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iwlwifi: add iwl_tlv_array_len()

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Allows to easily calculate array length at the end of a TLV.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Shahar S Matityahu 2019-07-22 12:40:51 +03:00 committed by Luca Coelho
parent 94b952b55c
commit a29f6576c3
1 changed files with 15 additions and 0 deletions
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15
drivers/net/wireless/intel/iwlwifi/fw/file.h
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@ -972,4 +972,19 @@ struct iwl_fw_cmd_version {
u8 notif_ver;
} __packed;
static inline size_t _iwl_tlv_array_len(const struct iwl_ucode_tlv *tlv,
size_t fixed_size, size_t var_size)
{
size_t var_len = le32_to_cpu(tlv->length) - fixed_size;
if (WARN_ON(var_len % var_size))
return 0;
return var_len / var_size;
}
#define iwl_tlv_array_len(_tlv_ptr, _struct_ptr, _memb) \
_iwl_tlv_array_len((_tlv_ptr), sizeof(*(_struct_ptr)), \
sizeof(_struct_ptr->_memb[0]))
#endif /* __iwl_fw_file_h__ */