Re: [PATCH RFC v2 1/8] xdp: Infrastructure to generalize XDP

Thu, Feb 09, 2017 at 12:41:20AM CET, tom@herbertland.com wrote:

This patch creates an infrastructure for registering and running code at
XDP hooks in drivers. This extends and generalizes the original XDP/BPF
interface. Specifically, it defines a generic xdp_hook structure and a
set of hooks that can be assigned to devices or napi instances.  These
hooks are also generic to allow for XDP/BPF programs as well as non-BPF
code (e.g. kernel code can be written in a module).

An XDP hook is defined by the xdp_hook structure. A pointer to this
structure is passed into the XDP register function to set up a hook.
The XDP register function mallocs its own xdp_hook structure and copies
the values from the xdp_hook passed in. The register function also saves
the pointer value of the xdp_hook argument; this pointer is used in
subsequently calls to XDP to identify the registered hook.

The interface is defined in net/xdp.h. This includes the definition of
xdp_hook, functions to register and unregister hooks on a device
or individual instances of napi, and xdp_hook_run that is called by
drivers to run the hooks.

Signed-off-by: Tom Herbert <redacted>
---
drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c |   1 +
include/linux/filter.h                           |  10 +-
include/linux/netdev_features.h                  |   3 +-
include/linux/netdevice.h                        |  16 ++
include/net/xdp.h                                | 310 +++++++++++++++++++++++
include/trace/events/xdp.h                       |  31 +++
kernel/bpf/core.c                                |   1 +
net/core/Makefile                                |   2 +-
net/core/dev.c                                   |  53 ++--
net/core/filter.c                                |   1 +
net/core/rtnetlink.c                             |  14 +-
net/core/xdp.c                                   | 304 ++++++++++++++++++++++
12 files changed, 711 insertions(+), 35 deletions(-)
create mode 100644 include/net/xdp.h
create mode 100644 net/core/xdp.c

[...]

typo

+ * the calling drivers have been patched.
+ */