From 56bd24a18e1a7306a21f6b7d7716cced7e593057 Mon Sep 17 00:00:00 2001 From: Avinash Patil Date: Fri, 7 Feb 2014 16:30:35 -0800 Subject: [PATCH] mwifiex: provision for holding and restoring packets during TDLS setup While TDLS link is being setup, few packets from this station to peer station may be buffered at AP. It may happen that once TDLS link is setup, packets sent from station to peer on direct link get delivered before traffic from AP arrives at peer station. This results into packet reordering issue at peer station. To avoid this, we hold data packets destined to TDLS peer during TDLS setup. These packets are moved to temperory TDLS TX queue. Upon successful TDLS setup, they are moved to RA list created for this peer. Upon failure, packets are moved back to AP's RA list for that particular TID. Signed-off-by: Avinash Patil Signed-off-by: Bing Zhao Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/init.c | 1 + drivers/net/wireless/mwifiex/main.h | 1 + drivers/net/wireless/mwifiex/tdls.c | 94 +++++++++++++++++++++++++++++ drivers/net/wireless/mwifiex/wmm.c | 4 ++ 4 files changed, 100 insertions(+) diff --git a/drivers/net/wireless/mwifiex/init.c b/drivers/net/wireless/mwifiex/init.c index dead65960d34..9dc8059778a0 100644 --- a/drivers/net/wireless/mwifiex/init.c +++ b/drivers/net/wireless/mwifiex/init.c @@ -452,6 +452,7 @@ int mwifiex_init_lock_list(struct mwifiex_adapter *adapter) INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr); INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr); INIT_LIST_HEAD(&priv->sta_list); + skb_queue_head_init(&priv->tdls_txq); spin_lock_init(&priv->tx_ba_stream_tbl_lock); spin_lock_init(&priv->rx_reorder_tbl_lock); diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h index c8c30a4c9a73..bce65f5f0046 100644 --- a/drivers/net/wireless/mwifiex/main.h +++ b/drivers/net/wireless/mwifiex/main.h @@ -530,6 +530,7 @@ struct mwifiex_private { u8 del_list_idx; bool hs2_enabled; struct station_parameters *sta_params; + struct sk_buff_head tdls_txq; }; enum mwifiex_ba_status { diff --git a/drivers/net/wireless/mwifiex/tdls.c b/drivers/net/wireless/mwifiex/tdls.c index f37862b5fabb..3198739c133e 100644 --- a/drivers/net/wireless/mwifiex/tdls.c +++ b/drivers/net/wireless/mwifiex/tdls.c @@ -24,6 +24,96 @@ #define TDLS_RESP_FIX_LEN 8 #define TDLS_CONFIRM_FIX_LEN 6 +static void +mwifiex_restore_tdls_packets(struct mwifiex_private *priv, u8 *mac, u8 status) +{ + struct mwifiex_ra_list_tbl *ra_list; + struct list_head *tid_list; + struct sk_buff *skb, *tmp; + struct mwifiex_txinfo *tx_info; + unsigned long flags; + u32 tid; + u8 tid_down; + + dev_dbg(priv->adapter->dev, "%s: %pM\n", __func__, mac); + spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); + + skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) { + if (!ether_addr_equal(mac, skb->data)) + continue; + + __skb_unlink(skb, &priv->tdls_txq); + tx_info = MWIFIEX_SKB_TXCB(skb); + tid = skb->priority; + tid_down = mwifiex_wmm_downgrade_tid(priv, tid); + + if (status == TDLS_SETUP_COMPLETE) { + ra_list = mwifiex_wmm_get_queue_raptr(priv, tid, mac); + tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT; + } else { + tid_list = &priv->wmm.tid_tbl_ptr[tid_down].ra_list; + if (!list_empty(tid_list)) + ra_list = list_first_entry(tid_list, + struct mwifiex_ra_list_tbl, list); + else + ra_list = NULL; + tx_info->flags &= ~MWIFIEX_BUF_FLAG_TDLS_PKT; + } + + if (!ra_list) { + mwifiex_write_data_complete(priv->adapter, skb, 0, -1); + continue; + } + + skb_queue_tail(&ra_list->skb_head, skb); + + ra_list->ba_pkt_count++; + ra_list->total_pkt_count++; + + if (atomic_read(&priv->wmm.highest_queued_prio) < + tos_to_tid_inv[tid_down]) + atomic_set(&priv->wmm.highest_queued_prio, + tos_to_tid_inv[tid_down]); + + atomic_inc(&priv->wmm.tx_pkts_queued); + } + + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); + return; +} + +static void mwifiex_hold_tdls_packets(struct mwifiex_private *priv, u8 *mac) +{ + struct mwifiex_ra_list_tbl *ra_list; + struct list_head *ra_list_head; + struct sk_buff *skb, *tmp; + unsigned long flags; + int i; + + dev_dbg(priv->adapter->dev, "%s: %pM\n", __func__, mac); + spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); + + for (i = 0; i < MAX_NUM_TID; i++) { + if (!list_empty(&priv->wmm.tid_tbl_ptr[i].ra_list)) { + ra_list_head = &priv->wmm.tid_tbl_ptr[i].ra_list; + list_for_each_entry(ra_list, ra_list_head, list) { + skb_queue_walk_safe(&ra_list->skb_head, skb, + tmp) { + if (!ether_addr_equal(mac, skb->data)) + continue; + __skb_unlink(skb, &ra_list->skb_head); + atomic_dec(&priv->wmm.tx_pkts_queued); + ra_list->total_pkt_count--; + skb_queue_tail(&priv->tdls_txq, skb); + } + } + } + } + + spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); + return; +} + /* This function appends rate TLV to scan config command. */ static int mwifiex_tdls_append_rates_ie(struct mwifiex_private *priv, @@ -584,6 +674,7 @@ mwifiex_tdls_process_create_link(struct mwifiex_private *priv, u8 *peer) return -ENOMEM; sta_ptr->tdls_status = TDLS_SETUP_INPROGRESS; + mwifiex_hold_tdls_packets(priv, peer); memcpy(&tdls_oper.peer_mac, peer, ETH_ALEN); tdls_oper.tdls_action = MWIFIEX_TDLS_CREATE_LINK; return mwifiex_send_cmd_sync(priv, HostCmd_CMD_TDLS_OPER, @@ -612,6 +703,7 @@ mwifiex_tdls_process_disable_link(struct mwifiex_private *priv, u8 *peer) mwifiex_del_sta_entry(priv, peer); } + mwifiex_restore_tdls_packets(priv, peer, TDLS_LINK_TEARDOWN); memcpy(&tdls_oper.peer_mac, peer, ETH_ALEN); tdls_oper.tdls_action = MWIFIEX_TDLS_DISABLE_LINK; return mwifiex_send_cmd_sync(priv, HostCmd_CMD_TDLS_OPER, @@ -655,6 +747,7 @@ mwifiex_tdls_process_enable_link(struct mwifiex_private *priv, u8 *peer) } memset(sta_ptr->rx_seq, 0xff, sizeof(sta_ptr->rx_seq)); + mwifiex_restore_tdls_packets(priv, peer, TDLS_SETUP_COMPLETE); } else { dev_dbg(priv->adapter->dev, "tdls: enable link %pM failed\n", peer); @@ -667,6 +760,7 @@ mwifiex_tdls_process_enable_link(struct mwifiex_private *priv, u8 *peer) flags); mwifiex_del_sta_entry(priv, peer); } + mwifiex_restore_tdls_packets(priv, peer, TDLS_LINK_TEARDOWN); return -1; } diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c index 557d36318d1d..e9f7628684ce 100644 --- a/drivers/net/wireless/mwifiex/wmm.c +++ b/drivers/net/wireless/mwifiex/wmm.c @@ -533,6 +533,7 @@ void mwifiex_clean_txrx(struct mwifiex_private *priv) { unsigned long flags; + struct sk_buff *skb, *tmp; mwifiex_11n_cleanup_reorder_tbl(priv); spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); @@ -549,6 +550,9 @@ mwifiex_clean_txrx(struct mwifiex_private *priv) if (priv->adapter->if_ops.clean_pcie_ring) priv->adapter->if_ops.clean_pcie_ring(priv->adapter); spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); + + skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) + mwifiex_write_data_complete(priv->adapter, skb, 0, -1); } /* -- 2.20.1