6  *      0                   1                   2                   3
7  *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
9  *     |0|0|0|0|0|00000|000000000|00000|    Protocol Type for ERSPAN   |
18  *       0                   1                   2                   3
19  *      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
21  *     |0|0|0|1|0|00000|000000000|00000|    Protocol Type for ERSPAN   |
31  *  0                   1                   2                   3
32  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
41  *  0                   1                   2                   3
42  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
58  * GRE proto ERSPAN type I/II = 0x88BE, type III = 0x22EB
66 #define ERSPAN_VERSION	0x1	/* ERSPAN type II */
67 #define VER_MASK	0xf000
68 #define VLAN_MASK	0x0fff
69 #define COS_MASK	0xe000
70 #define EN_MASK		0x1800
71 #define T_MASK		0x0400
72 #define ID_MASK		0x03ff
73 #define INDEX_MASK	0xfffff
75 #define ERSPAN_VERSION2	0x2	/* ERSPAN type III*/
77 #define SGT_MASK	0xffff0000
78 #define P_MASK		0x8000
79 #define FT_MASK		0x7c00
80 #define HWID_MASK	0x03f0
81 #define DIR_MASK	0x0008
82 #define GRA_MASK	0x0006
83 #define O_MASK		0x0001
89 	ERSPAN_ENCAP_NOVLAN = 0x0,	/* originally without VLAN tag */
90 	ERSPAN_ENCAP_ISL = 0x1,		/* originally ISL encapsulated */
91 	ERSPAN_ENCAP_8021Q = 0x2,	/* originally 802.1Q encapsulated */
92 	ERSPAN_ENCAP_INFRAME = 0x3,	/* VLAN tag preserved in frame */
124 	ershdr->session_id = id & 0xff;  in set_session_id()
125 	ershdr->session_id_upper = (id >> 8) & 0x3;  in set_session_id()
135 	ershdr->vlan = vlan & 0xff;  in set_vlan()
136 	ershdr->vlan_upper = (vlan >> 8) & 0xf;  in set_vlan()
146 	md2->hwid = hwid & 0xf;  in set_hwid()
147 	md2->hwid_upper = (hwid >> 4) & 0x3;  in set_hwid()
157 	if (version == 0)  in erspan_hdr_len()
158 		return 0;  in erspan_hdr_len()
184 	u16 vlan_tci = 0;  in erspan_build_header()
190 			(ipv6_hdr(skb)->flow_lbl[0] >> 4);  in erspan_build_header()
205 	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V1_MDSIZE);  in erspan_build_header()
247 	BSO_NOERROR = 0x0,
248 	BSO_SHORT = 0x1,
249 	BSO_OVERSIZED = 0x2,
250 	BSO_BAD = 0x3,
278 	u16 vlan_tci = 0;  in erspan_build_header_v2()
279 	u8 gra = 0; /* 100 usec */  in erspan_build_header_v2()
280 	u8 bso = 0; /* Bad/Short/Oversized */  in erspan_build_header_v2()
281 	u8 sgt = 0;  in erspan_build_header_v2()
286 			(ipv6_hdr(skb)->flow_lbl[0] >> 4);  in erspan_build_header_v2()
299 	memset(ershdr, 0, sizeof(*ershdr) + ERSPAN_V2_MDSIZE);  in erspan_build_header_v2()
314 	md2->ft = 0;  in erspan_build_header_v2()
317 	md2->o = 0;  in erspan_build_header_v2()