rq_enet_desc.h

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/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef _RQ_ENET_DESC_H_
#define _RQ_ENET_DESC_H_

/* Ethernet receive queue descriptor: 16B */
struct rq_enet_desc {
    __le64 address;
    __le16 length_type;
    u8 reserved[6];
};

enum rq_enet_type_types {
    RQ_ENET_TYPE_ONLY_SOP = 0,
    RQ_ENET_TYPE_NOT_SOP = 1,
    RQ_ENET_TYPE_RESV2 = 2,
    RQ_ENET_TYPE_RESV3 = 3,
};

#define RQ_ENET_ADDR_BITS       64
#define RQ_ENET_LEN_BITS        14
#define RQ_ENET_LEN_MASK        ((1 << RQ_ENET_LEN_BITS) - 1)
#define RQ_ENET_TYPE_BITS       2
#define RQ_ENET_TYPE_MASK       ((1 << RQ_ENET_TYPE_BITS) - 1)

static inline void rq_enet_desc_enc(struct rq_enet_desc *desc,
    u64 address, u8 type, u16 length)
{
    desc->address = cpu_to_le64(address);
    desc->length_type = cpu_to_le16((length & RQ_ENET_LEN_MASK) |
        ((type & RQ_ENET_TYPE_MASK) << RQ_ENET_LEN_BITS));
}

static inline void rq_enet_desc_dec(struct rq_enet_desc *desc,
    u64 *address, u8 *type, u16 *length)
{
    *address = le64_to_cpu(desc->address);
    *length = le16_to_cpu(desc->length_type) & RQ_ENET_LEN_MASK;
    *type = (u8)((le16_to_cpu(desc->length_type) >> RQ_ENET_LEN_BITS) &
        RQ_ENET_TYPE_MASK);
}

#endif /* _RQ_ENET_DESC_H_ */