Commit 005fb161 authored by Qi Zhou's avatar Qi Zhou Committed by Kalle Valo
Browse files

ath10k: Improve performance by reducing tx_lock contention



During tx completion, tx_lock is held for longer than required, preventing
efficient refill of htt->pending_tx. Refactor the code so that only MSDU
related operations are protected by the lock.

Improves downstream performance on a dual-core ARM Freescale LS1024A
(f.k.a. Mindspeed Comcerto 2000) AP with a 3x3 client from 495 to 580 Mbps.
Other CPU bound multicore systems may also benefit.
Signed-off-by: default avatarDenton Gentry <dgentry@google.com>
Signed-off-by: default avatarAvery Pennarun <apenwarr@google.com>
[mfaltesek@google.com: removed conflicting code for tracking msdu_ids.]
Signed-off-by: default avatarMarty Faltesek <mfaltesek@google.com>
Signed-off-by: default avatarKalle Valo <kvalo@qca.qualcomm.com>
parent 3413e97d
......@@ -1631,8 +1631,6 @@ static void ath10k_htt_rx_frm_tx_compl(struct ath10k *ar,
__le16 msdu_id;
int i;
lockdep_assert_held(&htt->tx_lock);
switch (status) {
case HTT_DATA_TX_STATUS_NO_ACK:
tx_done.no_ack = true;
......@@ -1998,15 +1996,11 @@ void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
break;
}
spin_lock_bh(&htt->tx_lock);
ath10k_txrx_tx_unref(htt, &tx_done);
spin_unlock_bh(&htt->tx_lock);
break;
}
case HTT_T2H_MSG_TYPE_TX_COMPL_IND:
spin_lock_bh(&htt->tx_lock);
__skb_queue_tail(&htt->tx_compl_q, skb);
spin_unlock_bh(&htt->tx_lock);
skb_queue_tail(&htt->tx_compl_q, skb);
tasklet_schedule(&htt->txrx_compl_task);
return;
case HTT_T2H_MSG_TYPE_SEC_IND: {
......@@ -2095,12 +2089,10 @@ static void ath10k_htt_txrx_compl_task(unsigned long ptr)
struct htt_resp *resp;
struct sk_buff *skb;
spin_lock_bh(&htt->tx_lock);
while ((skb = __skb_dequeue(&htt->tx_compl_q))) {
while ((skb = skb_dequeue(&htt->tx_compl_q))) {
ath10k_htt_rx_frm_tx_compl(htt->ar, skb);
dev_kfree_skb_any(skb);
}
spin_unlock_bh(&htt->tx_lock);
spin_lock_bh(&htt->rx_ring.lock);
while ((skb = __skb_dequeue(&htt->rx_compl_q))) {
......
......@@ -134,9 +134,7 @@ static int ath10k_htt_tx_clean_up_pending(int msdu_id, void *skb, void *ctx)
tx_done.discard = 1;
tx_done.msdu_id = msdu_id;
spin_lock_bh(&htt->tx_lock);
ath10k_txrx_tx_unref(htt, &tx_done);
spin_unlock_bh(&htt->tx_lock);
return 0;
}
......@@ -429,12 +427,11 @@ int ath10k_htt_mgmt_tx(struct ath10k_htt *htt, struct sk_buff *msdu)
spin_lock_bh(&htt->tx_lock);
res = ath10k_htt_tx_alloc_msdu_id(htt, msdu);
spin_unlock_bh(&htt->tx_lock);
if (res < 0) {
spin_unlock_bh(&htt->tx_lock);
goto err_tx_dec;
}
msdu_id = res;
spin_unlock_bh(&htt->tx_lock);
txdesc = ath10k_htc_alloc_skb(ar, len);
if (!txdesc) {
......@@ -506,12 +503,11 @@ int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *msdu)
spin_lock_bh(&htt->tx_lock);
res = ath10k_htt_tx_alloc_msdu_id(htt, msdu);
spin_unlock_bh(&htt->tx_lock);
if (res < 0) {
spin_unlock_bh(&htt->tx_lock);
goto err_tx_dec;
}
msdu_id = res;
spin_unlock_bh(&htt->tx_lock);
prefetch_len = min(htt->prefetch_len, msdu->len);
prefetch_len = roundup(prefetch_len, 4);
......
......@@ -53,8 +53,6 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
struct ath10k_skb_cb *skb_cb;
struct sk_buff *msdu;
lockdep_assert_held(&htt->tx_lock);
ath10k_dbg(ar, ATH10K_DBG_HTT,
"htt tx completion msdu_id %u discard %d no_ack %d success %d\n",
tx_done->msdu_id, !!tx_done->discard,
......@@ -66,12 +64,19 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
return;
}
spin_lock_bh(&htt->tx_lock);
msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
if (!msdu) {
ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
tx_done->msdu_id);
spin_unlock_bh(&htt->tx_lock);
return;
}
ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
__ath10k_htt_tx_dec_pending(htt);
if (htt->num_pending_tx == 0)
wake_up(&htt->empty_tx_wq);
spin_unlock_bh(&htt->tx_lock);
skb_cb = ATH10K_SKB_CB(msdu);
......@@ -90,7 +95,7 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
if (tx_done->discard) {
ieee80211_free_txskb(htt->ar->hw, msdu);
goto exit;
return;
}
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
......@@ -104,12 +109,6 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
ieee80211_tx_status(htt->ar->hw, msdu);
/* we do not own the msdu anymore */
exit:
ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
__ath10k_htt_tx_dec_pending(htt);
if (htt->num_pending_tx == 0)
wake_up(&htt->empty_tx_wq);
}
struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
......
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