[PATCH net-next v6 0/3] net: flower: add cfm support

[PATCH net-next v6 0/3] net: flower: add cfm support

[Zahari Doychev]

From: Zahari Doychev <zdoychev@maxlinear.com>

The first patch adds cfm support to the flow dissector.
The second adds the flower classifier support.
The third adds a selftest for the flower cfm functionality.

iproute2 changes will come in follow up patches.

---
v5->v6
 - do not use NLA_POLICY_NESTED() for cfm_opt_policy attribute

v4->v5
 - fix coding style in flow dissector
 - use strict validation for flower cfm attributes
 - selftest: remove unneeded parameters and configuration
 - selftest: make cfm packet generation code more readable
 - selftest: use the same pref for each filter
 - selftest: check if all filters match

v3->v4
 - use correct size in memchr_inv()
 - remove md level range check and use NLA_POLICY_MAX

v2->v3
 - split the flow dissector and flower changes in separate patches
 - use bit field macros
 - copy separately each cfm key field

v1->v2:
 - add missing comments
 - improve cfm packet dissection
 - move defines to header file
 - fix code formatting
 - remove unneeded attribute defines

rfc->v1:
 - add selftest to the makefile TEST_PROGS.


Zahari Doychev (3):
  net: flow_dissector: add support for cfm packets
  net: flower: add support for matching cfm fields
  selftests: net: add tc flower cfm test

 include/net/flow_dissector.h                  |  21 ++
 include/uapi/linux/pkt_cls.h                  |   9 +
 net/core/flow_dissector.c                     |  30 +++
 net/sched/cls_flower.c                        | 103 +++++++++
 .../testing/selftests/net/forwarding/Makefile |   1 +
 .../selftests/net/forwarding/tc_flower_cfm.sh | 206 ++++++++++++++++++
 6 files changed, 370 insertions(+)
 create mode 100755 tools/testing/selftests/net/forwarding/tc_flower_cfm.sh

-- 
2.41.0

[PATCH net-next v6 1/3] net: flow_dissector: add support for cfm packets

[Zahari Doychev]

From: Zahari Doychev <zdoychev@maxlinear.com>

Add support for dissecting cfm packets. The cfm packet header
fields maintenance domain level and opcode can be dissected.

Signed-off-by: Zahari Doychev <zdoychev@maxlinear.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
 include/net/flow_dissector.h | 21 +++++++++++++++++++++
 net/core/flow_dissector.c    | 30 ++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 8b41668c77fc..8664ed4fbbdf 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -301,6 +301,26 @@ struct flow_dissector_key_l2tpv3 {
 	__be32 session_id;
 };
 
+/**
+ * struct flow_dissector_key_cfm
+ * @mdl_ver: maintenance domain level (mdl) and cfm protocol version
+ * @opcode: code specifying a type of cfm protocol packet
+ *
+ * See 802.1ag, ITU-T G.8013/Y.1731
+ *         1               2
+ * |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | mdl | version |     opcode    |
+ * +-----+---------+-+-+-+-+-+-+-+-+
+ */
+struct flow_dissector_key_cfm {
+	u8	mdl_ver;
+	u8	opcode;
+};
+
+#define FLOW_DIS_CFM_MDL_MASK GENMASK(7, 5)
+#define FLOW_DIS_CFM_MDL_MAX 7
+
 enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
 	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@@ -333,6 +353,7 @@ enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_NUM_OF_VLANS, /* struct flow_dissector_key_num_of_vlans */
 	FLOW_DISSECTOR_KEY_PPPOE, /* struct flow_dissector_key_pppoe */
 	FLOW_DISSECTOR_KEY_L2TPV3, /* struct flow_dissector_key_l2tpv3 */
+	FLOW_DISSECTOR_KEY_CFM, /* struct flow_dissector_key_cfm */
 
 	FLOW_DISSECTOR_KEY_MAX,
 };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 481ca4080cbd..85a2d0d9bd39 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -557,6 +557,30 @@ __skb_flow_dissect_arp(const struct sk_buff *skb,
 	return FLOW_DISSECT_RET_OUT_GOOD;
 }
 
