[PATCH v4 08/19] crypto: move drbg to generic async completion
From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: 2017-08-08 12:03:39
Also in:
linux-raid
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
Possibly related (same subject, not in this thread)
- 2017-08-08 · [PATCH v4 08/19] crypto: move drbg to generic async completion · Gilad Ben-Yossef <hidden>
DRBG is starting an async. crypto op and waiting for it complete. Move it over to generic code doing the same. The code now also passes CRYPTO_TFM_REQ_MAY_SLEEP flag indicating crypto request memory allocation may use GFP_KERNEL which should be perfectly fine as the code is obviously sleeping for the completion of the request any way. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> --- crypto/drbg.c | 36 +++++++++--------------------------- include/crypto/drbg.h | 3 +-- 2 files changed, 10 insertions(+), 29 deletions(-)
diff --git a/crypto/drbg.c b/crypto/drbg.c
index 633a88e..c522251 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c@@ -1651,16 +1651,6 @@ static int drbg_fini_sym_kernel(struct drbg_state *drbg) return 0; } -static void drbg_skcipher_cb(struct crypto_async_request *req, int error) -{ - struct drbg_state *drbg = req->data; - - if (error == -EINPROGRESS) - return; - drbg->ctr_async_err = error; - complete(&drbg->ctr_completion); -} - static int drbg_init_sym_kernel(struct drbg_state *drbg) { struct crypto_cipher *tfm;
@@ -1691,7 +1681,7 @@ static int drbg_init_sym_kernel(struct drbg_state *drbg) return PTR_ERR(sk_tfm); } drbg->ctr_handle = sk_tfm; - init_completion(&drbg->ctr_completion); + crypto_init_wait(&drbg->ctr_wait); req = skcipher_request_alloc(sk_tfm, GFP_KERNEL); if (!req) {
@@ -1700,8 +1690,9 @@ static int drbg_init_sym_kernel(struct drbg_state *drbg) return -ENOMEM; } drbg->ctr_req = req; - skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, - drbg_skcipher_cb, drbg); + skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG | + CRYPTO_TFM_REQ_MAY_SLEEP, + crypto_req_done, &drbg->ctr_wait); alignmask = crypto_skcipher_alignmask(sk_tfm); drbg->ctr_null_value_buf = kzalloc(DRBG_CTR_NULL_LEN + alignmask,
@@ -1762,21 +1753,12 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg, /* Output buffer may not be valid for SGL, use scratchpad */ skcipher_request_set_crypt(drbg->ctr_req, &sg_in, &sg_out, cryptlen, drbg->V); - ret = crypto_skcipher_encrypt(drbg->ctr_req); - switch (ret) { - case 0: - break; - case -EINPROGRESS: - case -EBUSY: - wait_for_completion(&drbg->ctr_completion); - if (!drbg->ctr_async_err) { - reinit_completion(&drbg->ctr_completion); - break; - } - default: + ret = crypto_wait_req(crypto_skcipher_encrypt(drbg->ctr_req), + &drbg->ctr_wait); + if (ret) goto out; - } - init_completion(&drbg->ctr_completion); + + crypto_init_wait(&drbg->ctr_wait); memcpy(outbuf, drbg->outscratchpad, cryptlen);
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 22f884c..8f94110 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h@@ -126,8 +126,7 @@ struct drbg_state { __u8 *ctr_null_value; /* CTR mode aligned zero buf */ __u8 *outscratchpadbuf; /* CTR mode output scratchpad */ __u8 *outscratchpad; /* CTR mode aligned outbuf */ - struct completion ctr_completion; /* CTR mode async handler */ - int ctr_async_err; /* CTR mode async error */ + struct crypto_wait ctr_wait; /* CTR mode async wait obj */ bool seeded; /* DRBG fully seeded? */ bool pr; /* Prediction resistance enabled? */
--
2.1.4