| 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
| ||
|
Message-ID: <20230916010625.2771731-5-lixiaoyan@google.com>
Date: Sat, 16 Sep 2023 01:06:24 +0000
From: Coco Li <lixiaoyan@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>, Mubashir Adnan Qureshi <mubashirq@...gle.com>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>,
Coco Li <lixiaoyan@...gle.com>
Subject: [PATCH v1 net-next 4/5] net-device: reorganize net_device fast path variables
Reorganize fast path variables on tx-txrx-rx order
Fastpath variables end after npinfo.
Below data generated with pahole on x86 architecture.
Fast path variables span cache lines before change: 12
Fast path variables span cache lines after change: 4
Tested:
Built and installed.
Signed-off-by: Coco Li <lixiaoyan@...gle.com>
Suggested-by: Eric Dumazet <edumazet@...gle.com>
---
include/linux/netdevice.h | 96 +++++++++++++++++++--------------------
1 file changed, 48 insertions(+), 48 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0896aaa91dd7b..e52ee8d51add5 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2054,6 +2054,54 @@ enum netdev_ml_priv_type {
*/
struct net_device {
+ /* TX read-mostly hotpath */
+ unsigned long long priv_flags;
+ const struct net_device_ops *netdev_ops;
+ const struct header_ops *header_ops;
+ struct netdev_queue *_tx;
+ unsigned int real_num_tx_queues;
+ unsigned int gso_max_size;
+ unsigned int gso_ipv4_max_size;
+ u16 gso_max_segs;
+ s16 num_tc;
+ /* Note : dev->mtu is often read without holding a lock.
+ * Writers usually hold RTNL.
+ * It is recommended to use READ_ONCE() to annotate the reads,
+ * and to use WRITE_ONCE() to annotate the writes.
+ */
+ unsigned int mtu;
+ unsigned short needed_headroom;
+ struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
+#ifdef CONFIG_XPS
+ struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX];
+#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+ struct nf_hook_entries __rcu *nf_hooks_egress;
+#endif
+
+ /* TXRX read-mostly hotpath */
+ unsigned int flags;
+ unsigned short hard_header_len;
+ netdev_features_t features;
+ struct inet6_dev __rcu *ip6_ptr;
+
+ /* RX read-mostly hotpath */
+ struct list_head ptype_specific;
+ int ifindex;
+ unsigned int real_num_rx_queues;
+ struct netdev_rx_queue *_rx;
+ unsigned long gro_flush_timeout;
+ int napi_defer_hard_irqs;
+ unsigned int gro_max_size;
+ unsigned int gro_ipv4_max_size;
+ unsigned threaded:1;
+ rx_handler_func_t __rcu *rx_handler;
+ void __rcu *rx_handler_data;
+ possible_net_t nd_net;
+#ifdef CONFIG_NETPOLL
+ struct netpoll_info __rcu *npinfo;
+#endif
+
char name[IFNAMSIZ];
struct netdev_name_node *name_node;
struct dev_ifalias __rcu *ifalias;
@@ -2078,7 +2126,6 @@ struct net_device {
struct list_head unreg_list;
struct list_head close_list;
struct list_head ptype_all;
- struct list_head ptype_specific;
struct {
struct list_head upper;
@@ -2086,25 +2133,12 @@ struct net_device {
} adj_list;
/* Read-mostly cache-line for fast-path access */
- unsigned int flags;
xdp_features_t xdp_features;
- unsigned long long priv_flags;
- const struct net_device_ops *netdev_ops;
const struct xdp_metadata_ops *xdp_metadata_ops;
- int ifindex;
unsigned short gflags;
- unsigned short hard_header_len;
- /* Note : dev->mtu is often read without holding a lock.
- * Writers usually hold RTNL.
- * It is recommended to use READ_ONCE() to annotate the reads,
- * and to use WRITE_ONCE() to annotate the writes.
