ice: unify xdp_rings accesses

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There has been a long lasting issue of improper xdp_rings indexing for
XDP_TX and XDP_REDIRECT actions. Given that currently rx_ring->q_index
is mixed with smp_processor_id(), there could be a situation where Tx
descriptors are produced onto XDP Tx ring, but tail is never bumped -
for example pin a particular queue id to non-matching IRQ line.

Address this problem by ignoring the user ring count setting and always
initialize the xdp_rings array to be of num_possible_cpus() size. Then,
always use the smp_processor_id() as an index to xdp_rings array. This
provides serialization as at given time only a single softirq can run on
a particular CPU.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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This commit is contained in:

Maciej Fijalkowski 2021-08-19 13:59:59 +02:00 • committed by Tony Nguyen

parent e72bba2135

commit 0bb4f9ecad

3 changed files with 3 additions and 3 deletions

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2

drivers/net/ethernet/intel/ice/ice_lib.c

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2

drivers/net/ethernet/intel/ice/ice_main.c

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2

drivers/net/ethernet/intel/ice/ice_txrx_lib.c

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