diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/main.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.h | 615 |
1 files changed, 615 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h new file mode 100644 index 0000000000..16841bb750 --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -0,0 +1,615 @@ +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */ +/* Copyright (C) 2016-2018 Netronome Systems, Inc. */ + +#ifndef __NFP_BPF_H__ +#define __NFP_BPF_H__ 1 + +#include <linux/bitfield.h> +#include <linux/bpf.h> +#include <linux/bpf_verifier.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/rhashtable.h> +#include <linux/skbuff.h> +#include <linux/types.h> +#include <linux/wait.h> + +#include "../ccm.h" +#include "../nfp_asm.h" +#include "fw.h" + +#define cmsg_warn(bpf, msg...) nn_dp_warn(&(bpf)->app->ctrl->dp, msg) + +/* For relocation logic use up-most byte of branch instruction as scratch + * area. Remember to clear this before sending instructions to HW! + */ +#define OP_RELO_TYPE 0xff00000000000000ULL + +enum nfp_relo_type { + RELO_NONE = 0, + /* standard internal jumps */ + RELO_BR_REL, + /* internal jumps to parts of the outro */ + RELO_BR_GO_OUT, + RELO_BR_GO_ABORT, + RELO_BR_GO_CALL_PUSH_REGS, + RELO_BR_GO_CALL_POP_REGS, + /* external jumps to fixed addresses */ + RELO_BR_NEXT_PKT, + RELO_BR_HELPER, + /* immediate relocation against load address */ + RELO_IMMED_REL, +}; + +/* 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_IMMA = 20, /* Bank AB */ + STATIC_REG_IMM = 21, /* Bank AB */ + STATIC_REG_STACK = 22, /* Bank A */ + STATIC_REG_PKT_LEN = 22, /* Bank B */ +}; + +enum pkt_vec { + PKT_VEC_PKT_LEN = 0, + PKT_VEC_PKT_PTR = 2, + PKT_VEC_QSEL_SET = 4, + PKT_VEC_QSEL_VAL = 6, +}; + +#define PKT_VEL_QSEL_SET_BIT 4 + +#define pv_len(np) reg_lm(1, PKT_VEC_PKT_LEN) +#define pv_ctm_ptr(np) reg_lm(1, PKT_VEC_PKT_PTR) +#define pv_qsel_set(np) reg_lm(1, PKT_VEC_QSEL_SET) +#define pv_qsel_val(np) reg_lm(1, PKT_VEC_QSEL_VAL) + +#define stack_reg(np) reg_a(STATIC_REG_STACK) +#define stack_imm(np) imm_b(np) +#define plen_reg(np) reg_b(STATIC_REG_PKT_LEN) +#define pptr_reg(np) pv_ctm_ptr(np) +#define imm_a(np) reg_a(STATIC_REG_IMM) +#define imm_b(np) reg_b(STATIC_REG_IMM) +#define imma_a(np) reg_a(STATIC_REG_IMMA) +#define imma_b(np) reg_b(STATIC_REG_IMMA) +#define imm_both(np) reg_both(STATIC_REG_IMM) +#define ret_reg(np) imm_a(np) + +#define NFP_BPF_ABI_FLAGS reg_imm(0) +#define NFP_BPF_ABI_FLAG_MARK 1 + +/** + * struct nfp_app_bpf - bpf app priv structure + * @app: backpointer to the app + * @ccm: common control message handler data + * + * @bpf_dev: BPF offload device handle + * + * @cmsg_key_sz: size of key in cmsg element array + * @cmsg_val_sz: size of value in cmsg element array + * + * @map_list: list of offloaded maps + * @maps_in_use: number of currently offloaded maps + * @map_elems_in_use: number of elements allocated to offloaded maps + * + * @maps_neutral: hash table of offload-neutral maps (on pointer) + * + * @abi_version: global BPF ABI version + * @cmsg_cache_cnt: number of entries to read for caching + * + * @adjust_head: adjust head capability + * @adjust_head.flags: extra flags for adjust head + * @adjust_head.off_min: minimal packet offset within buffer required + * @adjust_head.off_max: maximum packet offset within buffer required + * @adjust_head.guaranteed_sub: negative adjustment guaranteed possible + * @adjust_head.guaranteed_add: positive adjustment guaranteed possible + * + * @maps: map capability + * @maps.types: supported map types + * @maps.max_maps: max number of maps supported + * @maps.max_elems: max number of entries in each map + * @maps.max_key_sz: max size of map key + * @maps.max_val_sz: max size of map value + * @maps.max_elem_sz: max size of map entry (key + value) + * + * @helpers: helper addressess for various calls + * @helpers.map_lookup: map lookup helper address + * @helpers.map_update: map update helper address + * @helpers.map_delete: map delete helper address + * @helpers.perf_event_output: output perf event to a ring buffer + * + * @pseudo_random: FW initialized the pseudo-random machinery (CSRs) + * @queue_select: BPF can set the RX queue ID in packet vector + * @adjust_tail: BPF can simply trunc packet size for adjust tail + * @cmsg_multi_ent: FW can pack multiple map entries in a single cmsg + */ +struct nfp_app_bpf { + struct nfp_app *app; + struct nfp_ccm ccm; + + struct bpf_offload_dev *bpf_dev; + + unsigned int cmsg_key_sz; + unsigned int cmsg_val_sz; + + unsigned int cmsg_cache_cnt; + + struct list_head map_list; + unsigned int maps_in_use; + unsigned int map_elems_in_use; + + struct rhashtable maps_neutral; + + u32 abi_version; + + struct nfp_bpf_cap_adjust_head { + u32 flags; + int off_min; + int off_max; + int guaranteed_sub; + int guaranteed_add; + } adjust_head; + + struct { + u32 types; + u32 max_maps; + u32 max_elems; + u32 max_key_sz; + u32 max_val_sz; + u32 max_elem_sz; + } maps; + + struct { + u32 map_lookup; + u32 map_update; + u32 map_delete; + u32 perf_event_output; + } helpers; + + bool pseudo_random; + bool queue_select; + bool adjust_tail; + bool cmsg_multi_ent; +}; + +enum nfp_bpf_map_use { + NFP_MAP_UNUSED = 0, + NFP_MAP_USE_READ, + NFP_MAP_USE_WRITE, + NFP_MAP_USE_ATOMIC_CNT, +}; + +struct nfp_bpf_map_word { + unsigned char type :4; + unsigned char non_zero_update :1; +}; + +#define NFP_BPF_MAP_CACHE_CNT 4U +#define NFP_BPF_MAP_CACHE_TIME_NS (250 * 1000) + +/** + * struct nfp_bpf_map - private per-map data attached to BPF maps for offload + * @offmap: pointer to the offloaded BPF map + * @bpf: back pointer to bpf app private structure + * @tid: table id identifying map on datapath + * + * @cache_lock: protects @cache_blockers, @cache_to, @cache + * @cache_blockers: number of ops in flight which block caching + * @cache_gen: counter incremented by every blocker on exit + * @cache_to: time when cache will no longer be valid (ns) + * @cache: skb with cached response + * + * @l: link on the nfp_app_bpf->map_list list + * @use_map: map of how the value is used (in 4B chunks) + */ +struct nfp_bpf_map { + struct bpf_offloaded_map *offmap; + struct nfp_app_bpf *bpf; + u32 tid; + + spinlock_t cache_lock; + u32 cache_blockers; + u32 cache_gen; + u64 cache_to; + struct sk_buff *cache; + + struct list_head l; + struct nfp_bpf_map_word use_map[]; +}; + +struct nfp_bpf_neutral_map { + struct rhash_head l; + struct bpf_map *ptr; + u32 map_id; + u32 count; +}; + +extern const struct rhashtable_params nfp_bpf_maps_neutral_params; + +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_bpf_reg_state - register state for calls + * @reg: BPF register state from latest path + * @var_off: for stack arg - changes stack offset on different paths + */ +struct nfp_bpf_reg_state { + struct bpf_reg_state reg; + bool var_off; +}; + +#define FLAG_INSN_IS_JUMP_DST BIT(0) +#define FLAG_INSN_IS_SUBPROG_START BIT(1) +#define FLAG_INSN_PTR_CALLER_STACK_FRAME BIT(2) +/* Instruction is pointless, noop even on its own */ +#define FLAG_INSN_SKIP_NOOP BIT(3) +/* Instruction