On 05/04/2016 10:43 AM, Chuck Lever wrote:
> The kernel NFS client specifies 'rdma' as the transport protocol for
> NFS/RDMA mounts. This is a generic display token, probably not
> something the kernel should lie about. The kernel uses it to form
> NFSv4 client IDs, for example.
>
> Until gssd can speak RPC-over-RDMA, convert 'rdma' to 'tcp' in
> kernel gss upcalls.
>
> This means that the Linux NFS client requires an NFS/TCP service on
> an NFS/RDMA server when establishing a GSS context for proto=rdma
> mount points. This is probably not an onerous requirement for the
> time being.
>
> Eventually user space support for RPC-over-RDMA might be introduced,
> and gssd can use that for context establishment.
Shouldn't we log something tell to the user this is happening??
steved.
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> utils/gssd/gssd.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/utils/gssd/gssd.c b/utils/gssd/gssd.c
> index 7ba27b1..51b2cd7 100644
> --- a/utils/gssd/gssd.c
> +++ b/utils/gssd/gssd.c
> @@ -301,6 +301,22 @@ gssd_read_service_info(int dirfd, struct clnt_info *clp)
> goto fail;
> }
>
> + /*
> + * The user space RPC library has no support for
> + * RPC-over-RDMA at this time, so change 'rdma'
> + * to 'tcp', and '20049' to '2049'.
> + */
> + if (strcmp(protoname, "rdma") == 0) {
> + free(protoname);
> + protoname = strdup("tcp");
> + if (!protoname)
> + goto fail;
> + free(port);
> + port = strdup("2049");
> + if (!port)
> + goto fail;
> + }
> +
> if (!gssd_addrstr_to_sockaddr((struct sockaddr *)&clp->addr,
> address, port ? port : ""))
> goto fail;
>
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