Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 797 insertions, 0 deletions

diff --git a/src/spdk/dpdk/kernel/linux/kni/kni_net.c b/src/spdk/dpdk/kernel/linux/kni/kni_net.c
new file mode 100644
index 00000000..7fcfa106
--- /dev/null
+++ b/src/spdk/dpdk/kernel/linux/kni/kni_net.c
@@ -0,0 +1,797 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) 2010-2014 Intel Corporation.
+ */
+
+/*
+ * This code is inspired from the book "Linux Device Drivers" by
+ * Alessandro Rubini and Jonathan Corbet, published by O'Reilly & Associates
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h> /* eth_type_trans */
+#include <linux/skbuff.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+
+#include <exec-env/rte_kni_common.h>
+#include <kni_fifo.h>
+
+#include "compat.h"
+#include "kni_dev.h"
+
+#define WD_TIMEOUT 5 /*jiffies */
+
+#define KNI_WAIT_RESPONSE_TIMEOUT 300 /* 3 seconds */
+
+/* typedef for rx function */
+typedef void (*kni_net_rx_t)(struct kni_dev *kni);
+
+static void kni_net_rx_normal(struct kni_dev *kni);
+
+/* kni rx function pointer, with default to normal rx */
+static kni_net_rx_t kni_net_rx_func = kni_net_rx_normal;
+
+/* physical address to kernel virtual address */
+static void *
+pa2kva(void *pa)
+{
+	return phys_to_virt((unsigned long)pa);
+}
+
+/* physical address to virtual address */
+static void *
+pa2va(void *pa, struct rte_kni_mbuf *m)
+{
+	void *va;
+
+	va = (void *)((unsigned long)pa +
+			(unsigned long)m->buf_addr -
+			(unsigned long)m->buf_physaddr);
+	return va;
+}
+
+/* mbuf data kernel virtual address from mbuf kernel virtual address */
+static void *
+kva2data_kva(struct rte_kni_mbuf *m)
+{
+	return phys_to_virt(m->buf_physaddr + m->data_off);
+}
+
+/* virtual address to physical address */
+static void *
+va2pa(void *va, struct rte_kni_mbuf *m)
+{
+	void *pa;
+
+	pa = (void *)((unsigned long)va -
+			((unsigned long)m->buf_addr -
+			 (unsigned long)m->buf_physaddr));
+	return pa;
+}
+
+/*
+ * It can be called to process the request.
+ */
+static int
+kni_net_process_request(struct kni_dev *kni, struct rte_kni_request *req)
+{
+	int ret = -1;
+	void *resp_va;
+	uint32_t num;
+	int ret_val;
+
+	if (!kni || !req) {
+		pr_err("No kni instance or request\n");
+		return -EINVAL;
+	}
+
+	mutex_lock(&kni->sync_lock);
+
+	/* Construct data */
+	memcpy(kni->sync_kva, req, sizeof(struct rte_kni_request));
+	num = kni_fifo_put(kni->req_q, &kni->sync_va, 1);
+	if (num < 1) {
+		pr_err("Cannot send to req_q\n");
+		ret = -EBUSY;
+		goto fail;
+	}
+
+	ret_val = wait_event_interruptible_timeout(kni->wq,
+			kni_fifo_count(kni->resp_q), 3 * HZ);
+	if (signal_pending(current) || ret_val <= 0) {
+		ret = -ETIME;
+		goto fail;
+	}
+	num = kni_fifo_get(kni->resp_q, (void **)&resp_va, 1);
+	if (num != 1 || resp_va != kni->sync_va) {
+		/* This should never happen */
+		pr_err("No data in resp_q\n");
+		ret = -ENODATA;
+		goto fail;
+	}
+
+	memcpy(req, kni->sync_kva, sizeof(struct rte_kni_request));
+	ret = 0;
+
+fail:
