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82 lines
1.7 KiB
82 lines
1.7 KiB
// SPDX-License-Identifier: ISC |
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/* |
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* Copyright (c) 2019 Broadcom |
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*/ |
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#include <asm/unaligned.h> |
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#include <linux/string.h> |
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#include <linux/bug.h> |
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#include "xtlv.h" |
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static int brcmf_xtlv_header_size(u16 opts) |
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{ |
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int len = (int)offsetof(struct brcmf_xtlv, data); |
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if (opts & BRCMF_XTLV_OPTION_IDU8) |
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--len; |
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if (opts & BRCMF_XTLV_OPTION_LENU8) |
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--len; |
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return len; |
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} |
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int brcmf_xtlv_data_size(int dlen, u16 opts) |
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{ |
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int hsz; |
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hsz = brcmf_xtlv_header_size(opts); |
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if (opts & BRCMF_XTLV_OPTION_ALIGN32) |
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return roundup(dlen + hsz, 4); |
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return dlen + hsz; |
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} |
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void brcmf_xtlv_pack_header(struct brcmf_xtlv *xtlv, u16 id, u16 len, |
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const u8 *data, u16 opts) |
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{ |
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u8 *data_buf; |
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u16 mask = BRCMF_XTLV_OPTION_IDU8 | BRCMF_XTLV_OPTION_LENU8; |
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if (!(opts & mask)) { |
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u8 *idp = (u8 *)xtlv; |
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u8 *lenp = idp + sizeof(xtlv->id); |
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put_unaligned_le16(id, idp); |
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put_unaligned_le16(len, lenp); |
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data_buf = lenp + sizeof(u16); |
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} else if ((opts & mask) == mask) { /* u8 id and u8 len */ |
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u8 *idp = (u8 *)xtlv; |
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u8 *lenp = idp + 1; |
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*idp = (u8)id; |
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*lenp = (u8)len; |
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data_buf = lenp + sizeof(u8); |
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} else if (opts & BRCMF_XTLV_OPTION_IDU8) { /* u8 id, u16 len */ |
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u8 *idp = (u8 *)xtlv; |
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u8 *lenp = idp + 1; |
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*idp = (u8)id; |
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put_unaligned_le16(len, lenp); |
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data_buf = lenp + sizeof(u16); |
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} else if (opts & BRCMF_XTLV_OPTION_LENU8) { /* u16 id, u8 len */ |
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u8 *idp = (u8 *)xtlv; |
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u8 *lenp = idp + sizeof(u16); |
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put_unaligned_le16(id, idp); |
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*lenp = (u8)len; |
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data_buf = lenp + sizeof(u8); |
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} else { |
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WARN(true, "Unexpected xtlv option"); |
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return; |
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} |
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if (opts & BRCMF_XTLV_OPTION_LENU8) { |
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WARN_ON(len > 0x00ff); |
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len &= 0xff; |
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} |
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if (data) |
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memcpy(data_buf, data, len); |
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} |
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