From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Thu, 12 Oct 2017 10:34:18 -0700
Subject: nfp: bpf: support direct packet access in TC
Patch-mainline: v4.15-rc1
Git-commit: bfddbc8adcd471806f2369d347a958d11e80f53b
References: bsc#1109837
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/netronome/nfp/bpf/jit.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -1135,12 +1135,25 @@ static int data_ind_ld4(struct nfp_prog
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;