[PATCH] ath10k: initialize msdu ext. descriptor before use
kvalo at qca.qualcomm.com
Thu Jul 30 07:05:47 PDT 2015
Peter Oh <poh at qca.qualcomm.com> writes:
> Initial QCA99X0 support has a known issue with TCP Tx throughput.
> All other path such as UDP Tx/Rx and TCP Rx meet their expectation
> (> 900Mbps), but TCP Tx marked as low as 5Mbps when single pair is
> used on iperf.
> The root cause is turned out because TSO flag is not initialized
> properly so that firmware configures TSO in wrong way.
> TSO flags in msdu extension descriptor is required to be reset
> to indicate firmware there is no TSO is enabled, otherwise it
> could act as TSO is enabled which causes huge throughput drop.
> In fact, it's enough by resetting TSO flags only to prevent the
> unexpected behavior, but initializing whole msdu ext. descriptor
> will help to clear uncertainty of firmware could bring on as it
> constantly updated.
> Signed-off-by: Peter Oh <poh at qca.qualcomm.com>
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