RE: SOVLED: Problems with CARP, VLANs and em driver

• Previous message: Michael Vince: "Re: cisco vpn experience?"
• In reply to: Eivind Hestnes: "Problems with CARP, VLANs and em driver"
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To: <eivind@stabbursmoen.no>, <net@freebsd.org>
Date: Mon, 18 Apr 2005 22:47:06 +0200

The vlan(4) device is not yet officially supported for carp(4). It works for
NICs which talks to mii, but cards such as em(4) could get problems.

Thanks to Max Laier, Gleb Smirnoff and Yar Tikhiy which supplied me the
following patch. It solved my problem with CARP, VLANs and the em(4)
driver.. thanks guys!

Index: if_em.c
===================================================================
RCS file: /home/ncvs/freebsd/src/sys/dev/em/if_em.c,v
retrieving revision 1.1.1.2
retrieving revision 1.3
diff -u -r1.1.1.2 -r1.3
--- if_em.c 20 Mar 2005 13:23:44 -0000 1.1.1.2
+++ if_em.c 21 Mar 2005 12:23:02 -0000 1.3
@@ -1666,9 +1666,15 @@
         return;
 }
 
+#ifdef DEV_CARP /* XXX */
+extern void (*vlan_link_state_p)(struct ifnet *, int); #endif
+
 static void
 em_print_link_status(struct adapter * adapter) {
+ struct ifnet *ifp = &adapter->interface_data.ac_if;
+
         if (E1000_READ_REG(&adapter->hw, STATUS) & E1000_STATUS_LU) {
                 if (adapter->link_active == 0) {
                         em_get_speed_and_duplex(&adapter->hw,
@@ -1681,6 +1687,13 @@
                                 "Full Duplex" : "Half Duplex"));
                         adapter->link_active = 1;
                         adapter->smartspeed = 0;
+ ifp->if_link_state = LINK_STATE_UP;
+#ifdef DEV_CARP
+ if (ifp->if_nvlans != 0)
+ (*vlan_link_state_p)(ifp, NOTE_LINKUP); /*
XXX */
+ if (ifp->if_carp)
+ carp_carpdev_state(ifp->if_carp);
+#endif
                 }
         } else {
                 if (adapter->link_active == 1) {
@@ -1688,6 +1701,13 @@
                         adapter->link_duplex = 0;
                         printf("em%d: Link is Down\n", adapter->unit);
                         adapter->link_active = 0;
+ ifp->if_link_state = LINK_STATE_DOWN; #ifdef
DEV_CARP
+ if (ifp->if_nvlans != 0)
+ (*vlan_link_state_p)(ifp, NOTE_LINKDOWN); /*
XXX */
+ if (ifp->if_carp)
+ carp_carpdev_state(ifp->if_carp);
+#endif
                 }
         }
 

Index: if_vlan.c
===================================================================
RCS file: /home/ncvs/freebsd/src/sys/net/if_vlan.c,v
retrieving revision 1.1.1.2
retrieving revision 1.2
diff -u -r1.1.1.2 -r1.2
--- if_vlan.c 20 Mar 2005 13:25:00 -0000 1.1.1.2
+++ if_vlan.c 21 Mar 2005 12:23:06 -0000 1.2
@@ -41,6 +41,7 @@
  * and ask it to send them.
  */
 
+#include "opt_carp.h"
 #include "opt_inet.h"
 
 #include <sys/param.h>
@@ -67,6 +68,11 @@
 #ifdef INET
 #include <netinet/in.h>
 #include <netinet/if_ether.h>
+
+#ifdef DEV_CARP
+#include <netinet/in_var.h>
+#include <netinet/ip_carp.h>
+#endif
 #endif
 
 #define VLANNAME "vlan"
@@ -822,6 +828,10 @@
                         ifv->ifv_if.if_link_state =
ifv->ifv_p->if_link_state;
                         rt_ifmsg(&(ifv->ifv_if));
                         KNOTE_UNLOCKED(&ifp->if_klist, link);
+#ifdef DEV_CARP
+ if (ifv->ifv_if.if_carp)
+ carp_carpdev_state(ifv->ifv_if.if_carp);
+#endif
                 }
         }
         VLAN_UNLOCK();

-----Original Message-----
From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd-net@freebsd.org]
On Behalf Of Eivind Hestnes
Sent: Sunday, April 17, 2005 4:02 PM
To: net@freebsd.org
Subject: Problems with CARP, VLANs and em driver

Hi,

I recently configured two FreeBSD 5.3 (with XL 3c905C NIC) boxes to act as
one logic router (preemption) between multiple VLANs. The router
has now been in production for four weeks (under heavy load, too), and I
have not run into any problems what-so-ever. Failover is almost
transparent, and the robustness is awesome. All in all, i'm very happy
with CARP.

But to provide more bandwidth to our users, I bought a Intel Pro 1000 MT
(PWLA8490MT) to replace the 3Com 905c card in the master. With some
hacking, I managed to get the Intel card to talk with the VLANs (had to
disable VLAN hardware tagging, as this didn't work with promiscuous mode).

The problem however, is that the CARP interfaces on the master does not
change mode from INIT to MASTER with the Intel card installed. In other
words; the master do not replace the slave.

I have tried the 2.0.5 em driver from Intel (instead of the 1.7.35), but
with no success. Is there some problems with the em driver and CARP,
or must the master and slave have identical NICs?

Regards,
Eivind Hestnes

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• Previous message: Michael Vince: "Re: cisco vpn experience?"
• In reply to: Eivind Hestnes: "Problems with CARP, VLANs and em driver"
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