From: Liad Kaufman <liad.kaufman@xxxxxxxxx>
Every active TXQ is assigned to a TID given through the
SCD_CONFIG_CMD, and acts as an identifier in the FW. However,
there may be cases this ownership needs to be changed.
For example, in the following scenario:
1. TID x is owner of a queue
2. Due to a shortage of queues, TID y and z share with x
3. TID x becomes inactive and needs to be removed from the
shared queue.
In this scenario, if another queue is freed and traffic on x
continues, we can't allocate it a new queue as long as it is
the owner of the first queue.
Support moving ownership of a TXQ to a different TID (same
STA) without stopping the queue.
Signed-off-by: Liad Kaufman <liad.kaufman@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
drivers/net/wireless/intel/iwlwifi/mvm/sta.c | 51 ++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
index 190bf1a..e52c46b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -850,6 +850,41 @@ out_err:
return ret;
}
+static void iwl_mvm_change_queue_owner(struct iwl_mvm *mvm, int queue)
+{
+ struct iwl_scd_txq_cfg_cmd cmd = {
+ .scd_queue = queue,
+ .action = SCD_CFG_UPDATE_QUEUE_TID,
+ };
+ s8 sta_id;
+ int tid;
+ unsigned long tid_bitmap;
+ int ret;
+
+ lockdep_assert_held(&mvm->mutex);
+
+ spin_lock_bh(&mvm->queue_info_lock);
+ sta_id = mvm->queue_info[queue].ra_sta_id;
+ tid_bitmap = mvm->queue_info[queue].tid_bitmap;
+ spin_unlock_bh(&mvm->queue_info_lock);
+
+ if (WARN(!tid_bitmap, "TXQ %d has no tids assigned to it\n", queue))
+ return;
+
+ /* Find any TID for queue */
+ tid = find_first_bit(&tid_bitmap, IWL_MAX_TID_COUNT + 1);
+ cmd.tid = tid;
+ cmd.tx_fifo = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];
+
+ ret = iwl_mvm_send_cmd_pdu(mvm, SCD_QUEUE_CFG, 0, sizeof(cmd), &cmd);
+ if (ret)
+ IWL_ERR(mvm, "Failed to update owner of TXQ %d (ret=%d)\n",
+ queue, ret);
+ else
+ IWL_DEBUG_TX_QUEUES(mvm, "Changed TXQ %d ownership to tid %d\n",
+ queue, tid);
+}
+
static void iwl_mvm_unshare_queue(struct iwl_mvm *mvm, int queue)
{
struct ieee80211_sta *sta;
@@ -1005,14 +1040,30 @@ void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
/* Reconfigure queues requiring reconfiguation */
for (queue = 0; queue < IWL_MAX_HW_QUEUES; queue++) {
bool reconfig;
+ bool change_owner;
spin_lock_bh(&mvm->queue_info_lock);
reconfig = (mvm->queue_info[queue].status ==
IWL_MVM_QUEUE_RECONFIGURING);
+
+ /*
+ * We need to take into account a situation in which a TXQ was
+ * allocated to TID x, and then turned shared by adding TIDs y
+ * and z. If TID x becomes inactive and is removed from the TXQ,
+ * ownership must be given to one of the remaining TIDs.
+ * This is mainly because if TID x continues - a new queue can't
+ * be allocated for it as long as it is an owner of another TXQ.
+ */
+ change_owner = !(mvm->queue_info[queue].tid_bitmap &
+ BIT(mvm->queue_info[queue].txq_tid)) &&
+ (mvm->queue_info[queue].status ==
+ IWL_MVM_QUEUE_SHARED);
spin_unlock_bh(&mvm->queue_info_lock);
if (reconfig)
iwl_mvm_unshare_queue(mvm, queue);
+ else if (change_owner)
+ iwl_mvm_change_queue_owner(mvm, queue);
}
/* Go over all stations with deferred traffic */
--
2.8.1
