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linux-zen-desktop/drivers/crypto/bcm/cipher.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2016 Broadcom
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <linux/kthread.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <crypto/algapi.h>
#include <crypto/aead.h>
#include <crypto/internal/aead.h>
#include <crypto/aes.h>
#include <crypto/internal/des.h>
#include <crypto/hmac.h>
#include <crypto/md5.h>
#include <crypto/authenc.h>
#include <crypto/skcipher.h>
#include <crypto/hash.h>
#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include <crypto/sha3.h>
#include "util.h"
#include "cipher.h"
#include "spu.h"
#include "spum.h"
#include "spu2.h"
/* ================= Device Structure ================== */
struct bcm_device_private iproc_priv;
/* ==================== Parameters ===================== */
int flow_debug_logging;
module_param(flow_debug_logging, int, 0644);
MODULE_PARM_DESC(flow_debug_logging, "Enable Flow Debug Logging");
int packet_debug_logging;
module_param(packet_debug_logging, int, 0644);
MODULE_PARM_DESC(packet_debug_logging, "Enable Packet Debug Logging");
int debug_logging_sleep;
module_param(debug_logging_sleep, int, 0644);
MODULE_PARM_DESC(debug_logging_sleep, "Packet Debug Logging Sleep");
/*
* The value of these module parameters is used to set the priority for each
* algo type when this driver registers algos with the kernel crypto API.
* To use a priority other than the default, set the priority in the insmod or
* modprobe. Changing the module priority after init time has no effect.
*
* The default priorities are chosen to be lower (less preferred) than ARMv8 CE
* algos, but more preferred than generic software algos.
*/
static int cipher_pri = 150;
module_param(cipher_pri, int, 0644);
MODULE_PARM_DESC(cipher_pri, "Priority for cipher algos");
static int hash_pri = 100;
module_param(hash_pri, int, 0644);
MODULE_PARM_DESC(hash_pri, "Priority for hash algos");
static int aead_pri = 150;
module_param(aead_pri, int, 0644);
MODULE_PARM_DESC(aead_pri, "Priority for AEAD algos");
/* A type 3 BCM header, expected to precede the SPU header for SPU-M.
* Bits 3 and 4 in the first byte encode the channel number (the dma ringset).
* 0x60 - ring 0
* 0x68 - ring 1
* 0x70 - ring 2
* 0x78 - ring 3
*/
static char BCMHEADER[] = { 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28 };
/*
* Some SPU hw does not use BCM header on SPU messages. So BCM_HDR_LEN
* is set dynamically after reading SPU type from device tree.
*/
#define BCM_HDR_LEN iproc_priv.bcm_hdr_len
/* min and max time to sleep before retrying when mbox queue is full. usec */
#define MBOX_SLEEP_MIN 800
#define MBOX_SLEEP_MAX 1000
/**
* select_channel() - Select a SPU channel to handle a crypto request. Selects
* channel in round robin order.
*
* Return: channel index
*/
static u8 select_channel(void)
{
u8 chan_idx = atomic_inc_return(&iproc_priv.next_chan);
return chan_idx % iproc_priv.spu.num_chan;
}
/**
* spu_skcipher_rx_sg_create() - Build up the scatterlist of buffers used to
* receive a SPU response message for an skcipher request. Includes buffers to
* catch SPU message headers and the response data.
* @mssg: mailbox message containing the receive sg
* @rctx: crypto request context
* @rx_frag_num: number of scatterlist elements required to hold the
* SPU response message
* @chunksize: Number of bytes of response data expected
* @stat_pad_len: Number of bytes required to pad the STAT field to
* a 4-byte boundary
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Returns:
* 0 if successful
* < 0 if an error
*/
static int
spu_skcipher_rx_sg_create(struct brcm_message *mssg,
struct iproc_reqctx_s *rctx,
u8 rx_frag_num,
unsigned int chunksize, u32 stat_pad_len)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
struct iproc_ctx_s *ctx = rctx->ctx;
u32 datalen; /* Number of bytes of response data expected */
mssg->spu.dst = kcalloc(rx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (!mssg->spu.dst)
return -ENOMEM;
sg = mssg->spu.dst;
sg_init_table(sg, rx_frag_num);
/* Space for SPU message header */
sg_set_buf(sg++, rctx->msg_buf.spu_resp_hdr, ctx->spu_resp_hdr_len);
/* If XTS tweak in payload, add buffer to receive encrypted tweak */
if ((ctx->cipher.mode == CIPHER_MODE_XTS) &&
spu->spu_xts_tweak_in_payload())
sg_set_buf(sg++, rctx->msg_buf.c.supdt_tweak,
SPU_XTS_TWEAK_SIZE);
/* Copy in each dst sg entry from request, up to chunksize */
datalen = spu_msg_sg_add(&sg, &rctx->dst_sg, &rctx->dst_skip,
rctx->dst_nents, chunksize);
if (datalen < chunksize) {
pr_err("%s(): failed to copy dst sg to mbox msg. chunksize %u, datalen %u",
__func__, chunksize, datalen);
return -EFAULT;
}
if (stat_pad_len)
sg_set_buf(sg++, rctx->msg_buf.rx_stat_pad, stat_pad_len);
memset(rctx->msg_buf.rx_stat, 0, SPU_RX_STATUS_LEN);
sg_set_buf(sg, rctx->msg_buf.rx_stat, spu->spu_rx_status_len());
return 0;
}
/**
* spu_skcipher_tx_sg_create() - Build up the scatterlist of buffers used to
* send a SPU request message for an skcipher request. Includes SPU message
* headers and the request data.
* @mssg: mailbox message containing the transmit sg
* @rctx: crypto request context
* @tx_frag_num: number of scatterlist elements required to construct the
* SPU request message
* @chunksize: Number of bytes of request data
* @pad_len: Number of pad bytes
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Returns:
* 0 if successful
* < 0 if an error
*/
static int
spu_skcipher_tx_sg_create(struct brcm_message *mssg,
struct iproc_reqctx_s *rctx,
u8 tx_frag_num, unsigned int chunksize, u32 pad_len)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
struct iproc_ctx_s *ctx = rctx->ctx;
u32 datalen; /* Number of bytes of response data expected */
u32 stat_len;
mssg->spu.src = kcalloc(tx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (unlikely(!mssg->spu.src))
return -ENOMEM;
sg = mssg->spu.src;
sg_init_table(sg, tx_frag_num);
sg_set_buf(sg++, rctx->msg_buf.bcm_spu_req_hdr,
BCM_HDR_LEN + ctx->spu_req_hdr_len);
/* if XTS tweak in payload, copy from IV (where crypto API puts it) */
if ((ctx->cipher.mode == CIPHER_MODE_XTS) &&
spu->spu_xts_tweak_in_payload())
sg_set_buf(sg++, rctx->msg_buf.iv_ctr, SPU_XTS_TWEAK_SIZE);
/* Copy in each src sg entry from request, up to chunksize */
datalen = spu_msg_sg_add(&sg, &rctx->src_sg, &rctx->src_skip,
rctx->src_nents, chunksize);
if (unlikely(datalen < chunksize)) {
pr_err("%s(): failed to copy src sg to mbox msg",
__func__);
return -EFAULT;
}
if (pad_len)
sg_set_buf(sg++, rctx->msg_buf.spu_req_pad, pad_len);
stat_len = spu->spu_tx_status_len();
if (stat_len) {
memset(rctx->msg_buf.tx_stat, 0, stat_len);
sg_set_buf(sg, rctx->msg_buf.tx_stat, stat_len);
}
return 0;
}
static int mailbox_send_message(struct brcm_message *mssg, u32 flags,
u8 chan_idx)
{
int err;
int retry_cnt = 0;
struct device *dev = &(iproc_priv.pdev->dev);
err = mbox_send_message(iproc_priv.mbox[chan_idx], mssg);
if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) {
while ((err == -ENOBUFS) && (retry_cnt < SPU_MB_RETRY_MAX)) {
/*
* Mailbox queue is full. Since MAY_SLEEP is set, assume
* not in atomic context and we can wait and try again.
*/
retry_cnt++;
usleep_range(MBOX_SLEEP_MIN, MBOX_SLEEP_MAX);
err = mbox_send_message(iproc_priv.mbox[chan_idx],
mssg);
atomic_inc(&iproc_priv.mb_no_spc);
}
}
if (err < 0) {
atomic_inc(&iproc_priv.mb_send_fail);
return err;
}
/* Check error returned by mailbox controller */
err = mssg->error;
if (unlikely(err < 0)) {
dev_err(dev, "message error %d", err);
/* Signal txdone for mailbox channel */
}
/* Signal txdone for mailbox channel */
mbox_client_txdone(iproc_priv.mbox[chan_idx], err);
return err;
}
/**
* handle_skcipher_req() - Submit as much of a block cipher request as fits in
* a single SPU request message, starting at the current position in the request
* data.
