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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>
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parent
e663fe3863
commit
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1 changed files with 15 additions and 2 deletions
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@ -1135,12 +1135,25 @@ static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
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static int mem_ldx_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
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u8 size)
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{
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swreg dst = reg_both(meta->insn.dst_reg * 2);
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switch (meta->insn.off) {
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case offsetof(struct sk_buff, len):
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if (size != FIELD_SIZEOF(struct sk_buff, len))
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return -EOPNOTSUPP;
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wrp_mov(nfp_prog,
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reg_both(meta->insn.dst_reg * 2), plen_reg(nfp_prog));
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wrp_mov(nfp_prog, dst, plen_reg(nfp_prog));
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break;
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case offsetof(struct sk_buff, data):
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if (size != sizeof(void *))
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return -EOPNOTSUPP;
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wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog));
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break;
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case offsetof(struct sk_buff, cb) +
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offsetof(struct bpf_skb_data_end, data_end):
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if (size != sizeof(void *))
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return -EOPNOTSUPP;
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emit_alu(nfp_prog, dst,
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plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog));
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break;
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default:
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return -EOPNOTSUPP;
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