is optimized out based on preceding instructions */ +#define FLAG_INSN_SKIP_PREC_DEPENDENT BIT(4) +/* Instruction is optimized by the verifier */ +#define FLAG_INSN_SKIP_VERIFIER_OPT BIT(5) +/* Instruction needs to zero extend to high 32-bit */ +#define FLAG_INSN_DO_ZEXT BIT(6) + +#define FLAG_INSN_SKIP_MASK (FLAG_INSN_SKIP_NOOP | \ + FLAG_INSN_SKIP_PREC_DEPENDENT | \ + FLAG_INSN_SKIP_VERIFIER_OPT) + +/** + * struct nfp_insn_meta - BPF instruction wrapper + * @insn: BPF instruction + * @ptr: pointer type for memory operations + * @ldst_gather_len: memcpy length gathered from load/store sequence + * @paired_st: the paired store insn at the head of the sequence + * @ptr_not_const: pointer is not always constant + * @pkt_cache: packet data cache information + * @pkt_cache.range_start: start offset for associated packet data cache + * @pkt_cache.range_end: end offset for associated packet data cache + * @pkt_cache.do_init: this read needs to initialize packet data cache + * @xadd_over_16bit: 16bit immediate is not guaranteed + * @xadd_maybe_16bit: 16bit immediate is possible + * @jmp_dst: destination info for jump instructions + * @jump_neg_op: jump instruction has inverted immediate, use ADD instead of SUB + * @num_insns_after_br: number of insns following a branch jump, used for fixup + * @func_id: function id for call instructions + * @arg1: arg1 for call instructions + * @arg2: arg2 for call instructions + * @umin_src: copy of core verifier umin_value for src opearnd. + * @umax_src: copy of core verifier umax_value for src operand. + * @umin_dst: copy of core verifier umin_value for dst opearnd. + * @umax_dst: copy of core verifier umax_value for dst operand. + * @off: index of first generated machine instruction (in nfp_prog.prog) + * @n: eBPF instruction number + * @flags: eBPF instruction extra optimization flags + * @subprog_idx: index of subprogram to which the instruction belongs + * @double_cb: callback for second part of the instruction + * @l: link on nfp_prog->insns list + */ +struct nfp_insn_meta { + struct bpf_insn insn; + union { + /* pointer ops (ld/st/xadd) */ + struct { + struct bpf_reg_state ptr; + struct bpf_insn *paired_st; + s16 ldst_gather_len; + bool ptr_not_const; + struct { + s16 range_start; + s16 range_end; + bool do_init; + } pkt_cache; + bool xadd_over_16bit; + bool xadd_maybe_16bit; + }; + /* jump */ + struct { + struct nfp_insn_meta *jmp_dst; + bool jump_neg_op; + u32 num_insns_after_br; /* only for BPF-to-BPF calls */ + }; + /* function calls */ + struct { + u32 func_id; + struct bpf_reg_state arg1; + struct nfp_bpf_reg_state arg2; + }; + /* We are interested in range info for operands of ALU + * operations. For example, shift amount, multiplicand and + * multiplier etc. + */ + struct { + u64 umin_src; + u64 umax_src; + u64 umin_dst; + u64 umax_dst; + }; + }; + unsigned int off; + unsigned short n; + unsigned short flags; + unsigned short subprog_idx; + 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); +} + +static inline bool is_mbpf_alu(const struct nfp_insn_meta *meta) +{ + return mbpf_class(meta) == BPF_ALU64 || mbpf_class(meta) == BPF_ALU; +} + +static inline bool is_mbpf_load(const struct nfp_insn_meta *meta) +{ + return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM); +} + +static inline bool is_mbpf_jmp32(const struct nfp_insn_meta *meta) +{ + return mbpf_class(meta) == BPF_JMP32; +} + +static inline bool is_mbpf_jmp64(const struct nfp_insn_meta *meta) +{ + return mbpf_class(meta) == BPF_JMP; +} + +static inline