1. Definitions of LOW and PANIC levels of the Rx buffers have changed.

2. In wait_for_cmd_complete there is no longer a writeq but just a
read and wait for strobe bit to reset.

3. In s2io_isr, the isr_lock has been done away with also the NICs
interrupt are no longer disabled explicitly on entering the interrupt
handler and re-enabled again before leaving it.

4. Also clearing the semaphore "tasklet_status" when exiting
erroneously from s2io_isr after failing fill_rx_buffer call.

5. The set/reset Tx Csum function through ethtool was added to the
ethtool_ops structure.

6. Added a Rx side error code in the rx_osm_handler function.

7. No longer stopping and waking Tx queue when link state changes in
s2io_link function.

8. removed the isr_lock spinlock from the s2io_nic structure.

9. changed parameters which determine thresholds(LOW and PANIC)
to replenish Rx buffers.
   This has been found to result in better performance.
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@s2io.com>
Signed-off-by: Ravinandan Arakali <ravinandan.arakali@s2io.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>