From mboxrd@z Thu Jan 1 00:00:00 1970 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 mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id 563DBFCA187 for ; Mon, 9 Mar 2026 21:02:47 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 76F4D40269; Mon, 9 Mar 2026 22:02:46 +0100 (CET) Received: from OSPPR02CU001.outbound.protection.outlook.com (mail-norwayeastazon11013035.outbound.protection.outlook.com [40.107.159.35]) by mails.dpdk.org (Postfix) with ESMTP id 4AD2740261 for ; Mon, 9 Mar 2026 22:02:44 +0100 (CET) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=j7uesOHxzktzt3ZdpIYSpl9EjKYY3ZlM8yuMPh43u+ndz9RTlwsFUv77CrR0v1flYl3uO2sCI1yGWdpZuHJX+s7p2saIivv0M0C+XNist1hg4bVhwM1ypDIPTE/ECVxPaAYkmUNQymzr68YctFP0q2z0yABMXexxx4hfIRFiYyhF0SEoLNRZcS99+k45rnVlw6+iR7k0nWruZYWICcXrDRneL3sV+KjrPV3JQOq2O+mxnJ3/ESlshrA8hUdeNLoswxsnjI9aAvfxm3XRjQoynRx3njE0syHVH3W2FDWwBf3l5tScuZ8Z5N0p5cuOnhtaHJwj/GfrIGV2Qw8sPLcsEw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=juvVUGtZytyFokge3WptvNggK9GMdSxOilgOCDIt5jM=; b=lU6dkxilFU7mdQ3rtECe2clcJNyL2Y7PpKIqyZUc3R7rlFxzXrMZ6EwOjUu9+4QYMgA+pO3UVVFZnJysluvEgIDkdAmh+B6K2AyNAXO1kfBGu0X+lr5fNMWZ8UCIBQdhtzcZLpsioZbI8BEAXCxejoy51sjwk7hp7EnFuG9g4iitf2IxfZ3wJbIZ79PpEZbzhkKZ/Vw85MBYxJFUv1sF/L8ghbXowa7eNjXy9rz7y5OgdnJLUqwDnf387vqQIiY86PqOD4XkeSWkbb3y401hlrav8whdsRo2U5wrdOFbVZ7BvZNFoHR6aS2X92zoCRE+g/fDlbDapaVHI/qzoWstjg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 192.176.1.74) smtp.rcpttodomain=dpdk.org smtp.mailfrom=ericsson.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=ericsson.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ericsson.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=juvVUGtZytyFokge3WptvNggK9GMdSxOilgOCDIt5jM=; b=GsGiNTifDG5+sqpo5LTngLzy6cqrN1Ugb4wWeO110l3/3NqDtHdct8ynklVmuXG3iBaIL31KK9K03EfoaWNEh/Qkae3ny/oTUhreo9DuaH7UDiTgWIQL0pZo/lK/kOWI3Q9xabRxyGYXkZT4L+oomW+W2DylkYrqP1ch5TWzUcTujoYMumsvNym2QaHMUpZrigZhAqZgGPrNPmzGOKTgkuCRDO1lD0GZ/qyYtka/piZ3q3P1cDT1tPvcqvIm3n49Ii9mPEdAPUwM49DQlbmKEIfkYcbKeMpnprbgGZ93wxpqN7En+7JjcZk0cC/60WY8X2SALf4quM2fUXKqxJenSw== Received: from AS4P195CA0006.EURP195.PROD.OUTLOOK.COM (2603:10a6:20b:5e2::11) by DU4PR07MB10298.eurprd07.prod.outlook.com (2603:10a6:10:5ee::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9678.24; Mon, 9 Mar 2026 21:02:41 +0000 Received: from AM1PEPF000252DA.eurprd07.prod.outlook.com (2603:10a6:20b:5e2:cafe::2b) by AS4P195CA0006.outlook.office365.com (2603:10a6:20b:5e2::11) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9678.25 via Frontend Transport; Mon, 9 Mar 2026 21:02:37 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 192.176.1.74) smtp.mailfrom=ericsson.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=ericsson.com; Received-SPF: Pass (protection.outlook.com: domain of ericsson.com designates 192.176.1.74 as permitted sender) receiver=protection.outlook.com; client-ip=192.176.1.74; helo=oa.msg.ericsson.com; pr=C Received: from oa.msg.ericsson.com (192.176.1.74) by AM1PEPF000252DA.mail.protection.outlook.com (10.167.16.52) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9678.18 via Frontend Transport; Mon, 9 Mar 2026 21:02:41 +0000 Received: from seliius19819.seli.gic.ericsson.se (153.88.142.248) by smtp-central.internal.ericsson.com (100.87.178.