drivers/net/ethernet/netronome/nfp/bpf/main.h

   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
  45 /* For branch fixup logic use up-most byte of branch instruction as scratch
  46  * area.  Remember to clear this before sending instructions to HW!
  47  */
  48 #define OP_BR_SPECIAL   0xff00000000000000ULL
  49
  50 enum br_special {
  51         OP_BR_NORMAL = 0,
  52         OP_BR_GO_OUT,
  53         OP_BR_GO_ABORT,
  54 };
  55
  56 enum static_regs {
  57         STATIC_REG_IMM          = 21, /* Bank AB */
  58         STATIC_REG_STACK        = 22, /* Bank A */
  59         STATIC_REG_PKT_LEN      = 22, /* Bank B */
  60 };
  61
  62 enum pkt_vec {
  63         PKT_VEC_PKT_LEN         = 0,
  64         PKT_VEC_PKT_PTR         = 2,
  65 };
  66
  67 #define pv_len(np)      reg_lm(1, PKT_VEC_PKT_LEN)
  68 #define pv_ctm_ptr(np)  reg_lm(1, PKT_VEC_PKT_PTR)
  69
  70 #define stack_reg(np)   reg_a(STATIC_REG_STACK)
  71 #define stack_imm(np)   imm_b(np)
  72 #define plen_reg(np)    reg_b(STATIC_REG_PKT_LEN)
  73 #define pptr_reg(np)    pv_ctm_ptr(np)
  74 #define imm_a(np)       reg_a(STATIC_REG_IMM)
  75 #define imm_b(np)       reg_b(STATIC_REG_IMM)
  76 #define imm_both(np)    reg_both(STATIC_REG_IMM)
  77
  78 #define NFP_BPF_ABI_FLAGS       reg_imm(0)
  79 #define   NFP_BPF_ABI_FLAG_MARK 1
  80
  81 struct nfp_prog;
  82 struct nfp_insn_meta;
  83 typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
  84
  85 #define nfp_prog_first_meta(nfp_prog)                                   \
  86         list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
  87 #define nfp_prog_last_meta(nfp_prog)                                    \
  88         list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
  89 #define nfp_meta_next(meta)     list_next_entry(meta, l)
  90 #define nfp_meta_prev(meta)     list_prev_entry(meta, l)
  91
  92 /**
  93  * struct nfp_insn_meta - BPF instruction wrapper
  94  * @insn: BPF instruction
  95  * @ptr: pointer type for memory operations
  96  * @ptr_not_const: pointer is not always constant
  97  * @off: index of first generated machine instruction (in nfp_prog.prog)
  98  * @n: eBPF instruction number
  99  * @skip: skip this instruction (optimized out)
 100  * @double_cb: callback for second part of the instruction
 101  * @l: link on nfp_prog->insns list
 102  */
 103 struct nfp_insn_meta {
 104         struct bpf_insn insn;
 105         struct bpf_reg_state ptr;
 106         bool ptr_not_const;
 107         unsigned int off;
 108         unsigned short n;
 109         bool skip;
 110         instr_cb_t double_cb;
 111
 112         struct list_head l;
 113 };
 114
 115 #define BPF_SIZE_MASK   0x18
 116
 117 static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
 118 {
 119         return BPF_CLASS(meta->insn.code);
 120 }
 121
 122 static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
 123 {
 124         return BPF_SRC(meta->insn.code);
 125 }
 126
 127 static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
 128 {
 129         return BPF_OP(meta->insn.code);
 130 }
 131
 132 static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
 133 {
 134         return BPF_MODE(meta->insn.code);
 135 }
 136
 137 /**
 138  * struct nfp_prog - nfp BPF program
 139  * @prog: machine code
 140  * @prog_len: number of valid instructions in @prog array
 141  * @__prog_alloc_len: alloc size of @prog array
 142  * @verifier_meta: temporary storage for verifier's insn meta
 143  * @type: BPF program type
 144  * @start_off: address of the first instruction in the memory
 145  * @tgt_out: jump target for normal exit
 146  * @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
 147  * @tgt_done: jump target to get the next packet
 148  * @n_translated: number of successfully translated instructions (for errors)
 149  * @error: error code if something went wrong
 150  * @stack_depth: max stack depth from the verifier
 151  * @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
 152  */
 153 struct nfp_prog {
 154         u64 *prog;
 155         unsigned int prog_len;
 156         unsigned int __prog_alloc_len;
 157
 158         struct nfp_insn_meta *verifier_meta;
 159
 160         enum bpf_prog_type type;
 161
 162         unsigned int start_off;
 163         unsigned int tgt_out;
 164         unsigned int tgt_abort;
 165         unsigned int tgt_done;
 166
 167         unsigned int n_translated;
 168         int error;
 169
 170         unsigned int stack_depth;
 171
 172         struct list_head insns;
 173 };
 174
 175 /**
 176  * struct nfp_bpf_vnic - per-vNIC BPF priv structure
 177  * @tc_prog:    currently loaded cls_bpf program
 178  */
 179 struct nfp_bpf_vnic {
 180         struct bpf_prog *tc_prog;
 181 };
 182
 183 int nfp_bpf_jit(struct nfp_prog *prog);
 184
 185 extern const struct bpf_ext_analyzer_ops nfp_bpf_analyzer_ops;
 186
 187 struct netdev_bpf;
 188 struct nfp_app;
 189 struct nfp_net;
 190
 191 int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
 192                         bool old_prog);
 193
 194 int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
 195                           struct netdev_bpf *bpf);
 196 int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
 197                       struct bpf_prog *prog);
 198 int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
 199                     struct bpf_prog *prog);
 200 #endif