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/*
* drivers/net/ethernet/rocker/rocker_tlv.h - Rocker switch device driver
* Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>
* Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef _ROCKER_TLV_H
#define _ROCKER_TLV_H
#include <linux/types.h>
#include "rocker_hw.h"
#include "rocker.h"
#define ROCKER_TLV_ALIGNTO 8U
#define ROCKER_TLV_ALIGN(len) \
(((len) + ROCKER_TLV_ALIGNTO - 1) & ~(ROCKER_TLV_ALIGNTO - 1))
#define ROCKER_TLV_HDRLEN ROCKER_TLV_ALIGN(sizeof(struct rocker_tlv))
/* <------- ROCKER_TLV_HDRLEN -------> <--- ROCKER_TLV_ALIGN(payload) --->
* +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+
* | Header | Pad | Payload | Pad |
* | (struct rocker_tlv) | ing | | ing |
* +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+
* <--------------------------- tlv->len -------------------------->
*/
static inline struct rocker_tlv *rocker_tlv_next(const struct rocker_tlv *tlv,
int *remaining)
{
int totlen = ROCKER_TLV_ALIGN(tlv->len);
*remaining -= totlen;
return (struct rocker_tlv *) ((char *) tlv + totlen);
}
static inline int rocker_tlv_ok(const struct rocker_tlv *tlv, int remaining)
{
return remaining >= (int) ROCKER_TLV_HDRLEN &&
tlv->len >= ROCKER_TLV_HDRLEN &&
tlv->len <= remaining;
}
#define rocker_tlv_for_each(pos, head, len, rem) \
for (pos = head, rem = len; \
rocker_tlv_ok(pos, rem); \
pos = rocker_tlv_next(pos, &(rem)))
#define rocker_tlv_for_each_nested(pos, tlv, rem) \
rocker_tlv_for_each(pos, rocker_tlv_data(tlv), \
rocker_tlv_len(tlv), rem)
static inline int rocker_tlv_attr_size(int payload)
{
return ROCKER_TLV_HDRLEN + payload;
}
static inline int rocker_tlv_total_size(int payload)
{
return ROCKER_TLV_ALIGN(rocker_tlv_attr_size(payload));
}
static inline int rocker_tlv_padlen(int payload)
{
return rocker_tlv_total_size(payload) - rocker_tlv_attr_size(payload);
}
static inline int rocker_tlv_type(const struct rocker_tlv *tlv)
{
return tlv->type;
}
static inline void *rocker_tlv_data(const struct rocker_tlv *tlv)
{
return (char *) tlv + ROCKER_TLV_HDRLEN;
}
static inline int rocker_tlv_len(const struct rocker_tlv *tlv)
{
return tlv->len - ROCKER_TLV_HDRLEN;
}
static inline u8 rocker_tlv_get_u8(const struct rocker_tlv *tlv)
{
return *(u8 *) rocker_tlv_data(tlv);
}
static inline u16 rocker_tlv_get_u16(const struct rocker_tlv *tlv)
{
return *(u16 *) rocker_tlv_data(tlv);
}
static inline __be16 rocker_tlv_get_be16(const struct rocker_tlv *tlv)
{
return *(__be16 *) rocker_tlv_data(tlv);
}
static inline u32 rocker_tlv_get_u32(const struct rocker_tlv *tlv)
{
return *(u32 *) rocker_tlv_data(tlv);
}
static inline u64 rocker_tlv_get_u64(const struct rocker_tlv *tlv)
{
return *(u64 *) rocker_tlv_data(tlv);
}
void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,
const char *buf, int buf_len);
static inline void rocker_tlv_parse_nested(const struct rocker_tlv **tb,
int maxtype,
const struct rocker_tlv *tlv)
{
rocker_tlv_parse(tb, maxtype, rocker_tlv_data(tlv),
rocker_tlv_len(tlv));
}
static inline void
rocker_tlv_parse_desc(const struct rocker_tlv **tb, int maxtype,
const struct rocker_desc_info *desc_info)
{
rocker_tlv_parse(tb, maxtype, desc_info->data,
desc_info->desc->tlv_size);
}
static inline struct rocker_tlv *
rocker_tlv_start(struct rocker_desc_info *desc_info)
{
return (struct rocker_tlv *) ((char *) desc_info->data +
desc_info->tlv_size);
}
int rocker_tlv_put(struct rocker_desc_info *desc_info,
int attrtype, int attrlen, const void *data);
static inline int
rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value)
{
u8 tmp = value; /* work around GCC PR81715 */
return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &tmp);
}
static inline int
rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value)
{
u16 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &tmp);
}
static inline int
rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value)
{
__be16 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &tmp);
}
static inline int
rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value)
{
u32 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &tmp);
}
static inline int
rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value)
{
__be32 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &tmp);
}
static inline int
rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value)
{
u64 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &tmp);
}
static inline struct rocker_tlv *
rocker_tlv_nest_start(struct rocker_desc_info *desc_info, int attrtype)
{
struct rocker_tlv *start = rocker_tlv_start(desc_info);
if (rocker_tlv_put(desc_info, attrtype, 0, NULL) < 0)
return NULL;
return start;
}
static inline void rocker_tlv_nest_end(struct rocker_desc_info *desc_info,
struct rocker_tlv *start)
{
start->len = (char *) rocker_tlv_start(desc_info) - (char *) start;
}
static inline void rocker_tlv_nest_cancel(struct rocker_desc_info *desc_info,
const struct rocker_tlv *start)
{
desc_info->tlv_size = (const char *) start - desc_info->data;
}
#endif
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