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| author |   Mark Zhang <markzhang@nvidia.com> | 2022-09-08 13:09:01 +0300 |
|---|---|---|
| committer |   Leon Romanovsky <leon@kernel.org> | 2022-09-22 12:35:21 +0300 |
| commit | 5a3749493394276449cfc4efb417ed267edbd480 (patch) | |
| tree | c0f618e26bcf9d9aa763fa8c42daf62d2b7d5e02 /include/rdma | |
| parent | RDMA/core: Rename rdma_route.num_paths field to num_pri_alt_paths (diff) | |
| download | linux-dev-5a3749493394276449cfc4efb417ed267edbd480.tar.xz linux-dev-5a3749493394276449cfc4efb417ed267edbd480.zip | |
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 'include/rdma')
| -rw-r--r-- | include/rdma/ib_sa.h | 3 | ||||
| -rw-r--r-- | include/rdma/rdma_cm.h | 6 |
2 files changed, 8 insertions, 1 deletions
diff --git a/include/rdma/ib_sa.h b/include/rdma/ib_sa.h index 3634d4cc7a56..e930bec33b31 100644 --- a/include/rdma/ib_sa.h +++ b/include/rdma/ib_sa.h @@ -186,6 +186,7 @@ struct sa_path_rec { struct sa_path_rec_opa opa; }; enum sa_path_rec_type rec_type; + u32 flags; }; static inline enum ib_gid_type @@ -413,7 +414,7 @@ int ib_sa_path_rec_get(struct ib_sa_client *client, struct ib_device *device, ib_sa_comp_mask comp_mask, unsigned long timeout_ms, gfp_t gfp_mask, void (*callback)(int status, struct sa_path_rec *resp, - void *context), + int num_prs, void *context), void *context, struct ib_sa_query **query); struct ib_sa_multicast { diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h index 81916039ee24..cdc7cafab572 100644 --- a/include/rdma/rdma_cm.h +++ b/include/rdma/rdma_cm.h @@ -49,9 +49,15 @@ struct rdma_addr { struct rdma_dev_addr dev_addr; }; +#define RDMA_PRIMARY_PATH_MAX_REC_NUM 3 struct rdma_route { struct rdma_addr addr; struct sa_path_rec *path_rec; + + /* Optional path records of primary path */ + struct sa_path_rec *path_rec_inbound; + struct sa_path_rec *path_rec_outbound; + /* * 0 - No primary nor alternate path is available * 1 - Only primary path is available |