[v1,02/18] xprtrdma: Fix calculation of ri_max_segs again
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Message ID 20190806155357.9529.18087.stgit@manet.1015granger.net
State New
Headers show
Series
  • NFS/RDMA patches
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Commit Message

Chuck Lever Aug. 6, 2019, 3:53 p.m. UTC
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(-)

Patch
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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)