提交 3a98ea70 编写于 作者: G Gioh Kim 提交者: Jason Gunthorpe

RDMA/rtrs: Change MAX_SESS_QUEUE_DEPTH

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.comSigned-off-by: NGioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: NJack Wang <jinpu.wang@ionos.com>
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
上级 485f2fb1
......@@ -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,
......
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