From: Tim Sell <Timothy.Sell@xxxxxxxxxx>
Add error message to genuine rare error paths, and debug messages
to enable relatively non-verbose tracing of code paths
You can enable debug messages by including this on the kernel command line:
visornic.dyndbg=+p
or by this from the command line:
echo "module visornic +p" > <debugfs>/dynamic_debug/control
Refer to Documentation/dynamic-debug-howto.txt for more details.
In addition to the new debug and error messages, a message like the
following will be logged every time a visornic device is probed, which
will enable you to map back-and-forth between visorbus device names
(e.g., "vbus2:dev0") and netdev names (e.g., "eth0"):
visornic vbus2:dev0: visornic_probe success netdev=eth0
With this patch and visornic debugging enabled, you should expect to see
messages like the following in the most-common scenarios:
* driver loaded:
visornic_init
* device probed:
visornic vbus2:dev0: visornic_probe
visor_thread_start
visor_thread_start success
* network interface configured (ifconfig):
net eth0: visornic_open
net eth0: visornic_enable_with_timeout
net eth0: visornic_enable_with_timeout success
net eth0: visornic_open success
Signed-off-by: Tim Sell <Timothy.Sell@xxxxxxxxxx>
Signed-off-by: Benjamin Romer <benjamin.romer@xxxxxxxxxx>
---
drivers/staging/unisys/visornic/visornic_main.c | 91 ++++++++++++++++++++++---
1 file changed, 80 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c
index 915c913..de05ac7 100644
--- a/drivers/staging/unisys/visornic/visornic_main.c
+++ b/drivers/staging/unisys/visornic/visornic_main.c
@@ -299,6 +299,8 @@ static int visor_thread_start(struct visor_thread_info *thrinfo,
init_completion(&thrinfo->has_stopped);
thrinfo->task = kthread_run(threadfn, thrcontext, name);
if (IS_ERR(thrinfo->task)) {
+ pr_debug("%s failed (%ld)\n",
+ __func__, PTR_ERR(thrinfo->task));
thrinfo->id = 0;
return -EINVAL;
}
@@ -572,6 +574,8 @@ visornic_serverdown(struct visornic_devdata *devdata,
queue_work(visornic_serverdown_workqueue,
&devdata->serverdown_completion);
} else if (devdata->server_change_state) {
+ dev_dbg(&devdata->dev->device, "%s changing state\n",
+ __func__);
return -EINVAL;
}
return 0;
@@ -708,6 +712,8 @@ visornic_disable_with_timeout(struct net_device *netdev, const int timeout)
break;
if (devdata->server_down || devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
+ dev_dbg(&netdev->dev, "%s server went away\n",
+ __func__);
return -EIO;
}
set_current_state(TASK_INTERRUPTIBLE);
@@ -821,8 +827,11 @@ visornic_enable_with_timeout(struct net_device *netdev, const int timeout)
* gets a disable.
*/
i = init_rcv_bufs(netdev, devdata);
- if (i < 0)
+ if (i < 0) {
+ dev_err(&netdev->dev,
+ "%s failed to init rcv bufs (%d)\n", __func__, i);
return i;
+ }
spin_lock_irqsave(&devdata->priv_lock, flags);
devdata->enabled = 1;
@@ -845,6 +854,8 @@ visornic_enable_with_timeout(struct net_device *netdev, const int timeout)
break;
if (devdata->server_down || devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
+ dev_dbg(&netdev->dev, "%s server went away\n",
+ __func__);
return -EIO;
}
set_current_state(TASK_INTERRUPTIBLE);
@@ -855,8 +866,10 @@ visornic_enable_with_timeout(struct net_device *netdev, const int timeout)
spin_unlock_irqrestore(&devdata->priv_lock, flags);
- if (!devdata->enab_dis_acked)
+ if (!devdata->enab_dis_acked) {
+ dev_err(&netdev->dev, "%s missing ACK\n", __func__);
return -EIO;
+ }
/* find an open slot in the array to save off VisorNic references
* for debug
@@ -968,6 +981,8 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
devdata->server_change_state) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
+ dev_dbg(&netdev->dev,
+ "%s busy - queue stopped\n", __func__);
return NETDEV_TX_BUSY;
}
@@ -986,6 +1001,9 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
if (firstfraglen < ETH_HEADER_SIZE) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
+ dev_err(&netdev->dev,
+ "%s busy - first frag too small (%d)\n",
+ __func__, firstfraglen);
return NETDEV_TX_BUSY;
}
@@ -1025,6 +1043,9 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
netif_stop_queue(netdev);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
+ dev_dbg(&netdev->dev,
+ "%s busy - waiting for iovm to catch up\n",
+ __func__);
return NETDEV_TX_BUSY;
}
if (devdata->queuefullmsg_logged)
@@ -1065,6 +1086,8 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
if (cmdrsp->net.xmt.num_frags == -1) {
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
+ dev_err(&netdev->dev,
+ "%s busy - copy frags failed\n", __func__);
return NETDEV_TX_BUSY;
}
@@ -1073,6 +1096,8 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
