bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
{
struct iphdr *iphdr;
int data_len;
bool ret = false;
skb_reset_mac_header(skb);
if (eth_hdr(skb)->h_proto != htons(ETH_P_IP))
return false;
iphdr = ip_hdr(skb);
if (iphdr->version == 4) {
if (iphdr->protocol == IPPROTO_TCP)
data_len = 12;
else
data_len = 8;
*hash = comp_hash(netvsc_hash_key, HASH_KEYLEN,
(u8 *)&iphdr->saddr, data_len);
ret = true;
}
return ret;
}
static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
{
struct flow_keys flow;
int data_len;
if (!skb_flow_dissect_flow_keys(skb, &flow) ||
!(flow.basic.n_proto == htons(ETH_P_IP) ||
flow.basic.n_proto == htons(ETH_P_IPV6)))
return false;
if (flow.basic.ip_proto == IPPROTO_TCP)
data_len = 12;
else
data_len = 8;
*hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len);
return true;
}
/* Continue using Toeplitz hash function.
* This implementation is different from the current upstream code.
* See more info from this upstream commit:
* 757647e10e55c01fb7a9c4356529442e316a7c72
*/
bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
{
struct iphdr *iphdr;
struct ipv6hdr *ipv6hdr;
__be32 dbuf[9];
int data_len;
if (eth_hdr(skb)->h_proto != htons(ETH_P_IP) &&
eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))
return false;
iphdr = ip_hdr(skb);
ipv6hdr = ipv6_hdr(skb);
if (iphdr->version == 4) {
dbuf[0] = iphdr->saddr;
dbuf[1] = iphdr->daddr;
if (iphdr->protocol == IPPROTO_TCP) {
dbuf[2] = *(__be32 *)&tcp_hdr(skb)->source;
data_len = 12;
} else {
data_len = 8;
}
} else if (ipv6hdr->version == 6) {
memcpy(dbuf, &ipv6hdr->saddr, 32);
if (ipv6hdr->nexthdr == IPPROTO_TCP) {
dbuf[8] = *(__be32 *)&tcp_hdr(skb)->source;
data_len = 36;
} else {
data_len = 32;
}
} else {
return false;
}
*hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, dbuf, data_len);
return true;
}