bool is_mbpf_jmp(const struct nfp_insn_meta *meta) +{ + return is_mbpf_jmp32(meta) || is_mbpf_jmp64(meta); +} + +static inline bool is_mbpf_store(const struct nfp_insn_meta *meta) +{ + return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM); +} + +static inline bool is_mbpf_load_pkt(const struct nfp_insn_meta *meta) +{ + return is_mbpf_load(meta) && meta->ptr.type == PTR_TO_PACKET; +} + +static inline bool is_mbpf_store_pkt(const struct nfp_insn_meta *meta) +{ + return is_mbpf_store(meta) && meta->ptr.type == PTR_TO_PACKET; +} + +static inline bool is_mbpf_classic_load(const struct nfp_insn_meta *meta) +{ + u8 code = meta->insn.code; + + return BPF_CLASS(code) == BPF_LD && + (BPF_MODE(code) == BPF_ABS || BPF_MODE(code) == BPF_IND); +} + +static inline bool is_mbpf_classic_store(const struct nfp_insn_meta *meta) +{ + u8 code = meta->insn.code; + + return BPF_CLASS(code) == BPF_ST && BPF_MODE(code) == BPF_MEM; +} + +static inline bool is_mbpf_classic_store_pkt(const struct nfp_insn_meta *meta) +{ + return is_mbpf_classic_store(meta) && meta->ptr.type == PTR_TO_PACKET; +} + +static inline bool is_mbpf_atomic(const struct nfp_insn_meta *meta) +{ + return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_ATOMIC); +} + +static inline bool is_mbpf_mul(const struct nfp_insn_meta *meta) +{ + return is_mbpf_alu(meta) && mbpf_op(meta) == BPF_MUL; +} + +static inline bool is_mbpf_div(const struct nfp_insn_meta *meta) +{ + return is_mbpf_alu(meta) && mbpf_op(meta) == BPF_DIV; +} + +static inline bool is_mbpf_cond_jump(const struct nfp_insn_meta *meta) +{ + u8 op; + + if (is_mbpf_jmp32(meta)) + return true; + + if (!is_mbpf_jmp64(meta)) + return false; + + op = mbpf_op(meta); + return op != BPF_JA && op != BPF_EXIT && op != BPF_CALL; +} + +static inline bool is_mbpf_helper_call(const struct nfp_insn_meta *meta) +{ + struct bpf_insn insn = meta->insn; + + return insn.code == (BPF_JMP | BPF_CALL) && + insn.src_reg != BPF_PSEUDO_CALL; +} + +static inline bool is_mbpf_pseudo_call(const struct nfp_insn_meta *meta) +{ + struct bpf_insn insn = meta->insn; + + return insn.code == (BPF_JMP | BPF_CALL) && + insn.src_reg == BPF_PSEUDO_CALL; +} + +#define STACK_FRAME_ALIGN 64 + +/** + * struct nfp_bpf_subprog_info - nfp BPF sub-program (a.k.a. function) info + * @stack_depth: maximum stack depth used by this sub-program + * @needs_reg_push: whether sub-program uses callee-saved registers + */ +struct nfp_bpf_subprog_info { + u16 stack_depth; + u8 needs_reg_push : 1; +}; + +/** + * struct nfp_prog - nfp BPF program + * @bpf: backpointer to the bpf app priv structure + * @prog: machine code + * @prog_len: number of valid instructions in @prog array + * @__prog_alloc_len: alloc size of @prog array + * @stack_size: total amount of stack used + * @verifier_meta: temporary storage for verifier's insn meta + * @type: BPF program type + * @last_bpf_off: address of the last instruction translated from BPF + * @tgt_out: jump target for normal exit + * @tgt_abort: jump target for abort (e.g. access outside of packet buffer) + * @tgt_call_push_regs: jump target for subroutine for saving R6~R9 to stack + * @tgt_call_pop_regs: jump target for subroutine used for restoring R6~R9 + * @n_translated: number of successfully translated instructions (for errors) + * @error: error code if something went wrong + * @stack_frame_depth: max stack depth for current frame + * @adjust_head_location: if program has single adjust head call - the insn no. + * @map_records_cnt: the number of map pointers recorded for this