LXR linux/drivers/scsi/snic/wq_enet

   1/*
   2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3 *
   4 * This program is free software; you may redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; version 2 of the License.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15 * SOFTWARE.
  16 */
  17
  18#ifndef _WQ_ENET_DESC_H_
  19#define _WQ_ENET_DESC_H_
  20
  21/* Ethernet work queue descriptor: 16B */
  22struct wq_enet_desc {
  23        __le64 address;
  24        __le16 length;
  25        __le16 mss_loopback;
  26        __le16 header_length_flags;
  27        __le16 vlan_tag;
  28};
  29
  30#define WQ_ENET_ADDR_BITS               64
  31#define WQ_ENET_LEN_BITS                14
  32#define WQ_ENET_LEN_MASK                ((1 << WQ_ENET_LEN_BITS) - 1)
  33#define WQ_ENET_MSS_BITS                14
  34#define WQ_ENET_MSS_MASK                ((1 << WQ_ENET_MSS_BITS) - 1)
  35#define WQ_ENET_MSS_SHIFT               2
  36#define WQ_ENET_LOOPBACK_SHIFT          1
  37#define WQ_ENET_HDRLEN_BITS             10
  38#define WQ_ENET_HDRLEN_MASK             ((1 << WQ_ENET_HDRLEN_BITS) - 1)
  39#define WQ_ENET_FLAGS_OM_BITS           2
  40#define WQ_ENET_FLAGS_OM_MASK           ((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
  41#define WQ_ENET_FLAGS_EOP_SHIFT         12
  42#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT    13
  43#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT  14
  44#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT     15
  45
  46#define WQ_ENET_OFFLOAD_MODE_CSUM       0
  47#define WQ_ENET_OFFLOAD_MODE_RESERVED   1
  48#define WQ_ENET_OFFLOAD_MODE_CSUM_L4    2
  49#define WQ_ENET_OFFLOAD_MODE_TSO        3
  50
  51static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
  52        u64 address, u16 length, u16 mss, u16 header_length,
  53        u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
  54        u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
  55{
  56        desc->address = cpu_to_le64(address);
  57        desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
  58        desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
  59                WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
  60        desc->header_length_flags = cpu_to_le16(
  61                (header_length & WQ_ENET_HDRLEN_MASK) |
  62                (offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
  63                (eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
  64                (cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
  65                (fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
  66                (vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
  67        desc->vlan_tag = cpu_to_le16(vlan_tag);
  68}
  69
  70static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
  71        u64 *address, u16 *length, u16 *mss, u16 *header_length,
  72        u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
  73        u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
  74{
  75        *address = le64_to_cpu(desc->address);
  76        *length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
  77        *mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
  78                WQ_ENET_MSS_MASK;
  79        *loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
  80                WQ_ENET_LOOPBACK_SHIFT) & 1);
  81        *header_length = le16_to_cpu(desc->header_length_flags) &
  82                WQ_ENET_HDRLEN_MASK;
  83        *offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
  84                WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
  85        *eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
  86                WQ_ENET_FLAGS_EOP_SHIFT) & 1);
  87        *cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
  88                WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
  89        *fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
  90                WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
  91        *vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
  92                WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
  93        *vlan_tag = le16_to_cpu(desc->vlan_tag);
  94}
  95
  96#endif /* _WQ_ENET_DESC_H_ */
  97