Commit 3a98ea70 authored by Gioh Kim's avatar Gioh Kim Committed by Jason Gunthorpe
Browse files

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.com


Signed-off-by: default avatarGioh Kim <gi-oh.kim@ionos.com>
Signed-off-by: default avatarJack Wang <jinpu.wang@ionos.com>
Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent 485f2fb1

drivers/infiniband/ulp/rtrs/rtrs-pri.h

+8 −5
Original line number Diff line number Diff line
@@ -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,