1 /*
2 * Copyright 2008 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
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