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sfc: add sysfs entry to control MCDI tracing

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MCDI tracing is enabled per-function with a sysfs file
    /sys/class/net/<NET_DEV>/device/mcdi_logging

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2015-05-27 13:14:01 +01:00 committed by David S. Miller
parent 75aba2a52d
commit e7fef9b45a
4 changed files with 48 additions and 10 deletions
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3
drivers/net/ethernet/sfc/Kconfig
View File

@ -43,4 +43,5 @@ config SFC_MCDI_LOGGING
---help---
This enables support for tracing of MCDI (Management-Controller-to-
Driver-Interface) commands and responses, allowing debugging of
driver/firmware interaction.
driver/firmware interaction. The tracing is actually enabled by
a sysfs file 'mcdi_logging' under the PCI device.

45
drivers/net/ethernet/sfc/efx.c
View File

@ -2326,6 +2326,28 @@ show_phy_type(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR(phy_type, 0444, show_phy_type, NULL);
#ifdef CONFIG_SFC_MCDI_LOGGING
static ssize_t show_mcdi_log(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
return scnprintf(buf, PAGE_SIZE, "%d\n", mcdi->logging_enabled);
}
static ssize_t set_mcdi_log(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
bool enable = count > 0 && *buf != '0';
mcdi->logging_enabled = enable;
return count;
}
static DEVICE_ATTR(mcdi_logging, 0644, show_mcdi_log, set_mcdi_log);
#endif
static int efx_register_netdev(struct efx_nic *efx)
{
struct net_device *net_dev = efx->net_dev;
@ -2383,9 +2405,21 @@ static int efx_register_netdev(struct efx_nic *efx)
"failed to init net dev attributes\n");
goto fail_registered;
}
#ifdef CONFIG_SFC_MCDI_LOGGING
rc = device_create_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
if (rc) {
netif_err(efx, drv, efx->net_dev,
"failed to init net dev attributes\n");
goto fail_attr_mcdi_logging;
}
#endif
return 0;
#ifdef CONFIG_SFC_MCDI_LOGGING
fail_attr_mcdi_logging:
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
#endif
fail_registered:
rtnl_lock();
efx_dissociate(efx);
@ -2404,13 +2438,14 @@ static void efx_unregister_netdev(struct efx_nic *efx)
BUG_ON(netdev_priv(efx->net_dev) != efx);
if (efx_dev_registered(efx)) {
strlcpy(efx->name, pci_name(efx->pci_dev), sizeof(efx->name));
#ifdef CONFIG_SFC_MCDI_LOGGING
device_remove_file(&efx->pci_dev->dev, &dev_attr_mcdi_logging);
#endif
device_remove_file(&efx->pci_dev->dev, &dev_attr_phy_type);
rtnl_lock();
unregister_netdevice(efx->net_dev);
efx->state = STATE_UNINIT;
rtnl_unlock();
unregister_netdev(efx->net_dev);
}
}
/**************************************************************************

4
drivers/net/ethernet/sfc/mcdi.c
View File

@ -188,7 +188,7 @@ static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
}
#ifdef CONFIG_SFC_MCDI_LOGGING
if (!WARN_ON_ONCE(!buf)) {
if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
int bytes = 0;
int i;
/* Lengths should always be a whole number of dwords, so scream
@ -274,7 +274,7 @@ static void efx_mcdi_read_response_header(struct efx_nic *efx)
}
#ifdef CONFIG_SFC_MCDI_LOGGING
if (!WARN_ON_ONCE(!buf)) {
if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
size_t hdr_len, data_len;
int bytes = 0;
int i;

2
drivers/net/ethernet/sfc/mcdi.h
View File

@ -59,6 +59,7 @@ enum efx_mcdi_mode {
* @async_list: Queue of asynchronous requests
* @async_timer: Timer for asynchronous request timeout
* @logging_buffer: buffer that may be used to build MCDI tracing messages
* @logging_enabled: whether to trace MCDI
*/
struct efx_mcdi_iface {
struct efx_nic *efx;
@ -77,6 +78,7 @@ struct efx_mcdi_iface {
struct timer_list async_timer;
#ifdef CONFIG_SFC_MCDI_LOGGING
char *logging_buffer;
bool logging_enabled;
#endif
};