On 08/07/2016 5:15 AM, Brenden Blanco wrote:
This patch set introduces new infrastructure for programmatically
processing packets in the earliest stages of rx, as part of an effort
others are calling eXpress Data Path (XDP) [1]. Start this effort by
introducing a new bpf program type for early packet filtering, before
even an skb has been allocated.
Extend on this with the ability to modify packet data and send back out
on the same port.
Patch 1 introduces the new prog type and helpers for validating the bpf
program. A new userspace struct is defined containing only data and
data_end as fields, with others to follow in the future.
In patch 2, create a new ndo to pass the fd to supported drivers.
In patch 3, expose a new rtnl option to userspace.
In patch 4, enable support in mlx4 driver.
In patch 5, create a sample drop and count program. With single core,
achieved ~20 Mpps drop rate on a 40G ConnectX3-Pro. This includes
packet data access, bpf array lookup, and increment.
In patch 6, add a page recycle facility to mlx4 rx, enabled when xdp is
active.
In patch 7, add the XDP_TX type to bpf.h
In patch 8, add helper in tx patch for writing tx_desc
In patch 9, add support in mlx4 for packet data write and forwarding
In patch 10, turn on packet write support in the bpf verifier
In patch 11, add a sample program for packet write and forwarding. With
single core, achieved ~10 Mpps rewrite and forwarding.
In patch 12, add prefetch to mlx4 rx to bump forwarding to 12 Mpps
In general, I need some time (2-3 days) to run regression tests over
this updated patch-set, as it does non-trivial changes to our mlx4_en
data-path flows.
Other specific comments will be addressed separately.
Regards,
Tariq
