| /* |
| * 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 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 = *(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 */ |
| 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; |
| } |
| |
| /* |
| * 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; |
| } |
| } |
| } |
| |
| /* |
| * 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, ret; |
| struct mwifiex_tx_param tx_param; |
| struct txpd *ptx_pd = NULL; |
| |
| 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 = 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_type = tx_info_src->bss_type; |
| tx_info_aggr->bss_num = tx_info_src->bss_num; |
| skb_aggr->priority = skb_src->priority; |
| |
| do { |
| /* Check if AMSDU can accommodate this MSDU */ |
| if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN)) |
| break; |
| |
| skb_src = skb_dequeue(&pra_list->skb_head); |
| |
| pra_list->total_pkt_count--; |
| |
| atomic_dec(&priv->wmm.tx_pkts_queued); |
| |
| 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); |
| |
| if (adapter->iface_type == MWIFIEX_USB) { |
| adapter->data_sent = true; |
| ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA, |
| skb_aggr, NULL); |
| } else { |
| /* |
| * Padding per MSDU will affect the length of next |
| * packet and hence the exact length of next packet |
| * is uncertain here. |
| * |
| * Also, aggregation of transmission buffer, while |
| * downloading the data to the card, wont gain much |
| * on the AMSDU packets as the AMSDU packets utilizes |
| * the transmission buffer space to the maximum |
| * (adapter->tx_buf_size). |
| */ |
| 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); |
| dev_dbg(adapter->dev, "data: -EBUSY is returned\n"); |
| break; |
| case -1: |
| if (adapter->iface_type != MWIFIEX_PCIE) |
| 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, 1, ret); |
| return 0; |
| case -EINPROGRESS: |
| if (adapter->iface_type != MWIFIEX_PCIE) |
| adapter->data_sent = false; |
| 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; |
| } |