diff options
| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-01-10 12:26:01 +0000 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-01-10 13:49:35 +0100 |
| commit | 2314fe9ed0a1760ceab96b81e6b7181963c93254 (patch) | |
| tree | 235da08eb7d649a9b1dc72ff46bc885a6b743a7c /drivers/net/ethernet/netronome/nfp/bpf/main.h | |
| parent | 488feeaf6d2f9189bdb65f31094a8cff5fcd6c58 (diff) | |
| download | linux-2314fe9ed0a1760ceab96b81e6b7181963c93254.tar.bz2 | |
nfp: bpf: relocate jump targets just before the load
Don't translate the program assuming it will be loaded at a given
address. This will be required for sharing programs between ports
of the same NIC, tail calls and subprograms. It will also make the
jump targets easier to understand when dumping the program to user
space.
Translate the program as if it was going to be loaded at address
zero. When load happens add the load offset in and set addresses
of special branches.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/main.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.h | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index 0b1347f2afd1..5deba5099618 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -42,15 +42,20 @@ #include "../nfp_asm.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, }; enum static_regs { @@ -191,11 +196,9 @@ static inline bool is_mbpf_store(const struct nfp_insn_meta *meta) * @__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 @@ -213,11 +216,9 @@ 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; @@ -231,9 +232,13 @@ 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); @@ -257,4 +262,6 @@ int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn, 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); #endif |