+++ /dev/null
-// 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;
-}
-
-/*
- * 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");
-}
Code Review / deb_dpdk.git / blobdiff