netxen_nic_init.c

		case NETXEN_NIC_RESPONSE_DESC:
			netxen_handle_fw_message(desc_cnt, consumer, sds_ring);
		default:
			goto skip;
		}

		WARN_ON(desc_cnt > 1);

		index  = netxen_get_sts_refhandle(sts_data);
		length = netxen_get_sts_totallength(sts_data);
		cksum  = netxen_get_sts_status(sts_data);
		pkt_offset = netxen_get_sts_pkt_offset(sts_data);

		rxbuf = netxen_process_rcv(adapter, ring, index,
				length, cksum, pkt_offset, sds_ring);

		if (rxbuf)
			list_add_tail(&rxbuf->list, &sds_ring->free_list[ring]);

skip:
		for (; desc_cnt > 0; desc_cnt--) {
			desc = &sds_ring->desc_head[consumer];
			desc->status_desc_data[0] =
				cpu_to_le64(STATUS_OWNER_PHANTOM);
			consumer = get_next_index(consumer, sds_ring->num_desc);
		}
		count++;
	}

	for (ring = 0; ring < adapter->max_rds_rings; ring++) {
		struct nx_host_rds_ring *rds_ring =
			&adapter->recv_ctx.rds_rings[ring];

		if (!list_empty(&sds_ring->free_list[ring])) {
			list_for_each(cur, &sds_ring->free_list[ring]) {
				rxbuf = list_entry(cur,
						struct netxen_rx_buffer, list);
				netxen_alloc_rx_skb(adapter, rds_ring, rxbuf);
			}
			spin_lock(&rds_ring->lock);
			netxen_merge_rx_buffers(&sds_ring->free_list[ring],
						&rds_ring->free_list);
			spin_unlock(&rds_ring->lock);
		}

		netxen_post_rx_buffers_nodb(adapter, rds_ring);
	}

	if (count) {
		sds_ring->consumer = consumer;
		NXWR32(adapter, sds_ring->crb_sts_consumer, consumer);
	}

	return count;
}

/* Process Command status ring */
int netxen_process_cmd_ring(struct netxen_adapter *adapter)
{
	u32 sw_consumer, hw_consumer;
	int count = 0, i;
	struct netxen_cmd_buffer *buffer;
	struct pci_dev *pdev = adapter->pdev;
	struct net_device *netdev = adapter->netdev;
	struct netxen_skb_frag *frag;
	int done = 0;
	struct nx_host_tx_ring *tx_ring = &adapter->tx_ring;

	if (!spin_trylock(&adapter->tx_clean_lock))
		return 1;

	sw_consumer = tx_ring->sw_consumer;
	barrier(); /* hw_consumer can change underneath */
	hw_consumer = le32_to_cpu(*(tx_ring->hw_consumer));

	while (sw_consumer != hw_consumer) {
		buffer = &tx_ring->cmd_buf_arr[sw_consumer];
		if (buffer->skb) {
			frag = &buffer->frag_array[0];
			pci_unmap_single(pdev, frag->dma, frag->length,
					 PCI_DMA_TODEVICE);
			frag->dma = 0ULL;
			for (i = 1; i < buffer->frag_count; i++) {
				frag++;	/* Get the next frag */
				pci_unmap_page(pdev, frag->dma, frag->length,
					       PCI_DMA_TODEVICE);
				frag->dma = 0ULL;
			}

			adapter->stats.xmitfinished++;
			dev_kfree_skb_any(buffer->skb);
			buffer->skb = NULL;
		}

		sw_consumer = get_next_index(sw_consumer, tx_ring->num_desc);
		if (++count >= MAX_STATUS_HANDLE)
			break;
	}

	if (count) {
		tx_ring->sw_consumer = sw_consumer;
		smp_mb();
		if (netif_queue_stopped(netdev) && netif_running(netdev)) {
			netif_tx_lock(netdev);
			netif_wake_queue(netdev);
			smp_mb();
			netif_tx_unlock(netdev);
		}
	}
	/*
	 * If everything is freed up to consumer then check if the ring is full
	 * If the ring is full then check if more needs to be freed and
	 * schedule the call back again.
	 *
	 * This happens when there are 2 CPUs. One could be freeing and the
	 * other filling it. If the ring is full when we get out of here and
	 * the card has already interrupted the host then the host can miss the
	 * interrupt.
	 *
	 * There is still a possible race condition and the host could miss an
	 * interrupt. The card has to take care of this.
	 */
	barrier(); /* hw_consumer can change underneath */
	hw_consumer = le32_to_cpu(*(tx_ring->hw_consumer));
	done = (sw_consumer == hw_consumer);
	spin_unlock(&adapter->tx_clean_lock);

	return (done);
}

void
netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ringid,
	struct nx_host_rds_ring *rds_ring)
{
	struct rcv_desc *pdesc;
	struct netxen_rx_buffer *buffer;
	int producer, count = 0;
	netxen_ctx_msg msg = 0;
	struct list_head *head;

	producer = rds_ring->producer;

	spin_lock(&rds_ring->lock);
	head = &rds_ring->free_list;
	while (!list_empty(head)) {

		buffer = list_entry(head->next, struct netxen_rx_buffer, list);

		if (!buffer->skb) {
			if (netxen_alloc_rx_skb(adapter, rds_ring, buffer))
				break;
		}

		count++;
		list_del(&buffer->list);

		/* make a rcv descriptor  */
		pdesc = &rds_ring->desc_head[producer];
		pdesc->addr_buffer = cpu_to_le64(buffer->dma);
		pdesc->reference_handle = cpu_to_le16(buffer->ref_handle);
		pdesc->buffer_length = cpu_to_le32(rds_ring->dma_size);

		producer = get_next_index(producer, rds_ring->num_desc);
	}
	spin_unlock(&rds_ring->lock);

	if (count) {
		rds_ring->producer = producer;
		NXWR32(adapter, rds_ring->crb_rcv_producer,
				(producer-1) & (rds_ring->num_desc-1));

		if (adapter->fw_major < 4) {
			/*
			 * Write a doorbell msg to tell phanmon of change in
			 * receive ring producer
			 * Only for firmware version < 4.0.0
			 */
			netxen_set_msg_peg_id(msg, NETXEN_RCV_PEG_DB_ID);
			netxen_set_msg_privid(msg);
			netxen_set_msg_count(msg,
					     ((producer - 1) &
					      (rds_ring->num_desc - 1)));
			netxen_set_msg_ctxid(msg, adapter->portnum);
			netxen_set_msg_opcode(msg, NETXEN_RCV_PRODUCER(ringid));
			writel(msg,
			       DB_NORMALIZE(adapter,
					    NETXEN_RCV_PRODUCER_OFFSET));
		}
	}
}

static void
netxen_post_rx_buffers_nodb(struct netxen_adapter *adapter,
		struct nx_host_rds_ring *rds_ring)
{
	struct rcv_desc *pdesc;
	struct netxen_rx_buffer *buffer;
	int producer, count = 0;
	struct list_head *head;

	producer = rds_ring->producer;
	if (!spin_trylock(&rds_ring->lock))
		return;

	head = &rds_ring->free_list;
	while (!list_empty(head)) {

		buffer = list_entry(head->next, struct netxen_rx_buffer, list);

		if (!buffer->skb) {
			if (netxen_alloc_rx_skb(adapter, rds_ring, buffer))
				break;
		}

		count++;
		list_del(&buffer->list);

		/* make a rcv descriptor  */
		pdesc = &rds_ring->desc_head[producer];
		pdesc->reference_handle = cpu_to_le16(buffer->ref_handle);
		pdesc->buffer_length = cpu_to_le32(rds_ring->dma_size);
		pdesc->addr_buffer = cpu_to_le64(buffer->dma);

		producer = get_next_index(producer, rds_ring->num_desc);
	}

	if (count) {
		rds_ring->producer = producer;
		NXWR32(adapter, rds_ring->crb_rcv_producer,
				(producer - 1) & (rds_ring->num_desc - 1));
			wmb();
	}
	spin_unlock(&rds_ring->lock);
}

void netxen_nic_clear_stats(struct netxen_adapter *adapter)
{
	memset(&adapter->stats, 0, sizeof(adapter->stats));
	return;
}