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| author |   Honggang Li <honli@redhat.com> | 2019-09-28 01:43:51 +0800 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2019-10-08 15:17:32 -0300 |
| commit | 547ed331bbe89575ff91939e1ac9a023fe526b74 (patch) | |
| tree | 601b7c0e9341eb4d2bfdb05f7896336a53c1d393 /drivers/infiniband/ulp/srp/ib_srp.h | |
| parent | IB/cm: Use container_of() instead of typecast (diff) | |
| download | linux-dev-547ed331bbe89575ff91939e1ac9a023fe526b74.tar.xz linux-dev-547ed331bbe89575ff91939e1ac9a023fe526b74.zip | |
RDMA/srp: Add parse function for maximum initiator to target IU size
According to SRP specifications 'srp-r16a' and 'srp2r06',
IOControllerProfile attributes for SRP target port include the maximum
initiator to target IU size.
SRP connection daemons, such as srp_daemon, can get the value from the
subnet manager. The SRP connection daemon can pass this value to kernel.
This patch adds a parse function for it.
Upstream commit [1] enables the kernel parameter, 'use_imm_data', by
default. [1] also use (8 * 1024) as the default value for kernel parameter
'max_imm_data'. With those default values, the maximum initiator to target
IU size will be 8260.
In case the SRPT modules, which include the in-tree 'ib_srpt.ko' module,
do not support SRP-2 'immediate data' feature, the default maximum
initiator to target IU size is significantly smaller than 8260. For
'ib_srpt.ko' module, which built from source before [2], the default
maximum initiator to target IU is 2116.
[1] introduces a regression issue for old srp targets with default kernel
parameters, as the connection will be rejected because of a too large
maximum initiator to target IU size.
[1] commit 882981f4a411 ("RDMA/srp: Add support for immediate data")
[2] commit 5dabcd0456d7 ("RDMA/srpt: Add support for immediate data")
Link: https://lore.kernel.org/r/20190927174352.7800-1-honli@redhat.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Honggang Li <honli@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index f38fbb00d0e8..5359ece561ca 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -210,6 +210,7 @@ struct srp_target_port { u32 ch_count; u32 lkey; enum srp_target_state state; + uint32_t max_it_iu_size; unsigned int cmd_sg_cnt; unsigned int indirect_size; bool allow_ext_sg; |