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nfp: bpf: support direct packet access in TC 

Add support for direct packet access in TC, note that because
writing the packet will cause the verifier to generate a csum
fixup prologue we won't be able to offload packet writes from
TC, just yet, only the reads will work.

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>
hifive-unleashed-5.1
Jakub Kicinski 2017-10-12 10:34:18 -07:00 committed by David S. Miller
parent e663fe3863
commit bfddbc8adc
1 changed files with 15 additions and 2 deletions
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17
drivers/net/ethernet/netronome/nfp/bpf/jit.c
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@ -1135,12 +1135,25 @@ static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
static int mem_ldx_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
u8 size)
{
swreg dst = reg_both(meta->insn.dst_reg * 2);
switch (meta->insn.off) {
case offsetof(struct sk_buff, len):
if (size != FIELD_SIZEOF(struct sk_buff, len))
return -EOPNOTSUPP;
wrp_mov(nfp_prog,
reg_both(meta->insn.dst_reg * 2), plen_reg(nfp_prog));
wrp_mov(nfp_prog, dst, plen_reg(nfp_prog));
break;
case offsetof(struct sk_buff, data):
if (size != sizeof(void *))
return -EOPNOTSUPP;
wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog));
break;
case offsetof(struct sk_buff, cb) +
offsetof(struct bpf_skb_data_end, data_end):
if (size != sizeof(void *))
return -EOPNOTSUPP;
emit_alu(nfp_prog, dst,
plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog));
break;
default:
return -EOPNOTSUPP;