netdev - [net-next 10/15] net/tls: Perform immediate device ctx cleanup when possible

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Message-Id: <20220706232421.41269-11-saeed@kernel.org>
Date:   Wed,  6 Jul 2022 16:24:16 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Subject: [net-next 10/15] net/tls: Perform immediate device ctx cleanup when possible

From: Tariq Toukan <tariqt@...dia.com>

TLS context destructor can be run in atomic context. Cleanup operations
for device-offloaded contexts could require access and interaction with
the device callbacks, which might sleep. Hence, the cleanup of such
contexts must be deferred and completed inside an async work.

For all others, this is not necessary, as cleanup is atomic. Invoke
cleanup immediately for them, avoiding queueuing redundant gc work.

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 net/tls/tls_device.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index ec6f4b699a2b..2c004ce46887 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -95,16 +95,24 @@ static void tls_device_gc_task(struct work_struct *work)
 static void tls_device_queue_ctx_destruction(struct tls_context *ctx)
 {
 	unsigned long flags;
+	bool async_cleanup;
 
 	spin_lock_irqsave(&tls_device_lock, flags);
-	list_move_tail(&ctx->list, &tls_device_gc_list);
-
-	/* schedule_work inside the spinlock
-	 * to make sure tls_device_down waits for that work.
-	 */
-	schedule_work(&tls_device_gc_work);
+	async_cleanup = ctx->netdev && ctx->tx_conf == TLS_HW;
+	if (async_cleanup) {
+		list_move_tail(&ctx->list, &tls_device_gc_list);
 
+		/* schedule_work inside the spinlock
+		 * to make sure tls_device_down waits for that work.
+		 */
+		schedule_work(&tls_device_gc_work);
+	} else {
+		list_del(&ctx->list);
+	}
 	spin_unlock_irqrestore(&tls_device_lock, flags);
+
+	if (!async_cleanup)
+		tls_device_free_ctx(ctx);
 }
 
 /* We assume that the socket is already connected */
-- 
2.36.1