+	mutex_unlock(&kni->sync_lock);
+	return ret;
+}
+
+/*
+ * Open and close
+ */
+static int
+kni_net_open(struct net_device *dev)
+{
+	int ret;
+	struct rte_kni_request req;
+	struct kni_dev *kni = netdev_priv(dev);
+
+	netif_start_queue(dev);
+
+	memset(&req, 0, sizeof(req));
+	req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
+
+	/* Setting if_up to non-zero means up */
+	req.if_up = 1;
+	ret = kni_net_process_request(kni, &req);
+
+	return (ret == 0) ? req.result : ret;
+}
+
+static int
+kni_net_release(struct net_device *dev)
+{
+	int ret;
+	struct rte_kni_request req;
+	struct kni_dev *kni = netdev_priv(dev);
+
+	netif_stop_queue(dev); /* can't transmit any more */
+
+	memset(&req, 0, sizeof(req));
+	req.req_id = RTE_KNI_REQ_CFG_NETWORK_IF;
+
+	/* Setting if_up to 0 means down */
+	req.if_up = 0;
+	ret = kni_net_process_request(kni, &req);
+
+	return (ret == 0) ? req.result : ret;
+}
+
+static void
+kni_fifo_trans_pa2va(struct kni_dev *kni,
+	struct rte_kni_fifo *src_pa, struct rte_kni_fifo *dst_va)
+{
+	uint32_t ret, i, num_dst, num_rx;
+	void *kva;
+	do {
+		num_dst = kni_fifo_free_count(dst_va);
+		if (num_dst == 0)
+			return;
+
+		num_rx = min_t(uint32_t, num_dst, MBUF_BURST_SZ);
+
+		num_rx = kni_fifo_get(src_pa, kni->pa, num_rx);
+		if (num_rx == 0)
+			return;
+
+		for (i = 0; i < num_rx; i++) {
+			kva = pa2kva(kni->pa[i]);
+			kni->va[i] = pa2va(kni->pa[i], kva);
+		}
+
+		ret = kni_fifo_put(dst_va, kni->va, num_rx);
+		if (ret != num_rx) {
+			/* Failing should not happen */
+			pr_err("Fail to enqueue entries into dst_va\n");
+			return;
+		}
+	} while (1);
+}
+
+/* Try to release mbufs when kni release */
+void kni_net_release_fifo_phy(struct kni_dev *kni)
+{
+	/* release rx_q first, because it can't release in userspace */
+	kni_fifo_trans_pa2va(kni, kni->rx_q, kni->free_q);
+	/* release alloc_q for speeding up kni release in userspace */
+	kni_fifo_trans_pa2va(kni, kni->alloc_q, kni->free_q);
+}
+
+/*
+ * Configuration changes (passed on by ifconfig)
+ */
+static int
+kni_net_config(struct net_device *dev, struct ifmap *map)
+{
+	if (dev->flags & IFF_UP) /* can't act on a running interface */
+		return -EBUSY;
+
+	/* ignore other fields */
+	return 0;
+}
+
+/*
+ * Transmit a packet (called by the kernel)
+ */
+static int
+kni_net_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	int len = 0;
+	uint32_t ret;
+	struct kni_dev *kni = netdev_priv(dev);
+	struct rte_kni_mbuf *pkt_kva = NULL;
+	void *pkt_pa = NULL;
+	void *pkt_va = NULL;
+
+	/* save the timestamp */
+#ifdef HAVE_TRANS_START_HELPER
+	netif_trans_update(dev);
+#else
+	dev->trans_start = jiffies;
+#endif
+
+	/* Check if the length of skb is less than mbuf size */
+	if (skb->len > kni->mbuf_size)
+		goto drop;
+
+	/**
+	 * Check if it has at least one free entry in tx_q and
+	 * one entry in alloc_q.
+	 */
+	if (kni_fifo_free_count(kni->tx_q) == 0 ||
+			kni_fifo_count(kni->alloc_q) == 0) {
+		/**
+		 * If no free entry in tx_q or no entry in alloc_q,
+		 * drops skb and goes out.
+		 */
+		goto drop;
+	}
+
+	/* dequeue a mbuf from alloc_q */
+	ret = kni_fifo_get(kni->alloc_q, &pkt_pa, 1);
+	if (likely(ret == 1)) {
+		void *data_kva;
+
+		pkt_kva = pa2kva(pkt_pa);
+		data_kva = kva2data_kva(pkt_kva);
+		pkt_va = pa2va(pkt_pa, pkt_kva);
+
+		len = skb->len;
+		memcpy(data_kva, skb->data, len);
+		if (unlikely(len < ETH_ZLEN)) {
+			memset(data_kva + len, 0, ETH_ZLEN - len);
+			len = ETH_ZLEN;
+		}
+		pkt_kva->pkt_len = len;
+		pkt_kva->data_len = len;
+
+		/* enqueue mbuf into tx_q */
+		ret = kni_fifo_put(kni->tx_q, &pkt_va, 1);
+		if (unlikely(ret != 1)) {
+			/* Failing should not happen */
+			pr_err("Fail to enqueue mbuf into tx_q\n");
+			goto drop;
+		}
+	} else {
+		/* Failing should not happen */
+		pr_err("Fail to dequeue mbuf from alloc_q\n");
+		goto drop;
+	}
+
+	/* Free skb and update statistics */
+	dev_kfree_skb(skb);
+	kni->stats.tx_bytes += len;
+	kni->stats.tx_packets++;
+
+	return NETDEV_TX_OK;
+
+drop:
+	/* Free skb and update statistics */
+	dev_kfree_skb(skb);
+	kni->stats.tx_dropped++;
+
+	return NETDEV_TX_OK;
+}
+
+/*
+ * RX: normal working mode
+ */
+static void
+kni_net_rx_normal(struct kni_dev *kni)
+{
+	uint32_t ret;
+	uint32_t len;
+	uint32_t i, num_rx, num_fq;
+	struct rte_kni_mbuf *kva;
+	void *data_kva;
+	struct sk_buff *skb;
+	struct net_device *dev = kni->net_dev;
+
+	/* Get the number of free entries in free_q */
+	num_fq = kni_fifo_free_count(kni->free_q);
+	if (num_fq == 0) {
+		/* No room on the free_q, bail out */
+		return;
+	}
+
+	/* Calculate the number of entries to dequeue from rx_q */
+	num_rx = min_t(uint32_t, num_fq, MBUF_BURST_SZ);
+
+	/* Burst dequeue from rx_q */
+	num_rx = kni_fifo_get(kni->rx_q, kni->pa, num_rx);
+	if (num_rx == 0)
+		return;
+
+	/* Transfer received packets to netif */
+	for (i = 0; i < num_rx; i++) {
+		kva = pa2kva(kni->pa[i]);
+		len = kva->pkt_len;
+		data_kva = kva2data_kva(kva);
+		kni->va[i] = pa2va(kni->pa[i], kva);
+
+		skb = dev_alloc_skb(len + 2);
+		if (!skb) {
+			/* Update statistics */
+			kni->stats.rx_dropped++;
+			continue;
+		}
+
+		/* Align IP on 16B boundary */
+		skb_reserve(skb, 2);
+
+		if (kva->nb_segs == 1) {
+			memcpy(skb_put(skb, len), data_kva, len);
+		} else {
+			int nb_segs;
+			int kva_nb_segs = kva->nb_segs;
+
+			for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
+				memcpy(skb_put(skb, kva->data_len),
+					data_kva, kva->data_len);
+
+				if (!kva->next)
+					break;
+
+				kva = pa2kva(va2pa(kva->next, kva));
+				data_kva = kva2data_kva(kva);
+			}
+		}
+
+		skb->dev = dev;
+		skb->protocol = eth_type_trans(skb, dev);
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+		/* Call netif interface */
+		netif_rx_ni(skb);
+
+		/* Update statistics */
+		kni->stats.rx_bytes += len;
+		kni->stats.rx_packets++;
+	}
+
+	/* Burst enqueue mbufs into free_q */
+	ret = kni_fifo_put(kni->free_q, kni->va, num_rx);
+	if (ret != num_rx)
+		/* Failing should not happen */
+		pr_err("Fail to enqueue entries into free_q\n");
+}
+
+/*
+ * RX: loopback with enqueue/dequeue fifos.
