diff options
Diffstat (limited to 'drivers/crypto/bcm/spu2.c')
| -rw-r--r-- | drivers/crypto/bcm/spu2.c | 1381 |
1 files changed, 1381 insertions, 0 deletions
diff --git a/drivers/crypto/bcm/spu2.c b/drivers/crypto/bcm/spu2.c new file mode 100644 index 000000000..c860ffb0b --- /dev/null +++ b/drivers/crypto/bcm/spu2.c @@ -0,0 +1,1381 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2016 Broadcom + */ + +/* + * This file works with the SPU2 version of the SPU. SPU2 has different message + * formats than the previous version of the SPU. All SPU message format + * differences should be hidden in the spux.c,h files. + */ + +#include <linux/kernel.h> +#include <linux/string.h> + +#include "util.h" +#include "spu.h" +#include "spu2.h" + +#define SPU2_TX_STATUS_LEN 0 /* SPU2 has no STATUS in input packet */ + +/* + * Controlled by pkt_stat_cnt field in CRYPTO_SS_SPU0_CORE_SPU2_CONTROL0 + * register. Defaults to 2. + */ +#define SPU2_RX_STATUS_LEN 2 + +enum spu2_proto_sel { + SPU2_PROTO_RESV = 0, + SPU2_MACSEC_SECTAG8_ECB = 1, + SPU2_MACSEC_SECTAG8_SCB = 2, + SPU2_MACSEC_SECTAG16 = 3, + SPU2_MACSEC_SECTAG16_8_XPN = 4, + SPU2_IPSEC = 5, + SPU2_IPSEC_ESN = 6, + SPU2_TLS_CIPHER = 7, + SPU2_TLS_AEAD = 8, + SPU2_DTLS_CIPHER = 9, + SPU2_DTLS_AEAD = 10 +}; + +static char *spu2_cipher_type_names[] = { "None", "AES128", "AES192", "AES256", + "DES", "3DES" +}; + +static char *spu2_cipher_mode_names[] = { "ECB", "CBC", "CTR", "CFB", "OFB", + "XTS", "CCM", "GCM" +}; + +static char *spu2_hash_type_names[] = { "None", "AES128", "AES192", "AES256", + "Reserved", "Reserved", "MD5", "SHA1", "SHA224", "SHA256", "SHA384", + "SHA512", "SHA512/224", "SHA512/256", "SHA3-224", "SHA3-256", + "SHA3-384", "SHA3-512" +}; + +static char *spu2_hash_mode_names[] = { "CMAC", "CBC-MAC", "XCBC-MAC", "HMAC", + "Rabin", "CCM", "GCM", "Reserved" +}; + +static char *spu2_ciph_type_name(enum spu2_cipher_type cipher_type) +{ + if (cipher_type >= SPU2_CIPHER_TYPE_LAST) + return "Reserved"; + return spu2_cipher_type_names[cipher_type]; +} + +static char *spu2_ciph_mode_name(enum spu2_cipher_mode cipher_mode) +{ + if (cipher_mode >= SPU2_CIPHER_MODE_LAST) + return "Reserved"; + return spu2_cipher_mode_names[cipher_mode]; +} + +static char *spu2_hash_type_name(enum spu2_hash_type hash_type) +{ + if (hash_type >= SPU2_HASH_TYPE_LAST) + return "Reserved"; + return spu2_hash_type_names[hash_type]; +} + +static char *spu2_hash_mode_name(enum spu2_hash_mode hash_mode) +{ + if (hash_mode >= SPU2_HASH_MODE_LAST) + return "Reserved"; + return spu2_hash_mode_names[hash_mode]; +} + +/* + * Convert from a software cipher mode value to the corresponding value + * for SPU2. + */ +static int spu2_cipher_mode_xlate(enum spu_cipher_mode cipher_mode, + enum spu2_cipher_mode *spu2_mode) +{ + switch (cipher_mode) { + case CIPHER_MODE_ECB: + *spu2_mode = SPU2_CIPHER_MODE_ECB; + break; + case CIPHER_MODE_CBC: + *spu2_mode = SPU2_CIPHER_MODE_CBC; + break; + case CIPHER_MODE_OFB: + *spu2_mode = SPU2_CIPHER_MODE_OFB; + break; + case CIPHER_MODE_CFB: + *spu2_mode = SPU2_CIPHER_MODE_CFB; + break; + case CIPHER_MODE_CTR: + *spu2_mode = SPU2_CIPHER_MODE_CTR; + break; + case CIPHER_MODE_CCM: + *spu2_mode = SPU2_CIPHER_MODE_CCM; + break; + case CIPHER_MODE_GCM: + *spu2_mode = SPU2_CIPHER_MODE_GCM; + break; + case CIPHER_MODE_XTS: + *spu2_mode = SPU2_CIPHER_MODE_XTS; + break; + default: + return -EINVAL; + } + return 0; +} + +/** + * spu2_cipher_xlate() - Convert a cipher {alg/mode/type} triple to a SPU2 + * cipher type and mode. + * @cipher_alg: [in] cipher algorithm value from software enumeration + * @cipher_mode: [in] cipher mode value from software enumeration + * @cipher_type: [in] cipher type value from software enumeration + * @spu2_type: [out] cipher type value used by spu2 hardware + * @spu2_mode: [out] cipher mode value used by spu2 hardware + * + * Return: 0 if successful + */ +static int spu2_cipher_xlate(enum spu_cipher_alg cipher_alg, + enum spu_cipher_mode cipher_mode, + enum spu_cipher_type cipher_type, + enum spu2_cipher_type *spu2_type, + enum spu2_cipher_mode *spu2_mode) +{ + int err; + + err = spu2_cipher_mode_xlate(cipher_mode, spu2_mode); + if (err) { + flow_log("Invalid cipher mode %d\n", cipher_mode); + return err; + } + + switch (cipher_alg) { + case CIPHER_ALG_NONE: + *spu2_type = SPU2_CIPHER_TYPE_NONE; + break; + case CIPHER_ALG_RC4: + /* SPU2 does not support RC4 */ + err = -EINVAL; + *spu2_type = SPU2_CIPHER_TYPE_NONE; + break; + case CIPHER_ALG_DES: + *spu2_type = SPU2_CIPHER_TYPE_DES; + break; + case CIPHER_ALG_3DES: + *spu2_type = SPU2_CIPHER_TYPE_3DES; + break; + case CIPHER_ALG_AES: + switch (cipher_type) { + case CIPHER_TYPE_AES128: + *spu2_type = SPU2_CIPHER_TYPE_AES128; + break; + case CIPHER_TYPE_AES192: + *spu2_type = SPU2_CIPHER_TYPE_AES192; + break; + case CIPHER_TYPE_AES256: + *spu2_type = SPU2_CIPHER_TYPE_AES256; + break; + default: + err = -EINVAL; + } + break; + case CIPHER_ALG_LAST: + default: + err = -EINVAL; + break; + } + + if (err) + flow_log("Invalid cipher