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xprtrdma: Set up an xdr_stream in rpcrdma_marshal_req()

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Initialize an xdr_stream at the top of rpcrdma_marshal_req(), and
use it to encode the fixed transport header fields. This xdr_stream
will be used to encode the chunk lists in a subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-08-10 12:47:28 -04:00 committed by Anna Schumaker
parent f4a2805e7d
commit 7a80f3f0dd
3 changed files with 21 additions and 6 deletions
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24
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -667,17 +667,20 @@ rpcrdma_unmap_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
* %-ENOTCONN if the connection was lost,
* %-EAGAIN if not enough pages are available for on-demand reply buffer,
* %-ENOBUFS if no MRs are available to register chunks,
* %-EMSGSIZE if the transport header is too small,
* %-EIO if a permanent problem occurred while marshaling.
*/
int
rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
{
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
struct xdr_stream *xdr = &req->rl_stream;
enum rpcrdma_chunktype rtype, wtype;
struct rpcrdma_msg *headerp;
bool ddp_allowed;
ssize_t hdrlen;
__be32 *iptr;
__be32 *p;
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
if (test_bit(RPC_BC_PA_IN_USE, &rqst->rq_bc_pa_state))
@ -685,11 +688,18 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
#endif
headerp = rdmab_to_msg(req->rl_rdmabuf);
/* don't byte-swap XID, it's already done in request */
headerp->rm_xid = rqst->rq_xid;
headerp->rm_vers = rpcrdma_version;
headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_max_requests);
headerp->rm_type = rdma_msg;
rpcrdma_set_xdrlen(&req->rl_hdrbuf, 0);
xdr_init_encode(xdr, &req->rl_hdrbuf,
req->rl_rdmabuf->rg_base);
/* Fixed header fields */
iptr = ERR_PTR(-EMSGSIZE);
p = xdr_reserve_space(xdr, 4 * sizeof(*p));
if (!p)
goto out_err;
*p++ = rqst->rq_xid;
*p++ = rpcrdma_version;
*p++ = cpu_to_be32(r_xprt->rx_buf.rb_max_requests);
/* When the ULP employs a GSS flavor that guarantees integrity
* or privacy, direct data placement of individual data items
@ -729,12 +739,14 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
* by themselves are larger than the inline threshold.
*/
if (rpcrdma_args_inline(r_xprt, rqst)) {
*p++ = rdma_msg;
rtype = rpcrdma_noch;
} else if (ddp_allowed && rqst->rq_snd_buf.flags & XDRBUF_WRITE) {
*p++ = rdma_msg;
rtype = rpcrdma_readch;
} else {
r_xprt->rx_stats.nomsg_call_count++;
headerp->rm_type = htonl(RDMA_NOMSG);
*p++ = rdma_nomsg;
rtype = rpcrdma_areadch;
}

1
net/sunrpc/xprtrdma/transport.c
View File

@ -559,6 +559,7 @@ rpcrdma_get_rdmabuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
r_xprt->rx_stats.hardway_register_count += size;
req->rl_rdmabuf = rb;
xdr_buf_init(&req->rl_hdrbuf, rb->rg_base, rdmab_length(rb));
return true;
}

2
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -345,6 +345,8 @@ struct rpcrdma_req {
unsigned int rl_connect_cookie;
struct rpcrdma_buffer *rl_buffer;
struct rpcrdma_rep *rl_reply;
struct xdr_stream rl_stream;
struct xdr_buf rl_hdrbuf;
struct ib_send_wr rl_send_wr;
struct ib_sge rl_send_sge[RPCRDMA_MAX_SEND_SGES];
struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */