diff options
Diffstat (limited to 'drivers/net/tap/rte_eth_tap.c')
| -rw-r--r-- | drivers/net/tap/rte_eth_tap.c | 1394 |
1 files changed, 1394 insertions, 0 deletions
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c new file mode 100644 index 00000000..e44de027 --- /dev/null +++ b/drivers/net/tap/rte_eth_tap.c @@ -0,0 +1,1394 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2016 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <rte_atomic.h> +#include <rte_branch_prediction.h> +#include <rte_common.h> +#include <rte_mbuf.h> +#include <rte_ethdev.h> +#include <rte_ethdev_vdev.h> +#include <rte_malloc.h> +#include <rte_vdev.h> +#include <rte_kvargs.h> +#include <rte_net.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <sys/utsname.h> +#include <sys/mman.h> +#include <errno.h> +#include <signal.h> +#include <stdint.h> +#include <sys/uio.h> +#include <unistd.h> +#include <arpa/inet.h> +#include <net/if.h> +#include <linux/if_tun.h> +#include <linux/if_ether.h> +#include <linux/version.h> +#include <fcntl.h> + +#include <rte_eth_tap.h> +#include <tap_flow.h> +#include <tap_netlink.h> +#include <tap_tcmsgs.h> + +/* Linux based path to the TUN device */ +#define TUN_TAP_DEV_PATH "/dev/net/tun" +#define DEFAULT_TAP_NAME "dtap" + +#define ETH_TAP_IFACE_ARG "iface" +#define ETH_TAP_SPEED_ARG "speed" +#define ETH_TAP_REMOTE_ARG "remote" + +#define FLOWER_KERNEL_VERSION KERNEL_VERSION(4, 2, 0) +#define FLOWER_VLAN_KERNEL_VERSION KERNEL_VERSION(4, 9, 0) + +static struct rte_vdev_driver pmd_tap_drv; + +static const char *valid_arguments[] = { + ETH_TAP_IFACE_ARG, + ETH_TAP_SPEED_ARG, + ETH_TAP_REMOTE_ARG, + NULL +}; + +static int tap_unit; + +static volatile uint32_t tap_trigger; /* Rx trigger */ + +static struct rte_eth_link pmd_link = { + .link_speed = ETH_SPEED_NUM_10G, + .link_duplex = ETH_LINK_FULL_DUPLEX, + .link_status = ETH_LINK_DOWN, + .link_autoneg = ETH_LINK_SPEED_AUTONEG +}; + +static void +tap_trigger_cb(int sig __rte_unused) +{ + /* Valid trigger values are nonzero */ + tap_trigger = (tap_trigger + 1) | 0x80000000; +} + +/* Specifies on what netdevices the ioctl should be applied */ +enum ioctl_mode { + LOCAL_AND_REMOTE, + LOCAL_ONLY, + REMOTE_ONLY, +}; + +static int +tap_ioctl(struct pmd_internals *pmd, unsigned long request, + struct ifreq *ifr, int set, enum ioctl_mode mode); + +static int tap_intr_handle_set(struct rte_eth_dev *dev, int set); + +/* Tun/Tap allocation routine + * + * name is the number of the interface to use, unless NULL to take the host + * supplied name. + */ +static int +tun_alloc(struct pmd_internals *pmd, uint16_t qid) +{ + struct ifreq ifr; +#ifdef IFF_MULTI_QUEUE + unsigned int features; +#endif + int fd; + + memset(&ifr, 0, sizeof(struct ifreq)); + + /* + * Do not set IFF_NO_PI as packet information header will be needed + * to check if a received packet has been truncated. + */ + ifr.ifr_flags = IFF_TAP; + snprintf(ifr.ifr_name, IFNAMSIZ, "%s", pmd->name); + + RTE_LOG(DEBUG, PMD, "ifr_name '%s'\n", ifr.ifr_name); + + fd = open(TUN_TAP_DEV_PATH, O_RDWR); + if (fd < 0) { + RTE_LOG(ERR, PMD, "Unable to create TAP interface"); + goto error; + } + +#ifdef IFF_MULTI_QUEUE + /* Grab the TUN features to verify we can work multi-queue */ + if (ioctl(fd, TUNGETFEATURES, &features) < 0) { + RTE_LOG(ERR, PMD, "TAP unable to get TUN/TAP features\n"); + goto error; + } + RTE_LOG(DEBUG, PMD, " TAP Features %08x\n", features); + + if (features & IFF_MULTI_QUEUE) { + RTE_LOG(DEBUG, PMD, " Multi-queue support for %d queues\n", + RTE_PMD_TAP_MAX_QUEUES); + ifr.ifr_flags |= IFF_MULTI_QUEUE; + } else +#endif + { + ifr.ifr_flags |= IFF_ONE_QUEUE; + RTE_LOG(DEBUG, PMD, " Single queue only support\n"); + } + + /* Set the TUN/TAP configuration and set the name if needed */ + if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) { + RTE_LOG(WARNING, PMD, + "Unable to set TUNSETIFF for %s\n", + ifr.ifr_name); + perror("TUNSETIFF"); + goto error; + } + + /* Always set the file descriptor to non-blocking */ + if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { + RTE_LOG(WARNING, PMD, + "Unable to set %s to nonblocking\n", + ifr.ifr_name); + perror("F_SETFL, NONBLOCK"); + goto error; + } + + /* Set up trigger to optimize empty Rx bursts */ + errno = 0; + do { + struct sigaction sa; + int flags = fcntl(fd, F_GETFL); + + if (flags == -1 || sigaction(SIGIO, NULL, &sa) == -1) + break; + if (sa.sa_handler != tap_trigger_cb) { + /* + * Make sure SIGIO is not already taken. This is done + * as late as possible to leave the application a + * chance to set up its own signal handler first. + */ + if (sa.sa_handler != SIG_IGN && + sa.sa_handler != SIG_DFL) { + errno = EBUSY; + break; + } + sa = (struct sigaction){ + .sa_flags = SA_RESTART, + .sa_handler = tap_trigger_cb, + }; + if (sigaction(SIGIO, &sa, NULL) == -1) + break; + } + /* Enable SIGIO on file descriptor */ + fcntl(fd, F_SETFL, flags | O_ASYNC); + fcntl(fd, F_SETOWN, getpid()); + } while (0); + if (errno) { + /* Disable trigger globally in case of error */ + tap_trigger = 0; + RTE_LOG(WARNING, PMD, "Rx trigger disabled: %s\n", + strerror(errno)); + } + + if (qid == 0) { + struct ifreq ifr; + + /* + * pmd->eth_addr contains the desired MAC, either from remote + * or from a random assignment. Sync it with the tap netdevice. + */ + ifr.ifr_hwaddr.sa_family = AF_LOCAL; + rte_memcpy(ifr.ifr_hwaddr.sa_data, &pmd->eth_addr, + ETHER_ADDR_LEN); + if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) + goto error; + + pmd->if_index = if_nametoindex(pmd->name); + if (!pmd->if_index) { + RTE_LOG(ERR, PMD, + "Could not find ifindex for %s: rte_flow won't be usable.\n", + pmd->name); + return fd; + } + if (!pmd->flower_support) + return fd; + if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) { + RTE_LOG(ERR, PMD, + "Could not create multiq qdisc for %s: rte_flow won't be usable.\n", + pmd->name); + return fd; + } + if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) { + RTE_LOG(ERR, PMD, + "Could not create multiq qdisc for %s: rte_flow won't be usable.\n", + pmd->name); + return fd; + } + if (pmd->remote_if_index) { + /* + * Flush usually returns negative value because it tries + * to delete every QDISC (and on a running device, one + * QDISC at least is needed). Ignore negative return + * value. + */ + qdisc_flush(pmd->nlsk_fd, pmd->remote_if_index); + if (qdisc_create_ingress(pmd->nlsk_fd, + pmd->remote_if_index) < 0) + goto remote_fail; + LIST_INIT(&pmd->implicit_flows); + if (tap_flow_implicit_create( + pmd, TAP_REMOTE_LOCAL_MAC) < 0) + goto remote_fail; + if (tap_flow_implicit_create( + pmd, TAP_REMOTE_BROADCAST) < 0) + goto remote_fail; + if (tap_flow_implicit_create( + pmd, TAP_REMOTE_BROADCASTV6) < 0) + goto remote_fail; + if (tap_flow_implicit_create( + pmd, TAP_REMOTE_TX) < 0) + goto remote_fail; + } + } + + return fd; + +remote_fail: + RTE_LOG(ERR, PMD, + "Could not set up remote flow rules for %s: remote disabled.\n", + pmd->name); + pmd->remote_if_index = 0; + tap_flow_implicit_flush(pmd, NULL); + return fd; + +error: + if (fd > 0) + close(fd); + return -1; +} + +/* Callback to handle the rx burst of packets to the correct interface and + * file descriptor(s) in a multi-queue setup. + */ +static uint16_t +pmd_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) +{ + struct rx_queue *rxq = queue; + uint16_t num_rx; + unsigned long num_rx_bytes = 0; + uint32_t trigger = tap_trigger; + + if (trigger == rxq->trigger_seen) + return 0; + if (trigger) + rxq->trigger_seen = trigger; + rte_compiler_barrier(); + for (num_rx = 0; num_rx < nb_pkts; ) { + struct rte_mbuf *mbuf = rxq->pool; + struct rte_mbuf *seg = NULL; + struct rte_mbuf *new_tail = NULL; + uint16_t data_off = rte_pktmbuf_headroom(mbuf); + int len; + + len = readv(rxq->fd, *rxq->iovecs, + 1 + (rxq->rxmode->enable_scatter ? + rxq->nb_rx_desc : 1)); + if (len < (int)sizeof(struct tun_pi)) + break; + + /* Packet couldn't fit in the provided mbuf */ + if (unlikely(rxq->pi.flags & TUN_PKT_STRIP)) { + rxq->stats.ierrors++; + continue; + } + + len -= sizeof(struct tun_pi); + + mbuf->pkt_len = len; + mbuf->port = rxq->in_port; + while (1) { + struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp); + + if (unlikely(!buf)) { + rxq->stats.rx_nombuf++; + /* No new buf has been allocated: do nothing */ + if (!new_tail || !seg) + goto end; + + seg->next = NULL; + rte_pktmbuf_free(mbuf); + + goto end; + } + seg = seg ? seg->next : mbuf; + if (rxq->pool == mbuf) + rxq->pool = buf; + if (new_tail) + new_tail->next = buf; + new_tail = buf; + new_tail->next = seg->next; + + /* iovecs[0] is reserved for packet info (pi) */ + (*rxq->iovecs)[mbuf->nb_segs].iov_len = + buf->buf_len - data_off; + (*rxq->iovecs)[mbuf->nb_segs].iov_base = + (char *)buf->buf_addr + data_off; + + seg->data_len = RTE_MIN(seg->buf_len - data_off, len); + seg->data_off = data_off; + + len -= seg->data_len; + if (len <= 0) + break; + mbuf->nb_segs++; + /* First segment has headroom, not the others */ + data_off = 0; + } + seg->next = NULL; + mbuf->packet_type = rte_net_get_ptype(mbuf, NULL, + RTE_PTYPE_ALL_MASK); + + /* account for the receive frame */ + bufs[num_rx++] = mbuf; + num_rx_bytes += mbuf->pkt_len; + } +end: + rxq->stats.ipackets += num_rx; + rxq->stats.ibytes += num_rx_bytes; + + return num_rx; +} + +/* Callback to handle sending packets from the tap interface + */ +static uint16_t +pmd_tx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts) +{ + struct tx_queue *txq = queue; + uint16_t num_tx = 0; + unsigned long num_tx_bytes = 0; + uint32_t max_size; + int i; + + if (unlikely(nb_pkts == 0)) + return 0; + + max_size = *txq->mtu + (ETHER_HDR_LEN + ETHER_CRC_LEN + 4); + for (i = 0; i < nb_pkts; i++) { + struct rte_mbuf *mbuf = bufs[num_tx]; + struct iovec iovecs[mbuf->nb_segs + 1]; + struct tun_pi pi = { .flags = 0 }; + struct rte_mbuf *seg = mbuf; + int n; + int j; + + /* stats.errs will be incremented */ + if (rte_pktmbuf_pkt_len(mbuf) > max_size) + break; + + iovecs[0].iov_base = π + iovecs[0].iov_len = sizeof(pi); + for (j = 1; j <= mbuf->nb_segs; j++) { + iovecs[j].iov_len = rte_pktmbuf_data_len(seg); + iovecs[j].iov_base = + rte_pktmbuf_mtod(seg, void *); + seg = seg->next; + } + /* copy the tx frame data */ + n = writev(txq->fd, iovecs, mbuf->nb_segs + 1); + if (n <= 0) + break; + + num_tx++; + num_tx_bytes += mbuf->pkt_len; + rte_pktmbuf_free(mbuf); + } + + txq->stats.opackets += num_tx; + txq->stats.errs += nb_pkts - num_tx; + txq->stats.obytes += num_tx_bytes; + + return num_tx; +} + +static int +tap_ioctl(struct pmd_internals *pmd, unsigned long request, + struct ifreq *ifr, int set, enum ioctl_mode mode) +{ + short req_flags = ifr->ifr_flags; + int remote = pmd->remote_if_index && + (mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE); + + if (!pmd->remote_if_index && mode == REMOTE_ONLY) + return 0; + /* + * If there is a remote netdevice, apply ioctl on it, then apply it on + * the tap netdevice. + */ +apply: + if (remote) + snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->remote_iface); + else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE) + snprintf(ifr->ifr_name, IFNAMSIZ, "%s", pmd->name); + switch (request) { + case SIOCSIFFLAGS: + /* fetch current flags to leave other flags untouched */ + if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0) + goto error; + if (set) + ifr->ifr_flags |= req_flags; + else + ifr->ifr_flags &= ~req_flags; + break; + case SIOCGIFFLAGS: + case SIOCGIFHWADDR: + case SIOCSIFHWADDR: + case SIOCSIFMTU: + break; + default: + RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n", + pmd->name); + return -EINVAL; + } + if (ioctl(pmd->ioctl_sock, request, ifr) < 0) + goto error; + if (remote-- && mode == LOCAL_AND_REMOTE) + goto apply; + return 0; + +error: + RTE_LOG(ERR, PMD, "%s: ioctl(%lu) failed with error: %s\n", + ifr->ifr_name, request, strerror(errno)); + return -errno; +} + +static int +tap_link_set_down(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_UP }; + + dev->data->dev_link.link_status = ETH_LINK_DOWN; + return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE); +} + +static int +tap_link_set_up(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_UP }; + + dev->data->dev_link.link_status = ETH_LINK_UP; + return tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE); +} + +static int +tap_dev_start(struct rte_eth_dev *dev) +{ + int err; + + err = tap_intr_handle_set(dev, 1); + if (err) + return err; + return tap_link_set_up(dev); +} + +/* This function gets called when the current port gets stopped. + */ +static void +tap_dev_stop(struct rte_eth_dev *dev) +{ + tap_intr_handle_set(dev, 0); + tap_link_set_down(dev); +} + +static int +tap_dev_configure(struct rte_eth_dev *dev __rte_unused) +{ + return 0; +} + +static uint32_t +tap_dev_speed_capa(void) +{ + uint32_t speed = pmd_link.link_speed; + uint32_t capa = 0; + + if (speed >= ETH_SPEED_NUM_10M) + capa |= ETH_LINK_SPEED_10M; + if (speed >= ETH_SPEED_NUM_100M) + capa |= ETH_LINK_SPEED_100M; + if (speed >= ETH_SPEED_NUM_1G) + capa |= ETH_LINK_SPEED_1G; + if (speed >= ETH_SPEED_NUM_5G) + capa |= ETH_LINK_SPEED_2_5G; + if (speed >= ETH_SPEED_NUM_5G) + capa |= ETH_LINK_SPEED_5G; + if (speed >= ETH_SPEED_NUM_10G) + capa |= ETH_LINK_SPEED_10G; + if (speed >= ETH_SPEED_NUM_20G) + capa |= ETH_LINK_SPEED_20G; + if (speed >= ETH_SPEED_NUM_25G) + capa |= ETH_LINK_SPEED_25G; + if (speed >= ETH_SPEED_NUM_40G) + capa |= ETH_LINK_SPEED_40G; + if (speed >= ETH_SPEED_NUM_50G) + capa |= ETH_LINK_SPEED_50G; + if (speed >= ETH_SPEED_NUM_56G) + capa |= ETH_LINK_SPEED_56G; + if (speed >= ETH_SPEED_NUM_100G) + capa |= ETH_LINK_SPEED_100G; + + return capa; +} + +static void +tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) +{ + struct pmd_internals *internals = dev->data->dev_private; + + dev_info->if_index = internals->if_index; + dev_info->max_mac_addrs = 1; + dev_info->max_rx_pktlen = (uint32_t)ETHER_MAX_VLAN_FRAME_LEN; + dev_info->max_rx_queues = internals->nb_queues; + dev_info->max_tx_queues = internals->nb_queues; + dev_info->min_rx_bufsize = 0; + dev_info->pci_dev = NULL; + dev_info->speed_capa = tap_dev_speed_capa(); +} + +static void +tap_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *tap_stats) +{ + unsigned int i, imax; + unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0; + unsigned long rx_bytes_total = 0, tx_bytes_total = 0; + unsigned long rx_nombuf = 0, ierrors = 0; + const struct pmd_internals *pmd = dev->data->dev_private; + + imax = (pmd->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS) ? + pmd->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS; + + for (i = 0; i < imax; i++) { + tap_stats->q_ipackets[i] = pmd->rxq[i].stats.ipackets; + tap_stats->q_ibytes[i] = pmd->rxq[i].stats.ibytes; + rx_total += tap_stats->q_ipackets[i]; + rx_bytes_total += tap_stats->q_ibytes[i]; + rx_nombuf += pmd->rxq[i].stats.rx_nombuf; + ierrors += pmd->rxq[i].stats.ierrors; + + tap_stats->q_opackets[i] = pmd->txq[i].stats.opackets; + tap_stats->q_errors[i] = pmd->txq[i].stats.errs; + tap_stats->q_obytes[i] = pmd->txq[i].stats.obytes; + tx_total += tap_stats->q_opackets[i]; + tx_err_total += tap_stats->q_errors[i]; + tx_bytes_total += tap_stats->q_obytes[i]; + } + + tap_stats->ipackets = rx_total; + tap_stats->ibytes = rx_bytes_total; + tap_stats->ierrors = ierrors; + tap_stats->rx_nombuf = rx_nombuf; + tap_stats->opackets = tx_total; + tap_stats->oerrors = tx_err_total; + tap_stats->obytes = tx_bytes_total; +} + +static void +tap_stats_reset(struct rte_eth_dev *dev) +{ + int i; + struct pmd_internals *pmd = dev->data->dev_private; + + for (i = 0; i < pmd->nb_queues; i++) { + pmd->rxq[i].stats.ipackets = 0; + pmd->rxq[i].stats.ibytes = 0; + pmd->rxq[i].stats.ierrors = 0; + pmd->rxq[i].stats.rx_nombuf = 0; + + pmd->txq[i].stats.opackets = 0; + pmd->txq[i].stats.errs = 