[PATCH 15/15] ipvs: avoid kmem_cache_zalloc in ip_vs_conn_new

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Julian Anastasov <ja@xxxxxx>

We have many fields to set and few to reset,
use kmem_cache_alloc instead to save some cycles.

Signed-off-by: Julian Anastasov <ja@xxxxxx>
Signed-off by: Hans Schillstrom <hans@xxxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 include/net/ip_vs.h             |   15 +++++++++++++++
 net/netfilter/ipvs/ip_vs_conn.c |   24 +++++++++++++++++++-----
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 7122f7b..6b450c6 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -233,6 +233,21 @@ static inline void ip_vs_addr_copy(int af, union 
nf_inet_addr *dst,
        dst->ip = src->ip;
 }
 
+static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
+                                 const union nf_inet_addr *src)
+{
+#ifdef CONFIG_IP_VS_IPV6
+       if (af == AF_INET6) {
+               dst->in6 = src->in6;
+               return;
+       }
+#endif
+       dst->ip = src->ip;
+       dst->all[1] = 0;
+       dst->all[2] = 0;
+       dst->all[3] = 0;
+}
+
 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
                                   const union nf_inet_addr *b)
 {
diff --git a/net/netfilter/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index 416015b..e3e2b4d 100644
--- a/net/netfilter/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
@@ -861,7 +861,7 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p,
        struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
                                                           p->protocol);
 
-       cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
+       cp = kmem_cache_alloc(ip_vs_conn_cachep, GFP_ATOMIC);
        if (cp == NULL) {
                IP_VS_ERR_RL("%s(): no memory\n", __func__);
                return NULL;
@@ -872,13 +872,13 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p,
        ip_vs_conn_net_set(cp, p->net);
        cp->af             = p->af;
        cp->protocol       = p->protocol;
-       ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
+       ip_vs_addr_set(p->af, &cp->caddr, p->caddr);
        cp->cport          = p->cport;
-       ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
+       ip_vs_addr_set(p->af, &cp->vaddr, p->vaddr);
        cp->vport          = p->vport;
        /* proto should only be IPPROTO_IP if d_addr is a fwmark */
-       ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
-                       &cp->daddr, daddr);
+       ip_vs_addr_set(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
+                      &cp->daddr, daddr);
        cp->dport          = dport;
        cp->flags          = flags;
        cp->fwmark         = fwmark;
@@ -887,6 +887,10 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p,
                cp->pe = p->pe;
                cp->pe_data = p->pe_data;
                cp->pe_data_len = p->pe_data_len;
+       } else {
+               cp->pe = NULL;
+               cp->pe_data = NULL;
+               cp->pe_data_len = 0;
        }
        spin_lock_init(&cp->lock);
 
@@ -897,18 +901,28 @@ ip_vs_conn_new(const struct ip_vs_conn_param *p,
         */
        atomic_set(&cp->refcnt, 1);
 
+       cp->control = NULL;
        atomic_set(&cp->n_control, 0);
        atomic_set(&cp->in_pkts, 0);
 
+       cp->packet_xmit = NULL;
+       cp->app = NULL;
+       cp->app_data = NULL;
+       /* reset struct ip_vs_seq */
+       cp->in_seq.delta = 0;
+       cp->out_seq.delta = 0;
+
        atomic_inc(&ipvs->conn_count);
        if (flags & IP_VS_CONN_F_NO_CPORT)
                atomic_inc(&ip_vs_conn_no_cport_cnt);
 
        /* Bind the connection with a destination server */
+       cp->dest = NULL;
        ip_vs_bind_dest(cp, dest);
 
        /* Set its state and timeout */
        cp->state = 0;
+       cp->old_state = 0;
        cp->timeout = 3*HZ;
        cp->sync_endtime = jiffies & ~3UL;
 
-- 
1.7.10.4

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