1/*
2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#ifndef _WQ_ENET_DESC_H_
19#define _WQ_ENET_DESC_H_
20
21/* Ethernet work queue descriptor: 16B */
22struct wq_enet_desc {
23	__le64 address;
24	__le16 length;
25	__le16 mss_loopback;
26	__le16 header_length_flags;
27	__le16 vlan_tag;
28};
29
30#define WQ_ENET_ADDR_BITS		64
31#define WQ_ENET_LEN_BITS		14
32#define WQ_ENET_LEN_MASK		((1 << WQ_ENET_LEN_BITS) - 1)
33#define WQ_ENET_MSS_BITS		14
34#define WQ_ENET_MSS_MASK		((1 << WQ_ENET_MSS_BITS) - 1)
35#define WQ_ENET_MSS_SHIFT		2
36#define WQ_ENET_LOOPBACK_SHIFT		1
37#define WQ_ENET_HDRLEN_BITS		10
38#define WQ_ENET_HDRLEN_MASK		((1 << WQ_ENET_HDRLEN_BITS) - 1)
39#define WQ_ENET_FLAGS_OM_BITS		2
40#define WQ_ENET_FLAGS_OM_MASK		((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
41#define WQ_ENET_FLAGS_EOP_SHIFT		12
42#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT	13
43#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT	14
44#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT	15
45
46#define WQ_ENET_OFFLOAD_MODE_CSUM	0
47#define WQ_ENET_OFFLOAD_MODE_RESERVED	1
48#define WQ_ENET_OFFLOAD_MODE_CSUM_L4	2
49#define WQ_ENET_OFFLOAD_MODE_TSO	3
50
51static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
52	u64 address, u16 length, u16 mss, u16 header_length,
53	u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
54	u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
55{
56	desc->address = cpu_to_le64(address);
57	desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
58	desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
59		WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
60	desc->header_length_flags = cpu_to_le16(
61		(header_length & WQ_ENET_HDRLEN_MASK) |
62		(offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
63		(eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
64		(cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
65		(fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
66		(vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
67	desc->vlan_tag = cpu_to_le16(vlan_tag);
68}
69
70static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
71	u64 *address, u16 *length, u16 *mss, u16 *header_length,
72	u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
73	u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
74{
75	*address = le64_to_cpu(desc->address);
76	*length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
77	*mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
78		WQ_ENET_MSS_MASK;
79	*loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
80		WQ_ENET_LOOPBACK_SHIFT) & 1);
81	*header_length = le16_to_cpu(desc->header_length_flags) &
82		WQ_ENET_HDRLEN_MASK;
83	*offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
84		WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
85	*eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
86		WQ_ENET_FLAGS_EOP_SHIFT) & 1);
87	*cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
88		WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
89	*fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
90		WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
91	*vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
92		WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
93	*vlan_tag = le16_to_cpu(desc->vlan_tag);
94}
95
96#endif /* _WQ_ENET_DESC_H_ */
97