/** * spu_sg_at_offset() - Find the scatterlist entry at a given distance from the * start of a scatterlist. * @sg: [in] Start of a scatterlist * @skip: [in] Distance from the start of the scatterlist, in bytes * @sge: [out] Scatterlist entry at skip bytes from start * @sge_offset: [out] Number of bytes from start of sge buffer to get to * requested distance. * * Return: 0 if entry found at requested distance * < 0 otherwise
*/ int spu_sg_at_offset(struct scatterlist *sg, unsignedint skip, struct scatterlist **sge, unsignedint *sge_offset)
{ /* byte index from start of sg to the end of the previous entry */ unsignedint index = 0; /* byte index from start of sg to the end of the current entry */ unsignedint next_index;
next_index = sg->length; while (next_index <= skip) {
sg = sg_next(sg);
index = next_index; if (!sg) return -EINVAL;
next_index += sg->length;
}
/* Copy len bytes of sg data, starting at offset skip, to a dest buffer */ void sg_copy_part_to_buf(struct scatterlist *src, u8 *dest, unsignedint len, unsignedint skip)
{
size_t copied; unsignedint nents = sg_nents(src);
copied = sg_pcopy_to_buffer(src, nents, dest, len, skip); if (copied != len) {
flow_log("%s copied %u bytes of %u requested. ",
__func__, (u32)copied, len);
flow_log("sg with %u entries and skip %u\n", nents, skip);
}
}
/* * Copy data into a scatterlist starting at a specified offset in the * scatterlist. Specifically, copy len bytes of data in the buffer src * into the scatterlist dest, starting skip bytes into the scatterlist.
*/ void sg_copy_part_from_buf(struct scatterlist *dest, u8 *src, unsignedint len, unsignedint skip)
{
size_t copied; unsignedint nents = sg_nents(dest);
copied = sg_pcopy_from_buffer(dest, nents, src, len, skip); if (copied != len) {
flow_log("%s copied %u bytes of %u requested. ",
__func__, (u32)copied, len);
flow_log("sg with %u entries and skip %u\n", nents, skip);
}
}
/** * spu_sg_count() - Determine number of elements in scatterlist to provide a * specified number of bytes. * @sg_list: scatterlist to examine * @skip: index of starting point * @nbytes: consider elements of scatterlist until reaching this number of * bytes * * Return: the number of sg entries contributing to nbytes of data
*/ int spu_sg_count(struct scatterlist *sg_list, unsignedint skip, int nbytes)
{ struct scatterlist *sg; int sg_nents = 0; unsignedint offset;
if (!sg_list) return 0;
if (spu_sg_at_offset(sg_list, skip, &sg, &offset) < 0) return 0;
/** * spu_msg_sg_add() - Copy scatterlist entries from one sg to another, up to a * given length. * @to_sg: scatterlist to copy to * @from_sg: scatterlist to copy from * @from_skip: number of bytes to skip in from_sg. Non-zero when previous * request included part of the buffer in entry in from_sg. * Assumes from_skip < from_sg->length. * @from_nents: number of entries in from_sg * @length: number of bytes to copy. may reach this limit before exhausting * from_sg. * * Copies the entries themselves, not the data in the entries. Assumes to_sg has * enough entries. Does not limit the size of an individual buffer in to_sg. * * to_sg, from_sg, skip are all updated to end of copy * * Return: Number of bytes copied
*/
u32 spu_msg_sg_add(struct scatterlist **to_sg, struct scatterlist **from_sg, u32 *from_skip,
u8 from_nents, u32 length)
{ struct scatterlist *sg; /* an entry in from_sg */ struct scatterlist *to = *to_sg; struct scatterlist *from = *from_sg;
u32 skip = *from_skip;
u32 offset; int i;
u32 entry_len = 0;
u32 frag_len = 0; /* length of entry added to to_sg */
u32 copied = 0; /* number of bytes copied so far */
if (length == 0) return 0;
for_each_sg(from, sg, from_nents, i) { /* number of bytes in this from entry not yet used */
entry_len = sg->length - skip;
frag_len = min(entry_len, length - copied);
