From 24afba7690e49714795a1e8ee25e617ea0fb566b Mon Sep 17 00:00:00 2001 From: Liad Kaufman Date: Tue, 28 Jul 2015 18:56:08 +0300 Subject: iwlwifi: mvm: support bss dynamic alloc/dealloc of queues "DQA" is shorthand for "dynamic queue allocation". This enables on-demand allocation of queues per RA/TID rather than statically allocating per vif, thus allowing a potential benefit of various factors. Please refer to the DOC section this patch adds to sta.h to see a more in-depth explanation of this feature. There are many things to take into consideration when working in DQA mode, and this patch is only one in a series. Note that default operation mode is non-DQA mode, unless the FW indicates that it supports DQA mode. This patch enables support of DQA for a station connected to an AP, and works in a non-aggregated mode. When a frame for an unused RA/TID arrives at the driver, it isn't TXed immediately, but deferred first until a suitable queue is first allocated for it, and then TXed by a worker that both allocates the queues and TXes deferred traffic. When a STA is removed, its queues goes back into the queue pools for reuse as needed. Signed-off-by: Liad Kaufman Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) (limited to 'drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c') diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c index e885db3464b0..c02c1055d534 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c @@ -425,12 +425,17 @@ static int iwl_mvm_mac_ctxt_allocate_resources(struct iwl_mvm *mvm, return 0; } - /* Find available queues, and allocate them to the ACs */ + /* + * Find available queues, and allocate them to the ACs. When in + * DQA-mode they aren't really used, and this is done only so the + * mac80211 ieee80211_check_queues() function won't fail + */ for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { u8 queue = find_first_zero_bit(&used_hw_queues, mvm->first_agg_queue); - if (queue >= mvm->first_agg_queue) { + if (!iwl_mvm_is_dqa_supported(mvm) && + queue >= mvm->first_agg_queue) { IWL_ERR(mvm, "Failed to allocate queue\n"); ret = -EIO; goto exit_fail; @@ -495,6 +500,10 @@ int iwl_mvm_mac_ctxt_init(struct iwl_mvm *mvm, struct ieee80211_vif *vif) IWL_MVM_TX_FIFO_MCAST, 0, wdg_timeout); /* fall through */ default: + /* If DQA is supported - queues will be enabled when needed */ + if (iwl_mvm_is_dqa_supported(mvm)) + break; + for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) iwl_mvm_enable_ac_txq(mvm, vif->hw_queue[ac], vif->hw_queue[ac], @@ -523,6 +532,14 @@ void iwl_mvm_mac_ctxt_release(struct iwl_mvm *mvm, struct ieee80211_vif *vif) IWL_MAX_TID_COUNT, 0); /* fall through */ default: + /* + * If DQA is supported - queues were already disabled, since in + * DQA-mode the queues are a property of the STA and not of the + * vif, and at this point the STA was already deleted + */ + if (iwl_mvm_is_dqa_supported(mvm)) + break; + for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) iwl_mvm_disable_txq(mvm, vif->hw_queue[ac], vif->hw_queue[ac], -- cgit