0; + pmd->txq[i].stats.obytes = 0; + } +} + +static void +tap_dev_close(struct rte_eth_dev *dev __rte_unused) +{ + int i; + struct pmd_internals *internals = dev->data->dev_private; + + tap_link_set_down(dev); + tap_flow_flush(dev, NULL); + tap_flow_implicit_flush(internals, NULL); + + for (i = 0; i < internals->nb_queues; i++) { + if (internals->rxq[i].fd != -1) + close(internals->rxq[i].fd); + internals->rxq[i].fd = -1; + internals->txq[i].fd = -1; + } +} + +static void +tap_rx_queue_release(void *queue) +{ + struct rx_queue *rxq = queue; + + if (rxq && (rxq->fd > 0)) { + close(rxq->fd); + rxq->fd = -1; + rte_pktmbuf_free(rxq->pool); + rte_free(rxq->iovecs); + rxq->pool = NULL; + rxq->iovecs = NULL; + } +} + +static void +tap_tx_queue_release(void *queue) +{ + struct tx_queue *txq = queue; + + if (txq && (txq->fd > 0)) { + close(txq->fd); + txq->fd = -1; + } +} + +static int +tap_link_update(struct rte_eth_dev *dev, int wait_to_complete __rte_unused) +{ + struct rte_eth_link *dev_link = &dev->data->dev_link; + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = 0 }; + + if (pmd->remote_if_index) { + tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, REMOTE_ONLY); + if (!(ifr.ifr_flags & IFF_UP) || + !(ifr.ifr_flags & IFF_RUNNING)) { + dev_link->link_status = ETH_LINK_DOWN; + return 0; + } + } + tap_ioctl(pmd, SIOCGIFFLAGS, &ifr, 0, LOCAL_ONLY); + dev_link->link_status = + ((ifr.ifr_flags & IFF_UP) && (ifr.ifr_flags & IFF_RUNNING) ? + ETH_LINK_UP : + ETH_LINK_DOWN); + return 0; +} + +static void +tap_promisc_enable(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_PROMISC }; + + dev->data->promiscuous = 1; + tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE); + if (pmd->remote_if_index) + tap_flow_implicit_create(pmd, TAP_REMOTE_PROMISC); +} + +static void +tap_promisc_disable(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_PROMISC }; + + dev->data->promiscuous = 0; + tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE); + if (pmd->remote_if_index) + tap_flow_implicit_destroy(pmd, TAP_REMOTE_PROMISC); +} + +static void +tap_allmulti_enable(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI }; + + dev->data->all_multicast = 1; + tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 1, LOCAL_AND_REMOTE); + if (pmd->remote_if_index) + tap_flow_implicit_create(pmd, TAP_REMOTE_ALLMULTI); +} + +static void +tap_allmulti_disable(struct rte_eth_dev *dev) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_flags = IFF_ALLMULTI }; + + dev->data->all_multicast = 0; + tap_ioctl(pmd, SIOCSIFFLAGS, &ifr, 0, LOCAL_AND_REMOTE); + if (pmd->remote_if_index) + tap_flow_implicit_destroy(pmd, TAP_REMOTE_ALLMULTI); +} + + +static void +tap_mac_set(struct rte_eth_dev *dev, struct ether_addr *mac_addr) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr; + + if (is_zero_ether_addr(mac_addr)) { + RTE_LOG(ERR, PMD, "%s: can't set an empty MAC address\n", + dev->data->name); + return; + } + /* Check the actual current MAC address on the tap netdevice */ + if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, LOCAL_ONLY) != 0) { + RTE_LOG(ERR, PMD, + "%s: couldn't check current tap MAC