@@ -141,7 +141,8 @@ struct svcxprt_rdma {
atomic_t sc_sq_avail; /* SQEs ready to be consumed */
unsigned int sc_sq_depth; /* Depth of SQ */
unsigned int sc_rq_depth; /* Depth of RQ */
- u32 sc_max_requests; /* Forward credits */
+ __be32 sc_fc_credits; /* Forward credits */
+ u32 sc_max_requests; /* Max requests */
u32 sc_max_bc_requests;/* Backward credits */
int sc_max_req_size; /* Size of each RQ WR buf */
@@ -214,10 +215,6 @@ extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
__be32, __be64, u32);
-extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
- struct rpcrdma_msg *,
- struct rpcrdma_msg *,
- enum rpcrdma_proc);
extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
/* svc_rdma_recvfrom.c */
@@ -249,7 +249,7 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
*va++ = rmsgp->rm_xid;
*va++ = rmsgp->rm_vers;
- *va++ = cpu_to_be32(xprt->sc_max_requests);
+ *va++ = xprt->sc_fc_credits;
*va++ = rdma_error;
*va++ = cpu_to_be32(err);
if (err == ERR_VERS) {
@@ -329,19 +329,3 @@ void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
seg->rs_offset = rs_offset;
seg->rs_length = cpu_to_be32(write_len);
}
-
-void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
- struct rpcrdma_msg *rdma_argp,
- struct rpcrdma_msg *rdma_resp,
- enum rpcrdma_proc rdma_type)
-{
- rdma_resp->rm_xid = rdma_argp->rm_xid;
- rdma_resp->rm_vers = rdma_argp->rm_vers;
- rdma_resp->rm_credit = cpu_to_be32(xprt->sc_max_requests);
- rdma_resp->rm_type = cpu_to_be32(rdma_type);
-
- /* Encode <nul> chunks lists */
- rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
- rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
- rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
-}
@@ -560,12 +560,12 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
struct rpcrdma_msg *rdma_argp;
struct rpcrdma_msg *rdma_resp;
struct rpcrdma_write_array *wr_ary, *rp_ary;
- enum rpcrdma_proc reply_type;
int ret;
int inline_bytes;
struct page *res_page;
struct svc_rdma_req_map *vec;
u32 inv_rkey;
+ __be32 *p;
dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
@@ -597,12 +597,17 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
if (!res_page)
goto err0;
rdma_resp = page_address(res_page);
- if (rp_ary)
- reply_type = RDMA_NOMSG;
- else
- reply_type = RDMA_MSG;
- svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
- rdma_resp, reply_type);
+
+ p = &rdma_resp->rm_xid;
+ *p++ = rdma_argp->rm_xid;
+ *p++ = rdma_argp->rm_vers;
+ *p++ = rdma->sc_fc_credits;
+ *p++ = rp_ary ? rdma_nomsg : rdma_msg;
+
+ /* Start with empty chunks */
+ *p++ = xdr_zero;
+ *p++ = xdr_zero;
+ *p = xdr_zero;
/* Send any write-chunk data and build resp write-list */
if (wr_ary) {
@@ -1002,6 +1002,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
newxprt->sc_max_req_size = svcrdma_max_req_size;
newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
svcrdma_max_requests);
+ newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
svcrdma_max_bc_requests);
newxprt->sc_rq_depth = newxprt->sc_max_requests +
Replace C structure-based XDR decoding with pointer arithmetic. Pointer arithmetic is considered more portable, and is used throughout the kernel's existing XDR encoders. The gcc optimizer generates similar assembler code either way. Byte-swapping before a memory store on x86 typically results in an instruction pipeline stall. Avoid byte-swapping when encoding a new header. svcrdma currently doesn't alter a connection's credit grant value after the connection has been accepted, so it is effectively a constant. Cache the byte-swapped value in a separate field. Christoph suggested pulling the header encoding logic into the only function that uses it. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> --- include/linux/sunrpc/svc_rdma.h | 7 ++----- net/sunrpc/xprtrdma/svc_rdma_marshal.c | 18 +----------------- net/sunrpc/xprtrdma/svc_rdma_sendto.c | 19 ++++++++++++------- net/sunrpc/xprtrdma/svc_rdma_transport.c | 1 + 4 files changed, 16 insertions(+), 29 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html