igb: Fix queue allocation method to accommodate changing during runtime

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When changing number of queues using ethtool's set_channels during runtime,
a queue allocation could fail, which can leave the device in a down state.
In order to preserve the usability of the device in this scenario, this patch
changes the driver to allocate the  number of queues only if they have not
been allocated already. The first allocation is then done for the max number
of queues, which is the default queues for this driver.   With this change,
queue quantity changes are not subject to queue allocation failures.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Carolyn Wyborny 2013-12-10 07:58:29 +00:00 • committed by Jeff Kirsher

parent 22dd81c5c8

commit 02ef6e1d0b

1 changed files with 44 additions and 22 deletions

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drivers/net/ethernet/intel/igb/igb_main.c

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