+ */
+static void
+kni_net_rx_lo_fifo(struct kni_dev *kni)
+{
+	uint32_t ret;
+	uint32_t len;
+	uint32_t i, num, num_rq, num_tq, num_aq, num_fq;
+	struct rte_kni_mbuf *kva;
+	void *data_kva;
+	struct rte_kni_mbuf *alloc_kva;
+	void *alloc_data_kva;
+
+	/* Get the number of entries in rx_q */
+	num_rq = kni_fifo_count(kni->rx_q);
+
+	/* Get the number of free entrie in tx_q */
+	num_tq = kni_fifo_free_count(kni->tx_q);
+
+	/* Get the number of entries in alloc_q */
+	num_aq = kni_fifo_count(kni->alloc_q);
+
+	/* Get the number of free entries in free_q */
+	num_fq = kni_fifo_free_count(kni->free_q);
+
+	/* Calculate the number of entries to be dequeued from rx_q */
+	num = min(num_rq, num_tq);
+	num = min(num, num_aq);
+	num = min(num, num_fq);
+	num = min_t(uint32_t, num, MBUF_BURST_SZ);
+
+	/* Return if no entry to dequeue from rx_q */
+	if (num == 0)
+		return;
+
+	/* Burst dequeue from rx_q */
+	ret = kni_fifo_get(kni->rx_q, kni->pa, num);
+	if (ret == 0)
+		return; /* Failing should not happen */
+
+	/* Dequeue entries from alloc_q */
+	ret = kni_fifo_get(kni->alloc_q, kni->alloc_pa, num);
+	if (ret) {
+		num = ret;
+		/* Copy mbufs */
+		for (i = 0; i < num; i++) {
+			kva = pa2kva(kni->pa[i]);
+			len = kva->pkt_len;
+			data_kva = kva2data_kva(kva);
+			kni->va[i] = pa2va(kni->pa[i], kva);
+
+			alloc_kva = pa2kva(kni->alloc_pa[i]);
+			alloc_data_kva = kva2data_kva(alloc_kva);
+			kni->alloc_va[i] = pa2va(kni->alloc_pa[i], alloc_kva);
+
+			memcpy(alloc_data_kva, data_kva, len);
+			alloc_kva->pkt_len = len;
+			alloc_kva->data_len = len;
+
+			kni->stats.tx_bytes += len;
+			kni->stats.rx_bytes += len;
+		}
+
+		/* Burst enqueue mbufs into tx_q */
+		ret = kni_fifo_put(kni->tx_q, kni->alloc_va, num);
+		if (ret != num)
+			/* Failing should not happen */
+			pr_err("Fail to enqueue mbufs into tx_q\n");
+	}
+
+	/* Burst enqueue mbufs into free_q */
+	ret = kni_fifo_put(kni->free_q, kni->va, num);
+	if (ret != num)
+		/* Failing should not happen */
+		pr_err("Fail to enqueue mbufs into free_q\n");
+
+	/**
+	 * Update statistic, and enqueue/dequeue failure is impossible,
+	 * as all queues are checked at first.
+	 */
+	kni->stats.tx_packets += num;
+	kni->stats.rx_packets += num;
+}
+
+/*
+ * RX: loopback with enqueue/dequeue fifos and sk buffer copies.
+ */
+static void
+kni_net_rx_lo_fifo_skb(struct kni_dev *kni)
+{
+	uint32_t ret;
+	uint32_t len;
+	uint32_t i, num_rq, num_fq, num;
+	struct rte_kni_mbuf *kva;
+	void *data_kva;
+	struct sk_buff *skb;
+	struct net_device *dev = kni->net_dev;
+
+	/* Get the number of entries in rx_q */
+	num_rq = kni_fifo_count(kni->rx_q);
+
+	/* Get the number of free entries in free_q */
+	num_fq = kni_fifo_free_count(kni->free_q);
+
+	/* Calculate the number of entries to dequeue from rx_q */
+	num = min(num_rq, num_fq);
+	num = min_t(uint32_t, num, MBUF_BURST_SZ);
+
+	/* Return if no entry to dequeue from rx_q */
+	if (num == 0)
+		return;
+
+	/* Burst dequeue mbufs from rx_q */
+	ret = kni_fifo_get(kni->rx_q, kni->pa, num);
+	if (ret == 0)
+		return;
+
+	/* Copy mbufs to sk buffer and then call tx interface */
+	for (i = 0; i < num; i++) {
+		kva = pa2kva(kni->pa[i]);
+		len = kva->pkt_len;
+		data_kva = kva2data_kva(kva);
+		kni->va[i] = pa2va(kni->pa[i], kva);
+
+		skb = dev_alloc_skb(len + 2);
+		if (skb) {
+			/* Align IP on 16B boundary */
+			skb_reserve(skb, 2);
+			memcpy(skb_put(skb, len), data_kva, len);
+			skb->dev = dev;
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+			dev_kfree_skb(skb);
+		}
+
+		/* Simulate real usage, allocate/copy skb twice */
+		skb = dev_alloc_skb(len + 2);
+		if (skb == NULL) {
+			kni->stats.rx_dropped++;
+			continue;
+		}
+
+		/* Align IP on 16B boundary */
+		skb_reserve(skb, 2);
+
+		if (kva->nb_segs == 1) {
+			memcpy(skb_put(skb, len), data_kva, len);
+		} else {
+			int nb_segs;
+			int kva_nb_segs = kva->nb_segs;
+
+			for (nb_segs = 0; nb_segs < kva_nb_segs; nb_segs++) {
+				memcpy(skb_put(skb, kva->data_len),
+					data_kva, kva->data_len);
+
+				if (!kva->next)
+					break;
+
+				kva = pa2kva(va2pa(kva->next, kva));
+				data_kva = kva2data_kva(kva);
+			}
+		}
+
+		skb->dev = dev;
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+		kni->stats.rx_bytes += len;
+		kni->stats.rx_packets++;
+
+		/* call tx interface */
+		kni_net_tx(skb, dev);
+	}
+
+	/* enqueue all the mbufs from rx_q into free_q */
+	ret = kni_fifo_put(kni->free_q, kni->va, num);
+	if (ret != num)
+		/* Failing should not happen */
+		pr_err("Fail to enqueue mbufs into free_q\n");
+}
+
+/* rx interface */
+void
+kni_net_rx(struct kni_dev *kni)
+{
+	/**
+	 * It doesn't need to check if it is NULL pointer,
+	 * as it has a default value
+	 */
+	(*kni_net_rx_func)(kni);
+}
+
+/*
+ * Deal with a transmit timeout.
+ */
+static void
+kni_net_tx_timeout(struct net_device *dev)
+{
+	struct kni_dev *kni = netdev_priv(dev);
+
+	pr_debug("Transmit timeout at %ld, latency %ld\n", jiffies,
+			jiffies - dev_trans_start(dev));
+
+	kni->stats.tx_errors++;
+	netif_wake_queue(dev);
+}
+
+/*
+ * Ioctl commands
+ */
+static int
+kni_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	pr_debug("kni_net_ioctl group:%d cmd:%d\n",
+		((struct kni_dev *)netdev_priv(dev))->group_id, cmd);
+
+	return 0;
+}
+
+static void
+kni_net_set_rx_mode(struct net_device *dev)
+{
+}
+
+static int
+kni_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+	int ret;
+	struct rte_kni_request req;
+	struct kni_dev *kni = netdev_priv(dev);
+
+	pr_debug("kni_net_change_mtu new mtu %d to be set\n", new_mtu);
+
+	memset(&req, 0, sizeof(req));
+	req.req_id = RTE_KNI_REQ_CHANGE_MTU;
+	req.new_mtu = new_mtu;
+	ret = kni_net_process_request(kni, &req);
+	if (ret == 0 && req.result == 0)
+		dev->mtu = new_mtu;
+
+	return (ret == 0) ? req.result : ret;
+}
+
+static void
+kni_net_set_promiscusity(struct net_device *netdev, int flags)
+{
+	struct rte_kni_request req;
+	struct kni_dev *kni = netdev_priv(netdev);
+
+	memset(&req, 0, sizeof(req));
+	req.req_id = RTE_KNI_REQ_CHANGE_PROMISC;
+
+	if (netdev->flags & IFF_PROMISC)
+		req.promiscusity = 1;
+	else
+		req.promiscusity = 0;
+	kni_net_process_request(kni, &req);
+}
+
+/*
+ * Checks if the user space application provided the resp message
+ */
+void
+kni_net_poll_resp(struct kni_dev *kni)
+{
+	if (kni_fifo_count(kni->resp_q))
+		wake_up_interruptible(&kni->wq);
+}
+
+/*
+ * Return statistics to the caller
+ */
+static struct net_device_stats *
+kni_net_stats(struct net_device *dev)
+{
+	struct kni_dev *kni = netdev_priv(dev);
+
+	return &kni->stats;
+}
+
+/*
+ *  Fill the eth header
+ */
+static int
+kni_net_header(struct sk_buff *skb, struct net_device *dev,
+		unsigned short type, const void *daddr,
