提交 eaa72dc4 编写于 作者: E Eric Dumazet 提交者: David S. Miller

neigh: increase queue_len_bytes to match wmem_default

Florian reported UDP xmit drops that could be root caused to the
too small neigh limit.

Current limit is 64 KB, meaning that even a single UDP socket would hit
it, since its default sk_sndbuf comes from net.core.wmem_default
(~212992 bytes on 64bit arches).

Once ARP/ND resolution is in progress, we should allow a little more
packets to be queued, at least for one producer.

Once neigh arp_queue is filled, a rogue socket should hit its sk_sndbuf
limit and either block in sendmsg() or return -EAGAIN.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Reported-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 0dd5759d
...@@ -109,7 +109,10 @@ neigh/default/unres_qlen_bytes - INTEGER ...@@ -109,7 +109,10 @@ neigh/default/unres_qlen_bytes - INTEGER
queued for each unresolved address by other network layers. queued for each unresolved address by other network layers.
(added in linux 3.3) (added in linux 3.3)
Setting negative value is meaningless and will return error. Setting negative value is meaningless and will return error.
Default: 65536 Bytes(64KB) Default: SK_WMEM_MAX, (same as net.core.wmem_default).
Exact value depends on architecture and kernel options,
but should be enough to allow queuing 256 packets
of medium size.
neigh/default/unres_qlen - INTEGER neigh/default/unres_qlen - INTEGER
The maximum number of packets which may be queued for each The maximum number of packets which may be queued for each
...@@ -119,7 +122,7 @@ neigh/default/unres_qlen - INTEGER ...@@ -119,7 +122,7 @@ neigh/default/unres_qlen - INTEGER
unexpected packet loss. The current default value is calculated unexpected packet loss. The current default value is calculated
according to default value of unres_qlen_bytes and true size of according to default value of unres_qlen_bytes and true size of
packet. packet.
Default: 31 Default: 101
mtu_expires - INTEGER mtu_expires - INTEGER
Time, in seconds, that cached PMTU information is kept. Time, in seconds, that cached PMTU information is kept.
......
...@@ -2368,6 +2368,16 @@ bool sk_net_capable(const struct sock *sk, int cap); ...@@ -2368,6 +2368,16 @@ bool sk_net_capable(const struct sock *sk, int cap);
void sk_get_meminfo(const struct sock *sk, u32 *meminfo); void sk_get_meminfo(const struct sock *sk, u32 *meminfo);
/* Take into consideration the size of the struct sk_buff overhead in the
* determination of these values, since that is non-constant across
* platforms. This makes socket queueing behavior and performance
* not depend upon such differences.
*/
#define _SK_MEM_PACKETS 256
#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
extern __u32 sysctl_wmem_max; extern __u32 sysctl_wmem_max;
extern __u32 sysctl_rmem_max; extern __u32 sysctl_rmem_max;
......
...@@ -307,16 +307,6 @@ static struct lock_class_key af_wlock_keys[AF_MAX]; ...@@ -307,16 +307,6 @@ static struct lock_class_key af_wlock_keys[AF_MAX];
static struct lock_class_key af_elock_keys[AF_MAX]; static struct lock_class_key af_elock_keys[AF_MAX];
static struct lock_class_key af_kern_callback_keys[AF_MAX]; static struct lock_class_key af_kern_callback_keys[AF_MAX];
/* Take into consideration the size of the struct sk_buff overhead in the
* determination of these values, since that is non-constant across
* platforms. This makes socket queueing behavior and performance
* not depend upon such differences.
*/
#define _SK_MEM_PACKETS 256
#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
/* Run time adjustable parameters. */ /* Run time adjustable parameters. */
__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
EXPORT_SYMBOL(sysctl_wmem_max); EXPORT_SYMBOL(sysctl_wmem_max);
......
...@@ -94,7 +94,7 @@ struct neigh_table dn_neigh_table = { ...@@ -94,7 +94,7 @@ struct neigh_table dn_neigh_table = {
[NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ, [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
[NEIGH_VAR_GC_STALETIME] = 60 * HZ, [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
[NEIGH_VAR_QUEUE_LEN_BYTES] = 64*1024, [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
[NEIGH_VAR_PROXY_QLEN] = 0, [NEIGH_VAR_PROXY_QLEN] = 0,
[NEIGH_VAR_ANYCAST_DELAY] = 0, [NEIGH_VAR_ANYCAST_DELAY] = 0,
[NEIGH_VAR_PROXY_DELAY] = 0, [NEIGH_VAR_PROXY_DELAY] = 0,
......
...@@ -171,7 +171,7 @@ struct neigh_table arp_tbl = { ...@@ -171,7 +171,7 @@ struct neigh_table arp_tbl = {
[NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ, [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
[NEIGH_VAR_GC_STALETIME] = 60 * HZ, [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
[NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
[NEIGH_VAR_PROXY_QLEN] = 64, [NEIGH_VAR_PROXY_QLEN] = 64,
[NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
[NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
......
...@@ -6086,9 +6086,9 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, ...@@ -6086,9 +6086,9 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
struct net *net = sock_net(sk); struct net *net = sock_net(sk);
struct sock *fastopen_sk = NULL; struct sock *fastopen_sk = NULL;
struct dst_entry *dst = NULL;
struct request_sock *req; struct request_sock *req;
bool want_cookie = false; bool want_cookie = false;
struct dst_entry *dst;
struct flowi fl; struct flowi fl;
/* TW buckets are converted to open requests without /* TW buckets are converted to open requests without
......
...@@ -127,7 +127,7 @@ struct neigh_table nd_tbl = { ...@@ -127,7 +127,7 @@ struct neigh_table nd_tbl = {
[NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME,
[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
[NEIGH_VAR_GC_STALETIME] = 60 * HZ, [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
[NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
[NEIGH_VAR_PROXY_QLEN] = 64, [NEIGH_VAR_PROXY_QLEN] = 64,
[NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ,
[NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10,
......
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