netdev - [PATCH net-next,v3 2/4] net: flow_offload: bitwise AND on mangle action value field

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Message-Id: <20190906000403.3701-3-pablo@netfilter.org>
Date:   Fri,  6 Sep 2019 02:04:01 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        jakub.kicinski@...ronome.com, jiri@...nulli.us,
        saeedm@...lanox.com, vishal@...lsio.com, vladbu@...lanox.com
Subject: [PATCH net-next,v3 2/4] net: flow_offload: bitwise AND on mangle action value field

Drivers perform a bitwise AND on the value and the mask. Update
tc_setup_flow_action() to perform this operation so drivers do not need
to do this.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c | 3 +--
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c      | 2 +-
 drivers/net/ethernet/netronome/nfp/flower/action.c   | 9 ++++-----
 net/sched/cls_api.c                                  | 3 ++-
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
index 2d26dbca701d..5afc15a60199 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_flower.c
@@ -275,7 +275,6 @@ static int cxgb4_validate_flow_match(struct net_device *dev,
 static void offload_pedit(struct ch_filter_specification *fs, u32 val, u32 mask,
 			  u8 field)
 {
-	u32 set_val = val & mask;
 	u32 offset = 0;
 	u8 size = 1;
 	int i;
@@ -287,7 +286,7 @@ static void offload_pedit(struct ch_filter_specification *fs, u32 val, u32 mask,
 			break;
 		}
 	}
-	memcpy((u8 *)fs + offset, &set_val, size);
+	memcpy((u8 *)fs + offset, &val, size);
 }
 
 static void process_pedit_field(struct ch_filter_specification *fs, u32 val,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 3db63cf41ee5..ec47e994b7e0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2214,7 +2214,7 @@ static int set_pedit_val(u8 hdr_type, u32 mask, u32 val, u32 offset,
 		goto out_err;
 
 	*curr_pmask |= mask;
-	*curr_pval  |= (val & mask);
+	*curr_pval  |= val;
 
 	return 0;
 
diff --git a/drivers/net/ethernet/netronome/nfp/flower/action.c b/drivers/net/ethernet/netronome/nfp/flower/action.c
index ee0066a7ba87..592c36ba9e3f 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/action.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/action.c
@@ -477,7 +477,6 @@ static void nfp_fl_set_helper32(u32 value, u32 mask, u8 *p_exact, u8 *p_mask)
 	u32 oldvalue = get_unaligned((u32 *)p_exact);
 	u32 oldmask = get_unaligned((u32 *)p_mask);
 
-	value &= mask;
 	value |= oldvalue & ~mask;
 
 	put_unaligned(oldmask | mask, (u32 *)p_mask);
@@ -544,7 +543,7 @@ nfp_fl_set_ip4(const struct flow_action_entry *act, u32 off,
 	case offsetof(struct iphdr, daddr):
 		set_ip_addr->ipv4_dst_mask |= mask;
 		set_ip_addr->ipv4_dst &= ~mask;
-		set_ip_addr->ipv4_dst |= exact & mask;
+		set_ip_addr->ipv4_dst |= exact;
 		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
 		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
 					   NFP_FL_LW_SIZ;
@@ -552,7 +551,7 @@ nfp_fl_set_ip4(const struct flow_action_entry *act, u32 off,
 	case offsetof(struct iphdr, saddr):
 		set_ip_addr->ipv4_src_mask |= mask;
 		set_ip_addr->ipv4_src &= ~mask;
-		set_ip_addr->ipv4_src |= exact & mask;
+		set_ip_addr->ipv4_src |= exact;
 		set_ip_addr->head.jump_id = NFP_FL_ACTION_OPCODE_SET_IPV4_ADDRS;
 		set_ip_addr->head.len_lw = sizeof(*set_ip_addr) >>
 					   NFP_FL_LW_SIZ;
@@ -606,7 +605,7 @@ nfp_fl_set_ip6_helper(int opcode_tag, u8 word, __be32 exact, __be32 mask,
 {
 	ip6->ipv6[word].mask |= mask;
 	ip6->ipv6[word].exact &= ~mask;
-	ip6->ipv6[word].exact |= exact & mask;
+	ip6->ipv6[word].exact |= exact;
 
 	ip6->reserved = cpu_to_be16(0);
 	ip6->head.jump_id = opcode_tag;
@@ -651,7 +650,7 @@ nfp_fl_set_ip6_hop_limit_flow_label(u32 off, __be32 exact, __be32 mask,
 
 		ip_hl_fl->ipv6_label_mask |= mask;
 		ip_hl_fl->ipv6_label &= ~mask;
-		ip_hl_fl->ipv6_label |= exact & mask;
+		ip_hl_fl->ipv6_label |= exact;
 		break;
 	}
 
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index fbab004d0075..e30a151d8527 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -3380,7 +3380,8 @@ int tc_setup_flow_action(struct flow_action *flow_action,
 				}
 				entry->mangle.htype = tcf_pedit_htype(act, k);
 				entry->mangle.mask = ~tcf_pedit_mask(act, k);
-				entry->mangle.val = tcf_pedit_val(act, k);
+				entry->mangle.val = tcf_pedit_val(act, k) &
+							entry->mangle.mask;
 				entry->mangle.offset = tcf_pedit_offset(act, k);
 				entry = &flow_action->entries[++j];
 			}
-- 
2.11.0