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(cherry picked from commit 99b1d9ee28d11d43840f9e2c1c9e8bda1176d866)
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(cherry picked from commit bddeae3755c8d83f4c47bc3b3798858a95427530)
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In addition to commit cf1156a60e ("ethernet: T3163: probe driver for maximum
rx/tx ring-buffer size") this extends the logic in a way as not every driver
supports setting the buffers at all so it will properly error out.
When invoking "ethtool -g" both stdout and stderr are captured and no exception
is raised if it's an unsupported driver feature. The verify() section will
inform the user about the illegal operation.
(cherry picked from commit 159899ed9ba5661e4bdcfdadf1292e237f117063)
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