From 9a12349663061d25b49e6542d005fa7193a2cb44 Mon Sep 17 00:00:00 2001 From: Reuben Dowle Date: Tue, 1 Nov 2011 11:18:03 +1300 Subject: [PATCH] can: flexcan: Fix CAN_RAW_RECV_OWN_MSGS and CAN_RAW_LOOPBACK Currently the flexcan driver uses hardware local echo. This blindly echos all transmitted frames to all receiving sockets, regardless what CAN_RAW_RECV_OWN_MSGS and CAN_RAW_LOOPBACK are set to. This patch now submits transmitted frames to be echoed in the transmit complete interrupt, preserving the reference to the sending socket. This allows the can protocol to correctly handle the local echo. Further this patch moves tx_bytes statistic accounting into the tx_complete handler. Signed-off-by: Reuben Dowle [mkl: move tx_bytes accounting into tx_complete handler; cleanups] Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 7fd8089946fb..ab0136f49f49 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -269,7 +269,6 @@ static int flexcan_get_berr_counter(const struct net_device *dev, static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) { const struct flexcan_priv *priv = netdev_priv(dev); - struct net_device_stats *stats = &dev->stats; struct flexcan_regs __iomem *regs = priv->base; struct can_frame *cf = (struct can_frame *)skb->data; u32 can_id; @@ -299,14 +298,11 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]); } + can_put_echo_skb(skb, dev, 0); + flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id); flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl); - kfree_skb(skb); - - /* tx_packets is incremented in flexcan_irq */ - stats->tx_bytes += cf->can_dlc; - return NETDEV_TX_OK; } @@ -609,7 +605,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) /* transmission complete interrupt */ if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) { - /* tx_bytes is incremented in flexcan_start_xmit */ + stats->tx_bytes += can_get_echo_skb(dev, 0); stats->tx_packets++; flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1); netif_wake_queue(dev); @@ -697,12 +693,13 @@ static int flexcan_chip_start(struct net_device *dev) * only supervisor access * enable warning int * choose format C + * disable local echo * */ reg_mcr = flexcan_read(®s->mcr); reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT | FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN | - FLEXCAN_MCR_IDAM_C; + FLEXCAN_MCR_IDAM_C | FLEXCAN_MCR_SRX_DIS; dev_dbg(dev->dev.parent, "%s: writing mcr=0x%08x", __func__, reg_mcr); flexcan_write(reg_mcr, ®s->mcr); @@ -970,7 +967,7 @@ static int __devinit flexcan_probe(struct platform_device *pdev) goto failed_map; } - dev = alloc_candev(sizeof(struct flexcan_priv), 0); + dev = alloc_candev(sizeof(struct flexcan_priv), 1); if (!dev) { err = -ENOMEM; goto failed_alloc; @@ -978,7 +975,7 @@ static int __devinit flexcan_probe(struct platform_device *pdev) dev->netdev_ops = &flexcan_netdev_ops; dev->irq = irq; - dev->flags |= IFF_ECHO; /* we support local echo in hardware */ + dev->flags |= IFF_ECHO; priv = netdev_priv(dev); priv->can.clock.freq = clock_freq; -- 2.20.1