From: Johannes Berg johannes.berg@intel.com
[ Upstream commit c6ce1c74ef2923b8ffd85f7f8b486f804f343b39 ]
When TVQM is enabled (iwl_mvm_has_new_tx_api() is true), then queue numbers are just sequentially assigned 0, 1, 2, ... Prior to TVQM, in DQA, there were some statically allocated queue numbers: * IWL_MVM_DQA_AUX_QUEUE == 1, * both IWL_MVM_DQA_INJECT_MONITOR_QUEUE and IWL_MVM_DQA_P2P_DEVICE_QUEUE == 2, and * IWL_MVM_DQA_AP_PROBE_RESP_QUEUE == 9.
Now, these values are assigned to the members mvm->aux_queue, mvm->snif_queue, mvm->probe_queue and mvm->p2p_dev_queue by default. Normally, this doesn't really matter, and if TVQM is in fact available we override them to the real values after allocating a queue for use there.
However, this allocation doesn't always happen. For example, for mvm->p2p_dev_queue (== 2) it only happens when the P2P Device interface is started, if any. If it's not started, the value in mvm->p2p_dev_queue remains 2. This wouldn't really matter all that much if it weren't for iwl_mvm_is_static_queue() which checks a queue number against one of those four static numbers.
Now, if no P2P Device or monitor interface is added then queue 2 may be dynamically allocated, yet alias mvm->p2p_dev_queue or mvm->snif_queue, and thus iwl_mvm_is_static_queue() erroneously returns true for it. If it then gets full, all interface queues are stopped, instead of just backpressuring against the one TXQ that's really the only affected one.
This clearly can lead to issues, as everything is stopped even if just a single TXQ filled its corresponding HW queue, if it happens to have an appropriate number (2 or 9, AUX is always reassigned.) Due to a mac80211 bug, this also led to a situation in which the queues remained stopped across a deauthentication and then attempts to connect to a new AP started failing, but that's fixed separately.
Fix all of this by simply initializing the queue numbers to the invalid value until they're used, if TVQM is enabled, and also setting them back to that value when the queues are later freed again.
Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Link: https://lore.kernel.org/r/iwlwifi.20210802172232.2e47e623f9e2.I9b0830dafbb68... Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/intel/iwlwifi/mvm/ops.c | 24 +++++++++++++--- drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 30 ++++++++++++-------- 2 files changed, 38 insertions(+), 16 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c index 8b0576cde797..a9aab6c690e8 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c @@ -687,10 +687,26 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
mvm->fw_restart = iwlwifi_mod_params.fw_restart ? -1 : 0;
- mvm->aux_queue = IWL_MVM_DQA_AUX_QUEUE; - mvm->snif_queue = IWL_MVM_DQA_INJECT_MONITOR_QUEUE; - mvm->probe_queue = IWL_MVM_DQA_AP_PROBE_RESP_QUEUE; - mvm->p2p_dev_queue = IWL_MVM_DQA_P2P_DEVICE_QUEUE; + if (iwl_mvm_has_new_tx_api(mvm)) { + /* + * If we have the new TX/queue allocation API initialize them + * all to invalid numbers. We'll rewrite the ones that we need + * later, but that doesn't happen for all of them all of the + * time (e.g. P2P Device is optional), and if a dynamic queue + * ends up getting number 2 (IWL_MVM_DQA_P2P_DEVICE_QUEUE) then + * iwl_mvm_is_static_queue() erroneously returns true, and we + * might have things getting stuck. + */ + mvm->aux_queue = IWL_MVM_INVALID_QUEUE; + mvm->snif_queue = IWL_MVM_INVALID_QUEUE; + mvm->probe_queue = IWL_MVM_INVALID_QUEUE; + mvm->p2p_dev_queue = IWL_MVM_INVALID_QUEUE; + } else { + mvm->aux_queue = IWL_MVM_DQA_AUX_QUEUE; + mvm->snif_queue = IWL_MVM_DQA_INJECT_MONITOR_QUEUE; + mvm->probe_queue = IWL_MVM_DQA_AP_PROBE_RESP_QUEUE; + mvm->p2p_dev_queue = IWL_MVM_DQA_P2P_DEVICE_QUEUE; + }
mvm->sf_state = SF_UNINIT; if (iwl_mvm_has_unified_ucode(mvm)) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c index 40cafcf40ccf..5df4bbb6c6de 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c @@ -346,8 +346,9 @@ static int iwl_mvm_invalidate_sta_queue(struct iwl_mvm *mvm, int queue, }
