From patchwork Mon Aug 19 22:34:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 13769060 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9181B1DF681; Mon, 19 Aug 2024 22:34:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724106897; cv=none; b=F5FckNiilXZxSOWn4qMv2iES42Oony8pR1jFnv2uInsq2Tg1wHCeBWjK1YqLLfgvKqKu9HgZWdhNwEwnrfn72BQbiFK8JJULYAlM1EPYDo2VxOEFwU4fjXberSEke1Do2so29vAUyyY1QFuE2qRzdKt5+bPw5nuiY/ivX6ztKbk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724106897; c=relaxed/simple; bh=IvV0qDABhzqZKc5/xCxF8BzJU9af5oxUA5A0YpRSIsA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Pwv9BtkgEHmHKdi1SrHq88Col+aYSoVgCx2CBDXSMZlI2Kkll/T8TdDSqP8LufWPRpgVC6geEnFNx/zv9qkr3WEjP26p8mynHbTgwx1by1TQvSzdROEv5A84Nmdt++C7kjC0ApEobKgNeOnPB7DkyBPTzbxX/kwhm6YxeV+xdNk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=n0I4aD6X; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="n0I4aD6X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724106896; x=1755642896; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IvV0qDABhzqZKc5/xCxF8BzJU9af5oxUA5A0YpRSIsA=; b=n0I4aD6XHcB43HqsEml8hXVP5k7rYhYUGPV1gUyzgMfdCwVLLorbqlfq JEH4SsP0nkWBLuHXqEHj2DujZD0wreSaUb4WvWmSqd7UcD433MbGhS5+l jrmDnqHO/Az93l3RIb8ZFMsSMqdENckjsOfKjR+tt8Y6wMGMR+UTPU8en J02Zag6jes3qLq6N119dCIg3w0FQ/6+kj2wlRdLUXrCG/Ss1eX/9IGXHz mIQy05g3rozrVzWj9dgRmc1WoelQBXmHvobAlytMrVl5WCGtNzCJ6UYi+ Ec0fDQySFdrUftkM2qspi0vjP1NXqHB0U83X9Oqm+CeACRMiM6WteoP3Q w==; X-CSE-ConnectionGUID: HuLkunh6TxS0pSODTmny1w== X-CSE-MsgGUID: bP4QXvO2SXWTaOxt9YSQcg== X-IronPort-AV: E=McAfee;i="6700,10204,11169"; a="33535181" X-IronPort-AV: E=Sophos;i="6.10,160,1719903600"; d="scan'208";a="33535181" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2024 15:34:52 -0700 X-CSE-ConnectionGUID: sHbHnwyyQTSuCNcu1KV1/g== X-CSE-MsgGUID: gtCAbF2nQO2KLpapSPkunA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,160,1719903600"; d="scan'208";a="64700543" Received: from anguy11-upstream.jf.intel.com ([10.166.9.133]) by fmviesa003.fm.intel.com with ESMTP; 19 Aug 2024 15:34:51 -0700 From: Tony Nguyen To: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, netdev@vger.kernel.org Cc: Michal Kubiak , anthony.l.nguyen@intel.com, aleksander.lobakin@intel.com, przemyslaw.kitszel@intel.com, joshua.a.hay@intel.com, nex.sw.ncis.osdt.itp.upstreaming@intel.com, stable@vger.kernel.org Subject: [PATCH net-next v2 7/9] idpf: fix netdev Tx queue stop/wake Date: Mon, 19 Aug 2024 15:34:39 -0700 Message-ID: <20240819223442.48013-8-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240819223442.48013-1-anthony.l.nguyen@intel.com> References: <20240819223442.48013-1-anthony.l.nguyen@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Michal Kubiak netif_txq_maybe_stop() returns -1, 0, or 1, while idpf_tx_maybe_stop_common() says it returns 0 or -EBUSY. As a result, there sometimes are Tx queue timeout warnings despite that the queue is empty or there is at least enough space to restart it. Make idpf_tx_maybe_stop_common() inline and returning true or false, handling the return of netif_txq_maybe_stop() properly. Use a correct goto in idpf_tx_maybe_stop_splitq() to avoid stopping the queue or incrementing the stops counter twice. Fixes: 6818c4d5b3c2 ("idpf: add splitq start_xmit") Fixes: a5ab9ee0df0b ("idpf: add singleq start_xmit and napi poll") Cc: stable@vger.kernel.org # 6.7+ Signed-off-by: Michal Kubiak Reviewed-by: Przemek Kitszel Signed-off-by: Alexander Lobakin Signed-off-by: Tony Nguyen --- .../ethernet/intel/idpf/idpf_singleq_txrx.c | 4 +++ drivers/net/ethernet/intel/idpf/idpf_txrx.c | 35 +++++-------------- drivers/net/ethernet/intel/idpf/idpf_txrx.h | 9 ++++- 3 files changed, 21 insertions(+), 27 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c index 947d3ff9677c..5ba360abbe66 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c @@ -375,6 +375,10 @@ netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, IDPF_TX_DESCS_FOR_CTX)) { idpf_tx_buf_hw_update(tx_q, tx_q->next_to_use, false); + u64_stats_update_begin(&tx_q->stats_sync); + u64_stats_inc(&tx_q->q_stats.q_busy); + u64_stats_update_end(&tx_q->stats_sync); + return NETDEV_TX_BUSY; } diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index c1df4341e9ab..60f875decd8a 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -2128,29 +2128,6 @@ void idpf_tx_splitq_build_flow_desc(union idpf_tx_flex_desc *desc, desc->flow.qw1.compl_tag = cpu_to_le16(params->compl_tag); } -/** - * idpf_tx_maybe_stop_common - 1st level check for common Tx stop conditions - * @tx_q: the queue to be checked - * @size: number of descriptors we want to assure is available - * - * Returns 0 if stop is not needed - */ -int idpf_tx_maybe_stop_common(struct idpf_tx_queue *tx_q, unsigned int size) -{ - struct netdev_queue *nq; - - if (likely(IDPF_DESC_UNUSED(tx_q) >= size)) - return 0; - - u64_stats_update_begin(&tx_q->stats_sync); - u64_stats_inc(&tx_q->q_stats.q_busy); - u64_stats_update_end(&tx_q->stats_sync); - - nq = netdev_get_tx_queue(tx_q->netdev, tx_q->idx); - - return netif_txq_maybe_stop(nq, IDPF_DESC_UNUSED(tx_q), size, size); -} - /** * idpf_tx_maybe_stop_splitq - 1st level check for Tx splitq stop conditions * @tx_q: the queue to be checked @@ -2162,7 +2139,7 @@ static int idpf_tx_maybe_stop_splitq(struct idpf_tx_queue *tx_q, unsigned int descs_needed) { if (idpf_tx_maybe_stop_common(tx_q, descs_needed)) - goto splitq_stop; + goto out; /* If there are too many outstanding completions expected on the * completion queue, stop the TX queue to give the device some time to @@ -2181,10 +2158,12 @@ static int idpf_tx_maybe_stop_splitq(struct idpf_tx_queue *tx_q, return 0; splitq_stop: + netif_stop_subqueue(tx_q->netdev, tx_q->idx); + +out: u64_stats_update_begin(&tx_q->stats_sync); u64_stats_inc(&tx_q->q_stats.q_busy); u64_stats_update_end(&tx_q->stats_sync); - netif_stop_subqueue(tx_q->netdev, tx_q->idx); return -EBUSY; } @@ -2207,7 +2186,11 @@ void idpf_tx_buf_hw_update(struct idpf_tx_queue *tx_q, u32 val, nq = netdev_get_tx_queue(tx_q->netdev, tx_q->idx); tx_q->next_to_use = val; - idpf_tx_maybe_stop_common(tx_q, IDPF_TX_DESC_NEEDED); + if (idpf_tx_maybe_stop_common(tx_q, IDPF_TX_DESC_NEEDED)) { + u64_stats_update_begin(&tx_q->stats_sync); + u64_stats_inc(&tx_q->q_stats.q_busy); + u64_stats_update_end(&tx_q->stats_sync); + } /* Force memory writes to complete before letting h/w * know there are new descriptors to fetch. (Only diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h index 2478f71adb95..df3574ac58c2 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h @@ -1020,7 +1020,6 @@ void idpf_tx_dma_map_error(struct idpf_tx_queue *txq, struct sk_buff *skb, struct idpf_tx_buf *first, u16 ring_idx); unsigned int idpf_tx_desc_count_required(struct idpf_tx_queue *txq, struct sk_buff *skb); -int idpf_tx_maybe_stop_common(struct idpf_tx_queue *tx_q, unsigned int size); void idpf_tx_timeout(struct net_device *netdev, unsigned int txqueue); netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb, struct idpf_tx_queue *tx_q); @@ -1029,4 +1028,12 @@ bool idpf_rx_singleq_buf_hw_alloc_all(struct idpf_rx_queue *rxq, u16 cleaned_count); int idpf_tso(struct sk_buff *skb, struct idpf_tx_offload_params *off); +static inline bool idpf_tx_maybe_stop_common(struct idpf_tx_queue *tx_q, + u32 needed) +{ + return !netif_subqueue_maybe_stop(tx_q->netdev, tx_q->idx, + IDPF_DESC_UNUSED(tx_q), + needed, needed); +} + #endif /* !_IDPF_TXRX_H_ */