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39564c3fdc
commit 68822bdf76 ("net: generalize skb freeing
deferral to per-cpu lists") added another per-cpu
cache of skbs. It was expected to be small,
and an IPI was forced whenever the list reached 128
skbs.
We might need to be able to control more precisely
queue capacity and added latency.
An IPI is generated whenever queue reaches half capacity.
Default value of the new limit is 64.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _NET_CORE_DEV_H
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#define _NET_CORE_DEV_H
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#include <linux/types.h>
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struct net;
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struct net_device;
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struct netdev_bpf;
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struct netdev_phys_item_id;
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struct netlink_ext_ack;
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/* Random bits of netdevice that don't need to be exposed */
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#define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */
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struct sd_flow_limit {
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u64 count;
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unsigned int num_buckets;
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unsigned int history_head;
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u16 history[FLOW_LIMIT_HISTORY];
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u8 buckets[];
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};
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extern int netdev_flow_limit_table_len;
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#ifdef CONFIG_PROC_FS
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int __init dev_proc_init(void);
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#else
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#define dev_proc_init() 0
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#endif
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void linkwatch_init_dev(struct net_device *dev);
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void linkwatch_forget_dev(struct net_device *dev);
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void linkwatch_run_queue(void);
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void dev_addr_flush(struct net_device *dev);
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int dev_addr_init(struct net_device *dev);
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void dev_addr_check(struct net_device *dev);
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/* sysctls not referred to from outside net/core/ */
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extern int netdev_budget;
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extern unsigned int netdev_budget_usecs;
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extern unsigned int sysctl_skb_defer_max;
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extern int netdev_tstamp_prequeue;
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extern int netdev_unregister_timeout_secs;
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extern int weight_p;
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extern int dev_weight_rx_bias;
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extern int dev_weight_tx_bias;
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/* rtnl helpers */
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extern struct list_head net_todo_list;
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void netdev_run_todo(void);
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/* netdev management, shared between various uAPI entry points */
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struct netdev_name_node {
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struct hlist_node hlist;
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struct list_head list;
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struct net_device *dev;
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const char *name;
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};
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int netdev_get_name(struct net *net, char *name, int ifindex);
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int dev_change_name(struct net_device *dev, const char *newname);
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int netdev_name_node_alt_create(struct net_device *dev, const char *name);
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int netdev_name_node_alt_destroy(struct net_device *dev, const char *name);
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int dev_validate_mtu(struct net_device *dev, int mtu,
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struct netlink_ext_ack *extack);
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int dev_set_mtu_ext(struct net_device *dev, int mtu,
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struct netlink_ext_ack *extack);
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int dev_get_phys_port_id(struct net_device *dev,
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struct netdev_phys_item_id *ppid);
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int dev_get_phys_port_name(struct net_device *dev,
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char *name, size_t len);
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int dev_change_proto_down(struct net_device *dev, bool proto_down);
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void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
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u32 value);
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typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
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int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
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int fd, int expected_fd, u32 flags);
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int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len);
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void dev_set_group(struct net_device *dev, int new_group);
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int dev_change_carrier(struct net_device *dev, bool new_carrier);
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void __dev_set_rx_mode(struct net_device *dev);
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static inline void netif_set_gso_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* dev->gso_max_size is read locklessly from sk_setup_caps() */
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WRITE_ONCE(dev->gso_max_size, size);
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}
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static inline void netif_set_gso_max_segs(struct net_device *dev,
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unsigned int segs)
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{
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/* dev->gso_max_segs is read locklessly from sk_setup_caps() */
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WRITE_ONCE(dev->gso_max_segs, segs);
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}
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static inline void netif_set_gro_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* This pairs with the READ_ONCE() in skb_gro_receive() */
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WRITE_ONCE(dev->gro_max_size, size);
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}
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#endif
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