alg %d or type %d\n", + cipher_alg, cipher_type); + return err; +} + +/* + * Convert from a software hash mode value to the corresponding value + * for SPU2. Note that HASH_MODE_NONE and HASH_MODE_XCBC have the same value. + */ +static int spu2_hash_mode_xlate(enum hash_mode hash_mode, + enum spu2_hash_mode *spu2_mode) +{ + switch (hash_mode) { + case HASH_MODE_XCBC: + *spu2_mode = SPU2_HASH_MODE_XCBC_MAC; + break; + case HASH_MODE_CMAC: + *spu2_mode = SPU2_HASH_MODE_CMAC; + break; + case HASH_MODE_HMAC: + *spu2_mode = SPU2_HASH_MODE_HMAC; + break; + case HASH_MODE_CCM: + *spu2_mode = SPU2_HASH_MODE_CCM; + break; + case HASH_MODE_GCM: + *spu2_mode = SPU2_HASH_MODE_GCM; + break; + default: + return -EINVAL; + } + return 0; +} + +/** + * spu2_hash_xlate() - Convert a hash {alg/mode/type} triple to a SPU2 hash type + * and mode. + * @hash_alg: [in] hash algorithm value from software enumeration + * @hash_mode: [in] hash mode value from software enumeration + * @hash_type: [in] hash type value from software enumeration + * @ciph_type: [in] cipher type value from software enumeration + * @spu2_type: [out] hash type value used by SPU2 hardware + * @spu2_mode: [out] hash mode value used by SPU2 hardware + * + * Return: 0 if successful + */ +static int +spu2_hash_xlate(enum hash_alg hash_alg, enum hash_mode hash_mode, + enum hash_type hash_type, enum spu_cipher_type ciph_type, + enum spu2_hash_type *spu2_type, enum spu2_hash_mode *spu2_mode) +{ + int err; + + err = spu2_hash_mode_xlate(hash_mode, spu2_mode); + if (err) { + flow_log("Invalid hash mode %d\n", hash_mode); + return err; + } + + switch (hash_alg) { + case HASH_ALG_NONE: + *spu2_type = SPU2_HASH_TYPE_NONE; + break; + case HASH_ALG_MD5: + *spu2_type = SPU2_HASH_TYPE_MD5; + break; + case HASH_ALG_SHA1: + *spu2_type = SPU2_HASH_TYPE_SHA1; + break; + case HASH_ALG_SHA224: + *spu2_type = SPU2_HASH_TYPE_SHA224; + break; + case HASH_ALG_SHA256: + *spu2_type = SPU2_HASH_TYPE_SHA256; + break; + case HASH_ALG_SHA384: + *spu2_type = SPU2_HASH_TYPE_SHA384; + break; + case HASH_ALG_SHA512: + *spu2_type = SPU2_HASH_TYPE_SHA512; + break; + case HASH_ALG_AES: + switch (ciph_type) { + case CIPHER_TYPE_AES128: + *spu2_type = SPU2_HASH_TYPE_AES128; + break; + case CIPHER_TYPE_AES192: + *spu2_type = SPU2_HASH_TYPE_AES192; + break; + case CIPHER_TYPE_AES256: + *spu2_type = SPU2_HASH_TYPE_AES256; + break; + default: + err = -EINVAL; + } + break; + case HASH_ALG_SHA3_224: + *spu2_type = SPU2_HASH_TYPE_SHA3_224; + break; + case HASH_ALG_SHA3_256: + *spu2_type = SPU2_HASH_TYPE_SHA3_256; + break; + case HASH_ALG_SHA3_384: + *spu2_type = SPU2_HASH_TYPE_SHA3_384; + break; + case HASH_ALG_SHA3_512: + *spu2_type = SPU2_HASH_TYPE_SHA3_512; + break; + case HASH_ALG_LAST: + default: + err = -EINVAL; + break; + } + + if (err) + flow_log("Invalid hash alg %d or type %d\n", + hash_alg, hash_type); + return err; +} + +/* Dump FMD ctrl0. The ctrl0 input is in host byte order */ +static void spu2_dump_fmd_ctrl0(u64 ctrl0) +{ + enum spu2_cipher_type ciph_type; + enum spu2_cipher_mode ciph_mode; + enum spu2_hash_type hash_type; + enum spu2_hash_mode hash_mode; + char *ciph_name; + char *ciph_mode_name; + char *hash_name; + char *hash_mode_name; + u8 cfb; + u8 proto; + + packet_log(" FMD CTRL0 %#16llx\n", ctrl0); + if (ctrl0 & SPU2_CIPH_ENCRYPT_EN) + packet_log(" encrypt\n"); + else + packet_log(" decrypt\n"); + + ciph_type = (ctrl0 & SPU2_CIPH_TYPE) >> SPU2_CIPH_TYPE_SHIFT; + ciph_name = spu2_ciph_type_name(ciph_type); + packet_log(" Cipher type: %s\n", ciph_name); + + if (ciph_type != SPU2_CIPHER_TYPE_NONE) { + ciph_mode = (ctrl0 & SPU2_CIPH_MODE) >> SPU2_CIPH_MODE_SHIFT; + ciph_mode_name = spu2_ciph_mode_name(ciph_mode); + packet_log(" Cipher mode: %s\n", ciph_mode_name); + } + + cfb = (ctrl0 & SPU2_CFB_MASK) >> SPU2_CFB_MASK_SHIFT; + packet_log(" CFB %#x\n", cfb); + + proto = (ctrl0 & SPU2_PROTO_SEL) >> SPU2_PROTO_SEL_SHIFT; + packet_log(" protocol %#x\n", proto); + + if (ctrl0 & SPU2_HASH_FIRST) + packet_log(" hash first\n"); + else + packet_log(" cipher first\n"); + + if (ctrl0 & SPU2_CHK_TAG) + packet_log(" check tag\n"); + + hash_type = (ctrl0 & SPU2_HASH_TYPE) >> SPU2_HASH_TYPE_SHIFT; + hash_name = spu2_hash_type_name(hash_type); + packet_log(" Hash type: %s\n", hash_name); + + if (hash_type != SPU2_HASH_TYPE_NONE) { + hash_mode = (ctrl0 & SPU2_HASH_MODE) >> SPU2_HASH_MODE_SHIFT; + hash_mode_name = spu2_hash_mode_name(hash_mode); + packet_log(" Hash mode: %s\n", hash_mode_name); + } + + if (ctrl0 & SPU2_CIPH_PAD_EN) { + packet_log(" Cipher pad: %#2llx\n", + (ctrl0 & SPU2_CIPH_PAD) >> SPU2_CIPH_PAD_SHIFT); + } +} + +/* Dump FMD ctrl1. The ctrl1 input is in host byte order */ +static void spu2_dump_fmd_ctrl1(u64 ctrl1) +{ + u8 hash_key_len; + u8 ciph_key_len; + u8 ret_iv_len; + u8 iv_offset; + u8 iv_len; + u8 hash_tag_len; + u8 ret_md; + + packet_log(" FMD CTRL1 %#16llx\n", ctrl1); + if (ctrl1 & SPU2_TAG_LOC) + packet_log(" Tag after payload\n"); + + packet_log(" Msg includes "); + if (ctrl1 & SPU2_HAS_FR_DATA) + packet_log("FD "); + if (ctrl1 & SPU2_HAS_AAD1) + packet_log("AAD1 "); + if (ctrl1 & SPU2_HAS_NAAD) + packet_log("NAAD "); + if (ctrl1 & SPU2_HAS_AAD2) + packet_log("AAD2 "); + if (ctrl1 & SPU2_HAS_ESN) + packet_log("ESN "); + packet_log("\n"); + + hash_key_len = (ctrl1 & SPU2_HASH_KEY_LEN) >> SPU2_HASH_KEY_LEN_SHIFT; + packet_log(" Hash key len %u\n", hash_key_len); + + ciph_key_len = (ctrl1 & SPU2_CIPH_KEY_LEN) >> SPU2_CIPH_KEY_LEN_SHIFT; + packet_log(" Cipher key len %u\n", ciph_key_len); + + if (ctrl1 & SPU2_GENIV) + packet_log(" Generate IV\n"); + + if (ctrl1 & SPU2_HASH_IV) + packet_log(" IV included in hash\n"); + + if (ctrl1 & SPU2_RET_IV) + packet_log(" Return IV in output before payload\n"); + + ret_iv_len = (ctrl1 & SPU2_RET_IV_LEN) >> SPU2_RET_IV_LEN_SHIFT; + packet_log(" Length of returned IV %u bytes\n", + ret_iv_len ? ret_iv_len : 16); + + iv_offset = (ctrl1 & SPU2_IV_OFFSET) >> SPU2_IV_OFFSET_SHIFT; + packet_log(" IV offset %u\n", iv_offset); + + iv_len = (ctrl1 & SPU2_IV_LEN) >> SPU2_IV_LEN_SHIFT; + packet_log(" Input IV len %u bytes\n", iv_len); + + hash_tag_len = (ctrl1 & SPU2_HASH_TAG_LEN) >> SPU2_HASH_TAG_LEN_SHIFT; + packet_log(" Hash tag length %u bytes\n", hash_tag_len); + + packet_log(" Return "); + ret_md = (ctrl1 & SPU2_RETURN_MD) >> SPU2_RETURN_MD_SHIFT; + if (ret_md) + packet_log("FMD "); + if (ret_md == SPU2_RET_FMD_OMD) + packet_log("OMD "); + else if (ret_md == SPU2_RET_FMD_OMD_IV) + packet_log("OMD IV "); + if (ctrl1 & SPU2_RETURN_FD) + packet_log("FD "); + if (ctrl1 & SPU2_RETURN_AAD1) + packet_log("AAD1 "); + if (ctrl1 & SPU2_RETURN_NAAD) + packet_log("NAAD "); + if (ctrl1 & SPU2_RETURN_AAD2) + packet_log("AAD2 "); + if (ctrl1 & SPU2_RETURN_PAY) + packet_log("Payload"); + packet_log("\n"); +} + +/* Dump FMD ctrl2. The ctrl2 input is in host byte order */ +static void spu2_dump_fmd_ctrl2(u64 ctrl2) +{ + packet_log(" FMD CTRL2 %#16llx\n", ctrl2); + + packet_log(" AAD1 offset %llu length %llu bytes\n", + ctrl2 & SPU2_AAD1_OFFSET, + (ctrl2 & SPU2_AAD1_LEN) >> SPU2_AAD1_LEN_SHIFT); + packet_log(" AAD2 offset %llu\n", + (ctrl2 & SPU2_AAD2_OFFSET) >> SPU2_AAD2_OFFSET_SHIFT); + packet_log(" Payload offset %llu\n", + (ctrl2 & SPU2_PL_OFFSET) >> SPU2_PL_OFFSET_SHIFT); +} + +/* Dump FMD ctrl3. The ctrl3 input is in host byte order */ +static void spu2_dump_fmd_ctrl3(u64 ctrl3) +{ + packet_log(" FMD CTRL3 %#16llx\n", ctrl3); + + packet_log(" Payload length %llu bytes\n", ctrl3 & SPU2_PL_LEN); + packet_log(" TLS length %llu bytes\n", + (ctrl3 & SPU2_TLS_LEN) >> SPU2_TLS_LEN_SHIFT); +} + +static void spu2_dump_fmd(struct SPU2_FMD *fmd) +{ + spu2_dump_fmd_ctrl0(le64_to_cpu(fmd->ctrl0)); + spu2_dump_fmd_ctrl1(le64_to_cpu(fmd->ctrl1)); + spu2_dump_fmd_ctrl2(le64_to_cpu(fmd->ctrl2)); + spu2_dump_fmd_ctrl3(le64_to_cpu(fmd->ctrl3)); +} + +static void spu2_dump_omd(u8 *omd, u16 hash_key_len, u16 ciph_key_len, + u16 hash_iv_len, u16 ciph_iv_len) +{ + u8 *ptr = omd; + + packet_log(" OMD:\n"); + + if (hash_key_len) { + packet_log(" Hash Key Length %u bytes\n", hash_key_len); + packet_dump(" KEY: ", ptr, hash_key_len); + ptr += hash_key_len; + } + + if (ciph_key_len) { + packet_log(" Cipher Key Length %u bytes\n", ciph_key_len); + packet_dump(" KEY: ", ptr, ciph_key_len); + ptr += ciph_key_len; + } + + if (hash_iv_len) { + packet_log(" Hash IV Length %u bytes\n", hash_iv_len); + packet_dump(" hash IV: ", ptr, hash_iv_len); + ptr += ciph_key_len; + } + + if (ciph_iv_len) { + packet_log(" Cipher IV Length %u bytes\n", ciph_iv_len); + packet_dump(" cipher IV: ", ptr, ciph_iv_len); + } +} + +/* Dump a SPU2 header for debug */ +void spu2_dump_msg_hdr(u8 *buf, unsigned int buf_len) +{ + struct SPU2_FMD *fmd = (struct SPU2_FMD *)buf; + u8 *omd; + u64 ctrl1; + u16 hash_key_len; + u16 ciph_key_len; + u16 hash_iv_len; + u16 ciph_iv_len; + u16 omd_len; + + packet_log("\n"); + packet_log("SPU2 message header %p len: %u\n", buf, buf_len); + + spu2_dump_fmd(fmd); + omd = (u8 *)(fmd + 1); + + ctrl1 = le64_to_cpu(fmd->ctrl1); + hash_key_len = (ctrl1 & SPU2_HASH_KEY_LEN) >> SPU2_HASH_KEY_LEN_SHIFT; + ciph_key_len = (ctrl1 & SPU2_CIPH_KEY_LEN) >> SPU2_CIPH_KEY_LEN_SHIFT; + hash_iv_len = 0; + ciph_iv_len = (ctrl1 & SPU2_IV_LEN) >> SPU2_IV_LEN_SHIFT; + spu2_dump_omd(omd, hash_key_len, ciph_key_len, hash_iv_len, + ciph_iv_len); + + /* Double check sanity */ + omd_len = hash_key_len + ciph_key_len + hash_iv_len + ciph_iv_len; + if (FMD_SIZE + omd_len != buf_len) { + packet_log + (" Packet parsed incorrectly. buf_len %u, sum of MD %zu\n", + buf_len, FMD_SIZE + omd_len); + } + packet_log("\n"); +} + +/** + * spu2_fmd_init() - At setkey time, initialize the fixed meta data for + * subsequent skcipher requests for this context. + * @spu2_cipher_type: Cipher algorithm + * @spu2_mode: Cipher mode + * @cipher_key_len: Length of cipher key, in bytes + * @cipher_iv_len: Length of cipher initialization vector, in bytes + * + * Return: 0 (success) + */ +static int spu2_fmd_init(struct SPU2_FMD *fmd, + enum spu2_cipher_type spu2_type, + enum