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Mon, 9 Mar 2026 22:02:41 +0100 Received: from seliiuvd10563.seli.gic.ericsson.se (seliiuvd10563.seli.gic.ericsson.se [10.120.141.220]) by seliius19819.seli.gic.ericsson.se (Postfix) with ESMTP id C71D04020AB6; Mon, 9 Mar 2026 22:02:40 +0100 (CET) Received: by seliiuvd10563.seli.gic.ericsson.se (Postfix, from userid 93258) id ADE8C62B1399; Mon, 9 Mar 2026 22:02:40 +0100 (CET) From: Sriram Yagnaraman To: CC: , , "Sriram Yagnaraman" Subject: [PATCH v2] net/af_packet: add multi-segment mbuf support for jumbo frames Date: Mon, 9 Mar 2026 22:02:10 +0100 Message-ID: <20260309210210.1665888-1-sriram.yagnaraman@ericsson.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260309204910.1657193-1-sriram.yagnaraman@ericsson.com> References: <20260309204910.1657193-1-sriram.yagnaraman@ericsson.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM1PEPF000252DA:EE_|DU4PR07MB10298:EE_ X-MS-Office365-Filtering-Correlation-Id: ec69cd50-8dd3-4ff2-d23e-08de7e1f341f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|376014|82310400026|36860700016; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:192.176.1.74; CTRY:SE; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:oa.msg.ericsson.com; PTR:office365.se.ericsson.net; CAT:NONE; SFS:(13230040)(1800799024)(376014)(82310400026)(36860700016); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: AkeEa2VT+W+LKci2iFafMDXw3g//pwQ+Gb+geqLBniMzuRHp6q6Y9go+5800LpwzdLrLJA3nx75vyajHtL5m0yudILKRjISJi27v8TthDTjwQIC2nfYi6XWw8wVBD5NMzTe7L68IA9XIegu3HeZCPLhWgM7b+WtaY0Fu/42aXeaUyXFkUXy1F8G5K8krT6SOYFaal0f57XHQVow5zP/dYRHiVurZm5OC7q6btJud1V+z8SHbl2nhoZFGbiLevPIGXNVkdSj03K3Ijx3Y9SbTwfTGeMLotKvq+4uYyfr8MfjBbvOBPPPQE90EqGmj9aCFYR10ZK42Fm/s522dPy3iyrUS2jhcX4bzoMDkjBrf690xzBqS34bVo0ecXQ6+wkIT4BmLSPxxP361gx+afvURuw5MT+FcccNfSEsoyluLsmM4U5/fyYThWOA/pOXmAL5M X-OriginatorOrg: ericsson.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Mar 2026 21:02:41.6223 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ec69cd50-8dd3-4ff2-d23e-08de7e1f341f X-MS-Exchange-CrossTenant-Id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=92e84ceb-fbfd-47ab-be52-080c6b87953f; Ip=[192.176.1.74]; Helo=[oa.msg.ericsson.com] X-MS-Exchange-CrossTenant-AuthSource: AM1PEPF000252DA.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU4PR07MB10298 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Enable jumbo frame reception with default mbuf data room size by chaining multiple mbufs when packet exceeds single mbuf tailroom. The RX path now: - Copies first segment up to mbuf tailroom - Allocates and chains additional segments for remaining data - Properly maintains nb_segs, next pointers, and pkt_len - Silently drops packets on mbuf allocation failure This allows receiving 9KB jumbo frames using standard 2KB mbufs, chaining ~5 segments per jumbo packet. No need for custom mbuf pools with large data room. Advertises RTE_ETH_RX_OFFLOAD_SCATTER capability. Depends-on: series-34567 ("net/af_packet: fix MTU