net: Generalize socket rx gap / receive queue overflow cmsg

Create a new socket level option to report number of queue overflows

Recently I augmented the AF_PACKET protocol to report the number of frames lost
on the socket receive queue between any two enqueued frames.  This value was
exported via a SOL_PACKET level cmsg.  AFter I completed that work it was
requested that this feature be generalized so that any datagram oriented socket
could make use of this option.  As such I've created this patch, It creates a
new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
overflowed between any two given frames.  It also augments the AF_PACKET
protocol to take advantage of this new feature (as it previously did not touch
sk->sk_drops, which this patch uses to record the overflow count).  Tested
successfully by me.

Notes:

1) Unlike my previous patch, this patch simply records the sk_drops value, which
is not a number of drops between packets, but rather a total number of drops.
Deltas must be computed in user space.

2) While this patch currently works with datagram oriented protocols, it will
also be accepted by non-datagram oriented protocols. I'm not sure if thats
agreeable to everyone, but my argument in favor of doing so is that, for those
protocols which aren't applicable to this option, sk_drops will always be zero,
and reporting no drops on a receive queue that isn't used for those
non-participating protocols seems reasonable to me.  This also saves us having
to code in a per-protocol opt in mechanism.

3) This applies cleanly to net-next assuming that commit
977750076d98c7ff6cbda51858bb5a5894a9d9ab (my af packet cmsg patch) is reverted

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

17 files changed, 48 insertions, 19 deletions

diff --git a/net/atm/common.c b/net/atm/common.c
index 950bd16d2383..d61e051e0a3f 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -496,7 +496,7 @@ int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
         error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
         if (error)
                 return error;
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
         pr_debug("RcvM %d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize);
         atm_return(vcc, skb->truesize);
         skb_free_datagram(sk, skb);
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 1f6e49c1cde8..399e59c9c6cb 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -257,7 +257,7 @@ int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
         skb_reset_transport_header(skb);
         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
         if (err == 0)
-                sock_recv_timestamp(msg, sk, skb);
+                sock_recv_ts_and_drops(msg, sk, skb);
 
         skb_free_datagram(sk, skb);
 
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index c70786503850..d3bfc1b0afb1 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -703,7 +703,7 @@ static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
                 copied += chunk;
                 size   -= chunk;
 
-                sock_recv_timestamp(msg, sk, skb);
+                sock_recv_ts_and_drops(msg, sk, skb);
 
                 if (!(flags & MSG_PEEK)) {
                         atomic_sub(chunk, &sk->sk_rmem_alloc);
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 597da4f8f888..2f47039c79dd 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -1534,7 +1534,7 @@ static int bcm_recvmsg(struct kiocb *iocb, struct socket *sock,
                 return err;
         }
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (msg->msg_name) {
                 msg->msg_namelen = sizeof(struct sockaddr_can);
diff --git a/net/can/raw.c b/net/can/raw.c
index b5e897922d32..962fc9f1d0c7 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -702,7 +702,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
                 return err;
         }
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (msg->msg_name) {
                 msg->msg_namelen = sizeof(struct sockaddr_can);
diff --git a/net/core/sock.c b/net/core/sock.c
index 7626b6aacd68..43ca2c995393 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -276,6 +276,8 @@ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 {
         int err = 0;
         int skb_len;
+        unsigned long flags;
+        struct sk_buff_head *list = &sk->sk_receive_queue;
 
         /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
            number of warnings when compiling with -W --ANK
@@ -305,7 +307,10 @@ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
          */
         skb_len = skb->len;
 
-        skb_queue_tail(&sk->sk_receive_queue, skb);
+        spin_lock_irqsave(&list->lock, flags);
+        skb->dropcount = atomic_read(&sk->sk_drops);
+        __skb_queue_tail(list, skb);
+        spin_unlock_irqrestore(&list->lock, flags);
 
         if (!sock_flag(sk, SOCK_DEAD))
                 sk->sk_data_ready(sk, skb_len);
@@ -702,6 +707,12 @@ set_rcvbuf:
 
                 /* We implement the SO_SNDLOWAT etc to
                    not be settable (1003.1g 5.3) */
+        case SO_RXQ_OVFL:
+                if (valbool)
+                        sock_set_flag(sk, SOCK_RXQ_OVFL);
+                else
+                        sock_reset_flag(sk, SOCK_RXQ_OVFL);
+                break;
         default:
                 ret = -ENOPROTOOPT;
                 break;
@@ -901,6 +912,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
                 v.val = sk->sk_mark;
                 break;
 
