>Number: 161277
>Category: kern
>Synopsis: [patch][if_em] BMC cannot receive IPMI traffic after loading
>or enabling the if_em driver
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 04 11:30:16 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Rafael NAVAZA
>Release: FreeBSD 8.2
>Organization:
Institut Pasteur
>Environment:
FreeBSD frbox 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Fri Feb 18 02:24:46 UTC 2011
r...@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
>Description:
With Intel 82473E NICs, the BMC cannot receive IPMI-over-LAN traffic after
loading or enabling the if_em driver.
>How-To-Repeat:
Get a machine with BMC enabled Intel 82573E NIC, and try to "ifconfig" the "em"
interfaces.
Then the BMC will stop responding to the IPMI-over-LAN traffic.
>Fix:
Disable the CRC stripping in the if_em driver.
Proposed fix : Add an "em.disable_crc_stripping" option to the if_em driver.
Patch attached with submission follows:
--- /usr/src/sys/dev/e1000/if_em.c 2011-01-26 00:20:22.000000000 +0100
+++ /usr/src/sys/dev/e1000/if_em.c.disable_crc_stripping 2011-09-15
12:44:23.000000000 +0200
@@ -332,6 +332,12 @@
#define CSUM_TSO 0
#endif
+static int em_disable_crc_stripping = 0;
+TUNABLE_INT("hw.em.disable_crc_stripping", &em_disable_crc_stripping);
+
+SYSCTL_NODE(_hw, OID_AUTO, em, CTLFLAG_RD, 0, "EM driver parameters");
+SYSCTL_INT(_hw_em, OID_AUTO, disable_crc_stripping, CTLFLAG_RD,
&em_disable_crc_stripping, 0, "Disable CRC Stripping");
+
static int em_tx_int_delay_dflt = EM_TICKS_TO_USECS(EM_TIDV);
static int em_rx_int_delay_dflt = EM_TICKS_TO_USECS(EM_RDTR);
TUNABLE_INT("hw.em.tx_int_delay", &em_tx_int_delay_dflt);
@@ -4150,7 +4156,8 @@
(hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT);
/* Strip the CRC */
- rctl |= E1000_RCTL_SECRC;
+ if (!em_disable_crc_stripping)
+ rctl |= E1000_RCTL_SECRC;
/* Make sure VLAN Filters are off */
rctl &= ~E1000_RCTL_VFE;
>Release-Note:
>Audit-Trail:
>Unformatted:
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