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Message-Id: <20241031124550.20227-3-lulie@linux.alibaba.com>
Date: Thu, 31 Oct 2024 20:45:48 +0800
From: Philo Lu <lulie@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: willemdebruijn.kernel@...il.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
dsahern@...nel.org,
horms@...nel.org,
antony.antony@...unet.com,
steffen.klassert@...unet.com,
linux-kernel@...r.kernel.org,
dust.li@...ux.alibaba.com,
jakub@...udflare.com,
fred.cc@...baba-inc.com,
yubing.qiuyubing@...baba-inc.com
Subject: [PATCH v6 net-next 2/4] net/udp: Add 4-tuple hash list basis
Add a new hash list, hash4, in udp table. It will be used to implement
4-tuple hash for connected udp sockets. This patch adds the hlist to
table, and implements helpers and the initialization. 4-tuple hash is
implemented in the following patch.
hash4 uses hlist_nulls to avoid moving wrongly onto another hlist due to
concurrent rehash, because rehash() can happen with lookup().
Signed-off-by: Philo Lu <lulie@...ux.alibaba.com>
Signed-off-by: Cambda Zhu <cambda@...ux.alibaba.com>
Signed-off-by: Fred Chen <fred.cc@...baba-inc.com>
Signed-off-by: Yubing Qiu <yubing.qiuyubing@...baba-inc.com>
---
include/linux/udp.h | 11 ++++++
include/net/udp.h | 85 +++++++++++++++++++++++++++++++++++++++++++--
net/ipv4/udp.c | 6 ++--
3 files changed, 97 insertions(+), 5 deletions(-)
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 3eb3f2b9a2a0..0807e21cfec9 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -56,6 +56,12 @@ struct udp_sock {
int pending; /* Any pending frames ? */
__u8 encap_type; /* Is this an Encapsulation socket? */
+#if !IS_ENABLED(CONFIG_BASE_SMALL)
+ /* For UDP 4-tuple hash */
+ __u16 udp_lrpa_hash;
+ struct hlist_nulls_node udp_lrpa_node;
+#endif
+
/*
* Following member retains the information to create a UDP header
* when the socket is uncorked.
@@ -206,6 +212,11 @@ static inline void udp_allow_gso(struct sock *sk)
#define udp_portaddr_for_each_entry_rcu(__sk, list) \
hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
+#if !IS_ENABLED(CONFIG_BASE_SMALL)
+#define udp_lrpa_for_each_entry_rcu(__up, node, list) \
+ hlist_nulls_for_each_entry_rcu(__up, node, list, udp_lrpa_node)
+#endif
+
#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)
#endif /* _LINUX_UDP_H */
diff --git a/include/net/udp.h b/include/net/udp.h
index f4e04616c27f..23a1a8198e16 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -50,14 +50,21 @@ struct udp_skb_cb {
#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
/**
- * struct udp_hslot - UDP hash slot used by udp_table.hash
+ * struct udp_hslot - UDP hash slot used by udp_table.hash/hash4
*
* @head: head of list of sockets
+ * @nulls_head: head of list of sockets, only used by hash4
* @count: number of sockets in 'head' list
* @lock: spinlock protecting changes to head/count
*/
struct udp_hslot {
- struct hlist_head head;
+ union {
+ struct hlist_head head;
+ /* hash4 uses hlist_nulls to avoid moving wrongly onto another hlist due to
+ * concurrent rehash, because rehash() can happen with lookup().