static int iwl_mvm_disable_txq(struct iwl_mvm *mvm, struct ieee80211_sta *sta, - int queue, u8 tid, u8 flags) + u16 *queueptr, u8 tid, u8 flags) { + int queue = *queueptr; struct iwl_scd_txq_cfg_cmd cmd = { .scd_queue = queue, .action = SCD_CFG_DISABLE_QUEUE, @@ -356,6 +357,7 @@ static int iwl_mvm_disable_txq(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
if (iwl_mvm_has_new_tx_api(mvm)) { iwl_trans_txq_free(mvm->trans, queue); + *queueptr = IWL_MVM_INVALID_QUEUE;
return 0; } @@ -517,6 +519,7 @@ static int iwl_mvm_free_inactive_queue(struct iwl_mvm *mvm, int queue, u8 sta_id, tid; unsigned long disable_agg_tids = 0; bool same_sta; + u16 queue_tmp = queue; int ret;
lockdep_assert_held(&mvm->mutex); @@ -539,7 +542,7 @@ static int iwl_mvm_free_inactive_queue(struct iwl_mvm *mvm, int queue, iwl_mvm_invalidate_sta_queue(mvm, queue, disable_agg_tids, false);
- ret = iwl_mvm_disable_txq(mvm, old_sta, queue, tid, 0); + ret = iwl_mvm_disable_txq(mvm, old_sta, &queue_tmp, tid, 0); if (ret) { IWL_ERR(mvm, "Failed to free inactive queue %d (ret=%d)\n", @@ -1209,6 +1212,7 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm, unsigned int wdg_timeout = iwl_mvm_get_wd_timeout(mvm, mvmsta->vif, false, false); int queue = -1; + u16 queue_tmp; unsigned long disable_agg_tids = 0; enum iwl_mvm_agg_state queue_state; bool shared_queue = false, inc_ssn; @@ -1357,7 +1361,8 @@ static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm, return 0;
out_err: - iwl_mvm_disable_txq(mvm, sta, queue, tid, 0); + queue_tmp = queue; + iwl_mvm_disable_txq(mvm, sta, &queue_tmp, tid, 0);
return ret; } @@ -1795,7 +1800,7 @@ static void iwl_mvm_disable_sta_queues(struct iwl_mvm *mvm, if (mvm_sta->tid_data[i].txq_id == IWL_MVM_INVALID_QUEUE) continue;
- iwl_mvm_disable_txq(mvm, sta, mvm_sta->tid_data[i].txq_id, i, + iwl_mvm_disable_txq(mvm, sta, &mvm_sta->tid_data[i].txq_id, i, 0); mvm_sta->tid_data[i].txq_id = IWL_MVM_INVALID_QUEUE; } @@ -2005,7 +2010,7 @@ static int iwl_mvm_add_int_sta_with_queue(struct iwl_mvm *mvm, int macidx, ret = iwl_mvm_add_int_sta_common(mvm, sta, NULL, macidx, maccolor); if (ret) { if (!iwl_mvm_has_new_tx_api(mvm)) - iwl_mvm_disable_txq(mvm, NULL, *queue, + iwl_mvm_disable_txq(mvm, NULL, queue, IWL_MAX_TID_COUNT, 0); return ret; } @@ -2073,7 +2078,7 @@ int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif) if (WARN_ON_ONCE(mvm->snif_sta.sta_id == IWL_MVM_INVALID_STA)) return -EINVAL;
- iwl_mvm_disable_txq(mvm, NULL, mvm->snif_queue, IWL_MAX_TID_COUNT, 0); + iwl_mvm_disable_txq(mvm, NULL, &mvm->snif_queue, IWL_MAX_TID_COUNT, 0); ret = iwl_mvm_rm_sta_common(mvm, mvm->snif_sta.sta_id); if (ret) IWL_WARN(mvm, "Failed sending remove station\n"); @@ -2090,7 +2095,7 @@ int iwl_mvm_rm_aux_sta(struct iwl_mvm *mvm) if (WARN_ON_ONCE(mvm->aux_sta.sta_id == IWL_MVM_INVALID_STA)) return -EINVAL;
- iwl_mvm_disable_txq(mvm, NULL, mvm->aux_queue, IWL_MAX_TID_COUNT, 0); + iwl_mvm_disable_txq(mvm, NULL, &mvm->aux_queue, IWL_MAX_TID_COUNT, 0); ret = iwl_mvm_rm_sta_common(mvm, mvm->aux_sta.sta_id); if (ret) IWL_WARN(mvm, "Failed sending remove station\n"); @@ -2186,7 +2191,7 @@ static void iwl_mvm_free_bcast_sta_queues(struct iwl_mvm *mvm, struct ieee80211_vif *vif) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); - int queue; + u16 *queueptr, queue;
lockdep_assert_held(&mvm->mutex);
@@ -2195,10 +2200,10 @@ static void iwl_mvm_free_bcast_sta_queues(struct iwl_mvm *mvm, switch (vif->type) { case NL80211_IFTYPE_AP: case NL80211_IFTYPE_ADHOC: - queue = mvm->probe_queue; + queueptr = &mvm->probe_queue; break; case NL80211_IFTYPE_P2P_DEVICE: - queue = mvm->p2p_dev_queue; + queueptr = &mvm->p2p_dev_queue; break; default: WARN(1, "Can't free bcast queue on vif type %d\n", @@ -2206,7 +2211,8 @@ static void iwl_mvm_free_bcast_sta_queues(struct iwl_mvm *mvm, return; }
- iwl_mvm_disable_txq(mvm, NULL, queue, IWL_MAX_TID_COUNT, 0); + queue = *queueptr; + iwl_mvm_disable_txq(mvm, NULL, queueptr, IWL_MAX_TID_COUNT, 0); if (iwl_mvm_has_new_tx_api(mvm)) return;
@@ -2441,7 +2447,7 @@ int iwl_mvm_rm_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
iwl_mvm_flush_sta(mvm, &mvmvif->mcast_sta, true, 0);
- iwl_mvm_disable_txq(mvm, NULL, mvmvif->cab_queue, 0, 0); + iwl_mvm_disable_txq(mvm, NULL, &mvmvif->cab_queue, 0, 0);
ret = iwl_mvm_rm_sta_common(mvm, mvmvif->mcast_sta.sta_id); if (ret)