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Message-ID: <20240306160031.874438-5-edumazet@google.com>
Date: Wed, 6 Mar 2024 16:00:17 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, Willem de Bruijn <willemb@...gle.com>,
Soheil Hassas Yeganeh <soheil@...gle.com>, Neal Cardwell <ncardwell@...gle.com>, netdev@...r.kernel.org,
eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 04/18] net: move ptype_all into net_hotdata
ptype_all is used in rx/tx fast paths.
Move it to net_hotdata for better cache locality.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Reviewed-by: David Ahern <dsahern@...nel.org>
---
include/linux/netdevice.h | 1 -
include/net/hotdata.h | 1 +
net/core/dev.c | 16 +++++++---------
net/core/hotdata.c | 1 +
net/core/net-procfs.c | 7 ++++---
5 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 15ce809e0541078bff7a48b8d7cb2cf2c1ac8a93..e2e7d5a7ef34de165cd293eb71800e1e6b450432 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -5300,7 +5300,6 @@ static inline const char *netdev_reg_state(const struct net_device *dev)
#define PTYPE_HASH_SIZE (16)
#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
-extern struct list_head ptype_all __read_mostly;
extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
extern struct net_device *blackhole_netdev;
diff --git a/include/net/hotdata.h b/include/net/hotdata.h
index 149e56528537d8ed3365e46d6dc96e39c73a733a..d462cb8f16bad459b439c566274c01a0f18a95d0 100644
--- a/include/net/hotdata.h
+++ b/include/net/hotdata.h
@@ -7,6 +7,7 @@
/* Read mostly data used in network fast paths. */
struct net_hotdata {
struct list_head offload_base;
+ struct list_head ptype_all;
int gro_normal_batch;
int netdev_budget;
int netdev_budget_usecs;
diff --git a/net/core/dev.c b/net/core/dev.c
index 53ebdb55e8b7c0a6522eb3fdbb7bdd00948eb9a5..119b7004a8e51ea6785c60e558988d369eec8935 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -161,7 +161,6 @@
static DEFINE_SPINLOCK(ptype_lock);
struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
-struct list_head ptype_all __read_mostly; /* Taps */
static int netif_rx_internal(struct sk_buff *skb);
static int call_netdevice_notifiers_extack(unsigned long val,
@@ -540,7 +539,7 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
static inline struct list_head *ptype_head(const struct packet_type *pt)
{
if (pt->type == htons(ETH_P_ALL))
- return pt->dev ? &pt->dev->ptype_all : &ptype_all;
+ return pt->dev ? &pt->dev->ptype_all : &net_hotdata.ptype_all;
else
return pt->dev ? &pt->dev->ptype_specific :
&ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
@@ -2226,7 +2225,8 @@ static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
*/
bool dev_nit_active(struct net_device *dev)
{
- return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all);
+ return !list_empty(&net_hotdata.ptype_all) ||
+ !list_empty(&dev->ptype_all);
}
EXPORT_SYMBOL_GPL(dev_nit_active);
@@ -2237,10 +2237,9 @@ EXPORT_SYMBOL_GPL(dev_nit_active);
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
{
- struct packet_type *ptype;
+ struct list_head *ptype_list = &net_hotdata.ptype_all;
+ struct packet_type *ptype, *pt_prev = NULL;
struct sk_buff *skb2 = NULL;
- struct packet_type *pt_prev = NULL;
- struct list_head *ptype_list = &ptype_all;
rcu_read_lock();
again:
@@ -2286,7 +2285,7 @@ void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
pt_prev = ptype;
}
- if (ptype_list == &ptype_all) {
+ if (ptype_list == &net_hotdata.ptype_all) {
ptype_list = &dev->ptype_all;
goto again;
}
@@ -5387,7 +5386,7 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
if (pfmemalloc)
goto skip_taps;
- list_for_each_entry_rcu(ptype, &ptype_all, list) {
+ list_for_each_entry_rcu(ptype, &net_hotdata.ptype_all, list) {
if (pt_prev)
ret = deliver_skb(skb, pt_prev, orig_dev);
pt_prev = ptype;
@@ -11771,7 +11770,6 @@ static int __init net_dev_init(void)
if (netdev_kobject_init())
goto out;
- INIT_LIST_HEAD(&ptype_all);
for (i = 0; i < PTYPE_HASH_SIZE; i++)
INIT_LIST_HEAD(&ptype_base[i]);
diff --git a/net/core/hotdata.c b/net/core/hotdata.c
index 087c4c84987df07f11a87112a778a5cac608a654..29fcfe89fd9a697120f826dbe2fd36a1617581a1 100644
--- a/net/core/hotdata.c
+++ b/net/core/hotdata.c
@@ -7,6 +7,7 @@
struct net_hotdata net_hotdata __cacheline_aligned = {
.offload_base = LIST_HEAD_INIT(net_hotdata.offload_base),
+ .ptype_all = LIST_HEAD_INIT(net_hotdata.ptype_all),
.gro_normal_batch = 8,
.netdev_budget = 300,
diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index 2e4e96d30ee1a7a51e49587378aab47aed1290da..a97eceb84e61ec347ad132ff0f22c8ce82f12e90 100644
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -3,6 +3,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <net/wext.h>
+#include <net/hotdata.h>
#include "dev.h"
@@ -183,7 +184,7 @@ static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
}
}
- list_for_each_entry_rcu(pt, &ptype_all, list) {
+ list_for_each_entry_rcu(pt, &net_hotdata.ptype_all, list) {
if (i == pos)
return pt;
++i;
@@ -231,13 +232,13 @@ static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
}
- nxt = ptype_all.next;
+ nxt = net_hotdata.ptype_all.next;
goto ptype_all;
}
if (pt->type == htons(ETH_P_ALL)) {
ptype_all:
- if (nxt != &ptype_all)
+ if (nxt != &net_hotdata.ptype_all)
goto found;
hash = 0;
nxt = ptype_base[0].next;
--
2.44.0.278.ge034bb2e1d-goog
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