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Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c91
1 files changed, 56 insertions, 35 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 34f5db1e1c8..22ef5f9fd2f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -282,11 +282,9 @@ int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT;
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
-long sysctl_tcp_mem[3] __read_mostly;
int sysctl_tcp_wmem[3] __read_mostly;
int sysctl_tcp_rmem[3] __read_mostly;
-EXPORT_SYMBOL(sysctl_tcp_mem);
EXPORT_SYMBOL(sysctl_tcp_rmem);
EXPORT_SYMBOL(sysctl_tcp_wmem);
@@ -888,18 +886,18 @@ int tcp_sendpage(struct sock *sk, struct page *page, int offset,
}
EXPORT_SYMBOL(tcp_sendpage);
-#define TCP_PAGE(sk) (sk->sk_sndmsg_page)
-#define TCP_OFF(sk) (sk->sk_sndmsg_off)
-
-static inline int select_size(const struct sock *sk, int sg)
+static inline int select_size(const struct sock *sk, bool sg)
{
const struct tcp_sock *tp = tcp_sk(sk);
int tmp = tp->mss_cache;
if (sg) {
- if (sk_can_gso(sk))
- tmp = 0;
- else {
+ if (sk_can_gso(sk)) {
+ /* Small frames wont use a full page:
+ * Payload will immediately follow tcp header.
+ */
+ tmp = SKB_WITH_OVERHEAD(2048 - MAX_TCP_HEADER);
+ } else {
int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER);
if (tmp >= pgbreak &&
@@ -917,9 +915,9 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct iovec *iov;
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
- int iovlen, flags;
+ int iovlen, flags, err, copied;
int mss_now, size_goal;
- int sg, err, copied;
+ bool sg;
long timeo;
lock_sock(sk);
@@ -946,7 +944,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
goto out_err;
- sg = sk->sk_route_caps & NETIF_F_SG;
+ sg = !!(sk->sk_route_caps & NETIF_F_SG);
while (--iovlen >= 0) {
size_t seglen = iov->iov_len;
@@ -1005,8 +1003,13 @@ new_segment:
} else {
int merge = 0;
int i = skb_shinfo(skb)->nr_frags;
- struct page *page = TCP_PAGE(sk);
- int off = TCP_OFF(sk);
+ struct page *page = sk->sk_sndmsg_page;
+ int off;
+
+ if (page && page_count(page) == 1)
+ sk->sk_sndmsg_off = 0;
+
+ off = sk->sk_sndmsg_off;
if (skb_can_coalesce(skb, i, page, off) &&
off != PAGE_SIZE) {
@@ -1023,7 +1026,7 @@ new_segment:
} else if (page) {
if (off == PAGE_SIZE) {
put_page(page);
- TCP_PAGE(sk) = page = NULL;
+ sk->sk_sndmsg_page = page = NULL;
off = 0;
}
} else
@@ -1049,9 +1052,9 @@ new_segment:
/* If this page was new, give it to the
* socket so it does not get leaked.
*/
- if (!TCP_PAGE(sk)) {
- TCP_PAGE(sk) = page;
- TCP_OFF(sk) = 0;
+ if (!sk->sk_sndmsg_page) {
+ sk->sk_sndmsg_page = page;
+ sk->sk_sndmsg_off = 0;
}
goto do_error;
}
@@ -1061,15 +1064,15 @@ new_segment:
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
} else {
skb_fill_page_desc(skb, i, page, off, copy);
- if (TCP_PAGE(sk)) {
+ if (sk->sk_sndmsg_page) {
get_page(page);
} else if (off + copy < PAGE_SIZE) {
get_page(page);
- TCP_PAGE(sk) = page;
+ sk->sk_sndmsg_page = page;
}
}
- TCP_OFF(sk) = off + copy;
+ sk->sk_sndmsg_off = off + copy;
}
if (!copied)
@@ -1873,6 +1876,20 @@ void tcp_shutdown(struct sock *sk, int how)
}
EXPORT_SYMBOL(tcp_shutdown);
+bool tcp_check_oom(struct sock *sk, int shift)
+{
+ bool too_many_orphans, out_of_socket_memory;
+
+ too_many_orphans = tcp_too_many_orphans(sk, shift);
+ out_of_socket_memory = tcp_out_of_memory(sk);
+
+ if (too_many_orphans && net_ratelimit())
+ pr_info("TCP: too many orphaned sockets\n");
+ if (out_of_socket_memory && net_ratelimit())
+ pr_info("TCP: out of memory -- consider tuning tcp_mem\n");
+ return too_many_orphans || out_of_socket_memory;
+}
+
void tcp_close(struct sock *sk, long timeout)
{
struct sk_buff *skb;
@@ -2012,10 +2029,7 @@ adjudge_to_death:
}
if (sk->sk_state != TCP_CLOSE) {
sk_mem_reclaim(sk);
- if (tcp_too_many_orphans(sk, 0)) {
- if (net_ratelimit())
- printk(KERN_INFO "TCP: too many of orphaned "
- "sockets\n");
+ if (tcp_check_oom(sk, 0)) {
tcp_set_state(sk, TCP_CLOSE);
tcp_send_active_reset(sk, GFP_ATOMIC);
NET_INC_STATS_BH(sock_net(sk),
@@ -2653,7 +2667,8 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
EXPORT_SYMBOL(compat_tcp_getsockopt);
#endif
-struct sk_buff *tcp_tso_segment(struct sk_buff *skb, u32 features)
+struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
+ netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
struct tcphdr *th;
@@ -3212,11 +3227,21 @@ static int __init set_thash_entries(char *str)
}
__setup("thash_entries=", set_thash_entries);
+void tcp_init_mem(struct net *net)
+{
+ unsigned long limit = nr_free_buffer_pages() / 8;
+ limit = max(limit, 128UL);
+ net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
+ net->ipv4.sysctl_tcp_mem[1] = limit;
+ net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+}
+
void __init tcp_init(void)
{
struct sk_buff *skb = NULL;
unsigned long limit;
- int i, max_share, cnt;
+ int max_share, cnt;
+ unsigned int i;
unsigned long jiffy = jiffies;
BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));
@@ -3259,7 +3284,7 @@ void __init tcp_init(void)
&tcp_hashinfo.bhash_size,
NULL,
64 * 1024);
- tcp_hashinfo.bhash_size = 1 << tcp_hashinfo.bhash_size;
+ tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size;
for (i = 0; i < tcp_hashinfo.bhash_size; i++) {
spin_lock_init(&tcp_hashinfo.bhash[i].lock);
INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain);
@@ -3272,14 +3297,10 @@ void __init tcp_init(void)
sysctl_tcp_max_orphans = cnt / 2;
sysctl_max_syn_backlog = max(128, cnt / 256);
- limit = nr_free_buffer_pages() / 8;
- limit = max(limit, 128UL);
- sysctl_tcp_mem[0] = limit / 4 * 3;
- sysctl_tcp_mem[1] = limit;
- sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2;
-
+ tcp_init_mem(&init_net);
/* Set per-socket limits to no more than 1/128 the pressure threshold */
- limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7);
+ limit = nr_free_buffer_pages() << (PAGE_SHIFT - 10);
+ limit = max(limit, 128UL);
max_share = min(4UL*1024*1024, limit);
sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-21 12:19:38 +0000