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From: Chuck Lever <chuck.lever@oracle.com>
To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: [PATCH v1 5/8] xprtrdma: Improve commentary around rpcrdma_reps_unmap()
Date: Wed, 31 Mar 2021 15:36:29 -0400	[thread overview]
Message-ID: <161721938951.515226.17560651611000798100.stgit@manet.1015granger.net> (raw)
In-Reply-To: <161721926778.515226.9805598788670386587.stgit@manet.1015granger.net>

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/verbs.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index fe250d554695..b68fc81a78fb 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1034,6 +1034,10 @@ static void rpcrdma_rep_put(struct rpcrdma_buffer *buf,
 	llist_add(&rep->rr_node, &buf->rb_free_reps);
 }
 
+/* Caller must ensure the QP is quiescent (RQ is drained) before
+ * invoking this function, to guarantee rb_all_reps is not
+ * changing.
+ */
 static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt)
 {
 	struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
@@ -1041,7 +1045,7 @@ static void rpcrdma_reps_unmap(struct rpcrdma_xprt *r_xprt)
 
 	list_for_each_entry(rep, &buf->rb_all_reps, rr_all) {
 		rpcrdma_regbuf_dma_unmap(rep->rr_rdmabuf);
-		rep->rr_temp = true;
+		rep->rr_temp = true;	/* Mark this rep for destruction */
 	}
 }
 



  parent reply	other threads:[~2021-03-31 19:37 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31 19:35 [PATCH v1 0/8] xprtrdma Receive Queue fixes Chuck Lever
2021-03-31 19:36 ` [PATCH v1 1/8] xprtrdma: Avoid Receive Queue wrapping Chuck Lever
2021-03-31 20:05   ` Tom Talpey
2021-03-31 19:36 ` [PATCH v1 2/8] xprtrdma: Do not post Receives after disconnect Chuck Lever
2021-03-31 19:59   ` Tom Talpey
2021-03-31 20:31     ` Chuck Lever
2021-03-31 21:22       ` Tom Talpey
2021-04-01 16:56         ` Chuck Lever
2021-03-31 19:36 ` [PATCH v1 3/8] xprtrdma: Put flushed Receives on free list instead of destroying them Chuck Lever
2021-03-31 20:02   ` Tom Talpey
2021-03-31 19:36 ` [PATCH v1 4/8] xprtrdma: Improve locking around rpcrdma_rep destruction Chuck Lever
2021-03-31 19:36 ` Chuck Lever [this message]
2021-03-31 19:36 ` [PATCH v1 6/8] xprtrdma: Improve locking around rpcrdma_rep creation Chuck Lever
2021-03-31 19:36 ` [PATCH v1 7/8] xprtrdma: Fix cwnd update ordering Chuck Lever
2021-03-31 19:36 ` [PATCH v1 8/8] xprtrdma: Delete rpcrdma_recv_buffer_put() Chuck Lever

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