* @rctx: Crypto request context
*
* This may be called on the crypto API thread, or, when a request is so large
* it must be broken into multiple SPU messages, on the thread used to invoke
* the response callback. When requests are broken into multiple SPU
* messages, we assume subsequent messages depend on previous results, and
* thus always wait for previous results before submitting the next message.
* Because requests are submitted in lock step like this, there is no need
* to synchronize access to request data structures.
*
* Return: -EINPROGRESS: request has been accepted and result will be returned
* asynchronously
* Any other value indicates an error
*/
static int handle_skcipher_req(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct skcipher_request *req =
container_of(areq, struct skcipher_request, base);
struct iproc_ctx_s *ctx = rctx->ctx;
struct spu_cipher_parms cipher_parms;
int err;
unsigned int chunksize; /* Num bytes of request to submit */
int remaining; /* Bytes of request still to process */
int chunk_start; /* Beginning of data for current SPU msg */
/* IV or ctr value to use in this SPU msg */
u8 local_iv_ctr[MAX_IV_SIZE];
u32 stat_pad_len; /* num bytes to align status field */
u32 pad_len; /* total length of all padding */
struct brcm_message *mssg; /* mailbox message */
/* number of entries in src and dst sg in mailbox message. */
u8 rx_frag_num = 2; /* response header and STATUS */
u8 tx_frag_num = 1; /* request header */
flow_log("%s\n", __func__);
cipher_parms.alg = ctx->cipher.alg;
cipher_parms.mode = ctx->cipher.mode;
cipher_parms.type = ctx->cipher_type;
cipher_parms.key_len = ctx->enckeylen;
cipher_parms.key_buf = ctx->enckey;
cipher_parms.iv_buf = local_iv_ctr;
cipher_parms.iv_len = rctx->iv_ctr_len;
mssg = &rctx->mb_mssg;
chunk_start = rctx->src_sent;
remaining = rctx->total_todo - chunk_start;
/* determine the chunk we are breaking off and update the indexes */
if ((ctx->max_payload != SPU_MAX_PAYLOAD_INF) &&
(remaining > ctx->max_payload))
chunksize = ctx->max_payload;
else
chunksize = remaining;
rctx->src_sent += chunksize;
rctx->total_sent = rctx->src_sent;
/* Count number of sg entries to be included in this request */
rctx->src_nents = spu_sg_count(rctx->src_sg, rctx->src_skip, chunksize);
rctx->dst_nents = spu_sg_count(rctx->dst_sg, rctx->dst_skip, chunksize);
if ((ctx->cipher.mode == CIPHER_MODE_CBC) &&
rctx->is_encrypt && chunk_start)
/*
* Encrypting non-first first chunk. Copy last block of
* previous result to IV for this chunk.
*/
sg_copy_part_to_buf(req->dst, rctx->msg_buf.iv_ctr,
rctx->iv_ctr_len,
chunk_start - rctx->iv_ctr_len);
if (rctx->iv_ctr_len) {
/* get our local copy of the iv */
__builtin_memcpy(local_iv_ctr, rctx->msg_buf.iv_ctr,
rctx->iv_ctr_len);
/* generate the next IV if possible */
if ((ctx->cipher.mode == CIPHER_MODE_CBC) &&
!rctx->is_encrypt) {
/*
* CBC Decrypt: next IV is the last ciphertext block in
* this chunk
*/
sg_copy_part_to_buf(req->src, rctx->msg_buf.iv_ctr,
rctx->iv_ctr_len,
rctx->src_sent - rctx->iv_ctr_len);
} else if (ctx->cipher.mode == CIPHER_MODE_CTR) {
/*
* The SPU hardware increments the counter once for
* each AES block of 16 bytes. So update the counter
* for the next chunk, if there is one. Note that for
* this chunk, the counter has already been copied to
* local_iv_ctr. We can assume a block size of 16,
* because we only support CTR mode for AES, not for
* any other cipher alg.
*/
add_to_ctr(rctx->msg_buf.iv_ctr, chunksize >> 4);
}
}
if (ctx->max_payload == SPU_MAX_PAYLOAD_INF)
flow_log("max_payload infinite\n");
else
flow_log("max_payload %u\n", ctx->max_payload);
flow_log("sent:%u start:%u remains:%u size:%u\n",
rctx->src_sent, chunk_start, remaining, chunksize);
/* Copy SPU header template created at setkey time */
memcpy(rctx->msg_buf.bcm_spu_req_hdr, ctx->bcm_spu_req_hdr,
sizeof(rctx->msg_buf.bcm_spu_req_hdr));
spu->spu_cipher_req_finish(rctx->msg_buf.bcm_spu_req_hdr + BCM_HDR_LEN,
ctx->spu_req_hdr_len, !(rctx->is_encrypt),
&cipher_parms, chunksize);
atomic64_add(chunksize, &iproc_priv.bytes_out);
stat_pad_len = spu->spu_wordalign_padlen(chunksize);
if (stat_pad_len)
rx_frag_num++;
pad_len = stat_pad_len;
if (pad_len) {
tx_frag_num++;
spu->spu_request_pad(rctx->msg_buf.spu_req_pad, 0,
0, ctx->auth.alg, ctx->auth.mode,
rctx->total_sent, stat_pad_len);
}
spu->spu_dump_msg_hdr(rctx->msg_buf.bcm_spu_req_hdr + BCM_HDR_LEN,
ctx->spu_req_hdr_len);
packet_log("payload:\n");
dump_sg(rctx->src_sg, rctx->src_skip, chunksize);
packet_dump(" pad: ", rctx->msg_buf.spu_req_pad, pad_len);
/*
* Build mailbox message containing SPU request msg and rx buffers
* to catch response message
*/
memset(mssg, 0, sizeof(*mssg));
mssg->type = BRCM_MESSAGE_SPU;
mssg->ctx = rctx; /* Will be returned in response */
/* Create rx scatterlist to catch result */
rx_frag_num += rctx->dst_nents;
if ((ctx->cipher.mode == CIPHER_MODE_XTS) &&
spu->spu_xts_tweak_in_payload())
rx_frag_num++; /* extra sg to insert tweak */
err = spu_skcipher_rx_sg_create(mssg, rctx, rx_frag_num, chunksize,
stat_pad_len);
if (err)
return err;
/* Create tx scatterlist containing SPU request message */
tx_frag_num += rctx->src_nents;
if (spu->spu_tx_status_len())
tx_frag_num++;
if ((ctx->cipher.mode == CIPHER_MODE_XTS) &&
spu->spu_xts_tweak_in_payload())
tx_frag_num++; /* extra sg to insert tweak */
err = spu_skcipher_tx_sg_create(mssg, rctx, tx_frag_num, chunksize,
pad_len);
if (err)
return err;
err = mailbox_send_message(mssg, req->base.flags, rctx->chan_idx);
if (unlikely(err < 0))
return err;
return -EINPROGRESS;
}
/**
* handle_skcipher_resp() - Process a block cipher SPU response. Updates the
* total received count for the request and updates global stats.
* @rctx: Crypto request context
*/
static void handle_skcipher_resp(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct skcipher_request *req = skcipher_request_cast(areq);
struct iproc_ctx_s *ctx = rctx->ctx;
u32 payload_len;
/* See how much data was returned */
payload_len = spu->spu_payload_length(rctx->msg_buf.spu_resp_hdr);
/*
* In XTS mode, the first SPU_XTS_TWEAK_SIZE bytes may be the
* encrypted tweak ("i") value; we don't count those.
*/
if ((ctx->cipher.mode == CIPHER_MODE_XTS) &&
spu->spu_xts_tweak_in_payload() &&
(payload_len >= SPU_XTS_TWEAK_SIZE))
payload_len -= SPU_XTS_TWEAK_SIZE;
atomic64_add(payload_len, &iproc_priv.bytes_in);
flow_log("%s() offset: %u, bd_len: %u BD:\n",
__func__, rctx->total_received, payload_len);
dump_sg(req->dst, rctx->total_received, payload_len);
rctx->total_received += payload_len;
if (rctx->total_received == rctx->total_todo) {
atomic_inc(&iproc_priv.op_counts[SPU_OP_CIPHER]);
atomic_inc(
&iproc_priv.cipher_cnt[ctx->cipher.alg][ctx->cipher.mode]);
}
}
/**
* spu_ahash_rx_sg_create() - Build up the scatterlist of buffers used to
* receive a SPU response message for an ahash request.
