1 files changed, 302 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 000000000000..f807447e4d99
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -0,0 +1,302 @@
+/*
+ * 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;
+
+        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;
+                }
+        }
+}
+
+/*
+ * 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;
+
+        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;
+
+                if (skb_src)
+                        pra_list->total_pkts_size -= skb_src->len;
+
+                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);
+
+                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;
+                                if (ptx_pd)
+                                        ptx_pd->flags = 0;
+                }
+
+                skb_queue_tail(&pra_list->skb_head, skb_aggr);
+
+                pra_list->total_pkts_size += skb_aggr->len;
+
+                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:
+                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;
+}