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net: move rx and tx hash functions to net/core/flow_dissector.c
__skb_tx_hash() and __skb_get_rxhash() are all for calculating hash value based by some fields in skb, mostly used for selecting queues by device drivers. Meanwhile, net/core/dev.c is bloating. Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
David S. Miller
parent
cd5f20461d
commit
441d9d327f
175
net/core/dev.c
175
net/core/dev.c
@ -134,7 +134,6 @@
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#include <linux/cpu_rmap.h>
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#include <linux/net_tstamp.h>
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#include <linux/static_key.h>
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#include <net/flow_keys.h>
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#include "net-sysfs.h"
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@ -2636,136 +2635,6 @@ out:
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return rc;
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}
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static u32 hashrnd __read_mostly;
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/*
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* Returns a Tx hash based on the given packet descriptor a Tx queues' number
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* to be used as a distribution range.
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*/
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u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
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unsigned int num_tx_queues)
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{
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u32 hash;
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u16 qoffset = 0;
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u16 qcount = num_tx_queues;
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if (skb_rx_queue_recorded(skb)) {
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hash = skb_get_rx_queue(skb);
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while (unlikely(hash >= num_tx_queues))
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hash -= num_tx_queues;
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return hash;
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}
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if (dev->num_tc) {
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u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
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qoffset = dev->tc_to_txq[tc].offset;
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qcount = dev->tc_to_txq[tc].count;
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}
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if (skb->sk && skb->sk->sk_hash)
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hash = skb->sk->sk_hash;
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else
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hash = (__force u16) skb->protocol;
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hash = jhash_1word(hash, hashrnd);
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return (u16) (((u64) hash * qcount) >> 32) + qoffset;
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}
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EXPORT_SYMBOL(__skb_tx_hash);
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static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
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{
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if (unlikely(queue_index >= dev->real_num_tx_queues)) {
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net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
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dev->name, queue_index,
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dev->real_num_tx_queues);
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return 0;
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}
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return queue_index;
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}
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static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
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{
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#ifdef CONFIG_XPS
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struct xps_dev_maps *dev_maps;
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struct xps_map *map;
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int queue_index = -1;
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rcu_read_lock();
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dev_maps = rcu_dereference(dev->xps_maps);
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if (dev_maps) {
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map = rcu_dereference(
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dev_maps->cpu_map[raw_smp_processor_id()]);
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if (map) {
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if (map->len == 1)
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queue_index = map->queues[0];
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else {
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u32 hash;
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if (skb->sk && skb->sk->sk_hash)
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hash = skb->sk->sk_hash;
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else
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hash = (__force u16) skb->protocol ^
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skb->rxhash;
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hash = jhash_1word(hash, hashrnd);
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queue_index = map->queues[
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((u64)hash * map->len) >> 32];
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}
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if (unlikely(queue_index >= dev->real_num_tx_queues))
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queue_index = -1;
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}
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}
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rcu_read_unlock();
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return queue_index;
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#else
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return -1;
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#endif
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}
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u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
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{
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struct sock *sk = skb->sk;
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int queue_index = sk_tx_queue_get(sk);
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if (queue_index < 0 || skb->ooo_okay ||
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queue_index >= dev->real_num_tx_queues) {
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int new_index = get_xps_queue(dev, skb);
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if (new_index < 0)
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new_index = skb_tx_hash(dev, skb);
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if (queue_index != new_index && sk) {
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struct dst_entry *dst =
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rcu_dereference_check(sk->sk_dst_cache, 1);
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if (dst && skb_dst(skb) == dst)
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sk_tx_queue_set(sk, queue_index);
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}
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queue_index = new_index;
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}
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return queue_index;
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}
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EXPORT_SYMBOL(__netdev_pick_tx);
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struct netdev_queue *netdev_pick_tx(struct net_device *dev,
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struct sk_buff *skb)
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{
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int queue_index = 0;
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if (dev->real_num_tx_queues != 1) {
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const struct net_device_ops *ops = dev->netdev_ops;
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if (ops->ndo_select_queue)
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queue_index = ops->ndo_select_queue(dev, skb);
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else
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queue_index = __netdev_pick_tx(dev, skb);
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queue_index = dev_cap_txqueue(dev, queue_index);
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}
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skb_set_queue_mapping(skb, queue_index);
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return netdev_get_tx_queue(dev, queue_index);
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}
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static void qdisc_pkt_len_init(struct sk_buff *skb)
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{
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const struct skb_shared_info *shinfo = skb_shinfo(skb);
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@ -3015,41 +2884,6 @@ static inline void ____napi_schedule(struct softnet_data *sd,
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__raise_softirq_irqoff(NET_RX_SOFTIRQ);
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}
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/*
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* __skb_get_rxhash: calculate a flow hash based on src/dst addresses
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* and src/dst port numbers. Sets rxhash in skb to non-zero hash value
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* on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
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* if hash is a canonical 4-tuple hash over transport ports.
