]> git.baikalelectronics.ru Git - kernel.git/commit
ixgbe: update {P}FC thresholds to account for X540 and loopback
authorJohn Fastabend <john.r.fastabend@intel.com>
Tue, 23 Aug 2011 03:14:22 +0000 (03:14 +0000)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Thu, 29 Sep 2011 06:09:59 +0000 (23:09 -0700)
commit98858bb3ce46aee55dd85d54903e653ab7f99ef8
treeb1892a255c4d20c71b66d8a96c0554cc42463863
parent6244d4d529defc87ae1d3fa2d20f06ad26edd9ac
ixgbe: update {P}FC thresholds to account for X540 and loopback

Revise high and low threshold marks wrt flow control to account
for the X540 devices and latency introduced by the loopback
switch.

Without this it was in theory possible to drop frames on a
supposedly lossless link with X540 or SR-IOV enabled.

Previously we used a magic number in a define to calculate the
threshold values. This made it difficult to sort out exactly
which latencies were or were not being accounted for. Here
I was overly explicit and tried to used #define names that would
be recognizable after reading the IEEE 802.1Qbb specification.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c
drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.h
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c
drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
drivers/net/ethernet/intel/ixgbe/ixgbe_type.h