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The sunvnet netdev is connected to the controlling ldom's vswitch
for network bridging. However, for higher performance between ldoms,
there also is a channel between each client ldom. These connections are
represented in the sunvnet driver by a queue for each ldom. The driver
uses select_queue to tell the stack which queue to use by tracking the mac
addresses on the other end of each port. When a connected ldom shuts down,
the driver receives an LDC_EVENT_RESET and the port is removed from the
driver, thus a queue with no ldom on the other end will never be selected
for Tx.
The driver was trying to reinforce the "don't use this queue" notion with
netif_tx_stop_queue() and netif_tx_wake_queue(), which really should only
be used to signal a Tx queue is full (aka XOFF). This misuse of queue
state resulted in NETDEV WATCHDOG messages and lots of unnecessary calls
into the driver's tx_timeout handler. Simply removing these takes care
of the problem.
Orabug: 25190537
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
9c5a3a1f93