drivers/net/ethernet/cisco/enic/wq_enet_desc.h

   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 */
  11 struct 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
  40 static 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
  59 static 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_ */