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Or Gerlitz says: This series adds support for offloading modifications of packet headers using ConnectX-5 HW header re-write as an action applied during packet steering. The offloaded SW mechanism is TC's pedit action. The offloading is supported for E-Switch steering of VF traffic in the SRIOV switchdev mode and for NIC (non eswitch) RX. One use-case for this offload on virtual networks, is when the hypervisor implements flow based router such as Open-Stack's DVR, where L2 headers of guest packets re-written with routers' MAC addresses and the IP TTL is decremented. Another use case (which can be applied in parallel with routing) is stateless NAT where guest L3/L4 headers are re-written. The series is built as follows: the 1st six patches are preperations which don't yet add new functionality, patches 7-8 add the FW APIs (data-structures and commands) for header re-write, and patch nine allows offloading driver to access pedit keys. The 10th patch is somehow the core of the series, where we translate from the pedit way to represent set of header modification elements to the FW API for that same matter. Once a set of HW modification is established, we register it with the FW and get a modify header ID. When this ID is used with an action during packet steering, the HW applies the header modification on the packet. Patches 11 and 12 implement the above logic as an offload for pedit action for the NIC and E-Switch use-cases. I'd like to thanks Elijah Shakkour <elijahs@mellanox.com> for implementing and helping me testing this functionality on HW simulator, before it could be done with FW. - Or. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJY2lwEAAoJEEg/ir3gV/o+rFIH+wdwGawEjoDhpihLqJHoRtwo Wvy88Lczj++Pfzt9E0kgwgmOdnj7j+GVOh6ALjneE3PDBJEFWG/GWY5aRYonlhhf zibafMTYf+8Dmm9qHW/C4OvhQowSrkG1RDucM2eyjXJfnAShZCh7dV4CDD7paxhu N2rlDdSEl0Im4aPCNHzyrdGg06Fy3A0DQkDvVLIQhKV0cLPIoC0U/i+ymVtsCUY/ sSEEuSohvwdD5Ga5ZZdKicCo61lIRSi2rX5v4sK0exhAO3S8xyrKnwbiN7nVAQqg eVZ/ekbBiksD8MRMKctt/zGxd0X4PDaQ8J9XyF9CL6pRC5VipsDy+P/GEhj/x8U= =l2Qo -----END PGP SIGNATURE----- Merge tag 'mlx5e-pedit' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux Or Gerlitz says: ==================== mlx5e-pedit 2017-03-28 This series adds support for offloading modifications of packet headers using ConnectX-5 HW header re-write as an action applied during packet steering. The offloaded SW mechanism is TC's pedit action. The offloading is supported for E-Switch steering of VF traffic in the SRIOV switchdev mode and for NIC (non eswitch) RX. One use-case for this offload on virtual networks, is when the hypervisor implements flow based router such as Open-Stack's DVR, where L2 headers of guest packets re-written with routers' MAC addresses and the IP TTL is decremented. Another use case (which can be applied in parallel with routing) is stateless NAT where guest L3/L4 headers are re-written. The series is built as follows: the 1st six patches are preperations which don't yet add new functionality, patches 7-8 add the FW APIs (data-structures and commands) for header re-write, and patch nine allows offloading driver to access pedit keys. The 10th patch is somehow the core of the series, where we translate from the pedit way to represent set of header modification elements to the FW API for that same matter. Once a set of HW modification is established, we register it with the FW and get a modify header ID. When this ID is used with an action during packet steering, the HW applies the header modification on the packet. Patches 11 and 12 implement the above logic as an offload for pedit action for the NIC and E-Switch use-cases. I'd like to thanks Elijah Shakkour <elijahs@mellanox.com> for implementing and helping me testing this functionality on HW simulator, before it could be done with FW. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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