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Tue, 9 Sep 2025 01:53:09 -0700 From: Nimrod Oren To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , "John Fastabend" , Stanislav Fomichev , Mohsin Bashir CC: Dragos Tatulea , Tariq Toukan , Carolina Jubran , , , , , Nimrod Oren Subject: [PATCH RFC net-next 4/5] selftests: drv-net: Adjust XDP header data with bpf_dynptr Date: Tue, 9 Sep 2025 11:52:35 +0300 Message-ID: <20250909085236.2234306-5-noren@nvidia.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20250909085236.2234306-1-noren@nvidia.com> References: <20250909085236.2234306-1-noren@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00004688:EE_|DS0PR12MB7874:EE_ X-MS-Office365-Filtering-Correlation-Id: ccd66cff-9763-4de6-cccb-08ddef7e5a4e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|36860700013|376014|82310400026|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?bjfWSAgYPs9P7Qe6e52j/kr/bXZrx1a2rQELHNnvbzUj9CXSdFINfwsddNZQ?= =?us-ascii?Q?+wKFHCTuoJQp4clt4L5aM152p/VSUcArieTcQgpjjXSVIuoTfuNxocKzugkR?= =?us-ascii?Q?fm/3bXQx4YR4rmDhh40/qKLgHlF3hohZc/PdCHEFNayJObLPgwVsQcLCN/e1?= =?us-ascii?Q?NtSNR8YoWzCh4vakLHmmFWzaEf+u4RmChA1xMpmRUS4ezm6CZplJVst/EKit?= =?us-ascii?Q?LWA6Nazxv1EHznD8TsnvPOFCnssvB20KSGIV4Wnwc4ncl8iYfCl3UxR9MPCw?= =?us-ascii?Q?J9Vae27GaCQC7/DdBfUEzh8IdqycV9m8zcHLV+zrt7vdpgGGSHK2n3d9pMCD?= =?us-ascii?Q?oJfqb/C0IjjM3xPIyL/MbbsotOuE63+3dOjiVHz/yB3bVZlVZNlzc5Ls80NE?= =?us-ascii?Q?VyABgKVwTJkjmQwy4kcZ4OrAdbZL2kSN+rA2MLZ1Ut40KdnVZh9aoo4CzwcI?= =?us-ascii?Q?/6Z1epRISb8PqvCkQjo/VkA15ch9rA5oEt4Peg9Mvyi6FxEY/GwCiEn2NKpA?= =?us-ascii?Q?nMDnvmdlUujZkAObwp16GAtwuRV5Qz+52Ux/KnTxmXeqE0LtaIBr7juUuOjw?= =?us-ascii?Q?P/7pMRRLsMO6cuFD1C1mn9wBFzSaL2htpb99L7AkLEstIP4ntyTxp5nDquzQ?= =?us-ascii?Q?bgdxtrHXexv69P6eG2oBZOk5JPM4/u5NqM68Q9cTZncUciPYjzFSnuN3vh5Y?= =?us-ascii?Q?lGJnziGyQdA0PUd5tMfk8YljILB+E0ve5ZRKdUbamOQXejRa0RGEUTAcm1dv?= =?us-ascii?Q?qFqwEQJGahgEWmZIhN9o1M8/bYWR06HOBQ4RkXqomOoKXURcf1zHBoJQSkTc?= =?us-ascii?Q?7q5L9qm0/+7u8Gr6JyqeJDrYvUMRavMlgxMdMqOu9aQrnSqEtETOmw1ZS9CU?= =?us-ascii?Q?w8tqaltUnhx76HLhwf6YK97oaJkoYdX7egzVPnWM1I2PQ8WqWYww2SYLiEg6?= =?us-ascii?Q?KMKH936Az5b3Nc0yg57O6NE+czgzUvwbJ7nOkLfuxeOPllJbE0YdzGZFcPGE?= =?us-ascii?Q?M8Op2GA7Lyy8OnrkYwB/2GviuuAEgzxPhXU4l4XbzTlAvlJwSN50ggTdMALp?= =?us-ascii?Q?9DJF/LRrTEd2C1tLSX2UA99saenhdaz3ixrwCYvin0e3oTd0XiG/vh4TZJkV?= =?us-ascii?Q?aUpI71iyX8CyJm9gs/BAvDI0UKEtxtT0t38mmJB4q0AAZNrdjtWQ/Y79xLRc?= =?us-ascii?Q?TxknPxMBOUcTtUOmxAZ5BWmWGuU3gZAVXpXeGPT1A0PQNxZvYI5UrXtRw6N1?= =?us-ascii?Q?3PHbx70nCElbQJXsh5RNT7wqtrMPA9Rof6ohvmjFyRJXgKe6zb0eLyGEZQLt?= =?us-ascii?Q?CiQOfkAjEtbh/mlWXsEAb1j9k3bCAhH+NCalKkc43ibn26MQQyeO6X+RyUZC?= =?us-ascii?Q?G5McJgYPdlEESY1aqJRvXBas/BzAwZo1BqVt+LMMQfjKqJtlBXO6P80oAiLN?= =?us-ascii?Q?Jled7Wxt3szQBw0TRs9rv34tLz+gbX2gv7MpQxjv0ZrO4H1f48gdFP4E3xCC?= =?us-ascii?Q?NMUt+nsYS1T4O/bAPsa38XRmSaRD4+EUHw/mj9f2q8ryXI7lyJHbXO3Qtg?