e1000e: fix packet corruption and tx hang during NFSv2
when receiving a particular type of NFS v2 UDP traffic, the hardware could
DMA some bad data and then hang, possibly corrupting memory.
Disable the NFS parsing in this hardware, verified to fix the bug.
Originally reported and reproduced by RedHat's Neil Horman
CC: nhorman@tuxdriver.com
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 54d03a0..8b5e157 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -2740,6 +2740,16 @@
reg &= ~(1 << 31);
ew32(STATUS, reg);
}
+
+ /*
+ * work-around descriptor data corruption issue during nfs v2 udp
+ * traffic, just disable the nfs filtering capability
+ */
+ reg = er32(RFCTL);
+ reg |= (E1000_RFCTL_NFSW_DIS | E1000_RFCTL_NFSR_DIS);
+ ew32(RFCTL, reg);
+
+ return;
}
/**