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Date: Wed, 28 Nov 2007 13:53:36 -0500
From: Hideo AOKI <haoki@...hat.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
netdev <netdev@...r.kernel.org>
CC: David Miller <davem@...emloft.net>,
Satoshi Oshima <satoshi.oshima.fk@...achi.com>,
Bill Fink <billfink@...dspring.com>,
Andi Kleen <andi@...stfloor.org>,
Evgeniy Polyakov <johnpol@....mipt.ru>,
Stephen Hemminger <shemminger@...ux-foundation.org>,
yoshfuji@...ux-ipv6.org,
Yumiko Sugita <yumiko.sugita.yf@...achi.com>, haoki@...hat.com
Subject: [PATCH 4/4] udp: memory accounting in IPv4
This patch adds UDP memory usage accounting in IPv4.
Cc: Satoshi Oshima <satoshi.oshima.fk@...achi.com>
signed-off-by: Hideo Aoki <haoki@...hat.com>
---
af_inet.c | 30 +++++++++++++++++++++++++++++-
ip_output.c | 49 ++++++++++++++++++++++++++++++++++++++++++-------
udp.c | 16 ++++++++++++++++
3 files changed, 87 insertions(+), 8 deletions(-)
diff -pruN net-2.6-udp-take9a2-p3/net/ipv4/af_inet.c net-2.6-udp-take9a2-p4/net/ipv4/af_inet.c
--- net-2.6-udp-take9a2-p3/net/ipv4/af_inet.c 2007-11-28 12:11:02.000000000 -0500
+++ net-2.6-udp-take9a2-p4/net/ipv4/af_inet.c 2007-11-28 12:11:04.000000000 -0500
@@ -126,13 +126,41 @@ extern void ip_mc_drop_socket(struct soc
static struct list_head inetsw[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw_lock);
+/**
+ * __skb_queue_purge_and_sub_memory_allocated
+ * - empty a list and subtruct memory allocation counter
+ * @sk: sk
+ * @list: list to empty
+ * Delete all buffers on an &sk_buff list and subtruct the
+ * truesize of the sk_buff for memory accounting. Each buffer
+ * is removed from the list and one reference dropped. This
+ * function does not take the list lock and the caller must
+ * hold the relevant locks to use it.
+ */
+static inline void __skb_queue_purge_and_sub_memory_allocated(struct sock *sk,
+ struct sk_buff_head *list)
+{
+ struct sk_buff *skb;
+ int purged_skb_size = 0;
+ while ((skb = __skb_dequeue(list)) != NULL) {
+ purged_skb_size += sk_datagram_pages(skb->truesize);
+ kfree_skb(skb);
+ }
+ atomic_sub(purged_skb_size, sk->sk_prot->memory_allocated);
+}
+
/* New destruction routine */
void inet_sock_destruct(struct sock *sk)
{
struct inet_sock *inet = inet_sk(sk);
- __skb_queue_purge(&sk->sk_receive_queue);
+ if (sk->sk_prot->memory_allocated && sk->sk_type != SOCK_STREAM)
+ __skb_queue_purge_and_sub_memory_allocated(sk,
+ &sk->sk_receive_queue);
+ else
+ __skb_queue_purge(&sk->sk_receive_queue);
+
__skb_queue_purge(&sk->sk_error_queue);
if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
diff -pruN net-2.6-udp-take9a2-p3/net/ipv4/ip_output.c net-2.6-udp-take9a2-p4/net/ipv4/ip_output.c
--- net-2.6-udp-take9a2-p3/net/ipv4/ip_output.c 2007-11-27 11:11:37.000000000 -0500
+++ net-2.6-udp-take9a2-p4/net/ipv4/ip_output.c 2007-11-28 12:11:09.000000000 -0500
@@ -75,6 +75,7 @@
#include <net/icmp.h>
#include <net/checksum.h>
#include <net/inetpeer.h>
+#include <net/udp.h>
#include <linux/igmp.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_bridge.h>
@@ -707,16 +708,19 @@ static inline int ip_ufo_append_data(str
{
struct sk_buff *skb;
int err;
+ int size = 0;
/* There is support for UDP fragmentation offload by network
* device, so create one single skb packet containing complete
* udp datagram
*/
if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) {
- skb = sock_alloc_send_skb(sk,
- hh_len + fragheaderlen + transhdrlen + 20,
- (flags & MSG_DONTWAIT), &err);
+ size = hh_len + fragheaderlen + transhdrlen + 20;
+ if (!sk_wmem_schedule(sk, size))
+ return -ENOBUFS;
+ skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT),
+ &err);
if (skb == NULL)
return err;
@@ -737,8 +741,12 @@ static inline int ip_ufo_append_data(str
sk->sk_sndmsg_off = 0;
}
- err = skb_append_datato_frags(sk,skb, getfrag, from,
- (length - transhdrlen));
+ size = length - transhdrlen;
+ if (!sk_wmem_schedule(sk, size)) {
+ err = -ENOBUFS;
+ goto fail;
+ }
+ err = skb_append_datato_frags(sk, skb, getfrag, from, size);
if (!err) {
/* specify the length of each IP datagram fragment*/
skb_shinfo(skb)->gso_size = mtu - fragheaderlen;
@@ -750,6 +758,7 @@ static inline int ip_ufo_append_data(str
/* There is not enough support do UFO ,
* so follow normal path
*/
+fail:
kfree_skb(skb);
