Re: [PATCH] RDMA/rxe: Fix responder length checking for UD request packets

[Leon Romanovsky <leon@kernel.org>]

On Fri, Jun 07, 2024 at 10:57:12AM +0200, Zhu Yanjun wrote:
> 
> On 30.05.24 16:17, Leon Romanovsky wrote:
> > On Thu, 23 May 2024 17:46:17 +0800, Honggang LI wrote:
> > > According to the IBA specification:
> > > If a UD request packet is detected with an invalid length, the request
> > > shall be an invalid request and it shall be silently dropped by
> > > the responder. The responder then waits for a new request packet.
> > > 
> > > commit 689c5421bfe0 ("RDMA/rxe: Fix incorrect responder length checking")
> > > defers responder length check for UD QPs in function `copy_data`.
> > > But it introduces a regression issue for UD QPs.
> > > 
> > > [...]
> > Applied, thanks!
> > 
> > [1/1] RDMA/rxe: Fix responder length checking for UD request packets
> >        https://git.kernel.org/rdma/rdma/c/05301cb42a5567
> 
> Hi, Leon
> 
> When I built this commit with gcc (Debian 8.3.0-6) 8.3.0, the following
> warnings will pop out.

Thanks, I fixed it in my tree.

> 
> "
> drivers/infiniband/sw/rxe/rxe_resp.c: In function ‘rxe_resp_check_length’:
> drivers/infiniband/sw/rxe/rxe_resp.c:401:3: error: ‘for’ loop initial
> declarations are only allowed in C99 or C11 mode
>    for (int i = 0; i < qp->resp.wqe->dma.num_sge; i++)
>    ^~~
> drivers/infiniband/sw/rxe/rxe_resp.c:401:3: note: use option -std=c99,
> -std=gnu99, -std=c11 or -std=gnu11 to compile your code
> "
> 
> The following diff will fix this problem.
> 
> "
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c
> b/drivers/infiniband/sw/rxe/rxe_resp.c
> index ad3c7bf76752..6596a85723c9 100644
> --- a/drivers/infiniband/sw/rxe/rxe_resp.c
> +++ b/drivers/infiniband/sw/rxe/rxe_resp.c
> @@ -345,10 +345,11 @@ static enum resp_states rxe_resp_check_length(struct
> rxe_qp *qp,
>          * length checks are performed in check_rkey.
>          */
>         if ((qp_type(qp) == IB_QPT_GSI) || (qp_type(qp) == IB_QPT_UD)) {
> -               unsigned int recv_buffer_len = 0;
>                 unsigned int payload = payload_size(pkt);
> +               unsigned int recv_buffer_len = 0;
> +               int i;
> 
> -               for (int i = 0; i < qp->resp.wqe->dma.num_sge; i++)
> +               for (i = 0; i < qp->resp.wqe->dma.num_sge; i++)
>                         recv_buffer_len += qp->resp.wqe->dma.sge[i].length;
>                 if (payload + 40 > recv_buffer_len) {
>                         rxe_dbg_qp(qp, "The receive buffer is too small for
> this UD packet.\n");
> 
> "
> 
> Zhu Yanjun
> 
> > 
> > Best regards,
> 
> -- 
> Best Regards,
> Yanjun.Zhu
>