netdev - [PATCH net-next 05/13] nfp: bpf: don't do ld/mask combination if mask is jump destination

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Date:   Thu, 30 Nov 2017 21:32:52 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org
Cc:     oss-drivers@...ronome.com, Jiong Wang <jiong.wang@...ronome.com>
Subject: [PATCH net-next 05/13] nfp: bpf: don't do ld/mask combination if mask is jump destination

From: Jiong Wang <jiong.wang@...ronome.com>

If the mask insn in the ld/mask pair is jump destination, then don't do
combination.

Signed-off-by: Jiong Wang <jiong.wang@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index f76659ecb654..f2317b764222 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -2142,6 +2142,9 @@ static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog)
 		if (next.src_reg || next.dst_reg)
 			continue;
 
+		if (meta2->flags & FLAG_INSN_IS_JUMP_DST)
+			continue;
+
 		meta2->skip = true;
 	}
 }
-- 
2.15.0