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selftests: bpf: log direct file writes 

Recent changes to netdevsim moved creating and destroying
devices from netlink to sysfs. The sysfs writes have been
implemented as direct writes, without shelling out. This
is faster, but leaves no trace in the logs. Add explicit
logs to make debugging possible.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-11-05 13:26:12 -08:00 committed by David S. Miller
parent bfcccfe78b
commit acceca8d24
1 changed files with 14 additions and 6 deletions
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20
tools/testing/selftests/bpf/test_offload.py
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@ -335,13 +335,22 @@ class NetdevSimDev:
"""
Class for netdevsim bus device and its attributes.
"""
@staticmethod
def ctrl_write(path, val):
fullpath = os.path.join("/sys/bus/netdevsim/", path)
try:
with open(fullpath, "w") as f:
f.write(val)
except OSError as e:
log("WRITE %s: %r" % (fullpath, val), -e.errno)
raise e
log("WRITE %s: %r" % (fullpath, val), 0)
def __init__(self, port_count=1):
addr = 0
while True:
try:
with open("/sys/bus/netdevsim/new_device", "w") as f:
f.write("%u %u" % (addr, port_count))
self.ctrl_write("new_device", "%u %u" % (addr, port_count))
except OSError as e:
if e.errno == errno.ENOSPC:
addr += 1
@ -403,14 +412,13 @@ class NetdevSimDev:
return progs
def remove(self):
with open("/sys/bus/netdevsim/del_device", "w") as f:
f.write("%u" % self.addr)
self.ctrl_write("del_device", "%u" % (self.addr, ))
devs.remove(self)
def remove_nsim(self, nsim):
self.nsims.remove(nsim)
with open("/sys/bus/netdevsim/devices/netdevsim%u/del_port" % self.addr ,"w") as f:
f.write("%u" % nsim.port_index)
self.ctrl_write("devices/netdevsim%u/del_port" % (self.addr, ),
"%u" % (nsim.port_index, ))
class NetdevSim:
"""