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net: tls: handle backlogging of crypto requests

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Since we're setting the CRYPTO_TFM_REQ_MAY_BACKLOG flag on our
requests to the crypto API, crypto_aead_{encrypt,decrypt} can return
 -EBUSY instead of -EINPROGRESS in valid situations. For example, when
the cryptd queue for AESNI is full (easy to trigger with an
artificially low cryptd.cryptd_max_cpu_qlen), requests will be enqueued
to the backlog but still processed. In that case, the async callback
will also be called twice: first with err == -EINPROGRESS, which it
seems we can just ignore, then with err == 0.

Compared to Sabrina's original patch this version uses the new
tls_*crypt_async_wait() helpers and converts the EBUSY to
EINPROGRESS to avoid having to modify all the error handling
paths. The handling is identical.

Fixes: a54667f672 ("tls: Add support for encryption using async offload accelerator")
Fixes: 94524d8fc9 ("net/tls: Add support for async decryption of tls records")
Co-developed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/netdev/9681d1febfec295449a62300938ed2ae66983f28.1694018970.git.sd@queasysnail.net/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2024-02-06 17:18:21 -08:00 committed by David S. Miller
parent e01e3934a1
commit 8590541473
1 changed files with 22 additions and 0 deletions
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22
net/tls/tls_sw.c
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@ -196,6 +196,17 @@ static void tls_decrypt_done(void *data, int err)
struct sock *sk;
int aead_size;
/* If requests get too backlogged crypto API returns -EBUSY and calls
* ->complete(-EINPROGRESS) immediately followed by ->complete(0)
* to make waiting for backlog to flush with crypto_wait_req() easier.
* First wait converts -EBUSY -> -EINPROGRESS, and the second one
* -EINPROGRESS -> 0.
* We have a single struct crypto_async_request per direction, this
* scheme doesn't help us, so just ignore the first ->complete().
*/
if (err == -EINPROGRESS)
return;
aead_size = sizeof(*aead_req) + crypto_aead_reqsize(aead);
aead_size = ALIGN(aead_size, __alignof__(*dctx));
dctx = (void *)((u8 *)aead_req + aead_size);
@ -269,6 +280,10 @@ static int tls_do_decryption(struct sock *sk,
}
ret = crypto_aead_decrypt(aead_req);
if (ret == -EBUSY) {
ret = tls_decrypt_async_wait(ctx);
ret = ret ?: -EINPROGRESS;
}
if (ret == -EINPROGRESS) {
if (darg->async)
return 0;
@ -449,6 +464,9 @@ static void tls_encrypt_done(void *data, int err)
struct sk_msg *msg_en;
struct sock *sk;
if (err == -EINPROGRESS) /* see the comment in tls_decrypt_done() */
return;
msg_en = &rec->msg_encrypted;
sk = rec->sk;
@ -553,6 +571,10 @@ static int tls_do_encryption(struct sock *sk,
atomic_inc(&ctx->encrypt_pending);
rc = crypto_aead_encrypt(aead_req);
if (rc == -EBUSY) {
rc = tls_encrypt_async_wait(ctx);
rc = rc ?: -EINPROGRESS;
}
if (!rc || rc != -EINPROGRESS) {
atomic_dec(&ctx->encrypt_pending);
sge->offset -= prot->prepend_size;