D39536.diff
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	diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
	--- a/sys/net/if_ethersubr.c
	+++ b/sys/net/if_ethersubr.c
	@@ -123,6 +123,8 @@
	struct sockaddr *);
	static int ether_requestencap(struct ifnet , struct if_encap_req );

	+static inline bool ether_do_pcp(struct ifnet , struct mbuf );
	+
	#define senderr(e) do { error = (e); goto bad;} while (0)

	static void
	@@ -470,11 +472,7 @@
	int
	ether_output_frame(struct ifnet ifp, struct mbuf m)
	{
	- uint8_t pcp;
	-
	- pcp = ifp->if_pcp;
	- if (pcp != IFNET_PCP_NONE && ifp->if_type != IFT_L2VLAN &&
	- !ether_set_pcp(&m, ifp, pcp))
	+ if (ether_do_pcp(ifp, m) && !ether_set_pcp(&m, ifp, ifp->if_pcp))
	return (0);

	if (PFIL_HOOKED_OUT(V_link_pfil_head))
	@@ -1400,6 +1398,19 @@
	&VNET_NAME(vlan_mtag_pcp), 0,
	"Retain VLAN PCP information as packets are passed up the stack");

	+static inline bool
	+ether_do_pcp(struct ifnet ifp, struct mbuf m)
	+{
	+ if (ifp->if_type == IFT_L2VLAN)
	+ return (false);
	+ if (ifp->if_pcp != IFNET_PCP_NONE \|\| (m->m_flags & M_VLANTAG) != 0)
	+ return (true);
	+ if (V_vlan_mtag_pcp &&
	+ m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL) != NULL)
	+ return (true);
	+ return (false);
	+}
	+
	bool
	ether_8021q_frame(struct mbuf *mp, struct ifnet ife, struct ifnet *p,
	const struct ether_8021q_tag *qtag)