--- /dev/null
+/*
+ * 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;
+}
+
+/*
+ * 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);
+ unsigned int pad;
+ int headroom = (priv->adapter->iface_type ==
+ MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
+
+ pad = ((void *)skb->data - sizeof(*local_tx_pd) -
+ headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
+ skb_push(skb, pad);
+
+ 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) +
+ pad);
+ 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) -
+ pad);
+
+ 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;
+ }
+ }
+}
+
+/*
+ * 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)
+{
+ 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;
+ struct timeval tv;
+ 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 | GFP_DMA);
+ 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, MWIFIEX_MIN_DATA_HEADER_LEN);
+ 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;
+
+ do_gettimeofday(&tv);
+ skb_aggr->tstamp = timeval_to_ktime(tv);
+
+ 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);
+ 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) {
+ adapter->data_sent = true;
+ ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
+ 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);
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff