igb: consolidate creation of Tx buffer info and data descriptor
This change will combine the writes of tx_buffer_info and the Tx data descriptors into a single function. The advantage of this is that we can avoid needless memory reads from the buffer info struct and speed things up by keeping the accesses to the local registers. Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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