mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 13:22:55 +00:00
[NET]: Reorder some hot fields of struct net_device
Place them on separate cache lines in SMP to lower memory bouncing
between multiple CPU accessing the device.
- One part is mostly used on receive path (including
eth_type_trans()) (poll_list, poll, quota, weight, last_rx,
dev_addr, broadcast)
- One part is mostly used on queue transmit path (qdisc)
(queue_lock, qdisc, qdisc_sleeping, qdisc_list, tx_queue_len)
- One part is mostly used on xmit path (device)
(xmit_lock, xmit_lock_owner, priv, hard_start_xmit, trans_start)
'features' is placed outside of these hot points, in a location that
may be shared by all cpus (because mostly read)
name_hlist is moved close to name[IFNAMSIZ] to speedup __dev_get_by_name()
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
2d7ceece08
commit
9356b8fc07
@ -265,6 +265,8 @@ struct net_device
|
||||
* the interface.
|
||||
*/
|
||||
char name[IFNAMSIZ];
|
||||
/* device name hash chain */
|
||||
struct hlist_node name_hlist;
|
||||
|
||||
/*
|
||||
* I/O specific fields
|
||||
@ -292,6 +294,21 @@ struct net_device
|
||||
|
||||
/* ------- Fields preinitialized in Space.c finish here ------- */
|
||||
|
||||
/* Net device features */
|
||||
unsigned long features;
|
||||
#define NETIF_F_SG 1 /* Scatter/gather IO. */
|
||||
#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
|
||||
#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
|
||||
#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
|
||||
#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
|
||||
#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
|
||||
#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
|
||||
#define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
|
||||
#define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
|
||||
#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
|
||||
#define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
|
||||
#define NETIF_F_LLTX 4096 /* LockLess TX */
|
||||
|
||||
struct net_device *next_sched;
|
||||
|
||||
/* Interface index. Unique device identifier */
|
||||
@ -316,9 +333,6 @@ struct net_device
|
||||
* will (read: may be cleaned up at will).
|
||||
*/
|
||||
|
||||
/* These may be needed for future network-power-down code. */
|
||||
unsigned long trans_start; /* Time (in jiffies) of last Tx */
|
||||
unsigned long last_rx; /* Time of last Rx */
|
||||
|
||||
unsigned short flags; /* interface flags (a la BSD) */
|
||||
unsigned short gflags;
|
||||
@ -328,15 +342,12 @@ struct net_device
|
||||
unsigned mtu; /* interface MTU value */
|
||||
unsigned short type; /* interface hardware type */
|
||||
unsigned short hard_header_len; /* hardware hdr length */
|
||||
void *priv; /* pointer to private data */
|
||||
|
||||
struct net_device *master; /* Pointer to master device of a group,
|
||||
* which this device is member of.
|
||||
*/
|
||||
|
||||
/* Interface address info. */
|
||||
unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
|
||||
unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address */
|
||||
unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
|
||||
unsigned char addr_len; /* hardware address length */
|
||||
unsigned short dev_id; /* for shared network cards */
|
||||
@ -346,8 +357,6 @@ struct net_device
|
||||
int promiscuity;
|
||||
int allmulti;
|
||||
|
||||
int watchdog_timeo;
|
||||
struct timer_list watchdog_timer;
|
||||
|
||||
/* Protocol specific pointers */
|
||||
|
||||
@ -358,32 +367,62 @@ struct net_device
|
||||
void *ec_ptr; /* Econet specific data */
|
||||
void *ax25_ptr; /* AX.25 specific data */
|
||||
|
||||
struct list_head poll_list; /* Link to poll list */
|
||||
/*
|
||||
* Cache line mostly used on receive path (including eth_type_trans())
|
||||
*/
|
||||
struct list_head poll_list ____cacheline_aligned_in_smp;
|
||||
/* Link to poll list */
|
||||
|
||||
int (*poll) (struct net_device *dev, int *quota);
|
||||
int quota;
|
||||
int weight;
|
||||
unsigned long last_rx; /* Time of last Rx */
|
||||
/* Interface address info used in eth_type_trans() */
|
||||
unsigned char dev_addr[MAX_ADDR_LEN]; /* hw address, (before bcast
|
||||
because most packets are unicast) */
|
||||
|
||||
unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
|
||||
|
||||
/*
|
||||
* Cache line mostly used on queue transmit path (qdisc)
|
||||
*/
|
||||
/* device queue lock */
|
||||
spinlock_t queue_lock ____cacheline_aligned_in_smp;
|
||||
struct Qdisc *qdisc;
|
||||
struct Qdisc *qdisc_sleeping;
|
||||
struct Qdisc *qdisc_ingress;
|
||||
struct list_head qdisc_list;
|
||||
unsigned long tx_queue_len; /* Max frames per queue allowed */
|
||||
|
||||
/* ingress path synchronizer */
|
||||
spinlock_t ingress_lock;
|
||||
struct Qdisc *qdisc_ingress;
|
||||
|
||||
/*
|
||||
* One part is mostly used on xmit path (device)
|
||||
*/
|
||||
/* hard_start_xmit synchronizer */
|
||||
spinlock_t xmit_lock;
|
||||
spinlock_t xmit_lock ____cacheline_aligned_in_smp;
|
||||
/* cpu id of processor entered to hard_start_xmit or -1,
|
||||
if nobody entered there.
