On 15/12/2022 18:14, Daisuke Matsuda wrote:
> If you create MRs more than 0x10000 times after loading the module,
> responder starts to reply NAKs for RDMA/Atomic operations because of rkey
> violation detected in check_rkey(). The root cause is that rkeys are
> incremented each time a new MR is created and the value overflows into the
> range reserved for MWs.
>
> Fixes: 0994a1bcd5f7 ("RDMA/rxe: Bump up default maximum values used via uverbs")
> Signed-off-by: Daisuke Matsuda <matsuda-daisuke@xxxxxxxxxxx>
> ---
> drivers/infiniband/sw/rxe/rxe_param.h | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_param.h b/drivers/infiniband/sw/rxe/rxe_param.h
> index a754fc902e3d..a3d31bd45895 100644
> --- a/drivers/infiniband/sw/rxe/rxe_param.h
> +++ b/drivers/infiniband/sw/rxe/rxe_param.h
> @@ -98,10 +98,10 @@ enum rxe_device_param {
> RXE_MAX_SRQ = DEFAULT_MAX_VALUE - RXE_MIN_SRQ_INDEX,
>
> RXE_MIN_MR_INDEX = 0x00000001,
> - RXE_MAX_MR_INDEX = DEFAULT_MAX_VALUE,
> - RXE_MAX_MR = DEFAULT_MAX_VALUE - RXE_MIN_MR_INDEX,
> - RXE_MIN_MW_INDEX = 0x00010001,
> - RXE_MAX_MW_INDEX = 0x00020000,
> + RXE_MAX_MR_INDEX = DEFAULT_MAX_VALUE >> 1,
> + RXE_MAX_MR = 0x00001000,
May i know why the RXE_MAX_MR isn't (RXE_MAX_MR_INDEX - RXE_MIN_MR_INDEX)
0x00001000 is much less than previous value
> + RXE_MIN_MW_INDEX = (DEFAULT_MAX_VALUE >> 1) + 1,
> + RXE_MAX_MW_INDEX = DEFAULT_MAX_VALUE,
> RXE_MAX_MW = 0x00001000,
>
> RXE_MAX_PKT_PER_ACK = 64,
