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Message-ID: <20240314200845.3050179-1-edumazet@google.com>
Date: Thu, 14 Mar 2024 20:08:45 +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: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>, Coco Li <lixiaoyan@...gle.com>
Subject: [PATCH net] net: move dev->state into net_device_read_txrx group
dev->state can be read in rx and tx fast paths.
netif_running() which needs dev->state is called from
- enqueue_to_backlog() [RX path]
- __dev_direct_xmit() [TX path]
Fixes: 43a71cd66b9c ("net-device: reorganize net_device fast path variables")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Coco Li <lixiaoyan@...gle.com>
---
Documentation/networking/net_cachelines/net_device.rst | 2 +-
include/linux/netdevice.h | 2 +-
net/core/dev.c | 3 ++-
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/Documentation/networking/net_cachelines/net_device.rst b/Documentation/networking/net_cachelines/net_device.rst
index dceb49d56a91158232543e920c7ed23bed74106e..70c4fb9d4e5ce0feb0d82578b878da3dbd00a7fb 100644
--- a/Documentation/networking/net_cachelines/net_device.rst
+++ b/Documentation/networking/net_cachelines/net_device.rst
@@ -13,7 +13,7 @@ struct_dev_ifalias* ifalias
unsigned_long mem_end
unsigned_long mem_start
unsigned_long base_addr
-unsigned_long state
+unsigned_long state read_mostly read_mostly netif_running(dev)
struct_list_head dev_list
struct_list_head napi_list
struct_list_head unreg_list
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c6f6ac779b34ef1a8f98853c84a7a2e0192e0e8f..cb37817d6382c29117afd8ce54db6dba94f8c930 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2072,6 +2072,7 @@ struct net_device {
struct pcpu_sw_netstats __percpu *tstats;
struct pcpu_dstats __percpu *dstats;
};
+ unsigned long state;
unsigned int flags;
unsigned short hard_header_len;
netdev_features_t features;
@@ -2117,7 +2118,6 @@ struct net_device {
* part of the usual set specified in Space.c.
*/
- unsigned long state;
struct list_head dev_list;
struct list_head napi_list;
diff --git a/net/core/dev.c b/net/core/dev.c
index 0766a245816bdf70f6609dc7b6d694ae81e7a9e5..8db23b3c55f10a98870b2b4b9c403bbf48c41d77 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11665,11 +11665,12 @@ static void __init net_dev_struct_check(void)
/* TXRX read-mostly hotpath */
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, lstats);
+ CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, state);
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags);
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len);
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features);
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr);
- CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 38);
+ CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 46);
/* RX read-mostly hotpath */
CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific);
--
2.44.0.291.gc1ea87d7ee-goog
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