From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (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 81FAC522F12; Fri, 9 Oct 2026 18:33:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791570835; cv=none; b=EJj9h+mnH+vGVpZEsmQ0H8EMH8652Fhunv7EDoh7D8VB1dZO57FKqkZsFQy795ZQ/X1Z+no+uIsPqBNQJwfNkFefMZ6SWgMbht03pSRdJoY9eHbBZxhodwwhHkqiVbagU+0AiXtvlBUhuglcDaWhWtOdKIo6V3zc0yhdBOcgRBc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791570835; c=relaxed/simple; bh=pQ2NgcsCaUjxkX9FDnAMfCJ9PJ+/KgsSHAx5igGK3B4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AnUV7Wr7vSKQ7KPudGjH0zLypVnX0fkI+91+XZy3JIJ0x1Ih7EBmQvY5U0gWAcGFPZDDRbvCt6lkbWlqe7nVjzZkKNJmMkXpgFVppimSOB9sct76+wOh1IUxvwnoDhMXAs6ufCN9aWlOwVBgAnmz3BfFkLFNF4rodu5qRGHmkDw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=Va7PVlwV; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="Va7PVlwV" Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 699Ha5wn736789; Fri, 9 Oct 2026 18:33:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=RSCr+T+GDaBV6ogpj mxaQdS8wqrdptG1TtxIxVUCskI=; b=Va7PVlwVW4nTIa2YAQ3BCe+CikI2m8LnK ay2PN4zXwR2RFxnxeT6fIDrQW4CbQoAYQb3AZhi5B4gcCqUkCB3X+gmwj/bFjUX7 aDcmYgbDu2K+zd7BpsUMa8+v3WIi/XVUvdychp/R0+ut13q7RbXol1xedAezdNBm lmdsKXiF8NAPTpQXggYfOtaZFCVSyJGLZfU4WoAhC4yFp/6EEV1RyH71QfBx8sCa xZjUPS2DMj05UoQUHhot71DyGO/q1+GHxsP1U/kyRT5t1jZh5vCzgxrGfaCG/qdA w7uVLvZJb2dY6kfM6Snr1SCkfmldeUzZCjIvwuxIBJr4DiaQHB9hQ== Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4h74tdr914-1 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 09 Oct 2026 18:33:36 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.11/8.18.1.11) with ESMTP id 699HN8kT1169766; Fri, 9 Oct 2026 18:33:36 GMT Received: from smtprelay02.wdc07v.mail.ibm.com ([172.16.1.69]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4h5s351xhd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 09 Oct 2026 18:33:36 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (smtpav02.dal12v.mail.ibm.com [10.241.53.101]) by smtprelay02.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 699IXXJK27984474 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 9 Oct 2026 18:33:34 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 960725805F; Fri, 9 Oct 2026 18:33:33 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 59E5F58051; Fri, 9 Oct 2026 18:33:31 +0000 (GMT) Received: from localhost.localdomain (unknown [9.67.110.242]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 9 Oct 2026 18:33:31 +0000 (GMT) From: Mingming Cao To: netdev@vger.kernel.org Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, nnac123@linux.ibm.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, horms@kernel.org, davemarq@linux.ibm.com, bjking1@linux.ibm.com Subject: [PATCH net-next v3 7/8] ibmveth: wait for in-flight transmits in ibmveth_close() Date: Fri, 9 Oct 2026 11:32:57 -0700 Message-Id: <20261009183258.18624-8-mmc@linux.ibm.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261009183258.18624-1-mmc@linux.ibm.com> References: <20261009183258.18624-1-mmc@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=JL6uIMKb c=1 sm=1 tr=0 ts=6ac93380 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=4X-BtLuwBG46RJIdyTYA:9 X-Proofpoint-ORIG-GUID: ilQ6vN9oyP4AAcnwgN_LKj5Y5tcjOZHe X-Proofpoint-GUID: -xZRZCmJq8Q_GcIzhmA2KxCdPL1iRx3w X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA5MDA3MiBTYWx0ZWRfXwQOViEUm+u+A PUVzr+FGLN2Erg3v+cIq5HISFa6hOiFGFu+GvlPyZCGINHiJpLOFqSQoHZgyfDG1VrKDiUD0osK LNeQgL3UBdbHP5/XJIPHfBmVqBccRd8= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA5MDA3MiBTYWx0ZWRfX8VHWxfTqEyMI V9a3cgNYUNJcQoqPYnOEHloYp4+SpRRW73NpNfdbjOqgUZgfVbjnb1P1VOjogDDKuJNn1/32imE NIUwK51XEHHmApfRN0jQ6lcVmFPRUnD8MRsyG5P+MiIMJkkwxHno8Zr7EVpqu+51BvVGRtgD+kS HjLD6rMoxdfpABzokmbS5gmijSSpNji5/hYbq23lO52jxN7q5LfwZ3b8HBBZBYkZ+bd1kq5WM0N ZaZFNs77HMfABfdbnKeVzcIQoP5FmYbZ8gh0w6q5Q4VpxAx7c/CFM2/cTUuXOKPC6AaUv1Y/mOE qviBrGuH/lM0JQpgWzsI7OHkabl7GsRCrvD7+ZSSBeFK0gFl5lbT/4J9t0a5KAKZrWuxh5xjH7P nP+mGM56iJgbjRlPTiixGV2H8WguD8MPM8SNvyJmWi/VFAq99sQTZLQWHhOz1622UCjlT68Ro8I eanlvHkXqodEUyQn2Xg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-09_05,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 bulkscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610090072 ibmveth_close() frees the TX buffers after netif_tx_stop_all_queues(), which does not wait for an ibmveth_start_xmit() already running on another CPU. That transmit can copy into a freed buffer and hand PHYP a stale DMA address. MTU, csum/TSO and buffer pool changes call ibmveth_close() directly while traffic flows. ifdown and the reset work go through dev_close(), which waits for running transmits only when the qdisc has an enqueue function, so with noqueue they race the same way. Use netif_tx_disable(), which waits for running transmits. Found by AI-assisted review of the ibmveth multi-queue RX series and confirmed by code inspection; the race was not reproduced. Tested on a POWER10 LPAR with MTU changes during a ping flood, with no warnings. No kernel selftests cover ibmveth. Fixes: d6832ca48d8a ("ibmveth: Copy tx skbs into a premapped buffer") Signed-off-by: Mingming Cao --- Changes in v2: - commit message: dev_close() waits for running transmits only when the qdisc has an enqueue function, so ifdown and the reset work race the same way with noqueue drivers/net/ethernet/ibm/ibmveth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index 18eb0f27512e..7dec7ca9753b 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -836,7 +836,7 @@ static int ibmveth_close(struct net_device *netdev) napi_disable(&adapter->napi); - netif_tx_stop_all_queues(netdev); + netif_tx_disable(netdev); h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); -- 2.50.1 (Apple Git-155)