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svcrdma: Normalize Send page handling 

Currently svc_rdma_sendto() migrates xdr_buf pages into a separate
page list and NULLs out a bunch of entries in rq_pages while the
pages are under I/O. The Send completion handler then frees those
pages later.

Instead, let's wait for the Send completion, then handle page
releasing in the nfsd thread. I'd like to avoid the cost of 250+
put_page() calls in the Send completion handler, which is single-
threaded.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2021-01-13 13:57:18 -05:00
parent e844d307d4
commit 2a1e4f21d8
3 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/sunrpc/svc_rdma.h
View File

@ -160,6 +160,7 @@ struct svc_rdma_send_ctxt {
struct ib_send_wr sc_send_wr;
struct ib_cqe sc_cqe;
struct completion sc_done;
struct xdr_buf sc_hdrbuf;
struct xdr_stream sc_stream;
void *sc_xprt_buf;

8
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View File

@ -93,7 +93,13 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
*/
get_page(virt_to_page(rqst->rq_buffer));
sctxt->sc_send_wr.opcode = IB_WR_SEND;
return svc_rdma_send(rdma, sctxt);
ret = svc_rdma_send(rdma, sctxt);
if (ret < 0)
return ret;
ret = wait_for_completion_killable(&sctxt->sc_done);
svc_rdma_send_ctxt_put(rdma, sctxt);
return ret;
}
/* Server-side transport endpoint wants a whole page for its send

29
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View File

@ -155,6 +155,7 @@ svc_rdma_send_ctxt_alloc(struct svcxprt_rdma *rdma)
ctxt->sc_send_wr.wr_cqe = &ctxt->sc_cqe;
ctxt->sc_send_wr.sg_list = ctxt->sc_sges;
ctxt->sc_send_wr.send_flags = IB_SEND_SIGNALED;
init_completion(&ctxt->sc_done);
ctxt->sc_cqe.done = svc_rdma_wc_send;
ctxt->sc_xprt_buf = buffer;
xdr_buf_init(&ctxt->sc_hdrbuf, ctxt->sc_xprt_buf,
@ -280,11 +281,11 @@ static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
trace_svcrdma_wc_send(wc, &ctxt->sc_cid);
complete(&ctxt->sc_done);
atomic_inc(&rdma->sc_sq_avail);
wake_up(&rdma->sc_send_wait);
svc_rdma_send_ctxt_put(rdma, ctxt);
if (unlikely(wc->status != IB_WC_SUCCESS))
svc_xprt_deferred_close(&rdma->sc_xprt);
}
@ -294,7 +295,7 @@ static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
* @rdma: transport on which to post the WR
* @ctxt: send ctxt with a Send WR ready to post
*
* Returns zero the Send WR was posted successfully. Otherwise, a
* Returns zero if the Send WR was posted successfully. Otherwise, a
* negative errno is returned.
*/
int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt)
@ -302,7 +303,7 @@ int svc_rdma_send(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt)
struct ib_send_wr *wr = &ctxt->sc_send_wr;
int ret;
might_sleep();
reinit_completion(&ctxt->sc_done);
/* Sync the transport header buffer */
ib_dma_sync_single_for_device(rdma->sc_pd->device,
@ -795,7 +796,7 @@ int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
* svc_rdma_sendto returns. Transfer pages under I/O to the ctxt
* so they are released by the Send completion handler.
*/
static void svc_rdma_save_io_pages(struct svc_rqst *rqstp,
static inline void svc_rdma_save_io_pages(struct svc_rqst *rqstp,
struct svc_rdma_send_ctxt *ctxt)
{
int i, pages = rqstp->rq_next_page - rqstp->rq_respages;
@ -839,15 +840,20 @@ static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma,
if (ret < 0)
return ret;
svc_rdma_save_io_pages(rqstp, sctxt);
if (rctxt->rc_inv_rkey) {
sctxt->sc_send_wr.opcode = IB_WR_SEND_WITH_INV;
sctxt->sc_send_wr.ex.invalidate_rkey = rctxt->rc_inv_rkey;
} else {
sctxt->sc_send_wr.opcode = IB_WR_SEND;
}
return svc_rdma_send(rdma, sctxt);
ret = svc_rdma_send(rdma, sctxt);
if (ret < 0)
return ret;
ret = wait_for_completion_killable(&sctxt->sc_done);
svc_rdma_send_ctxt_put(rdma, sctxt);
return ret;
}
/**
@ -913,7 +919,8 @@ void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
sctxt->sc_sges[0].length = sctxt->sc_hdrbuf.len;
if (svc_rdma_send(rdma, sctxt))
goto put_ctxt;
return;
wait_for_completion_killable(&sctxt->sc_done);
put_ctxt:
svc_rdma_send_ctxt_put(rdma, sctxt);
@ -981,10 +988,6 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
if (ret != -E2BIG && ret != -EINVAL)
goto err1;
/* Send completion releases payload pages that were part
* of previously posted RDMA Writes.
*/
svc_rdma_save_io_pages(rqstp, sctxt);
svc_rdma_send_error_msg(rdma, sctxt, rctxt, ret);
return 0;