From patchwork Thu Oct 7 16:25:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeroen de Borst X-Patchwork-Id: 12542315 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE287C433F5 for ; Thu, 7 Oct 2021 16:25:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90D8F61245 for ; Thu, 7 Oct 2021 16:25:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242707AbhJGQ1o (ORCPT ); Thu, 7 Oct 2021 12:27:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55746 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242660AbhJGQ1j (ORCPT ); Thu, 7 Oct 2021 12:27:39 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78D90C061768 for ; Thu, 7 Oct 2021 09:25:44 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id w4-20020a1709029a8400b00138e222b06aso3462387plp.12 for ; Thu, 07 Oct 2021 09:25:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=zHxeeZD1jZwO/Usfb2NsWkAnbNZnwg7n8Dn9pOEtrEk=; b=lxM1eWtkvZZt6Mqczx7qeWa1aKJY2GpgnCFsyxJ0nycAY0ZlWcvjUu6LJzXvfDjRc0 +GBMxCbmD01f0Nz5gkQ2u2QXRN3vuThx2ijGFBc1Qspx6nzmm26gJY+TeNSKncvvKTd6 ID75ZHX68Lnj3Sl23Yt2RrdyNv13UsEYxRJYrjW05cIINAUPcDk/PZX+irXs9LEAv3Dn 4zqFTN6WzlZ9FLdYvPottm4Y7Hy7K9JKms83e00jlTasOPUkv2srzmHdfjxwJTYWmzls CfOT8bcASDqN6prpsjVbT8qLJcgwZ3RlMhlxS0vDZKD/BvM0vEtYhpiDoCvZRUz/BmTt Gd6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=zHxeeZD1jZwO/Usfb2NsWkAnbNZnwg7n8Dn9pOEtrEk=; b=u/u3YsH92YpirnXgDdTpHtNhbnA8Eydqv7podraM3exmQRuVgvTs/1DmlrMgf3F4rq t4JuzHySTDubOQNB+IMhziLZV+tZP/Uxv5u+N8ZVhVqcZ4+JBIhrfi8B7pzH9axzGwHP xjtTQTf8kO9pFb6PRMWLy6jI8H8S5wvBBgCw9FsWMgMbOoxyPC4UTl81SSRJl4wSrfsb OkTFZdJUZIm5DVK+CIgxZyrlyOiiORFrAtJfvt1pnDaMpUcK26+QLBDkUnwUJrWsuPP+ HGj26DHps6Ee+PAZThllewnQd7ljen1ONdA2dTdlXlwzsLLCRxJwXdRg3iDbA3GMwzFu UYug== X-Gm-Message-State: AOAM530zYGHXchBCbZNshDbBxmyQK/6hJ0x31ms0jCA1gKoveivvKdt7 FWFREuofw/VakETnDukADt1z+NLZOKJlANHmLI9lIsQJ22Qkm1teca4AL4LWN173MgEx9zQ3u8p GK6NN1LwdnboUZlexmz5LaH8P//+Zu02Kvik18IxrRpGRxVh05htKmeM+4BmV/gMJZgE= X-Google-Smtp-Source: ABdhPJxQqIEOxPfYTHSkpp3Mk4beyZrLznIRiSKrykAYD4sVCacDp69hifydVBECan3gdZ33+yspeWXMiEUqVg== X-Received: from jeroendb.sea.corp.google.com ([2620:15c:100:202:fe55:7411:11ac:c2a7]) (user=jeroendb job=sendgmr) by 2002:a17:902:a414:b0:13e:45cd:1939 with SMTP id p20-20020a170902a41400b0013e45cd1939mr4924319plq.54.1633623943851; Thu, 07 Oct 2021 09:25:43 -0700 (PDT) Date: Thu, 7 Oct 2021 09:25:31 -0700 In-Reply-To: <20211007162534.1502578-1-jeroendb@google.com> Message-Id: <20211007162534.1502578-4-jeroendb@google.com> Mime-Version: 1.0 References: <20211007162534.1502578-1-jeroendb@google.com> X-Mailer: git-send-email 2.33.0.800.g4c38ced690-goog Subject: [PATCH net-next 4/7] gve: Recover from queue stall due to missed IRQ From: Jeroen de Borst To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, John Fraker , David Awogbemila Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: John Fraker Don't always reset the driver on a TX timeout. Attempt to recover by kicking the queue in case an IRQ was missed. Fixes: 9e5f7d26a4c08 ("gve: Add workqueue and reset support") Signed-off-by: John Fraker Signed-off-by: David Awogbemila --- drivers/net/ethernet/google/gve/gve.h | 4 +- drivers/net/ethernet/google/gve/gve_adminq.h | 1 + drivers/net/ethernet/google/gve/gve_main.c | 48 +++++++++++++++++++- 3 files changed, 51 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h index 003b30b91c6d..b8d46adb9c1a 