ixgbe: Update DESC_NEEDED define to adjust for changes to MAX_SKB_FRAGS

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Recent changes have made it so that MAX_SKB_FRAGS is now never less than 16.
As a result we were seeing issues on systems with 64K pages as it would
cause DESC_NEEDED to increase to 68, and we would need over 136 descriptors
free before clean_tx_irq would wake the queue.

This patch makes it so that DESC_NEEDED is always MAX_SKB_FRAGS + 4.  This
should prevent any possible deadlocks on the systems with 64K pages as we will
now only require 42 descriptors to wake.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Alexander Duyck 2013-01-26 02:08:14 +00:00 • committed by Jeff Kirsher

parent 67da097e12

commit 990a315800

1 changed files with 1 additions and 1 deletions

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

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