287 	igc_rx_ring_t *ring = buf->irb_ring;  in igc_rx_recycle()  local
321 	mutex_enter(&ring->irr_free_lock);  in igc_rx_recycle()
322 	ring->irr_free_list[ring->irr_nfree] = buf;  in igc_rx_recycle()
323 	ring->irr_nfree++;  in igc_rx_recycle()
325 	igc_t *igc = ring->irr_igc;  in igc_rx_recycle()
326 	ASSERT3U(ring->irr_nfree, <=, igc->igc_rx_nfree);  in igc_rx_recycle()
328 	cv_signal(&ring->irr_free_cv);  in igc_rx_recycle()
329 	mutex_exit(&ring->irr_free_lock);  in igc_rx_recycle()
333 igc_rx_bufs_free(igc_t *igc, igc_rx_ring_t *ring)  in igc_rx_bufs_free()  argument
336 		igc_rx_buffer_t *buf = &ring->irr_arena[i];  in igc_rx_bufs_free()
346 igc_rx_bufs_alloc(igc_t *igc, igc_rx_ring_t *ring)  in igc_rx_bufs_alloc()  argument
349 		igc_rx_buffer_t *buf = &ring->irr_arena[i];  in igc_rx_bufs_alloc()
354 		buf->irb_ring = ring;  in igc_rx_bufs_alloc()
359 			    "ring %u buffer %u", ring->irr_idx, i);  in igc_rx_bufs_alloc()
377 			ring->irr_work_list[i] = buf;  in igc_rx_bufs_alloc()
379 			ring->irr_free_list[ring->irr_nfree] = buf;  in igc_rx_bufs_alloc()
380 			ring->irr_nfree++;  in igc_rx_bufs_alloc()
391 		igc_rx_ring_t *ring = &igc->igc_rx_rings[i];  in igc_rx_data_free()  local
393 		if (ring->irr_arena != NULL) {  in igc_rx_data_free()
394 			igc_rx_bufs_free(igc, ring);  in igc_rx_data_free()
395 			kmem_free(ring->irr_arena, sizeof (igc_rx_buffer_t) *  in igc_rx_data_free()
397 			ring->irr_arena = NULL;  in igc_rx_data_free()
400 		if (ring->irr_free_list != NULL) {  in igc_rx_data_free()
401 			kmem_free(ring->irr_free_list, igc->igc_rx_nfree *  in igc_rx_data_free()
403 			ring->irr_free_list = NULL;  in igc_rx_data_free()
406 		if (ring->irr_work_list != NULL) {  in igc_rx_data_free()
407 			kmem_free(ring->irr_work_list, igc->igc_rx_ndesc *  in igc_rx_data_free()
409 			ring->irr_work_list = NULL;  in igc_rx_data_free()
412 		if (ring->irr_ring != NULL) {  in igc_rx_data_free()
413 			igc_dma_free(&ring->irr_desc_dma);  in igc_rx_data_free()
414 			ring->irr_ring = NULL;  in igc_rx_data_free()
415 			ring->irr_next = 0;  in igc_rx_data_free()
424 		igc_rx_ring_t *ring = &igc->igc_rx_rings[i];  in igc_rx_data_alloc()  local
431 		if (!igc_dma_alloc(igc, &ring->irr_desc_dma, &desc_attr,  in igc_rx_data_alloc()
437 		ring->irr_ring = (void *)ring->irr_desc_dma.idb_va;  in igc_rx_data_alloc()
439 		ring->irr_work_list = kmem_zalloc(sizeof (igc_rx_buffer_t *) *  in igc_rx_data_alloc()
441 		if (ring->irr_work_list == NULL) {  in igc_rx_data_alloc()
447 		ring->irr_free_list = kmem_zalloc(sizeof (igc_rx_buffer_t *) *  in igc_rx_data_alloc()
449 		if (ring->irr_free_list == NULL) {  in igc_rx_data_alloc()
456 		ring->irr_arena = kmem_zalloc(sizeof (igc_rx_buffer_t) *  in igc_rx_data_alloc()
458 		if (ring->irr_arena == NULL) {  in igc_rx_data_alloc()
464 		if (!igc_rx_bufs_alloc(igc, ring)) {  in igc_rx_data_alloc()
481 igc_rx_ring_desc_write(igc_rx_ring_t *ring, uint32_t idx)  in igc_rx_ring_desc_write()  argument
485 	igc_dma_buffer_t *irb = &ring->irr_work_list[idx]->irb_dma;  in igc_rx_ring_desc_write()
489 	ring->irr_ring[idx].read.pkt_addr = LE_64(addr);  in igc_rx_ring_desc_write()
490 	ring->irr_ring[idx].read.hdr_addr = LE_64(0);  in igc_rx_ring_desc_write()
502 igc_rx_ring_hw_init(igc_t *igc, igc_rx_ring_t *ring)  in igc_rx_ring_hw_init()  argument
508 		igc_rx_ring_desc_write(ring, i);  in igc_rx_ring_hw_init()
510 	IGC_DMA_SYNC(&ring->irr_desc_dma, DDI_DMA_SYNC_FORDEV);  in igc_rx_ring_hw_init()
515 	desc = ddi_dma_cookie_one(ring->irr_desc_dma.idb_hdl);  in igc_rx_ring_hw_init()
518 	igc_write32(igc, IGC_RDBAH(ring->irr_idx), high);  in igc_rx_ring_hw_init()
519 	igc_write32(igc, IGC_RDBAL(ring->irr_idx), low);  in igc_rx_ring_hw_init()
525 	igc_write32(igc, IGC_RDLEN(ring->irr_idx), val);  in igc_rx_ring_hw_init()
532 	igc_write32(igc, IGC_SRRCTL(ring->irr_idx), val);  in igc_rx_ring_hw_init()
538 	val = igc_read32(igc, IGC_RXDCTL(ring->irr_idx));  in igc_rx_ring_hw_init()
544 	igc_write32(igc, IGC_RXDCTL(ring->irr_idx), val);  in igc_rx_ring_hw_init()
648 igc_rx_copy(igc_rx_ring_t *ring, uint32_t idx, uint32_t len)  in igc_rx_copy()  argument
650 	const igc_rx_buffer_t *buf = ring->irr_work_list[idx];  in igc_rx_copy()
656 		ring->irr_stat.irs_copy_nomem.value.ui64++;  in igc_rx_copy()
663 	ring->irr_stat.irs_ncopy.value.ui64++;  in igc_rx_copy()
668 igc_rx_bind(igc_rx_ring_t *ring, uint32_t idx, uint32_t len)  in igc_rx_bind()  argument
670 	igc_rx_buffer_t *buf = ring->irr_work_list[idx];  in igc_rx_bind()
673 	ASSERT(MUTEX_HELD(&ring->irr_lock));  in igc_rx_bind()
679 	mutex_enter(&ring->irr_free_lock);  in igc_rx_bind()
680 	if (ring->irr_nfree == 0) {  in igc_rx_bind()
681 		ring->irr_stat.irs_bind_nobuf.value.ui64++;  in igc_rx_bind()
682 		mutex_exit(&ring->irr_free_lock);  in igc_rx_bind()
685 	ring->irr_nfree--;  in igc_rx_bind()
686 	sub = ring->irr_free_list[ring->irr_nfree];  in igc_rx_bind()
687 	mutex_exit(&ring->irr_free_lock);  in igc_rx_bind()
700 			ring->irr_stat.irs_bind_nomp.value.ui64++;  in igc_rx_bind()
701 			mutex_enter(&ring->irr_free_lock);  in igc_rx_bind()
702 			ring->irr_free_list[ring->irr_nfree] = sub;  in igc_rx_bind()
703 			ring->irr_nfree++;  in igc_rx_bind()
704 			mutex_exit(&ring->irr_free_lock);  in igc_rx_bind()
714 	ring->irr_work_list[idx] = sub;  in igc_rx_bind()
715 	ring->irr_stat.irs_nbind.value.ui64++;  in igc_rx_bind()
731 igc_rx_hcksum(igc_rx_ring_t *ring, mblk_t *mp, uint32_t status)  in igc_rx_hcksum()  argument
738 		ring->irr_stat.irs_ixsm.value.ui64++;  in igc_rx_hcksum()
743 		ring->irr_stat.irs_l4cksum_err.value.ui64++;  in igc_rx_hcksum()
749 		ring->irr_stat.irs_l3cksum_err.value.ui64++;  in igc_rx_hcksum()
755 		ring->irr_stat.irs_hcksum_hit.value.ui64++;  in igc_rx_hcksum()
758 		ring->irr_stat.irs_hcksum_miss.value.ui64++;  in igc_rx_hcksum()
