diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2026-02-27 09:03:31 -0500 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2026-03-29 21:25:09 -0400 |
| commit | d16f060f3ee297424c0aba047b1d49208adb9318 (patch) | |
| tree | 70d24c6a893ef61858620798525817322151bff0 /include/linux | |
| parent | c553983efad2ef0f1a8728a7a9104136297d8a0d (diff) | |
svcrdma: Add Write chunk WRs to the RPC's Send WR chain
Previously, Write chunk RDMA Writes were posted via a separate
ib_post_send() call with their own completion handler. Each Write
chunk incurred a doorbell and generated a completion event.
Link Write chunk WRs onto the RPC Reply's Send WR chain so that a
single ib_post_send() call posts both the RDMA Writes and the Send
WR. A single completion event signals that all operations have
finished. This reduces both doorbell rate and completion rate, as
well as eliminating the latency of a round-trip between the Write
chunk completion and the subsequent Send WR posting.
The lifecycle of Write chunk resources changes: previously, the
svc_rdma_write_done() completion handler released Write chunk
resources when RDMA Writes completed. With WR chaining, resources
remain live until the Send completion. A new sc_write_info_list
tracks Write chunk metadata attached to each Send context, and
svc_rdma_write_chunk_release() frees these resources when the
Send context is released.
The svc_rdma_write_done() handler now handles only error cases.
On success it returns immediately since the Send completion handles
resource release. On failure (WR flush), it closes the connection
to signal to the client that the RPC Reply is incomplete.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sunrpc/svc_rdma.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 658b8498177e..df6e08aaad57 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -216,6 +216,7 @@ struct svc_rdma_recv_ctxt { */ struct svc_rdma_write_info { struct svcxprt_rdma *wi_rdma; + struct list_head wi_list; const struct svc_rdma_chunk *wi_chunk; @@ -244,7 +245,10 @@ struct svc_rdma_send_ctxt { struct ib_cqe sc_cqe; struct xdr_buf sc_hdrbuf; struct xdr_stream sc_stream; + + struct list_head sc_write_info_list; struct svc_rdma_write_info sc_reply_info; + void *sc_xprt_buf; int sc_page_count; int sc_cur_sge_no; @@ -277,11 +281,14 @@ extern void svc_rdma_cc_init(struct svcxprt_rdma *rdma, extern void svc_rdma_cc_release(struct svcxprt_rdma *rdma, struct svc_rdma_chunk_ctxt *cc, enum dma_data_direction dir); +extern void svc_rdma_write_chunk_release(struct svcxprt_rdma *rdma, + struct svc_rdma_send_ctxt *ctxt); extern void svc_rdma_reply_chunk_release(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt); -extern int svc_rdma_send_write_list(struct svcxprt_rdma *rdma, - const struct svc_rdma_recv_ctxt *rctxt, - const struct xdr_buf *xdr); +extern int svc_rdma_prepare_write_list(struct svcxprt_rdma *rdma, + const struct svc_rdma_recv_ctxt *rctxt, + struct svc_rdma_send_ctxt *sctxt, + const struct xdr_buf *xdr); extern int svc_rdma_prepare_reply_chunk(struct svcxprt_rdma *rdma, const struct svc_rdma_pcl *write_pcl, const struct svc_rdma_pcl *reply_pcl, |