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netlink: autosize skb lengthes 

One known problem with netlink is the fact that NLMSG_GOODSIZE is
really small on PAGE_SIZE==4096 architectures, and it is difficult
to know in advance what buffer size is used by the application.

This patch adds an automatic learning of the size.

First netlink message will still be limited to ~4K, but if user used
bigger buffers, then following messages will be able to use up to 16KB.

This speedups dump() operations by a large factor and should be safe
for legacy applications.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Thomas Graf <tgraf@suug.ch>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-03-07 12:02:33 -08:00 committed by David S. Miller
parent cd84ff4da1
commit 9063e21fb0
2 changed files with 27 additions and 1 deletions
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27
net/netlink/af_netlink.c
View File

@ -2343,6 +2343,11 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
}
#endif
/* Record the max length of recvmsg() calls for future allocations */
nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len);
nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len,
16384);
copied = data_skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
@ -2587,7 +2592,27 @@ static int netlink_dump(struct sock *sk)
if (!netlink_rx_is_mmaped(sk) &&
atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
goto errout_skb;
skb = netlink_alloc_skb(sk, alloc_size, nlk->portid, GFP_KERNEL);
/* NLMSG_GOODSIZE is small to avoid high order allocations being
* required, but it makes sense to _attempt_ a 16K bytes allocation
* to reduce number of system calls on dump operations, if user
* ever provided a big enough buffer.
*/
if (alloc_size < nlk->max_recvmsg_len) {
skb = netlink_alloc_skb(sk,
nlk->max_recvmsg_len,
nlk->portid,
GFP_KERNEL |
__GFP_NOWARN |
__GFP_NORETRY);
/* available room should be exact amount to avoid MSG_TRUNC */
if (skb)
skb_reserve(skb, skb_tailroom(skb) -
nlk->max_recvmsg_len);
}
if (!skb)
skb = netlink_alloc_skb(sk, alloc_size, nlk->portid,
GFP_KERNEL);
if (!skb)
goto errout_skb;
netlink_skb_set_owner_r(skb, sk);

1
net/netlink/af_netlink.h
View File

@ -31,6 +31,7 @@ struct netlink_sock {
u32 ngroups;
unsigned long *groups;
unsigned long state;
size_t max_recvmsg_len;
wait_queue_head_t wait;
bool cb_running;
struct netlink_callback cb;