Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rq_enet_desc.h
Go to the documentation of this file.
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 #ifndef _RQ_ENET_DESC_H_
19 #define _RQ_ENET_DESC_H_
20 
21 /* Ethernet receive queue descriptor: 16B */
22 struct rq_enet_desc {
25  u8 reserved[6];
26 };
27 
33 };
34 
35 #define RQ_ENET_ADDR_BITS 64
36 #define RQ_ENET_LEN_BITS 14
37 #define RQ_ENET_LEN_MASK ((1 << RQ_ENET_LEN_BITS) - 1)
38 #define RQ_ENET_TYPE_BITS 2
39 #define RQ_ENET_TYPE_MASK ((1 << RQ_ENET_TYPE_BITS) - 1)
40 
41 static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
43 {
44  desc->address = cpu_to_le64(address);
45  desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
46  ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
47 }
48 
49 static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
50  u64 *address, u8 *type, u16 *length)
51 {
52  *address = le64_to_cpu(desc->address);
53  *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
54  *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
56 }
57 
58 #endif /* _RQ_ENET_DESC_H_ */