Re: [PATCH 1/1] ixgbe: write flush vfta registers

After several week tests, your advice still make this bug appear. But
my patch make this bug disappear.

Zhu Yanjun

On Thu, Nov 17, 2016 at 5:33 PM, zhuyj [off-list ref] wrote:

Sure. From the following.
"
VLAN Filter. Each bit ‘i’ in register ‘n’ affects packets with VLAN
tags equal to 32*n+i.
128 VLAN Filter registers compose a table of 4096 bits that cover all
possible VLAN
tags.
Each bit when set, enables packets with the associated VLAN tags to
pass. Each bit
when cleared, blocks packets with this VLAN tag.
"
Your suggestions seems reasonable. Please wait. I will make tests to
vefiry your suggestions.

I will keep you update.

On Wed, Nov 16, 2016 at 10:05 PM, Lino Sanfilippo [off-list ref] wrote:

quoted

Hi,

quoted

Sometimes vfta registers can not be written successfully in dcb mode.
This is very occassional. When the ixgbe nic runs for a very long time,
sometimes this bug occurs. But after IXGBE_WRITE_FLUSH is executed,
this bug never occurs.

Signed-off-by: Zhu Yanjun <zyjzyj2000@gmail.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index bd93d82..1221cfb 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -4138,8 +4138,10 @@ static void ixgbe_vlan_promisc_enable(struct ixgbe_adapter *adapter)
      }

      /* Set all bits in the VLAN filter table array */
-     for (i = hw->mac.vft_size; i--;)
+     for (i = hw->mac.vft_size; i--;) {
              IXGBE_WRITE_REG(hw, IXGBE_VFTA(i), ~0U);
+             IXGBE_WRITE_FLUSH(hw);
+     }

Should it not be sufficient to do the flush only once, at the end of the function?

Regards,
Lino

------------------------------------------------------------------------------
Developer Access Program for Intel Xeon Phi Processors
Access to Intel Xeon Phi processor-based developer platforms.
With one year of Intel Parallel Studio XE.
Training and support from Colfax.
Order your platform today.http://sdm.link/xeonphi
_______________________________________________
E1000-devel mailing list
E1000-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/e1000-devel
To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired