Commit 36c01245 authored by Oliver Hartkopp's avatar Oliver Hartkopp Committed by Marc Kleine-Budde
Browse files

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 514ac99c

 "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: default avatarManfred Schlaegl <manfred.schlaegl@gmx.at>
Signed-off-by: default avatarOliver Hartkopp <socketcan@hartkopp.net>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 7b48f457
......@@ -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;
......
......@@ -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;
......
......@@ -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);
}
......
......@@ -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++;
......
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