gianfar: Cleanup TxFCB insertion on xmit
Cleanup gfar_start_xmit()'s fast path by factoring out "redundant" FCB insertion code (repeated gfar_add_fcb() calls and related) and by reducing the number of if() clauses (i.e. if(fcb) checks). Improve maintainability (e.g. there's less code and easier to read) also by introducing do_csum and do_vlan to mark the other 2 Tx TOE functionalities, following the same model as do_tstamp. fcb_len may also be 0 now, to mark that Tx FCB insertion conditions (do_csum, do_vlan, do_tstamp) have not been met. Signed-off-by: NClaudiu Manoil <claudiu.manoil@freescale.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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