* @mssg: mailbox message containing the receive sg
* @rctx: crypto request context
* @rx_frag_num: number of scatterlist elements required to hold the
* SPU response message
* @digestsize: length of hash digest, in bytes
* @stat_pad_len: Number of bytes required to pad the STAT field to
* a 4-byte boundary
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Return:
* 0 if successful
* < 0 if an error
*/
static int
spu_ahash_rx_sg_create(struct brcm_message *mssg,
struct iproc_reqctx_s *rctx,
u8 rx_frag_num, unsigned int digestsize,
u32 stat_pad_len)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
struct iproc_ctx_s *ctx = rctx->ctx;
mssg->spu.dst = kcalloc(rx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (!mssg->spu.dst)
return -ENOMEM;
sg = mssg->spu.dst;
sg_init_table(sg, rx_frag_num);
/* Space for SPU message header */
sg_set_buf(sg++, rctx->msg_buf.spu_resp_hdr, ctx->spu_resp_hdr_len);
/* Space for digest */
sg_set_buf(sg++, rctx->msg_buf.digest, digestsize);
if (stat_pad_len)
sg_set_buf(sg++, rctx->msg_buf.rx_stat_pad, stat_pad_len);
memset(rctx->msg_buf.rx_stat, 0, SPU_RX_STATUS_LEN);
sg_set_buf(sg, rctx->msg_buf.rx_stat, spu->spu_rx_status_len());
return 0;
}
/**
* spu_ahash_tx_sg_create() - Build up the scatterlist of buffers used to send
* a SPU request message for an ahash request. Includes SPU message headers and
* the request data.
* @mssg: mailbox message containing the transmit sg
* @rctx: crypto request context
* @tx_frag_num: number of scatterlist elements required to construct the
* SPU request message
* @spu_hdr_len: length in bytes of SPU message header
* @hash_carry_len: Number of bytes of data carried over from previous req
* @new_data_len: Number of bytes of new request data
* @pad_len: Number of pad bytes
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Return:
* 0 if successful
* < 0 if an error
*/
static int
spu_ahash_tx_sg_create(struct brcm_message *mssg,
struct iproc_reqctx_s *rctx,
u8 tx_frag_num,
u32 spu_hdr_len,
unsigned int hash_carry_len,
unsigned int new_data_len, u32 pad_len)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
u32 datalen; /* Number of bytes of response data expected */
u32 stat_len;
mssg->spu.src = kcalloc(tx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (!mssg->spu.src)
return -ENOMEM;
sg = mssg->spu.src;
sg_init_table(sg, tx_frag_num);
sg_set_buf(sg++, rctx->msg_buf.bcm_spu_req_hdr,
BCM_HDR_LEN + spu_hdr_len);
if (hash_carry_len)
sg_set_buf(sg++, rctx->hash_carry, hash_carry_len);
if (new_data_len) {
/* Copy in each src sg entry from request, up to chunksize */
datalen = spu_msg_sg_add(&sg, &rctx->src_sg, &rctx->src_skip,
rctx->src_nents, new_data_len);
if (datalen < new_data_len) {
pr_err("%s(): failed to copy src sg to mbox msg",
__func__);
return -EFAULT;
}
}
if (pad_len)
sg_set_buf(sg++, rctx->msg_buf.spu_req_pad, pad_len);
stat_len = spu->spu_tx_status_len();
if (stat_len) {
memset(rctx->msg_buf.tx_stat, 0, stat_len);
sg_set_buf(sg, rctx->msg_buf.tx_stat, stat_len);
}
return 0;
}
/**
* handle_ahash_req() - Process an asynchronous hash request from the crypto
* API.
* @rctx: Crypto request context
*
* Builds a SPU request message embedded in a mailbox message and submits the
* mailbox message on a selected mailbox channel. The SPU request message is
* constructed as a scatterlist, including entries from the crypto API's
* src scatterlist to avoid copying the data to be hashed. This function is
* called either on the thread from the crypto API, or, in the case that the
* crypto API request is too large to fit in a single SPU request message,
* on the thread that invokes the receive callback with a response message.
* Because some operations require the response from one chunk before the next
* chunk can be submitted, we always wait for the response for the previous
* chunk before submitting the next chunk. Because requests are submitted in
* lock step like this, there is no need to synchronize access to request data
* structures.
*
* Return:
* -EINPROGRESS: request has been submitted to SPU and response will be
* returned asynchronously
* -EAGAIN: non-final request included a small amount of data, which for
* efficiency we did not submit to the SPU, but instead stored
* to be submitted to the SPU with the next part of the request
* other: an error code
*/
static int handle_ahash_req(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct ahash_request *req = ahash_request_cast(areq);
struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
struct crypto_tfm *tfm = crypto_ahash_tfm(ahash);
unsigned int blocksize = crypto_tfm_alg_blocksize(tfm);
struct iproc_ctx_s *ctx = rctx->ctx;
/* number of bytes still to be hashed in this req */
unsigned int nbytes_to_hash = 0;
int err;
unsigned int chunksize = 0; /* length of hash carry + new data */
/*
* length of new data, not from hash carry, to be submitted in
* this hw request
*/
unsigned int new_data_len;
unsigned int __maybe_unused chunk_start = 0;
u32 db_size; /* Length of data field, incl gcm and hash padding */
int pad_len = 0; /* total pad len, including gcm, hash, stat padding */
u32 data_pad_len = 0; /* length of GCM/CCM padding */
u32 stat_pad_len = 0; /* length of padding to align STATUS word */
struct brcm_message *mssg; /* mailbox message */
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 local_nbuf;
u32 spu_hdr_len;
unsigned int digestsize;
u16 rem = 0;
/*
* number of entries in src and dst sg. Always includes SPU msg header.
* rx always includes a buffer to catch digest and STATUS.
*/
u8 rx_frag_num = 3;
u8 tx_frag_num = 1;
flow_log("total_todo %u, total_sent %u\n",
rctx->total_todo, rctx->total_sent);
memset(&req_opts, 0, sizeof(req_opts));
memset(&cipher_parms, 0, sizeof(cipher_parms));
memset(&hash_parms, 0, sizeof(hash_parms));
memset(&aead_parms, 0, sizeof(aead_parms));
req_opts.bd_suppress = true;
hash_parms.alg = ctx->auth.alg;
hash_parms.mode = ctx->auth.mode;
hash_parms.type = HASH_TYPE_NONE;
hash_parms.key_buf = (u8 *)ctx->authkey;
hash_parms.key_len = ctx->authkeylen;
/*
* For hash algorithms below assignment looks bit odd but
* it's needed for AES-XCBC and AES-CMAC hash algorithms
* to differentiate between 128, 192, 256 bit key values.
* Based on the key values, hash algorithm is selected.
* For example for 128 bit key, hash algorithm is AES-128.
*/
cipher_parms.type = ctx->cipher_type;
mssg = &rctx->mb_mssg;
chunk_start = rctx->src_sent;
/*
* Compute the amount remaining to hash. This may include data
* carried over from previous requests.
*/
nbytes_to_hash = rctx->total_todo - rctx->total_sent;
chunksize = nbytes_to_hash;
if ((ctx->max_payload != SPU_MAX_PAYLOAD_INF) &&
(chunksize > ctx->max_payload))
chunksize = ctx->max_payload;
/*
* If this is not a final request and the request data is not a multiple
* of a full block, then simply park the extra data and prefix it to the
* data for the next request.