prog + * @subprog_cnt: number of sub-programs, including main function + * @map_records: the map record pointers from bpf->maps_neutral + * @subprog: pointer to an array of objects holding info about sub-programs + * @n_insns: number of instructions on @insns list + * @insns: list of BPF instruction wrappers (struct nfp_insn_meta) + */ +struct nfp_prog { + struct nfp_app_bpf *bpf; + + u64 *prog; + unsigned int prog_len; + unsigned int __prog_alloc_len; + + unsigned int stack_size; + + struct nfp_insn_meta *verifier_meta; + + enum bpf_prog_type type; + + unsigned int last_bpf_off; + unsigned int tgt_out; + unsigned int tgt_abort; + unsigned int tgt_call_push_regs; + unsigned int tgt_call_pop_regs; + + unsigned int n_translated; + int error; + + unsigned int stack_frame_depth; + unsigned int adjust_head_location; + + unsigned int map_records_cnt; + unsigned int subprog_cnt; + struct nfp_bpf_neutral_map **map_records; + struct nfp_bpf_subprog_info *subprog; + + unsigned int n_insns; + struct list_head insns; +}; + +/** + * struct nfp_bpf_vnic - per-vNIC BPF priv structure + * @tc_prog: currently loaded cls_bpf program + * @start_off: address of the first instruction in the memory + * @tgt_done: jump target to get the next packet + */ +struct nfp_bpf_vnic { + struct bpf_prog *tc_prog; + unsigned int start_off; + unsigned int tgt_done; +}; + +bool nfp_is_subprog_start(struct nfp_insn_meta *meta); +void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog); +int nfp_bpf_jit(struct nfp_prog *prog); +bool nfp_bpf_supported_opcode(u8 code); +bool nfp_bpf_offload_check_mtu(struct nfp_net *nn, struct bpf_prog *prog, + unsigned int mtu); + +int nfp_verify_insn(struct bpf_verifier_env *env, int insn_idx, + int prev_insn_idx); +int nfp_bpf_finalize(struct bpf_verifier_env *env); + +int nfp_bpf_opt_replace_insn(struct bpf_verifier_env *env, u32 off, + struct bpf_insn *insn); +int nfp_bpf_opt_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt); + +extern const struct bpf_prog_offload_ops nfp_bpf_dev_ops; + +struct netdev_bpf; +struct nfp_app; +struct nfp_net; + +int nfp_ndo_bpf(struct nfp_app *app, struct nfp_net *nn, + struct netdev_bpf *bpf); +int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog, + bool old_prog, struct netlink_ext_ack *extack); + +struct nfp_insn_meta * +nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, + unsigned int insn_idx); + +void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv); + +unsigned int nfp_bpf_ctrl_cmsg_min_mtu(struct nfp_app_bpf *bpf); +unsigned int nfp_bpf_ctrl_cmsg_mtu(struct nfp_app_bpf *bpf); +unsigned int nfp_bpf_ctrl_cmsg_cache_cnt(struct nfp_app_bpf *bpf); +long long int +nfp_bpf_ctrl_alloc_map(struct nfp_app_bpf *bpf, struct bpf_map *map); +void +nfp_bpf_ctrl_free_map(struct nfp_app_bpf *bpf, struct nfp_bpf_map *nfp_map); +int nfp_bpf_ctrl_getfirst_entry(struct bpf_offloaded_map *offmap, + void *next_key); +int nfp_bpf_ctrl_update_entry(struct bpf_offloaded_map *offmap, + void *key, void *value, u64 flags); +int nfp_bpf_ctrl_del_entry(struct bpf_offloaded_map *offmap, void *key); +int nfp_bpf_ctrl_lookup_entry(struct bpf_offloaded_map *offmap, + void *key, void *value); +int nfp_bpf_ctrl_getnext_entry(struct bpf_offloaded_map *offmap, + void *key, void *next_key); + +int nfp_bpf_event_output(struct nfp_app_bpf *bpf, const void *data, + unsigned int len); + +void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb); +void +nfp_bpf_ctrl_msg_rx_raw(struct nfp_app *app, const void *data, + unsigned int len); +#endif |