Currently the rdma_rxe driver and its user space provider exchange
addressing information for UD sends by having the provider compute an
address vector (AV) and send it with each WQE. This is not the way
that the RDMA verbs API was intended to operate.
This series of patches modifies the way UD send WQEs work by exchanging
an index identifying the AH replacing the 88 byte AV by a 4 byte AH
index. In order to not break compatibility with the existing API the
rdma_rxe driver will recognise when an older version of the provider
is not sending an index (i.e. it is 0) and will use the AV instead.
This series of patches is almost identical to an earlier version
but rebased to 5.15.0-rc1+. It applies cleanly to
450f4f6aa1a369cc3ffadc1c7e27dfab3e90199f (for-next)
v4:
Rebase to 5.15.0-rc1+
v3:
Split up commits into smaller steps.
v2:
Rearranged AV in rxe_send_wqe to be in the ud struct but padded to the
same offset as the original preserving ABI compatibility.
Bob Pearson (6):
RDMA/rxe: Move AV from rxe_send_wqe to rxe_send_wr
RDMA/rxe: Change AH objects to indexed
RDMA/rxe: Create AH index and return to user space
RDMA/rxe: Replace ah->pd by ah->ibah.pd
RDMA/rxe: Lookup kernel AH from ah index in UD WQEs
RDMA/rxe: Convert kernel UD post send to use ah_num
drivers/infiniband/sw/rxe/rxe_av.c | 20 +++++++++++++-
drivers/infiniband/sw/rxe/rxe_param.h | 4 ++-
drivers/infiniband/sw/rxe/rxe_pool.c | 4 ++-
drivers/infiniband/sw/rxe/rxe_req.c | 8 +++---
drivers/infiniband/sw/rxe/rxe_verbs.c | 39 ++++++++++++++++++++++-----
drivers/infiniband/sw/rxe/rxe_verbs.h | 8 +++++-
include/uapi/rdma/rdma_user_rxe.h | 10 ++++++-
7 files changed, 79 insertions(+), 14 deletions(-)
--
2.30.2
