drivers/scsi/snic/wq_enet_desc.h

   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 */
  22 struct 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
  51 static 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
  70 static 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_ */