Merge branch 'inet-frags-next'

Nikolay Aleksandrov says:

====================
inet: frags: cleanup and kmem_cache use

This patchset does a couple of small cleanups in patches 1-5 and then in
patch 06 it introduces the use of kmem_cache for allocation/freeing of
inet_frag_queue+header objects.

v2: Broke up patch 02 into 3 patches as David suggested

Here are the results of a couple of netperf runs:
netperf options: -l 30 -I95,5 -i 15,10 -m 64k

- 10 gig before the patchset
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.155.1 () port 0 AF_INET : +/-2.500% @ 95% conf.
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   64000   30.00      442466      0    7551.39
212992           30.00      439130           7494.45

- 10 gig after the patchset
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.155.1 () port 0 AF_INET : +/-2.500% @ 95% conf.
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   64000   30.00      458846      0    7830.94
212992           30.00      457575           7809.25

- Virtio before the patchset
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.144.1 () port 0 AF_INET : +/-2.500% @ 95% conf.
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   64000   30.00      735000      0    12543.96
212992           30.00      560322           9562.79

- Virtio after the patchset
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.144.1 () port 0 AF_INET : +/-2.500% @ 95% conf.
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   64000   30.00      731729      0    12488.14
212992           30.00      647241           11046.21
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 12 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 6f4930a0b660..65a8855e99fe 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -15,25 +15,49 @@ struct netns_frags {
 	int			low_thresh;
 };
 
+/**
+ * fragment queue flags
+ *
+ * @INET_FRAG_FIRST_IN: first fragment has arrived
+ * @INET_FRAG_LAST_IN: final fragment has arrived
+ * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction
+ * @INET_FRAG_EVICTED: frag queue is being evicted
+ */
+enum {
+	INET_FRAG_FIRST_IN	= BIT(0),
+	INET_FRAG_LAST_IN	= BIT(1),
+	INET_FRAG_COMPLETE	= BIT(2),
+	INET_FRAG_EVICTED	= BIT(3)
+};
+
+/**
+ * struct inet_frag_queue - fragment queue
+ *
+ * @lock: spinlock protecting the queue
+ * @timer: queue expiration timer
+ * @list: hash bucket list
+ * @refcnt: reference count of the queue
+ * @fragments: received fragments head
+ * @fragments_tail: received fragments tail
+ * @stamp: timestamp of the last received fragment
+ * @len: total length of the original datagram
+ * @meat: length of received fragments so far
+ * @flags: fragment queue flags
+ * @max_size: (ipv4 only) maximum received fragment size with IP_DF set
+ * @net: namespace that this frag belongs to
+ */
 struct inet_frag_queue {
 	spinlock_t		lock;
-	struct timer_list	timer;      /* when will this queue expire? */
+	struct timer_list	timer;
 	struct hlist_node	list;
 	atomic_t		refcnt;
-	struct sk_buff		*fragments; /* list of received fragments */
+	struct sk_buff		*fragments;
 	struct sk_buff		*fragments_tail;
 	ktime_t			stamp;
-	int			len;        /* total length of orig datagram */
+	int			len;
 	int			meat;
-	__u8			last_in;    /* first/last segment arrived? */
-
-#define INET_FRAG_EVICTED	8
-#define INET_FRAG_COMPLETE	4
-#define INET_FRAG_FIRST_IN	2
-#define INET_FRAG_LAST_IN	1
-
+	__u8			flags;
 	u16			max_size;
-
 	struct netns_frags	*net;
 };
 
@@ -77,9 +101,11 @@ struct inet_frags {
 	void			(*destructor)(struct inet_frag_queue *);
 	void			(*skb_free)(struct sk_buff *);
 	void			(*frag_expire)(unsigned long data);
+	struct kmem_cache	*frags_cachep;
+	const char		*frags_cache_name;
 };
 
-void inet_frags_init(struct inet_frags *);
+int inet_frags_init(struct inet_frags *);
 void inet_frags_fini(struct inet_frags *);
 
 void inet_frags_init_net(struct netns_frags *nf);