From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (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 A07693CF67A; Wed, 22 Apr 2026 11:29:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776857372; cv=none; b=fs0Wl/MdPMZRxYYhncGRM4sZjYB5N2FL/bEUkAs08wo7w0COWIrsjxJMnpdFroxIqFoKRSip5OjLZYBErSTl23Cf62E57GjluMG7nz4hwHuqPorNDyHJOrW1K0EkPgrrwaEj/qNuaELRIOXKbo0AwcnxyilBW2NMa+AAeP7b9RY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776857372; c=relaxed/simple; bh=8Yu9AhycblC0jgrvSU9P5Iijhr7hjgqaVjh7IVp+nBM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WofRxT+tw8QrwWIuHt/yzMVfXlhXhe16AFD2gvSXa3Yu57qG/sbe1I0w3MsbTh5fFwr5ZuEO8cVPusBzL5WzBzplKk+BoAMEH+TIJFDY8A+S4oPknWHqRl/3wZpCdPP1gkhCp4aIiUvdd7vM5blR7dLuOzk8KUTbNmLjR/6/DWs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=Tg6eEF7F; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="Tg6eEF7F" Received: from pps.filterd (m0528006.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 63LIbdCc460608; Wed, 22 Apr 2026 04:29:21 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2025-q2; bh=PI2w7VIQwHzslKjhFhmPmWwQ5wHNLy5oscyWVJBbvz0=; b=Tg6eEF7Fo4by aHUzi4rNFxTUwdJcP6SZTtAqPt243jDRSc3GEt/VfhRsoWAoYvogio0y+L2vmP1M 4tcLKen1zQ6dGaxT9uUqMzN8aJh3dT8SSMW0cg0OEM7pLWptRb3HU7IMtFtp6m72 FK46de5CNOEMACtJ8/la8GT1q7ZLri9Ao54WjY9WD2oQAPKicO8HAddJsM70efAH 62cLr8qZbia5wAc1HWtPn2glPIK+VxkZw3siud1Hs+0DiZM/OBQv489qo3uAACNX zWt9FITZzArQrAinQf4wid6FUk9H12whXG+doYSErlok/uS2u+1oZ1FNjnxRw1CJ 881ZOtj2vg== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 4dpep9mnf5-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Wed, 22 Apr 2026 04:29:20 -0700 (PDT) Received: from localhost (2620:10d:c0a8:fe::f072) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.37; Wed, 22 Apr 2026 11:29:19 +0000 From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: , Pavel Begunkov , "Jens Axboe" CC: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , , , , , "David S. Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan , Vishwanath Seshagiri Subject: [PATCH 2/5] io_uring/zcrx: notify user on frag copy fallback Date: Wed, 22 Apr 2026 04:25:13 -0700 Message-ID: <20260422112522.3316660-3-cleger@meta.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260422112522.3316660-1-cleger@meta.com> References: <20260422112522.3316660-1-cleger@meta.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=VYjH+lp9 c=1 sm=1 tr=0 ts=69e8b110 cx=c_pps a=MfjaFnPeirRr97d5FC5oHw==:117 a=MfjaFnPeirRr97d5FC5oHw==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=M51BFTxLslgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=7x6HtfJdh03M6CCDgxCd:22 a=kkcUborcUVj0H7zxAXTl:22 a=VabnemYjAAAA:8 a=wIfzXL8Z3gsHLL3D1c4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=gKebqoRLp9LExxC7YDUY:22 X-Proofpoint-GUID: 894fdtc0NQTca4-eDW-25f5S5VO3Vesp X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDExMCBTYWx0ZWRfXygdFLHtkTFFe nsQMSPe8ubQ3ATPe8V/1/28fIibUTc8uvVg8/QC8Dr67TGIsAU2JXorbAHxtCTB1Az7zFgtosLI GpCbmEny2lwFNvQZwbdZDetlJnIRwy0HARDKZLBrUmsU3jicSdGygnPphWrACOxi0+KnBZouIH2 XYKwDIMLTHPhjDdarPbWp7H2zbGobkZjtqgyrgrg4x1Px+LY4D9YaBT8Eou7+4Y5/yLLmlNqR2h 8SkHQTJNVZtTb+JYZ2MN6qJa9390691leaEc1/G2js+k/NmtTWll/+Uo54n4ovporRXVgkPDXvh BUPsBkdiFzwipht+PWlXHlK93YWVEB0GKfJ3sSMQe/UTwmPr3t8VEMkPXIAGrIXdc0NPg/sXWi/ UjTxksJAPLiVoueHyrlhcsONgyQzR3Pb4IK3N5ObzINZnzXwIUnEMDcqGm5gOt6YcDQQdpjRp8A Qruf4VgD0GvekbULTKQ== X-Proofpoint-ORIG-GUID: 894fdtc0NQTca4-eDW-25f5S5VO3Vesp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-22_01,2026-04-21_02,2025-10-01_01 Add a ZCRX_NOTIF_COPY notification type to signal userspace when a received fragment could not be delivered using zero-copy and was instead copied into a buffer. Signed-off-by: Clément Léger --- include/uapi/linux/io_uring/zcrx.h | 1 + io_uring/zcrx.c | 7 ++++++- io_uring/zcrx.h | 3 ++- 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/io_uring/zcrx.h b/include/uapi/linux/io_uring/zcrx.h index b8596d7d47b6..e0c0079626c8 100644 --- a/include/uapi/linux/io_uring/zcrx.h +++ b/include/uapi/linux/io_uring/zcrx.h @@ -70,6 +70,7 @@ enum zcrx_features { enum zcrx_notification_type { ZCRX_NOTIF_NO_BUFFERS = 1 << 0, + ZCRX_NOTIF_COPY = 1 << 1 }; struct zcrx_notification_desc { diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index 35ca28cb6583..732e585aa13a 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -1510,8 +1510,13 @@ static int io_zcrx_copy_frag(struct io_kiocb *req, struct io_zcrx_ifq *ifq, const skb_frag_t *frag, int off, int len) { struct page *page = skb_frag_page(frag); + int ret; + + ret = io_zcrx_copy_chunk(req, ifq, page, off + skb_frag_off(frag), len); + if (ret > 0) + zcrx_send_notif(ifq, ZCRX_NOTIF_COPY); - return io_zcrx_copy_chunk(req, ifq, page, off + skb_frag_off(frag), len); + return ret; } static int io_zcrx_recv_frag(struct io_kiocb *req, struct io_zcrx_ifq *ifq, diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h index 3ddebed06d57..1bd63adaa711 100644 --- a/io_uring/zcrx.h +++ b/io_uring/zcrx.h @@ -11,7 +11,8 @@ #define ZCRX_SUPPORTED_REG_FLAGS (ZCRX_REG_IMPORT | ZCRX_REG_NODEV) #define ZCRX_FEATURES (ZCRX_FEATURE_RX_PAGE_SIZE |\ ZCRX_FEATURE_NOTIFICATION) -#define ZCRX_NOTIF_TYPE_MASK (ZCRX_NOTIF_NO_BUFFERS) +#define ZCRX_NOTIF_TYPE_MASK (ZCRX_NOTIF_NO_BUFFERS |\ + ZCRX_NOTIF_COPY) struct io_zcrx_mem { unsigned long size; -- 2.52.0