*/
if (!rctx->is_final) {
u8 *dest = rctx->hash_carry + rctx->hash_carry_len;
u16 new_len; /* len of data to add to hash carry */
rem = chunksize % blocksize; /* remainder */
if (rem) {
/* chunksize not a multiple of blocksize */
chunksize -= rem;
if (chunksize == 0) {
/* Don't have a full block to submit to hw */
new_len = rem - rctx->hash_carry_len;
sg_copy_part_to_buf(req->src, dest, new_len,
rctx->src_sent);
rctx->hash_carry_len = rem;
flow_log("Exiting with hash carry len: %u\n",
rctx->hash_carry_len);
packet_dump(" buf: ",
rctx->hash_carry,
rctx->hash_carry_len);
return -EAGAIN;
}
}
}
/* if we have hash carry, then prefix it to the data in this request */
local_nbuf = rctx->hash_carry_len;
rctx->hash_carry_len = 0;
if (local_nbuf)
tx_frag_num++;
new_data_len = chunksize - local_nbuf;
/* Count number of sg entries to be used in this request */
rctx->src_nents = spu_sg_count(rctx->src_sg, rctx->src_skip,
new_data_len);
/* AES hashing keeps key size in type field, so need to copy it here */
if (hash_parms.alg == HASH_ALG_AES)
hash_parms.type = (enum hash_type)cipher_parms.type;
else
hash_parms.type = spu->spu_hash_type(rctx->total_sent);
digestsize = spu->spu_digest_size(ctx->digestsize, ctx->auth.alg,
hash_parms.type);
hash_parms.digestsize = digestsize;
/* update the indexes */
rctx->total_sent += chunksize;
/* if you sent a prebuf then that wasn't from this req->src */
rctx->src_sent += new_data_len;
if ((rctx->total_sent == rctx->total_todo) && rctx->is_final)
hash_parms.pad_len = spu->spu_hash_pad_len(hash_parms.alg,
hash_parms.mode,
chunksize,
blocksize);
/*
* If a non-first chunk, then include the digest returned from the
* previous chunk so that hw can add to it (except for AES types).
*/
if ((hash_parms.type == HASH_TYPE_UPDT) &&
(hash_parms.alg != HASH_ALG_AES)) {
hash_parms.key_buf = rctx->incr_hash;
hash_parms.key_len = digestsize;
}
atomic64_add(chunksize, &iproc_priv.bytes_out);
flow_log("%s() final: %u nbuf: %u ",
__func__, rctx->is_final, local_nbuf);
if (ctx->max_payload == SPU_MAX_PAYLOAD_INF)
flow_log("max_payload infinite\n");
else
flow_log("max_payload %u\n", ctx->max_payload);
flow_log("chunk_start: %u chunk_size: %u\n", chunk_start, chunksize);
/* Prepend SPU header with type 3 BCM header */
memcpy(rctx->msg_buf.bcm_spu_req_hdr, BCMHEADER, BCM_HDR_LEN);
hash_parms.prebuf_len = local_nbuf;
spu_hdr_len = spu->spu_create_request(rctx->msg_buf.bcm_spu_req_hdr +
BCM_HDR_LEN,
&req_opts, &cipher_parms,
&hash_parms, &aead_parms,
new_data_len);
if (spu_hdr_len == 0) {
pr_err("Failed to create SPU request header\n");
return -EFAULT;
}
/*
* Determine total length of padding required. Put all padding in one
* buffer.
*/
data_pad_len = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode, chunksize);
db_size = spu_real_db_size(0, 0, local_nbuf, new_data_len,
0, 0, hash_parms.pad_len);
if (spu->spu_tx_status_len())
stat_pad_len = spu->spu_wordalign_padlen(db_size);
if (stat_pad_len)
rx_frag_num++;
pad_len = hash_parms.pad_len + data_pad_len + stat_pad_len;
if (pad_len) {
tx_frag_num++;
spu->spu_request_pad(rctx->msg_buf.spu_req_pad, data_pad_len,
hash_parms.pad_len, ctx->auth.alg,
ctx->auth.mode, rctx->total_sent,
stat_pad_len);
}
spu->spu_dump_msg_hdr(rctx->msg_buf.bcm_spu_req_hdr + BCM_HDR_LEN,
spu_hdr_len);
packet_dump(" prebuf: ", rctx->hash_carry, local_nbuf);
flow_log("Data:\n");
dump_sg(rctx->src_sg, rctx->src_skip, new_data_len);
packet_dump(" pad: ", rctx->msg_buf.spu_req_pad, pad_len);
/*
* Build mailbox message containing SPU request msg and rx buffers
* to catch response message
*/
memset(mssg, 0, sizeof(*mssg));
mssg->type = BRCM_MESSAGE_SPU;
mssg->ctx = rctx; /* Will be returned in response */
/* Create rx scatterlist to catch result */
err = spu_ahash_rx_sg_create(mssg, rctx, rx_frag_num, digestsize,
stat_pad_len);
if (err)
return err;
/* Create tx scatterlist containing SPU request message */
tx_frag_num += rctx->src_nents;
if (spu->spu_tx_status_len())
tx_frag_num++;
err = spu_ahash_tx_sg_create(mssg, rctx, tx_frag_num, spu_hdr_len,
local_nbuf, new_data_len, pad_len);
if (err)
return err;
err = mailbox_send_message(mssg, req->base.flags, rctx->chan_idx);
if (unlikely(err < 0))
return err;
return -EINPROGRESS;
}
/**
* spu_hmac_outer_hash() - Request synchonous software compute of the outer hash
* for an HMAC request.
* @req: The HMAC request from the crypto API
* @ctx: The session context
*
* Return: 0 if synchronous hash operation successful
* -EINVAL if the hash algo is unrecognized
* any other value indicates an error
*/
static int spu_hmac_outer_hash(struct ahash_request *req,
struct iproc_ctx_s *ctx)
{
struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
unsigned int blocksize =
crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash));
int rc;
switch (ctx->auth.alg) {
case HASH_ALG_MD5:
rc = do_shash("md5", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
case HASH_ALG_SHA1:
rc = do_shash("sha1", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
case HASH_ALG_SHA224:
rc = do_shash("sha224", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
case HASH_ALG_SHA256:
rc = do_shash("sha256", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
case HASH_ALG_SHA384:
rc = do_shash("sha384", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
case HASH_ALG_SHA512:
rc = do_shash("sha512", req->result, ctx->opad, blocksize,
req->result, ctx->digestsize, NULL, 0);
break;
default:
pr_err("%s() Error : unknown hmac type\n", __func__);
rc = -EINVAL;
}
return rc;
}
/**
* ahash_req_done() - Process a hash result from the SPU hardware.
* @rctx: Crypto request context
*
* Return: 0 if successful
* < 0 if an error
*/
static int ahash_req_done(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct ahash_request *req = ahash_request_cast(areq);
struct iproc_ctx_s *ctx = rctx->ctx;
int err;
memcpy(req->result, rctx->msg_buf.digest, ctx->digestsize);
if (spu->spu_type == SPU_TYPE_SPUM) {
/* byte swap the output from the UPDT function to network byte
* order
*/
if (ctx->auth.alg == HASH_ALG_MD5) {
__swab32s((u32 *)req->result);
__swab32s(((u32 *)req->result) + 1);
__swab32s(((u32 *)req->result) + 2);
__swab32s(((u32 *)req->result) + 3);
__swab32s(((u32 *)req->result) + 4);
}
}
flow_dump(" digest ", req->result, ctx->digestsize);
/* if this an HMAC then do the outer hash */
if (rctx->is_sw_hmac) {
err = spu_hmac_outer_hash(req, ctx);
if (err < 0)
return err;
flow_dump(" hmac: ", req->result, ctx->digestsize);
}
if (rctx->is_sw_hmac || ctx->auth.mode == HASH_MODE_HMAC) {
atomic_inc(&iproc_priv.op_counts[SPU_OP_HMAC]);
atomic_inc(&iproc_priv.hmac_cnt[ctx->auth.alg]);
} else {
atomic_inc(&iproc_priv.op_counts[SPU_OP_HASH]);
atomic_inc(&iproc_priv.hash_cnt[ctx->auth.alg]);
}
return 0;
}
/**
* handle_ahash_resp() - Process a SPU response message for a hash request.
* Checks if the entire crypto API request has been processed, and if so,
* invokes post processing on the result.
* @rctx: Crypto request context
*/
static void handle_ahash_resp(struct iproc_reqctx_s *rctx)
{
struct iproc_ctx_s *ctx = rctx->ctx;
struct crypto_async_request *areq = rctx->parent;
struct ahash_request *req = ahash_request_cast(areq);
struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
unsigned int blocksize =
crypto_tfm_alg_blocksize(crypto_ahash_tfm(ahash));
/*
* Save hash to use as input to next op if incremental. Might be copying
* too much, but that's easier than figuring out actual digest size here
*/
memcpy(rctx->incr_hash, rctx->msg_buf.digest, MAX_DIGEST_SIZE);
flow_log("%s() blocksize:%u digestsize:%u\n",
__func__, blocksize, ctx->digestsize);
atomic64_add(ctx->digestsize, &iproc_priv.bytes_in);
if (rctx->is_final && (rctx->total_sent == rctx->total_todo))
ahash_req_done(rctx);
}
/**
* spu_aead_rx_sg_create() - Build up the scatterlist of buffers used to receive
* a SPU response message for an AEAD request. Includes buffers to catch SPU
* message headers and the response data.