+        case SO_RXQ_OVFL:
+                v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
+                break;
+
         default:
                 return -ENOPROTOOPT;
         }
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index a413b1bf4465..25ad956a39d8 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -303,7 +303,7 @@ static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
         if (err)
                 goto done;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (flags & MSG_TRUNC)
                 copied = skb->len;
diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index 30e74eee07d6..769c8d138fc3 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -191,7 +191,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
         if (err)
                 goto done;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (flags & MSG_TRUNC)
                 copied = skb->len;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 757c9171e7c2..f18172b07611 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -682,7 +682,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
         if (err)
                 goto done;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         /* Copy the address. */
         if (sin) {
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 194bcdc6d9fc..71e5353b30c8 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -955,7 +955,7 @@ try_again:
                 UDP_INC_STATS_USER(sock_net(sk),
                                 UDP_MIB_INDATAGRAMS, is_udplite);
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         /* Copy the address. */
         if (sin) {
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 4f24570b0869..d8375bc7f2d5 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -497,7 +497,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
                         sin6->sin6_scope_id = IP6CB(skb)->iif;
         }
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (np->rxopt.all)
                 datagram_recv_ctl(sk, msg, skb);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ff778c172ef2..1f8e2afa4490 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -252,7 +252,7 @@ try_again:
                                         UDP_MIB_INDATAGRAMS, is_udplite);
         }
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         /* Copy the address. */
         if (msg->msg_name) {
diff --git a/net/key/af_key.c b/net/key/af_key.c
index c078ae6e975b..472f6594184a 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3606,7 +3606,7 @@ static int pfkey_recvmsg(struct kiocb *kiocb,
         if (err)
                 goto out_free;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         err = (flags & MSG_TRUNC) ? skb->len : copied;
 
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index f87ed4803c11..bf3a2954cd4d 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -627,15 +627,14 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
 
         spin_lock(&sk->sk_receive_queue.lock);
         po->stats.tp_packets++;
+        skb->dropcount = atomic_read(&sk->sk_drops);
         __skb_queue_tail(&sk->sk_receive_queue, skb);
         spin_unlock(&sk->sk_receive_queue.lock);
         sk->sk_data_ready(sk, skb->len);
         return 0;
 
 drop_n_acct:
-        spin_lock(&sk->sk_receive_queue.lock);
-        po->stats.tp_drops++;
-        spin_unlock(&sk->sk_receive_queue.lock);
+        po->stats.tp_drops = atomic_inc_return(&sk->sk_drops);
 
 drop_n_restore:
         if (skb_head != skb->data && skb_shared(skb)) {
@@ -1478,7 +1477,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
         if (err)
                 goto out_free;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
 
         if (msg->msg_name)
                 memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa,
diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c
index a39bf97f8830..60c2b94e6b54 100644
--- a/net/rxrpc/ar-recvmsg.c
+++ b/net/rxrpc/ar-recvmsg.c
@@ -146,7 +146,7 @@ int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock,
                                 memcpy(msg->msg_name,
                                        &call->conn->trans->peer->srx,
                                        sizeof(call->conn->trans->peer->srx));
-                        sock_recv_timestamp(msg, &rx->sk, skb);
+                        sock_recv_ts_and_drops(msg, &rx->sk, skb);
                 }
 
                 /* receive the message */
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c8d05758661d..0970e92c6acd 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1958,7 +1958,7 @@ SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
         if (err)
                 goto out_free;
 
-        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_ts_and_drops(msg, sk, skb);
         if (sctp_ulpevent_is_notification(event)) {
                 msg->msg_flags |= MSG_NOTIFICATION;
                 sp->pf->event_msgname(event, msg->msg_name, addr_len);
diff --git a/net/socket.c b/net/socket.c
index 954f3381cc8a..807935693846 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -668,6 +668,21 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
 
 EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
 
+inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
+{
+        if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount)
+                put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL,
+                        sizeof(__u32), &skb->dropcount);
+}
+
+void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
+        struct sk_buff *skb)
+{
+        sock_recv_timestamp(msg, sk, skb);
+        sock_recv_drops(msg, sk, skb);
+}
+EXPORT_SYMBOL_GPL(sock_recv_ts_and_drops);
+
 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock,
                                  struct msghdr *msg, size_t size, int flags)
 {