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net/mlx5: E-Switch, Add default drop rule for unmatched packets
The ft_offloads table serves to steer packets, which are from the eswitch, to the representor associated with the packets' source vport. Previously, if a packet's source vport or metadata was not associated with any representor, it was forwarded to the uplink representor. The representor got packets it shouldn't have as they weren't coming from the uplink vport. One such effect of this breakage can be observed if the uplink representor is attached to a bridge, where such illegal packets will be broadcast to the remaining ports, flooding the switch with illegal packets. In the case where IB loopback (e.g, SNAP) is enabled, all transmitted packets would be looped back, and received by the uplink representor, and result in an infinite feedback loop. Therefore, block this hole by adding a default drop rule to the ft_offloads table, so that all unmatched packets with no associated representor are dropped. Signed-off-by: Jianbo Liu <jianbol@nvidia.com> Reviewed-by: Gavi Teitz <gavi@nvidia.com> Reviewed-by: Mark Bloch <mbloch@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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Jianbo Liu
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Saeed Mahameed
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Aug 23, 2022
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