+ */
+ struct hlist_nulls_head nulls_head;
+ };
int count;
spinlock_t lock;
} __aligned(2 * sizeof(long));
@@ -81,12 +88,17 @@ struct udp_hslot_main {
*
* @hash: hash table, sockets are hashed on (local port)
* @hash2: hash table, sockets are hashed on (local port, local address)
+ * @hash4: hash table, connected sockets are hashed on
+ * (local port, local address, remote port, remote address)
* @mask: number of slots in hash tables, minus 1
* @log: log2(number of slots in hash table)
*/
struct udp_table {
struct udp_hslot *hash;
struct udp_hslot_main *hash2;
+#if !IS_ENABLED(CONFIG_BASE_SMALL)
+ struct udp_hslot *hash4;
+#endif
unsigned int mask;
unsigned int log;
};
@@ -113,13 +125,80 @@ static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
static inline void udp_table_hash4_init(struct udp_table *table)
{
}
+
+static inline struct udp_hslot *udp_hashslot4(struct udp_table *table,
+ unsigned int hash)
+{
+ BUILD_BUG();
+ return NULL;
+}
+
+static inline bool udp_hashed4(const struct sock *sk)
+{
+ return false;
+}
+
+static inline unsigned int udp_hash4_slot_size(void)
+{
+ return 0;
+}
+
+static inline bool udp_has_hash4(const struct udp_hslot *hslot2)
+{
+ return false;
+}
+
+static inline void udp_hash4_inc(struct udp_hslot *hslot2)
+{
+}
+
+static inline void udp_hash4_dec(struct udp_hslot *hslot2)
+{
+}
#else /* !CONFIG_BASE_SMALL */
/* Must be called with table->hash2 initialized */
static inline void udp_table_hash4_init(struct udp_table *table)
{
- for (int i = 0; i <= table->mask; i++)
+ table->hash4 = (void *)(table->hash2 + (table->mask + 1));
+ for (int i = 0; i <= table->mask; i++) {
table->hash2[i].hash4_cnt = 0;
+
+ INIT_HLIST_NULLS_HEAD(&table->hash4[i].nulls_head, i);
+ table->hash4[i].count = 0;
+ spin_lock_init(&table->hash4[i].lock);
+ }
+}
+
+static inline struct udp_hslot *udp_hashslot4(struct udp_table *table,
+ unsigned int hash)
+{
+ return &table->hash4[hash & table->mask];
+}
+
+static inline bool udp_hashed4(const struct sock *sk)
+{
+ return !hlist_nulls_unhashed(&udp_sk(sk)->udp_lrpa_node);
+}
+
+static inline unsigned int udp_hash4_slot_size(void)
+{
+ return sizeof(struct udp_hslot);
+}
+
+static inline bool udp_has_hash4(const struct udp_hslot *hslot2)
+{
+ return UDP_HSLOT_MAIN(hslot2)->hash4_cnt;
+}
+
+static inline void udp_hash4_inc(struct udp_hslot *hslot2)
+{
+ UDP_HSLOT_MAIN(hslot2)->hash4_cnt++;
+}
+
+static inline void udp_hash4_dec(struct udp_hslot *hslot2)
+{
+ UDP_HSLOT_MAIN(hslot2)->hash4_cnt--;
}
#endif /* CONFIG_BASE_SMALL */
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2fdac5fae2a8..0bc0881d6569 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -3427,7 +3427,8 @@ void __init udp_table_init(struct udp_table *table, const char *name)
{
unsigned int i, slot_size;
- slot_size = sizeof(struct udp_hslot) + sizeof(struct udp_hslot_main);
+ slot_size = sizeof(struct udp_hslot) + sizeof(struct udp_hslot_main) +
+ udp_hash4_slot_size();
table->hash = alloc_large_system_hash(name,
slot_size,
uhash_entries,
@@ -3482,7 +3483,8 @@ static struct udp_table __net_init *udp_pernet_table_alloc(unsigned int hash_ent
if (!udptable)
goto out;
- slot_size = sizeof(struct udp_hslot) + sizeof(struct udp_hslot_main);
+ slot_size = sizeof(struct udp_hslot) + sizeof(struct udp_hslot_main) +
+ udp_hash4_slot_size();
udptable->hash = vmalloc_huge(hash_entries * slot_size,
GFP_KERNEL_ACCOUNT);
if (!udptable->hash)
--
2.32.0.3.g01195cf9f
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