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Subject: [PATCH v1 4/7] svcrdma: trace cc_release calls
From:   Chuck Lever <cel@kernel.org>
To:     linux-nfs@vger.kernel.org
Cc:     Chuck Lever <chuck.lever@oracle.com>
Date:   Mon, 12 Jun 2023 10:13:51 -0400
Message-ID: <168657923186.5674.5040517820045674722.stgit@manet.1015granger.net>
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From: Chuck Lever <chuck.lever@oracle.com>

This event brackets the svcrdma_post_* trace points. If this trace
event is enabled but does not appear as expected, that indicates a
chunk_ctxt leak.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/trace/events/rpcrdma.h    |    8 ++++++++
 net/sunrpc/xprtrdma/svc_rdma_rw.c |    2 ++
 2 files changed, 10 insertions(+)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index 8f461e04e5f0..f8069ef2ee0f 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -2112,6 +2112,14 @@ DEFINE_POST_CHUNK_EVENT(read);
 DEFINE_POST_CHUNK_EVENT(write);
 DEFINE_POST_CHUNK_EVENT(reply);
 
+DEFINE_EVENT(svcrdma_post_chunk_class, svcrdma_cc_release,
+	TP_PROTO(
+		const struct rpc_rdma_cid *cid,
+		int sqecount
+	),
+	TP_ARGS(cid, sqecount)
+);
+
 TRACE_EVENT(svcrdma_wc_read,
 	TP_PROTO(
 		const struct ib_wc *wc,
diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 59ea87b5f458..9836406cc41e 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -191,6 +191,8 @@ static void svc_rdma_cc_release(struct svc_rdma_chunk_ctxt *cc,
 	struct svc_rdma_rw_ctxt *ctxt;
 	LLIST_HEAD(free);
 
+	trace_svcrdma_cc_release(&cc->cc_cid, cc->cc_sqecount);
+
 	first = last = NULL;
 	while ((ctxt = svc_rdma_next_ctxt(&cc->cc_rwctxts)) != NULL) {
 		list_del(&ctxt->rw_list);