &pad); + + mwifiex_write_data_complete(adapter, skb_src, 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_queue_empty(&pra_list->skb_head)) + skb_src = skb_peek(&pra_list->skb_head); + else + skb_src = NULL; + } + + 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_param.next_pkt_len = ((pra_list->total_pkts_size) ? + (((pra_list->total_pkts_size) > + adapter->tx_buf_size) ? adapter-> + tx_buf_size : pra_list->total_pkts_size + + LLC_SNAP_LEN + sizeof(struct txpd)) : 0); + ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, + skb_aggr->data, + skb_aggr->len, &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); + 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; + ptx_pd->flags = 0; + } + + skb_queue_tail(&pra_list->skb_head, skb_aggr); + + pra_list->total_pkts_size += skb_aggr->len; + + tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, + ra_list_flags); + dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); + break; + case -1: + adapter->data_sent = false; + dev_err(adapter->dev, "%s: host_to_card failed: %#x\n", + __func__, ret); + adapter->dbg.num_tx_host_to_card_failure++; + mwifiex_write_data_complete(adapter, skb_aggr, ret); + return 0; + case -EINPROGRESS: + adapter->data_sent = false; + break; + case 0: + mwifiex_write_data_complete(adapter, skb_aggr, ret); + break; + default: + break; + } + if (ret != -EBUSY) { + spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); + if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { + priv->wmm.packets_out[ptrindex]++; + priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list; + } + /* Now bss_prio_cur pointer points to next node */ + adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur = + list_first_entry( + &adapter->bss_prio_tbl[priv->bss_priority] + .bss_prio_cur->list, + struct mwifiex_bss_prio_node, list); + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, + ra_list_flags); + } + + return 0; +} |