Re: [PATCH] IB/srp: Fix possible send queue overflow

[Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>]

On 10/15/2015 02:26 AM, Sagi Grimberg wrote:
> When using work request based memory registration (fast_reg)
> we must reserve SQ entries for registration and invalidation
> in addition to send operations. Each IO consumes 3 SQ entries
> (registration, send, invalidation) so we need to allocate 3x
> larger send-queue instead of 2x.
>
> Signed-off-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> CC: Stable <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> ---
>   drivers/infiniband/ulp/srp/ib_srp.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
> index d00f819..43b07f7 100644
> --- a/drivers/infiniband/ulp/srp/ib_srp.c
> +++ b/drivers/infiniband/ulp/srp/ib_srp.c
> @@ -488,7 +488,7 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
>   	struct ib_qp *qp;
>   	struct ib_fmr_pool *fmr_pool = NULL;
>   	struct srp_fr_pool *fr_pool = NULL;
> -	const int m = 1 + dev->use_fast_reg;
> +	const int m = dev->use_fast_reg ? 3 : 1;
>   	struct ib_cq_init_attr cq_attr = {};
>   	int ret;
>

Reviewed-by: Bart Van Assche <bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
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