763 igc_ring_rx(igc_rx_ring_t *ring, int poll_bytes)  in igc_ring_rx()  argument
768 	igc_t *igc = ring->irr_igc;  in igc_ring_rx()
771 	ASSERT(MUTEX_HELD(&ring->irr_lock));  in igc_ring_rx()
772 	IGC_DMA_SYNC(&ring->irr_desc_dma, DDI_DMA_SYNC_FORKERNEL);  in igc_ring_rx()
778 	cur_head = ring->irr_next;  in igc_ring_rx()
779 	cur_desc = &ring->irr_ring[cur_head];  in igc_ring_rx()
796 			ring->irr_stat.irs_desc_error.value.ui64++;  in igc_ring_rx()
811 			mp = igc_rx_bind(ring, cur_head, cur_length);  in igc_ring_rx()
815 			mp = igc_rx_copy(ring, cur_head, cur_length);  in igc_ring_rx()
819 			igc_rx_hcksum(ring, mp, cur_status);  in igc_ring_rx()
829 		igc_rx_ring_desc_write(ring, cur_head);  in igc_ring_rx()
835 		cur_desc = &ring->irr_ring[cur_head];  in igc_ring_rx()
861 		IGC_DMA_SYNC(&ring->irr_desc_dma, DDI_DMA_SYNC_FORDEV);  in igc_ring_rx()
862 		ring->irr_next = cur_head;  in igc_ring_rx()
864 		igc_write32(igc, IGC_RDT(ring->irr_idx), tail);  in igc_ring_rx()
866 		ring->irr_stat.irs_rbytes.value.ui64 += rx_bytes;  in igc_ring_rx()
867 		ring->irr_stat.irs_ipackets.value.ui64 += rx_frames;  in igc_ring_rx()
890 		igc_rx_ring_t *ring = &igc->igc_rx_rings[i];  in igc_rx_drain()  local
892 		mutex_enter(&ring->irr_free_lock);  in igc_rx_drain()
893 		while (ring->irr_nfree < igc->igc_rx_nfree) {  in igc_rx_drain()
894 			cv_wait(&ring->irr_free_cv, &ring->irr_free_lock);  in igc_rx_drain()
896 		mutex_exit(&ring->irr_free_lock);  in igc_rx_drain()
901 igc_tx_bufs_free(igc_t *igc, igc_tx_ring_t *ring)  in igc_tx_bufs_free()  argument
904 		igc_tx_buffer_t *buf = &ring->itr_arena[i];  in igc_tx_bufs_free()
926 igc_tx_bufs_alloc(igc_t *igc, igc_tx_ring_t *ring)  in igc_tx_bufs_alloc()  argument
929 		igc_tx_buffer_t *buf = &ring->itr_arena[i];  in igc_tx_bufs_alloc()
937 			    "ring %u buffer %u", ring->itr_idx, i);  in igc_tx_bufs_alloc()
946 			    "ring %u TX DMA handle %u: %d", ring->itr_idx, i,  in igc_tx_bufs_alloc()
951 		list_insert_tail(&ring->itr_free_list, buf);  in igc_tx_bufs_alloc()
961 		igc_tx_ring_t *ring = &igc->igc_tx_rings[i];  in igc_tx_data_free()  local
967 		while (list_remove_head(&ring->itr_free_list) != NULL)  in igc_tx_data_free()
970 		if (ring->itr_arena != NULL) {  in igc_tx_data_free()
971 			igc_tx_bufs_free(igc, ring);  in igc_tx_data_free()
972 			kmem_free(ring->itr_arena, sizeof (igc_tx_buffer_t) *  in igc_tx_data_free()
974 			ring->itr_arena = NULL;  in igc_tx_data_free()
977 		list_destroy(&ring->itr_free_list);  in igc_tx_data_free()
979 		if (ring->itr_work_list != NULL) {  in igc_tx_data_free()
980 			kmem_free(ring->itr_work_list, igc->igc_tx_ndesc *  in igc_tx_data_free()
982 			ring->itr_work_list = NULL;  in igc_tx_data_free()
985 		if (ring->itr_ring != NULL) {  in igc_tx_data_free()
986 			igc_dma_free(&ring->itr_desc_dma);  in igc_tx_data_free()
987 			ring->itr_ring = NULL;  in igc_tx_data_free()
988 			ring->itr_ring_head = 0;  in igc_tx_data_free()
989 			ring->itr_ring_tail = 0;  in igc_tx_data_free()
990 			ring->itr_ring_free = 0;  in igc_tx_data_free()
999 		igc_tx_ring_t *ring = &igc->igc_tx_rings[i];  in igc_tx_data_alloc()  local
1006 		if (!igc_dma_alloc(igc, &ring->itr_desc_dma, &desc_attr,  in igc_tx_data_alloc()
1012 		ring->itr_ring = (void *)ring->itr_desc_dma.idb_va;  in igc_tx_data_alloc()
1014 		ring->itr_work_list = kmem_zalloc(sizeof (igc_tx_buffer_t *) *  in igc_tx_data_alloc()
1016 		if (ring->itr_work_list == NULL) {  in igc_tx_data_alloc()
1022 		list_create(&ring->itr_free_list, sizeof (igc_tx_buffer_t),  in igc_tx_data_alloc()
1025 		ring->itr_arena = kmem_zalloc(sizeof (igc_tx_buffer_t) *  in igc_tx_data_alloc()
1027 		if (ring->itr_arena == NULL) {  in igc_tx_data_alloc()
1033 		if (!igc_tx_bufs_alloc(igc, ring)) {  in igc_tx_data_alloc()
1046 igc_tx_ring_hw_init(igc_t *igc, igc_tx_ring_t *ring)  in igc_tx_ring_hw_init()  argument
1054 	desc = ddi_dma_cookie_one(ring->itr_desc_dma.idb_hdl);  in igc_tx_ring_hw_init()
1057 	igc_write32(igc, IGC_TDBAH(ring->itr_idx), high);  in igc_tx_ring_hw_init()
1058 	igc_write32(igc, IGC_TDBAL(ring->itr_idx), low);  in igc_tx_ring_hw_init()
1064 	igc_write32(igc, IGC_TDLEN(ring->itr_idx), val);  in igc_tx_ring_hw_init()
1071 	igc_write32(igc, IGC_TDH(ring->itr_idx), 0);  in igc_tx_ring_hw_init()
1072 	igc_write32(igc, IGC_TDT(ring->itr_idx), 0);  in igc_tx_ring_hw_init()
1073 	ring->itr_ring_head = 0;  in igc_tx_ring_hw_init()
1074 	ring->itr_ring_tail = 0;  in igc_tx_ring_hw_init()
1075 	ring->itr_ring_free = igc->igc_tx_ndesc;  in igc_tx_ring_hw_init()
1142 igc_tx_recycle(igc_t *igc, igc_tx_ring_t *ring)  in igc_tx_recycle()  argument
1156 	mutex_enter(&ring->itr_lock);  in igc_tx_recycle()
1157 	if (ring->itr_recycle) {  in igc_tx_recycle()
1158 		mutex_exit(&ring->itr_lock);  in igc_tx_recycle()
1161 	ring->itr_recycle = true;  in igc_tx_recycle()
1162 	head = ring->itr_ring_head;  in igc_tx_recycle()
1163 	tail = ring->itr_ring_tail;  in igc_tx_recycle()
1164 	mutex_exit(&ring->itr_lock);  in igc_tx_recycle()
1169 	IGC_DMA_SYNC(&ring->itr_desc_dma, DDI_DMA_SYNC_FORKERNEL);  in igc_tx_recycle()
1182 		igc_tx_buffer_t *check_buf = ring->itr_work_list[head];  in igc_tx_recycle()
1188 		status = LE_32(ring->itr_ring[last_desc].wb.status);  in igc_tx_recycle()
1203 			bzero(&ring->itr_ring[desc],  in igc_tx_recycle()
1206 			buf = ring->itr_work_list[desc];  in igc_tx_recycle()
1209 			ring->itr_work_list[desc] = NULL;  in igc_tx_recycle()
1222 	mutex_enter(&ring->itr_lock);  in igc_tx_recycle()
1223 	ring->itr_ring_head = head;  in igc_tx_recycle()
1224 	ring->itr_ring_free += ndesc;  in igc_tx_recycle()
1225 	list_move_tail(&ring->itr_free_list, &to_free);  in igc_tx_recycle()
1226 	if (ring->itr_mac_blocked && ring->itr_ring_free >  in igc_tx_recycle()
