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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 02/18] xprtrdma: Fix calculation of ri_max_segs again
Date: Tue, 06 Aug 2019 11:53:57 -0400
Message-ID: <20190806155357.9529.18087.stgit@manet.1015granger.net> (raw)
In-Reply-To: <20190806155246.9529.14571.stgit@manet.1015granger.net>

Commit 302d3deb206 ("xprtrdma: Prevent inline overflow") added this
calculation back in 2016, but got it wrong. I tested only the lower
bound, which is why there is a max_t there. The upper bound should be
rounded up too.

Now, when using DIV_ROUND_UP, that takes care of the lower bound as
well.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/frwr_ops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index a30f2ae..3a10bff 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -260,8 +260,8 @@ int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep)
 	ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
 	ep->rep_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */
 
-	ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
-				ia->ri_max_frwr_depth);
+	ia->ri_max_segs =
+		DIV_ROUND_UP(RPCRDMA_MAX_DATA_SEGS, ia->ri_max_frwr_depth);
 	/* Reply chunks require segments for head and tail buffers */
 	ia->ri_max_segs += 2;
 	if (ia->ri_max_segs > RPCRDMA_MAX_HDR_SEGS)


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-06 15:53 [PATCH v1 00/18] NFS/RDMA patches Chuck Lever
2019-08-06 15:53 ` [PATCH v1 01/18] xprtrdma: Refresh the documenting comment in frwr_ops.c Chuck Lever
2019-08-06 15:53 ` Chuck Lever [this message]
2019-08-06 15:54 ` [PATCH v1 03/18] xprtrdma: Boost maximum transport header size Chuck Lever
2019-08-06 15:54 ` [PATCH v1 04/18] xprtrdma: Boost client's max slot table size to match Linux server Chuck Lever
2019-08-06 15:54 ` [PATCH v1 05/18] xprtrdma: Rename CQE field in Receive trace points Chuck Lever
2019-08-06 15:54 ` [PATCH v1 06/18] xprtrdma: Rename rpcrdma_buffer::rb_all Chuck Lever
2019-08-06 15:54 ` [PATCH v1 07/18] xprtrdma: Toggle XPRT_CONGESTED in xprtrdma's slot methods Chuck Lever
2019-08-06 15:54 ` [PATCH v1 08/18] xprtrdma: Simplify rpcrdma_mr_pop Chuck Lever
2019-08-06 15:54 ` [PATCH v1 09/18] xprtrdma: Combine rpcrdma_mr_put and rpcrdma_mr_unmap_and_put Chuck Lever
2019-08-06 15:54 ` [PATCH v1 10/18] xprtrdma: Move rpcrdma_mr_get out of frwr_map Chuck Lever
2019-08-06 15:54 ` [PATCH v1 11/18] xprtrdma: Ensure creating an MR does not trigger FS writeback Chuck Lever
2019-08-06 15:54 ` [PATCH v1 12/18] xprtrdma: Cache free MRs in each rpcrdma_req Chuck Lever
2019-08-06 15:54 ` [PATCH v1 13/18] xprtrdma: Remove rpcrdma_buffer::rb_mrlock Chuck Lever
2019-08-06 15:55 ` [PATCH v1 14/18] xprtrdma: Use an llist to manage free rpcrdma_reps Chuck Lever
2019-08-06 15:55 ` [PATCH v1 15/18] xprtrdma: Clean up xprt_rdma_set_connect_timeout() Chuck Lever
2019-08-06 15:55 ` [PATCH v1 16/18] xprtdma: Fix bc_max_slots return value Chuck Lever
2019-08-06 15:55 ` [PATCH v1 17/18] xprtrdma: Inline XDR chunk encoder functions Chuck Lever
2019-08-06 15:55 ` [PATCH v1 18/18] xprtrdma: Optimize rpcrdma_post_recvs() Chuck Lever

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