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authorDhananjay Phadke <dhananjay@netxen.com>2009-09-05 17:43:08 +0000
committerDavid S. Miller <davem@davemloft.net>2009-09-07 01:53:06 -0700
commit6a581e93981e8838c85e407303186faf937830d3 (patch)
tree3e2f083971fc33d4a3e88e7cc37e346f775d7168 /Documentation/device-mapper
parentdb4cfd8a6149e778befb2ff6e6f91cdc6394cbe6 (diff)
netxen: firmware hang detection
Implement state machine to detect firmware hung state and recover. Since firmware will be shared by all PCI functions that have different class drivers (NIC or FCOE or iSCSI), explicit hardware based serialization is required for initializing firmware. o Used global scratchpad register to maintain device reference count. Every probed pci function adds to ref count. o Implement timer (delayed work) for each pci func that checks firmware heartbit every 5 sec and detaches itself if firmware is dead. Last detaching function reloads firmware. Other functions wait for firmware init, and re-attach themselves. Heartbit is not supported by NX2031 firmware. Signed-off-by: Amit Kumar Salecha <amit@netxen.com> Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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