diff options
| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-01-10 12:26:00 +0000 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-01-10 13:49:35 +0100 |
| commit | 488feeaf6d2f9189bdb65f31094a8cff5fcd6c58 (patch) | |
| tree | 635d27a12d0d09171a494dfb44ec42717d419782 /drivers/net/ethernet/netronome/nfp/nfp_asm.c | |
| parent | 1549921da3e8efb6c95e39444c67ed1729a0ccaf (diff) | |
nfp: bpf: add helpers for modifying branch addresses
In preparation for better handling of relocations move existing
helper for setting branch offset to nfp_asm.c and add two more.
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/nfp_asm.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_asm.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_asm.c b/drivers/net/ethernet/netronome/nfp/nfp_asm.c index d3610987fb07..9ee3a3f60cc7 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_asm.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_asm.c @@ -50,6 +50,36 @@ const struct cmd_tgt_act cmd_tgt_act[__CMD_TGT_MAP_SIZE] = { [CMD_TGT_READ_SWAP_LE] = { 0x03, 0x40 }, }; +u16 br_get_offset(u64 instr) +{ + u16 addr_lo, addr_hi; + + addr_lo = FIELD_GET(OP_BR_ADDR_LO, instr); + addr_hi = FIELD_GET(OP_BR_ADDR_HI, instr); + + return (addr_hi * ((OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)) + 1)) | + addr_lo; +} + +void br_set_offset(u64 *instr, u16 offset) +{ + u16 addr_lo, addr_hi; + + addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO)); + addr_hi = offset != addr_lo; + *instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO); + *instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi); + *instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo); +} + +void br_add_offset(u64 *instr, u16 offset) +{ + u16 addr; + + addr = br_get_offset(*instr); + br_set_offset(instr, addr + offset); +} + static u16 nfp_swreg_to_unreg(swreg reg, bool is_dst) { bool lm_id, lm_dec = false; |