drivers/scsi/snic/wq_enet_desc.h

   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 */
   8 struct 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
  37 static 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
  56 static 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_ */