nfp: bpf: add support for direct packet access - read

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In direct packet access bound checks are already done, we can
simply dereference the packet pointer.

Verifier/parser logic needs to record pointer type.  Note that
although verifier does protect us from CTX vs other pointer
changes we will also want to differentiate between PACKET vs
MAP_VALUE or STACK, so we can add the check already.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Jakub Kicinski 2017-10-12 10:34:16 -07:00 • committed by David S. Miller

parent 0a7939775f

commit 2ca71441f5

5 changed files with 105 additions and 11 deletions

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85

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

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3

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

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21

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

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3

drivers/net/ethernet/netronome/nfp/nfp_asm.c

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4

drivers/net/ethernet/netronome/nfp/nfp_asm.h

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