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Subject[PATCH 4.19 43/44] svcrdma: Reduce max_send_sges
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuck Lever <chuck.lever@oracle.com>

commit f3c1fd0ee294abd4367dfa72d89f016c682202f0 upstream.

There's no need to request a large number of send SGEs because the
inline threshold already constrains the number of SGEs per Send.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Cc: Don Dutile <ddutile@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/sunrpc/xprtrdma/svc_rdma_transport.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -475,10 +475,12 @@ static struct svc_xprt *svc_rdma_accept(

/* Qualify the transport resource defaults with the
* capabilities of this particular device */
- newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
- /* transport hdr, head iovec, one page list entry, tail iovec */
- if (newxprt->sc_max_send_sges < 4) {
- pr_err("svcrdma: too few Send SGEs available (%d)\n",
+ /* Transport header, head iovec, tail iovec */
+ newxprt->sc_max_send_sges = 3;
+ /* Add one SGE per page list entry */
+ newxprt->sc_max_send_sges += svcrdma_max_req_size / PAGE_SIZE;
+ if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) {
+ pr_err("svcrdma: too few Send SGEs available (%d needed)\n",
newxprt->sc_max_send_sges);
goto errout;
}

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