nfp: bpf: copy eBPF subprograms information from kernel verifier

Browse source

In order to support BPF-to-BPF calls in offloaded programs, the nfp
driver must collect information about the distinct subprograms: namely,
the number of subprograms composing the complete program and the stack
depth of those subprograms. The latter in particular is non-trivial to
collect, so we copy those elements from the kernel verifier via the
newly added post-verification hook. The struct nfp_prog is extended to
store this information. Stack depths are stored in an array of dedicated
structs.

Subprogram start indexes are not collected. Instead, meta instructions
associated to the start of a subprogram will be marked with a flag in a
later patch.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

...

This commit is contained in:

Quentin Monnet 2018-10-07 12:56:49 +01:00 • committed by Daniel Borkmann

parent 1a7e62e632

commit c5da54d93e

3 changed files with 29 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

12

drivers/net/ethernet/netronome/nfp/bpf/main.h

View file

2

drivers/net/ethernet/netronome/nfp/bpf/offload.c

View file

15

drivers/net/ethernet/netronome/nfp/bpf/verifier.c

View file