+static enum flow_dissect_ret
+__skb_flow_dissect_cfm(const struct sk_buff *skb,
+		       struct flow_dissector *flow_dissector,
+		       void *target_container, const void *data,
+		       int nhoff, int hlen)
+{
+	struct flow_dissector_key_cfm *key, *hdr, _hdr;
+
+	if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CFM))
+		return FLOW_DISSECT_RET_OUT_GOOD;
+
+	hdr = __skb_header_pointer(skb, nhoff, sizeof(*key), data, hlen, &_hdr);
+	if (!hdr)
+		return FLOW_DISSECT_RET_OUT_BAD;
+
+	key = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_CFM,
+					target_container);
+
+	key->mdl_ver = hdr->mdl_ver;
+	key->opcode = hdr->opcode;
+
+	return FLOW_DISSECT_RET_OUT_GOOD;
+}
+
 static enum flow_dissect_ret
 __skb_flow_dissect_gre(const struct sk_buff *skb,
 		       struct flow_dissector_key_control *key_control,
@@ -1400,6 +1424,12 @@ bool __skb_flow_dissect(const struct net *net,
 		break;
 	}
 
+	case htons(ETH_P_CFM):
+		fdret = __skb_flow_dissect_cfm(skb, flow_dissector,
+					       target_container, data,
+					       nhoff, hlen);
+		break;
+
 	default:
 		fdret = FLOW_DISSECT_RET_OUT_BAD;
 		break;
-- 
2.41.0

[PATCH net-next v6 2/3] net: flower: add support for matching cfm fields

[Zahari Doychev]

From: Zahari Doychev <zdoychev@maxlinear.com>

Add support to the tc flower classifier to match based on fields in CFM
information elements like level and opcode.

tc filter add dev ens6 ingress protocol 802.1q \
	flower vlan_id 698 vlan_ethtype 0x8902 cfm mdl 5 op 46 \
	action drop

Signed-off-by: Zahari Doychev <zdoychev@maxlinear.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
---
 include/uapi/linux/pkt_cls.h |   9 +++
 net/sched/cls_flower.c       | 103 +++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 00933dda7b10..7865f5a9885b 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -596,6 +596,8 @@ enum {
 
 	TCA_FLOWER_L2_MISS,		/* u8 */
 
+	TCA_FLOWER_KEY_CFM,		/* nested */
+
 	__TCA_FLOWER_MAX,
 };
 
@@ -704,6 +706,13 @@ enum {
 	TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST = (1 << 1),
 };
 
+enum {
+	TCA_FLOWER_KEY_CFM_OPT_UNSPEC,
+	TCA_FLOWER_KEY_CFM_MD_LEVEL,
+	TCA_FLOWER_KEY_CFM_OPCODE,
+	TCA_FLOWER_KEY_CFM_OPT_MAX,
+};
+
 #define TCA_FLOWER_MASK_FLAGS_RANGE	(1 << 0) /* Range-based match */
 
 /* Match-all classifier */
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index e02ecabbb75c..b121b979232e 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -11,6 +11,7 @@
 #include <linux/rhashtable.h>
 #include <linux/workqueue.h>
 #include <linux/refcount.h>
+#include <linux/bitfield.h>
 
 #include <linux/if_ether.h>
 #include <linux/in6.h>
@@ -71,6 +72,7 @@ struct fl_flow_key {
 	struct flow_dissector_key_num_of_vlans num_of_vlans;
 	struct flow_dissector_key_pppoe pppoe;
 	struct flow_dissector_key_l2tpv3 l2tpv3;
+	struct flow_dissector_key_cfm cfm;
 } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
 
 struct fl_flow_mask_range {
@@ -725,6 +727,7 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
 	[TCA_FLOWER_KEY_PPP_PROTO]	= { .type = NLA_U16 },
 	[TCA_FLOWER_KEY_L2TPV3_SID]	= { .type = NLA_U32 },
 	[TCA_FLOWER_L2_MISS]		= NLA_POLICY_MAX(NLA_U8, 1),
+	[TCA_FLOWER_KEY_CFM]		= { .type = NLA_NESTED },
 };
 
 static const struct nla_policy
@@ -773,6 +776,12 @@ mpls_stack_entry_policy[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1] = {
 	[TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL]    = { .type = NLA_U32 },
 };
 
