1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
5 */
6
7#ifndef _WQ_ENET_DESC_H_
8#define _WQ_ENET_DESC_H_
9
10/* Ethernet work queue descriptor: 16B */
11struct wq_enet_desc {
12	__le64 address;
13	__le16 length;
14	__le16 mss_loopback;
15	__le16 header_length_flags;
16	__le16 vlan_tag;
17};
18
19#define WQ_ENET_ADDR_BITS		64
20#define WQ_ENET_LEN_BITS		14
21#define WQ_ENET_LEN_MASK		((1 << WQ_ENET_LEN_BITS) - 1)
22#define WQ_ENET_MSS_BITS		14
23#define WQ_ENET_MSS_MASK		((1 << WQ_ENET_MSS_BITS) - 1)
24#define WQ_ENET_MSS_SHIFT		2
25#define WQ_ENET_LOOPBACK_SHIFT		1
26#define WQ_ENET_HDRLEN_BITS		10
27#define WQ_ENET_HDRLEN_MASK		((1 << WQ_ENET_HDRLEN_BITS) - 1)
28#define WQ_ENET_FLAGS_OM_BITS		2
29#define WQ_ENET_FLAGS_OM_MASK		((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
30#define WQ_ENET_FLAGS_EOP_SHIFT		12
31#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT	13
32#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT	14
33#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT	15
34
35#define WQ_ENET_OFFLOAD_MODE_CSUM	0
36#define WQ_ENET_OFFLOAD_MODE_RESERVED	1
37#define WQ_ENET_OFFLOAD_MODE_CSUM_L4	2
38#define WQ_ENET_OFFLOAD_MODE_TSO	3
39
40static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
41	u64 address, u16 length, u16 mss, u16 header_length,
42	u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
43	u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
44{
45	desc->address = cpu_to_le64(address);
46	desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
47	desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
48		WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
49	desc->header_length_flags = cpu_to_le16(
50		(header_length & WQ_ENET_HDRLEN_MASK) |
51		(offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
52		(eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
53		(cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
54		(fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
55		(vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
56	desc->vlan_tag = cpu_to_le16(vlan_tag);
57}
58
59static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
60	u64 *address, u16 *length, u16 *mss, u16 *header_length,
61	u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
62	u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
63{
64	*address = le64_to_cpu(desc->address);
65	*length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
66	*mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
67		WQ_ENET_MSS_MASK;
68	*loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
69		WQ_ENET_LOOPBACK_SHIFT) & 1);
70	*header_length = le16_to_cpu(desc->header_length_flags) &
71		WQ_ENET_HDRLEN_MASK;
72	*offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
73		WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
74	*eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
75		WQ_ENET_FLAGS_EOP_SHIFT) & 1);
76	*cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
77		WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
78	*fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
79		WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
80	*vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
81		WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
82	*vlan_tag = le16_to_cpu(desc->vlan_tag);
83}
84
85#endif /* _WQ_ENET_DESC_H_ */
86