lkml.org 
[lkml]   [2021]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH AUTOSEL 5.13 057/189] RDMA/rtrs: Change MAX_SESS_QUEUE_DEPTH
    Date
    From: Gioh Kim <gi-oh.kim@cloud.ionos.com>

    [ 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>
    ---
    drivers/infiniband/ulp/rtrs/rtrs-pri.h | 13 ++++++++-----
    1 file changed, 8 insertions(+), 5 deletions(-)

    diff --git a/drivers/infiniband/ulp/rtrs/rtrs-pri.h b/drivers/infiniband/ulp/rtrs/rtrs-pri.h
    index 86e65cf30cab..d957bbf1ddd3 100644
    --- a/drivers/infiniband/ulp/rtrs/rtrs-pri.h
    +++ b/drivers/infiniband/ulp/rtrs/rtrs-pri.h
    @@ -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,
    --
    2.30.2
    \
     
     \ /
      Last update: 2021-07-06 13:40    [W:3.385 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site