crypto: cryptd - Add helpers to check whether a tfm is queued
This patch adds helpers to check whether a given tfm is currently
queued. This is meant to be used by ablk_helper and similar
entities to ensure that no reordering is introduced because of
requests queued in cryptd with respect to requests being processed
in softirq context.
The per-cpu queue length limit is also increased to 1000 in line
with network limits.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/cryptd.c b/crypto/cryptd.c
index 7921251..cf8037a8 100644
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -22,6 +22,7 @@
#include <crypto/internal/aead.h>
#include <crypto/cryptd.h>
#include <crypto/crypto_wq.h>
+#include <linux/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -31,7 +32,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
-#define CRYPTD_MAX_CPU_QLEN 100
+#define CRYPTD_MAX_CPU_QLEN 1000
struct cryptd_cpu_queue {
struct crypto_queue queue;
@@ -58,6 +59,7 @@
};
struct cryptd_blkcipher_ctx {
+ atomic_t refcnt;
struct crypto_blkcipher *child;
};
@@ -66,6 +68,7 @@
};
struct cryptd_hash_ctx {
+ atomic_t refcnt;
struct crypto_shash *child;
};
@@ -75,6 +78,7 @@
};
struct cryptd_aead_ctx {
+ atomic_t refcnt;
struct crypto_aead *child;
};
@@ -118,11 +122,29 @@
{
int cpu, err;
struct cryptd_cpu_queue *cpu_queue;
+ struct crypto_tfm *tfm;
+ atomic_t *refcnt;
+ bool may_backlog;
cpu = get_cpu();
cpu_queue = this_cpu_ptr(queue->cpu_queue);
err = crypto_enqueue_request(&cpu_queue->queue, request);
+
+ refcnt = crypto_tfm_ctx(request->tfm);
+ may_backlog = request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG;
+
+ if (err == -EBUSY && !may_backlog)
+ goto out_put_cpu;
+
queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
+
+ if (!atomic_read(refcnt))
+ goto out_put_cpu;
+
+ tfm = request->tfm;
+ atomic_inc(refcnt);
+
+out_put_cpu:
put_cpu();
return err;
@@ -206,7 +228,10 @@
unsigned int len))
{
struct cryptd_blkcipher_request_ctx *rctx;
+ struct cryptd_blkcipher_ctx *ctx;
+ struct crypto_ablkcipher *tfm;
struct blkcipher_desc desc;
+ int refcnt;
rctx = ablkcipher_request_ctx(req);
@@ -222,9 +247,16 @@
req->base.complete = rctx->complete;
out:
+ tfm = crypto_ablkcipher_reqtfm(req);
+ ctx = crypto_ablkcipher_ctx(tfm);
+ refcnt = atomic_read(&ctx->refcnt);
+
local_bh_disable();
rctx->complete(&req->base, err);
local_bh_enable();
+
+ if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_ablkcipher(tfm);
}
static void cryptd_blkcipher_encrypt(struct crypto_async_request *req, int err)
@@ -456,6 +488,21 @@
return cryptd_enqueue_request(queue, &req->base);
}
+static void cryptd_hash_complete(struct ahash_request *req, int err)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
+ struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+ int refcnt = atomic_read(&ctx->refcnt);
+
+ local_bh_disable();
+ rctx->complete(&req->base, err);
+ local_bh_enable();
+
+ if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_ahash(tfm);
+}
+
static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
{
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
@@ -475,9 +522,7 @@
req->base.complete = rctx->complete;
out:
- local_bh_disable();
- rctx->complete(&req->base, err);
- local_bh_enable();
+ cryptd_hash_complete(req, err);
}
static int cryptd_hash_init_enqueue(struct ahash_request *req)
@@ -500,9 +545,7 @@
req->base.complete = rctx->complete;
out:
- local_bh_disable();
- rctx->complete(&req->base, err);
- local_bh_enable();
+ cryptd_hash_complete(req, err);
}
static int cryptd_hash_update_enqueue(struct ahash_request *req)
@@ -523,9 +566,7 @@
req->base.complete = rctx->complete;
out:
- local_bh_disable();
- rctx->complete(&req->base, err);
- local_bh_enable();
+ cryptd_hash_complete(req, err);
}
static int cryptd_hash_final_enqueue(struct ahash_request *req)
@@ -546,9 +587,7 @@
req->base.complete = rctx->complete;
out:
- local_bh_disable();
- rctx->complete(&req->base, err);
- local_bh_enable();
+ cryptd_hash_complete(req, err);
}
static int cryptd_hash_finup_enqueue(struct ahash_request *req)
@@ -575,9 +614,7 @@
req->base.complete = rctx->complete;
out:
- local_bh_disable();
- rctx->complete(&req->base, err);
- local_bh_enable();
+ cryptd_hash_complete(req, err);
}
static int cryptd_hash_digest_enqueue(struct ahash_request *req)
@@ -688,7 +725,10 @@
int (*crypt)(struct aead_request *req))
{
struct cryptd_aead_request_ctx *rctx;
+ struct cryptd_aead_ctx *ctx;
