i40e: disallow changing the number of descriptors when AF_XDP is on

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When an AF_XDP UMEM is attached to any of the Rx rings, we disallow a
user to change the number of descriptors via e.g. "ethtool -G IFNAME".

Otherwise, the size of the stash/reuse queue can grow unbounded, which
would result in OOM or leaking userspace buffers.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

...

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Björn Töpel 2018-09-07 10:18:48 +02:00 • committed by Jeff Kirsher

parent 411dc16ff1

commit 3ab52af58f

3 changed files with 30 additions and 0 deletions

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8

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

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1

drivers/net/ethernet/intel/i40e/i40e_txrx_common.h

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21

drivers/net/ethernet/intel/i40e/i40e_xsk.c

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