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*/
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void __skb_get_rxhash(struct sk_buff *skb)
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{
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struct flow_keys keys;
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u32 hash;
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if (!skb_flow_dissect(skb, &keys))
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return;
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if (keys.ports)
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skb->l4_rxhash = 1;
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/* get a consistent hash (same value on both flow directions) */
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if (((__force u32)keys.dst < (__force u32)keys.src) ||
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(((__force u32)keys.dst == (__force u32)keys.src) &&
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((__force u16)keys.port16[1] < (__force u16)keys.port16[0]))) {
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swap(keys.dst, keys.src);
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swap(keys.port16[0], keys.port16[1]);
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}
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hash = jhash_3words((__force u32)keys.dst,
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(__force u32)keys.src,
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(__force u32)keys.ports, hashrnd);
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if (!hash)
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hash = 1;
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skb->rxhash = hash;
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}
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EXPORT_SYMBOL(__skb_get_rxhash);
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#ifdef CONFIG_RPS
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/* One global table that all flow-based protocols share. */
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@ -7308,12 +7142,3 @@ out:
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}
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subsys_initcall(net_dev_init);
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static int __init initialize_hashrnd(void)
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{
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get_random_bytes(&hashrnd, sizeof(hashrnd));
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return 0;
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}
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late_initcall_sync(initialize_hashrnd);
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@ -143,3 +143,176 @@ ipv6:
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return true;
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}
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EXPORT_SYMBOL(skb_flow_dissect);
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static u32 hashrnd __read_mostly;
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/*
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* __skb_get_rxhash: calculate a flow hash based on src/dst addresses
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* and src/dst port numbers. Sets rxhash in skb to non-zero hash value
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* on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
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* if hash is a canonical 4-tuple hash over transport ports.
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*/
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void __skb_get_rxhash(struct sk_buff *skb)
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{
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struct flow_keys keys;
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u32 hash;
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if (!skb_flow_dissect(skb, &keys))
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return;
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if (keys.ports)
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skb->l4_rxhash = 1;
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/* get a consistent hash (same value on both flow directions) */
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if (((__force u32)keys.dst < (__force u32)keys.src) ||
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(((__force u32)keys.dst == (__force u32)keys.src) &&
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((__force u16)keys.port16[1] < (__force u16)keys.port16[0]))) {
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swap(keys.dst, keys.src);
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swap(keys.port16[0], keys.port16[1]);
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}
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hash = jhash_3words((__force u32)keys.dst,
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(__force u32)keys.src,
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(__force u32)keys.ports, hashrnd);
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if (!hash)
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hash = 1;
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skb->rxhash = hash;
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}
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EXPORT_SYMBOL(__skb_get_rxhash);
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/*
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* Returns a Tx hash based on the given packet descriptor a Tx queues' number
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* to be used as a distribution range.
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*/
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u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
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unsigned int num_tx_queues)
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{
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u32 hash;
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u16 qoffset = 0;
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u16 qcount = num_tx_queues;
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if (skb_rx_queue_recorded(skb)) {
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hash = skb_get_rx_queue(skb);
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while (unlikely(hash >= num_tx_queues))
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hash -= num_tx_queues;
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return hash;
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}
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if (dev->num_tc) {
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u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
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qoffset = dev->tc_to_txq[tc].offset;
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qcount = dev->tc_to_txq[tc].count;
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}
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if (skb->sk && skb->sk->sk_hash)
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hash = skb->sk->sk_hash;
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else
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hash = (__force u16) skb->protocol;
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hash = jhash_1word(hash, hashrnd);
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return (u16) (((u64) hash * qcount) >> 32) + qoffset;
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}
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EXPORT_SYMBOL(__skb_tx_hash);
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static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
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{
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if (unlikely(queue_index >= dev->real_num_tx_queues)) {
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net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
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dev->name, queue_index,
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dev->real_num_tx_queues);
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return 0;
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}
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return queue_index;
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}
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static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
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{
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#ifdef CONFIG_XPS
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struct xps_dev_maps *dev_maps;
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struct xps_map *map;
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int queue_index = -1;
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rcu_read_lock();
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dev_maps = rcu_dereference(dev->xps_maps);
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if (dev_maps) {
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map = rcu_dereference(
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dev_maps->cpu_map[raw_smp_processor_id()]);
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if (map) {
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if (map->len == 1)
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queue_index = map->queues[0];
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else {
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u32 hash;
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if (skb->sk && skb->sk->sk_hash)
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hash = skb->sk->sk_hash;
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else
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hash = (__force u16) skb->protocol ^
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skb->rxhash;
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hash = jhash_1word(hash, hashrnd);
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queue_index = map->queues[
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((u64)hash * map->len) >> 32];
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}
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if (unlikely(queue_index >= dev->real_num_tx_queues))
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queue_index = -1;
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}
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}
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rcu_read_unlock();
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return queue_index;
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#else
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return -1;
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#endif
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}
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u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
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{
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struct sock *sk = skb->sk;
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int queue_index = sk_tx_queue_get(sk);
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if (queue_index < 0 || skb->ooo_okay ||
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queue_index >= dev->real_num_tx_queues) {
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int new_index = get_xps_queue(dev, skb);
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if (new_index < 0)
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new_index = skb_tx_hash(dev, skb);
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if (queue_index != new_index && sk) {
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struct dst_entry *dst =
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rcu_dereference_check(sk->sk_dst_cache, 1);
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if (dst && skb_dst(skb) == dst)
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sk_tx_queue_set(sk, queue_index);
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}
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queue_index = new_index;
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}
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return queue_index;
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}
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EXPORT_SYMBOL(__netdev_pick_tx);
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struct netdev_queue *netdev_pick_tx(struct net_device *dev,
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struct sk_buff *skb)
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{
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int queue_index = 0;
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if (dev->real_num_tx_queues != 1) {
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const struct net_device_ops *ops = dev->netdev_ops;
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if (ops->ndo_select_queue)
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queue_index = ops->ndo_select_queue(dev, skb);
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else
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queue_index = __netdev_pick_tx(dev, skb);
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queue_index = dev_cap_txqueue(dev, queue_index);
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}
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skb_set_queue_mapping(skb, queue_index);
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return netdev_get_tx_queue(dev, queue_index);
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}
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static int __init initialize_hashrnd(void)
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{
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get_random_bytes(&hashrnd, sizeof(hashrnd));
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return 0;
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}
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late_initcall_sync(initialize_hashrnd);
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