* @mssg: mailbox message containing the receive sg
* @req: Crypto API request
* @rctx: crypto request context
* @rx_frag_num: number of scatterlist elements required to hold the
* SPU response message
* @assoc_len: Length of associated data included in the crypto request
* @ret_iv_len: Length of IV returned in response
* @resp_len: Number of bytes of response data expected to be written to
* dst buffer from crypto API
* @digestsize: Length of hash digest, in bytes
* @stat_pad_len: Number of bytes required to pad the STAT field to
* a 4-byte boundary
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Returns:
* 0 if successful
* < 0 if an error
*/
static int spu_aead_rx_sg_create(struct brcm_message *mssg,
struct aead_request *req,
struct iproc_reqctx_s *rctx,
u8 rx_frag_num,
unsigned int assoc_len,
u32 ret_iv_len, unsigned int resp_len,
unsigned int digestsize, u32 stat_pad_len)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
struct iproc_ctx_s *ctx = rctx->ctx;
u32 datalen; /* Number of bytes of response data expected */
u32 assoc_buf_len;
u8 data_padlen = 0;
if (ctx->is_rfc4543) {
/* RFC4543: only pad after data, not after AAD */
data_padlen = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
assoc_len + resp_len);
assoc_buf_len = assoc_len;
} else {
data_padlen = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
resp_len);
assoc_buf_len = spu->spu_assoc_resp_len(ctx->cipher.mode,
assoc_len, ret_iv_len,
rctx->is_encrypt);
}
if (ctx->cipher.mode == CIPHER_MODE_CCM)
/* ICV (after data) must be in the next 32-bit word for CCM */
data_padlen += spu->spu_wordalign_padlen(assoc_buf_len +
resp_len +
data_padlen);
if (data_padlen)
/* have to catch gcm pad in separate buffer */
rx_frag_num++;
mssg->spu.dst = kcalloc(rx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (!mssg->spu.dst)
return -ENOMEM;
sg = mssg->spu.dst;
sg_init_table(sg, rx_frag_num);
/* Space for SPU message header */
sg_set_buf(sg++, rctx->msg_buf.spu_resp_hdr, ctx->spu_resp_hdr_len);
if (assoc_buf_len) {
/*
* Don't write directly to req->dst, because SPU may pad the
* assoc data in the response
*/
memset(rctx->msg_buf.a.resp_aad, 0, assoc_buf_len);
sg_set_buf(sg++, rctx->msg_buf.a.resp_aad, assoc_buf_len);
}
if (resp_len) {
/*
* Copy in each dst sg entry from request, up to chunksize.
* dst sg catches just the data. digest caught in separate buf.
*/
datalen = spu_msg_sg_add(&sg, &rctx->dst_sg, &rctx->dst_skip,
rctx->dst_nents, resp_len);
if (datalen < (resp_len)) {
pr_err("%s(): failed to copy dst sg to mbox msg. expected len %u, datalen %u",
__func__, resp_len, datalen);
return -EFAULT;
}
}
/* If GCM/CCM data is padded, catch padding in separate buffer */
if (data_padlen) {
memset(rctx->msg_buf.a.gcmpad, 0, data_padlen);
sg_set_buf(sg++, rctx->msg_buf.a.gcmpad, data_padlen);
}
/* Always catch ICV in separate buffer */
sg_set_buf(sg++, rctx->msg_buf.digest, digestsize);
flow_log("stat_pad_len %u\n", stat_pad_len);
if (stat_pad_len) {
memset(rctx->msg_buf.rx_stat_pad, 0, stat_pad_len);
sg_set_buf(sg++, rctx->msg_buf.rx_stat_pad, stat_pad_len);
}
memset(rctx->msg_buf.rx_stat, 0, SPU_RX_STATUS_LEN);
sg_set_buf(sg, rctx->msg_buf.rx_stat, spu->spu_rx_status_len());
return 0;
}
/**
* spu_aead_tx_sg_create() - Build up the scatterlist of buffers used to send a
* SPU request message for an AEAD request. Includes SPU message headers and the
* request data.
* @mssg: mailbox message containing the transmit sg
* @rctx: crypto request context
* @tx_frag_num: number of scatterlist elements required to construct the
* SPU request message
* @spu_hdr_len: length of SPU message header in bytes
* @assoc: crypto API associated data scatterlist
* @assoc_len: length of associated data
* @assoc_nents: number of scatterlist entries containing assoc data
* @aead_iv_len: length of AEAD IV, if included
* @chunksize: Number of bytes of request data
* @aad_pad_len: Number of bytes of padding at end of AAD. For GCM/CCM.
* @pad_len: Number of pad bytes
* @incl_icv: If true, write separate ICV buffer after data and
* any padding
*
* The scatterlist that gets allocated here is freed in spu_chunk_cleanup()
* when the request completes, whether the request is handled successfully or
* there is an error.
*
* Return:
* 0 if successful
* < 0 if an error
*/
static int spu_aead_tx_sg_create(struct brcm_message *mssg,
struct iproc_reqctx_s *rctx,
u8 tx_frag_num,
u32 spu_hdr_len,
struct scatterlist *assoc,
unsigned int assoc_len,
int assoc_nents,
unsigned int aead_iv_len,
unsigned int chunksize,
u32 aad_pad_len, u32 pad_len, bool incl_icv)
{
struct spu_hw *spu = &iproc_priv.spu;
struct scatterlist *sg; /* used to build sgs in mbox message */
struct scatterlist *assoc_sg = assoc;
struct iproc_ctx_s *ctx = rctx->ctx;
u32 datalen; /* Number of bytes of data to write */
u32 written; /* Number of bytes of data written */
u32 assoc_offset = 0;
u32 stat_len;
mssg->spu.src = kcalloc(tx_frag_num, sizeof(struct scatterlist),
rctx->gfp);
if (!mssg->spu.src)
return -ENOMEM;
sg = mssg->spu.src;
sg_init_table(sg, tx_frag_num);
sg_set_buf(sg++, rctx->msg_buf.bcm_spu_req_hdr,
BCM_HDR_LEN + spu_hdr_len);
if (assoc_len) {
/* Copy in each associated data sg entry from request */
written = spu_msg_sg_add(&sg, &assoc_sg, &assoc_offset,
assoc_nents, assoc_len);
if (written < assoc_len) {
pr_err("%s(): failed to copy assoc sg to mbox msg",
__func__);
return -EFAULT;
}
}
if (aead_iv_len)
sg_set_buf(sg++, rctx->msg_buf.iv_ctr, aead_iv_len);
if (aad_pad_len) {
memset(rctx->msg_buf.a.req_aad_pad, 0, aad_pad_len);
sg_set_buf(sg++, rctx->msg_buf.a.req_aad_pad, aad_pad_len);
}
datalen = chunksize;
if ((chunksize > ctx->digestsize) && incl_icv)
datalen -= ctx->digestsize;
if (datalen) {
/* For aead, a single msg should consume the entire src sg */
written = spu_msg_sg_add(&sg, &rctx->src_sg, &rctx->src_skip,
rctx->src_nents, datalen);
if (written < datalen) {
pr_err("%s(): failed to copy src sg to mbox msg",
__func__);
return -EFAULT;
}
}
if (pad_len) {
memset(rctx->msg_buf.spu_req_pad, 0, pad_len);
sg_set_buf(sg++, rctx->msg_buf.spu_req_pad, pad_len);
}
if (incl_icv)
sg_set_buf(sg++, rctx->msg_buf.digest, ctx->digestsize);
stat_len = spu->spu_tx_status_len();
if (stat_len) {
memset(rctx->msg_buf.tx_stat, 0, stat_len);
sg_set_buf(sg, rctx->msg_buf.tx_stat, stat_len);
}
return 0;
}
/**
* handle_aead_req() - Submit a SPU request message for the next chunk of the
* current AEAD request.
* @rctx: Crypto request context
*
* Unlike other operation types, we assume the length of the request fits in
* a single SPU request message. aead_enqueue() makes sure this is true.
* Comments for other op types regarding threads applies here as well.
*
* Unlike incremental hash ops, where the spu returns the entire hash for
* truncated algs like sha-224, the SPU returns just the truncated hash in
* response to aead requests. So digestsize is always ctx->digestsize here.