netif_stop_queue(netdev);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
devdata->busy_cnt++;
+ dev_dbg(&netdev->dev,
+ "%s busy - signalinsert failed\n", __func__);
return NETDEV_TX_BUSY;
}
@@ -1105,6 +1130,9 @@ visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
* netif_wake_queue() after lower
* threshold
*/
+ dev_dbg(&netdev->dev,
+ "%s busy - invoking iovm flow control\n",
+ __func__);
devdata->flow_control_upper_hits++;
}
spin_unlock_irqrestore(&devdata->priv_lock, flags);
@@ -1211,6 +1239,8 @@ visornic_xmit_timeout(struct net_device *netdev)
/* Ensure that a ServerDown message hasn't been received */
if (!devdata->enabled ||
(devdata->server_down && !devdata->server_change_state)) {
+ dev_dbg(&netdev->dev, "%s no processing\n",
+ __func__);
spin_unlock_irqrestore(&devdata->priv_lock, flags);
return;
}
@@ -1808,8 +1838,11 @@ static int visornic_probe(struct visor_device *dev)
u64 features;
netdev = alloc_etherdev(sizeof(struct visornic_devdata));
- if (!netdev)
+ if (!netdev) {
+ dev_err(&dev->device,
+ "%s alloc_etherdev failed\n", __func__);
return -ENOMEM;
+ }
netdev->netdev_ops = &visornic_dev_ops;
netdev->watchdog_timeo = (5 * HZ);
@@ -1821,11 +1854,17 @@ static int visornic_probe(struct visor_device *dev)
vnic.macaddr);
err = visorbus_read_channel(dev, channel_offset, netdev->dev_addr,
ETH_ALEN);
- if (err < 0)
+ if (err < 0) {
+ dev_err(&dev->device,
+ "%s failed to get mac addr from chan (%d)\n",
+ __func__, err);
goto cleanup_netdev;
+ }
devdata = devdata_initialize(netdev_priv(netdev), dev);
if (!devdata) {
+ dev_err(&dev->device,
+ "%s devdata_initialize failed\n", __func__);
err = -ENOMEM;
goto cleanup_netdev;
}
@@ -1842,8 +1881,12 @@ static int visornic_probe(struct visor_device *dev)
vnic.num_rcv_bufs);
err = visorbus_read_channel(dev, channel_offset,
&devdata->num_rcv_bufs, 4);
- if (err)
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get #rcv bufs from chan (%d)\n",
+ __func__, err);
goto cleanup_netdev;
+ }
devdata->rcvbuf = kzalloc(sizeof(struct sk_buff *) *
devdata->num_rcv_bufs, GFP_KERNEL);
@@ -1884,38 +1927,58 @@ static int visornic_probe(struct visor_device *dev)
channel_offset = offsetof(struct spar_io_channel_protocol,
vnic.mtu);
err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4);
- if (err)
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get mtu from chan (%d)\n",
+ __func__, err);
goto cleanup_xmit_cmdrsp;
+ }
/* TODO: Setup Interrupt information */
/* Let's start our threads to get responses */
channel_offset = offsetof(struct spar_io_channel_protocol,
channel_header.features);
err = visorbus_read_channel(dev, channel_offset, &features, 8);
- if (err)
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to get features from chan (%d)\n",
+ __func__, err);
goto cleanup_xmit_cmdrsp;
+ }
features |= ULTRA_IO_CHANNEL_IS_POLLING;
err = visorbus_write_channel(dev, channel_offset, &features, 8);
- if (err)
+ if (err) {
+ dev_err(&dev->device,
+ "%s failed to set features in chan (%d)\n",
+ __func__, err);
goto cleanup_xmit_cmdrsp;
+ }
devdata->thread_wait_ms = 2;
visor_thread_start(&devdata->threadinfo, process_incoming_rsps,
devdata, "vnic_incoming");
err = register_netdev(netdev);
- if (err)
+ if (err) {
+ dev_err(&dev->device,
+ "%s register_netdev failed (%d)\n", __func__, err);
goto cleanup_thread_stop;
+ }
/* create debgug/sysfs directories */
devdata->eth_debugfs_dir = debugfs_create_dir(netdev->name,
visornic_debugfs_dir);
if (!devdata->eth_debugfs_dir) {
+ dev_err(&dev->device,
+ "%s debugfs_create_dir %s failed\n",
+ __func__, netdev->name);
err = -ENOMEM;
goto cleanup_thread_stop;
}
+ dev_info(&dev->device, "%s success netdev=%s\n",
+ __func__, netdev->name);
return 0;
cleanup_thread_stop:
@@ -1963,8 +2026,10 @@ static void visornic_remove(struct visor_device *dev)
{
struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
- if (!devdata)
+ if (!devdata) {
+ dev_err(&dev->device, "%s no devdata\n", __func__);
return;
+ }
dev_set_drvdata(&dev->device, NULL);
host_side_disappeared(devdata);
kref_put(&devdata->kref, devdata_release);
@@ -2010,8 +2075,10 @@ static int visornic_resume(struct visor_device *dev,
unsigned long flags;
devdata = dev_get_drvdata(&dev->device);
- if (!devdata)
+ if (!devdata) {
+ dev_err(&dev->device, "%s no devdata\n", __func__);
return -EINVAL;
+ }
netdev = devdata->netdev;
@@ -2039,6 +2106,8 @@ static int visornic_resume(struct visor_device *dev,
*/
send_enbdis(netdev, 1, devdata);
} else if (devdata->server_change_state) {
+ dev_err(&dev->device, "%s server_change_state\n",
+ __func__);
return -EIO;
}
--
2.1.4
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