1 files changed, 298 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..d3d5e0853c45
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -0,0 +1,298 @@
+/*
+ * 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;
+
+		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;
+
+		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;
+}