57ebabb3c6
In a multi segment frame, if the first tx descriptor is marked with TX_DESC_CTL but not all tx descriptors for the other segments in the frame are set up, the TX DMA may transmit an incomplete frame. To prevent this, set TX_DESC_CTL for the first tx descriptor only when done with all the other segments. Also, don't bother cleaning transmitted tx descriptors since TX_DESC_CTL is cleared for them by the hardware and they will be reprogrammed before TX_DESC_CTL is reenabled for them. Submitted by: Guy Yur <guyyur@gmail.com> Differential Revision: https://reviews.freebsd.org/D13030
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