*
* Return: -EINPROGRESS: crypto request has been accepted and result will be
* returned asynchronously
* Any other value indicates an error
*/
static int handle_aead_req(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct aead_request *req = container_of(areq,
struct aead_request, base);
struct iproc_ctx_s *ctx = rctx->ctx;
int err;
unsigned int chunksize;
unsigned int resp_len;
u32 spu_hdr_len;
u32 db_size;
u32 stat_pad_len;
u32 pad_len;
struct brcm_message *mssg; /* mailbox message */
struct spu_request_opts req_opts;
struct spu_cipher_parms cipher_parms;
struct spu_hash_parms hash_parms;
struct spu_aead_parms aead_parms;
int assoc_nents = 0;
bool incl_icv = false;
unsigned int digestsize = ctx->digestsize;
/* number of entries in src and dst sg. Always includes SPU msg header.
*/
u8 rx_frag_num = 2; /* and STATUS */
u8 tx_frag_num = 1;
/* doing the whole thing at once */
chunksize = rctx->total_todo;
flow_log("%s: chunksize %u\n", __func__, chunksize);
memset(&req_opts, 0, sizeof(req_opts));
memset(&hash_parms, 0, sizeof(hash_parms));
memset(&aead_parms, 0, sizeof(aead_parms));
req_opts.is_inbound = !(rctx->is_encrypt);
req_opts.auth_first = ctx->auth_first;
req_opts.is_aead = true;
req_opts.is_esp = ctx->is_esp;
cipher_parms.alg = ctx->cipher.alg;
cipher_parms.mode = ctx->cipher.mode;
cipher_parms.type = ctx->cipher_type;
cipher_parms.key_buf = ctx->enckey;
cipher_parms.key_len = ctx->enckeylen;
cipher_parms.iv_buf = rctx->msg_buf.iv_ctr;
cipher_parms.iv_len = rctx->iv_ctr_len;
hash_parms.alg = ctx->auth.alg;
hash_parms.mode = ctx->auth.mode;
hash_parms.type = HASH_TYPE_NONE;
hash_parms.key_buf = (u8 *)ctx->authkey;
hash_parms.key_len = ctx->authkeylen;
hash_parms.digestsize = digestsize;
if ((ctx->auth.alg == HASH_ALG_SHA224) &&
(ctx->authkeylen < SHA224_DIGEST_SIZE))
hash_parms.key_len = SHA224_DIGEST_SIZE;
aead_parms.assoc_size = req->assoclen;
if (ctx->is_esp && !ctx->is_rfc4543) {
/*
* 8-byte IV is included assoc data in request. SPU2
* expects AAD to include just SPI and seqno. So
* subtract off the IV len.
*/
aead_parms.assoc_size -= GCM_RFC4106_IV_SIZE;
if (rctx->is_encrypt) {
aead_parms.return_iv = true;
aead_parms.ret_iv_len = GCM_RFC4106_IV_SIZE;
aead_parms.ret_iv_off = GCM_ESP_SALT_SIZE;
}
} else {
aead_parms.ret_iv_len = 0;
}
/*
* Count number of sg entries from the crypto API request that are to
* be included in this mailbox message. For dst sg, don't count space
* for digest. Digest gets caught in a separate buffer and copied back
* to dst sg when processing response.
*/
rctx->src_nents = spu_sg_count(rctx->src_sg, rctx->src_skip, chunksize);
rctx->dst_nents = spu_sg_count(rctx->dst_sg, rctx->dst_skip, chunksize);
if (aead_parms.assoc_size)
assoc_nents = spu_sg_count(rctx->assoc, 0,
aead_parms.assoc_size);
mssg = &rctx->mb_mssg;
rctx->total_sent = chunksize;
rctx->src_sent = chunksize;
if (spu->spu_assoc_resp_len(ctx->cipher.mode,
aead_parms.assoc_size,
aead_parms.ret_iv_len,
rctx->is_encrypt))
rx_frag_num++;
aead_parms.iv_len = spu->spu_aead_ivlen(ctx->cipher.mode,
rctx->iv_ctr_len);
if (ctx->auth.alg == HASH_ALG_AES)
hash_parms.type = (enum hash_type)ctx->cipher_type;
/* General case AAD padding (CCM and RFC4543 special cases below) */
aead_parms.aad_pad_len = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
aead_parms.assoc_size);
/* General case data padding (CCM decrypt special case below) */
aead_parms.data_pad_len = spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
chunksize);
if (ctx->cipher.mode == CIPHER_MODE_CCM) {
/*
* for CCM, AAD len + 2 (rather than AAD len) needs to be
* 128-bit aligned
*/
aead_parms.aad_pad_len = spu->spu_gcm_ccm_pad_len(
ctx->cipher.mode,
aead_parms.assoc_size + 2);
/*
* And when decrypting CCM, need to pad without including
* size of ICV which is tacked on to end of chunk
*/
if (!rctx->is_encrypt)
aead_parms.data_pad_len =
spu->spu_gcm_ccm_pad_len(ctx->cipher.mode,
chunksize - digestsize);
/* CCM also requires software to rewrite portions of IV: */
spu->spu_ccm_update_iv(digestsize, &cipher_parms, req->assoclen,
chunksize, rctx->is_encrypt,
ctx->is_esp);
}
if (ctx->is_rfc4543) {
/*
* RFC4543: data is included in AAD, so don't pad after AAD
* and pad data based on both AAD + data size
*/
aead_parms.aad_pad_len = 0;
if (!rctx->is_encrypt)
aead_parms.data_pad_len = spu->spu_gcm_ccm_pad_len(
ctx->cipher.mode,
aead_parms.assoc_size + chunksize -
digestsize);
else
aead_parms.data_pad_len = spu->spu_gcm_ccm_pad_len(
ctx->cipher.mode,
aead_parms.assoc_size + chunksize);
req_opts.is_rfc4543 = true;
}
if (spu_req_incl_icv(ctx->cipher.mode, rctx->is_encrypt)) {
incl_icv = true;
tx_frag_num++;
/* Copy ICV from end of src scatterlist to digest buf */
sg_copy_part_to_buf(req->src, rctx->msg_buf.digest, digestsize,
req->assoclen + rctx->total_sent -
digestsize);
}
atomic64_add(chunksize, &iproc_priv.bytes_out);
flow_log("%s()-sent chunksize:%u\n", __func__, chunksize);
/* Prepend SPU header with type 3 BCM header */
memcpy(rctx->msg_buf.bcm_spu_req_hdr, BCMHEADER, BCM_HDR_LEN);
spu_hdr_len = spu->spu_create_request(rctx->msg_buf.bcm_spu_req_hdr +
BCM_HDR_LEN, &req_opts,
&cipher_parms, &hash_parms,
&aead_parms, chunksize);
/* Determine total length of padding. Put all padding in one buffer. */
db_size = spu_real_db_size(aead_parms.assoc_size, aead_parms.iv_len, 0,
chunksize, aead_parms.aad_pad_len,
aead_parms.data_pad_len, 0);
stat_pad_len = spu->spu_wordalign_padlen(db_size);
if (stat_pad_len)
rx_frag_num++;
pad_len = aead_parms.data_pad_len + stat_pad_len;
if (pad_len) {
tx_frag_num++;
spu->spu_request_pad(rctx->msg_buf.spu_req_pad,
aead_parms.data_pad_len, 0,
ctx->auth.alg, ctx->auth.mode,
rctx->total_sent, stat_pad_len);
}
spu->spu_dump_msg_hdr(rctx->msg_buf.bcm_spu_req_hdr + BCM_HDR_LEN,
spu_hdr_len);
dump_sg(rctx->assoc, 0, aead_parms.assoc_size);
packet_dump(" aead iv: ", rctx->msg_buf.iv_ctr, aead_parms.iv_len);
packet_log("BD:\n");
dump_sg(rctx->src_sg, rctx->src_skip, chunksize);
packet_dump(" pad: ", rctx->msg_buf.spu_req_pad, pad_len);
/*
* Build mailbox message containing SPU request msg and rx buffers
* to catch response message
*/
memset(mssg, 0, sizeof(*mssg));
mssg->type = BRCM_MESSAGE_SPU;
mssg->ctx = rctx; /* Will be returned in response */
/* Create rx scatterlist to catch result */
rx_frag_num += rctx->dst_nents;
resp_len = chunksize;
/*
* Always catch ICV in separate buffer. Have to for GCM/CCM because of
* padding. Have to for SHA-224 and other truncated SHAs because SPU
* sends entire digest back.
