diff options
| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-05-03 18:37:12 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-05-04 23:41:03 +0200 |
| commit | 9816dd35ececc095f3e3be29d30d3adc755908d9 (patch) | |
| tree | 27d3ce05f416a68b1ac0b41140945ea58d036c39 /drivers/net/ethernet/netronome/nfp/bpf/jit.c | |
| parent | f4e3ec0d573e238f383b3da365127002579a07d6 (diff) | |
nfp: bpf: perf event output helpers support
Add support for the perf_event_output family of helpers.
The implementation on the NFP will not match the host code exactly.
The state of the host map and rings is unknown to the device, hence
device can't return errors when rings are not installed. The device
simply packs the data into a firmware notification message and sends
it over to the host, returning success to the program.
There is no notion of a host CPU on the device when packets are being
processed. Device will only offload programs which set BPF_F_CURRENT_CPU.
Still, if map index doesn't match CPU no error will be returned (see
above).
Dropped/lost firmware notification messages will not cause "lost
events" event on the perf ring, they are only visible via device
error counters.
Firmware notification messages may also get reordered in respect
to the packets which caused their generation.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/jit.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/jit.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index 65f0791cae0c..2127cf1548dd 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016-2017 Netronome Systems, Inc. + * Copyright (C) 2016-2018 Netronome Systems, Inc. * * This software is dual licensed under the GNU General License Version 2, * June 1991 as shown in the file COPYING in the top-level directory of this @@ -1456,6 +1456,31 @@ nfp_get_prandom_u32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) return 0; } +static int +nfp_perf_event_output(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) +{ + swreg ptr_type; + u32 ret_tgt; + + ptr_type = ur_load_imm_any(nfp_prog, meta->arg1.type, imm_a(nfp_prog)); + + ret_tgt = nfp_prog_current_offset(nfp_prog) + 3; + + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO + meta->func_id, + 2, RELO_BR_HELPER); + + /* Load ptr type into A1 */ + wrp_mov(nfp_prog, reg_a(1), ptr_type); + + /* Load the return address into B0 */ + wrp_immed_relo(nfp_prog, reg_b(0), ret_tgt, RELO_IMMED_REL); + + if (!nfp_prog_confirm_current_offset(nfp_prog, ret_tgt)) + return -EINVAL; + + return 0; +} + /* --- Callbacks --- */ static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { @@ -2411,6 +2436,8 @@ static int call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) return map_call_stack_common(nfp_prog, meta); case BPF_FUNC_get_prandom_u32: return nfp_get_prandom_u32(nfp_prog, meta); + case BPF_FUNC_perf_event_output: + return nfp_perf_event_output(nfp_prog, meta); default: WARN_ONCE(1, "verifier allowed unsupported function\n"); return -EOPNOTSUPP; @@ -3353,6 +3380,9 @@ void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv) case BPF_FUNC_map_delete_elem: val = nfp_prog->bpf->helpers.map_delete; break; + case BPF_FUNC_perf_event_output: + val = nfp_prog->bpf->helpers.perf_event_output; + break; default: pr_err("relocation of unknown helper %d\n", val); |