From: Saeed Mahameed <sae...@mellanox.com> Date: Sun, 24 Jul 2016 16:12:38 +0300
> This small series from Hadar adds the support for minimum inline > header mode query in mlx5e NIC driver. > > Today on TX the driver copies to the HW descriptor only up to L2 > header which is the default required mode and sufficient for today's > needs. > > The header in the HW descriptor is used for HW loopback steering > decision, without it packets will go directly to the wire with no > questions asked. > > For TX loopback steering according to L2/L3/L4 headers, ConnectX-4 > requires to copy the corresponding headers into the send queue(SQ) > WQE HW descriptor so it can decide whether to loop it back or to > forward to wire. > > For legacy E-Switch mode only L2 headers copy is required. For > advanced steering (E-Switch offloads) more header layers may be > required to be copied, the required mode will be advertised by FW to > each VF and PF according to the corresponding E-Switch > configuration. > > Changes V2: > - Allocate query_nic_vport_context_out on the stack Applied, but even doing an eth_get_headlen() every transmitted packet it really too expensive. You shouldn't be touching networking headers so much when forwarding frames.
