From patchwork Mon Jun 26 09:18:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Souradeep Chakrabarti X-Patchwork-Id: 13292567 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17E99EB64DD for ; Mon, 26 Jun 2023 09:21:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229909AbjFZJVN (ORCPT ); Mon, 26 Jun 2023 05:21:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34716 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229940AbjFZJUw (ORCPT ); Mon, 26 Jun 2023 05:20:52 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C06891BE4; Mon, 26 Jun 2023 02:18:20 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1099) id 559A121C3F2C; Mon, 26 Jun 2023 02:18:20 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 559A121C3F2C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1687771100; bh=w0RTwq6xnEh5PToktxOWxF1t6KZX1z6EpuCc02QAfJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VHls5pA/ruzwRNkIcImhFmzyr8irMnHGZRx2V6Qjgi+qr8THoNSAGAwg0qUH78FLZ M2PQDhE/cZxJWCL9f7NHyRAHnVNAuU6il0ikj2vt7tX4kK0NtP3N4kGlR0FMKvHUXI xR4St1XZsUv4BYi+UBJmk6aZpJa4pkL9gKC8ih9I= From: souradeep chakrabarti To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, longli@microsoft.com, sharmaajay@microsoft.com, leon@kernel.org, cai.huoqing@linux.dev, ssengar@linux.microsoft.com, vkuznets@redhat.com, tglx@linutronix.de, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: stable@vger.kernel.org, schakrabarti@microsoft.com, Souradeep Chakrabarti Subject: [PATCH 1/2 V3 net] net: mana: Fix MANA VF unload when host is unresponsive Date: Mon, 26 Jun 2023 02:18:18 -0700 Message-Id: <1687771098-26775-1-git-send-email-schakrabarti@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1687771058-26634-1-git-send-email-schakrabarti@linux.microsoft.com> References: <1687771058-26634-1-git-send-email-schakrabarti@linux.microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Souradeep Chakrabarti This patch addresses the VF unload issue, where mana_dealloc_queues() gets stuck in infinite while loop, because of host unresponsiveness. It adds a timeout in the while loop, to fix it. Fixes: ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f (net: mana: Add a driver for Microsoft Azure Network Adapter) Signed-off-by: Souradeep Chakrabarti --- V2 -> V3: * Splitted the patch in two parts. * Removed the unnecessary braces from mana_dealloc_queues(). --- drivers/net/ethernet/microsoft/mana/mana_en.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index d907727c7b7a..cb5c43c3c47e 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -2329,7 +2329,10 @@ static int mana_dealloc_queues(struct net_device *ndev) { struct mana_port_context *apc = netdev_priv(ndev); struct gdma_dev *gd = apc->ac->gdma_dev; + unsigned long timeout; struct mana_txq *txq; + struct sk_buff *skb; + struct mana_cq *cq; int i, err; if (apc->port_is_up) @@ -2348,13 +2351,25 @@ static int mana_dealloc_queues(struct net_device *ndev) * * Drain all the in-flight TX packets */ + + timeout = jiffies + 120 * HZ; for (i = 0; i < apc->num_queues; i++) { txq = &apc->tx_qp[i].txq; - - while (atomic_read(&txq->pending_sends) > 0) + while (atomic_read(&txq->pending_sends) > 0 && + time_before(jiffies, timeout)) usleep_range(1000, 2000); } + for (i = 0; i < apc->num_queues; i++) { + txq = &apc->tx_qp[i].txq; + cq = &apc->tx_qp[i].tx_cq; + while (atomic_read(&txq->pending_sends)) { + skb = skb_dequeue(&txq->pending_skbs); + mana_unmap_skb(skb, apc); + napi_consume_skb(skb, cq->budget); + atomic_sub(1, &txq->pending_sends); + } + } /* We're 100% sure the queues can no longer be woken up, because * we're sure now mana_poll_tx_cq() can't be running. */