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bpf: make cavium thunder compatible w/ bpf_xdp_adjust_tail 

w/ bpf_xdp_adjust_tail helper xdp's data_end pointer could be changed as
well (only "decrease" of pointer's location is going to be supported).
changing of this pointer will change packet's size.
for cavium's thunder driver we will just calculate packet's length
unconditionally

Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Nikita V. Shirokov <tehnerd@tehnerd.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Nikita V. Shirokov 2018-04-17 21:42:17 -07:00 committed by Daniel Borkmann
parent b968e735c7
commit a48ce00f9a
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/cavium/thunder/nicvf_main.c
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@ -538,9 +538,9 @@ static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog,
action = bpf_prog_run_xdp(prog, &xdp);
rcu_read_unlock();
len = xdp.data_end - xdp.data;
/* Check if XDP program has changed headers */
if (orig_data != xdp.data) {
len = xdp.data_end - xdp.data;
offset = orig_data - xdp.data;
dma_addr -= offset;
}