spu2_cipher_mode spu2_mode, + u32 cipher_key_len, u32 cipher_iv_len) +{ + u64 ctrl0; + u64 ctrl1; + u64 ctrl2; + u64 ctrl3; + u32 aad1_offset; + u32 aad2_offset; + u16 aad1_len = 0; + u64 payload_offset; + + ctrl0 = (spu2_type << SPU2_CIPH_TYPE_SHIFT) | + (spu2_mode << SPU2_CIPH_MODE_SHIFT); + + ctrl1 = (cipher_key_len << SPU2_CIPH_KEY_LEN_SHIFT) | + ((u64)cipher_iv_len << SPU2_IV_LEN_SHIFT) | + ((u64)SPU2_RET_FMD_ONLY << SPU2_RETURN_MD_SHIFT) | SPU2_RETURN_PAY; + + /* + * AAD1 offset is from start of FD. FD length is always 0 for this + * driver. So AAD1_offset is always 0. + */ + aad1_offset = 0; + aad2_offset = aad1_offset; + payload_offset = 0; + ctrl2 = aad1_offset | + (aad1_len << SPU2_AAD1_LEN_SHIFT) | + (aad2_offset << SPU2_AAD2_OFFSET_SHIFT) | + (payload_offset << SPU2_PL_OFFSET_SHIFT); + + ctrl3 = 0; + + fmd->ctrl0 = cpu_to_le64(ctrl0); + fmd->ctrl1 = cpu_to_le64(ctrl1); + fmd->ctrl2 = cpu_to_le64(ctrl2); + fmd->ctrl3 = cpu_to_le64(ctrl3); + + return 0; +} + +/** + * spu2_fmd_ctrl0_write() - Write ctrl0 field in fixed metadata (FMD) field of + * SPU request packet. + * @fmd: Start of FMD field to be written + * @is_inbound: true if decrypting. false if encrypting. + * @authFirst: true if alg authenticates before encrypting + * @protocol: protocol selector + * @cipher_type: cipher algorithm + * @cipher_mode: cipher mode + * @auth_type: authentication type + * @auth_mode: authentication mode + */ +static void spu2_fmd_ctrl0_write(struct SPU2_FMD *fmd, + bool is_inbound, bool auth_first, + enum spu2_proto_sel protocol, + enum spu2_cipher_type cipher_type, + enum spu2_cipher_mode cipher_mode, + enum spu2_hash_type auth_type, + enum spu2_hash_mode auth_mode) +{ + u64 ctrl0 = 0; + + if ((cipher_type != SPU2_CIPHER_TYPE_NONE) && !is_inbound) + ctrl0 |= SPU2_CIPH_ENCRYPT_EN; + + ctrl0 |= ((u64)cipher_type << SPU2_CIPH_TYPE_SHIFT) | + ((u64)cipher_mode << SPU2_CIPH_MODE_SHIFT); + + if (protocol) + ctrl0 |= (u64)protocol << SPU2_PROTO_SEL_SHIFT; + + if (auth_first) + ctrl0 |= SPU2_HASH_FIRST; + + if (is_inbound && (auth_type != SPU2_HASH_TYPE_NONE)) + ctrl0 |= SPU2_CHK_TAG; + + ctrl0 |= (((u64)auth_type << SPU2_HASH_TYPE_SHIFT) | + ((u64)auth_mode << SPU2_HASH_MODE_SHIFT)); + + fmd->ctrl0 = cpu_to_le64(ctrl0); +} + +/** + * spu2_fmd_ctrl1_write() - Write ctrl1 field in fixed metadata (FMD) field of + * SPU request packet. + * @fmd: Start of FMD field to be written + * @assoc_size: Length of additional associated data, in bytes + * @auth_key_len: Length of authentication key, in bytes + * @cipher_key_len: Length of cipher key, in bytes + * @gen_iv: If true, hw generates IV and returns in response + * @hash_iv: IV participates in hash. Used for IPSEC and TLS. + * @return_iv: Return IV in output packet before payload + * @ret_iv_len: Length of IV returned from SPU, in bytes + * @ret_iv_offset: Offset into full IV of start of returned IV + * @cipher_iv_len: Length of input cipher IV, in bytes + * @digest_size: Length of digest (aka, hash tag or ICV), in bytes + * @return_payload: Return payload in SPU response + * @return_md : return metadata in SPU response + * + * Packet can have AAD2 w/o AAD1. For algorithms currently supported, + * associated data goes in AAD2. + */ +static void spu2_fmd_ctrl1_write(struct SPU2_FMD *fmd, bool is_inbound, + u64 assoc_size, + u64 auth_key_len, u64 cipher_key_len, + bool gen_iv, bool hash_iv, bool return_iv, + u64 ret_iv_len, u64 ret_iv_offset, + u64 cipher_iv_len, u64 digest_size, + bool return_payload, bool return_md) +{ + u64 ctrl1 = 0; + + if (is_inbound && digest_size) + ctrl1 |= SPU2_TAG_LOC; + + if (assoc_size) { + ctrl1 |= SPU2_HAS_AAD2; + ctrl1 |= SPU2_RETURN_AAD2; /* need aad2 for gcm aes esp */ + } + + if (auth_key_len) + ctrl1 |= ((auth_key_len << SPU2_HASH_KEY_LEN_SHIFT) & + SPU2_HASH_KEY_LEN); + + if (cipher_key_len) + ctrl1 |= ((cipher_key_len << SPU2_CIPH_KEY_LEN_SHIFT) & + SPU2_CIPH_KEY_LEN); + + if (gen_iv) + ctrl1 |= SPU2_GENIV; + + if (hash_iv) + ctrl1 |= SPU2_HASH_IV; + + if (return_iv) { + ctrl1 |= SPU2_RET_IV; + ctrl1 |= ret_iv_len << SPU2_RET_IV_LEN_SHIFT; + ctrl1 |= ret_iv_offset << SPU2_IV_OFFSET_SHIFT; + } + + ctrl1 |= ((cipher_iv_len << SPU2_IV_LEN_SHIFT) & SPU2_IV_LEN); + + if (digest_size) + ctrl1 |= ((digest_size << SPU2_HASH_TAG_LEN_SHIFT) & + SPU2_HASH_TAG_LEN); + + /* Let's ask for the output pkt to include FMD, but don't need to + * get keys and IVs back in OMD. + */ + if (return_md) + ctrl1 |= ((u64)SPU2_RET_FMD_ONLY << SPU2_RETURN_MD_SHIFT); + else + ctrl1 |= ((u64)SPU2_RET_NO_MD << SPU2_RETURN_MD_SHIFT); + + /* Crypto API does not get assoc data back. So no need for AAD2. */ + + if (return_payload) + ctrl1 |= SPU2_RETURN_PAY; + + fmd->ctrl1 = cpu_to_le64(ctrl1); +} + +/** + * spu2_fmd_ctrl2_write() - Set the ctrl2 field in the fixed metadata field of + * SPU2 header. + * @fmd: Start of FMD field to be written + * @cipher_offset: Number of bytes from Start of Packet (end of FD field) where + * data to be encrypted or decrypted begins + * @auth_key_len: Length of