openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

nfp: bpf: relax source operands check 

The NFP normally requires the source operands to be difference addressing
modes, but we should rule out the very special NN_REG_NONE type.

There are instruction that ignores both A/B operands, for example:

  local_csr_rd

For these instructions, we might pass the same operand type, NN_REG_NONE,
for both A/B operands.

NOTE: in current NFP ISA, it is only possible for instructions with
unrestricted operands to take none operands, but in case there is new and
similar instructoin in restricted form, they would follow similar rules,
so swreg_to_restricted is updated as well.

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jiong Wang 2017-11-30 21:32:54 -08:00 committed by Daniel Borkmann
parent 29fe46efba
commit 08859f159e
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ethernet/netronome/nfp/nfp_asm.c
View File

@ -120,7 +120,8 @@ int swreg_to_unrestricted(swreg dst, swreg lreg, swreg rreg,
reg->dst = nfp_swreg_to_unreg(dst, true);
/* Decode source operands */
if (swreg_type(lreg) == swreg_type(rreg))
if (swreg_type(lreg) == swreg_type(rreg) &&
swreg_type(lreg) != NN_REG_NONE)
return -EFAULT;
if (swreg_type(lreg) == NN_REG_GPR_B ||
@ -200,7 +201,8 @@ int swreg_to_restricted(swreg dst, swreg lreg, swreg rreg,
reg->dst = nfp_swreg_to_rereg(dst, true, false, NULL);
/* Decode source operands */
if (swreg_type(lreg) == swreg_type(rreg))
if (swreg_type(lreg) == swreg_type(rreg) &&
swreg_type(lreg) != NN_REG_NONE)
return -EFAULT;
if (swreg_type(lreg) == NN_REG_GPR_B ||