[RFC][Focal][PATCH 0/2] Add IB peer memory interface
Tim Gardner
tim.gardner at canonical.com
Tue Aug 31 11:46:10 UTC 2021
On 8/30/21 4:50 PM, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/1923104
>
> This is a backport of a SAUCE patch we're already carrying in hirsute[*].
> In a conversation w/ Terry, he mentioned that he'd like to see some amount
> of real world functional testing be completed before we'd consider SRU'ing
> to other kernels. That testing will take some scheduling/engineering effort
> so, in order to minimize the risk of respins/retests, I'm submitting this as
> an RFC. My goal here is to try and fish out any aspects of this patch that
> are likely to get NAK'd - even if testing were to pass.
>
> Note: Going back to 5.4 requires backporting an additional upstream patch,
> which changes the API of an exported symbol (ib_umem_get). The only out
> of tree modules of which I'm aware that use this symbol are the Mellanox
> OFED drivers, but they also bundle their own ib_core module that overrides
> the ib_umem_get interface we provide, so they aren't directly impacted.
> Of course, we can't rule out other users.
>
> [*] https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/hirsute/commit/?id=e9eb90eb5e4a5aef6f516abbc720038fc0d1a139
>
> Feras Daoud (1):
> RDMA/core: Introduce peer memory interface
>
> Moni Shoua (1):
> IB: Allow calls to ib_umem_get from kernel ULPs
>
> drivers/infiniband/core/Makefile | 2 +-
> drivers/infiniband/core/ib_peer_mem.h | 52 ++
> drivers/infiniband/core/peer_mem.c | 484 ++++++++++++++++++
> drivers/infiniband/core/umem.c | 69 ++-
> drivers/infiniband/core/umem_odp.c | 33 +-
> drivers/infiniband/hw/bnxt_re/ib_verbs.c | 12 +-
> drivers/infiniband/hw/cxgb3/iwch_provider.c | 2 +-
> drivers/infiniband/hw/cxgb4/mem.c | 2 +-
> drivers/infiniband/hw/efa/efa_verbs.c | 2 +-
> drivers/infiniband/hw/hns/hns_roce_cq.c | 2 +-
> drivers/infiniband/hw/hns/hns_roce_db.c | 3 +-
> drivers/infiniband/hw/hns/hns_roce_mr.c | 4 +-
> drivers/infiniband/hw/hns/hns_roce_qp.c | 2 +-
> drivers/infiniband/hw/hns/hns_roce_srq.c | 5 +-
> drivers/infiniband/hw/i40iw/i40iw_verbs.c | 2 +-
> drivers/infiniband/hw/mlx4/cq.c | 2 +-
> drivers/infiniband/hw/mlx4/doorbell.c | 3 +-
> drivers/infiniband/hw/mlx4/mr.c | 8 +-
> drivers/infiniband/hw/mlx4/qp.c | 5 +-
> drivers/infiniband/hw/mlx4/srq.c | 3 +-
> drivers/infiniband/hw/mlx5/cq.c | 11 +-
> drivers/infiniband/hw/mlx5/devx.c | 2 +-
> drivers/infiniband/hw/mlx5/doorbell.c | 3 +-
> drivers/infiniband/hw/mlx5/mem.c | 11 +-
> drivers/infiniband/hw/mlx5/mr.c | 60 ++-
> drivers/infiniband/hw/mlx5/odp.c | 2 +-
> drivers/infiniband/hw/mlx5/qp.c | 4 +-
> drivers/infiniband/hw/mlx5/srq.c | 2 +-
> drivers/infiniband/hw/mthca/mthca_provider.c | 2 +-
> drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 2 +-
> drivers/infiniband/hw/qedr/verbs.c | 9 +-
> drivers/infiniband/hw/vmw_pvrdma/pvrdma_cq.c | 2 +-
> drivers/infiniband/hw/vmw_pvrdma/pvrdma_mr.c | 2 +-
> drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c | 7 +-
> drivers/infiniband/hw/vmw_pvrdma/pvrdma_srq.c | 2 +-
> drivers/infiniband/sw/rdmavt/mr.c | 2 +-
> drivers/infiniband/sw/rxe/rxe_mr.c | 2 +-
> include/rdma/ib_umem.h | 33 +-
> include/rdma/ib_umem_odp.h | 9 +-
> include/rdma/peer_mem.h | 165 ++++++
> 40 files changed, 908 insertions(+), 121 deletions(-)
> create mode 100644 drivers/infiniband/core/ib_peer_mem.h
> create mode 100644 drivers/infiniband/core/peer_mem.c
> create mode 100644 include/rdma/peer_mem.h
>
Hi Dann,
If this was being submitted for real then I'd like a bit more
explanation about what use cases this patch addresses. Is it a ginormous
performance gain ? Who is requesting this feature ? This is a lot of
code, so its gonna need some pretty solid justification for a stable
kernel that we have to maintain for next N years.
As a backport, patch 1 could use some explanation about what were the
conflicts and how were they resolved. Did it require major sugery ?
Patch 2 is missing provenance. 'Change-Id:
I1d77f52d56aec2c79e6b9d9ec1096e83a95155cd' doesn't mean much to this
list. Did this come from Hirsute as well ? Should it be a SAUCE patch ?
rtg
-----------
Tim Gardner
Canonical, Inc
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