return err;
}
@@ -908,6 +917,12 @@ alloc_new_skb:
if (datalen == length + fraggap)
alloclen += rt->u.dst.trailer_len;
+ if (!sk_wmem_schedule(sk, alloclen + hh_len + 15 +
+ sizeof(struct sk_buff))) {
+ err = -ENOBUFS;
+ goto error;
+ }
+
if (transhdrlen) {
skb = sock_alloc_send_skb(sk,
alloclen + hh_len + 15,
@@ -1004,6 +1019,10 @@ alloc_new_skb:
frag = &skb_shinfo(skb)->frags[i];
}
} else if (i < MAX_SKB_FRAGS) {
+ if (!sk_wmem_schedule(sk, PAGE_SIZE)) {
+ err = -ENOBUFS;
+ goto error;
+ }
if (atomic_read(&sk->sk_wmem_alloc) + PAGE_SIZE
> 2 * sk->sk_sndbuf) {
err = -ENOBUFS;
@@ -1119,6 +1138,12 @@ ssize_t ip_append_page(struct sock *sk,
fraggap = skb_prev->len - maxfraglen;
alloclen = fragheaderlen + hh_len + fraggap + 15;
+
+ if (!sk_wmem_schedule(sk, alloclen +
+ sizeof(struct sk_buff))) {
+ err = -ENOBUFS;
+ goto error;
+ }
skb = sock_wmalloc(sk, alloclen, 1, sk->sk_allocation);
if (unlikely(!skb)) {
err = -ENOBUFS;
@@ -1213,13 +1238,14 @@ int ip_push_pending_frames(struct sock *
struct iphdr *iph;
__be16 df = 0;
__u8 ttl;
- int err = 0;
+ int err = 0, send_page_size;
if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL)
goto out;
tail_skb = &(skb_shinfo(skb)->frag_list);
/* move skb->data to ip header from ext header */
+ send_page_size = sk_datagram_pages(skb->truesize);
if (skb->data < skb_network_header(skb))
__skb_pull(skb, skb_network_offset(skb));
while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
@@ -1229,6 +1255,7 @@ int ip_push_pending_frames(struct sock *
skb->len += tmp_skb->len;
skb->data_len += tmp_skb->len;
skb->truesize += tmp_skb->truesize;
+ send_page_size += sk_datagram_pages(tmp_skb->truesize);
__sock_put(tmp_skb->sk);
tmp_skb->destructor = NULL;
tmp_skb->sk = NULL;
@@ -1284,6 +1311,8 @@ int ip_push_pending_frames(struct sock *
/* Netfilter gets whole the not fragmented skb. */
err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL,
skb->dst->dev, dst_output);
+ if (sk->sk_prot->memory_allocated)
+ atomic_sub(send_page_size, sk->sk_prot->memory_allocated);
if (err) {
if (err > 0)
err = inet->recverr ? net_xmit_errno(err) : 0;
@@ -1306,9 +1335,15 @@ error:
void ip_flush_pending_frames(struct sock *sk)
{
struct sk_buff *skb;
+ int num_flush_mem = 0;
- while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
+ while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
+ num_flush_mem += sk_datagram_pages(skb->truesize);
kfree_skb(skb);
+ }
+
+ if (sk->sk_prot->memory_allocated)
+ atomic_sub(num_flush_mem, sk->sk_prot->memory_allocated);
ip_cork_release(inet_sk(sk));
}
diff -pruN net-2.6-udp-take9a2-p3/net/ipv4/udp.c net-2.6-udp-take9a2-p4/net/ipv4/udp.c
--- net-2.6-udp-take9a2-p3/net/ipv4/udp.c 2007-11-28 12:11:02.000000000 -0500
+++ net-2.6-udp-take9a2-p4/net/ipv4/udp.c 2007-11-28 12:11:09.000000000 -0500
@@ -833,6 +833,7 @@ int udp_recvmsg(struct kiocb *iocb, stru
unsigned int ulen, copied;
int err;
int is_udplite = IS_UDPLITE(sk);
+ int truesize;
/*
* Check any passed addresses
@@ -897,14 +898,18 @@ try_again:
err = ulen;
out_free:
+ truesize = skb->truesize;
skb_free_datagram(sk, skb);
+ atomic_sub(sk_datagram_pages(truesize), sk->sk_prot->memory_allocated);
out:
return err;
csum_copy_err:
UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
+ truesize = skb->truesize;
skb_kill_datagram(sk, skb, flags);
+ atomic_sub(sk_datagram_pages(truesize), sk->sk_prot->memory_allocated);
if (noblock)
return -EAGAIN;
@@ -946,6 +951,7 @@ int udp_queue_rcv_skb(struct sock * sk,
{
struct udp_sock *up = udp_sk(sk);
int rc;
+ int scheduled = 0;
/*
* Charge it to the socket, dropping if the queue is full.
@@ -1022,6 +1028,13 @@ int udp_queue_rcv_skb(struct sock * sk,
goto drop;
}
+ if (sk_datagram_rmem_schedule(sk, skb))
+ scheduled = skb->truesize;
+ else {
+ UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
+ goto drop;
+ }
+
if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
/* Note that an ENOMEM error is charged twice */
if (rc == -ENOMEM)
@@ -1035,6 +1048,9 @@ int udp_queue_rcv_skb(struct sock * sk,
drop:
UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
kfree_skb(skb);
+ if (scheduled)
+ atomic_sub(sk_datagram_pages(scheduled),
+ sk->sk_prot->memory_allocated);
return -1;
}
--
Hitachi Computer Products (America) Inc.
-
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