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svcrdma: Refactor chunk list encoders

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Same idea as the receive-side changes I did a while back: use
xdr_stream helpers rather than open-coding the XDR chunk list
encoders. This builds the Reply transport header from beginning to
end without backtracking.

As additional clean-ups, fill in documenting comments for the XDR
encoders and sprinkle some trace points in the new encoding
functions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2020-03-02 15:02:20 -05:00
parent 5c266df527
commit 6fd5034db4
4 changed files with 210 additions and 122 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@@ -698,7 +698,6 @@ static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
__be32 *rdma_argp, int status)
{
struct svc_rdma_send_ctxt *ctxt;
unsigned int length;
__be32 *p;
int ret;
@@ -706,29 +705,46 @@ static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
if (!ctxt)
return;
p = ctxt->sc_xprt_buf;
p = xdr_reserve_space(&ctxt->sc_stream,
rpcrdma_fixed_maxsz * sizeof(*p));
if (!p)
goto put_ctxt;
*p++ = *rdma_argp;
*p++ = *(rdma_argp + 1);
*p++ = xprt->sc_fc_credits;
*p++ = rdma_error;
*p = rdma_error;
switch (status) {
case -EPROTONOSUPPORT:
p = xdr_reserve_space(&ctxt->sc_stream, 3 * sizeof(*p));
if (!p)
goto put_ctxt;
*p++ = err_vers;
*p++ = rpcrdma_version;
*p++ = rpcrdma_version;
*p = rpcrdma_version;
trace_svcrdma_err_vers(*rdma_argp);
break;
default:
*p++ = err_chunk;
p = xdr_reserve_space(&ctxt->sc_stream, sizeof(*p));
if (!p)
goto put_ctxt;
*p = err_chunk;
trace_svcrdma_err_chunk(*rdma_argp);
}
length = (unsigned long)p - (unsigned long)ctxt->sc_xprt_buf;
svc_rdma_sync_reply_hdr(xprt, ctxt, length);
svc_rdma_sync_reply_hdr(xprt, ctxt, ctxt->sc_hdrbuf.len);
ctxt->sc_send_wr.opcode = IB_WR_SEND;
ret = svc_rdma_send(xprt, &ctxt->sc_send_wr);
if (ret)
svc_rdma_send_ctxt_put(xprt, ctxt);
goto put_ctxt;
return;
put_ctxt:
svc_rdma_send_ctxt_put(xprt, ctxt);
}
/* By convention, backchannel calls arrive via rdma_msg type