diff options
| author | Jakub Kicinski | 2018-01-10 13:26:03 +0100 |
|---|---|---|
| committer | Daniel Borkmann | 2018-01-10 13:49:35 +0100 |
| commit | e84797fe159c8f849edd96ab72cc21eb890656fe (patch) | |
| tree | d1e9fd638d1b424fcb83d6970fcbf6528e87b829 /drivers/net/ethernet/netronome/nfp/bpf | |
| parent | nfp: bpf: don't depend on high order allocations for program image (diff) | |
| download | kernel-qcow2-linux-e84797fe159c8f849edd96ab72cc21eb890656fe.tar.gz kernel-qcow2-linux-e84797fe159c8f849edd96ab72cc21eb890656fe.tar.xz kernel-qcow2-linux-e84797fe159c8f849edd96ab72cc21eb890656fe.zip | |
nfp: bpf: use a large constant in unresolved branches
To make absolute relocated branches (branches which will be completely
rewritten with br_set_offset()) distinguishable in user space dumps
from normal jumps add a large offset to them.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/jit.c | 14 | ||||
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.h | 6 |
2 files changed, 13 insertions, 7 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index 5deebbc18cfd..b4ed6bca4ea9 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -739,7 +739,7 @@ construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset, u16 src, u8 size) imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size)); emit_alu(nfp_prog, reg_none(), plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog)); - emit_br_relo(nfp_prog, BR_BLO, 0, 0, RELO_BR_GO_ABORT); + emit_br_relo(nfp_prog, BR_BLO, BR_OFF_RELO, 0, RELO_BR_GO_ABORT); /* Load data */ return data_ld(nfp_prog, imm_b(nfp_prog), 0, size); @@ -752,7 +752,7 @@ static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size) /* Check packet length */ tmp_reg = ur_load_imm_any(nfp_prog, offset + size, imm_a(nfp_prog)); emit_alu(nfp_prog, reg_none(), plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg); - emit_br_relo(nfp_prog, BR_BLO, 0, 0, RELO_BR_GO_ABORT); + emit_br_relo(nfp_prog, BR_BLO, BR_OFF_RELO, 0, RELO_BR_GO_ABORT); /* Load data */ tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog)); @@ -2026,7 +2026,7 @@ static int call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - emit_br_relo(nfp_prog, BR_UNC, 0, 0, RELO_BR_GO_OUT); + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 0, RELO_BR_GO_OUT); return 0; } @@ -2175,7 +2175,7 @@ static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) /* Target for aborts */ nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); - emit_br_relo(nfp_prog, BR_UNC, 0, 2, RELO_BR_NEXT_PKT); + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16); @@ -2202,7 +2202,7 @@ static void nfp_outro_tc_da(struct nfp_prog *nfp_prog) emit_shf(nfp_prog, reg_b(2), reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0); - emit_br_relo(nfp_prog, BR_UNC, 0, 2, RELO_BR_NEXT_PKT); + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); emit_shf(nfp_prog, reg_b(2), reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4); @@ -2221,7 +2221,7 @@ static void nfp_outro_xdp(struct nfp_prog *nfp_prog) /* Target for aborts */ nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog); - emit_br_relo(nfp_prog, BR_UNC, 0, 2, RELO_BR_NEXT_PKT); + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16); @@ -2242,7 +2242,7 @@ static void nfp_outro_xdp(struct nfp_prog *nfp_prog) emit_shf(nfp_prog, reg_b(2), reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0); - emit_br_relo(nfp_prog, BR_UNC, 0, 2, RELO_BR_NEXT_PKT); + emit_br_relo(nfp_prog, BR_UNC, BR_OFF_RELO, 2, RELO_BR_NEXT_PKT); wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS); emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16); diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index 5deba5099618..8d02c39b9b10 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -58,6 +58,12 @@ enum nfp_relo_type { RELO_BR_NEXT_PKT, }; +/* To make absolute relocated branches (branches other than RELO_BR_REL) + * distinguishable in user space dumps from normal jumps, add a large offset + * to them. + */ +#define BR_OFF_RELO 15000 + enum static_regs { STATIC_REG_IMM = 21, /* Bank AB */ STATIC_REG_STACK = 22, /* Bank A */ |