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authorMark Zhang <markzhang@nvidia.com>2022-09-08 13:09:01 +0300
committerLeon Romanovsky <leon@kernel.org>2022-09-22 12:35:21 +0300
commit5a3749493394276449cfc4efb417ed267edbd480 (patch)
treec0f618e26bcf9d9aa763fa8c42daf62d2b7d5e02 /io_uring
parentbf9a9928510a03e445fa4f54bdc0b8e71f4c0067 (diff)
downloadlinux-5a3749493394276449cfc4efb417ed267edbd480.tar.gz
RDMA/cma: Multiple path records support with netlink channel
Support receiving inbound and outbound IB path records (along with GMP PathRecord) from user-space service through the RDMA netlink channel. The LIDs in these 3 PRs can be used in this way: 1. GMP PR: used as the standard local/remote LIDs; 2. DLID of outbound PR: Used as the "dlid" field for outbound traffic; 3. DLID of inbound PR: Used as the "dlid" field for outbound traffic in responder side. This is aimed to support adaptive routing. With current IB routing solution when a packet goes out it's assigned with a fixed DLID per target, meaning a fixed router will be used. The LIDs in inbound/outbound path records can be used to identify group of routers that allow communication with another subnet's entity. With them packets from an inter-subnet connection may travel through any router in the set to reach the target. As confirmed with Jason, when sending a netlink request, kernel uses LS_RESOLVE_PATH_USE_ALL so that the service knows kernel supports multiple PRs. Signed-off-by: Mark Zhang <markzhang@nvidia.com> Reviewed-by: Mark Bloch <mbloch@nvidia.com> Link: https://lore.kernel.org/r/2fa2b6c93c4c16c8915bac3cfc4f27be1d60519d.1662631201.git.leonro@nvidia.com Signed-off-by: Leon Romanovsky <leon@kernel.org>
Diffstat (limited to 'io_uring')
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