offset = sg->offset + skip; if (frag_len)
sg_set_page(to++, sg_page(sg), frag_len, offset);
copied += frag_len; if (copied == entry_len) { /* used up all of from entry */
skip = 0; /* start at beginning of next entry */
} if (copied == length) break;
}
*to_sg = to;
*from_sg = sg; if (frag_len < entry_len)
*from_skip = skip + frag_len; else
*from_skip = 0;
*low_be = __cpu_to_be64(new_low); if (new_low < orig_low) /* there was a carry from the low 8 bytes */
*high_be = __cpu_to_be64(__be64_to_cpu(*high_be) + 1);
}
/** * do_shash() - Do a synchronous hash operation in software * @name: The name of the hash algorithm * @result: Buffer where digest is to be written * @data1: First part of data to hash. May be NULL. * @data1_len: Length of data1, in bytes * @data2: Second part of data to hash. May be NULL. * @data2_len: Length of data2, in bytes * @key: Key (if keyed hash) * @key_len: Length of key, in bytes (or 0 if non-keyed hash) * * Note that the crypto API will not select this driver's own transform because * this driver only registers asynchronous algos. * * Return: 0 if hash successfully stored in result * < 0 otherwise
*/ int do_shash(unsignedchar *name, unsignedchar *result, const u8 *data1, unsignedint data1_len, const u8 *data2, unsignedint data2_len, const u8 *key, unsignedint key_len)
{ int rc; unsignedint size; struct crypto_shash *hash; struct sdesc *sdesc;
#ifdef DEBUG /* Dump len bytes of a scatterlist starting at skip bytes into the sg */ void __dump_sg(struct scatterlist *sg, unsignedint skip, unsignedint len)
{
u8 dbuf[16]; unsignedint idx = skip; unsignedint num_out = 0; /* number of bytes dumped so far */ unsignedint count;
/* Returns the name for a given cipher alg/mode */ char *spu_alg_name(enum spu_cipher_alg alg, enum spu_cipher_mode mode)
{ switch (alg) { case CIPHER_ALG_RC4: return"rc4"; case CIPHER_ALG_AES: switch (mode) { case CIPHER_MODE_CBC: return"cbc(aes)"; case CIPHER_MODE_ECB: return"ecb(aes)"; case CIPHER_MODE_OFB: return"ofb(aes)"; case CIPHER_MODE_CFB: return"cfb(aes)"; case CIPHER_MODE_CTR: return"ctr(aes)"; case CIPHER_MODE_XTS: return"xts(aes)"; case CIPHER_MODE_GCM: return"gcm(aes)"; default: return"aes";
} break; case CIPHER_ALG_DES: switch (mode) { case CIPHER_MODE_CBC: return"cbc(des)"; case CIPHER_MODE_ECB: return"ecb(des)"; case CIPHER_MODE_CTR: return"ctr(des)"; default: return"des";
} break; case CIPHER_ALG_3DES: switch (mode) { case CIPHER_MODE_CBC: return"cbc(des3_ede)"; case CIPHER_MODE_ECB: return"ecb(des3_ede)"; case CIPHER_MODE_CTR: return"ctr(des3_ede)"; default: return"3des";
} break; default: return"other";
}
}
/* * Create the debug FS directories. If the top-level directory has not yet * been created, create it now. Create a stats file in this directory for * a SPU.
*/ void spu_setup_debugfs(void)
{ if (!debugfs_initialized()) return;
if (!iproc_priv.debugfs_dir)
iproc_priv.debugfs_dir = debugfs_create_dir(KBUILD_MODNAME,
NULL);
if (!iproc_priv.debugfs_stats) /* Create file with permissions S_IRUSR */
debugfs_create_file("stats", 0400, iproc_priv.debugfs_dir,
&iproc_priv, &spu_debugfs_stats);
}
/** * format_value_ccm() - Format a value into a buffer, using a specified number * of bytes (i.e. maybe writing value X into a 4 byte * buffer, or maybe into a 12 byte buffer), as per the * SPU CCM spec. * * @val: value to write (up to max of unsigned int) * @buf: (pointer to) buffer to write the value * @len: number of bytes to use (0 to 255) *
*/ void format_value_ccm(unsignedint val, u8 *buf, u8 len)
{ int i;
/* First clear full output buffer */
memset(buf, 0, len);
/* Then, starting from right side, fill in with data */ for (i = 0; i < len; i++) {
buf[len - i - 1] = (val >> (8 * i)) & 0xff; if (i >= 3) break; /* Only handle up to 32 bits of 'val' */
}
}
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