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crypto: talitos - ensure request ordering within a single tfm 

Assign single target channel per tfm in talitos_cra_init instead of
performing channel scheduling dynamically during the encryption request.
This changes the talitos_submit interface to accept a new channel
number argument.  Without this, rapid bursts of misc. sized requests
could make it possible for IPsec packets to be encrypted out-of-order,
which would result in packet drops due to sequence numbers falling
outside the anti-reply window on a peer gateway.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kim Phillips 2011-07-15 11:21:38 +08:00 committed by Herbert Xu
parent 625426633d
commit 5228f0f79e
1 changed files with 14 additions and 9 deletions
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23
drivers/crypto/talitos.c
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@ -1,7 +1,7 @@
/*
* talitos - Freescale Integrated Security Engine (SEC) device driver
*
* Copyright (c) 2008-2010 Freescale Semiconductor, Inc.
* Copyright (c) 2008-2011 Freescale Semiconductor, Inc.
*
* Scatterlist Crypto API glue code copied from files with the following:
* Copyright (c) 2006-2007 Herbert Xu <herbert@gondor.apana.org.au>
@ -282,6 +282,7 @@ static int init_device(struct device *dev)
/**
* talitos_submit - submits a descriptor to the device for processing
* @dev: the SEC device to be used
* @ch: the SEC device channel to be used
* @desc: the descriptor to be processed by the device
* @callback: whom to call when processing is complete
* @context: a handle for use by caller (optional)
@ -290,7 +291,7 @@ static int init_device(struct device *dev)
* callback must check err and feedback in descriptor header
* for device processing status.
*/
static int talitos_submit(struct device *dev, struct talitos_desc *desc,
static int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
void (*callback)(struct device *dev,
struct talitos_desc *desc,
void *context, int error),
@ -298,15 +299,12 @@ static int talitos_submit(struct device *dev, struct talitos_desc *desc,
{
struct talitos_private *priv = dev_get_drvdata(dev);
struct talitos_request *request;
unsigned long flags, ch;
unsigned long flags;
int head;
/* select done notification */
desc->hdr |= DESC_HDR_DONE_NOTIFY;
/* emulate SEC's round-robin channel fifo polling scheme */
ch = atomic_inc_return(&priv->last_chan) & (priv->num_channels - 1);
spin_lock_irqsave(&priv->chan[ch].head_lock, flags);
if (!atomic_inc_not_zero(&priv->chan[ch].submit_count)) {
@ -706,6 +704,7 @@ static void talitos_unregister_rng(struct device *dev)
struct talitos_ctx {
struct device *dev;
int ch;
__be32 desc_hdr_template;
u8 key[TALITOS_MAX_KEY_SIZE];
u8 iv[TALITOS_MAX_IV_LENGTH];
@ -1117,7 +1116,7 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
map_single_talitos_ptr(dev, &desc->ptr[6], ivsize, ctx->iv, 0,
DMA_FROM_DEVICE);
ret = talitos_submit(dev, desc, callback, areq);
ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
if (ret != -EINPROGRESS) {
ipsec_esp_unmap(dev, edesc, areq);
kfree(edesc);
@ -1524,7 +1523,7 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
to_talitos_ptr(&desc->ptr[6], 0);
desc->ptr[6].j_extent = 0;
ret = talitos_submit(dev, desc, callback, areq);
ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
if (ret != -EINPROGRESS) {
common_nonsnoop_unmap(dev, edesc, areq);
kfree(edesc);
@ -1703,7 +1702,7 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
/* last DWORD empty */
desc->ptr[6] = zero_entry;
ret = talitos_submit(dev, desc, callback, areq);
ret = talitos_submit(dev, ctx->ch, desc, callback, areq);
if (ret != -EINPROGRESS) {
common_nonsnoop_hash_unmap(dev, edesc, areq);
kfree(edesc);
@ -2244,6 +2243,7 @@ static int talitos_cra_init(struct crypto_tfm *tfm)
struct crypto_alg *alg = tfm->__crt_alg;
struct talitos_crypto_alg *talitos_alg;
struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);
struct talitos_private *priv;
if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_AHASH)
talitos_alg = container_of(__crypto_ahash_alg(alg),
@ -2256,6 +2256,11 @@ static int talitos_cra_init(struct crypto_tfm *tfm)
/* update context with ptr to dev */
ctx->dev = talitos_alg->dev;
/* assign SEC channel to tfm in round-robin fashion */
priv = dev_get_drvdata(ctx->dev);
ctx->ch = atomic_inc_return(&priv->last_chan) &
(priv->num_channels - 1);
/* copy descriptor header template value */
ctx->desc_hdr_template = talitos_alg->algt.desc_hdr_template;