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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/net/wireguard/queueing.h
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@@ -17,12 +17,13 @@
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 struct wg_peer;
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 struct multicore_worker;
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 struct crypt_queue;
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+struct prev_queue;
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 struct sk_buff;
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 /* queueing.c APIs: */
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 int wg_packet_queue_init(struct crypt_queue *queue, work_func_t function,
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-			 bool multicore, unsigned int len);
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-void wg_packet_queue_free(struct crypt_queue *queue, bool multicore);
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+			 unsigned int len);
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+void wg_packet_queue_free(struct crypt_queue *queue, bool purge);
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 struct multicore_worker __percpu *
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 wg_packet_percpu_multicore_worker_alloc(work_func_t function, void *ptr);
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@@ -93,13 +94,13 @@
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 	skb->dev = NULL;
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 #ifdef CONFIG_NET_SCHED
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 	skb->tc_index = 0;
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-	skb_reset_tc(skb);
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 #endif
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+	skb_reset_redirect(skb);
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 	skb->hdr_len = skb_headroom(skb);
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 	skb_reset_mac_header(skb);
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 	skb_reset_network_header(skb);
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 	skb_reset_transport_header(skb);
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-	skb_probe_transport_header(skb, 0);
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+	skb_probe_transport_header(skb);
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 	skb_reset_inner_headers(skb);
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 }
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@@ -118,26 +119,46 @@
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 	return cpu;
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 }
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-/* This function is racy, in the sense that next is unlocked, so it could return
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- * the same CPU twice. A race-free version of this would be to instead store an
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- * atomic sequence number, do an increment-and-return, and then iterate through
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- * every possible CPU until we get to that index -- choose_cpu. However that's
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- * a bit slower, and it doesn't seem like this potential race actually
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- * introduces any performance loss, so we live with it.
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+/* This function is racy, in the sense that it's called while last_cpu is
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+ * unlocked, so it could return the same CPU twice. Adding locking or using
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+ * atomic sequence numbers is slower though, and the consequences of racing are
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+ * harmless, so live with it.
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  */
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-static inline int wg_cpumask_next_online(int *next)
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+static inline int wg_cpumask_next_online(int *last_cpu)
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 {
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-	int cpu = *next;
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-
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-	while (unlikely(!cpumask_test_cpu(cpu, cpu_online_mask)))
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-		cpu = cpumask_next(cpu, cpu_online_mask) % nr_cpumask_bits;
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-	*next = cpumask_next(cpu, cpu_online_mask) % nr_cpumask_bits;
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+	int cpu = cpumask_next(*last_cpu, cpu_online_mask);
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+	if (cpu >= nr_cpu_ids)
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+		cpu = cpumask_first(cpu_online_mask);
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+	*last_cpu = cpu;
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 	return cpu;
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 }
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135
 
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+void wg_prev_queue_init(struct prev_queue *queue);
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+
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+/* Multi producer */
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+bool wg_prev_queue_enqueue(struct prev_queue *queue, struct sk_buff *skb);
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+
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+/* Single consumer */
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+struct sk_buff *wg_prev_queue_dequeue(struct prev_queue *queue);
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+
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+/* Single consumer */
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+static inline struct sk_buff *wg_prev_queue_peek(struct prev_queue *queue)
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+{
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+	if (queue->peeked)
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+		return queue->peeked;
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+	queue->peeked = wg_prev_queue_dequeue(queue);
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+	return queue->peeked;
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+}
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+
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+/* Single consumer */
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+static inline void wg_prev_queue_drop_peeked(struct prev_queue *queue)
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+{
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+	queue->peeked = NULL;
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+}
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+
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 static inline int wg_queue_enqueue_per_device_and_peer(
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-	struct crypt_queue *device_queue, struct crypt_queue *peer_queue,
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-	struct sk_buff *skb, struct workqueue_struct *wq, int *next_cpu)
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+	struct crypt_queue *device_queue, struct prev_queue *peer_queue,
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+	struct sk_buff *skb, struct workqueue_struct *wq)
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 {
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 	int cpu;
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164
 
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@@ -145,21 +166,20 @@
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 	/* We first queue this up for the peer ingestion, but the consumer
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 	 * will wait for the state to change to CRYPTED or DEAD before.
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 	 */
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-	if (unlikely(ptr_ring_produce_bh(&peer_queue->ring, skb)))
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+	if (unlikely(!wg_prev_queue_enqueue(peer_queue, skb)))
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 		return -ENOSPC;
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+
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 	/* Then we queue it up in the device queue, which consumes the
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 	 * packet as soon as it can.
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 	 */
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-	cpu = wg_cpumask_next_online(next_cpu);
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+	cpu = wg_cpumask_next_online(&device_queue->last_cpu);
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 	if (unlikely(ptr_ring_produce_bh(&device_queue->ring, skb)))
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 		return -EPIPE;
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 	queue_work_on(cpu, wq, &per_cpu_ptr(device_queue->worker, cpu)->work);
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 	return 0;
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 }
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-static inline void wg_queue_enqueue_per_peer(struct crypt_queue *queue,
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-					     struct sk_buff *skb,
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-					     enum packet_state state)
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+static inline void wg_queue_enqueue_per_peer_tx(struct sk_buff *skb, enum packet_state state)
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 {
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 	/* We take a reference, because as soon as we call atomic_set, the
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 	 * peer can be freed from below us.
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@@ -167,14 +187,12 @@
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 	struct wg_peer *peer = wg_peer_get(PACKET_PEER(skb));
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 	atomic_set_release(&PACKET_CB(skb)->state, state);
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-	queue_work_on(wg_cpumask_choose_online(&peer->serial_work_cpu,
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-					       peer->internal_id),
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-		      peer->device->packet_crypt_wq, &queue->work);
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+	queue_work_on(wg_cpumask_choose_online(&peer->serial_work_cpu, peer->internal_id),
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+		      peer->device->packet_crypt_wq, &peer->transmit_packet_work);
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 	wg_peer_put(peer);
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 }
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-static inline void wg_queue_enqueue_per_peer_napi(struct sk_buff *skb,
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-						  enum packet_state state)
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+static inline void wg_queue_enqueue_per_peer_rx(struct sk_buff *skb, enum packet_state state)
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 {
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 	/* We take a reference, because as soon as we call atomic_set, the
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 	 * peer can be freed from below us.