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Date: Fri, 26 Aug 2016 19:06:15 +0100
From: Jakub Kicinski <jakub.kicinski@...ronome.com>
To: netdev@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net,
dinan.gunawardena@...ronome.com, jiri@...nulli.us,
john.fastabend@...il.com, kubakici@...pl,
Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [RFCv2 16/16] nfp: bpf: add offload of TC direct action mode
Add offload of TC in direct action mode. We just need
to provide appropriate checks in the verifier and
a new outro block to translate the exit codes to what
data path expects
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
drivers/net/ethernet/netronome/nfp/nfp_bpf.h | 1 +
drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c | 66 ++++++++++++++++++++++
.../net/ethernet/netronome/nfp/nfp_bpf_verifier.c | 11 +++-
.../net/ethernet/netronome/nfp/nfp_net_offload.c | 6 +-
4 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
index ccb8c2fa20d5..3fd4cf6fa47b 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h
@@ -61,6 +61,7 @@ enum static_regs {
enum nfp_bpf_action_type {
NN_ACT_TC_DROP,
NN_ACT_TC_REDIR,
+ NN_ACT_DIRECT,
};
/* 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 e784ed827afe..1bed2ae05da5 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c
@@ -321,6 +321,16 @@ __emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, enum br_ev_pip ev_pip,
nfp_prog_push(nfp_prog, insn);
}
+static void emit_br_def(struct nfp_prog *nfp_prog, u16 addr, u8 defer)
+{
+ if (defer > 2) {
+ pr_err("BUG: branch defer out of bounds %d\n", defer);
+ nfp_prog->error = -EFAULT;
+ return;
+ }
+ __emit_br(nfp_prog, BR_UNC, BR_EV_PIP_UNCOND, BR_CSS_NONE, addr, defer);
+}
+
static void
emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer)
{
@@ -1465,9 +1475,65 @@ static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
SHF_SC_L_SHF, 16);
}
+static void nfp_outro_tc_da(struct nfp_prog *nfp_prog)
+{
+ /* TC direct-action mode:
+ * 0,1 ok NOT SUPPORTED[1]
+ * 2 drop 0x22 -> drop, count as stat1
+ * 4,5 nuke 0x02 -> drop
+ * 7 redir 0x44 -> redir, count as stat2
+ * * unspec 0x11 -> pass, count as stat0
+ *
+ * [1] We can't support OK and RECLASSIFY because we can't tell TC
+ * the exact decision made. We are forced to support UNSPEC
+ * to handle aborts so that's the only one we handle for passing
+ * packets up the stack.
+ */
+ /* Target for aborts */
+ nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
+
+ emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
+
+ emit_alu(nfp_prog, reg_a(0),
+ reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
+ emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
+
+ /* Target for normal exits */
+ nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
+
+ /* if R0 > 7 jump to abort */
+ emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0));
+ emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
+ emit_alu(nfp_prog, reg_a(0),
+ reg_none(), ALU_OP_NONE, NFP_BPF_ABI_FLAGS);
+
+ wrp_immed(nfp_prog, reg_b(2), 0x41221211);
+ wrp_immed(nfp_prog, reg_b(3), 0x41001211);
+
+ emit_shf(nfp_prog, reg_a(1),
+ reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2);
+
+ emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
+ emit_shf(nfp_prog, reg_a(2),
+ reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
+
+ emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
+ emit_shf(nfp_prog, reg_b(2),
+ reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0);
+
+ emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
+
+ emit_shf(nfp_prog, reg_b(2),
+ reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4);
+ emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
+}
+
static void nfp_outro(struct nfp_prog *nfp_prog)
{
switch (nfp_prog->act) {
+ case NN_ACT_DIRECT:
+ nfp_outro_tc_da(nfp_prog);
+ break;
case NN_ACT_TC_DROP:
case NN_ACT_TC_REDIR:
nfp_outro_tc_legacy(nfp_prog);
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf_verifier.c b/drivers/net/ethernet/netronome/nfp/nfp_bpf_verifier.c
index 8b66d98e37eb..b628836896fa 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_bpf_verifier.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf_verifier.c
@@ -85,7 +85,16 @@ nfp_bpf_check_exit(struct nfp_prog *nfp_prog, const struct verifier_env *env)
return -EINVAL;
}
- if (reg0->imm != 0 && (reg0->imm & ~0U) != ~0U) {
+ if (nfp_prog->act != NN_ACT_DIRECT &&
+ reg0->imm != 0 && (reg0->imm & ~0U) != ~0U) {
+ pr_info("unsupported exit state: %d, imm: %llx\n",
+ reg0->type, reg0->imm);
+ return -EINVAL;
+ }
+
+ if (nfp_prog->act == NN_ACT_DIRECT && reg0->imm <= TC_ACT_REDIRECT &&
+ reg0->imm != TC_ACT_SHOT && reg0->imm != TC_ACT_STOLEN &&
+ reg0->imm != TC_ACT_QUEUED) {
pr_info("unsupported exit state: %d, imm: %llx\n",
reg0->type, reg0->imm);
return -EINVAL;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
index 6399801c4196..a826fa390d4e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_offload.c
@@ -112,8 +112,12 @@ nfp_net_bpf_get_act(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)
LIST_HEAD(actions);
/* TC direct action */
- if (cls_bpf->exts_integrated)
+ if (cls_bpf->exts_integrated) {
+ if (tc_no_actions(cls_bpf->exts))
+ return NN_ACT_DIRECT;
+
return -ENOTSUPP;
+ }
/* TC legacy mode */
if (!tc_single_action(cls_bpf->exts))
--
1.9.1
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