From: Ralph Campbell <ralphc@pathscale.com>
Date: Fri, 3 Feb 2006 22:28:48 +0000 (-0800)
Subject: IB/mad: Handle DR SMPs with a LID routed part
X-Git-Tag: v2.6.16-rc4~83^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cf3f04f45694db0699f608c0e3fb550c607cc88;p=linux-2.6

IB/mad: Handle DR SMPs with a LID routed part

Fix handling of directed route SMPs with a beginning or ending LID
routed part.

Signed-off-by: Ralph Campbell <ralphc@pathscale.com>
Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
---

diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index d393b504bf..c82f47a66e 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -665,7 +665,15 @@ static int handle_outgoing_dr_smp(struct ib_mad_agent_private *mad_agent_priv,
 	struct ib_wc mad_wc;
 	struct ib_send_wr *send_wr = &mad_send_wr->send_wr;
 
-	if (!smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
+	/*
+	 * Directed route handling starts if the initial LID routed part of
+	 * a request or the ending LID routed part of a response is empty.
+	 * If we are at the start of the LID routed part, don't update the
+	 * hop_ptr or hop_cnt.  See section 14.2.2, Vol 1 IB spec.
+	 */
+	if ((ib_get_smp_direction(smp) ? smp->dr_dlid : smp->dr_slid) ==
+	     IB_LID_PERMISSIVE &&
+	    !smi_handle_dr_smp_send(smp, device->node_type, port_num)) {
 		ret = -EINVAL;
 		printk(KERN_ERR PFX "Invalid directed route\n");
 		goto out;