authentication key, in bytes + * @auth_iv_len: Length of authentication initialization vector, in bytes + * @cipher_key_len: Length of cipher key, in bytes + * @cipher_iv_len: Length of cipher IV, in bytes + */ +static void spu2_fmd_ctrl2_write(struct SPU2_FMD *fmd, u64 cipher_offset, + u64 auth_key_len, u64 auth_iv_len, + u64 cipher_key_len, u64 cipher_iv_len) +{ + u64 ctrl2; + u64 aad1_offset; + u64 aad2_offset; + u16 aad1_len = 0; + u64 payload_offset; + + /* AAD1 offset is from start of FD. FD length always 0. */ + aad1_offset = 0; + + aad2_offset = aad1_offset; + payload_offset = cipher_offset; + ctrl2 = aad1_offset | + (aad1_len << SPU2_AAD1_LEN_SHIFT) | + (aad2_offset << SPU2_AAD2_OFFSET_SHIFT) | + (payload_offset << SPU2_PL_OFFSET_SHIFT); + + fmd->ctrl2 = cpu_to_le64(ctrl2); +} + +/** + * spu2_fmd_ctrl3_write() - Set the ctrl3 field in FMD + * @fmd: Fixed meta data. First field in SPU2 msg header. + * @payload_len: Length of payload, in bytes + */ +static void spu2_fmd_ctrl3_write(struct SPU2_FMD *fmd, u64 payload_len) +{ + u64 ctrl3; + + ctrl3 = payload_len & SPU2_PL_LEN; + + fmd->ctrl3 = cpu_to_le64(ctrl3); +} + +/** + * spu2_ctx_max_payload() - Determine the maximum length of the payload for a + * SPU message for a given cipher and hash alg context. + * @cipher_alg: The cipher algorithm + * @cipher_mode: The cipher mode + * @blocksize: The size of a block of data for this algo + * + * For SPU2, the hardware generally ignores the PayloadLen field in ctrl3 of + * FMD and just keeps computing until it receives a DMA descriptor with the EOF + * flag set. So we consider the max payload to be infinite. AES CCM is an + * exception. + * + * Return: Max payload length in bytes + */ +u32 spu2_ctx_max_payload(enum spu_cipher_alg cipher_alg, + enum spu_cipher_mode cipher_mode, + unsigned int blocksize) +{ + if ((cipher_alg == CIPHER_ALG_AES) && + (cipher_mode == CIPHER_MODE_CCM)) { + u32 excess = SPU2_MAX_PAYLOAD % blocksize; + + return SPU2_MAX_PAYLOAD - excess; + } else { + return SPU_MAX_PAYLOAD_INF; + } +} + +/** + * spu_payload_length() - Given a SPU2 message header, extract the payload + * length. + * @spu_hdr: Start of SPU message header (FMD) + * + * Return: payload length, in bytes + */ +u32 spu2_payload_length(u8 *spu_hdr) +{ + struct SPU2_FMD *fmd = (struct SPU2_FMD *)spu_hdr; + u32 pl_len; + u64 ctrl3; + + ctrl3 = le64_to_cpu(fmd->ctrl3); + pl_len = ctrl3 & SPU2_PL_LEN; + + return pl_len; +} + +/** + * spu_response_hdr_len() - Determine the expected length of a SPU response + * header. + * @auth_key_len: Length of authentication key, in bytes + * @enc_key_len: Length of encryption key, in bytes + * + * For SPU2, includes just FMD. OMD is never requested. + * + * Return: Length of FMD, in bytes + */ +u16 spu2_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash) +{ + return FMD_SIZE; +} + +/** + * spu_hash_pad_len() - Calculate the length of hash padding required to extend + * data to a full block size. + * @hash_alg: hash algorithm + * @hash_mode: hash mode + * @chunksize: length of data, in bytes + * @hash_block_size: size of a hash block, in bytes + * + * SPU2 hardware does all hash padding + * + * Return: length of hash pad in bytes + */ +u16 spu2_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode, + u32 chunksize, u16 hash_block_size) +{ + return 0; +} + +/** + * spu2_gcm_ccm_padlen() - Determine the length of GCM/CCM padding for either + * the AAD field or the data. + * + * Return: 0. Unlike SPU-M, SPU2 hardware does any GCM/CCM padding required. + */ +u32 spu2_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode, + unsigned int data_size) +{ + return 0; +} + +/** + * spu_assoc_resp_len() - Determine the size of the AAD2 buffer needed to catch + * associated data in a SPU2 output packet. + * @cipher_mode: cipher mode + * @assoc_len: length of additional associated data, in bytes + * @iv_len: length of initialization vector, in bytes + * @is_encrypt: true if encrypting. false if decrypt. + * + * Return: Length of buffer to catch associated data in response + */ +u32 spu2_assoc_resp_len(enum spu_cipher_mode cipher_mode, + unsigned int assoc_len, unsigned int iv_len, + bool is_encrypt) +{ + u32 resp_len = assoc_len; + + if (is_encrypt) + /* gcm aes esp has to write 8-byte IV in response */ + resp_len += iv_len; + return resp_len; +} + +/* + * spu_aead_ivlen() - Calculate the length of the AEAD IV to be included + * in a SPU request after the AAD and before the payload. + * @cipher_mode: cipher mode + * @iv_ctr_len: initialization vector length in bytes + * + * For SPU2, AEAD IV is included in OMD and does not need to be repeated + * prior to the payload. + * + * Return: Length of AEAD IV in bytes + */ +u8 spu2_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len) +{ + return 0; +} + +/** + * spu2_hash_type() - Determine the type of hash operation. + * @src_sent: The number of bytes in the current request that have already + * been sent to the SPU to be hashed. + * + * SPU2 always does a FULL hash operation + */ +enum hash_type spu2_hash_type(u32 src_sent) +{ + return HASH_TYPE_FULL; +} + +/** + * spu2_digest_size() - Determine the size of a hash digest to expect the SPU to + * return. + * alg_digest_size: Number of bytes in the final digest for the given algo + * alg: The hash algorithm + * htype: Type of hash operation (init, update, full, etc) + * + */ +u32 spu2_digest_size(u32 alg_digest_size, enum hash_alg alg, + enum hash_type htype) +{ + return alg_digest_size; +} + +/** + * spu_create_request() - Build a SPU2 request message header, includint FMD and + * OMD. + * @spu_hdr: Start of buffer where SPU request header is to be written + * @req_opts: SPU request message options + * @cipher_parms: Parameters related to cipher algorithm + * @hash_parms: Parameters related to hash algorithm + * @aead_parms: Parameters related to AEAD operation + * @data_size: Length of data to be encrypted or authenticated. If AEAD, does + * not include length of AAD. + * + * Construct the message starting at spu_hdr. Caller should allocate this buffer + * in DMA-able memory at least SPU_HEADER_ALLOC_LEN bytes long. + * + * Return: the length of the SPU header in bytes. 0 if an error occurs. + */ +u32 spu2_create_request(u8 *spu_hdr, + struct spu_request_opts *req_opts, + struct spu_cipher_parms *cipher_parms, + struct spu_hash_parms *hash_parms, + struct spu_aead_parms *aead_parms, + unsigned int data_size) +{ + struct SPU2_FMD *fmd; + u8 *ptr; + unsigned int buf_len; + int err; + enum spu2_cipher_type spu2_ciph_type = SPU2_CIPHER_TYPE_NONE; + enum spu2_cipher_mode spu2_ciph_mode; + enum spu2_hash_type spu2_auth_type = SPU2_HASH_TYPE_NONE; + enum spu2_hash_mode spu2_auth_mode; + bool return_md = true; + enum spu2_proto_sel proto = SPU2_PROTO_RESV; + + /* size of the payload */ + unsigned int payload_len = + hash_parms->prebuf_len + data_size + hash_parms->pad_len - + ((req_opts->is_aead && req_opts->is_inbound) ? + hash_parms->digestsize : 0); + + /* offset of prebuf or data from start of AAD2 */ + unsigned int cipher_offset = aead_parms->assoc_size + + aead_parms->aad_pad_len + aead_parms->iv_len; + +#ifdef DEBUG + /* total size of the data following OMD (without STAT word padding) */ + unsigned int real_db_size = spu_real_db_size(aead_parms->assoc_size, + aead_parms->iv_len, + hash_parms->prebuf_len, + data_size, + aead_parms->aad_pad_len, + aead_parms->data_pad_len, + hash_parms->pad_len); +#endif + unsigned int assoc_size = aead_parms->assoc_size; + + if (req_opts->is_aead && + (cipher_parms->alg == CIPHER_ALG_AES) && + (cipher_parms->mode == CIPHER_MODE_GCM)) + /* + * On SPU 2, aes gcm cipher first on encrypt, auth first on + * decrypt + */ + req_opts->auth_first = req_opts->is_inbound; + + /* and do opposite for ccm (auth 1st on encrypt) */ + if (req_opts->is_aead && + (cipher_parms->alg == CIPHER_ALG_AES) && + (cipher_parms->mode == CIPHER_MODE_CCM)) + req_opts->auth_first = !req_opts->is_inbound; + + flow_log("%s()\n", __func__); + flow_log(" in:%u authFirst:%u\n", + req_opts->is_inbound, req_opts->auth_first); + flow_log(" cipher alg:%u mode:%u type %u\n", cipher_parms->alg, + cipher_parms->mode, cipher_parms->type); + flow_log(" is_esp: %s\n", req_opts->is_esp ? "yes" : "no"); + flow_log(" key: %d\n", cipher_parms->key_len); + flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len); + flow_log(" iv: %d\n", cipher_parms->iv_len); + flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len); + flow_log(" auth alg:%u mode:%u type %u\n", + hash_parms->alg, hash_parms->mode, hash_parms->type); + flow_log(" digestsize: %u\n", hash_parms->digestsize); + flow_log(" authkey: %d\n", hash_parms->key_len); + flow_dump(" authkey: ", hash_parms->key_buf, hash_parms->key_len); + flow_log(" assoc_size:%u\n", assoc_size); + flow_log(" prebuf_len:%u\n", hash_parms->prebuf_len); + flow_log(" data_size:%u\n", data_size); + flow_log(" hash_pad_len:%u\n", hash_parms->pad_len); + flow_log(" real_db_size:%u\n", real_db_size); + flow_log(" cipher_offset:%u payload_len:%u\n", + cipher_offset, payload_len); + flow_log(" aead_iv: %u\n", aead_parms->iv_len); + + /* Convert to spu2 values for cipher alg, hash alg */ + err = spu2_cipher_xlate(cipher_parms->alg, cipher_parms->mode, + cipher_parms->type, + &spu2_ciph_type, &spu2_ciph_mode); + + /* If we are doing GCM hashing only - either via rfc4543 transform + * or because we happen to do GCM with AAD only and no payload - we + * need to configure hardware to use hash key rather than cipher key + * and put data into payload. This is because unlike SPU-M, running + * GCM cipher with 0 size payload is not permitted. + */ + if ((req_opts->is_rfc4543) || + ((spu2_ciph_mode == SPU2_CIPHER_MODE_GCM) && + (payload_len == 0))) { + /* Use hashing (only) and set up hash key */ + spu2_ciph_type = SPU2_CIPHER_TYPE_NONE; + hash_parms->key_len = cipher_parms->key_len; + memcpy(hash_parms->key_buf, cipher_parms->key_buf, + cipher_parms->key_len); + cipher_parms->key_len = 0; + + if (req_opts->is_rfc4543) + payload_len += assoc_size; + else + payload_len = assoc_size; + cipher_offset = 0; + assoc_size = 0; + } + + if (err) + return 0; + + flow_log("spu2 cipher type %s, cipher mode %s\n", + spu2_ciph_type_name(spu2_ciph_type), + spu2_ciph_mode_name(spu2_ciph_mode)); + + err = spu2_hash_xlate(hash_parms->alg, hash_parms->mode, + hash_parms->type, + cipher_parms->type, + &spu2_auth_type, &spu2_auth_mode); + if (err) + return 0; + + flow_log("spu2 hash type %s, hash mode %s\n", + spu2_hash_type_name(spu2_auth_type), + spu2_hash_mode_name(spu2_auth_mode)); + + fmd = (struct SPU2_FMD *)spu_hdr; + + spu2_fmd_ctrl0_write(fmd, req_opts->is_inbound, req_opts->auth_first, + proto, spu2_ciph_type, spu2_ciph_mode, + spu2_auth_type, spu2_auth_mode); + + spu2_fmd_ctrl1_write(fmd, req_opts->is_inbound, assoc_size, + hash_parms->key_len, cipher_parms->key_len, + false, false, + aead_parms->return_iv, aead_parms->ret_iv_len, + aead_parms->ret_iv_off, + cipher_parms->iv_len, hash_parms->digestsize, + !req_opts->bd_suppress, return_md); + + spu2_fmd_ctrl2_write(fmd, cipher_offset, hash_parms->key_len, 0, + cipher_parms->key_len, cipher_parms->iv_len); + + spu2_fmd_ctrl3_write(fmd, payload_len); + + ptr = (u8 *)(fmd + 1); + buf_len = sizeof(struct SPU2_FMD); + + /* Write OMD */ + if (hash_parms->key_len) { + memcpy(ptr, hash_parms->key_buf, hash_parms->key_len); + ptr += hash_parms->key_len; + buf_len += hash_parms->key_len; + } + if (cipher_parms->key_len) { + memcpy(ptr, cipher_parms->key_buf, cipher_parms->key_len); + ptr += cipher_parms->key_len; + buf_len += cipher_parms->key_len; + } + if (cipher_parms->iv_len) { + memcpy(ptr, cipher_parms->iv_buf, cipher_parms->iv_len); + ptr += cipher_parms->iv_len; + buf_len += cipher_parms->iv_len; + } + + packet_dump(" SPU request header: ", spu_hdr, buf_len); + + return buf_len; +} + +/** + * spu_cipher_req_init() - Build an skcipher SPU2 request message header, + * including FMD and OMD. + * @spu_hdr: Location of start of SPU request (FMD field) + * @cipher_parms: Parameters describing cipher request + * + * Called at setkey time to initialize a msg header that can be reused for all + * subsequent skcipher requests. Construct the message starting at spu_hdr. + * Caller should allocate this buffer in DMA-able memory at least + * SPU_HEADER_ALLOC_LEN bytes long. + * + * Return: the total length of the SPU header (FMD and OMD) in bytes. 0 if an + * error occurs. + */ +u16 spu2_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms) +{ + struct SPU2_FMD *fmd; + u8 *omd; + enum spu2_cipher_type spu2_type = SPU2_CIPHER_TYPE_NONE; + enum spu2_cipher_mode spu2_mode; + int err; + + flow_log("%s()\n", __func__); + flow_log(" cipher alg:%u mode:%u type %u\n", cipher_parms->alg, + cipher_parms->mode, cipher_parms->type); + flow_log(" cipher_iv_len: %u\n", cipher_parms->iv_len); + flow_log(" key: %d\n", cipher_parms->key_len); + flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len); + + /* Convert to spu2 values */ + err = spu2_cipher_xlate(cipher_parms->alg, cipher_parms->mode, + cipher_parms->type, &spu2_type, &spu2_mode); + if (err) + return 0; + + flow_log("spu2 cipher type %s, cipher mode %s\n", + spu2_ciph_type_name(spu2_type), + spu2_ciph_mode_name(spu2_mode)); + + /* Construct the FMD header */ + fmd = (struct SPU2_FMD *)spu_hdr; + err = spu2_fmd_init(fmd, spu2_type, spu2_mode, cipher_parms->key_len, + cipher_parms->iv_len); + if (err) + return 0; + + /* Write cipher key to OMD */ + omd = (u8 *)(fmd + 1); + if (cipher_parms->key_buf && cipher_parms->key_len) + memcpy(omd, cipher_parms->key_buf, cipher_parms->key_len); + + packet_dump(" SPU request header: ", spu_hdr, + FMD_SIZE + cipher_parms->key_len + cipher_parms->iv_len); + + return FMD_SIZE + cipher_parms->key_len + cipher_parms->iv_len; +} + +/** + * spu_cipher_req_finish() - Finish building a SPU request message header for a + * block cipher request. + * @spu_hdr: Start of the request message header (MH field) + * @spu_req_hdr_len: Length in bytes of the SPU request header + * @isInbound: 0 encrypt, 1 decrypt + * @cipher_parms: Parameters describing cipher operation to be performed + * @data_size: Length of the data in the BD field + * + * Assumes much of the header was already filled in at setkey() time in + * spu_cipher_req_init(). + * spu_cipher_req_init() fills in the encryption key. + */ +void spu2_cipher_req_finish(u8 *spu_hdr, + u16 spu_req_hdr_len, + unsigned int is_inbound, + struct spu_cipher_parms *cipher_parms, + unsigned int data_size) +{ + struct SPU2_FMD *fmd; + u8 *omd; /* start of optional metadata */ + u64 ctrl0; + u64 ctrl3; + + flow_log("%s()\n", __func__); + flow_log(" in: %u\n", is_inbound); + flow_log(" cipher alg: %u, cipher_type: %u\n", cipher_parms->alg, + cipher_parms->type); + flow_log(" iv len: %d\n", cipher_parms->iv_len); + flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len); + flow_log(" data_size: %u\n", data_size); + + fmd = (struct SPU2_FMD *)spu_hdr; + omd = (u8 *)(fmd + 1); + + /* + * FMD ctrl0 was initialized at setkey