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nfp: bpf: save original program length

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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@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jakub Kicinski 2019-01-22 22:45:27 -08:00 committed by Alexei Starovoitov
parent 91a87a5823
commit e2fc61146a
4 changed files with 15 additions and 14 deletions
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4
drivers/net/ethernet/netronome/nfp/bpf/jit.c
View File

@ -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;

6
drivers/net/ethernet/netronome/nfp/bpf/main.h
View File

@ -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);

3
drivers/net/ethernet/netronome/nfp/bpf/offload.c
View File

@ -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;
}

16
drivers/net/ethernet/netronome/nfp/bpf/verifier.c
View File

@ -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 @@ continue_subprog:
/* 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);