drivers/net/enic/wq_enet_desc.h

   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 */
  24 struct 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
  53 static 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
  72 static 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_ */