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Message-Id: <20190101013743.23935-11-jakub.kicinski@netronome.com>
Date: Mon, 31 Dec 2018 17:37:41 -0800
From: Jakub Kicinski <jakub.kicinski@...ronome.com>
To: alexei.starovoitov@...il.com, daniel@...earbox.net, yhs@...com
Cc: netdev@...r.kernel.org, oss-drivers@...ronome.com,
Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [RFC bpf-next v4 10/12] nfp: bpf: save original program length
Instead of passing env->prog->len around, and trying to adjust
for optimized out instructions just save the initial number
of instructions in struct nfp_prog.
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
---
drivers/net/ethernet/netronome/nfp/bpf/jit.c | 4 ++--
drivers/net/ethernet/netronome/nfp/bpf/main.h | 6 ++++--
drivers/net/ethernet/netronome/nfp/bpf/offload.c | 3 ++-
.../net/ethernet/netronome/nfp/bpf/verifier.c | 16 +++++++---------
4 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index 054382b9cbe6..3308fd92c017 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -4327,7 +4327,7 @@ int nfp_bpf_jit(struct nfp_prog *nfp_prog)
return ret;
}
-void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt)
+void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta;
@@ -4355,7 +4355,7 @@ void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt)
else
dst_idx = meta->n + 1 + meta->insn.off;
- dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_idx, cnt);
+ dst_meta = nfp_bpf_goto_meta(nfp_prog, meta, dst_idx);
if (pseudo_call)
dst_meta->flags |= FLAG_INSN_IS_SUBPROG_START;
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h
index 40291aedd895..07879eee3d46 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/main.h
+++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h
@@ -462,6 +462,7 @@ struct nfp_bpf_subprog_info {
* @subprog_cnt: number of sub-programs, including main function
* @map_records: the map record pointers from bpf->maps_neutral
* @subprog: pointer to an array of objects holding info about sub-programs
+ * @n_insns: number of instructions on @insns list
* @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
*/
struct nfp_prog {
@@ -494,6 +495,7 @@ struct nfp_prog {
struct nfp_bpf_neutral_map **map_records;
struct nfp_bpf_subprog_info *subprog;
+ unsigned int n_insns;
struct list_head insns;
};
@@ -510,7 +512,7 @@ struct nfp_bpf_vnic {
};
bool nfp_is_subprog_start(struct nfp_insn_meta *meta);
-void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt);
+void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog);
int nfp_bpf_jit(struct nfp_prog *prog);
bool nfp_bpf_supported_opcode(u8 code);
@@ -531,7 +533,7 @@ int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
struct nfp_insn_meta *
nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
- unsigned int insn_idx, unsigned int n_insns);
+ unsigned int insn_idx);
void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv);
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/offload.c b/drivers/net/ethernet/netronome/nfp/bpf/offload.c
index f0283854fade..c10aab392cf6 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/offload.c
@@ -163,8 +163,9 @@ nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog,
list_add_tail(&meta->l, &nfp_prog->insns);
}
+ nfp_prog->n_insns = cnt;
- nfp_bpf_jit_prepare(nfp_prog, cnt);
+ nfp_bpf_jit_prepare(nfp_prog);
return 0;
}
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/verifier.c b/drivers/net/ethernet/netronome/nfp/bpf/verifier.c
index 337bb862ec1d..2712ab17d57c 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/verifier.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/verifier.c
@@ -18,15 +18,15 @@
struct nfp_insn_meta *
nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
- unsigned int insn_idx, unsigned int n_insns)
+ unsigned int insn_idx)
{
unsigned int forward, backward, i;
backward = meta->n - insn_idx;
forward = insn_idx - meta->n;
- if (min(forward, backward) > n_insns - insn_idx - 1) {
- backward = n_insns - insn_idx - 1;
+ if (min(forward, backward) > nfp_prog->n_insns - insn_idx - 1) {
+ backward = nfp_prog->n_insns - insn_idx - 1;
meta = nfp_prog_last_meta(nfp_prog);
}
if (min(forward, backward) > insn_idx && backward > insn_idx) {
@@ -629,7 +629,7 @@ int nfp_verify_insn(struct bpf_verifier_env *env, int insn_idx,
struct nfp_prog *nfp_prog = env->prog->aux->offload->dev_priv;
struct nfp_insn_meta *meta = nfp_prog->verifier_meta;
- meta = nfp_bpf_goto_meta(nfp_prog, meta, insn_idx, env->prog->len);
+ meta = nfp_bpf_goto_meta(nfp_prog, meta, insn_idx);
nfp_prog->verifier_meta = meta;
if (!nfp_bpf_supported_opcode(meta->insn.code)) {
@@ -690,8 +690,7 @@ nfp_assign_subprog_idx_and_regs(struct bpf_verifier_env *env,
return 0;
}
-static unsigned int
-nfp_bpf_get_stack_usage(struct nfp_prog *nfp_prog, unsigned int cnt)
+static unsigned int nfp_bpf_get_stack_usage(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta = nfp_prog_first_meta(nfp_prog);
unsigned int max_depth = 0, depth = 0, frame = 0;
@@ -726,7 +725,7 @@ nfp_bpf_get_stack_usage(struct nfp_prog *nfp_prog, unsigned int cnt)
/* Find the callee and start processing it. */
meta = nfp_bpf_goto_meta(nfp_prog, meta,
- meta->n + 1 + meta->insn.imm, cnt);
+ meta->n + 1 + meta->insn.imm);
idx = meta->subprog_idx;
frame++;
goto process_subprog;
@@ -778,8 +777,7 @@ int nfp_bpf_finalize(struct bpf_verifier_env *env)
nn = netdev_priv(env->prog->aux->offload->netdev);
max_stack = nn_readb(nn, NFP_NET_CFG_BPF_STACK_SZ) * 64;
- nfp_prog->stack_size = nfp_bpf_get_stack_usage(nfp_prog,
- env->prog->len);
+ nfp_prog->stack_size = nfp_bpf_get_stack_usage(nfp_prog);
if (nfp_prog->stack_size > max_stack) {
pr_vlog(env, "stack too large: program %dB > FW stack %dB\n",
nfp_prog->stack_size, max_stack);
--
2.19.2
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