diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfp_bpf.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_bpf.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf.h b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h new file mode 100644 index 000000000000..87aa8a3e9112 --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf.h @@ -0,0 +1,202 @@ +/* + * Copyright (C) 2016 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 + * source tree or the BSD 2-Clause License provided below. You have the + * option to license this software under the complete terms of either license. + * + * The BSD 2-Clause License: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * 2. Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#ifndef __NFP_BPF_H__ +#define __NFP_BPF_H__ 1 + +#include <linux/bitfield.h> +#include <linux/bpf.h> +#include <linux/list.h> +#include <linux/types.h> + +#define FIELD_FIT(mask, val) (!((((u64)val) << __bf_shf(mask)) & ~(mask))) + +/* For branch fixup logic use up-most byte of branch instruction as scratch + * area. Remember to clear this before sending instructions to HW! + */ +#define OP_BR_SPECIAL 0xff00000000000000ULL + +enum br_special { + OP_BR_NORMAL = 0, + OP_BR_GO_OUT, + OP_BR_GO_ABORT, +}; + +enum static_regs { + STATIC_REG_PKT = 1, +#define REG_PKT_BANK ALU_DST_A + STATIC_REG_IMM = 2, /* Bank AB */ +}; + +enum nfp_bpf_action_type { + NN_ACT_TC_DROP, + NN_ACT_TC_REDIR, + NN_ACT_DIRECT, +}; + +/* Software register representation, hardware encoding in asm.h */ +#define NN_REG_TYPE GENMASK(31, 24) +#define NN_REG_VAL GENMASK(7, 0) + +enum nfp_bpf_reg_type { + NN_REG_GPR_A = BIT(0), + NN_REG_GPR_B = BIT(1), + NN_REG_NNR = BIT(2), + NN_REG_XFER = BIT(3), + NN_REG_IMM = BIT(4), + NN_REG_NONE = BIT(5), +}; + +#define NN_REG_GPR_BOTH (NN_REG_GPR_A | NN_REG_GPR_B) + +#define reg_both(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_BOTH)) +#define reg_a(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_A)) +#define reg_b(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_B)) +#define reg_nnr(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_NNR)) +#define reg_xfer(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_XFER)) +#define reg_imm(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_IMM)) +#define reg_none() (FIELD_PREP(NN_REG_TYPE, NN_REG_NONE)) + +#define pkt_reg(np) reg_a((np)->regs_per_thread - STATIC_REG_PKT) +#define imm_a(np) reg_a((np)->regs_per_thread - STATIC_REG_IMM) +#define imm_b(np) reg_b((np)->regs_per_thread - STATIC_REG_IMM) +#define imm_both(np) reg_both((np)->regs_per_thread - STATIC_REG_IMM) + +#define NFP_BPF_ABI_FLAGS reg_nnr(0) +#define NFP_BPF_ABI_FLAG_MARK 1 +#define NFP_BPF_ABI_MARK reg_nnr(1) +#define NFP_BPF_ABI_PKT reg_nnr(2) +#define NFP_BPF_ABI_LEN reg_nnr(3) + +struct nfp_prog; +struct nfp_insn_meta; +typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *); + +#define nfp_prog_first_meta(nfp_prog) \ + list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l) +#define nfp_prog_last_meta(nfp_prog) \ + list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l) +#define nfp_meta_next(meta) list_next_entry(meta, l) +#define nfp_meta_prev(meta) list_prev_entry(meta, l) + +/** + * struct nfp_insn_meta - BPF instruction wrapper + * @insn: BPF instruction + * @off: index of first generated machine instruction (in nfp_prog.prog) + * @n: eBPF instruction number + * @skip: skip this instruction (optimized out) + * @double_cb: callback for second part of the instruction + * @l: link on nfp_prog->insns list + */ +struct nfp_insn_meta { + struct bpf_insn insn; + unsigned int off; + unsigned short n; + bool skip; + instr_cb_t double_cb; + + struct list_head l; +}; + +#define BPF_SIZE_MASK 0x18 + +static inline u8 mbpf_class(const struct nfp_insn_meta *meta) +{ + return BPF_CLASS(meta->insn.code); +} + +static inline u8 mbpf_src(const struct nfp_insn_meta *meta) +{ + return BPF_SRC(meta->insn.code); +} + +static inline u8 mbpf_op(const struct nfp_insn_meta *meta) +{ + return BPF_OP(meta->insn.code); +} + +static inline u8 mbpf_mode(const struct nfp_insn_meta *meta) +{ + return BPF_MODE(meta->insn.code); +} + +/** + * struct nfp_prog - nfp BPF program + * @prog: machine code + * @prog_len: number of valid instructions in @prog array + * @__prog_alloc_len: alloc size of @prog array + * @act: BPF program/action type (TC DA, TC with action, XDP etc.) + * @num_regs: number of registers used by this program + * @regs_per_thread: number of basic registers allocated per thread + * @start_off: address of the first instruction in the memory + * @tgt_out: jump target for normal exit + * @tgt_abort: jump target for abort (e.g. access outside of packet buffer) + * @tgt_done: jump target to get the next packet + * @n_translated: number of successfully translated instructions (for errors) + * @error: error code if something went wrong + * @insns: list of BPF instruction wrappers (struct nfp_insn_meta) + */ +struct nfp_prog { + u64 *prog; + unsigned int prog_len; + unsigned int __prog_alloc_len; + + enum nfp_bpf_action_type act; + + unsigned int num_regs; + unsigned int regs_per_thread; + + unsigned int start_off; + unsigned int tgt_out; + unsigned int tgt_abort; + unsigned int tgt_done; + + unsigned int n_translated; + int error; + + struct list_head insns; +}; + +struct nfp_bpf_result { + unsigned int n_instr; + bool dense_mode; +}; + +int +nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act, + unsigned int prog_start, unsigned int prog_done, + unsigned int prog_sz, struct nfp_bpf_result *res); + +int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog); + +#endif |