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svcrdma: Post RDMA Writes while XDR encoding replies

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The only RPC/RDMA ordering requirement between RDMA Writes and RDMA
Sends is that the responder must post the Writes on the Send queue
before posting the Send that conveys the RPC Reply for that Write
payload.

The Linux NFS server implementation now has a transport method that
can post result Payload Writes earlier than svc_rdma_sendto:

   ->xpo_result_payload()

This gets RDMA Writes going earlier so they are more likely to be
complete at the remote end before the Send completes.

Some care must be taken with pulled-up Replies. We don't want to
push the Write chunk and then send the same payload data via Send.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2020-03-13 10:42:10 -04:00
parent 76e5492b16
commit f6ad77590a
3 changed files with 77 additions and 39 deletions
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4
include/linux/sunrpc/svc_rdma.h
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@ -183,9 +183,7 @@ extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
struct svc_rqst *rqstp,
struct svc_rdma_recv_ctxt *head, __be32 *p);
extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
__be32 *wr_ch, struct xdr_buf *xdr,
unsigned int offset,
unsigned long length);
__be32 *wr_ch, const struct xdr_buf *xdr);
extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
const struct svc_rdma_recv_ctxt *rctxt,
struct xdr_buf *xdr);