+static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
+	[TCA_FLOWER_KEY_CFM_MD_LEVEL]	= NLA_POLICY_MAX(NLA_U8,
+						FLOW_DIS_CFM_MDL_MAX),
+	[TCA_FLOWER_KEY_CFM_OPCODE]	= { .type = NLA_U8 },
+};
+
 static void fl_set_key_val(struct nlattr **tb,
 			   void *val, int val_type,
 			   void *mask, int mask_type, int len)
@@ -1660,6 +1669,54 @@ static bool is_vlan_key(struct nlattr *tb, __be16 *ethertype,
 	return false;
 }
 
+static int fl_set_key_cfm_md_level(struct nlattr **tb,
+				   struct fl_flow_key *key,
+				   struct fl_flow_key *mask,
+				   struct netlink_ext_ack *extack)
+{
+	u8 level;
+
+	if (!tb[TCA_FLOWER_KEY_CFM_MD_LEVEL])
+		return 0;
+
+	level = nla_get_u8(tb[TCA_FLOWER_KEY_CFM_MD_LEVEL]);
+	key->cfm.mdl_ver = FIELD_PREP(FLOW_DIS_CFM_MDL_MASK, level);
+	mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK;
+
+	return 0;
+}
+
+static void fl_set_key_cfm_opcode(struct nlattr **tb,
+				  struct fl_flow_key *key,
+				  struct fl_flow_key *mask,
+				  struct netlink_ext_ack *extack)
+{
+	fl_set_key_val(tb, &key->cfm.opcode, TCA_FLOWER_KEY_CFM_OPCODE,
+		       &mask->cfm.opcode, TCA_FLOWER_UNSPEC,
+		       sizeof(key->cfm.opcode));
+}
+
+static int fl_set_key_cfm(struct nlattr **tb,
+			  struct fl_flow_key *key,
+			  struct fl_flow_key *mask,
+			  struct netlink_ext_ack *extack)
+{
+	struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX];
+	int err;
+
+	if (!tb[TCA_FLOWER_KEY_CFM])
+		return 0;
+
+	err = nla_parse_nested(nla_cfm_opt, TCA_FLOWER_KEY_CFM_OPT_MAX,
+			       tb[TCA_FLOWER_KEY_CFM], cfm_opt_policy, extack);
+	if (err < 0)
+		return err;
+
+	fl_set_key_cfm_opcode(nla_cfm_opt, key, mask, extack);
+
+	return fl_set_key_cfm_md_level(nla_cfm_opt, key, mask, extack);
+}
+
 static int fl_set_key(struct net *net, struct nlattr **tb,
 		      struct fl_flow_key *key, struct fl_flow_key *mask,
 		      struct netlink_ext_ack *extack)
@@ -1814,6 +1871,10 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
 			       TCA_FLOWER_KEY_L2TPV3_SID,
 			       &mask->l2tpv3.session_id, TCA_FLOWER_UNSPEC,
 			       sizeof(key->l2tpv3.session_id));
+	} else if (key->basic.n_proto  == htons(ETH_P_CFM)) {
+		ret = fl_set_key_cfm(tb, key, mask, extack);
+		if (ret)
+			return ret;
 	}
 
 	if (key->basic.ip_proto == IPPROTO_TCP ||
@@ -1996,6 +2057,8 @@ static void fl_init_dissector(struct flow_dissector *dissector,
 			     FLOW_DISSECTOR_KEY_PPPOE, pppoe);
 	FL_KEY_SET_IF_MASKED(mask, keys, cnt,
 			     FLOW_DISSECTOR_KEY_L2TPV3, l2tpv3);
+	FL_KEY_SET_IF_MASKED(mask, keys, cnt,
+			     FLOW_DISSECTOR_KEY_CFM, cfm);
 
 	skb_flow_dissector_init(dissector, keys, cnt);
 }
@@ -3029,6 +3092,43 @@ static int fl_dump_key_ct(struct sk_buff *skb,
 	return -EMSGSIZE;
 }
 
