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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * drivers/net/ethernet/rocker/rocker_tlv.h - Rocker switch device driver4 * Copyright (c) 2014-2016 Jiri Pirko <jiri@mellanox.com>5 * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>6 */7 8#ifndef _ROCKER_TLV_H9#define _ROCKER_TLV_H10 11#include <linux/types.h>12 13#include "rocker_hw.h"14#include "rocker.h"15 16#define ROCKER_TLV_ALIGNTO 8U17#define ROCKER_TLV_ALIGN(len) \18 (((len) + ROCKER_TLV_ALIGNTO - 1) & ~(ROCKER_TLV_ALIGNTO - 1))19#define ROCKER_TLV_HDRLEN ROCKER_TLV_ALIGN(sizeof(struct rocker_tlv))20 21/* <------- ROCKER_TLV_HDRLEN -------> <--- ROCKER_TLV_ALIGN(payload) --->22 * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+23 * | Header | Pad | Payload | Pad |24 * | (struct rocker_tlv) | ing | | ing |25 * +-----------------------------+- - -+- - - - - - - - - - - - - - -+- - -+26 * <--------------------------- tlv->len -------------------------->27 */28 29static inline struct rocker_tlv *rocker_tlv_next(const struct rocker_tlv *tlv,30 int *remaining)31{32 int totlen = ROCKER_TLV_ALIGN(tlv->len);33 34 *remaining -= totlen;35 return (struct rocker_tlv *) ((char *) tlv + totlen);36}37 38static inline int rocker_tlv_ok(const struct rocker_tlv *tlv, int remaining)39{40 return remaining >= (int) ROCKER_TLV_HDRLEN &&41 tlv->len >= ROCKER_TLV_HDRLEN &&42 tlv->len <= remaining;43}44 45#define rocker_tlv_for_each(pos, head, len, rem) \46 for (pos = head, rem = len; \47 rocker_tlv_ok(pos, rem); \48 pos = rocker_tlv_next(pos, &(rem)))49 50#define rocker_tlv_for_each_nested(pos, tlv, rem) \51 rocker_tlv_for_each(pos, rocker_tlv_data(tlv), \52 rocker_tlv_len(tlv), rem)53 54static inline int rocker_tlv_attr_size(int payload)55{56 return ROCKER_TLV_HDRLEN + payload;57}58 59static inline int rocker_tlv_total_size(int payload)60{61 return ROCKER_TLV_ALIGN(rocker_tlv_attr_size(payload));62}63 64static inline int rocker_tlv_padlen(int payload)65{66 return rocker_tlv_total_size(payload) - rocker_tlv_attr_size(payload);67}68 69static inline int rocker_tlv_type(const struct rocker_tlv *tlv)70{71 return tlv->type;72}73 74static inline void *rocker_tlv_data(const struct rocker_tlv *tlv)75{76 return (char *) tlv + ROCKER_TLV_HDRLEN;77}78 79static inline int rocker_tlv_len(const struct rocker_tlv *tlv)80{81 return tlv->len - ROCKER_TLV_HDRLEN;82}83 84static inline u8 rocker_tlv_get_u8(const struct rocker_tlv *tlv)85{86 return *(u8 *) rocker_tlv_data(tlv);87}88 89static inline u16 rocker_tlv_get_u16(const struct rocker_tlv *tlv)90{91 return *(u16 *) rocker_tlv_data(tlv);92}93 94static inline __be16 rocker_tlv_get_be16(const struct rocker_tlv *tlv)95{96 return *(__be16 *) rocker_tlv_data(tlv);97}98 99static inline u32 rocker_tlv_get_u32(const struct rocker_tlv *tlv)100{101 return *(u32 *) rocker_tlv_data(tlv);102}103 104static inline u64 rocker_tlv_get_u64(const struct rocker_tlv *tlv)105{106 return *(u64 *) rocker_tlv_data(tlv);107}108 109void rocker_tlv_parse(const struct rocker_tlv **tb, int maxtype,110 const char *buf, int buf_len);111 112static inline void rocker_tlv_parse_nested(const struct rocker_tlv **tb,113 int maxtype,114 const struct rocker_tlv *tlv)115{116 rocker_tlv_parse(tb, maxtype, rocker_tlv_data(tlv),117 rocker_tlv_len(tlv));118}119 120static inline void121rocker_tlv_parse_desc(const struct rocker_tlv **tb, int maxtype,122 const struct rocker_desc_info *desc_info)123{124 rocker_tlv_parse(tb, maxtype, desc_info->data,125 desc_info->desc->tlv_size);126}127 128static inline struct rocker_tlv *129rocker_tlv_start(struct rocker_desc_info *desc_info)130{131 return (struct rocker_tlv *) ((char *) desc_info->data +132 desc_info->tlv_size);133}134 135int rocker_tlv_put(struct rocker_desc_info *desc_info,136 int attrtype, int attrlen, const void *data);137 138static inline int139rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value)140{141 u8 tmp = value; /* work around GCC PR81715 */142 143 return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &tmp);144}145 146static inline int147rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value)148{149 u16 tmp = value;150 151 return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &tmp);152}153 154static inline int155rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value)156{157 __be16 tmp = value;158 159 return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &tmp);160}161 162static inline int163rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value)164{165 u32 tmp = value;166 167 return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &tmp);168}169 170static inline int171rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value)172{173 __be32 tmp = value;174 175 return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &tmp);176}177 178static inline int179rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value)180{181 u64 tmp = value;182 183 return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &tmp);184}185 186static inline struct rocker_tlv *187rocker_tlv_nest_start(struct rocker_desc_info *desc_info, int attrtype)188{189 struct rocker_tlv *start = rocker_tlv_start(desc_info);190 191 if (rocker_tlv_put(desc_info, attrtype, 0, NULL) < 0)192 return NULL;193 194 return start;195}196 197static inline void rocker_tlv_nest_end(struct rocker_desc_info *desc_info,198 struct rocker_tlv *start)199{200 start->len = (char *) rocker_tlv_start(desc_info) - (char *) start;201}202 203static inline void rocker_tlv_nest_cancel(struct rocker_desc_info *desc_info,204 const struct rocker_tlv *start)205{206 desc_info->tlv_size = (const char *) start - desc_info->data;207}208 209#endif210