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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>
This commit is contained in:
Jakub Kicinski 2018-01-10 12:26:00 +00:00 committed by Daniel Borkmann
parent 1549921da3
commit 488feeaf6d
3 changed files with 34 additions and 12 deletions
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12
drivers/net/ethernet/netronome/nfp/bpf/jit.c
View File

@ -2110,18 +2110,6 @@ static const instr_cb_t instr_cb[256] = {
[BPF_JMP | BPF_EXIT] = goto_out,
};
/* --- Misc code --- */
static 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);
}
/* --- Assembler logic --- */
static int nfp_fixup_branches(struct nfp_prog *nfp_prog)
{

30
drivers/net/ethernet/netronome/nfp/nfp_asm.c
View File

@ -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;

4
drivers/net/ethernet/netronome/nfp/nfp_asm.h
View File

@ -93,6 +93,10 @@ enum br_ctx_signal_state {
BR_CSS_NONE = 2,
};
u16 br_get_offset(u64 instr);
void br_set_offset(u64 *instr, u16 offset);
void br_add_offset(u64 *instr, u16 offset);
#define OP_BBYTE_BASE 0x0c800000000ULL
#define OP_BB_A_SRC 0x000000000ffULL
#define OP_BB_BYTE 0x00000000300ULL