Merge branch 'tipc_net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux

Paul Gortmaker says:

====================
Two relatively small cleanup patches here, plus a reimplementation
of the patch Neil had questions about[1] in the last development
cycle.

Tested on today's net-next, between 32 and 64 bit x86 machines using
the server/client in tipc-utils, as usual.

[1] http://patchwork.ozlabs.org/patch/204507/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 44 insertions, 59 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 9b4e4833a484..a9622b6cd916 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -43,7 +43,8 @@
 #define SS_LISTENING    -1      /* socket is listening */
 #define SS_READY        -2      /* socket is connectionless */
 
-#define OVERLOAD_LIMIT_BASE     10000
+#define CONN_OVERLOAD_LIMIT     ((TIPC_FLOW_CONTROL_WIN * 2 + 1) * \
+                                SKB_TRUESIZE(TIPC_MAX_USER_MSG_SIZE))
 #define CONN_TIMEOUT_DEFAULT    8000    /* default connect timeout = 8s */
 
 struct tipc_sock {
@@ -129,19 +130,6 @@ static void advance_rx_queue(struct sock *sk)
 }
 
 /**
- * discard_rx_queue - discard all buffers in socket receive queue
- *
- * Caller must hold socket lock
- */
-static void discard_rx_queue(struct sock *sk)
-{
-        struct sk_buff *buf;
-
-        while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
-                kfree_skb(buf);
-}
-
-/**
  * reject_rx_queue - reject all buffers in socket receive queue
  *
  * Caller must hold socket lock
@@ -215,7 +203,6 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol,
 
         sock_init_data(sock, sk);
         sk->sk_backlog_rcv = backlog_rcv;
-        sk->sk_rcvbuf = TIPC_FLOW_CONTROL_WIN * 2 * TIPC_MAX_USER_MSG_SIZE * 2;
         sk->sk_data_ready = tipc_data_ready;
         sk->sk_write_space = tipc_write_space;
         tipc_sk(sk)->p = tp_ptr;
@@ -292,7 +279,7 @@ static int release(struct socket *sock)
         res = tipc_deleteport(tport->ref);
 
         /* Discard any remaining (connection-based) messages in receive queue */
-        discard_rx_queue(sk);
+        __skb_queue_purge(&sk->sk_receive_queue);
 
         /* Reject any messages that accumulated in backlog queue */
         sock->state = SS_DISCONNECTING;
@@ -516,8 +503,7 @@ static int send_msg(struct kiocb *iocb, struct socket *sock,
         if (unlikely((m->msg_namelen < sizeof(*dest)) ||
                      (dest->family != AF_TIPC)))
                 return -EINVAL;
-        if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
-            (m->msg_iovlen > (unsigned int)INT_MAX))
+        if (total_len > TIPC_MAX_USER_MSG_SIZE)
                 return -EMSGSIZE;
 
         if (iocb)
@@ -625,8 +611,7 @@ static int send_packet(struct kiocb *iocb, struct socket *sock,
         if (unlikely(dest))
                 return send_msg(iocb, sock, m, total_len);
 
-        if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
-            (m->msg_iovlen > (unsigned int)INT_MAX))
+        if (total_len > TIPC_MAX_USER_MSG_SIZE)
                 return -EMSGSIZE;
 
         if (iocb)
@@ -711,8 +696,7 @@ static int send_stream(struct kiocb *iocb, struct socket *sock,
                 goto exit;
         }
 
-        if ((total_len > (unsigned int)INT_MAX) ||
-            (m->msg_iovlen > (unsigned int)INT_MAX)) {
+        if (total_len > (unsigned int)INT_MAX) {
                 res = -EMSGSIZE;
                 goto exit;
         }
@@ -1155,34 +1139,6 @@ static void tipc_data_ready(struct sock *sk, int len)
 }
 
 /**
- * rx_queue_full - determine if receive queue can accept another message
- * @msg: message to be added to queue
- * @queue_size: current size of queue
- * @base: nominal maximum size of queue
- *
- * Returns 1 if queue is unable to accept message, 0 otherwise
- */
-static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
-{
-        u32 threshold;
-        u32 imp = msg_importance(msg);
-
-        if (imp == TIPC_LOW_IMPORTANCE)
-                threshold = base;
-        else if (imp == TIPC_MEDIUM_IMPORTANCE)
-                threshold = base * 2;
-        else if (imp == TIPC_HIGH_IMPORTANCE)
-                threshold = base * 100;
-        else
-                return 0;
-
-        if (msg_connected(msg))
-                threshold *= 4;
-
-        return queue_size >= threshold;
-}
-
-/**
  * filter_connect - Handle all incoming messages for a connection-based socket
  * @tsock: TIPC socket
  * @msg: message
@@ -1260,6 +1216,36 @@ static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
 }
 
 /**
+ * rcvbuf_limit - get proper overload limit of socket receive queue
+ * @sk: socket
+ * @buf: message
+ *
+ * For all connection oriented messages, irrespective of importance,
+ * the default overload value (i.e. 67MB) is set as limit.
+ *
+ * For all connectionless messages, by default new queue limits are
+ * as belows:
+ *
+ * TIPC_LOW_IMPORTANCE       (5MB)
+ * TIPC_MEDIUM_IMPORTANCE    (10MB)
+ * TIPC_HIGH_IMPORTANCE      (20MB)
+ * TIPC_CRITICAL_IMPORTANCE  (40MB)
+ *
+ * Returns overload limit according to corresponding message importance
+ */
+static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
+{
+        struct tipc_msg *msg = buf_msg(buf);
+        unsigned int limit;
+
+        if (msg_connected(msg))
+                limit = CONN_OVERLOAD_LIMIT;
+        else
+                limit = sk->sk_rcvbuf << (msg_importance(msg) + 5);
+        return limit;
+}
+
+/**
  * filter_rcv - validate incoming message
  * @sk: socket
  * @buf: message
@@ -1275,7 +1261,7 @@ static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
 {
         struct socket *sock = sk->sk_socket;
         struct tipc_msg *msg = buf_msg(buf);
-        u32 recv_q_len;
+        unsigned int limit = rcvbuf_limit(sk, buf);
         u32 res = TIPC_OK;
 
         /* Reject message if it is wrong sort of message for socket */
@@ -1292,15 +1278,13 @@ static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
         }
 
         /* Reject message if there isn't room to queue it */
-        recv_q_len = skb_queue_len(&sk->sk_receive_queue);
-        if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
-                if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
-                        return TIPC_ERR_OVERLOAD;
-        }
+        if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
+                return TIPC_ERR_OVERLOAD;
 
-        /* Enqueue message (finally!) */
+        /* Enqueue message */
         TIPC_SKB_CB(buf)->handle = 0;
         __skb_queue_tail(&sk->sk_receive_queue, buf);
+        skb_set_owner_r(buf, sk);
 
         sk->sk_data_ready(sk, 0);
         return TIPC_OK;
@@ -1349,7 +1333,7 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
         if (!sock_owned_by_user(sk)) {
                 res = filter_rcv(sk, buf);
         } else {
-                if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
+                if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
                         res = TIPC_ERR_OVERLOAD;
                 else
                         res = TIPC_OK;
@@ -1583,6 +1567,7 @@ static int accept(struct socket *sock, struct socket *new_sock, int flags)
         } else {
                 __skb_dequeue(&sk->sk_receive_queue);
                 __skb_queue_head(&new_sk->sk_receive_queue, buf);
+                skb_set_owner_r(buf, new_sk);
         }
         release_sock(new_sk);
 
@@ -1637,7 +1622,7 @@ restart:
         case SS_DISCONNECTING:
 
                 /* Discard any unreceived messages */
-                discard_rx_queue(sk);
+                __skb_queue_purge(&sk->sk_receive_queue);
 
                 /* Wake up anyone sleeping in poll */
                 sk->sk_state_change(sk);