Lines Matching defs:head
284 u16 head, tail;
780 int idx = dring->head;
809 /* move head ahead */
810 dring->head = (dring->head + 1) % DESC_NUM;
825 if (tx_ring->head >= tx_ring->tail)
826 filled = tx_ring->head - tx_ring->tail;
828 filled = tx_ring->head + DESC_NUM - tx_ring->tail;
1097 if (dring->head >= dring->tail)
1098 used = dring->head - dring->tail;
1100 used = dring->head + DESC_NUM - dring->tail;
1225 dring->head = 0;