netdev - [PATCH v2 net-next 09/18] net: move dev_rx_weight to net

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240306160031.874438-10-edumazet@google.com>
Date: Wed,  6 Mar 2024 16:00:22 +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 09/18] net: move dev_rx_weight to net_hotdata

dev_rx_weight is read from process_backlog().

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  | 2 --
 include/net/hotdata.h      | 1 +
 net/core/dev.c             | 3 +--
 net/core/hotdata.c         | 1 +
 net/core/sysctl_net_core.c | 2 +-
 5 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c2a735edc44be95fbd4bbd1e234d883582bfde10..d3d4d1052ecb0bc704e9bb40fffbea85cfb6ab03 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4787,8 +4787,6 @@ void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
 			   const struct pcpu_sw_netstats __percpu *netstats);
 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s);
 
-extern int		dev_rx_weight;
-
 enum {
 	NESTED_SYNC_IMM_BIT,
 	NESTED_SYNC_TODO_BIT,
diff --git a/include/net/hotdata.h b/include/net/hotdata.h
index ffea9cc263e50e4eb69f4f60e2f10c256d9b633f..e6595ed2c3be527fb90959984aca78349147f2eb 100644
--- a/include/net/hotdata.h
+++ b/include/net/hotdata.h
@@ -22,6 +22,7 @@ struct net_hotdata {
 	int			tstamp_prequeue;
 	int			max_backlog;
 	int			dev_tx_weight;
+	int			dev_rx_weight;
 };
 
 extern struct net_hotdata net_hotdata;
diff --git a/net/core/dev.c b/net/core/dev.c
index 3f8d451f42fb9ba621f1ea19e784c7f0be0bf2d8..26676dbd6c8594371a4d30e0dd95d72342e226ca 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4408,7 +4408,6 @@ unsigned int sysctl_skb_defer_max __read_mostly = 64;
 int weight_p __read_mostly = 64;           /* old backlog weight */
 int dev_weight_rx_bias __read_mostly = 1;  /* bias for backlog weight */
 int dev_weight_tx_bias __read_mostly = 1;  /* bias for output_queue quota */
-int dev_rx_weight __read_mostly = 64;
 
 /* Called with irq disabled */
 static inline void ____napi_schedule(struct softnet_data *sd,
@@ -5978,7 +5977,7 @@ static int process_backlog(struct napi_struct *napi, int quota)
 		net_rps_action_and_irq_enable(sd);
 	}
 
-	napi->weight = READ_ONCE(dev_rx_weight);
+	napi->weight = READ_ONCE(net_hotdata.dev_rx_weight);
 	while (again) {
 		struct sk_buff *skb;
 
diff --git a/net/core/hotdata.c b/net/core/hotdata.c
index ec8c3b48e8fea57491c5870055cffb44c779db44..c8a7a451c18a383d091e413a510d84d163473f2f 100644
--- a/net/core/hotdata.c
+++ b/net/core/hotdata.c
@@ -17,5 +17,6 @@ struct net_hotdata net_hotdata __cacheline_aligned = {
 	.tstamp_prequeue = 1,
 	.max_backlog = 1000,
 	.dev_tx_weight = 64,
+	.dev_rx_weight = 64,
 };
 EXPORT_SYMBOL(net_hotdata);
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index a30016a8660e09db89b3153e4103c185a800a2ef..8a4c698dad9c97636ca9cebfad925d4220e98f2a 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -301,7 +301,7 @@ static int proc_do_dev_weight(struct ctl_table *table, int write,
 	ret = proc_dointvec(table, write, buffer, lenp, ppos);
 	if (!ret && write) {
 		weight = READ_ONCE(weight_p);
-		WRITE_ONCE(dev_rx_weight, weight * dev_weight_rx_bias);
+		WRITE_ONCE(net_hotdata.dev_rx_weight, weight * dev_weight_rx_bias);
 		WRITE_ONCE(net_hotdata.dev_tx_weight, weight * dev_weight_tx_bias);
 	}
 	mutex_unlock(&dev_weight_mutex);
-- 
2.44.0.278.ge034bb2e1d-goog