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nfp: bpf: add helper for emitting nops

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The need to emitting a few nops will become more common soon
as we add stack and map support.  Add a helper.  This allows
for code to be shorter but also may be handy for marking the
nops with a "reason" to ease applying optimizations.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-10-23 11:58:06 -07:00 committed by David S. Miller
parent a5dd498287
commit ff42bb9fe3
1 changed files with 8 additions and 3 deletions
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11
drivers/net/ethernet/netronome/nfp/bpf/jit.c
View file

@ -494,6 +494,12 @@ static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
return tmp_reg; return tmp_reg;
} }
static void wrp_nops(struct nfp_prog *nfp_prog, unsigned int count)
{
while (count--)
emit_nop(nfp_prog);
}
static void static void
wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask, wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask,
enum br_special special) enum br_special special)
@ -1799,7 +1805,7 @@ static void nfp_outro(struct nfp_prog *nfp_prog)
static int nfp_translate(struct nfp_prog *nfp_prog) static int nfp_translate(struct nfp_prog *nfp_prog)
{ {
struct nfp_insn_meta *meta; struct nfp_insn_meta *meta;
int i, err; int err;
nfp_intro(nfp_prog); nfp_intro(nfp_prog);
if (nfp_prog->error) if (nfp_prog->error)
@ -1831,8 +1837,7 @@ static int nfp_translate(struct nfp_prog *nfp_prog)
if (nfp_prog->error) if (nfp_prog->error)
return nfp_prog->error; return nfp_prog->error;
for (i = 0; i < NFP_USTORE_PREFETCH_WINDOW; i++) wrp_nops(nfp_prog, NFP_USTORE_PREFETCH_WINDOW);
emit_nop(nfp_prog);
if (nfp_prog->error) if (nfp_prog->error)
return nfp_prog->error; return nfp_prog->error;