diff mbox series

[1/4] net/tls: handle MSG_EOR for tls_sw TX flow

Message ID 20230609125153.3919-2-hare@suse.de (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series net/tls: fixes for NVMe-over-TLS | expand

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Context Check Description
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Hannes Reinecke June 9, 2023, 12:51 p.m. UTC
tls_sw_sendmsg() / tls_do_sw_sendpage() already handles
MSG_MORE / MSG_SENDPAGE_NOTLAST, but bails out on MSG_EOR.
But seeing that MSG_EOR is basically the opposite of
MSG_MORE / MSG_SENDPAGE_NOTLAST this patch adds handling
MSG_EOR by treating it as the negation of MSG_MORE.

Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 net/tls/tls_sw.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Sabrina Dubroca June 9, 2023, 4:37 p.m. UTC | #1
Hi Hannes,

2023-06-09, 14:51:50 +0200, Hannes Reinecke wrote:
> tls_sw_sendmsg() / tls_do_sw_sendpage() already handles
> MSG_MORE / MSG_SENDPAGE_NOTLAST, but bails out on MSG_EOR.
> But seeing that MSG_EOR is basically the opposite of
> MSG_MORE / MSG_SENDPAGE_NOTLAST this patch adds handling
> MSG_EOR by treating it as the negation of MSG_MORE.
> 
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: netdev@vger.kernel.org
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> ---
>  net/tls/tls_sw.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
> index 635b8bf6b937..be8e0459d403 100644
> --- a/net/tls/tls_sw.c
> +++ b/net/tls/tls_sw.c
> @@ -953,9 +953,12 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
>  	int pending;
>  
>  	if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
> -			       MSG_CMSG_COMPAT))
> +			       MSG_EOR | MSG_CMSG_COMPAT))
>  		return -EOPNOTSUPP;
>  
> +	if (msg->msg_flags & MSG_EOR)
> +		eor = true;

Is MSG_EOR supposed to be incompatible with MSG_MORE, or is it
supposed to cancel it? (ie: MSG_MORE | MSG_EOR is invalid, or
MSG_MORE | MSG_EOR behaves like MSG_EOR) The current code already
behaves as if _EOR was passed as long as MSG_MORE isn't passed, so
_EOR is only needed to cancel out _MORE (or in your case, because
NVMe-over-TLS sets it).

If _EOR and _MORE (or MSG_SENDPAGE_NOTLAST below) are supposed to be
incompatible, we should return an error when they're both set. If we
accept both flags being set at the same time, I think we should
document the expected behavior ("_EOR overrides _MORE/_NOTLAST") and
add specific selftests to avoid regressions.
diff mbox series

Patch

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 635b8bf6b937..be8e0459d403 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -953,9 +953,12 @@  int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 	int pending;
 
 	if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
-			       MSG_CMSG_COMPAT))
+			       MSG_EOR | MSG_CMSG_COMPAT))
 		return -EOPNOTSUPP;
 
+	if (msg->msg_flags & MSG_EOR)
+		eor = true;
+
 	ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
 	if (ret)
 		return ret;
@@ -1173,6 +1176,8 @@  static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
 	bool eor;
 
 	eor = !(flags & MSG_SENDPAGE_NOTLAST);
+	if (flags & MSG_EOR)
+		eor = true;
 	sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 
 	/* Call the sk_stream functions to manage the sndbuf mem. */
@@ -1274,7 +1279,7 @@  static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
 			   int offset, size_t size, int flags)
 {
-	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
+	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_EOR |
 		      MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY |
 		      MSG_NO_SHARED_FRAGS))
 		return -EOPNOTSUPP;
@@ -1288,7 +1293,7 @@  int tls_sw_sendpage(struct sock *sk, struct page *page,
 	struct tls_context *tls_ctx = tls_get_ctx(sk);
 	int ret;
 
-	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
+	if (flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_EOR |
 		      MSG_SENDPAGE_NOTLAST | MSG_SENDPAGE_NOPOLICY))
 		return -EOPNOTSUPP;