Stefan Assmann 119b0e0351 igb: add delay to allow igb loopback test to succeed on 8086:10c9 ... Some 8086:10c9 NICs have a problem completing the ethtool loopback test. The result looks like this: ethtool -t eth1 The test result is FAIL The test extra info: Register test (offline) 0 Eeprom test (offline) 0 Interrupt test (offline) 0 Loopback test (offline) 13 Link test (on/offline) 0 A bisect clearly points to commit a95a07445e. However that seems to only trigger the bug. While adding some printk the problem disappeared, so this might be a timing issue. After some trial and error I discovered that adding a small delay just before igb_write_phy_reg() in igb_integrated_phy_loopback() allows the loopback test to succeed. I was unable to figure out the root cause so far but I expect it to be somewhere in the following executing path igb_integrated_phy_loopback ->igb_write_phy_reg_igp ->igb_write_phy_reg_mdic ->igb_acquire_phy_82575 ->igb_acquire_swfw_sync_82575 The problem could only be observed on 8086:10c9 NICs so far and not all of them show the behaviour. I did not restrict the workaround to this type of NIC as it should do no harm to other igb NICs. With the patch below the loopback test succeeded 500 times in a row using a NIC that would otherwise fail. Signed-off-by: Stefan Assmann <sassmann@kpanic.de> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>		2012-08-07 00:47:51 -07:00
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e1000	e1000: advertise transmit time stamping	2012-07-22 12:33:32 -07:00
e1000e	e1000e: 82571 Tx Data Corruption during Tx hang recovery	2012-08-07 00:41:36 -07:00
igb	igb: add delay to allow igb loopback test to succeed on 8086:10c9	2012-08-07 00:47:51 -07:00
igbvf	drivers/net/ethernet: Fix (nearly-)kernel-doc comments for various functions	2012-07-10 23:13:46 -07:00
ixgb	ixgb: use PCI_VENDOR_ID_INTEL	2012-07-20 10:59:41 -07:00
ixgbe	netvm: propagate page->pfmemalloc from skb_alloc_page to skb	2012-07-31 18:42:46 -07:00
ixgbevf	netvm: propagate page->pfmemalloc from skb_alloc_page to skb	2012-07-31 18:42:46 -07:00
e100.c	net: e100: ucode is optional in some cases	2012-07-19 10:48:07 -07:00
Kconfig	Kconfig: Fix Kconfig for Intel ixgbe and igb PTP support.	2012-06-20 00:52:54 -07:00
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