1 /* 2 * Copyright (C) 2016 Netronome Systems, Inc. 3 * 4 * This software is dual licensed under the GNU General License Version 2, 5 * June 1991 as shown in the file COPYING in the top-level directory of this 6 * source tree or the BSD 2-Clause License provided below. You have the 7 * option to license this software under the complete terms of either license. 8 * 9 * The BSD 2-Clause License: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * 1. Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * 2. Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #ifndef __NFP_BPF_H__ 35 #define __NFP_BPF_H__ 1 36 37 #include <linux/bitfield.h> 38 #include <linux/bpf.h> 39 #include <linux/bpf_verifier.h> 40 #include <linux/list.h> 41 #include <linux/types.h> 42 43 #include "../nfp_asm.h" 44 #include "../nfp_net.h" 45 46 /* For branch fixup logic use up-most byte of branch instruction as scratch 47 * area. Remember to clear this before sending instructions to HW! 48 */ 49 #define OP_BR_SPECIAL 0xff00000000000000ULL 50 51 enum br_special { 52 OP_BR_NORMAL = 0, 53 OP_BR_GO_OUT, 54 OP_BR_GO_ABORT, 55 }; 56 57 enum static_regs { 58 STATIC_REG_IMM = 21, /* Bank AB */ 59 STATIC_REG_STACK = 22, /* Bank A */ 60 STATIC_REG_PKT_LEN = 22, /* Bank B */ 61 }; 62 63 enum pkt_vec { 64 PKT_VEC_PKT_LEN = 0, 65 PKT_VEC_PKT_PTR = 2, 66 }; 67 68 enum nfp_bpf_action_type { 69 NN_ACT_TC_DROP, 70 NN_ACT_TC_REDIR, 71 NN_ACT_DIRECT, 72 NN_ACT_XDP, 73 }; 74 75 #define pv_len(np) reg_lm(1, PKT_VEC_PKT_LEN) 76 #define pv_ctm_ptr(np) reg_lm(1, PKT_VEC_PKT_PTR) 77 78 #define stack_reg(np) reg_a(STATIC_REG_STACK) 79 #define stack_imm(np) imm_b(np) 80 #define plen_reg(np) reg_b(STATIC_REG_PKT_LEN) 81 #define pptr_reg(np) pv_ctm_ptr(np) 82 #define imm_a(np) reg_a(STATIC_REG_IMM) 83 #define imm_b(np) reg_b(STATIC_REG_IMM) 84 #define imm_both(np) reg_both(STATIC_REG_IMM) 85 86 #define NFP_BPF_ABI_FLAGS reg_imm(0) 87 #define NFP_BPF_ABI_FLAG_MARK 1 88 89 struct nfp_prog; 90 struct nfp_insn_meta; 91 typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *); 92 93 #define nfp_prog_first_meta(nfp_prog) \ 94 list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l) 95 #define nfp_prog_last_meta(nfp_prog) \ 96 list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l) 97 #define nfp_meta_next(meta) list_next_entry(meta, l) 98 #define nfp_meta_prev(meta) list_prev_entry(meta, l) 99 100 /** 101 * struct nfp_insn_meta - BPF instruction wrapper 102 * @insn: BPF instruction 103 * @ptr: pointer type for memory operations 104 * @ptr_not_const: pointer is not always constant 105 * @off: index of first generated machine instruction (in nfp_prog.prog) 106 * @n: eBPF instruction number 107 * @skip: skip this instruction (optimized out) 108 * @double_cb: callback for second part of the instruction 109 * @l: link on nfp_prog->insns list 110 */ 111 struct nfp_insn_meta { 112 struct bpf_insn insn; 113 struct bpf_reg_state ptr; 114 bool ptr_not_const; 115 unsigned int off; 116 unsigned short n; 117 bool skip; 118 instr_cb_t double_cb; 119 120 struct list_head l; 121 }; 122 123 #define BPF_SIZE_MASK 0x18 124 125 static inline u8 mbpf_class(const struct nfp_insn_meta *meta) 126 { 127 return BPF_CLASS(meta->insn.code); 128 } 129 130 static inline u8 mbpf_src(const struct nfp_insn_meta *meta) 131 { 132 return BPF_SRC(meta->insn.code); 133 } 134 135 static inline u8 mbpf_op(const struct nfp_insn_meta *meta) 136 { 137 return BPF_OP(meta->insn.code); 138 } 139 140 static inline u8 mbpf_mode(const struct nfp_insn_meta *meta) 141 { 142 return BPF_MODE(meta->insn.code); 143 } 144 145 /** 146 * struct nfp_prog - nfp BPF program 147 * @prog: machine code 148 * @prog_len: number of valid instructions in @prog array 149 * @__prog_alloc_len: alloc size of @prog array 150 * @act: BPF program/action type (TC DA, TC with action, XDP etc.) 151 * @num_regs: number of registers used by this program 152 * @regs_per_thread: number of basic registers allocated per thread 153 * @start_off: address of the first instruction in the memory 154 * @tgt_out: jump target for normal exit 155 * @tgt_abort: jump target for abort (e.g. access outside of packet buffer) 156 * @tgt_done: jump target to get the next packet 157 * @n_translated: number of successfully translated instructions (for errors) 158 * @error: error code if something went wrong 159 * @stack_depth: max stack depth from the verifier 160 * @insns: list of BPF instruction wrappers (struct nfp_insn_meta) 161 */ 162 struct nfp_prog { 163 u64 *prog; 164 unsigned int prog_len; 165 unsigned int __prog_alloc_len; 166 167 enum nfp_bpf_action_type act; 168 169 unsigned int num_regs; 170 unsigned int regs_per_thread; 171 172 unsigned int start_off; 173 unsigned int tgt_out; 174 unsigned int tgt_abort; 175 unsigned int tgt_done; 176 177 unsigned int n_translated; 178 int error; 179 180 unsigned int stack_depth; 181 182 struct list_head insns; 183 }; 184 185 struct nfp_bpf_result { 186 unsigned int n_instr; 187 bool dense_mode; 188 }; 189 190 int 191 nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act, 192 unsigned int prog_start, unsigned int prog_done, 193 unsigned int prog_sz, struct nfp_bpf_result *res); 194 195 int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog); 196 197 struct nfp_net; 198 struct tc_cls_bpf_offload; 199 200 /** 201 * struct nfp_net_bpf_priv - per-vNIC BPF private data 202 * @rx_filter: Filter offload statistics - dropped packets/bytes 203 * @rx_filter_prev: Filter offload statistics - values from previous update 204 * @rx_filter_change: Jiffies when statistics last changed 205 * @rx_filter_stats_timer: Timer for polling filter offload statistics 206 * @rx_filter_lock: Lock protecting timer state changes (teardown) 207 */ 208 struct nfp_net_bpf_priv { 209 struct nfp_stat_pair rx_filter, rx_filter_prev; 210 unsigned long rx_filter_change; 211 struct timer_list rx_filter_stats_timer; 212 struct nfp_net *nn; 213 spinlock_t rx_filter_lock; 214 }; 215 216 int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf); 217 void nfp_net_filter_stats_timer(struct timer_list *t); 218 219 #endif 220