net: sched: use no more than one page in struct fw_head

In commit b4e9b520ca5d ("[NET_SCHED]: Add mask support to fwmark
classifier") Patrick added an u32 field in fw_head, making it slightly
bigger than one page.

Lets use 256 slots to make fw_hash() more straight forward, and move
@mask to the beginning of the structure as we often use a small number
of skb->mark. @mask and first hash buckets share the same cache line.

This brings back the memory usage to less than 4000 bytes, and permits
John to add a rcu_head at the end of the structure later without any
worry.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Thomas Graf <tgraf@suug.ch>
Cc: John Fastabend <john.fastabend@gmail.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 26 deletions

diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index a366537f82c6..63a3ce75c02e 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -29,11 +29,11 @@
 #include <net/act_api.h>
 #include <net/pkt_cls.h>
 
-#define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
+#define HTSIZE 256
 
 struct fw_head {
-        struct fw_filter *ht[HTSIZE];
-        u32 mask;
+        u32                     mask;
+        struct fw_filter        *ht[HTSIZE];
 };
 
 struct fw_filter {
@@ -46,30 +46,11 @@ struct fw_filter {
         struct tcf_exts         exts;
 };
 
-static inline int fw_hash(u32 handle)
+static u32 fw_hash(u32 handle)
 {
-        if (HTSIZE == 4096)
-                return ((handle >> 24) & 0xFFF) ^
-                       ((handle >> 12) & 0xFFF) ^
-                       (handle & 0xFFF);
-        else if (HTSIZE == 2048)
-                return ((handle >> 22) & 0x7FF) ^
-                       ((handle >> 11) & 0x7FF) ^
-                       (handle & 0x7FF);
-        else if (HTSIZE == 1024)
-                return ((handle >> 20) & 0x3FF) ^
-                       ((handle >> 10) & 0x3FF) ^
-                       (handle & 0x3FF);
-        else if (HTSIZE == 512)
-                return (handle >> 27) ^
-                       ((handle >> 18) & 0x1FF) ^
-                       ((handle >> 9) & 0x1FF) ^
-                       (handle & 0x1FF);
-        else if (HTSIZE == 256) {
-                u8 *t = (u8 *) &handle;
-                return t[0] ^ t[1] ^ t[2] ^ t[3];
-        } else
-                return handle & (HTSIZE - 1);
+        handle ^= (handle >> 16);
+        handle ^= (handle >> 8);
+        return handle % HTSIZE;
 }
 
 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,