100644 --- a/drivers/net/ethernet/google/gve/gve.h +++ b/drivers/net/ethernet/google/gve/gve.h @@ -30,7 +30,7 @@ #define GVE_MIN_MSIX 3 /* Numbers of gve tx/rx stats in stats report. */ -#define GVE_TX_STATS_REPORT_NUM 5 +#define GVE_TX_STATS_REPORT_NUM 6 #define GVE_RX_STATS_REPORT_NUM 2 /* Interval to schedule a stats report update, 20000ms. */ @@ -413,7 +413,9 @@ struct gve_tx_ring { u32 q_num ____cacheline_aligned; /* queue idx */ u32 stop_queue; /* count of queue stops */ u32 wake_queue; /* count of queue wakes */ + u32 queue_timeout; /* count of queue timeouts */ u32 ntfy_id; /* notification block index */ + u32 last_kick_msec; /* Last time the queue was kicked */ dma_addr_t bus; /* dma address of the descr ring */ dma_addr_t q_resources_bus; /* dma address of the queue resources */ dma_addr_t complq_bus_dqo; /* dma address of the dqo.compl_ring */ diff --git a/drivers/net/ethernet/google/gve/gve_adminq.h b/drivers/net/ethernet/google/gve/gve_adminq.h index 47c3d8f313fc..3953f6f7a427 100644 --- a/drivers/net/ethernet/google/gve/gve_adminq.h +++ b/drivers/net/ethernet/google/gve/gve_adminq.h @@ -270,6 +270,7 @@ enum gve_stat_names { TX_LAST_COMPLETION_PROCESSED = 5, RX_NEXT_EXPECTED_SEQUENCE = 6, RX_BUFFERS_POSTED = 7, + TX_TIMEOUT_CNT = 8, // stats from NIC RX_QUEUE_DROP_CNT = 65, RX_NO_BUFFERS_POSTED = 66, diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index 74e35a87ec38..d969040deab6 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -24,6 +24,9 @@ #define GVE_VERSION "1.0.0" #define GVE_VERSION_PREFIX "GVE-" +// Minimum amount of time between queue kicks in msec (10 seconds) +#define MIN_TX_TIMEOUT_GAP (1000 * 10) + const char gve_version_str[] = GVE_VERSION; static const char gve_version_prefix[] = GVE_VERSION_PREFIX; @@ -1109,9 +1112,47 @@ static void gve_turnup(struct gve_priv *priv) static void gve_tx_timeout(struct net_device *dev, unsigned int txqueue) { - struct gve_priv *priv = netdev_priv(dev); + struct gve_notify_block *block; + struct gve_tx_ring *tx = NULL; + struct gve_priv *priv; + u32 last_nic_done; + u32 current_time; + u32 ntfy_idx; + + netdev_info(dev, "Timeout on tx queue, %d", txqueue); + priv = netdev_priv(dev); + if (txqueue > priv->tx_cfg.num_queues) + goto reset; + + ntfy_idx = gve_tx_idx_to_ntfy(priv, txqueue); + if (ntfy_idx > priv->num_ntfy_blks) + goto reset; + + block = &priv->ntfy_blocks[ntfy_idx]; + tx = block->tx; + current_time = jiffies_to_msecs(jiffies); + if (tx->last_kick_msec + MIN_TX_TIMEOUT_GAP > current_time) + goto reset; + + /* Check to see if there are missed completions, which will allow us to + * kick the queue. + */ + last_nic_done = gve_tx_load_event_counter(priv, tx); + if (last_nic_done - tx->done) { + netdev_info(dev, "Kicking queue %d", txqueue); + iowrite32be(GVE_IRQ_MASK, gve_irq_doorbell(priv, block)); + napi_schedule(&block->napi); + tx->last_kick_msec = current_time; + goto out; + } // Else reset. + +reset: gve_schedule_reset(priv); + +out: + if (tx) + tx->queue_timeout++; priv->tx_timeo_cnt++; } @@ -1239,6 +1280,11 @@ void gve_handle_report_stats(struct gve_priv *priv) .value = cpu_to_be64(last_completion), .queue_id = cpu_to_be32(idx), }; + stats[stats_idx++] = (struct stats) { + .stat_name = cpu_to_be32(TX_TIMEOUT_CNT), + .value = cpu_to_be64(priv->tx[idx].queue_timeout), + .queue_id = cpu_to_be32(idx), + }; } } /* rx stats */