can: fix loss of CAN frames in raw_rcv

As reported by Manfred Schlaegl here

   http://marc.info/?l=linux-netdev&m=143482089824232&w=2

commit 514ac99c64b "can: fix multiple delivery of a single CAN frame for
overlapping CAN filters" requires the skb->tstamp to be set to check for
identical CAN skbs.

As net timestamping is influenced by several players (netstamp_needed and
netdev_tstamp_prequeue) Manfred missed a proper timestamp which leads to
CAN frame loss.

As skb timestamping became now mandatory for CAN related skbs this patch
makes sure that received CAN skbs always have a proper timestamp set.
Maybe there's a better solution in the future but this patch fixes the
CAN frame loss so far.

Reported-by: Manfred Schlaegl <manfred.schlaegl@gmx.at>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index b0f6924..e9b1810 100644 (file)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -440,6 +440,9 @@ unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
                struct can_frame *cf = (struct can_frame *)skb->data;
                u8 dlc = cf->can_dlc;
 
+               if (!(skb->tstamp.tv64))
+                       __net_timestamp(skb);
+
                netif_rx(priv->echo_skb[idx]);
                priv->echo_skb[idx] = NULL;
 
@@ -575,6 +578,7 @@ struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
        if (unlikely(!skb))
                return NULL;
 
+       __net_timestamp(skb);
        skb->protocol = htons(ETH_P_CAN);
        skb->pkt_type = PACKET_BROADCAST;
        skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -603,6 +607,7 @@ struct sk_buff *alloc_canfd_skb(struct net_device *dev,
        if (unlikely(!skb))
                return NULL;
 
+       __net_timestamp(skb);
        skb->protocol = htons(ETH_P_CANFD);
        skb->pkt_type = PACKET_BROADCAST;
        skb->ip_summed = CHECKSUM_UNNECESSARY;

diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c
index c837eb9..f64f529 100644 (file)
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -207,6 +207,7 @@ static void slc_bump(struct slcan *sl)
        if (!skb)
                return;
 
+       __net_timestamp(skb);
        skb->dev = sl->dev;
        skb->protocol = htons(ETH_P_CAN);
        skb->pkt_type = PACKET_BROADCAST;

diff --git a/drivers/net/can/vcan.c b/drivers/net/can/vcan.c
index 674f367..0ce868d 100644 (file)
--- a/drivers/net/can/vcan.c
+++ b/drivers/net/can/vcan.c
@@ -78,6 +78,9 @@ static void vcan_rx(struct sk_buff *skb, struct net_device *dev)
        skb->dev       = dev;
        skb->ip_summed = CHECKSUM_UNNECESSARY;
 
+       if (!(skb->tstamp.tv64))
+               __net_timestamp(skb);
+
        netif_rx_ni(skb);
 }
 

diff --git a/net/can/af_can.c b/net/can/af_can.c
index 32d710e..689c818 100644 (file)
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -310,8 +310,12 @@ int can_send(struct sk_buff *skb, int loop)
                return err;
        }
 
-       if (newskb)
+       if (newskb) {
+               if (!(newskb->tstamp.tv64))
+                       __net_timestamp(newskb);
+
                netif_rx_ni(newskb);
+       }
 
        /* update statistics */
        can_stats.tx_frames++;