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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 21 Aug 2023 11:47:40 +0200
Subject: [PATCH 08/15] net: softnet_data: Make xmit per task.
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.10/older/patches-6.10.2-rt14.tar.xz
Softirq is preemptible on PREEMPT_RT. Without a per-CPU lock in
local_bh_disable() there is no guarantee that only one device is
transmitting at a time.
With preemption and multiple senders it is possible that the per-CPU
`recursion' counter gets incremented by different threads and exceeds
XMIT_RECURSION_LIMIT leading to a false positive recursion alert.
The `more' member is subject to similar problems if set by one thread
for one driver and wrongly used by another driver within another thread.
Instead of adding a lock to protect the per-CPU variable it is simpler
to make xmit per-task. Sending and receiving skbs happens always
in thread context anyway.
Having a lock to protected the per-CPU counter would block/ serialize two
sending threads needlessly. It would also require a recursive lock to
ensure that the owner can increment the counter further.
Make the softnet_data.xmit a task_struct member on PREEMPT_RT. Add
needed wrapper.
Cc: Ben Segall <bsegall@google.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/netdevice.h | 42 ++++++++++++++++++++++++++++++-----------
include/linux/netdevice_xmit.h | 13 ++++++++++++
include/linux/sched.h | 5 +++-
net/core/dev.c | 14 +++++++++++++
net/core/dev.h | 18 +++++++++++++++++
5 files changed, 80 insertions(+), 12 deletions(-)
create mode 100644 include/linux/netdevice_xmit.h
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -43,6 +43,7 @@
#include <linux/netdev_features.h>
#include <linux/neighbour.h>
+#include <linux/netdevice_xmit.h>
#include <uapi/linux/netdevice.h>
#include <uapi/linux/if_bonding.h>
#include <uapi/linux/pkt_cls.h>
@@ -3222,13 +3223,7 @@ struct softnet_data {
struct sk_buff_head xfrm_backlog;
#endif
/* written and read only by owning cpu: */
- struct {
- u16 recursion;
- u8 more;
-#ifdef CONFIG_NET_EGRESS
- u8 skip_txqueue;
-#endif
- } xmit;
+ struct netdev_xmit xmit;
#ifdef CONFIG_RPS
/* input_queue_head should be written by cpu owning this struct,
* and only read by other cpus. Worth using a cache line.
@@ -3256,10 +3251,18 @@ struct softnet_data {
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
+#ifndef CONFIG_PREEMPT_RT
static inline int dev_recursion_level(void)
{
return this_cpu_read(softnet_data.xmit.recursion);
}
+#else
+static inline int dev_recursion_level(void)
+{
+ return current->net_xmit.recursion;
+}
+
+#endif
void __netif_schedule(struct Qdisc *q);
void netif_schedule_queue(struct netdev_queue *txq);
@@ -4874,18 +4877,35 @@ static inline ktime_t netdev_get_tstamp(
return hwtstamps->hwtstamp;
}
-static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
- struct sk_buff *skb, struct net_device *dev,
- bool more)
+#ifndef CONFIG_PREEMPT_RT
+static inline void netdev_xmit_set_more(bool more)
{
__this_cpu_write(softnet_data.xmit.more, more);
- return ops->ndo_start_xmit(skb, dev);
}
static inline bool netdev_xmit_more(void)
{
return __this_cpu_read(softnet_data.xmit.more);
}
+#else
+static inline void netdev_xmit_set_more(bool more)
+{
+ current->net_xmit.more = more;
+}
+
+static inline bool netdev_xmit_more(void)
+{
+ return current->net_xmit.more;
+}
+#endif
+
+static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
+ struct sk_buff *skb, struct net_device *dev,
+ bool more)
+{
+ netdev_xmit_set_more(more);
+ return ops->ndo_start_xmit(skb, dev);
+}
static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
struct netdev_queue *txq, bool more)
--- /dev/null
+++ b/include/linux/netdevice_xmit.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _LINUX_NETDEVICE_XMIT_H
+#define _LINUX_NETDEVICE_XMIT_H
+
+struct netdev_xmit {
+ u16 recursion;
+ u8 more;
+#ifdef CONFIG_NET_EGRESS
+ u8 skip_txqueue;
+#endif
+};
+
+#endif
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -36,6 +36,7 @@
#include <linux/signal_types.h>
#include <linux/syscall_user_dispatch_types.h>
#include <linux/mm_types_task.h>
+#include <linux/netdevice_xmit.h>
#include <linux/task_io_accounting.h>
#include <linux/posix-timers_types.h>
#include <linux/restart_block.h>
@@ -981,7 +982,9 @@ struct task_struct {
/* delay due to memory thrashing */
unsigned in_thrashing:1;
#endif
-
+#ifdef CONFIG_PREEMPT_RT
+ struct netdev_xmit net_xmit;
+#endif
unsigned long atomic_flags; /* Flags requiring atomic access. */
struct restart_block restart_block;
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3940,6 +3940,7 @@ netdev_tx_queue_mapping(struct net_devic
return netdev_get_tx_queue(dev, netdev_cap_txqueue(dev, qm));
}
+#ifndef CONFIG_PREEMPT_RT
static bool netdev_xmit_txqueue_skipped(void)
{
return __this_cpu_read(softnet_data.xmit.skip_txqueue);
@@ -3950,6 +3951,19 @@ void netdev_xmit_skip_txqueue(bool skip)
__this_cpu_write(softnet_data.xmit.skip_txqueue, skip);
}
EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
+
+#else
+static bool netdev_xmit_txqueue_skipped(void)
+{
+ return current->net_xmit.skip_txqueue;
+}
+
+void netdev_xmit_skip_txqueue(bool skip)
+{
+ current->net_xmit.skip_txqueue = skip;
+}
+EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue);
+#endif
#endif /* CONFIG_NET_EGRESS */
#ifdef CONFIG_NET_XGRESS
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -150,6 +150,8 @@ struct napi_struct *napi_by_id(unsigned
void kick_defer_list_purge(struct softnet_data *sd, unsigned int cpu);
#define XMIT_RECURSION_LIMIT 8
+
+#ifndef CONFIG_PREEMPT_RT
static inline bool dev_xmit_recursion(void)
{
return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
@@ -165,5 +167,21 @@ static inline void dev_xmit_recursion_de
{
__this_cpu_dec(softnet_data.xmit.recursion);
}
+#else
+static inline bool dev_xmit_recursion(void)
+{
+ return unlikely(current->net_xmit.recursion > XMIT_RECURSION_LIMIT);
+}
+
+static inline void dev_xmit_recursion_inc(void)
+{
+ current->net_xmit.recursion++;
+}
+
+static inline void dev_xmit_recursion_dec(void)
+{
+ current->net_xmit.recursion--;
+}
+#endif
#endif
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