Re: [Qemu-devel] [PATCH] hw/pvrdma: Post CQE when receive invalid gid index

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

Hi Yuval,

On 1/9/19 10:15 PM, Yuval Shaia wrote:
> This error should propagate back to guest.
>
> Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
> ---
>   hw/rdma/rdma_backend.h      | 1 +
>   hw/rdma/vmw/pvrdma_qp_ops.c | 6 ++++--
>   2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/hw/rdma/rdma_backend.h b/hw/rdma/rdma_backend.h
> index a9ba40ae48..5114c90e67 100644
> --- a/hw/rdma/rdma_backend.h
> +++ b/hw/rdma/rdma_backend.h
> @@ -32,6 +32,7 @@
>   #define VENDOR_ERR_INVLKEY          0x207
>   #define VENDOR_ERR_MR_SMALL         0x208
>   #define VENDOR_ERR_INV_MAD_BUFF     0x209
> +#define VENDOR_ERR_INV_GID_IDX      0x210
>   
>   /* Add definition for QP0 and QP1 as there is no userspace enums for them */
>   enum ibv_special_qp_type {
> diff --git a/hw/rdma/vmw/pvrdma_qp_ops.c b/hw/rdma/vmw/pvrdma_qp_ops.c
> index 465bee8641..0565eba981 100644
> --- a/hw/rdma/vmw/pvrdma_qp_ops.c
> +++ b/hw/rdma/vmw/pvrdma_qp_ops.c
> @@ -178,7 +178,8 @@ int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle)
>           sgid = rdma_rm_get_gid(&dev->rdma_dev_res, wqe->hdr.wr.ud.av.gid_index);
>           if (!sgid) {
>               pr_dbg("Fail to get gid for idx %d\n", wqe->hdr.wr.ud.av.gid_index);
> -            return -EIO;
> +            complete_with_error(VENDOR_ERR_INV_GID_IDX, comp_ctx);

There may be a problem here, comp_ctx may be uninitialized at this point.
I see that comp_ctx gets initalized after this call:

          /* Prepare CQE */
         comp_ctx = g_malloc(sizeof(CompHandlerCtx));
         comp_ctx->dev = dev;


What do you think?

Thanks,
Marcel

> +            continue;
>           }
>           pr_dbg("sgid_id=%d, sgid=0x%llx\n", wqe->hdr.wr.ud.av.gid_index,
>                  sgid->global.interface_id);
> @@ -189,7 +190,8 @@ int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle)
>           if (sgid_idx <= 0) {
>               pr_dbg("Fail to get bk sgid_idx for sgid_idx %d\n",
>                      wqe->hdr.wr.ud.av.gid_index);
> -            return -EIO;
> +            complete_with_error(VENDOR_ERR_INV_GID_IDX, comp_ctx);
> +            continue;
>           }
>   
>           if (wqe->hdr.num_sge > dev->dev_attr.max_sge) {