netdev - [PATCH] tls: Pass rec instead of aead_req into tls_encrypt

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Message-ID: <Y+IJXEYPuaQWjfR5@gondor.apana.org.au>
Date:   Tue, 7 Feb 2023 16:18:36 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Tyler Hicks <code@...icks.com>, ecryptfs@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Jon Maloy <jmaloy@...hat.com>,
        Ying Xue <ying.xue@...driver.com>,
        Boris Pismenny <borisp@...dia.com>,
        John Fastabend <john.fastabend@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>, keyrings@...r.kernel.org
Subject: [PATCH] tls: Pass rec instead of aead_req into tls_encrypt_done

On Mon, Feb 06, 2023 at 11:15:21PM -0800, Jakub Kicinski wrote:
>
> >  	aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
> > -				  tls_encrypt_done, sk);
> > +				  tls_encrypt_done, aead_req);
> 
> ... let's just pass rec instead of aead_req here, then?

Good point.  Could we do this as a follow-up patch? Reposting
the whole series would disturb a lot of people.  Of course if
other major issues crop up I can fold this into the existing
patch.

Thanks!

---8<---
The function tls_encrypt_done only uses aead_req to get ahold of
the tls_rec object.  So we could pass that in instead of aead_req
to simplify the code.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 0515cda32fe2..6dfec2e8fdfa 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -430,18 +430,16 @@ int tls_tx_records(struct sock *sk, int flags)
 
 static void tls_encrypt_done(void *data, int err)
 {
-	struct aead_request *aead_req = data;
 	struct tls_sw_context_tx *ctx;
 	struct tls_context *tls_ctx;
 	struct tls_prot_info *prot;
+	struct tls_rec *rec = data;
 	struct scatterlist *sge;
 	struct sk_msg *msg_en;
-	struct tls_rec *rec;
 	bool ready = false;
 	struct sock *sk;
 	int pending;
 
-	rec = container_of(aead_req, struct tls_rec, aead_req);
 	msg_en = &rec->msg_encrypted;
 
 	sk = rec->sk;
@@ -536,7 +534,7 @@ static int tls_do_encryption(struct sock *sk,
 			       data_len, rec->iv_data);
 
 	aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
-				  tls_encrypt_done, aead_req);
+				  tls_encrypt_done, rec);
 
 	/* Add the record in tx_list */
 	list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt