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Tue, 15 Jun 2021 21:15:01 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 5495CC43460; Tue, 15 Jun 2021 21:15:00 +0000 (UTC) Received: from jouni.codeaurora.org (85-76-78-13-nat.elisa-mobile.fi [85.76.78.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jouni) by smtp.codeaurora.org (Postfix) with ESMTPSA id 464AAC4338A; Tue, 15 Jun 2021 21:14:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 464AAC4338A Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=jouni@codeaurora.org From: Jouni Malinen To: Kalle Valo Cc: ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, P Praneesh , Karthikeyan Periyasamy , Jouni Malinen Subject: [PATCH 12/12] ath11k: avoid unnecessary lock contention in tx_completion path Date: Wed, 16 Jun 2021 00:14:07 +0300 Message-Id: <20210615211407.92233-13-jouni@codeaurora.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210615211407.92233-1-jouni@codeaurora.org> References: <20210615211407.92233-1-jouni@codeaurora.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210615_141502_389105_D51BD584 X-CRM114-Status: GOOD ( 13.69 ) X-BeenThere: ath11k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath11k" Errors-To: ath11k-bounces+ath11k=archiver.kernel.org@lists.infradead.org From: P Praneesh Lock is not needed for the readable idr operation, so avoid spin_lock_bh for the idr_find() call. No need to disable the bottom half preempt if it is already in bottom half context, so modify the spin_lock_bh to spin_lock in the data tx completion handler. Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-01734-QCAHKSWPL_SILICONZ-1 v2 Co-developed-by: Karthikeyan Periyasamy Signed-off-by: Karthikeyan Periyasamy Signed-off-by: P Praneesh Signed-off-by: Jouni Malinen --- drivers/net/wireless/ath/ath11k/dp_tx.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_tx.c b/drivers/net/wireless/ath/ath11k/dp_tx.c index ab9ccf0eb274..659f9d98bc0c 100644 --- a/drivers/net/wireless/ath/ath11k/dp_tx.c +++ b/drivers/net/wireless/ath/ath11k/dp_tx.c @@ -288,19 +288,18 @@ static void ath11k_dp_tx_free_txbuf(struct ath11k_base *ab, u8 mac_id, struct sk_buff *msdu; struct ath11k_skb_cb *skb_cb; - spin_lock_bh(&tx_ring->tx_idr_lock); msdu = idr_find(&tx_ring->txbuf_idr, msdu_id); - if (!msdu) { + if (unlikely(!msdu)) { ath11k_warn(ab, "tx completion for unknown msdu_id %d\n", msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); return; } skb_cb = ATH11K_SKB_CB(msdu); + spin_lock(&tx_ring->tx_idr_lock); idr_remove(&tx_ring->txbuf_idr, msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); + spin_unlock(&tx_ring->tx_idr_lock); dma_unmap_single(ab->dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); dev_kfree_skb_any(msdu); @@ -320,12 +319,10 @@ ath11k_dp_tx_htt_tx_complete_buf(struct ath11k_base *ab, struct ath11k_skb_cb *skb_cb; struct ath11k *ar; - spin_lock_bh(&tx_ring->tx_idr_lock); msdu = idr_find(&tx_ring->txbuf_idr, ts->msdu_id); if (unlikely(!msdu)) { ath11k_warn(ab, "htt tx completion for unknown msdu_id %d\n", ts->msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); return; } @@ -334,8 +331,9 @@ ath11k_dp_tx_htt_tx_complete_buf(struct ath11k_base *ab, ar = skb_cb->ar; + spin_lock(&tx_ring->tx_idr_lock); idr_remove(&tx_ring->txbuf_idr, ts->msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); + spin_unlock(&tx_ring->tx_idr_lock); if (atomic_dec_and_test(&ar->dp.num_tx_pending)) wake_up(&ar->dp.tx_empty_waitq); @@ -584,16 +582,16 @@ void ath11k_dp_tx_completion_handler(struct ath11k_base *ab, int ring_id) continue; } - spin_lock_bh(&tx_ring->tx_idr_lock); msdu = idr_find(&tx_ring->txbuf_idr, msdu_id); if (unlikely(!msdu)) { ath11k_warn(ab, "tx completion for unknown msdu_id %d\n", msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); continue; } + + spin_lock(&tx_ring->tx_idr_lock); idr_remove(&tx_ring->txbuf_idr, msdu_id); - spin_unlock_bh(&tx_ring->tx_idr_lock); + spin_unlock(&tx_ring->tx_idr_lock); ar = ab->pdevs[mac_id].ar; -- 2.25.1 -- ath11k mailing list ath11k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath11k