= =?us-ascii?Q?=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(1800799024)(36860700013)(376014)(82310400026)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2025 08:53:31.4634 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ccd66cff-9763-4de6-cccb-08ddef7e5a4e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004688.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7874 Content-Type: text/plain; charset="utf-8" Update update_pkt to use bpf_dynptr_slice_rdwr instead of accessing the packet data directly. This makes the test viable for drivers that do not store any packet data in the linear part when in multi-buffer mode. Signed-off-by: Nimrod Oren Reviewed-by: Carolina Jubran Reviewed-by: Dragos Tatulea --- .../selftests/net/lib/xdp_native.bpf.c | 35 ++++++++++--------- 1 file changed, 19 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/net/lib/xdp_native.bpf.c b/tools/testi= ng/selftests/net/lib/xdp_native.bpf.c index 71172d32c529..ff63f572552b 100644 --- a/tools/testing/selftests/net/lib/xdp_native.bpf.c +++ b/tools/testing/selftests/net/lib/xdp_native.bpf.c @@ -208,38 +208,41 @@ static int xdp_mode_tx_handler(struct xdp_md *ctx, __= u16 port) =20 static void *update_pkt(struct xdp_md *ctx, __s16 offset, __u32 *udp_csum) { - void *data_end =3D (void *)(long)ctx->data_end; - void *data =3D (void *)(long)ctx->data; struct udphdr *udph =3D NULL; - struct ethhdr *eth =3D data; + struct ethhdr *eth =3D NULL; + struct bpf_dynptr ptr; __u32 len, len_new; =20 - if (data + sizeof(*eth) > data_end) + bpf_dynptr_from_xdp(ctx, 0, &ptr); + eth =3D bpf_dynptr_slice(&ptr, 0, NULL, sizeof(*eth)); + if (!eth) return NULL; =20 if (eth->h_proto =3D=3D bpf_htons(ETH_P_IP)) { - struct iphdr *iph =3D data + sizeof(*eth); - __u16 total_len; - - if (iph + 1 > (struct iphdr *)data_end) + struct iphdr *iph =3D bpf_dynptr_slice_rdwr(&ptr, sizeof(*eth), + NULL, sizeof(*iph)); + if (!iph) return NULL; =20 iph->tot_len =3D bpf_htons(bpf_ntohs(iph->tot_len) + offset); =20 - udph =3D (void *)eth + sizeof(*iph) + sizeof(*eth); - if (!udph || udph + 1 > (struct udphdr *)data_end) + udph =3D bpf_dynptr_slice_rdwr(&ptr, sizeof(*iph) + sizeof(*eth), + NULL, sizeof(*udph)); + if (!udph) return NULL; =20 len_new =3D bpf_htons(bpf_ntohs(udph->len) + offset); } else if (eth->h_proto =3D=3D bpf_htons(ETH_P_IPV6)) { - struct ipv6hdr *ipv6h =3D data + sizeof(*eth); - __u16 payload_len; - - if (ipv6h + 1 > (struct ipv6hdr *)data_end) + struct ipv6hdr *ipv6h =3D + bpf_dynptr_slice_rdwr(&ptr, sizeof(*eth), + NULL, sizeof(*ipv6h)); + if (!ipv6h) return NULL; =20 - udph =3D (void *)eth + sizeof(*ipv6h) + sizeof(*eth); - if (!udph || udph + 1 > (struct udphdr *)data_end) + udph =3D bpf_dynptr_slice_rdwr(&ptr, + sizeof(*ipv6h) + sizeof(*eth), + NULL, sizeof(*udph)); + if (!udph) return NULL; =20 *udp_csum =3D ~((__u32)udph->check); --=20 2.45.0