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ucc_geth: Fix TX watchdog timeout handling 

The timeout handling code is currently broken in several ways:

- It calls stop() (which frees all the memory and IRQ), and then
  calls startup() (which won't re-request IRQ, neither it will
  re-init the Fast UCC structure).
- It calls these routines from the softirq context, which is wrong,
  since stop() calls free_irq() (which might sleep) and startup()
  allocates things with GFP_KERNEL.
- It won't soft-reset the PHY. We need the PHY reset for at least
  MPC8360E-MDS boards with Marvell 88E1111 PHY, the PHY won't recover
  from timeouts w/o the reset.

So the patch fixes these problems by implementing the workqueue for the
timeout handling, and there we fully re-open the device via close() and
open() calls. The close/open paths do the right things, and I can see
that the driver actually survive the timeouts.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Vorontsov 2008-12-18 08:23:26 +00:00 committed by David S. Miller
parent b3431c6476
commit 1762a29ae5
2 changed files with 30 additions and 8 deletions
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37
drivers/net/ucc_geth.c
View File

@ -3355,13 +3355,17 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
return 0;
}
/* ucc_geth_timeout gets called when a packet has not been
* transmitted after a set amount of time.
* For now, assume that clearing out all the structures, and
* starting over will fix the problem. */
static void ucc_geth_timeout(struct net_device *dev)
static int ucc_geth_close(struct net_device *dev);
static int ucc_geth_open(struct net_device *dev);
/* Reopen device. This will reset the MAC and PHY. */
static void ucc_geth_timeout_work(struct work_struct *work)
{
struct ucc_geth_private *ugeth = netdev_priv(dev);
struct ucc_geth_private *ugeth;
struct net_device *dev;
ugeth = container_of(work, struct ucc_geth_private, timeout_work);
dev = ugeth->dev;
ugeth_vdbg("%s: IN", __func__);
@ -3370,13 +3374,29 @@ static void ucc_geth_timeout(struct net_device *dev)
ugeth_dump_regs(ugeth);
if (dev->flags & IFF_UP) {
ucc_geth_stop(ugeth);
ucc_geth_startup(ugeth);
/*
* Must reset MAC *and* PHY. This is done by reopening
* the device.
*/
ucc_geth_close(dev);
ucc_geth_open(dev);
}
netif_tx_schedule_all(dev);
}
/*
* ucc_geth_timeout gets called when a packet has not been
* transmitted after a set amount of time.
*/
static void ucc_geth_timeout(struct net_device *dev)
{
struct ucc_geth_private *ugeth = netdev_priv(dev);
netif_carrier_off(dev);
schedule_work(&ugeth->timeout_work);
}
/* This is called by the kernel when a frame is ready for transmission. */
/* It is pointed to by the dev->hard_start_xmit function pointer */
static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
@ -4027,6 +4047,7 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
dev->hard_start_xmit = ucc_geth_start_xmit;
dev->tx_timeout = ucc_geth_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
INIT_WORK(&ugeth->timeout_work, ucc_geth_timeout_work);
netif_napi_add(dev, &ugeth->napi, ucc_geth_poll, UCC_GETH_DEV_WEIGHT);
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = ucc_netpoll;

1
drivers/net/ucc_geth.h
View File

@ -1186,6 +1186,7 @@ struct ucc_geth_private {
struct ucc_fast_private *uccf;
struct net_device *dev;
struct napi_struct napi;
struct work_struct timeout_work;
struct ucc_geth __iomem *ug_regs;
struct ucc_geth_init_pram *p_init_enet_param_shadow;
struct ucc_geth_exf_global_pram __iomem *p_exf_glbl_param;