netdev - Re: [PATCH 8/17] tls: Only use data field in crypto completion function

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Date:   Mon, 6 Feb 2023 23:15:21 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Herbert Xu" <herbert@...dor.apana.org.au>
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: Re: [PATCH 8/17] tls: Only use data field in crypto completion
 function

On Mon, 06 Feb 2023 18:22:27 +0800 Herbert Xu wrote:
> -static void tls_encrypt_done(struct crypto_async_request *req, int err)
> +static void tls_encrypt_done(crypto_completion_data_t *data, int err)
>  {
> -	struct aead_request *aead_req = (struct aead_request *)req;
> -	struct sock *sk = req->data;
> -	struct tls_context *tls_ctx = tls_get_ctx(sk);
> -	struct tls_prot_info *prot = &tls_ctx->prot_info;
> -	struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
> +	struct aead_request *aead_req = crypto_get_completion_data(data);

All we use aead_req for in this function now is to find rec...

> +	struct tls_sw_context_tx *ctx;
> +	struct tls_context *tls_ctx;
> +	struct tls_prot_info *prot;
>  	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;
> +	tls_ctx = tls_get_ctx(sk);
> +	prot = &tls_ctx->prot_info;
> +	ctx = tls_sw_ctx_tx(tls_ctx);
> +
>  	sge = sk_msg_elem(msg_en, msg_en->sg.curr);
>  	sge->offset -= prot->prepend_size;
>  	sge->length += prot->prepend_size;
> @@ -520,7 +536,7 @@ 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, sk);
> +				  tls_encrypt_done, aead_req);

... let's just pass rec instead of aead_req here, then?

>  	/* Add the record in tx_list */
>  	list_add_tail((struct list_head *)&rec->list, &ctx->tx_list);