+		const void *saddr, uint32_t len)
+{
+	struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
+
+	memcpy(eth->h_source, saddr ? saddr : dev->dev_addr, dev->addr_len);
+	memcpy(eth->h_dest,   daddr ? daddr : dev->dev_addr, dev->addr_len);
+	eth->h_proto = htons(type);
+
+	return dev->hard_header_len;
+}
+
+/*
+ * Re-fill the eth header
+ */
+#ifdef HAVE_REBUILD_HEADER
+static int
+kni_net_rebuild_header(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	struct ethhdr *eth = (struct ethhdr *) skb->data;
+
+	memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+	memcpy(eth->h_dest, dev->dev_addr, dev->addr_len);
+
+	return 0;
+}
+#endif /* < 4.1.0  */
+
+/**
+ * kni_net_set_mac - Change the Ethernet Address of the KNI NIC
+ * @netdev: network interface device structure
+ * @p: pointer to an address structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+static int
+kni_net_set_mac(struct net_device *netdev, void *p)
+{
+	int ret;
+	struct rte_kni_request req;
+	struct kni_dev *kni;
+	struct sockaddr *addr = p;
+
+	memset(&req, 0, sizeof(req));
+	req.req_id = RTE_KNI_REQ_CHANGE_MAC_ADDR;
+
+	if (!is_valid_ether_addr((unsigned char *)(addr->sa_data)))
+		return -EADDRNOTAVAIL;
+
+	memcpy(req.mac_addr, addr->sa_data, netdev->addr_len);
+	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+
+	kni = netdev_priv(netdev);
+	ret = kni_net_process_request(kni, &req);
+
+	return (ret == 0 ? req.result : ret);
+}
+
+#ifdef HAVE_CHANGE_CARRIER_CB
+static int
+kni_net_change_carrier(struct net_device *dev, bool new_carrier)
+{
+	if (new_carrier)
+		netif_carrier_on(dev);
+	else
+		netif_carrier_off(dev);
+	return 0;
+}
+#endif
+
+static const struct header_ops kni_net_header_ops = {
+	.create  = kni_net_header,
+#ifdef HAVE_REBUILD_HEADER
+	.rebuild = kni_net_rebuild_header,
+#endif /* < 4.1.0  */
+	.cache   = NULL,  /* disable caching */
+};
+
+static const struct net_device_ops kni_net_netdev_ops = {
+	.ndo_open = kni_net_open,
+	.ndo_stop = kni_net_release,
+	.ndo_set_config = kni_net_config,
+	.ndo_change_rx_flags = kni_net_set_promiscusity,
+	.ndo_start_xmit = kni_net_tx,
+	.ndo_change_mtu = kni_net_change_mtu,
+	.ndo_do_ioctl = kni_net_ioctl,
+	.ndo_set_rx_mode = kni_net_set_rx_mode,
+	.ndo_get_stats = kni_net_stats,
+	.ndo_tx_timeout = kni_net_tx_timeout,
+	.ndo_set_mac_address = kni_net_set_mac,
+#ifdef HAVE_CHANGE_CARRIER_CB
+	.ndo_change_carrier = kni_net_change_carrier,
+#endif
+};
+
+void
+kni_net_init(struct net_device *dev)
+{
+	struct kni_dev *kni = netdev_priv(dev);
+
+	init_waitqueue_head(&kni->wq);
+	mutex_init(&kni->sync_lock);
+
+	ether_setup(dev); /* assign some of the fields */
+	dev->netdev_ops      = &kni_net_netdev_ops;
+	dev->header_ops      = &kni_net_header_ops;
+	dev->watchdog_timeo = WD_TIMEOUT;
+}
+
+void
+kni_net_config_lo_mode(char *lo_str)
+{
+	if (!lo_str) {
+		pr_debug("loopback disabled");
+		return;
+	}
+
+	if (!strcmp(lo_str, "lo_mode_none"))
+		pr_debug("loopback disabled");
+	else if (!strcmp(lo_str, "lo_mode_fifo")) {
+		pr_debug("loopback mode=lo_mode_fifo enabled");
+		kni_net_rx_func = kni_net_rx_lo_fifo;
+	} else if (!strcmp(lo_str, "lo_mode_fifo_skb")) {
+		pr_debug("loopback mode=lo_mode_fifo_skb enabled");
+		kni_net_rx_func = kni_net_rx_lo_fifo_skb;
+	} else
+		pr_debug("Incognizant parameter, loopback disabled");
+}