crypto_completion_t compl;
+ struct crypto_aead *tfm;
+ int refcnt;
rctx = aead_request_ctx(req);
compl = rctx->complete;
@@ -697,10 +737,18 @@
goto out;
aead_request_set_tfm(req, child);
err = crypt( req );
+
out:
+ tfm = crypto_aead_reqtfm(req);
+ ctx = crypto_aead_ctx(tfm);
+ refcnt = atomic_read(&ctx->refcnt);
+
local_bh_disable();
compl(&req->base, err);
local_bh_enable();
+
+ if (err != -EINPROGRESS && refcnt && atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_aead(tfm);
}
static void cryptd_aead_encrypt(struct crypto_async_request *areq, int err)
@@ -883,6 +931,7 @@
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+ struct cryptd_blkcipher_ctx *ctx;
struct crypto_tfm *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
@@ -899,6 +948,9 @@
return ERR_PTR(-EINVAL);
}
+ ctx = crypto_tfm_ctx(tfm);
+ atomic_set(&ctx->refcnt, 1);
+
return __cryptd_ablkcipher_cast(__crypto_ablkcipher_cast(tfm));
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
@@ -910,9 +962,20 @@
}
EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
+bool cryptd_ablkcipher_queued(struct cryptd_ablkcipher *tfm)
+{
+ struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
+
+ return atomic_read(&ctx->refcnt) - 1;
+}
+EXPORT_SYMBOL_GPL(cryptd_ablkcipher_queued);
+
void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
{
- crypto_free_ablkcipher(&tfm->base);
+ struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
+
+ if (atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_ablkcipher(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
@@ -920,6 +983,7 @@
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+ struct cryptd_hash_ctx *ctx;
struct crypto_ahash *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
@@ -933,6 +997,9 @@
return ERR_PTR(-EINVAL);
}
+ ctx = crypto_ahash_ctx(tfm);
+ atomic_set(&ctx->refcnt, 1);
+
return __cryptd_ahash_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);
@@ -952,9 +1019,20 @@
}
EXPORT_SYMBOL_GPL(cryptd_shash_desc);
+bool cryptd_ahash_queued(struct cryptd_ahash *tfm)
+{
+ struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
+
+ return atomic_read(&ctx->refcnt) - 1;
+}
+EXPORT_SYMBOL_GPL(cryptd_ahash_queued);
+
void cryptd_free_ahash(struct cryptd_ahash *tfm)
{
- crypto_free_ahash(&tfm->base);
+ struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
+
+ if (atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_ahash(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_ahash);
@@ -962,6 +1040,7 @@
u32 type, u32 mask)
{
char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+ struct cryptd_aead_ctx *ctx;
struct crypto_aead *tfm;
if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
@@ -974,6 +1053,10 @@
crypto_free_aead(tfm);
return ERR_PTR(-EINVAL);
}
+
+ ctx = crypto_aead_ctx(tfm);
+ atomic_set(&ctx->refcnt, 1);
+
return __cryptd_aead_cast(tfm);
}
EXPORT_SYMBOL_GPL(cryptd_alloc_aead);
@@ -986,9 +1069,20 @@
}
EXPORT_SYMBOL_GPL(cryptd_aead_child);
+bool cryptd_aead_queued(struct cryptd_aead *tfm)
+{
+ struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
+
+ return atomic_read(&ctx->refcnt) - 1;
+}
+EXPORT_SYMBOL_GPL(cryptd_aead_queued);
+
void cryptd_free_aead(struct cryptd_aead *tfm)
{
- crypto_free_aead(&tfm->base);
+ struct cryptd_aead_ctx *ctx = crypto_aead_ctx(&tfm->base);
+
+ if (atomic_dec_and_test(&ctx->refcnt))
+ crypto_free_aead(&tfm->base);
}
EXPORT_SYMBOL_GPL(cryptd_free_aead);
diff --git a/include/crypto/cryptd.h b/include/crypto/cryptd.h
index 1547f54..bc792d5 100644
--- a/include/crypto/cryptd.h
+++ b/include/crypto/cryptd.h
@@ -31,6 +31,7 @@
struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
u32 type, u32 mask);
struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm);
+bool cryptd_ablkcipher_queued(struct cryptd_ablkcipher *tfm);
void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);
struct cryptd_ahash {
@@ -48,6 +49,8 @@
u32 type, u32 mask);
struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm);
struct shash_desc *cryptd_shash_desc(struct ahash_request *req);
+/* Must be called without moving CPUs. */
+bool cryptd_ahash_queued(struct cryptd_ahash *tfm);
void cryptd_free_ahash(struct cryptd_ahash *tfm);
struct cryptd_aead {
@@ -64,6 +67,8 @@
u32 type, u32 mask);
struct crypto_aead *cryptd_aead_child(struct cryptd_aead *tfm);
+/* Must be called without moving CPUs. */
+bool cryptd_aead_queued(struct cryptd_aead *tfm);
void cryptd_free_aead(struct cryptd_aead *tfm);