58 		 "in tx chain");
269  * spider_net_free_chain - free descriptor chain
271  * @chain: address of chain
276 		      struct spider_net_descr_chain *chain)  in spider_net_free_chain()  argument
280 	descr = chain->ring;  in spider_net_free_chain()
285 	} while (descr != chain->ring);  in spider_net_free_chain()
287 	dma_free_coherent(&card->pdev->dev, chain->num_desc * sizeof(struct spider_net_hw_descr),  in spider_net_free_chain()
288 			  chain->hwring, chain->dma_addr);  in spider_net_free_chain()
292  * spider_net_init_chain - alloc and link descriptor chain
294  * @chain: address of chain
303 		       struct spider_net_descr_chain *chain)  in spider_net_init_chain()  argument
311 	alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);  in spider_net_init_chain()
313 	chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,  in spider_net_init_chain()
314 					   &chain->dma_addr, GFP_KERNEL);  in spider_net_init_chain()
315 	if (!chain->hwring)  in spider_net_init_chain()
319 	descr = chain->ring;  in spider_net_init_chain()
320 	hwdescr = chain->hwring;  in spider_net_init_chain()
321 	buf = chain->dma_addr;  in spider_net_init_chain()
322 	for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {  in spider_net_init_chain()
334 	(descr-1)->next = chain->ring;  in spider_net_init_chain()
335 	chain->ring->prev = descr-1;  in spider_net_init_chain()
337 	spin_lock_init(&chain->lock);  in spider_net_init_chain()
338 	chain->head = chain->ring;  in spider_net_init_chain()
339 	chain->tail = chain->ring;  in spider_net_init_chain()
344  * spider_net_free_rx_chain_contents - frees descr contents in rx chain
435  * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
438  * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
445 	/* assume chain is aligned correctly */  in spider_net_enable_rxchtails()
483  * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
488 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_refill_rx_chain()  local
496 	if (!spin_trylock_irqsave(&chain->lock, flags))  in spider_net_refill_rx_chain()
499 	while (spider_net_get_descr_status(chain->head->hwdescr) ==  in spider_net_refill_rx_chain()
501 		if (spider_net_prepare_rx_descr(card, chain->head))  in spider_net_refill_rx_chain()
503 		chain->head = chain->head->next;  in spider_net_refill_rx_chain()
506 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_refill_rx_chain()
518 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_alloc_rx_skbs()  local
519 	struct spider_net_descr *start = chain->tail;  in spider_net_alloc_rx_skbs()
522 	/* Link up the hardware chain pointers */  in spider_net_alloc_rx_skbs()
528 	/* Put at least one buffer into the chain. if this fails,  in spider_net_alloc_rx_skbs()
532 	if (spider_net_prepare_rx_descr(card, chain->head))  in spider_net_alloc_rx_skbs()
535 		chain->head = chain->head->next;  in spider_net_alloc_rx_skbs()
651 	struct spider_net_descr_chain *chain = &card->tx_chain;  in spider_net_prepare_tx_descr()  local
667 	spin_lock_irqsave(&chain->lock, flags);  in spider_net_prepare_tx_descr()
669 	if (descr->next == chain->tail->prev) {  in spider_net_prepare_tx_descr()
670 		spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_prepare_tx_descr()
676 	chain->head = descr->next;  in spider_net_prepare_tx_descr()
686 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_prepare_tx_descr()
698 	/* Chain the bus address, so that the DMA engine finds this descr. */  in spider_net_prepare_tx_descr()
766 	struct spider_net_descr_chain *chain = &card->tx_chain;  in spider_net_release_tx_chain()  local
775 		spin_lock_irqsave(&chain->lock, flags);  in spider_net_release_tx_chain()
776 		if (chain->tail == chain->head) {  in spider_net_release_tx_chain()
777 			spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
780 		descr = chain->tail;  in spider_net_release_tx_chain()
792 				spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
814 				spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
819 		chain->tail = descr->next;  in spider_net_release_tx_chain()
824 		spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_release_tx_chain()
843  * Writes the current tx chain head as start address
844  * of the tx descriptor chain and enables the transmission
990 	struct spider_net_descr_chain *chain = &card->rx_chain;  in show_rx_chain()  local
991 	struct spider_net_descr *start= chain->tail;  in show_rx_chain()
1000 	int off = start - chain->ring;  in show_rx_chain()
1004 		chain->num_desc);  in show_rx_chain()
1005 	dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",  in show_rx_chain()
1015 		off = descr - chain->ring;  in show_rx_chain()
1018 		if (descr == chain->head)  in show_rx_chain()
1019 			dev_info(dev, "Chain head is at %d, head status=0x%x\n",  in show_rx_chain()
1031 			dev_info(dev, "chain is cut at %d\n", off);  in show_rx_chain()
1034 			int from = (chain->num_desc + off - cnt) % chain->num_desc;  in show_rx_chain()
1035 			int to = (chain->num_desc + off - 1) % chain->num_desc;  in show_rx_chain()
1057 		cnt = descr - chain->ring;  in show_rx_chain()
1084  * to "catch up" to where the hardware chain pointer is at.
1089 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_resync_head_ptr()  local
1094 	descr = chain->head;  in spider_net_resync_head_ptr()
1100 	spin_lock_irqsave(&chain->lock, flags);  in spider_net_resync_head_ptr()
1102 	descr = chain->head;  in spider_net_resync_head_ptr()
1104 	for (i=0; i<chain->num_desc; i++) {  in spider_net_resync_head_ptr()
1109 	chain->head = descr;  in spider_net_resync_head_ptr()
1111 	spin_unlock_irqrestore(&chain->lock, flags);  in spider_net_resync_head_ptr()
1116 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_resync_tail_ptr()  local
1121 	descr = chain->tail;  in spider_net_resync_tail_ptr()
1124 	for (i=0; i<chain->num_desc; i++) {  in spider_net_resync_tail_ptr()
1130 	chain->tail = descr;  in spider_net_resync_tail_ptr()
1132 	if ((i == chain->num_desc) || (i == 0))  in spider_net_resync_tail_ptr()
1152 	struct spider_net_descr_chain *chain = &card->rx_chain;  in spider_net_decode_one_descr()  local
1153 	struct spider_net_descr *descr = chain->tail;  in spider_net_decode_one_descr()
1166 	chain->tail = descr->next;  in spider_net_decode_one_descr()
1445 		/* chain end. If a descriptor should be sent, kick off  in spider_net_handle_error_irq()
1474 		/* Could happen when rx chain is full */  in spider_net_handle_error_irq()
1492 	/* chain end */  in spider_net_handle_error_irq()
1510 		/* Could happen when rx chain is full */  in spider_net_handle_error_irq()
1773 	/* set chain tail address for RX chains and  in spider_net_enable_card()