From: Chien Tung <ctung@neteffect.com>
Date: Fri, 21 Mar 2008 00:55:30 +0000 (-0500)
Subject: RDMA/nes: Fix MSS calculation on RDMA path
X-Git-Tag: v2.6.25-rc7~29^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2b2b59b93082d02ee5ec8fda4ed94f498551a47;p=linux-2.6

RDMA/nes: Fix MSS calculation on RDMA path

Fix the calculation of the MSS for RDMA connections: we need to
allow space in frames for a VLAN tag too.

Signed-off-by: Chien Tung <ctung@neteffect.com>
Signed-off-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
---

diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index 39adb267fb..0bef878e0f 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -40,6 +40,7 @@
 #include <linux/tcp.h>
 #include <linux/init.h>
 #include <linux/if_arp.h>
+#include <linux/if_vlan.h>
 #include <linux/notifier.h>
 #include <linux/net.h>
 #include <linux/types.h>
@@ -1072,7 +1073,7 @@ static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
 	ts = current_kernel_time();
 	cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
 	cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
-			sizeof(struct tcphdr) - ETH_HLEN;
+			sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
 	cm_node->tcp_cntxt.rcv_nxt = 0;
 	/* get a unique session ID , add thread_id to an upcounter to handle race */
 	atomic_inc(&cm_core->node_cnt);