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Message-ID: <20231017014716.3944813-5-lixiaoyan@google.com>
Date: Tue, 17 Oct 2023 01:47:15 +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>, David Ahern <dsahern@...nel.org>
Subject: [PATCH v2 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
Signed-off-by: Coco Li <lixiaoyan@...gle.com>
Suggested-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: David Ahern <dsahern@...nel.org>
---
include/linux/netdevice.h | 99 ++++++++++++++++++++-------------------
1 file changed, 52 insertions(+), 47 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1c7681263d302..d72b71b76bf82 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2053,6 +2053,58 @@ enum netdev_ml_priv_type {
*/
struct net_device {
+ /* Caacheline organization can be found documented in
+ * Documentation/networking/net_cachelines/net_device.rst.
+ * Please update the document when adding new fields.
+ */
+
+ /* 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;
+ 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;
@@ -2077,7 +2129,6 @@ 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;
@@ -2085,25 +2136,12 @@ 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;
@@ -2147,8 +2185,6 @@ struct net_device {
const struct tlsdev_ops *tlsdev_ops;
#endif
- const struct header_ops *header_ops;
-
unsigned char operstate;
unsigned char link_mode;
@@ -2189,9 +2225,7 @@ 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
@@ -2226,23 +2260,14 @@ 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
@@ -2260,24 +2285,15 @@ 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);
@@ -2317,12 +2333,6 @@ 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;
@@ -2356,20 +2366,15 @@ 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)
--
2.42.0.655.g421f12c284-goog
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