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pkt_cls: add new tc cls helper to check offload flag and chain index

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Very few (mlxsw) upstream drivers seem to allow offload of chains
other than 0.  Save driver developers typing and add a helper for
checking both if ethtool's TC offload flag is on and if chain is 0.
This helper will set the extack appropriately in both error cases.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2018-01-25 14:00:43 -08:00 committed by David S. Miller
parent fdd6d771c7
commit 878db9f0f2
1 changed files with 14 additions and 0 deletions
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14
include/net/pkt_cls.h
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@ -656,6 +656,20 @@ static inline bool tc_can_offload_extack(const struct net_device *dev,
return can;
}
static inline bool
tc_cls_can_offload_and_chain0(const struct net_device *dev,
struct tc_cls_common_offload *common)
{
if (!tc_can_offload_extack(dev, common->extack))
return false;
if (common->chain_index) {
NL_SET_ERR_MSG(common->extack,
"Driver supports only offload of chain 0");
return false;
}
return true;
}
static inline bool tc_skip_hw(u32 flags)
{
return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;