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From: Bob Pearson <rpearsonhpe@gmail.com>
To: jgg@nvidia.com, zyjzyj2000@gmail.com, linux-rdma@vger.kernel.org
Cc: Bob Pearson <rpearsonhpe@gmail.com>
Subject: [PATCH for-next v3 0/5] Replace AV by AH in UD sends
Date: Thu, 22 Jul 2021 16:22:39 -0500	[thread overview]
Message-ID: <20210722212244.412157-1-rpearsonhpe@gmail.com> (raw)

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.

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


             reply	other threads:[~2021-07-22 21:23 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 21:22 Bob Pearson [this message]
2021-07-22 21:22 ` [PATCH v3 1/6] RDMA/rxe: Move AV from rxe_send_wqe to rxe_send_wr Bob Pearson
2021-07-22 21:22 ` [PATCH v3 2/6] RDMA/rxe: Change AH objects to indexed Bob Pearson
2021-07-22 21:22 ` [PATCH v3 3/6] RDMA/rxe: Create AH index and return to user space Bob Pearson
2021-08-27 12:51   ` Jason Gunthorpe
2021-07-22 21:22 ` [PATCH v3 4/6] RDMA/rxe: Replace ah->pd by ah->ibah.pd Bob Pearson
2021-07-22 21:22 ` [PATCH v3 5/6] RDMA/rxe: Lookup kernel AH from ah index in UD WQEs Bob Pearson
2021-08-27 12:53   ` Jason Gunthorpe
2021-07-22 21:22 ` [PATCH v3 6/6] RDMA/rxe: Convert kernel UD post send to use ah_num Bob Pearson

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