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Date: Fri, 4 Dec 2009 00:31:37 +0200
From: Octavian Purdila <opurdila@...acom.com>
To: opurdila@...acom.com, netdev@...r.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH 3/4] llc: use a device based hash table to speed up multicast delivery
This patch adds a per SAP device based hash table to solve the
multicast delivery scalability issues for the case where the are a
large number of interfaces and a large number of sockets (bound to the
same SAP) are used.
Signed-off-by: Octavian Purdila <opurdila@...acom.com>
---
include/net/llc.h | 20 ++++++++++++++++----
include/net/llc_conn.h | 1 +
net/llc/llc_conn.c | 18 +++++++++++++++++-
net/llc/llc_core.c | 3 +++
net/llc/llc_sap.c | 11 ++++++-----
5 files changed, 43 insertions(+), 10 deletions(-)
diff --git a/include/net/llc.h b/include/net/llc.h
index 7940da1..31e9902 100644
--- a/include/net/llc.h
+++ b/include/net/llc.h
@@ -31,6 +31,14 @@ struct llc_addr {
#define LLC_SAP_STATE_INACTIVE 1
#define LLC_SAP_STATE_ACTIVE 2
+#define LLC_SK_DEV_HASH_BITS 10
+#define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS)
+
+struct llc_sk_list {
+ rwlock_t lock;
+ struct hlist_head list;
+};
+
/**
* struct llc_sap - Defines the SAP component
*
@@ -53,12 +61,16 @@ struct llc_sap {
struct net_device *orig_dev);
struct llc_addr laddr;
struct list_head node;
- struct {
- rwlock_t lock;
- struct hlist_head list;
- } sk_list;
+ struct llc_sk_list sk_list;
+ struct llc_sk_list sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES];
};
+static inline
+struct llc_sk_list *llc_sk_dev_hash(struct llc_sap *sap, int ifindex)
+{
+ return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES];
+}
+
#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */
#define LLC_DEST_SAP 1 /* Type 1 goes here */
#define LLC_DEST_CONN 2 /* Type 2 goes here */
diff --git a/include/net/llc_conn.h b/include/net/llc_conn.h
index fe982fd..2f97d8d 100644
--- a/include/net/llc_conn.h
+++ b/include/net/llc_conn.h
@@ -77,6 +77,7 @@ struct llc_sock {
received and caused sending FRMR.
Used for resending FRMR */
u32 cmsg_flags;
+ struct hlist_node dev_hash_node;
};
static inline struct llc_sock *llc_sk(const struct sock *sk)
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index c6bab39..c3f47ec 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -651,11 +651,19 @@ static int llc_find_offset(int state, int ev_type)
*/
void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
{
+ struct llc_sock *llc = llc_sk(sk);
+ struct llc_sk_list *dev_hb = llc_sk_dev_hash(sap, llc->dev->ifindex);
+
llc_sap_hold(sap);
+ llc->sap = sap;
+
write_lock_bh(&sap->sk_list.lock);
- llc_sk(sk)->sap = sap;
sk_add_node(sk, &sap->sk_list.list);
write_unlock_bh(&sap->sk_list.lock);
+
+ write_lock_bh(&dev_hb->lock);
+ hlist_add_head(&llc->dev_hash_node, &dev_hb->list);
+ write_unlock_bh(&dev_hb->lock);
}
/**
@@ -668,9 +676,17 @@ void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
*/
void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
{
+ struct llc_sock *llc = llc_sk(sk);
+ struct llc_sk_list *dev_hb = llc_sk_dev_hash(sap, llc->dev->ifindex);
+
write_lock_bh(&sap->sk_list.lock);
sk_del_node_init(sk);
write_unlock_bh(&sap->sk_list.lock);
+
+ write_lock_bh(&dev_hb->lock);
+ hlist_del(&llc->dev_hash_node);
+ write_unlock_bh(&dev_hb->lock);
+
llc_sap_put(sap);
}
diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c
index ff4c0ab..1d79cda 100644
--- a/net/llc/llc_core.c
+++ b/net/llc/llc_core.c
@@ -33,12 +33,15 @@ DEFINE_RWLOCK(llc_sap_list_lock);
static struct llc_sap *llc_sap_alloc(void)
{
struct llc_sap *sap = kzalloc(sizeof(*sap), GFP_ATOMIC);
+ int i;
if (sap) {
/* sap->laddr.mac - leave as a null, it's filled by bind */
sap->state = LLC_SAP_STATE_ACTIVE;
rwlock_init(&sap->sk_list.lock);
atomic_set(&sap->refcnt, 1);
+ for (i = 0; i < LLC_SK_DEV_HASH_ENTRIES; i++)
+ rwlock_init(&sap->sk_dev_hash[i].lock);
}
return sap;
}
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 008de1f..11bad55 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -340,12 +340,13 @@ static void llc_sap_mcast(struct llc_sap *sap,
const struct llc_addr *laddr,
struct sk_buff *skb)
{
- struct sock *sk;
+ struct llc_sock *llc;
struct hlist_node *node;
+ struct llc_sk_list *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex);
- read_lock_bh(&sap->sk_list.lock);
- sk_for_each(sk, node, &sap->sk_list.list) {
- struct llc_sock *llc = llc_sk(sk);
+ read_lock_bh(&dev_hb->lock);
+ hlist_for_each_entry(llc, node, &dev_hb->list, dev_hash_node) {
+ struct sock *sk = &llc->sk;
struct sk_buff *skb1;
if (sk->sk_type != SOCK_DGRAM)
@@ -365,7 +366,7 @@ static void llc_sap_mcast(struct llc_sap *sap,
llc_sap_rcv(sap, skb1, sk);
sock_put(sk);
}
- read_unlock_bh(&sap->sk_list.lock);
+ read_unlock_bh(&dev_hb->lock);
}
--
1.5.6.5
--
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