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 _WQ_ENET_DESC_H_
21 #define _WQ_ENET_DESC_H_
22
23 /* Ethernet work queue descriptor: 16B */
24 struct wq_enet_desc {
25 __le64 address;
26 __le16 length;
27 __le16 mss_loopback;
28 __le16 header_length_flags;
29 __le16 vlan_tag;
30 };
31
32 #define WQ_ENET_ADDR_BITS 64
33 #define WQ_ENET_LEN_BITS 14
34 #define WQ_ENET_LEN_MASK ((1 << WQ_ENET_LEN_BITS) - 1)
35 #define WQ_ENET_MSS_BITS 14
36 #define WQ_ENET_MSS_MASK ((1 << WQ_ENET_MSS_BITS) - 1)
37 #define WQ_ENET_MSS_SHIFT 2
38 #define WQ_ENET_LOOPBACK_SHIFT 1
39 #define WQ_ENET_HDRLEN_BITS 10
40 #define WQ_ENET_HDRLEN_MASK ((1 << WQ_ENET_HDRLEN_BITS) - 1)
41 #define WQ_ENET_FLAGS_OM_BITS 2
42 #define WQ_ENET_FLAGS_OM_MASK ((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
43 #define WQ_ENET_FLAGS_EOP_SHIFT 12
44 #define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT 13
45 #define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT 14
46 #define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT 15
47
48 #define WQ_ENET_OFFLOAD_MODE_CSUM 0
49 #define WQ_ENET_OFFLOAD_MODE_RESERVED 1
50 #define WQ_ENET_OFFLOAD_MODE_CSUM_L4 2
51 #define WQ_ENET_OFFLOAD_MODE_TSO 3
52
53 static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
54 u64 address, u16 length, u16 mss, u16 header_length,
55 u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
56 u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
57 {
58 desc->address = cpu_to_le64(address);
59 desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
60 desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
61 WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
62 desc->header_length_flags = cpu_to_le16(
63 (header_length & WQ_ENET_HDRLEN_MASK) |
64 (offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
65 (eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
66 (cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
67 (fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
68 (vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
69 desc->vlan_tag = cpu_to_le16(vlan_tag);
70 }
71
72 static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
73 u64 *address, u16 *length, u16 *mss, u16 *header_length,
74 u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
75 u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
76 {
77 *address = le64_to_cpu(desc->address);
78 *length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
79 *mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
80 WQ_ENET_MSS_MASK;
81 *loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
82 WQ_ENET_LOOPBACK_SHIFT) & 1);
83 *header_length = le16_to_cpu(desc->header_length_flags) &
84 WQ_ENET_HDRLEN_MASK;
85 *offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
86 WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
87 *eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
88 WQ_ENET_FLAGS_EOP_SHIFT) & 1);
89 *cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
90 WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
91 *fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
92 WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
93 *vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
94 WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
95 *vlan_tag = le16_to_cpu(desc->vlan_tag);
96 }
97
98 #endif /* _WQ_ENET_DESC_H_ */
99
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