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RDMA/rtrs: Change MAX_SESS_QUEUE_DEPTH

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[ Upstream commit 3a98ea7041b7d18ac356da64823c2ba2f8391b3e ]

Max IB immediate data size is 2^28 (MAX_IMM_PAYL_BITS)
and the minimum chunk size is 4096 (2^12).
Therefore the maximum sess_queue_depth is 65536 (2^16).

Link: https://lore.kernel.org/r/20210528113018.52290-6-jinpu.wang@ionos.com
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gioh Kim 2021-05-28 13:30:03 +02:00 committed by Greg Kroah-Hartman
parent 4f6a0f31c6
commit 315988817a
1 changed files with 8 additions and 5 deletions
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13
drivers/infiniband/ulp/rtrs/rtrs-pri.h
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@ -47,12 +47,15 @@ enum {
MAX_PATHS_NUM = 128,
/*
* With the size of struct rtrs_permit allocated on the client, 4K
* is the maximum number of rtrs_permits we can allocate. This number is
* also used on the client to allocate the IU for the user connection
* to receive the RDMA addresses from the server.
* Max IB immediate data size is 2^28 (MAX_IMM_PAYL_BITS)
* and the minimum chunk size is 4096 (2^12).
* So the maximum sess_queue_depth is 65536 (2^16) in theory.
* But mempool_create, create_qp and ib_post_send fail with
* "cannot allocate memory" error if sess_queue_depth is too big.
* Therefore the pratical max value of sess_queue_depth is
* somewhere between 1 and 65536 and it depends on the system.
*/
MAX_SESS_QUEUE_DEPTH = 4096,
MAX_SESS_QUEUE_DEPTH = 65536,
RTRS_HB_INTERVAL_MS = 5000,
RTRS_HB_MISSED_MAX = 5,