1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
3
4#ifndef _WQ_ENET_DESC_H_
5#define _WQ_ENET_DESC_H_
6
7/* Ethernet work queue descriptor: 16B */
8struct wq_enet_desc {
9	__le64 address;
10	__le16 length;
11	__le16 mss_loopback;
12	__le16 header_length_flags;
13	__le16 vlan_tag;
14};
15
16#define WQ_ENET_ADDR_BITS		64
17#define WQ_ENET_LEN_BITS		14
18#define WQ_ENET_LEN_MASK		((1 << WQ_ENET_LEN_BITS) - 1)
19#define WQ_ENET_MSS_BITS		14
20#define WQ_ENET_MSS_MASK		((1 << WQ_ENET_MSS_BITS) - 1)
21#define WQ_ENET_MSS_SHIFT		2
22#define WQ_ENET_LOOPBACK_SHIFT		1
23#define WQ_ENET_HDRLEN_BITS		10
24#define WQ_ENET_HDRLEN_MASK		((1 << WQ_ENET_HDRLEN_BITS) - 1)
25#define WQ_ENET_FLAGS_OM_BITS		2
26#define WQ_ENET_FLAGS_OM_MASK		((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
27#define WQ_ENET_FLAGS_EOP_SHIFT		12
28#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT	13
29#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT	14
30#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT	15
31
32#define WQ_ENET_OFFLOAD_MODE_CSUM	0
33#define WQ_ENET_OFFLOAD_MODE_RESERVED	1
34#define WQ_ENET_OFFLOAD_MODE_CSUM_L4	2
35#define WQ_ENET_OFFLOAD_MODE_TSO	3
36
37static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
38	u64 address, u16 length, u16 mss, u16 header_length,
39	u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
40	u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
41{
42	desc->address = cpu_to_le64(address);
43	desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
44	desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
45		WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
46	desc->header_length_flags = cpu_to_le16(
47		(header_length & WQ_ENET_HDRLEN_MASK) |
48		(offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
49		(eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
50		(cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
51		(fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
52		(vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
53	desc->vlan_tag = cpu_to_le16(vlan_tag);
54}
55
56static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
57	u64 *address, u16 *length, u16 *mss, u16 *header_length,
58	u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
59	u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
60{
61	*address = le64_to_cpu(desc->address);
62	*length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
63	*mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
64		WQ_ENET_MSS_MASK;
65	*loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
66		WQ_ENET_LOOPBACK_SHIFT) & 1);
67	*header_length = le16_to_cpu(desc->header_length_flags) &
68		WQ_ENET_HDRLEN_MASK;
69	*offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
70		WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
71	*eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
72		WQ_ENET_FLAGS_EOP_SHIFT) & 1);
73	*cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
74		WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
75	*fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
76		WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
77	*vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
78		WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
79	*vlan_tag = le16_to_cpu(desc->vlan_tag);
80}
81
82#endif /* _WQ_ENET_DESC_H_ */
83