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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: DM6PR12MB3753.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0fa18a29-6fd7-401f-2012-08db5c70b591 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 May 2023 16:05:35.5193 (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: Vkm/v8KXhXPe1gv8YvzHYmkbujEUkALm6nwUGfaQLjBILZXKK6ECfD8ogAxU+hNjEJwdoKIGSV/IddODGJXvlA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5991 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: Erez Ferber > Sent: Wednesday, May 24, 2023 3:02 PM > To: dev@dpdk.org > Cc: Slava Ovsiienko ; Matan Azrad > ; Raslan Darawsheh ; Erez Ferber > ; stable@dpdk.org > Subject: [PATCH] common/mlx5: adjust fork call with the new kernel API >=20 > From: Erez Ferber >=20 > While doing process fork() the operating system remaps all the parent > process's memory to the address space of the child process and activates = the > Copy-on-Write mechanics - it duplicates physical pages once memory writin= g > happens in the child process. Sometimes memory duplication is not allowed= - > for example, if the page contains hardware queue descriptors. To handle > similar issues the rdma-core library should be prepared for forking. >=20 > The ibv_fork_init() prepares the library to track all the related memory = and > prevent it from forking using madvise() system API. This approach allows = fork, > but not all the memory is forked to the child process and, application sh= ould > care not to touch pages where the parent application allocated the rdma-c= ore > objects. >=20 > The newer kernels propose an option of copy-on-fork for DMA pages and > tracking all the memory and disabling it for the forking is no longer nee= ded. > The new API routine ibv_is_fork_initialized() should be involved to decid= e if > library initialization for forking is required. >=20 > Fixes: 0e83b8e536 ("net/mlx5: move rdma-core calls to separate file") > Cc: stable@dpdk.org > Signed-off-by: Erez Ferber Acked-by: Viacheslav Ovsiienko