time. update it to indicate + * whether we are encrypting or decrypting. + */ + ctrl0 = le64_to_cpu(fmd->ctrl0); + if (is_inbound) + ctrl0 &= ~SPU2_CIPH_ENCRYPT_EN; /* decrypt */ + else + ctrl0 |= SPU2_CIPH_ENCRYPT_EN; /* encrypt */ + fmd->ctrl0 = cpu_to_le64(ctrl0); + + if (cipher_parms->alg && cipher_parms->iv_buf && cipher_parms->iv_len) { + /* cipher iv provided so put it in here */ + memcpy(omd + cipher_parms->key_len, cipher_parms->iv_buf, + cipher_parms->iv_len); + } + + ctrl3 = le64_to_cpu(fmd->ctrl3); + data_size &= SPU2_PL_LEN; + ctrl3 |= data_size; + fmd->ctrl3 = cpu_to_le64(ctrl3); + + packet_dump(" SPU request header: ", spu_hdr, spu_req_hdr_len); +} + +/** + * spu_request_pad() - Create pad bytes at the end of the data. + * @pad_start: Start of buffer where pad bytes are to be written + * @gcm_padding: Length of GCM padding, in bytes + * @hash_pad_len: Number of bytes of padding extend data to full block + * @auth_alg: Authentication algorithm + * @auth_mode: Authentication mode + * @total_sent: Length inserted at end of hash pad + * @status_padding: Number of bytes of padding to align STATUS word + * + * There may be three forms of pad: + * 1. GCM pad - for GCM mode ciphers, pad to 16-byte alignment + * 2. hash pad - pad to a block length, with 0x80 data terminator and + * size at the end + * 3. STAT pad - to ensure the STAT field is 4-byte aligned + */ +void spu2_request_pad(u8 *pad_start, u32 gcm_padding, u32 hash_pad_len, + enum hash_alg auth_alg, enum hash_mode auth_mode, + unsigned int total_sent, u32 status_padding) +{ + u8 *ptr = pad_start; + + /* fix data alignent for GCM */ + if (gcm_padding > 0) { + flow_log(" GCM: padding to 16 byte alignment: %u bytes\n", + gcm_padding); + memset(ptr, 0, gcm_padding); + ptr += gcm_padding; + } + + if (hash_pad_len > 0) { + /* clear the padding section */ + memset(ptr, 0, hash_pad_len); + + /* terminate the data */ + *ptr = 0x80; + ptr += (hash_pad_len - sizeof(u64)); + + /* add the size at the end as required per alg */ + if (auth_alg == HASH_ALG_MD5) + *(u64 *)ptr = cpu_to_le64((u64)total_sent * 8); + else /* SHA1, SHA2-224, SHA2-256 */ + *(u64 *)ptr = cpu_to_be64((u64)total_sent * 8); + ptr += sizeof(u64); + } + + /* pad to a 4byte alignment for STAT */ + if (status_padding > 0) { + flow_log(" STAT: padding to 4 byte alignment: %u bytes\n", + status_padding); + + memset(ptr, 0, status_padding); + ptr += status_padding; + } +} + +/** + * spu2_xts_tweak_in_payload() - Indicate that SPU2 does NOT place the XTS + * tweak field in the packet payload (it uses IV instead) + * + * Return: 0 + */ +u8 spu2_xts_tweak_in_payload(void) +{ + return 0; +} + +/** + * spu2_tx_status_len() - Return the length of the STATUS field in a SPU + * response message. + * + * Return: Length of STATUS field in bytes. + */ +u8 spu2_tx_status_len(void) +{ + return SPU2_TX_STATUS_LEN; +} + +/** + * spu2_rx_status_len() - Return the length of the STATUS field in a SPU + * response message. + * + * Return: Length of STATUS field in bytes. + */ +u8 spu2_rx_status_len(void) +{ + return SPU2_RX_STATUS_LEN; +} + +/** + * spu_status_process() - Process the status from a SPU response message. + * @statp: start of STATUS word + * + * Return: 0 - if status is good and response should be processed + * !0 - status indicates an error and response is invalid + */ +int spu2_status_process(u8 *statp) +{ + /* SPU2 status is 2 bytes by default - SPU_RX_STATUS_LEN */ + u16 status = le16_to_cpu(*(__le16 *)statp); + + if (status == 0) + return 0; + + flow_log("rx status is %#x\n", status); + if (status == SPU2_INVALID_ICV) + return SPU_INVALID_ICV; + + return -EBADMSG; +} + +/** + * spu2_ccm_update_iv() - Update the IV as per the requirements for CCM mode. + * + * @digestsize: Digest size of this request + * @cipher_parms: (pointer to) cipher parmaeters, includes IV buf & IV len + * @assoclen: Length of AAD data + * @chunksize: length of input data to be sent in this req + * @is_encrypt: true if this is an output/encrypt operation + * @is_esp: true if this is an ESP / RFC4309 operation + * + */ +void spu2_ccm_update_iv(unsigned int digestsize, + struct spu_cipher_parms *cipher_parms, + unsigned int assoclen, unsigned int chunksize, + bool is_encrypt, bool is_esp) +{ + int L; /* size of length field, in bytes */ + + /* + * In RFC4309 mode, L is fixed at 4 bytes; otherwise, IV from + * testmgr contains (L-1) in bottom 3 bits of first byte, + * per RFC 3610. + */ + if (is_esp) + L = CCM_ESP_L_VALUE; + else + L = ((cipher_parms->iv_buf[0] & CCM_B0_L_PRIME) >> + CCM_B0_L_PRIME_SHIFT) + 1; + + /* SPU2 doesn't want these length bytes nor the first byte... */ + cipher_parms->iv_len -= (1 + L); + memmove(cipher_parms->iv_buf, &cipher_parms->iv_buf[1], + cipher_parms->iv_len); +} + +/** + * spu2_wordalign_padlen() - SPU2 does not require padding. + * @data_size: length of data field in bytes + * + * Return: length of status field padding, in bytes (always 0 on SPU2) + */ +u32 spu2_wordalign_padlen(u32 data_size) +{ + return 0; +} |