diff options
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2eed17bcb2d..cbc34c0db37 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -124,6 +124,8 @@ #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/in.h> +#include <linux/jhash.h> +#include <linux/random.h> #include "net-sysfs.h" @@ -1325,7 +1327,8 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) void __netif_schedule(struct Qdisc *q) { - BUG_ON(q == &noop_qdisc); + if (WARN_ON_ONCE(q == &noop_qdisc)) + return; if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) { struct softnet_data *sd; @@ -1668,34 +1671,37 @@ out_kfree_skb: * --BLG */ +static u32 simple_tx_hashrnd; +static int simple_tx_hashrnd_initialized = 0; + static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb) { - u32 *addr, *ports, hash, ihl; + u32 addr1, addr2, ports; + u32 hash, ihl; u8 ip_proto; - int alen; + + if (unlikely(!simple_tx_hashrnd_initialized)) { + get_random_bytes(&simple_tx_hashrnd, 4); + simple_tx_hashrnd_initialized = 1; + } switch (skb->protocol) { case __constant_htons(ETH_P_IP): ip_proto = ip_hdr(skb)->protocol; - addr = &ip_hdr(skb)->saddr; + addr1 = ip_hdr(skb)->saddr; + addr2 = ip_hdr(skb)->daddr; ihl = ip_hdr(skb)->ihl; - alen = 2; break; case __constant_htons(ETH_P_IPV6): ip_proto = ipv6_hdr(skb)->nexthdr; - addr = &ipv6_hdr(skb)->saddr.s6_addr32[0]; + addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3]; + addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3]; ihl = (40 >> 2); - alen = 8; break; default: return 0; } - ports = (u32 *) (skb_network_header(skb) + (ihl * 4)); - - hash = 0; - while (alen--) - hash ^= *addr++; switch (ip_proto) { case IPPROTO_TCP: @@ -1705,14 +1711,17 @@ static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb) case IPPROTO_AH: case IPPROTO_SCTP: case IPPROTO_UDPLITE: - hash ^= *ports; + ports = *((u32 *) (skb_network_header(skb) + (ihl * 4))); break; default: + ports = 0; break; } - return hash % dev->real_num_tx_queues; + hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd); + + return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); } static struct netdev_queue *dev_pick_tx(struct net_device *dev, |