ixgbe: update {P}FC thresholds to account for X540 and loopback

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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>

...

This commit is contained in:

John Fastabend 2011-08-23 03:14:22 +00:00 • committed by Jeff Kirsher

parent 934c18cc5a

commit 9da712d2ed

7 changed files with 190 additions and 38 deletions

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8

drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c

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drivers/net/ethernet/intel/ixgbe/ixgbe_common.c

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drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.h

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drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c

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drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c

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drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

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drivers/net/ethernet/intel/ixgbe/ixgbe_type.h

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