nfp: bpf: fix code-gen bug on BPF_ALU | BPF_XOR | BPF_K

mainline inclusion
from mainline-5.0
commit f036ebd9
category: bugfix
bugzilla: 10913
CVE: NA

-------------------------------------------------

The intended optimization should be A ^ 0 = A, not A ^ -1 = A.

Fixes: cd7df56e ("nfp: add BPF to NFP code translator")
Reviewed-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: NJiong Wang <jiong.wang@netronome.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NZhiqiang Liu <liuzhiqiang26@huawei.com>
Reviewed-by: NMao Wenan <maowenan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/ethernet/netronome/nfp/bpf/jit.c

@@ -2306,7 +2306,7 @@ static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 
 static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
 {
-	return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm);
+	return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm);
 }
 
 static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)