diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/main.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.h | 207 |
1 files changed, 184 insertions, 23 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index 57b6043177a3..424fe8338105 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016 Netronome Systems, Inc. + * Copyright (C) 2016-2017 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 @@ -37,22 +37,40 @@ #include <linux/bitfield.h> #include <linux/bpf.h> #include <linux/bpf_verifier.h> +#include <linux/kernel.h> #include <linux/list.h> +#include <linux/skbuff.h> #include <linux/types.h> +#include <linux/wait.h> #include "../nfp_asm.h" +#include "fw.h" -/* For branch fixup logic use up-most byte of branch instruction as scratch +/* For relocation 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, +#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, + /* 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_IMM = 21, /* Bank AB */ STATIC_REG_STACK = 22, /* Bank A */ @@ -78,6 +96,89 @@ enum pkt_vec { #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 + * + * @tag_allocator: bitmap of control message tags in use + * @tag_alloc_next: next tag bit to allocate + * @tag_alloc_last: next tag bit to be freed + * + * @cmsg_replies: received cmsg replies waiting to be consumed + * @cmsg_wq: work queue for waiting for cmsg replies + * + * @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 + * + * @adjust_head: adjust head capability + * @flags: extra flags for adjust head + * @off_min: minimal packet offset within buffer required + * @off_max: maximum packet offset within buffer required + * @guaranteed_sub: amount of negative adjustment guaranteed possible + * @guaranteed_add: amount of positive adjustment guaranteed possible + * + * @maps: map capability + * @types: supported map types + * @max_maps: max number of maps supported + * @max_elems: max number of entries in each map + * @max_key_sz: max size of map key + * @max_val_sz: max size of map value + * @max_elem_sz: max size of map entry (key + value) + * + * @helpers: helper addressess for various calls + * @map_lookup: map lookup helper address + */ +struct nfp_app_bpf { + struct nfp_app *app; + + DECLARE_BITMAP(tag_allocator, U16_MAX + 1); + u16 tag_alloc_next; + u16 tag_alloc_last; + + struct sk_buff_head cmsg_replies; + struct wait_queue_head cmsg_wq; + + struct list_head map_list; + unsigned int maps_in_use; + unsigned int map_elems_in_use; + + 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; + } helpers; +}; + +/** + * 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 + * @l: link on the nfp_app_bpf->map_list list + */ +struct nfp_bpf_map { + struct bpf_offloaded_map *offmap; + struct nfp_app_bpf *bpf; + u32 tid; + struct list_head l; +}; + struct nfp_prog; struct nfp_insn_meta; typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *); @@ -89,23 +190,47 @@ typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *); #define nfp_meta_next(meta) list_next_entry(meta, l) #define nfp_meta_prev(meta) list_prev_entry(meta, l) +#define FLAG_INSN_IS_JUMP_DST BIT(0) + /** * 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 + * @jmp_dst: destination info for jump instructions + * @func_id: function id for call instructions + * @arg1: arg1 for call instructions + * @arg2: arg2 for call instructions + * @arg2_var_off: arg2 changes stack offset on different paths * @off: index of first generated machine instruction (in nfp_prog.prog) * @n: eBPF instruction number + * @flags: eBPF instruction extra optimization flags * @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; - struct bpf_reg_state ptr; - bool ptr_not_const; + union { + struct { + struct bpf_reg_state ptr; + struct bpf_insn *paired_st; + s16 ldst_gather_len; + bool ptr_not_const; + }; + struct nfp_insn_meta *jmp_dst; + struct { + u32 func_id; + struct bpf_reg_state arg1; + struct bpf_reg_state arg2; + bool arg2_var_off; + }; + }; unsigned int off; unsigned short n; + unsigned short flags; bool skip; instr_cb_t double_cb; @@ -134,23 +259,36 @@ static inline u8 mbpf_mode(const struct nfp_insn_meta *meta) return BPF_MODE(meta->insn.code); } +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_store(const struct nfp_insn_meta *meta) +{ + return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM); +} + /** * 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 * @verifier_meta: temporary storage for verifier's insn meta * @type: BPF program type - * @start_off: address of the first instruction in the memory + * @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_done: jump target to get the next packet * @n_translated: number of successfully translated instructions (for errors) * @error: error code if something went wrong * @stack_depth: max stack depth from the verifier + * @adjust_head_location: if program has single adjust head call - the insn no. * @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; @@ -159,15 +297,15 @@ struct nfp_prog { enum bpf_prog_type type; - unsigned int start_off; + unsigned int last_bpf_off; unsigned int tgt_out; unsigned int tgt_abort; - unsigned int tgt_done; unsigned int n_translated; int error; unsigned int stack_depth; + unsigned int adjust_head_location; struct list_head insns; }; @@ -175,26 +313,49 @@ struct nfp_prog { /** * 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; }; +void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt); int nfp_bpf_jit(struct nfp_prog *prog); +bool nfp_bpf_supported_opcode(u8 code); -extern const struct bpf_ext_analyzer_ops nfp_bpf_analyzer_ops; +extern const struct bpf_prog_offload_ops nfp_bpf_analyzer_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); - -int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn, - struct netdev_bpf *bpf); -int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn, - struct bpf_prog *prog); -int nfp_bpf_destroy(struct nfp_app *app, 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, unsigned int n_insns); + +void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv); + +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); + +void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb); #endif |