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igb: Add message when malformed packets detected by hw

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This patch adds a check and prints the error cause register value when
the hardware detects a malformed packet.  This is a very unlikely
scenario but has been seen occasionally, so printing the message to
assist the user.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Carolyn Wyborny 2014-07-09 04:55:45 +00:00 committed by Jeff Kirsher
parent caafb95d69
commit 1516f0a649
2 changed files with 26 additions and 0 deletions
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1
drivers/net/ethernet/intel/igb/e1000_regs.h
View file

@ -355,6 +355,7 @@
#define E1000_UTA 0x0A000 /* Unicast Table Array - RW */
#define E1000_IOVTCL 0x05BBC /* IOV Control Register */
#define E1000_TXSWC 0x05ACC /* Tx Switch Control */
#define E1000_LVMMC 0x03548 /* Last VM Misbehavior cause */
/* These act per VF so an array friendly macro is used */
#define E1000_P2VMAILBOX(_n) (0x00C00 + (4 * (_n)))
#define E1000_VMBMEM(_n) (0x00800 + (64 * (_n)))

25
drivers/net/ethernet/intel/igb/igb_main.c
View file

@ -4166,6 +4166,26 @@ static bool igb_thermal_sensor_event(struct e1000_hw *hw, u32 event)
return ret;
}
/**
* igb_check_lvmmc - check for malformed packets received
* and indicated in LVMMC register
* @adapter: pointer to adapter
**/
static void igb_check_lvmmc(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
u32 lvmmc;
lvmmc = rd32(E1000_LVMMC);
if (lvmmc) {
if (unlikely(net_ratelimit())) {
netdev_warn(adapter->netdev,
"malformed Tx packet detected and dropped, LVMMC:0x%08x\n",
lvmmc);
}
}
}
/**
* igb_watchdog - Timer Call-back
* @data: pointer to adapter cast into an unsigned long
@ -4361,6 +4381,11 @@ static void igb_watchdog_task(struct work_struct *work)
igb_spoof_check(adapter);
igb_ptp_rx_hang(adapter);
/* Check LVMMC register on i350/i354 only */
if ((adapter->hw.mac.type == e1000_i350) ||
(adapter->hw.mac.type == e1000_i354))
igb_check_lvmmc(adapter);
/* Reset the timer */
if (!test_bit(__IGB_DOWN, &adapter->state)) {
if (adapter->flags & IGB_FLAG_NEED_LINK_UPDATE)