|
||||
*/
|
||||
int xmit_lock_owner;
|
||||
/* device queue lock */
|
||||
spinlock_t queue_lock;
|
||||
void *priv; /* pointer to private data */
|
||||
int (*hard_start_xmit) (struct sk_buff *skb,
|
||||
struct net_device *dev);
|
||||
/* These may be needed for future network-power-down code. */
|
||||
unsigned long trans_start; /* Time (in jiffies) of last Tx */
|
||||
|
||||
int watchdog_timeo; /* used by dev_watchdog() */
|
||||
struct timer_list watchdog_timer;
|
||||
|
||||
/*
|
||||
* refcnt is a very hot point, so align it on SMP
|
||||
*/
|
||||
/* Number of references to this device */
|
||||
atomic_t refcnt;
|
||||
atomic_t refcnt ____cacheline_aligned_in_smp;
|
||||
|
||||
/* delayed register/unregister */
|
||||
struct list_head todo_list;
|
||||
/* device name hash chain */
|
||||
struct hlist_node name_hlist;
|
||||
/* device index hash chain */
|
||||
struct hlist_node index_hlist;
|
||||
|
||||
@ -396,21 +435,6 @@ struct net_device
|
||||
NETREG_RELEASED, /* called free_netdev */
|
||||
} reg_state;
|
||||
|
||||
/* Net device features */
|
||||
unsigned long features;
|
||||
#define NETIF_F_SG 1 /* Scatter/gather IO. */
|
||||
#define NETIF_F_IP_CSUM 2 /* Can checksum only TCP/UDP over IPv4. */
|
||||
#define NETIF_F_NO_CSUM 4 /* Does not require checksum. F.e. loopack. */
|
||||
#define NETIF_F_HW_CSUM 8 /* Can checksum all the packets. */
|
||||
#define NETIF_F_HIGHDMA 32 /* Can DMA to high memory. */
|
||||
#define NETIF_F_FRAGLIST 64 /* Scatter/gather IO. */
|
||||
#define NETIF_F_HW_VLAN_TX 128 /* Transmit VLAN hw acceleration */
|
||||
#define NETIF_F_HW_VLAN_RX 256 /* Receive VLAN hw acceleration */
|
||||
#define NETIF_F_HW_VLAN_FILTER 512 /* Receive filtering on VLAN */
|
||||
#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
|
||||
#define NETIF_F_TSO 2048 /* Can offload TCP/IP segmentation */
|
||||
#define NETIF_F_LLTX 4096 /* LockLess TX */
|
||||
|
||||
/* Called after device is detached from network. */
|
||||
void (*uninit)(struct net_device *dev);
|
||||
/* Called after last user reference disappears. */
|
||||
@ -419,10 +443,7 @@ struct net_device
|
||||
/* Pointers to interface service routines. */
|
||||
int (*open)(struct net_device *dev);
|
||||
int (*stop)(struct net_device *dev);
|
||||
int (*hard_start_xmit) (struct sk_buff *skb,
|
||||
struct net_device *dev);
|
||||
#define HAVE_NETDEV_POLL
|
||||
int (*poll) (struct net_device *dev, int *quota);
|
||||
int (*hard_header) (struct sk_buff *skb,
|
||||
struct net_device *dev,
|
||||
unsigned short type,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user