From 8d98ae6eb0d51f75a7af51758072558ffbb8270f Mon Sep 17 00:00:00 2001 From: Liad Kaufman Date: Tue, 2 Feb 2016 16:02:46 +0200 Subject: [PATCH] iwlwifi: mvm: re-assign old queues after hw restart in dqa mode When working in DQA mode, if a queue is shared and a HW restart occurs, there might be a possible race condition between stations on the queues, and an existing queue might be left with no queues. To solve this, make sure in DQA mode to re-assign the same queues as before the HW restart. Signed-off-by: Liad Kaufman Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 72 +++++++++++++++++++++++++++- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c index 730ba78..1ddcbea 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c @@ -759,8 +759,9 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm, spin_unlock_bh(&mvm->queue_info_lock); /* Disable the queue */ - iwl_mvm_invalidate_sta_queue(mvm, queue, disable_agg_tids, - true); + if (disable_agg_tids) + iwl_mvm_invalidate_sta_queue(mvm, queue, + disable_agg_tids, false); iwl_trans_txq_disable(mvm->trans, queue, false); ret = iwl_mvm_send_cmd_pdu(mvm, SCD_QUEUE_CFG, 0, sizeof(cmd), &cmd); @@ -776,6 +777,10 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm, return ret; } + + /* If TXQ is allocated to another STA, update removal in FW */ + if (cmd.sta_id != mvmsta->sta_id) + iwl_mvm_invalidate_sta_queue(mvm, queue, 0, true); } IWL_DEBUG_TX_QUEUES(mvm, @@ -1072,6 +1077,61 @@ static int iwl_mvm_reserve_sta_stream(struct iwl_mvm *mvm, return 0; } +/* + * In DQA mode, after a HW restart the queues should be allocated as before, in + * order to avoid race conditions when there are shared queues. This function + * does the re-mapping and queue allocation. + * + * Note that re-enabling aggregations isn't done in this function. + */ +static void iwl_mvm_realloc_queues_after_restart(struct iwl_mvm *mvm, + struct iwl_mvm_sta *mvm_sta) +{ + unsigned int wdg_timeout = + iwl_mvm_get_wd_timeout(mvm, mvm_sta->vif, false, false); + int i; + struct iwl_trans_txq_scd_cfg cfg = { + .sta_id = mvm_sta->sta_id, + .frame_limit = IWL_FRAME_LIMIT, + }; + + /* Make sure reserved queue is still marked as such (or allocated) */ + mvm->queue_info[mvm_sta->reserved_queue].status = + IWL_MVM_QUEUE_RESERVED; + + for (i = 0; i <= IWL_MAX_TID_COUNT; i++) { + struct iwl_mvm_tid_data *tid_data = &mvm_sta->tid_data[i]; + int txq_id = tid_data->txq_id; + int ac; + u8 mac_queue; + + if (txq_id == IEEE80211_INVAL_HW_QUEUE) + continue; + + skb_queue_head_init(&tid_data->deferred_tx_frames); + + ac = tid_to_mac80211_ac[i]; + mac_queue = mvm_sta->vif->hw_queue[ac]; + + cfg.tid = i; + cfg.fifo = iwl_mvm_ac_to_tx_fifo[ac]; + cfg.aggregate = (txq_id >= IWL_MVM_DQA_MIN_DATA_QUEUE || + txq_id == IWL_MVM_DQA_BSS_CLIENT_QUEUE); + + IWL_DEBUG_TX_QUEUES(mvm, + "Re-mapping sta %d tid %d to queue %d\n", + mvm_sta->sta_id, i, txq_id); + + iwl_mvm_enable_txq(mvm, txq_id, mac_queue, + IEEE80211_SEQ_TO_SN(tid_data->seq_number), + &cfg, wdg_timeout); + + mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY; + } + + atomic_set(&mvm->pending_frames[mvm_sta->sta_id], 0); +} + int iwl_mvm_add_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif, struct ieee80211_sta *sta) @@ -1094,6 +1154,13 @@ int iwl_mvm_add_sta(struct iwl_mvm *mvm, spin_lock_init(&mvm_sta->lock); + /* In DQA mode, if this is a HW restart, re-alloc existing queues */ + if (iwl_mvm_is_dqa_supported(mvm) && + test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) { + iwl_mvm_realloc_queues_after_restart(mvm, mvm_sta); + goto update_fw; + } + mvm_sta->sta_id = sta_id; mvm_sta->mac_id_n_color = FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color); @@ -1157,6 +1224,7 @@ int iwl_mvm_add_sta(struct iwl_mvm *mvm, goto err; } +update_fw: ret = iwl_mvm_sta_send_to_fw(mvm, sta, false, 0); if (ret) goto err; -- 2.7.4