- */
- unsigned int mtu;
- unsigned short needed_headroom;
unsigned short needed_tailroom;
- netdev_features_t features;
netdev_features_t hw_features;
netdev_features_t wanted_features;
netdev_features_t vlan_features;
@@ -2148,8 +2182,6 @@ struct net_device {
const struct tlsdev_ops *tlsdev_ops;
#endif
- const struct header_ops *header_ops;
-
unsigned char operstate;
unsigned char link_mode;
@@ -2190,9 +2222,7 @@ struct net_device {
/* Protocol-specific pointers */
-
struct in_device __rcu *ip_ptr;
- struct inet6_dev __rcu *ip6_ptr;
#if IS_ENABLED(CONFIG_VLAN_8021Q)
struct vlan_info __rcu *vlan_info;
#endif
@@ -2227,23 +2257,14 @@ struct net_device {
/* Interface address info used in eth_type_trans() */
const unsigned char *dev_addr;
- struct netdev_rx_queue *_rx;
unsigned int num_rx_queues;
- unsigned int real_num_rx_queues;
-
struct bpf_prog __rcu *xdp_prog;
- unsigned long gro_flush_timeout;
- int napi_defer_hard_irqs;
#define GRO_LEGACY_MAX_SIZE 65536u
/* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE),
* and shinfo->gso_segs is a 16bit field.
*/
#define GRO_MAX_SIZE (8 * 65535u)
- unsigned int gro_max_size;
- unsigned int gro_ipv4_max_size;
unsigned int xdp_zc_max_segs;
- rx_handler_func_t __rcu *rx_handler;
- void __rcu *rx_handler_data;
#ifdef CONFIG_NET_XGRESS
struct bpf_mprog_entry __rcu *tcx_ingress;
#endif
@@ -2261,24 +2282,15 @@ struct net_device {
/*
* Cache lines mostly used on transmit path
*/
- struct netdev_queue *_tx ____cacheline_aligned_in_smp;
unsigned int num_tx_queues;
- unsigned int real_num_tx_queues;
struct Qdisc __rcu *qdisc;
unsigned int tx_queue_len;
spinlock_t tx_global_lock;
struct xdp_dev_bulk_queue __percpu *xdp_bulkq;
-
-#ifdef CONFIG_XPS
- struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX];
-#endif
#ifdef CONFIG_NET_XGRESS
struct bpf_mprog_entry __rcu *tcx_egress;
#endif
-#ifdef CONFIG_NETFILTER_EGRESS
- struct nf_hook_entries __rcu *nf_hooks_egress;
-#endif
#ifdef CONFIG_NET_SCHED
DECLARE_HASHTABLE (qdisc_hash, 4);
@@ -2318,12 +2330,6 @@ struct net_device {
bool needs_free_netdev;
void (*priv_destructor)(struct net_device *dev);
-#ifdef CONFIG_NETPOLL
- struct netpoll_info __rcu *npinfo;
-#endif
-
- possible_net_t nd_net;
-
/* mid-layer private */
void *ml_priv;
enum netdev_ml_priv_type ml_priv_type;
@@ -2357,20 +2363,15 @@ struct net_device {
*/
#define GSO_MAX_SIZE (8 * GSO_MAX_SEGS)
- unsigned int gso_max_size;
#define TSO_LEGACY_MAX_SIZE 65536
#define TSO_MAX_SIZE UINT_MAX
unsigned int tso_max_size;
- u16 gso_max_segs;
#define TSO_MAX_SEGS U16_MAX
u16 tso_max_segs;
- unsigned int gso_ipv4_max_size;
#ifdef CONFIG_DCB
const struct dcbnl_rtnl_ops *dcbnl_ops;
#endif
- s16 num_tc;
- struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
u8 prio_tc_map[TC_BITMASK + 1];
#if IS_ENABLED(CONFIG_FCOE)
@@ -2384,7 +2385,6 @@ struct net_device {
struct lock_class_key *qdisc_tx_busylock;
bool proto_down;
unsigned wol_enabled:1;
- unsigned threaded:1;
struct list_head net_notifier_list;
--
2.42.0.459.ge4e396fd5e-goog
Powered by blists - more mailing lists