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svcrdma: Retain the page backing rq_res.head[0].iov_base 

svc_rdma_sendto() now waits for the NIC hardware to finish with
the pages backing rq_res. We still have to release the page array
in some cases, but now it's always safe to immediately re-use the
page backing rq_res's head buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2021-02-01 15:16:57 -05:00
parent 579900670a
commit cc93ce9529
1 changed files with 5 additions and 0 deletions
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5
net/sunrpc/xprtrdma/svc_rdma_sendto.c
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@ -957,6 +957,11 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
ret = svc_rdma_send_reply_msg(rdma, sctxt, rctxt, rqstp);
if (ret < 0)
goto err1;
/* Prevent svc_xprt_release() from releasing the page backing
* rq_res.head[0].iov_base. It's no longer being accessed by
* the I/O device. */
rqstp->rq_respages++;
return 0;
err2: