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lib/mqnic: Attempt to locate miscdev via PCIe device so that userspace tools still work when specifying the PCIe BDF when the driver is loaded

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich 2023-06-16 14:55:20 -07:00
parent 0f566cba49
commit fde1f5d341
1 changed files with 21 additions and 6 deletions
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27
lib/mqnic/mqnic.c
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@ -326,13 +326,16 @@ fail_open:
return -1;
}
static int mqnic_try_open_if_name(struct mqnic *dev, const char *if_name)
static int mqnic_try_open_miscdev(struct mqnic *dev, const char *fmt, ...)
{
va_list ap;
DIR *folder;
struct dirent *entry;
char path[PATH_MAX];
snprintf(path, sizeof(path), "/sys/class/net/%s/device/misc/", if_name);
va_start(ap, fmt);
vsnprintf(path, sizeof(path), fmt, ap);
va_end(ap);
folder = opendir(path);
if (!folder)
@ -372,16 +375,28 @@ struct mqnic *mqnic_open(const char *dev_name)
dev->app_fd = -1;
dev->ram_fd = -1;
// absolute path
// miscdev absolute path
if (mqnic_try_open(dev, "%s", dev_name) == 0)
goto open;
// device name
// miscdev device name
if (mqnic_try_open(dev, "/dev/%s", dev_name) == 0)
goto open;
// network interface
if (mqnic_try_open_if_name(dev, dev_name) == 0)
// miscdev via network interface name
if (mqnic_try_open_miscdev(dev, "/sys/class/net/%s/device/misc/", dev_name) == 0)
goto open;
// miscdev via PCIe sysfs path
if (mqnic_try_open_miscdev(dev, "%s/misc/", dev_name) == 0)
goto open;
// miscdev via PCIe BDF (dddd:xx:yy.z)
if (mqnic_try_open_miscdev(dev, "/sys/bus/pci/devices/%s/misc/", dev_name) == 0)
goto open;
// miscdev via PCIe BDF (xx:yy.z)
if (mqnic_try_open_miscdev(dev, "/sys/bus/pci/devices/0000:%s/misc/", dev_name) == 0)
goto open;
// PCIe sysfs path