/**
* svc_rdma_xdr_decode_req - Parse incoming RPC-over-RDMA header
* @rq_arg: Receive buffer
*
* On entry, xdr->head[0].iov_base points to first byte in the
* RPC-over-RDMA header.
*
* On successful exit, head[0] points to first byte past the
* RPC-over-RDMA header. For RDMA_MSG, this is the RPC message.
* The length of the RPC-over-RDMA header is returned.
*/
int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
{
__be32 *p, *end, *rdma_argp;
unsigned int hdr_len;
/* Verify that there's enough bytes for header + something */
if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
goto out_short;
rdma_argp = rq_arg->head[0].iov_base;
if (*(rdma_argp + 1) != rpcrdma_version)
goto out_version;
switch (*(rdma_argp + 3)) {
case rdma_msg:
case rdma_nomsg:
break;
case rdma_done:
goto out_drop;
case rdma_error:
goto out_drop;
default:
goto out_proc;
}
end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
p = xdr_check_read_list(rdma_argp + 4, end);
if (!p)
goto out_inval;
p = xdr_check_write_list(p, end);
if (!p)
goto out_inval;
p = xdr_check_reply_chunk(p, end);
if (!p)
goto out_inval;
if (p > end)
goto out_inval;
rq_arg->head[0].iov_base = p;
hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
rq_arg->head[0].iov_len -= hdr_len;
return hdr_len;
out_short:
dprintk("svcrdma: header too short = %d\n", rq_arg->len);
return -EINVAL;
out_version:
dprintk("svcrdma: bad xprt version: %u\n",
be32_to_cpup(rdma_argp + 1));
return -EPROTONOSUPPORT;
out_drop:
dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n");
return 0;
out_proc:
dprintk("svcrdma: bad rdma procedure (%u)\n",
be32_to_cpup(rdma_argp + 3));
return -EINVAL;
out_inval:
dprintk("svcrdma: failed to parse transport header\n");
return -EINVAL;
}
/* On entry, xdr->head[0].iov_base points to first byte in the
* RPC-over-RDMA header.
*
* On successful exit, head[0] points to first byte past the
* RPC-over-RDMA header. For RDMA_MSG, this is the RPC message.
* The length of the RPC-over-RDMA header is returned.
*
* Assumptions:
* - The transport header is entirely contained in the head iovec.
*/
static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
{
__be32 *p, *end, *rdma_argp;
unsigned int hdr_len;
/* Verify that there's enough bytes for header + something */
if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
goto out_short;
rdma_argp = rq_arg->head[0].iov_base;
if (*(rdma_argp + 1) != rpcrdma_version)
goto out_version;
switch (*(rdma_argp + 3)) {
case rdma_msg:
break;
case rdma_nomsg:
break;
case rdma_done:
goto out_drop;
case rdma_error:
goto out_drop;
default:
goto out_proc;
}
end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
p = xdr_check_read_list(rdma_argp + 4, end);
if (!p)
goto out_inval;
p = xdr_check_write_list(p, end);
if (!p)
goto out_inval;
p = xdr_check_reply_chunk(p, end);
if (!p)
goto out_inval;
if (p > end)
goto out_inval;
rq_arg->head[0].iov_base = p;
hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
rq_arg->head[0].iov_len -= hdr_len;
rq_arg->len -= hdr_len;
trace_svcrdma_decode_rqst(rdma_argp, hdr_len);
return hdr_len;
out_short:
trace_svcrdma_decode_short(rq_arg->len);
return -EINVAL;
out_version:
trace_svcrdma_decode_badvers(rdma_argp);
return -EPROTONOSUPPORT;
out_drop:
trace_svcrdma_decode_drop(rdma_argp);
return 0;
out_proc:
trace_svcrdma_decode_badproc(rdma_argp);
return -EINVAL;
out_inval:
trace_svcrdma_decode_parse(rdma_argp);
return -EINVAL;
}