+static int fl_dump_key_cfm(struct sk_buff *skb,
+			   struct flow_dissector_key_cfm *key,
+			   struct flow_dissector_key_cfm *mask)
+{
+	struct nlattr *opts;
+	int err;
+	u8 mdl;
+
+	if (!memchr_inv(mask, 0, sizeof(*mask)))
+		return 0;
+
+	opts = nla_nest_start(skb, TCA_FLOWER_KEY_CFM);
+	if (!opts)
+		return -EMSGSIZE;
+
+	if (FIELD_GET(FLOW_DIS_CFM_MDL_MASK, mask->mdl_ver)) {
+		mdl = FIELD_GET(FLOW_DIS_CFM_MDL_MASK, key->mdl_ver);
+		err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_MD_LEVEL, mdl);
+		if (err)
+			goto err_cfm_opts;
+	}
+
+	if (mask->opcode) {
+		err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_OPCODE, key->opcode);
+		if (err)
+			goto err_cfm_opts;
+	}
+
+	nla_nest_end(skb, opts);
+
+	return 0;
+
+err_cfm_opts:
+	nla_nest_cancel(skb, opts);
+	return err;
+}
+
 static int fl_dump_key_options(struct sk_buff *skb, int enc_opt_type,
 			       struct flow_dissector_key_enc_opts *enc_opts)
 {
@@ -3316,6 +3416,9 @@ static int fl_dump_key(struct sk_buff *skb, struct net *net,
 			     sizeof(key->hash.hash)))
 		goto nla_put_failure;
 
+	if (fl_dump_key_cfm(skb, &key->cfm, &mask->cfm))
+		goto nla_put_failure;
+
 	return 0;
 
 nla_put_failure:
-- 
2.41.0

[PATCH net-next v6 3/3] selftests: net: add tc flower cfm test

[Zahari Doychev]

From: Zahari Doychev <zdoychev@maxlinear.com>

New cfm flower test case is added to the net forwarding selfttests.

Example output:

 # ./tc_flower_cfm.sh p1 p2
 TEST: CFM opcode match test                                         [ OK ]
 TEST: CFM level match test                                          [ OK ]
 TEST: CFM opcode and level match test                               [ OK ]

Signed-off-by: Zahari Doychev <zdoychev@maxlinear.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
---
 .../testing/selftests/net/forwarding/Makefile |   1 +
 .../selftests/net/forwarding/tc_flower_cfm.sh | 206 ++++++++++++++++++
 2 files changed, 207 insertions(+)
 create mode 100755 tools/testing/selftests/net/forwarding/tc_flower_cfm.sh

