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SUNRPC: Move svc_xprt_received() call sites

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Currently, XPT_BUSY is not cleared until xpo_recvfrom returns.
That effectively blocks the receipt and handling of the next RPC
message until the current one has been taken off the transport.
This strict ordering is a requirement for socket transports.

For our kernel RPC/RDMA transport implementation, however, dequeuing
an ingress message is nothing more than a list_del(). The transport
can safely be marked un-busy as soon as that is done.

To keep the changes simpler, this patch just moves the
svc_xprt_received() call site from svc_handle_xprt() into the
transports, so that the actual optimization can be done in a
subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2021-01-05 10:15:09 -05:00
parent 7dcfbd86ad
commit 82011c80b3
3 changed files with 17 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@@ -846,6 +846,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
/* No new incoming requests, terminate the loop */
clear_bit(XPT_DATA, &xprt->xpt_flags);
spin_unlock(&rdma_xprt->sc_rq_dto_lock);
svc_xprt_received(xprt);
return 0;
}
list_del(&ctxt->rc_list);
@@ -883,28 +884,33 @@ complete:
rqstp->rq_xprt_ctxt = ctxt;
rqstp->rq_prot = IPPROTO_MAX;
svc_xprt_copy_addrs(rqstp, xprt);
svc_xprt_received(xprt);
return rqstp->rq_arg.len;
out_readlist:
ret = svc_rdma_process_read_list(rdma_xprt, rqstp, ctxt);
if (ret < 0)
goto out_readfail;
svc_xprt_received(xprt);
return 0;
out_err:
svc_rdma_send_error(rdma_xprt, ctxt, ret);
svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
svc_xprt_received(xprt);
return 0;
out_readfail:
if (ret == -EINVAL)
svc_rdma_send_error(rdma_xprt, ctxt, ret);
svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
svc_xprt_received(xprt);
return ret;
out_backchannel:
svc_rdma_handle_bc_reply(rqstp, ctxt);
out_drop:
svc_rdma_recv_ctxt_put(rdma_xprt, ctxt);
svc_xprt_received(xprt);
return 0;
}