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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM4PR12MB5167.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a89f5500-89c8-4a45-f95b-08da39a7b39b X-MS-Exchange-CrossTenant-originalarrivaltime: 19 May 2022 14:56:06.1386 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: FWGSo04+mA4LP+/mWSQiky93bWKlu92L3SA8WHkgUaZ1zY6CBtgaWnYh4e/bTvCauqJS+XE9jKkHJWF0UQ3ncQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4292 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org > -----Original Message----- > From: Ruifeng Wang > Sent: Tuesday, January 4, 2022 5:01 AM > To: Matan Azrad ; Slava Ovsiienko > > Cc: dev@dpdk.org; honnappa.nagarahalli@arm.com; stable@dpdk.org; > nd@arm.com; Ruifeng Wang > Subject: [PATCH] net/mlx5: fix risk in Rx descriptor read in NEON vector = path >=20 > In NEON vector PMD, vector load loads two contiguous 8B of > descriptor data into vector register. Given vector load ensures no > 16B atomicity, read of the word that includes op_own field could be > reordered after read of other words. In this case, some words could > contain invalid data. >=20 > Reloaded qword0 after read barrier to update vector register. This > ensures that the fetched data is correct. >=20 > Testpmd single core test on N1SDP/ThunderX2 showed no performance > drop. >=20 > Fixes: 1742c2d9fab0 ("net/mlx5: fix synchronization on polling Rx > completions") > Cc: stable@dpdk.org >=20 > Signed-off-by: Ruifeng Wang > --- Tested with BlueField-2 and didn't see a performance impact. Tested-by: Ali Alnubani Thanks, Ali