diff --git a/tools/testing/selftests/net/forwarding/Makefile b/tools/testing/selftests/net/forwarding/Makefile
index 9d0062b542e5..770efbe24f0d 100644
--- a/tools/testing/selftests/net/forwarding/Makefile
+++ b/tools/testing/selftests/net/forwarding/Makefile
@@ -84,6 +84,7 @@ TEST_PROGS = bridge_igmp.sh \
 	tc_flower_router.sh \
 	tc_flower.sh \
 	tc_flower_l2_miss.sh \
+	tc_flower_cfm.sh \
 	tc_mpls_l2vpn.sh \
 	tc_police.sh \
 	tc_shblocks.sh \
diff --git a/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh b/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh
new file mode 100755
index 000000000000..3ca20df952eb
--- /dev/null
+++ b/tools/testing/selftests/net/forwarding/tc_flower_cfm.sh
@@ -0,0 +1,206 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ALL_TESTS="match_cfm_opcode match_cfm_level match_cfm_level_and_opcode"
+NUM_NETIFS=2
+source tc_common.sh
+source lib.sh
+
+h1_create()
+{
+	simple_if_init $h1
+}
+
+h1_destroy()
+{
+	simple_if_fini $h1
+}
+
+h2_create()
+{
+	simple_if_init $h2
+	tc qdisc add dev $h2 clsact
+}
+
+h2_destroy()
+{
+	tc qdisc del dev $h2 clsact
+	simple_if_fini $h2
+}
+
+u8_to_hex()
+{
+	local u8=$1; shift
+
+	printf "%02x" $u8
+}
+
+generate_cfm_hdr()
+{
+	local mdl=$1; shift
+	local op=$1; shift
+	local flags=$1; shift
+	local tlv_offset=$1; shift
+
+	local cfm_hdr=$(:
+	               )"$(u8_to_hex $((mdl << 5))):"$( 	: MD level and Version
+	               )"$(u8_to_hex $op):"$(			: OpCode
+	               )"$(u8_to_hex $flags):"$(		: Flags
+	               )"$(u8_to_hex $tlv_offset)"$(		: TLV offset
+	               )
+
+	echo $cfm_hdr
+}
+
+match_cfm_opcode()
+{
+	local ethtype="89 02"; readonly ethtype
+	RET=0
+
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 101 \
+	   flower cfm op 47 action drop
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 102 \
+	   flower cfm op 43 action drop
+
+	pkt="$ethtype $(generate_cfm_hdr 7 47 0 32)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+	pkt="$ethtype $(generate_cfm_hdr 6 5 0 4)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Did not match on correct opcode"
+
+	tc_check_packets "dev $h2 ingress" 102 0
+	check_err $? "Matched on the wrong opcode"
+
+	pkt="$ethtype $(generate_cfm_hdr 0 43 0 12)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Matched on the wrong opcode"
+
+	tc_check_packets "dev $h2 ingress" 102 1
+	check_err $? "Did not match on correct opcode"
+
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 101 flower
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 102 flower
+
+	log_test "CFM opcode match test"
+}
+
+match_cfm_level()
+{
+	local ethtype="89 02"; readonly ethtype
+	RET=0
+
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 101 \
+	   flower cfm mdl 5 action drop
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 102 \
+	   flower cfm mdl 3 action drop
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 103 \
+	   flower cfm mdl 0 action drop
+
+	pkt="$ethtype $(generate_cfm_hdr 5 42 0 12)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+	pkt="$ethtype $(generate_cfm_hdr 6 1 0 70)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+	pkt="$ethtype $(generate_cfm_hdr 0 1 0 70)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Did not match on correct level"
+
+	tc_check_packets "dev $h2 ingress" 102 0
+	check_err $? "Matched on the wrong level"
+
+	tc_check_packets "dev $h2 ingress" 103 1
+	check_err $? "Did not match on correct level"
+
+	pkt="$ethtype $(generate_cfm_hdr 3 0 0 4)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Matched on the wrong level"
+
+	tc_check_packets "dev $h2 ingress" 102 1
+	check_err $? "Did not match on correct level"
+
+	tc_check_packets "dev $h2 ingress" 103 1
+	check_err $? "Matched on the wrong level"
+
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 101 flower
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 102 flower
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 103 flower
+
+	log_test "CFM level match test"
+}
+
+match_cfm_level_and_opcode()
+{
+	local ethtype="89 02"; readonly ethtype
+	RET=0
+
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 101 \
+	   flower cfm mdl 5 op 41 action drop
+	tc filter add dev $h2 ingress protocol cfm pref 1 handle 102 \
+	   flower cfm mdl 7 op 42 action drop
+
+	pkt="$ethtype $(generate_cfm_hdr 5 41 0 4)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+	pkt="$ethtype $(generate_cfm_hdr 7 3 0 4)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+	pkt="$ethtype $(generate_cfm_hdr 3 42 0 12)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Did not match on correct level and opcode"
+
+	tc_check_packets "dev $h2 ingress" 102 0
+	check_err $? "Matched on the wrong level and opcode"
+
+	pkt="$ethtype $(generate_cfm_hdr 7 42 0 12)"
+	$MZ $h1 -c 1 -p 64 -a $h1mac -b $h2mac "$pkt" -q
+
+	tc_check_packets "dev $h2 ingress" 101 1
+	check_err $? "Matched on the wrong level and opcode"
+
+	tc_check_packets "dev $h2 ingress" 102 1
+	check_err $? "Did not match on correct level and opcode"
+
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 101 flower
+	tc filter del dev $h2 ingress protocol cfm pref 1 handle 102 flower
+
+	log_test "CFM opcode and level match test"
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	h2=${NETIFS[p2]}
+	h1mac=$(mac_get $h1)
+	h2mac=$(mac_get $h2)
+
+	vrf_prepare
+
+	h1_create
+	h2_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	h2_destroy
+	h1_destroy
+
+	vrf_cleanup
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS
-- 
2.41.0

