From: Tim Sell Date: Thu, 9 Jul 2015 17:27:46 +0000 (-0400) Subject: staging: unisys: add error messages to visornic X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=00748b0c69becb3fc4e520a3f9047b46d3bffe2c;p=linux-beck.git staging: unisys: add error messages to visornic 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" > /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 Signed-off-by: Benjamin Romer Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c index 915c9132a5c4..de05ac79662a 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; }