*/
rx_frag_num++;
if (((ctx->cipher.mode == CIPHER_MODE_GCM) ||
(ctx->cipher.mode == CIPHER_MODE_CCM)) && !rctx->is_encrypt) {
/*
* Input is ciphertxt plus ICV, but ICV not incl
* in output.
*/
resp_len -= ctx->digestsize;
if (resp_len == 0)
/* no rx frags to catch output data */
rx_frag_num -= rctx->dst_nents;
}
err = spu_aead_rx_sg_create(mssg, req, rctx, rx_frag_num,
aead_parms.assoc_size,
aead_parms.ret_iv_len, resp_len, digestsize,
stat_pad_len);
if (err)
return err;
/* Create tx scatterlist containing SPU request message */
tx_frag_num += rctx->src_nents;
tx_frag_num += assoc_nents;
if (aead_parms.aad_pad_len)
tx_frag_num++;
if (aead_parms.iv_len)
tx_frag_num++;
if (spu->spu_tx_status_len())
tx_frag_num++;
err = spu_aead_tx_sg_create(mssg, rctx, tx_frag_num, spu_hdr_len,
rctx->assoc, aead_parms.assoc_size,
assoc_nents, aead_parms.iv_len, chunksize,
aead_parms.aad_pad_len, pad_len, incl_icv);
if (err)
return err;
err = mailbox_send_message(mssg, req->base.flags, rctx->chan_idx);
if (unlikely(err < 0))
return err;
return -EINPROGRESS;
}
/**
* handle_aead_resp() - Process a SPU response message for an AEAD request.
* @rctx: Crypto request context
*/
static void handle_aead_resp(struct iproc_reqctx_s *rctx)
{
struct spu_hw *spu = &iproc_priv.spu;
struct crypto_async_request *areq = rctx->parent;
struct aead_request *req = container_of(areq,
struct aead_request, base);
struct iproc_ctx_s *ctx = rctx->ctx;
u32 payload_len;
unsigned int icv_offset;
u32 result_len;
/* See how much data was returned */
payload_len = spu->spu_payload_length(rctx->msg_buf.spu_resp_hdr);
flow_log("payload_len %u\n", payload_len);
/* only count payload */
atomic64_add(payload_len, &iproc_priv.bytes_in);
if (req->assoclen)
packet_dump(" assoc_data ", rctx->msg_buf.a.resp_aad,
req->assoclen);
/*
* Copy the ICV back to the destination
* buffer. In decrypt case, SPU gives us back the digest, but crypto
* API doesn't expect ICV in dst buffer.
*/
result_len = req->cryptlen;
if (rctx->is_encrypt) {
icv_offset = req->assoclen + rctx->total_sent;
packet_dump(" ICV: ", rctx->msg_buf.digest, ctx->digestsize);
flow_log("copying ICV to dst sg at offset %u\n", icv_offset);
sg_copy_part_from_buf(req->dst, rctx->msg_buf.digest,
ctx->digestsize, icv_offset);
result_len += ctx->digestsize;
}
packet_log("response data: ");
dump_sg(req->dst, req->assoclen, result_len);
atomic_inc(&iproc_priv.op_counts[SPU_OP_AEAD]);
if (ctx->cipher.alg == CIPHER_ALG_AES) {
if (ctx->cipher.mode == CIPHER_MODE_CCM)
atomic_inc(&iproc_priv.aead_cnt[AES_CCM]);
else if (ctx->cipher.mode == CIPHER_MODE_GCM)
atomic_inc(&iproc_priv.aead_cnt[AES_GCM]);
else
atomic_inc(&iproc_priv.aead_cnt[AUTHENC]);
} else {
atomic_inc(&iproc_priv.aead_cnt[AUTHENC]);
}
}
/**
* spu_chunk_cleanup() - Do cleanup after processing one chunk of a request
* @rctx: request context
*
* Mailbox scatterlists are allocated for each chunk. So free them after
* processing each chunk.
*/
static void spu_chunk_cleanup(struct iproc_reqctx_s *rctx)
{
/* mailbox message used to tx request */
struct brcm_message *mssg = &rctx->mb_mssg;
kfree(mssg->spu.src);
kfree(mssg->spu.dst);
memset(mssg, 0, sizeof(struct brcm_message));
}
/**
* finish_req() - Used to invoke the complete callback from the requester when
* a request has been handled asynchronously.
* @rctx: Request context
* @err: Indicates whether the request was successful or not
*
* Ensures that cleanup has been done for request
*/
static void finish_req(struct iproc_reqctx_s *rctx, int err)
{
struct crypto_async_request *areq = rctx->parent;
flow_log("%s() err:%d\n\n", __func__, err);
/* No harm done if already called */
spu_chunk_cleanup(rctx);
if (areq)
crypto_request_complete(areq, err);
}
/**
* spu_rx_callback() - Callback from mailbox framework with a SPU response.
* @cl: mailbox client structure for SPU driver
* @msg: mailbox message containing SPU response
*/
static void spu_rx_callback(struct mbox_client *cl, void *msg)
{
struct spu_hw *spu = &iproc_priv.spu;
struct brcm_message *mssg = msg;
struct iproc_reqctx_s *rctx;
int err;
rctx = mssg->ctx;
if (unlikely(!rctx)) {
/* This is fatal */
pr_err("%s(): no request context", __func__);
err = -EFAULT;
goto cb_finish;
}
/* process the SPU status */
err = spu->spu_status_process(rctx->msg_buf.rx_stat);
if (err != 0) {
if (err == SPU_INVALID_ICV)
atomic_inc(&iproc_priv.bad_icv);
err = -EBADMSG;
goto cb_finish;
}
/* Process the SPU response message */
switch (rctx->ctx->alg->type) {
case CRYPTO_ALG_TYPE_SKCIPHER:
handle_skcipher_resp(rctx);
break;
case CRYPTO_ALG_TYPE_AHASH:
handle_ahash_resp(rctx);
break;
case CRYPTO_ALG_TYPE_AEAD:
handle_aead_resp(rctx);
break;
default:
err = -EINVAL;
goto cb_finish;
}
/*
* If this response does not complete the request, then send the next
* request chunk.
*/
if (rctx->total_sent < rctx->total_todo) {
/* Deallocate anything specific to previous chunk */
spu_chunk_cleanup(rctx);
switch (rctx->ctx->alg->type) {
case CRYPTO_ALG_TYPE_SKCIPHER:
err = handle_skcipher_req(rctx);
break;
case CRYPTO_ALG_TYPE_AHASH:
err = handle_ahash_req(rctx);
if (err == -EAGAIN)
/*
* we saved data in hash carry, but tell crypto
* API we successfully completed request.
*/
err = 0;
break;
case CRYPTO_ALG_TYPE_AEAD:
err = handle_aead_req(rctx);
break;
default:
err = -EINVAL;
}
if (err == -EINPROGRESS)
/* Successfully submitted request for next chunk */
return;
}
cb_finish:
finish_req(rctx, err);
}
/* ==================== Kernel Cryptographic API ==================== */
/**
* skcipher_enqueue() - Handle skcipher encrypt or decrypt request.