Re: [PATCH net-next v6 2/3] net: flower: add support for matching cfm fields

[Ido Schimmel]

On Tue, Jun 06, 2023 at 10:59:34PM +0200, Zahari Doychev wrote:
> From: Zahari Doychev <zdoychev@maxlinear.com>
> 
> Add support to the tc flower classifier to match based on fields in CFM
> information elements like level and opcode.
> 
> tc filter add dev ens6 ingress protocol 802.1q \
> 	flower vlan_id 698 vlan_ethtype 0x8902 cfm mdl 5 op 46 \
> 	action drop

Looks good overall. One minor comment below.

[...]

> +static int fl_set_key_cfm_md_level(struct nlattr **tb,
> +				   struct fl_flow_key *key,
> +				   struct fl_flow_key *mask,
> +				   struct netlink_ext_ack *extack)
> +{
> +	u8 level;
> +
> +	if (!tb[TCA_FLOWER_KEY_CFM_MD_LEVEL])
> +		return 0;
> +
> +	level = nla_get_u8(tb[TCA_FLOWER_KEY_CFM_MD_LEVEL]);
> +	key->cfm.mdl_ver = FIELD_PREP(FLOW_DIS_CFM_MDL_MASK, level);
> +	mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK;
> +
> +	return 0;
> +}

This function always returns '0' so it can be changed to return 'void'
instead of 'int' like fl_set_key_cfm_opcode().

> +
> +static void fl_set_key_cfm_opcode(struct nlattr **tb,
> +				  struct fl_flow_key *key,
> +				  struct fl_flow_key *mask,
> +				  struct netlink_ext_ack *extack)
> +{
> +	fl_set_key_val(tb, &key->cfm.opcode, TCA_FLOWER_KEY_CFM_OPCODE,
> +		       &mask->cfm.opcode, TCA_FLOWER_UNSPEC,
> +		       sizeof(key->cfm.opcode));
> +}
> +
> +static int fl_set_key_cfm(struct nlattr **tb,
> +			  struct fl_flow_key *key,
> +			  struct fl_flow_key *mask,
> +			  struct netlink_ext_ack *extack)
> +{
> +	struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX];
> +	int err;
> +
> +	if (!tb[TCA_FLOWER_KEY_CFM])
> +		return 0;
> +
> +	err = nla_parse_nested(nla_cfm_opt, TCA_FLOWER_KEY_CFM_OPT_MAX,
> +			       tb[TCA_FLOWER_KEY_CFM], cfm_opt_policy, extack);
> +	if (err < 0)
> +		return err;
> +
> +	fl_set_key_cfm_opcode(nla_cfm_opt, key, mask, extack);
> +
> +	return fl_set_key_cfm_md_level(nla_cfm_opt, key, mask, extack);

And here simply do 'return 0;'.

> +}