1 /*
2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
4  *
5  * This program is free software; you may redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; version 2 of the License.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16  * SOFTWARE.
17  *
18  */
19 
20 #ifndef _RQ_ENET_DESC_H_
21 #define _RQ_ENET_DESC_H_
22 
23 /* Ethernet receive queue descriptor: 16B */
24 struct rq_enet_desc {
25 	__le64 address;
26 	__le16 length_type;
27 	u8 reserved[6];
28 };
29 
30 enum rq_enet_type_types {
31 	RQ_ENET_TYPE_ONLY_SOP = 0,
32 	RQ_ENET_TYPE_NOT_SOP = 1,
33 	RQ_ENET_TYPE_RESV2 = 2,
34 	RQ_ENET_TYPE_RESV3 = 3,
35 };
36 
37 #define RQ_ENET_ADDR_BITS		64
38 #define RQ_ENET_LEN_BITS		14
39 #define RQ_ENET_LEN_MASK		((1 << RQ_ENET_LEN_BITS) - 1)
40 #define RQ_ENET_TYPE_BITS		2
41 #define RQ_ENET_TYPE_MASK		((1 << RQ_ENET_TYPE_BITS) - 1)
42 
43 static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
44 	u64 address, u8 type, u16 length)
45 {
46 	desc->address = cpu_to_le64(address);
47 	desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
48 		((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
49 }
50 
51 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
52 	u64 *address, u8 *type, u16 *length)
53 {
54 	*address = le64_to_cpu(desc->address);
55 	*length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
56 	*type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
57 		RQ_ENET_TYPE_MASK);
58 }
59 
60 #endif /* _RQ_ENET_DESC_H_ */
61