LXR linux/drivers/net/ethernet/cisco/enic/wq_enet

   1/*
   2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4 *
   5 * This program is free software; you may redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; version 2 of the License.
   8 *
   9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16 * SOFTWARE.
  17 *
  18 */
  19
  20#ifndef _WQ_ENET_DESC_H_
  21#define _WQ_ENET_DESC_H_
  22
  23/* Ethernet work queue descriptor: 16B */
  24struct wq_enet_desc {
  25        __le64 address;
  26        __le16 length;
  27        __le16 mss_loopback;
  28        __le16 header_length_flags;
  29        __le16 vlan_tag;
  30};
  31
  32#define WQ_ENET_ADDR_BITS               64
  33#define WQ_ENET_LEN_BITS                14
  34#define WQ_ENET_LEN_MASK                ((1 << WQ_ENET_LEN_BITS) - 1)
  35#define WQ_ENET_MSS_BITS                14
  36#define WQ_ENET_MSS_MASK                ((1 << WQ_ENET_MSS_BITS) - 1)
  37#define WQ_ENET_MSS_SHIFT               2
  38#define WQ_ENET_LOOPBACK_SHIFT          1
  39#define WQ_ENET_HDRLEN_BITS             10
  40#define WQ_ENET_HDRLEN_MASK             ((1 << WQ_ENET_HDRLEN_BITS) - 1)
  41#define WQ_ENET_FLAGS_OM_BITS           2
  42#define WQ_ENET_FLAGS_OM_MASK           ((1 << WQ_ENET_FLAGS_OM_BITS) - 1)
  43#define WQ_ENET_FLAGS_EOP_SHIFT         12
  44#define WQ_ENET_FLAGS_CQ_ENTRY_SHIFT    13
  45#define WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT  14
  46#define WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT     15
  47
  48#define WQ_ENET_OFFLOAD_MODE_CSUM       0
  49#define WQ_ENET_OFFLOAD_MODE_RESERVED   1
  50#define WQ_ENET_OFFLOAD_MODE_CSUM_L4    2
  51#define WQ_ENET_OFFLOAD_MODE_TSO        3
  52
  53static inline void wq_enet_desc_enc(struct wq_enet_desc *desc,
  54        u64 address, u16 length, u16 mss, u16 header_length,
  55        u8 offload_mode, u8 eop, u8 cq_entry, u8 fcoe_encap,
  56        u8 vlan_tag_insert, u16 vlan_tag, u8 loopback)
  57{
  58        desc->address = cpu_to_le64(address);
  59        desc->length = cpu_to_le16(length & WQ_ENET_LEN_MASK);
  60        desc->mss_loopback = cpu_to_le16((mss & WQ_ENET_MSS_MASK) <<
  61                WQ_ENET_MSS_SHIFT | (loopback & 1) << WQ_ENET_LOOPBACK_SHIFT);
  62        desc->header_length_flags = cpu_to_le16(
  63                (header_length & WQ_ENET_HDRLEN_MASK) |
  64                (offload_mode & WQ_ENET_FLAGS_OM_MASK) << WQ_ENET_HDRLEN_BITS |
  65                (eop & 1) << WQ_ENET_FLAGS_EOP_SHIFT |
  66                (cq_entry & 1) << WQ_ENET_FLAGS_CQ_ENTRY_SHIFT |
  67                (fcoe_encap & 1) << WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT |
  68                (vlan_tag_insert & 1) << WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT);
  69        desc->vlan_tag = cpu_to_le16(vlan_tag);
  70}
  71
  72static inline void wq_enet_desc_dec(struct wq_enet_desc *desc,
  73        u64 *address, u16 *length, u16 *mss, u16 *header_length,
  74        u8 *offload_mode, u8 *eop, u8 *cq_entry, u8 *fcoe_encap,
  75        u8 *vlan_tag_insert, u16 *vlan_tag, u8 *loopback)
  76{
  77        *address = le64_to_cpu(desc->address);
  78        *length = le16_to_cpu(desc->length) & WQ_ENET_LEN_MASK;
  79        *mss = (le16_to_cpu(desc->mss_loopback) >> WQ_ENET_MSS_SHIFT) &
  80                WQ_ENET_MSS_MASK;
  81        *loopback = (u8)((le16_to_cpu(desc->mss_loopback) >>
  82                WQ_ENET_LOOPBACK_SHIFT) & 1);
  83        *header_length = le16_to_cpu(desc->header_length_flags) &
  84                WQ_ENET_HDRLEN_MASK;
  85        *offload_mode = (u8)((le16_to_cpu(desc->header_length_flags) >>
  86                WQ_ENET_HDRLEN_BITS) & WQ_ENET_FLAGS_OM_MASK);
  87        *eop = (u8)((le16_to_cpu(desc->header_length_flags) >>
  88                WQ_ENET_FLAGS_EOP_SHIFT) & 1);
  89        *cq_entry = (u8)((le16_to_cpu(desc->header_length_flags) >>
  90                WQ_ENET_FLAGS_CQ_ENTRY_SHIFT) & 1);
  91        *fcoe_encap = (u8)((le16_to_cpu(desc->header_length_flags) >>
  92                WQ_ENET_FLAGS_FCOE_ENCAP_SHIFT) & 1);
  93        *vlan_tag_insert = (u8)((le16_to_cpu(desc->header_length_flags) >>
  94                WQ_ENET_FLAGS_VLAN_TAG_INSERT_SHIFT) & 1);
  95        *vlan_tag = le16_to_cpu(desc->vlan_tag);
  96}
  97
  98#endif /* _WQ_ENET_DESC_H_ */
  99