1228 		ring->itr_mac_blocked = false;  in igc_tx_recycle()
1231 	ring->itr_recycle = false;  in igc_tx_recycle()
1232 	mutex_exit(&ring->itr_lock);  in igc_tx_recycle()
1235 		mac_tx_ring_update(igc->igc_mac_hdl, ring->itr_rh);  in igc_tx_recycle()
1243 igc_tx_buffer_alloc(igc_tx_ring_t *ring)  in igc_tx_buffer_alloc()  argument
1246 	mutex_enter(&ring->itr_lock);  in igc_tx_buffer_alloc()
1247 	buf = list_remove_head(&ring->itr_free_list);  in igc_tx_buffer_alloc()
1249 		ring->itr_stat.its_no_tx_bufs.value.ui64++;  in igc_tx_buffer_alloc()
1251 	mutex_exit(&ring->itr_lock);  in igc_tx_buffer_alloc()
1260 igc_tx_ring_bind(igc_tx_ring_t *ring, mblk_t *mp, igc_tx_state_t *tx)  in igc_tx_ring_bind()  argument
1267 	buf = igc_tx_buffer_alloc(ring);  in igc_tx_ring_bind()
1279 		ring->itr_stat.its_tx_bind_fail.value.ui64++;  in igc_tx_ring_bind()
1280 		mutex_enter(&ring->itr_lock);  in igc_tx_ring_bind()
1281 		list_insert_tail(&ring->itr_free_list, buf);  in igc_tx_ring_bind()
1282 		mutex_exit(&ring->itr_lock);  in igc_tx_ring_bind()
1297 	ring->itr_stat.its_tx_bind.value.ui64++;  in igc_tx_ring_bind()
1306 igc_tx_ring_copy(igc_tx_ring_t *ring, mblk_t *mp, igc_tx_state_t *tx)  in igc_tx_ring_copy()  argument
1328 			tx->itx_cur_buf = igc_tx_buffer_alloc(ring);  in igc_tx_ring_copy()
1355 	ring->itr_stat.its_tx_copy.value.ui64++;  in igc_tx_ring_copy()
1366 igc_tx_ring_context_changed(igc_tx_ring_t *ring, igc_tx_state_t *tx)  in igc_tx_ring_context_changed()  argument
1369 	igc_tx_context_data_t *data = &ring->itr_tx_ctx;  in igc_tx_ring_context_changed()
1419 igc_tx_ring_write_buf_descs(igc_t *igc, igc_tx_ring_t *ring,  in igc_tx_ring_write_buf_descs()  argument
1427 	ASSERT(MUTEX_HELD(&ring->itr_lock));  in igc_tx_ring_write_buf_descs()
1430 	for (uint_t i = 0; i < nc; i++, ring->itr_ring_tail =  in igc_tx_ring_write_buf_descs()
1431 	    igc_next_desc(ring->itr_ring_tail, 1, igc->igc_tx_ndesc)) {  in igc_tx_ring_write_buf_descs()
1443 		desc = &ring->itr_ring[ring->itr_ring_tail];  in igc_tx_ring_write_buf_descs()
1453 			ring->itr_work_list[ring->itr_ring_tail] = buf;  in igc_tx_ring_write_buf_descs()
1465 igc_tx_ring_write_descs(igc_t *igc, igc_tx_ring_t *ring, mblk_t *mp,  in igc_tx_ring_write_descs()  argument
1481 	mutex_enter(&ring->itr_lock);  in igc_tx_ring_write_descs()
1482 	if (tx->itx_ndescs + igc->igc_tx_gap > ring->itr_ring_free) {  in igc_tx_ring_write_descs()
1486 		mutex_exit(&ring->itr_lock);  in igc_tx_ring_write_descs()
1487 		igc_tx_recycle(igc, ring);  in igc_tx_ring_write_descs()
1488 		mutex_enter(&ring->itr_lock);  in igc_tx_ring_write_descs()
1489 		if (tx->itx_ndescs + igc->igc_tx_gap > ring->itr_ring_free) {  in igc_tx_ring_write_descs()
1490 			mutex_exit(&ring->itr_lock);  in igc_tx_ring_write_descs()
1501 	if (do_ctx && !igc_tx_ring_context_changed(ring, tx)) {  in igc_tx_ring_write_descs()
