1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (c) 2019 Broadcom 4 */ 5 6 #include <asm/unaligned.h> 7 #include <linux/string.h> 8 #include <linux/bug.h> 9 10 #include "xtlv.h" 11 12 static int brcmf_xtlv_header_size(u16 opts) 13 { 14 int len = (int)offsetof(struct brcmf_xtlv, data); 15 16 if (opts & BRCMF_XTLV_OPTION_IDU8) 17 --len; 18 if (opts & BRCMF_XTLV_OPTION_LENU8) 19 --len; 20 21 return len; 22 } 23 24 int brcmf_xtlv_data_size(int dlen, u16 opts) 25 { 26 int hsz; 27 28 hsz = brcmf_xtlv_header_size(opts); 29 if (opts & BRCMF_XTLV_OPTION_ALIGN32) 30 return roundup(dlen + hsz, 4); 31 32 return dlen + hsz; 33 } 34 35 void brcmf_xtlv_pack_header(struct brcmf_xtlv *xtlv, u16 id, u16 len, 36 const u8 *data, u16 opts) 37 { 38 u8 *data_buf; 39 u16 mask = BRCMF_XTLV_OPTION_IDU8 | BRCMF_XTLV_OPTION_LENU8; 40 41 if (!(opts & mask)) { 42 u8 *idp = (u8 *)xtlv; 43 u8 *lenp = idp + sizeof(xtlv->id); 44 45 put_unaligned_le16(id, idp); 46 put_unaligned_le16(len, lenp); 47 data_buf = lenp + sizeof(u16); 48 } else if ((opts & mask) == mask) { /* u8 id and u8 len */ 49 u8 *idp = (u8 *)xtlv; 50 u8 *lenp = idp + 1; 51 52 *idp = (u8)id; 53 *lenp = (u8)len; 54 data_buf = lenp + sizeof(u8); 55 } else if (opts & BRCMF_XTLV_OPTION_IDU8) { /* u8 id, u16 len */ 56 u8 *idp = (u8 *)xtlv; 57 u8 *lenp = idp + 1; 58 59 *idp = (u8)id; 60 put_unaligned_le16(len, lenp); 61 data_buf = lenp + sizeof(u16); 62 } else if (opts & BRCMF_XTLV_OPTION_LENU8) { /* u16 id, u8 len */ 63 u8 *idp = (u8 *)xtlv; 64 u8 *lenp = idp + sizeof(u16); 65 66 put_unaligned_le16(id, idp); 67 *lenp = (u8)len; 68 data_buf = lenp + sizeof(u8); 69 } else { 70 WARN(true, "Unexpected xtlv option"); 71 return; 72 } 73 74 if (opts & BRCMF_XTLV_OPTION_LENU8) { 75 WARN_ON(len > 0x00ff); 76 len &= 0xff; 77 } 78 79 if (data) 80 memcpy(data_buf, data, len); 81 } 82 83