[PATCHv4 net-next 14/15] nfp: bpf: add support for legacy redirect action

[Jakub Kicinski]

Data path has redirect support so expressing redirect
to the port frame came from is a trivial matter of
setting the right result code.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_bpf.h         | 1 +
 drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c     | 2 ++
 drivers/net/ethernet/netronome/nfp/nfp_net_offload.c | 4 ++++
 3 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h 
b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
index d550fbc4768a..378d3c35cad5 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
@@ -60,6 +60,7 @@ enum static_regs {
 
 enum nfp_bpf_action_type {
        NN_ACT_TC_DROP,
+       NN_ACT_TC_REDIR,
 };
 
 /* Software register representation, hardware encoding in asm.h */
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c 
b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
index 42a8afb67fc8..60a99e0bf459 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
@@ -1440,6 +1440,7 @@ static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
 {
        const u8 act2code[] = {
                [NN_ACT_TC_DROP]  = 0x22,
+               [NN_ACT_TC_REDIR] = 0x24
        };
        /* Target for aborts */
        nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
@@ -1468,6 +1469,7 @@ static void nfp_outro(struct nfp_prog *nfp_prog)
 {
        switch (nfp_prog->act) {
        case NN_ACT_TC_DROP:
+       case NN_ACT_TC_REDIR:
                nfp_outro_tc_legacy(nfp_prog);
                break;
        }
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
index 0537a53e2174..1ec8e5b74651 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
@@ -123,6 +123,10 @@ nfp_net_bpf_get_act(struct nfp_net *nn, struct 
tc_cls_bpf_offload *cls_bpf)
        list_for_each_entry(a, &actions, list) {
                if (is_tcf_gact_shot(a))
                        return NN_ACT_TC_DROP;
+
+               if (is_tcf_mirred_redirect(a) &&
+                   tcf_mirred_ifindex(a) == nn->netdev->ifindex)
+                       return NN_ACT_TC_REDIR;
        }
 
        return -ENOTSUPP;
-- 
1.9.1