1506 	ring->itr_ring_free -= tx->itx_ndescs;  in igc_tx_ring_write_descs()
1507 	ctx_desc = ring->itr_ring_tail;  in igc_tx_ring_write_descs()
1546 		ctx = (void *)&ring->itr_ring[ctx_desc];  in igc_tx_ring_write_descs()
1551 		ring->itr_ring_tail = igc_next_desc(ring->itr_ring_tail, 1,  in igc_tx_ring_write_descs()
1554 		    ring, igc_tx_state_t *, tx,  in igc_tx_ring_write_descs()
1558 	first_desc = ring->itr_ring_tail;  in igc_tx_ring_write_descs()
1561 		igc_tx_ring_write_buf_descs(igc, ring, buf);  in igc_tx_ring_write_descs()
1570 	last_desc = igc_prev_desc(ring->itr_ring_tail, 1, igc->igc_tx_ndesc);  in igc_tx_ring_write_descs()
1572 	ring->itr_ring[last_desc].read.cmd_type_len |= LE_32(flags);  in igc_tx_ring_write_descs()
1606 	ring->itr_ring[first_desc].read.cmd_type_len |= LE_32(flags);  in igc_tx_ring_write_descs()
1607 	ring->itr_ring[first_desc].read.olinfo_status |= LE_32(status);  in igc_tx_ring_write_descs()
1608 	ring->itr_work_list[first_desc]->itb_mp = mp;  in igc_tx_ring_write_descs()
1609 	ring->itr_work_list[first_desc]->itb_first = true;  in igc_tx_ring_write_descs()
1610 	ring->itr_work_list[first_desc]->itb_last_desc = last_desc;  in igc_tx_ring_write_descs()
1618 		ring->itr_work_list[ctx_desc] = ring->itr_work_list[first_desc];  in igc_tx_ring_write_descs()
1619 		ring->itr_work_list[first_desc] = NULL;  in igc_tx_ring_write_descs()
1622 	ring->itr_stat.its_obytes.value.ui64 += tx->itx_meoi.meoi_len;  in igc_tx_ring_write_descs()
1623 	ring->itr_stat.its_opackets.value.ui64++;  in igc_tx_ring_write_descs()
1625 	IGC_DMA_SYNC(&ring->itr_desc_dma, DDI_DMA_SYNC_FORDEV);  in igc_tx_ring_write_descs()
1626 	igc_write32(igc, IGC_TDT(ring->itr_idx), ring->itr_ring_tail);  in igc_tx_ring_write_descs()
1627 	mutex_exit(&ring->itr_lock);  in igc_tx_ring_write_descs()
1663 	igc_tx_ring_t *ring = arg;  in igc_ring_tx()  local
1664 	igc_t *igc = ring->itr_igc;  in igc_ring_tx()
1683 		ring->itr_stat.its_bad_meo.value.ui64++;  in igc_ring_tx()
1692 	if (ring->itr_ring_free < igc->igc_tx_recycle_thresh) {  in igc_ring_tx()
1693 		igc_tx_recycle(igc, ring);  in igc_ring_tx()
1696 	mutex_enter(&ring->itr_lock);  in igc_ring_tx()
1697 	if (ring->itr_ring_free < igc->igc_tx_notify_thresh) {  in igc_ring_tx()
1698 		ring->itr_stat.its_ring_full.value.ui64++;  in igc_ring_tx()
1699 		ring->itr_mac_blocked = true;  in igc_ring_tx()
1700 		mutex_exit(&ring->itr_lock);  in igc_ring_tx()
1703 	mutex_exit(&ring->itr_lock);  in igc_ring_tx()
1727 		    igc_tx_ring_bind(ring, cur_mp, &tx)) {  in igc_ring_tx()
1731 		if (!igc_tx_ring_copy(ring, cur_mp, &tx))  in igc_ring_tx()
1735 	if (!igc_tx_ring_write_descs(igc, ring, mp, &tx)) {  in igc_ring_tx()
1751 	mutex_enter(&ring->itr_lock);  in igc_ring_tx()
1752 	list_move_tail(&ring->itr_free_list, &tx.itx_bufs);  in igc_ring_tx()
1753 	ring->itr_mac_blocked = true;  in igc_ring_tx()
1754 	mutex_exit(&ring->itr_lock);  in igc_ring_tx()