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Date:   Sun, 26 Apr 2020 10:37:45 +0300
From:   Maor Gottlieb <maorg@...lanox.com>
To:     davem@...emloft.net, jgg@...lanox.com, dledford@...hat.com,
        j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
        kuba@...nel.org, jiri@...lanox.com, dsahern@...nel.org
Cc:     leonro@...lanox.com, saeedm@...lanox.com,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        alexr@...lanox.com
Subject: Re: [PATCH 00/16] Add support to get xmit slave

This is V6 and should have mlx5-next in the title (all the other patches 
have it).

On 4/26/2020 10:17 AM, Maor Gottlieb wrote:
> Hi Dave,
>
> This series is a combination of netdev and RDMA, so in order to avoid
> conflicts, we would like to ask you to route this series through
> mlx5-next shared branch. It is based on v5.7-rc1 tag.
>
> ---------------------------------------------------------------------
>
> The following series adds support to get the LAG master xmit slave by
> introducing new .ndo - ndo_get_xmit_slave. Every LAG module can
> implement it and it first implemented in the bond driver.
> This is follow-up to the RFC discussion [1].
>
> The main motivation for doing this is for drivers that offload part
> of the LAG functionality. For example, Mellanox Connect-X hardware
> implements RoCE LAG which selects the TX affinity when the resources
> are created and port is remapped when it goes down.
>
> The first part of this patchset introduces the new .ndo and add the
> support to the bonding module.
>
> The second part adds support to get the RoCE LAG xmit slave by building
> skb of the RoCE packet based on the AH attributes and call to the new
> .ndo.
>
> The third part change the mlx5 driver driver to set the QP's affinity
> port according to the slave which found by the .ndo.
>
> Thanks
>
> [1]
> https://lore.kernel.org/netdev/20200126132126.9981-1-maorg@xxxxxxxxxxxx/
>
> Change log:
> v6: patch 1 - Fix commit message and add function description.
>      patch 10 - Keep udata as function argument.
> v5: patch 1 - Remove rcu lock.
>      patch 10 - Refactor patch that group the AH attributes in struct.
>      patch 11 - call the ndo while holding the rcu and initialize xmit_slave.
>      patch 12 - Store the xmit slave in rdma_ah_init_attr and qp_attr.
>
> v4: 1. Rename master_get_xmit_slave to netdev_get_xmit_slave and move
> the implementation to dev.c
>      2. Remove unnecessary check of NULL pointer.
>      3. Fix typo.
> v3: 1. Move master_get_xmit_slave to netdevice.h and change the flags
> arg.
> to bool.
>      2. Split helper functions commit to multiple commits for each bond
> mode.
>      3. Extract refcotring changes to seperate commits.
> v2: The first patch wasn't sent in v1.
> v1:
> https://lore.kernel.org/netdev/ac373456-b838-29cf-645f-b1ea1a93e3b0@xxxxxxxxx/T/#t
>
> Maor Gottlieb (16):
>    net/core: Introduce netdev_get_xmit_slave
>    bonding: Export skip slave logic to function
>    bonding: Rename slave_arr to usable_slaves
>    bonding/alb: Add helper functions to get the xmit slave
>    bonding: Add helper function to get the xmit slave based on hash
>    bonding: Add helper function to get the xmit slave in rr mode
>    bonding: Add function to get the xmit slave in active-backup mode
>    bonding: Add array of all slaves
>    bonding: Implement ndo_get_xmit_slave
>    RDMA: Group create AH arguments in struct
>    RDMA/core: Add LAG functionality
>    RDMA/core: Get xmit slave for LAG
>    net/mlx5: Change lag mutex lock to spin lock
>    net/mlx5: Add support to get lag physical port
>    RDMA/mlx5: Refactor affinity related code
>    RDMA/mlx5: Set lag tx affinity according to slave
>
>   drivers/infiniband/core/Makefile              |   2 +-
>   drivers/infiniband/core/lag.c                 | 141 +++++++++
>   drivers/infiniband/core/verbs.c               |  58 ++--
>   drivers/infiniband/hw/bnxt_re/ib_verbs.c      |   8 +-
>   drivers/infiniband/hw/bnxt_re/ib_verbs.h      |   2 +-
>   drivers/infiniband/hw/efa/efa.h               |   3 +-
>   drivers/infiniband/hw/efa/efa_verbs.c         |   6 +-
>   drivers/infiniband/hw/hns/hns_roce_ah.c       |   5 +-
>   drivers/infiniband/hw/hns/hns_roce_device.h   |   4 +-
>   drivers/infiniband/hw/mlx4/ah.c               |  11 +-
>   drivers/infiniband/hw/mlx4/mlx4_ib.h          |   2 +-
>   drivers/infiniband/hw/mlx5/ah.c               |  14 +-
>   drivers/infiniband/hw/mlx5/gsi.c              |  34 ++-
>   drivers/infiniband/hw/mlx5/main.c             |   2 +
>   drivers/infiniband/hw/mlx5/mlx5_ib.h          |   3 +-
>   drivers/infiniband/hw/mlx5/qp.c               | 122 +++++---
>   drivers/infiniband/hw/mthca/mthca_provider.c  |   9 +-
>   drivers/infiniband/hw/ocrdma/ocrdma_ah.c      |   3 +-
>   drivers/infiniband/hw/ocrdma/ocrdma_ah.h      |   2 +-
>   drivers/infiniband/hw/qedr/verbs.c            |   4 +-
>   drivers/infiniband/hw/qedr/verbs.h            |   2 +-
>   .../infiniband/hw/vmw_pvrdma/pvrdma_verbs.c   |   5 +-
>   .../infiniband/hw/vmw_pvrdma/pvrdma_verbs.h   |   2 +-
>   drivers/infiniband/sw/rdmavt/ah.c             |  11 +-
>   drivers/infiniband/sw/rdmavt/ah.h             |   4 +-
>   drivers/infiniband/sw/rxe/rxe_verbs.c         |   9 +-
>   drivers/net/bonding/bond_alb.c                |  39 ++-
>   drivers/net/bonding/bond_main.c               | 268 +++++++++++++-----
>   drivers/net/ethernet/mellanox/mlx5/core/lag.c |  66 +++--
>   include/linux/mlx5/driver.h                   |   2 +
>   include/linux/mlx5/mlx5_ifc.h                 |   4 +-
>   include/linux/mlx5/qp.h                       |   2 +
>   include/linux/netdevice.h                     |  12 +
>   include/net/bond_alb.h                        |   4 +
>   include/net/bonding.h                         |   3 +-
>   include/rdma/ib_verbs.h                       |  12 +-
>   include/rdma/lag.h                            |  23 ++
>   net/core/dev.c                                |  22 ++
>   38 files changed, 696 insertions(+), 229 deletions(-)
>   create mode 100644 drivers/infiniband/core/lag.c
>   create mode 100644 include/rdma/lag.h
>

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