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working on smbdirect cleanup I'm using siw.ko for > testing against Windows using Chelsio T404-BT (only supporting MPA V1) > and T520-BT (supporting MPA V2) cards. > > Up to now I used old patches to add MPA V1 support > to siw.ko and compiled against the running kernel > each time. I don't want to do that forever, so > I re-introduced module parameters in order to > avoid patching and compiling. > > For my testing I'm using something like this: > > echo 1 > /sys/module/siw/parameters/mpa_crc_required > echo 1 > /sys/module/siw/parameters/mpa_crc_strict > echo 0 > /sys/module/siw/parameters/mpa_rdma_write_rtr > echo 1 > /sys/module/siw/parameters/mpa_peer_to_peer > > echo 1 > /sys/module/siw/parameters/mpa_version > rdma link add siw_v1_eth0 type siw netdev eth0 > > echo 2 > /sys/module/siw/parameters/mpa_version > rdma link add siw_v2_eth1 type siw netdev eth1 > > The global parameters are copied at 'rdma link add' time > and will stay as is for the lifetime of the specific device. > > So I can testing against the T520-BT card using siw_v2_eth1 > and against the T404-BT card using siw_v1_eth0. > > It would be great if this can go upstream. > > Stefan Metzmacher (8): > RDMA/siw: make mpa_version = MPA_REVISION_2 const > RDMA/siw: remove unused loopback_enabled = true > RDMA/siw: add and remember siw_device_options per device. > RDMA/siw: make use of sdev->options.* and avoid globals > RDMA/siw: combine global options into siw_default_options > RDMA/siw: move rtr_type to siw_device_options > RDMA/siw: [re-]introduce module parameters to alter the behavior at > runtime > RDMA/siw: add support for MPA V1 and IRD/ORD negotiation based on > [MS-SMBD] > > drivers/infiniband/sw/siw/iwarp.h | 8 + > drivers/infiniband/sw/siw/siw.h | 21 +- > drivers/infiniband/sw/siw/siw_cm.c | 268 +++++++++++++++++++++----- > drivers/infiniband/sw/siw/siw_cm.h | 2 + > drivers/infiniband/sw/siw/siw_main.c | 173 ++++++++++++++--- > drivers/infiniband/sw/siw/siw_qp_tx.c | 3 +- > drivers/infiniband/sw/siw/siw_verbs.c | 2 +- > 7 files changed, 395 insertions(+), 82 deletions(-) > Without addressing the question of whether siw should implement MPAv1, I would like to request a user interface that is more friendly to containers and to automation (CI). I know there is plenty of precedent for "pull in the current setting of some random global module parameter", but I don't think that is up to today's most common deployment scenarios. Surely rxe will also need to have a similar switch between RoCEv1 and RoCEv2? Could something be added in the "rdma" tool to make this a per- device protocol version setting? -- Chuck Lever