diff options
| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-03-28 17:48:37 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-03-28 19:36:14 -0700 |
| commit | df4a37d8b53f9fb9af722b056da5edbd9a531768 (patch) | |
| tree | 6935e2eadf67ddc371139569dce030b7dabe4cd1 /drivers/net/ethernet/netronome/nfp/bpf/jit.c | |
| parent | 41aed09cf61c00ef6c3b2648d5a193cbaf2a74d0 (diff) | |
nfp: bpf: add support for bpf_get_prandom_u32()
NFP has a prng register, which we can read to obtain a u32 worth
of pseudo random data. Generate code for it.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/jit.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/jit.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index 62431a0aa0f5..4b631e26f199 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -405,7 +405,7 @@ __emit_lcsr(struct nfp_prog *nfp_prog, u16 areg, u16 breg, bool wr, u16 addr, FIELD_PREP(OP_LCSR_A_SRC, areg) | FIELD_PREP(OP_LCSR_B_SRC, breg) | FIELD_PREP(OP_LCSR_WRITE, wr) | - FIELD_PREP(OP_LCSR_ADDR, addr) | + FIELD_PREP(OP_LCSR_ADDR, addr / 4) | FIELD_PREP(OP_LCSR_SRC_LMEXTN, src_lmextn) | FIELD_PREP(OP_LCSR_DST_LMEXTN, dst_lmextn); @@ -433,10 +433,16 @@ static void emit_csr_wr(struct nfp_prog *nfp_prog, swreg src, u16 addr) return; } - __emit_lcsr(nfp_prog, reg.areg, reg.breg, true, addr / 4, + __emit_lcsr(nfp_prog, reg.areg, reg.breg, true, addr, false, reg.src_lmextn); } +/* CSR value is read in following immed[gpr, 0] */ +static void __emit_csr_rd(struct nfp_prog *nfp_prog, u16 addr) +{ + __emit_lcsr(nfp_prog, 0, 0, false, addr, false, false); +} + static void emit_nop(struct nfp_prog *nfp_prog) { __emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0); @@ -1398,6 +1404,18 @@ map_call_stack_common(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) return 0; } +static int +nfp_get_prandom_u32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) +{ + __emit_csr_rd(nfp_prog, NFP_CSR_PSEUDO_RND_NUM); + /* CSR value is read in following immed[gpr, 0] */ + emit_immed(nfp_prog, reg_both(0), 0, + IMMED_WIDTH_ALL, false, IMMED_SHIFT_0B); + emit_immed(nfp_prog, reg_both(1), 0, + IMMED_WIDTH_ALL, false, IMMED_SHIFT_0B); + return 0; +} + /* --- Callbacks --- */ static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { @@ -2431,6 +2449,8 @@ static int call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) case BPF_FUNC_map_update_elem: case BPF_FUNC_map_delete_elem: return map_call_stack_common(nfp_prog, meta); + case BPF_FUNC_get_prandom_u32: + return nfp_get_prandom_u32(nfp_prog, meta); default: WARN_ONCE(1, "verifier allowed unsupported function\n"); return -EOPNOTSUPP; |