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Introduce sdio tx aggregation to reduce bus transaction ands improve tx throughput. For the moment the skb are copied in a dedicated buffer since mmc APIs do not support sg table for zero-copy. Since skb data are already copied in xmit_buff[], avoid linearization in ma80211 layer. Relying on tx aggregation, we improve tx tpt of ~65%. Tested-by: Sean Wang <[email protected]> Co-developed-by: Sean Wang <[email protected]> Signed-off-by: Sean Wang <[email protected]> Signed-off-by: Lorenzo Bianconi <[email protected]> Signed-off-by: Felix Fietkau <[email protected]>