Commit bb8813be authored by Oleksij Rempel's avatar Oleksij Rempel Committed by Greg Kroah-Hartman

can: rx-offload: introduce can_rx_offload_get_echo_skb() and...

can: rx-offload: introduce can_rx_offload_get_echo_skb() and can_rx_offload_queue_sorted() functions

commit 55059f2b upstream.

Current CAN framework can't guarantee proper/chronological order
of RX and TX-ECHO messages. To make this possible, drivers should use
this functions instead of can_get_echo_skb().
Signed-off-by: default avatarOleksij Rempel <o.rempel@pengutronix.de>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 906ed1bd
......@@ -209,6 +209,52 @@ int can_rx_offload_irq_offload_fifo(struct can_rx_offload *offload)
}
EXPORT_SYMBOL_GPL(can_rx_offload_irq_offload_fifo);
int can_rx_offload_queue_sorted(struct can_rx_offload *offload,
struct sk_buff *skb, u32 timestamp)
{
struct can_rx_offload_cb *cb;
unsigned long flags;
if (skb_queue_len(&offload->skb_queue) >
offload->skb_queue_len_max)
return -ENOMEM;
cb = can_rx_offload_get_cb(skb);
cb->timestamp = timestamp;
spin_lock_irqsave(&offload->skb_queue.lock, flags);
__skb_queue_add_sort(&offload->skb_queue, skb, can_rx_offload_compare);
spin_unlock_irqrestore(&offload->skb_queue.lock, flags);
can_rx_offload_schedule(offload);
return 0;
}
EXPORT_SYMBOL_GPL(can_rx_offload_queue_sorted);
unsigned int can_rx_offload_get_echo_skb(struct can_rx_offload *offload,
unsigned int idx, u32 timestamp)
{
struct net_device *dev = offload->dev;
struct net_device_stats *stats = &dev->stats;
struct sk_buff *skb;
u8 len;
int err;
skb = __can_get_echo_skb(dev, idx, &len);
if (!skb)
return 0;
err = can_rx_offload_queue_sorted(offload, skb, timestamp);
if (err) {
stats->rx_errors++;
stats->tx_fifo_errors++;
}
return len;
}
EXPORT_SYMBOL_GPL(can_rx_offload_get_echo_skb);
int can_rx_offload_irq_queue_err_skb(struct can_rx_offload *offload, struct sk_buff *skb)
{
if (skb_queue_len(&offload->skb_queue) >
......
......@@ -41,6 +41,10 @@ int can_rx_offload_add_timestamp(struct net_device *dev, struct can_rx_offload *
int can_rx_offload_add_fifo(struct net_device *dev, struct can_rx_offload *offload, unsigned int weight);
int can_rx_offload_irq_offload_timestamp(struct can_rx_offload *offload, u64 reg);
int can_rx_offload_irq_offload_fifo(struct can_rx_offload *offload);
int can_rx_offload_queue_sorted(struct can_rx_offload *offload,
struct sk_buff *skb, u32 timestamp);
unsigned int can_rx_offload_get_echo_skb(struct can_rx_offload *offload,
unsigned int idx, u32 timestamp);
int can_rx_offload_irq_queue_err_skb(struct can_rx_offload *offload, struct sk_buff *skb);
void can_rx_offload_reset(struct can_rx_offload *offload);
void can_rx_offload_del(struct can_rx_offload *offload);
......
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