Merge branch 'cxgb4-Fix-ethtool-selftest-flits-calculation'

Ganji Aravind says:

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cxgb4: Fix ethtool selftest flits calculation

Patch 1 will fix work request size calculation for loopback selftest.

Patch 2 will fix race between loopback selftest and normal Tx handler.
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Signed-off-by: David S. Miller <davem@davemloft.net>