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ixgbe: fix parsing of TC actions for HW offload 

The previous code was optimistic, accepting the offload of whole action
chain when there was a single known action (drop/redirect). This results
in offloading a rule which should not be offloaded, because its behavior
cannot be reproduced in the hardware.

For example:

$ tc filter add dev eno1 parent ffff: protocol ip \
    u32 ht 800: order 1 match tcp src 42 FFFF \
    action mirred egress mirror dev enp1s16 pipe \
    drop

The controller is unable to mirror the packet to a VF, but still
offloads the rule by dropping the packet.

Change the approach of the function to a pessimistic one, rejecting the
chain when an unknown action is found. This is better suited for future
extensions.

Note that both recognized actions always return TC_ACT_SHOT, therefore
it is safe to ignore actions behind them.

Signed-off-by: Ondřej Hlavatý <ohlavaty@redhat.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ondřej Hlavatý 2018-05-31 23:21:04 +02:00 committed by David S. Miller
parent 8005b09d99
commit 16e6653c82
1 changed files with 4 additions and 5 deletions
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9
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -9054,7 +9054,6 @@ static int parse_tc_actions(struct ixgbe_adapter *adapter,
{
const struct tc_action *a;
LIST_HEAD(actions);
int err;
if (!tcf_exts_has_actions(exts))
return -EINVAL;
@ -9075,11 +9074,11 @@ static int parse_tc_actions(struct ixgbe_adapter *adapter,
if (!dev)
return -EINVAL;
err = handle_redirect_action(adapter, dev->ifindex, queue,
action);
if (err == 0)
return err;
return handle_redirect_action(adapter, dev->ifindex,
queue, action);
}
return -EINVAL;
}
return -EINVAL;