/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 */
#ifndef _WQ_ENET_DESC_H_
#define _WQ_ENET_DESC_H_

/* Ethernet work queue descriptor: 16B */
struct wq_enet_desc {
        __le64 address;
        __le16 length;
        __le16 mss_loopback;
        __le16 header_length_flags;
        __le16 vlan_tag;
};

#define WQ_ENET_ADDR_BITS               64
#define WQ_ENET_LEN_BITS                14
#define WQ_ENET_LEN_MASK                ((1 << WQ_ENET_LEN_BITS) - 1)
#define WQ_ENET_MSS_BITS                14
#define WQ_ENET_MSS_MASK                ((1 << WQ_ENET_MSS_BITS) - 1)
#define WQ_ENET_MSS_SHIFT               2
#define WQ_ENET_LOOPBACK_SHIFT          1
#define WQ_ENET_HDRLEN_BITS             10
#define WQ_ENET_HDRLEN_MASK             ((1 << WQ_ENET_HDRLEN_BITS) - 1)
#define WQ_ENET_FLAGS_OM_BITS           2
#define WQ_ENET_FLAGS_OM_MASK           ((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
#define WQ_ENET_FLAGS_EOP_SHIFT         12
#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT    13
#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT  14
#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT     15

#define WQ_ENET_OFFLOAD_MODE_CSUM       0
#define WQ_ENET_OFFLOAD_MODE_RESERVED   1
#define WQ_ENET_OFFLOAD_MODE_CSUM_L4    2
#define WQ_ENET_OFFLOAD_MODE_TSO        3

static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
        u64 address, u16 length, u16 mss, u16 header_length,
        u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
        u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
{
        desc->address = cpu_to_le64(address);
        desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
        desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
                WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
        desc->header_length_flags = cpu_to_le16(
                (header_length & WQ_ENET_HDRLEN_MASK) |
                (offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
                (eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
                (cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
                (fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
                (vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
        desc->vlan_tag = cpu_to_le16(vlan_tag);
}

static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
        u64 *address, u16 *length, u16 *mss, u16 *header_length,
        u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
        u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
{
        *address = le64_to_cpu(desc->address);
        *length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
        *mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
                WQ_ENET_MSS_MASK;
        *loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
                WQ_ENET_LOOPBACK_SHIFT) & 1);
        *header_length = le16_to_cpu(desc->header_length_flags) &
                WQ_ENET_HDRLEN_MASK;
        *offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
                WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
        *eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
                WQ_ENET_FLAGS_EOP_SHIFT) & 1);
        *cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
                WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
        *fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
                WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
        *vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
                WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
        *vlan_tag = le16_to_cpu(desc->vlan_tag);
}

#endif /* _WQ_ENET_DESC_H_ */