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10c2aba89c
Implement channel management functions to allow dynamic addition and removal of transmit queues. The `ethtool --show-channels` and `ethtool --set-channels` commands can be used to get and set the number of queues, respectively. Allow the ability to add as many transmit queues as available processors but never allow more than the hard maximum of 16. The number of receive queues is one and cannot be modified. Depending on whether the requested number of queues is larger or smaller than the current value, either allocate or free long term buffers. Since long term buffer construction and destruction can occur in two different areas, from either channel set requests or device open/close, define functions for performing this work. If allocation of a new buffer fails, then attempt to revert back to the previous number of queues. Signed-off-by: Nick Child <nnac123@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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