1 files changed, 0 insertions, 119 deletions
diff --git a/debian/patches-rt/net-Avoid-the-IPI-to-free-the.patch b/debian/patches-rt/net-Avoid-the-IPI-to-free-the.patch
deleted file mode 100644
index 6005e7a2e..000000000
--- a/debian/patches-rt/net-Avoid-the-IPI-to-free-the.patch
+++ /dev/null
@@ -1,119 +0,0 @@
-From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
-Date: Mon, 15 Aug 2022 17:29:50 +0200
-Subject: [PATCH] net: Avoid the IPI to free the
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz
-
-skb_attempt_defer_free() collects a skbs, which was allocated on a
-remote CPU, on a per-CPU list. These skbs are either freed on that
-remote CPU once the CPU enters NET_RX or an remote IPI function is
-invoked in to raise the NET_RX softirq if a threshold of pending skb has
-been exceeded.
-This remote IPI can cause the wakeup of ksoftirqd on PREEMPT_RT if the
-remote CPU idle was idle. This is undesired because once the ksoftirqd
-is running it will acquire all pending softirqs and they will not be
-executed as part of the threaded interrupt until ksoftird goes idle
-again.
-
-To void all this, schedule the deferred clean up from a worker.
-
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- include/linux/netdevice.h |    4 ++++
- net/core/dev.c            |   39 ++++++++++++++++++++++++++++++---------
- net/core/skbuff.c         |    7 ++++++-
- 3 files changed, 40 insertions(+), 10 deletions(-)
-
---- a/include/linux/netdevice.h
-+++ b/include/linux/netdevice.h
-@@ -3258,7 +3258,11 @@ struct softnet_data {
- 	int			defer_count;
- 	int			defer_ipi_scheduled;
- 	struct sk_buff		*defer_list;
-+#ifndef CONFIG_PREEMPT_RT
- 	call_single_data_t	defer_csd;
-+#else
-+	struct work_struct	defer_work;
-+#endif
- };
- 
- static inline void input_queue_head_incr(struct softnet_data *sd)
---- a/net/core/dev.c
-+++ b/net/core/dev.c
-@@ -4702,15 +4702,6 @@ static void rps_trigger_softirq(void *da
- 
- #endif /* CONFIG_RPS */
- 
--/* Called from hardirq (IPI) context */
--static void trigger_rx_softirq(void *data)
--{
--	struct softnet_data *sd = data;
--
--	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
--	smp_store_release(&sd->defer_ipi_scheduled, 0);
--}
--
- /*
-  * After we queued a packet into sd->input_pkt_queue,
-  * we need to make sure this queue is serviced soon.
-@@ -6679,6 +6670,32 @@ static void skb_defer_free_flush(struct
- 	}
- }
- 
-+#ifndef CONFIG_PREEMPT_RT
-+
-+/* Called from hardirq (IPI) context */
-+static void trigger_rx_softirq(void *data)
-+{
-+	struct softnet_data *sd = data;
-+
-+	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
-+	smp_store_release(&sd->defer_ipi_scheduled, 0);
-+}
-+
-+#else
-+
-+static void trigger_rx_softirq(struct work_struct *defer_work)
-+{
-+	struct softnet_data *sd;
-+
-+	sd = container_of(defer_work, struct softnet_data, defer_work);
-+	smp_store_release(&sd->defer_ipi_scheduled, 0);
-+	local_bh_disable();
-+	skb_defer_free_flush(sd);
-+	local_bh_enable();
-+}
-+
-+#endif
-+
- static int napi_threaded_poll(void *data)
- {
- 	struct napi_struct *napi = data;
-@@ -11603,7 +11620,11 @@ static int __init net_dev_init(void)
- 		INIT_CSD(&sd->csd, rps_trigger_softirq, sd);
- 		sd->cpu = i;
- #endif
-+#ifndef CONFIG_PREEMPT_RT
- 		INIT_CSD(&sd->defer_csd, trigger_rx_softirq, sd);
-+#else
-+		INIT_WORK(&sd->defer_work, trigger_rx_softirq);
-+#endif
- 		spin_lock_init(&sd->defer_lock);
- 
- 		init_gro_hash(&sd->backlog);
---- a/net/core/skbuff.c
-+++ b/net/core/skbuff.c
-@@ -6841,8 +6841,13 @@ nodefer:	__kfree_skb(skb);
- 	/* Make sure to trigger NET_RX_SOFTIRQ on the remote CPU
- 	 * if we are unlucky enough (this seems very unlikely).
- 	 */
--	if (unlikely(kick) && !cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
-+	if (unlikely(kick) && !cmpxchg(&sd->defer_ipi_scheduled, 0, 1)) {
-+#ifndef CONFIG_PREEMPT_RT
- 		smp_call_function_single_async(cpu, &sd->defer_csd);
-+#else
-+		schedule_work_on(cpu, &sd->defer_work);
-+#endif
-+	}
- }
- 
- static void skb_splice_csum_page(struct sk_buff *skb, struct page *page,