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xfrm interface: store xfrmi contexts in a hash by if_id

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xfrmi_lookup() is called on every packet. Using a single list for
looking up if_id becomes a bottleneck when having many xfrm interfaces.

Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Eyal Birger 2020-07-09 13:16:52 +03:00 committed by Steffen Klassert
parent 2749c69734
commit e98e44562b
1 changed files with 20 additions and 9 deletions
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29
net/xfrm/xfrm_interface.c
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@ -49,20 +49,28 @@ static struct rtnl_link_ops xfrmi_link_ops __read_mostly;
static unsigned int xfrmi_net_id __read_mostly;
static const struct net_device_ops xfrmi_netdev_ops;
#define XFRMI_HASH_BITS 8
#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS)
struct xfrmi_net {
/* lists for storing interfaces in use */
struct xfrm_if __rcu *xfrmi[1];
struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE];
};
#define for_each_xfrmi_rcu(start, xi) \
for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next))
static u32 xfrmi_hash(u32 if_id)
{
return hash_32(if_id, XFRMI_HASH_BITS);
}
static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
{
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
struct xfrm_if *xi;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) {
if (x->if_id == xi->p.if_id &&
(xi->dev->flags & IFF_UP))
return xi;
@ -107,7 +115,7 @@ static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb,
static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
{
struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0];
struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
rcu_assign_pointer(xi->next , rtnl_dereference(*xip));
rcu_assign_pointer(*xip, xi);
@ -118,7 +126,7 @@ static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi)
struct xfrm_if __rcu **xip;
struct xfrm_if *iter;
for (xip = &xfrmn->xfrmi[0];
for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)];
(iter = rtnl_dereference(*xip)) != NULL;
xip = &iter->next) {
if (xi == iter) {
@ -162,7 +170,7 @@ static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p)
struct xfrm_if *xi;
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
for (xip = &xfrmn->xfrmi[0];
for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)];
(xi = rtnl_dereference(*xip)) != NULL;
xip = &xi->next)
if (xi->p.if_id == p->if_id)
@ -761,11 +769,14 @@ static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list)
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
struct xfrm_if __rcu **xip;
struct xfrm_if *xi;
int i;
for (xip = &xfrmn->xfrmi[0];
(xi = rtnl_dereference(*xip)) != NULL;
xip = &xi->next)
unregister_netdevice_queue(xi->dev, &list);
for (i = 0; i < XFRMI_HASH_SIZE; i++) {
for (xip = &xfrmn->xfrmi[i];
(xi = rtnl_dereference(*xip)) != NULL;
xip = &xi->next)
unregister_netdevice_queue(xi->dev, &list);
}
}
unregister_netdevice_many(&list);
rtnl_unlock();