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authorEric Dumazet <edumazet@google.com>2014-03-18 07:20:49 +0400
committerDavid S. Miller <davem@davemloft.net>2014-03-18 22:17:55 +0400
commitd37d8ac17d38d389375060416ceedd5b19d5255c (patch)
treeebc4defe9fa6cef650f2c231a3cba5405928cede /net/sched/cls_fw.c
parent995dca4ce9dddf48597bd3e0427447acd4509f1d (diff)
downloadlinux-d37d8ac17d38d389375060416ceedd5b19d5255c.tar.xz
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>
Diffstat (limited to 'net/sched/cls_fw.c')
-rw-r--r--net/sched/cls_fw.c33
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,