* @req: Crypto API request
* @encrypt: true if encrypting; false if decrypting
*
* Return: -EINPROGRESS if request accepted and result will be returned
* asynchronously
* < 0 if an error
*/
static int skcipher_enqueue(struct skcipher_request *req, bool encrypt)
{
struct iproc_reqctx_s *rctx = skcipher_request_ctx(req);
struct iproc_ctx_s *ctx =
crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
int err;
flow_log("%s() enc:%u\n", __func__, encrypt);
rctx->gfp = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG |
CRYPTO_TFM_REQ_MAY_SLEEP)) ? GFP_KERNEL : GFP_ATOMIC;
rctx->parent = &req->base;
rctx->is_encrypt = encrypt;
rctx->bd_suppress = false;
rctx->total_todo = req->cryptlen;
rctx->src_sent = 0;
rctx->total_sent = 0;
rctx->total_received = 0;
rctx->ctx = ctx;
/* Initialize current position in src and dst scatterlists */
rctx->src_sg = req->src;
rctx->src_nents = 0;
rctx->src_skip = 0;
rctx->dst_sg = req->dst;
rctx->dst_nents = 0;
rctx->dst_skip = 0;
if (ctx->cipher.mode == CIPHER_MODE_CBC ||
ctx->cipher.mode == CIPHER_MODE_CTR ||
ctx->cipher.mode == CIPHER_MODE_OFB ||
ctx->cipher.mode == CIPHER_MODE_XTS ||
ctx->cipher.mode == CIPHER_MODE_GCM ||
ctx->cipher.mode == CIPHER_MODE_CCM) {
rctx->iv_ctr_len =
crypto_skcipher_ivsize(crypto_skcipher_reqtfm(req));
memcpy(rctx->msg_buf.iv_ctr, req->iv, rctx->iv_ctr_len);
} else {
rctx->iv_ctr_len = 0;
}
/* Choose a SPU to process this request */
rctx->chan_idx = select_channel();
err = handle_skcipher_req(rctx);
if (err != -EINPROGRESS)
/* synchronous result */
spu_chunk_cleanup(rctx);
return err;
}
static int des_setkey(struct crypto_skcipher *cipher, const u8 *key,
unsigned int keylen)
{
struct iproc_ctx_s *ctx = crypto_skcipher_ctx(cipher);
int err;
err = verify_skcipher_des_key(cipher, key);
if (err)
return err;
ctx->cipher_type = CIPHER_TYPE_DES;
return 0;
}
static int threedes_setkey(struct crypto_skcipher *cipher, const u8 *key,
unsigned int keylen)
{
struct iproc_ctx_s *ctx = crypto_skcipher_ctx(cipher);
int err;
err = verify_skcipher_des3_key(cipher, key);
if (err)
return err;
ctx->cipher_type = CIPHER_TYPE_3DES;
return 0;
}
static int aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
unsigned int keylen)
{
struct iproc_ctx_s *ctx = crypto_skcipher_ctx(cipher);
if (ctx->cipher.mode == CIPHER_MODE_XTS)
/* XTS includes two keys of equal length */
keylen = keylen / 2;
switch (keylen) {
case AES_KEYSIZE_128:
ctx->cipher_type = CIPHER_TYPE_AES128;
break;
case AES_KEYSIZE_192:
ctx->cipher_type = CIPHER_TYPE_AES192;
break;
case AES_KEYSIZE_256:
ctx->cipher_type = CIPHER_TYPE_AES256;
break;
default:
return -EINVAL;
}
WARN_ON((ctx->max_payload != SPU_MAX_PAYLOAD_INF) &&
((ctx->max_payload % AES_BLOCK_SIZE) != 0));
return 0;
}
static int skcipher_setkey(struct crypto_skcipher *cipher, const u8 *key,
unsigned int keylen)
{
struct spu_hw *spu = &iproc_priv.spu;
struct iproc_ctx_s *ctx = crypto_skcipher_ctx(cipher);
struct spu_cipher_parms cipher_parms;
u32 alloc_len = 0;
int err;
flow_log("skcipher_setkey() keylen: %d\n", keylen);
flow_dump(" key: ", key, keylen);
switch (ctx->cipher.alg) {
case CIPHER_ALG_DES:
err = des_setkey(cipher, key, keylen);
break;
case CIPHER_ALG_3DES:
err = threedes_setkey(cipher, key, keylen);
break;
case CIPHER_ALG_AES:
err = aes_setkey(cipher, key, keylen);
break;
default:
pr_err("%s() Error: unknown cipher alg\n", __func__);
err = -EINVAL;
}
if (err)
return err;
memcpy(ctx->enckey, key, keylen);
ctx->enckeylen = keylen;
/* SPU needs XTS keys in the reverse order the crypto API presents */
if ((ctx->cipher.alg == CIPHER_ALG_AES) &&
(ctx->cipher.mode == CIPHER_MODE_XTS)) {
unsigned int xts_keylen = keylen / 2;
memcpy(ctx->enckey, key + xts_keylen, xts_keylen);
memcpy(ctx->enckey + xts_keylen, key, xts_keylen);
}
if (spu->spu_type == SPU_TYPE_SPUM)
alloc_len = BCM_HDR_LEN + SPU_HEADER_ALLOC_LEN;
else if (spu->spu_type == SPU_TYPE_SPU2)
alloc_len = BCM_HDR_LEN + SPU2_HEADER_ALLOC_LEN;
memset(ctx->bcm_spu_req_hdr, 0, alloc_len);
cipher_parms.iv_buf = NULL;
cipher_parms.iv_len = crypto_skcipher_ivsize(cipher);
flow_log("%s: iv_len %u\n", __func__, cipher_parms.iv_len);
cipher_parms.alg = ctx->cipher.alg;
cipher_parms.mode = ctx->cipher.mode;
cipher_parms.type = ctx->cipher_type;
cipher_parms.key_buf = ctx->enckey;
cipher_parms.key_len = ctx->enckeylen;
/* Prepend SPU request message with BCM header */
memcpy(ctx->bcm_spu_req_hdr, BCMHEADER, BCM_HDR_LEN);
ctx->spu_req_hdr_len =
spu->spu_cipher_req_init(ctx->bcm_spu_req_hdr + BCM_HDR_LEN,
&cipher_parms);
ctx->spu_resp_hdr_len = spu->spu_response_hdr_len(ctx->authkeylen,
ctx->enckeylen,
false);
atomic_inc(&iproc_priv.setkey_cnt[SPU_OP_CIPHER]);
return 0;
}
static int skcipher_encrypt(struct skcipher_request *req)
{
flow_log("skcipher_encrypt() nbytes:%u\n", req->cryptlen);
return skcipher_enqueue(req, true);
}
static int skcipher_decrypt(struct skcipher_request *req)
{
flow_log("skcipher_decrypt() nbytes:%u\n", req->cryptlen);
return skcipher_enqueue(req, false);
}
static int ahash_enqueue(struct ahash_request *req)
{
struct iproc_reqctx_s *rctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct iproc_ctx_s *ctx = crypto_ahash_ctx(tfm);
int err;
const char *alg_name;
flow_log("ahash_enqueue() nbytes:%u\n", req->nbytes);
rctx->gfp = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG |
CRYPTO_TFM_REQ_MAY_SLEEP)) ? GFP_KERNEL : GFP_ATOMIC;
rctx->parent = &req->base;
rctx->ctx = ctx;
rctx->bd_suppress = true;
memset(&rctx->mb_mssg, 0, sizeof(struct brcm_message));
/* Initialize position in src scatterlist */
rctx->src_sg = req->src;
rctx->src_skip = 0;
rctx->src_nents = 0;
rctx->dst_sg = NULL;
rctx->dst_skip = 0;
rctx->dst_nents = 0;
/* SPU2 hardware does not compute hash of zero length data */
if ((rctx->is_final == 1) && (rctx->total_todo == 0) &&
(iproc_priv.spu.spu_type == SPU_TYPE_SPU2)) {
alg_name = crypto_ahash_alg_name(tfm);
flow_log("Doing %sfinal %s zero-len hash request in software\n",
rctx->is_final ? "" : "non-", alg_name);
err = do_shash((unsigned char *)alg_name, req->result,
NULL, 0, NULL, 0, ctx->authkey,
ctx->authkeylen);
if (err < 0)
flow_log("Hash request failed with error %d\n", err);
return err;
}
/* Choose a SPU to process this request */
rctx->chan_idx = select_channel();
err = handle_ahash_req(rctx);
if (err != -EINPROGRESS)
/* synchronous result */
spu_chunk_cleanup(rctx);
if (err == -EAGAIN)
/*
* we saved data in hash carry, but tell crypto API
* we successfully completed request.
*/
err = 0;
return err;
}
static int __ahash_init(struct ahash_request *req)
{
struct spu_hw *spu = &iproc_priv.spu;
struct iproc_reqctx_s *rctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
struct iproc_ctx_s *ctx = crypto_ahash_ctx(tfm);
flow_log("%s()\n", __func__);
/* Initialize the context */
rctx->hash_carry_len = 0;
rctx->is_final = 0;
rctx->total_todo = 0;
rctx->src_sent = 0;
rctx->total_sent = 0;
rctx->total_received = 0;
ctx->digestsize = crypto_ahash_digestsize(tfm);
/* If we add a hash whose digest is larger, catch it here. */
WARN_ON(ctx->digestsize > MAX_DIGEST_SIZE);
rctx->is_sw_hmac = false;
ctx->spu_resp_hdr_len = spu->spu_response_hdr_len(ctx->authkeylen, 0,
true);
return 0;
}
/**
* spu_no_incr_hash() - Determine whether incremental hashing is supported.
* @ctx: Crypto session context
*
* SPU-2 does not support incremental hashing (we'll have to revisit and
* condition based on chip revision or device tree entry if future versions do
* support incremental hash)
*
* SPU-M also doesn't support incremental hashing of AES-XCBC
*
* Return: true if incremental hashing is not supported
* false otherwise
*/
static bool spu_no_incr_hash(struct iproc_ctx_s *ctx)