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Ramon Fried 59ab136a9e net: cadence_gem: clear RX control descriptor 
The RX ring descriptors control field is used for setting
SOF and EOF (start of frame and end of frame).
The SOF and EOF weren't cleared from the previous descriptors,
causing inconsistencies in ring buffer.
Fix that by clearing the control field of every descriptors we're
processing.

Signed-off-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20200418085145.489726-1-rfried.dev@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
 2020-04-30 15:35:41 +01:00
Ramon Fried f1e7cb1388 Cadence: gem: fix wraparound in 64bit descriptors 
Wraparound of TX descriptor cyclic buffer only updated
the low 32 bits of the descriptor.
Fix that by checking if we're working with 64bit descriptors.

Signed-off-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 20200417171736.441607-1-rfried.dev@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
 2020-04-30 15:35:41 +01:00