handling and add jumbo frame support") Note: Implementation generated with AI assistance. Signed-off-by: Sriram Yagnaraman --- drivers/net/af_packet/rte_eth_af_packet.c | 55 ++++++++++++++++++----- 1 file changed, 45 insertions(+), 10 deletions(-) diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c index d9fafd4..184d2c1 100644 --- a/drivers/net/af_packet/rte_eth_af_packet.c +++ b/drivers/net/af_packet/rte_eth_af_packet.c @@ -121,12 +121,13 @@ eth_af_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) { unsigned i; struct tpacket2_hdr *ppd; - struct rte_mbuf *mbuf; + struct rte_mbuf *mbuf, *seg, *prev; uint8_t *pbuf; struct pkt_rx_queue *pkt_q = queue; uint16_t num_rx = 0; unsigned long num_rx_bytes = 0; unsigned int framecount, framenum; + uint32_t pkt_len, data_len, remaining; if (unlikely(nb_pkts == 0)) return 0; @@ -148,10 +149,45 @@ eth_af_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) if (unlikely(mbuf == NULL)) break; - /* packet will fit in the mbuf, go ahead and receive it */ - rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf) = ppd->tp_snaplen; + pkt_len = ppd->tp_snaplen; pbuf = (uint8_t *) ppd + ppd->tp_mac; - memcpy(rte_pktmbuf_mtod(mbuf, void *), pbuf, rte_pktmbuf_data_len(mbuf)); + + /* copy data to mbuf chain */ + data_len = RTE_MIN(pkt_len, rte_pktmbuf_tailroom(mbuf)); + memcpy(rte_pktmbuf_mtod(mbuf, void *), pbuf, data_len); + rte_pktmbuf_data_len(mbuf) = data_len; + remaining = pkt_len - data_len; + pbuf += data_len; + prev = mbuf; + + while (remaining > 0) { + seg = rte_pktmbuf_alloc(pkt_q->mb_pool); + if (unlikely(seg == NULL)) { + rte_pktmbuf_free(mbuf); + /* release frame and break from outer loop */ + ppd->tp_status = TP_STATUS_KERNEL; + if (++framenum >= framecount) + framenum = 0; + goto next_pkt; + } + + data_len = RTE_MIN(remaining, rte_pktmbuf_tailroom(seg)); + memcpy(rte_pktmbuf_mtod(seg, void *), pbuf, data_len); + rte_pktmbuf_data_len(seg) = data_len; + pbuf += data_len; + remaining -= data_len; + + prev->next = seg; + prev = seg; + mbuf->nb_segs++; + } + + /* release incoming frame and advance ring buffer */ + ppd->tp_status = TP_STATUS_KERNEL; + if (++framenum >= framecount) + framenum = 0; + + rte_pktmbuf_pkt_len(mbuf) = pkt_len; /* check for vlan info */ if (ppd->tp_status & TP_STATUS_VLAN_VALID) { @@ -172,16 +208,14 @@ eth_af_packet_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) mbuf->ol_flags |= timestamp_dynflag; } - /* release incoming frame and advance ring buffer */ - ppd->tp_status = TP_STATUS_KERNEL; - if (++framenum >= framecount) - framenum = 0; mbuf->port = pkt_q->in_port; /* account for the receive frame */ - bufs[i] = mbuf; + bufs[num_rx] = mbuf; num_rx++; num_rx_bytes += mbuf->pkt_len; +next_pkt: + ; } pkt_q->framenum = framenum; pkt_q->rx_pkts += num_rx; @@ -411,7 +445,8 @@ eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) dev_info->tx_offload_capa = RTE_ETH_TX_OFFLOAD_MULTI_SEGS | RTE_ETH_TX_OFFLOAD_VLAN_INSERT; dev_info->rx_offload_capa = RTE_ETH_RX_OFFLOAD_VLAN_STRIP | - RTE_ETH_RX_OFFLOAD_TIMESTAMP; + RTE_ETH_RX_OFFLOAD_TIMESTAMP | + RTE_ETH_RX_OFFLOAD_SCATTER; return 0; } -- 2.43.7