address\n", + dev->data->name); + return; + } + if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data, + mac_addr)) + return; + + ifr.ifr_hwaddr.sa_family = AF_LOCAL; + rte_memcpy(ifr.ifr_hwaddr.sa_data, mac_addr, ETHER_ADDR_LEN); + if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 1, LOCAL_AND_REMOTE) < 0) + return; + rte_memcpy(&pmd->eth_addr, mac_addr, ETHER_ADDR_LEN); + if (pmd->remote_if_index) { + /* Replace MAC redirection rule after a MAC change */ + if (tap_flow_implicit_destroy(pmd, TAP_REMOTE_LOCAL_MAC) < 0) { + RTE_LOG(ERR, PMD, + "%s: Couldn't delete MAC redirection rule\n", + dev->data->name); + return; + } + if (tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0) + RTE_LOG(ERR, PMD, + "%s: Couldn't add MAC redirection rule\n", + dev->data->name); + } +} + +static int +tap_setup_queue(struct rte_eth_dev *dev, + struct pmd_internals *internals, + uint16_t qid) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct rx_queue *rx = &internals->rxq[qid]; + struct tx_queue *tx = &internals->txq[qid]; + int fd; + + fd = rx->fd; + if (fd < 0) { + fd = tx->fd; + if (fd < 0) { + RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n", + pmd->name, qid); + fd = tun_alloc(pmd, qid); + if (fd < 0) { + RTE_LOG(ERR, PMD, "tun_alloc(%s, %d) failed\n", + pmd->name, qid); + return -1; + } + if (qid == 0) { + struct ifreq ifr; + + ifr.ifr_mtu = dev->data->mtu; + if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, + LOCAL_AND_REMOTE) < 0) { + close(fd); + return -1; + } + } + } + } + + rx->fd = fd; + tx->fd = fd; + tx->mtu = &dev->data->mtu; + rx->rxmode = &dev->data->dev_conf.rxmode; + + return fd; +} + +static int +rx_setup_queue(struct rte_eth_dev *dev, + struct pmd_internals *internals, + uint16_t qid) +{ + dev->data->rx_queues[qid] = &internals->rxq[qid]; + + return tap_setup_queue(dev, internals, qid); +} + +static int +tx_setup_queue(struct rte_eth_dev *dev, + struct pmd_internals *internals, + uint16_t qid) +{ + dev->data->tx_queues[qid] = &internals->txq[qid]; + + return tap_setup_queue(dev, internals, qid); +} + +static int +tap_rx_queue_setup(struct rte_eth_dev *dev, + uint16_t rx_queue_id, + uint16_t nb_rx_desc, + unsigned int socket_id, + const struct rte_eth_rxconf *rx_conf __rte_unused, + struct rte_mempool *mp) +{ + struct pmd_internals *internals = dev->data->dev_private; + struct rx_queue *rxq = &internals->rxq[rx_queue_id]; + struct rte_mbuf **tmp = &rxq->pool; + long iov_max = sysconf(_SC_IOV_MAX); + uint16_t nb_desc = RTE_MIN(nb_rx_desc, iov_max - 1); + struct iovec (*iovecs)[nb_desc + 1]; + int data_off = RTE_PKTMBUF_HEADROOM; + int ret = 0; + int fd; + int i; + + if ((rx_queue_id >= internals->nb_queues) || !mp) { + RTE_LOG(WARNING, PMD, + "nb_queues %d too small or mempool NULL\n", + internals->nb_queues); + return -1; + } + + rxq->mp = mp; + rxq->trigger_seen = 1; /* force initial burst */ + rxq->in_port = dev->data->port_id; + rxq->nb_rx_desc = nb_desc; + iovecs = rte_zmalloc_socket(dev->data->name, sizeof(*iovecs), 0, + socket_id); + if (!iovecs) { + RTE_LOG(WARNING, PMD, + "%s: Couldn't allocate %d RX descriptors\n", + dev->data->name, nb_desc); + return -ENOMEM; + } + rxq->iovecs = iovecs; + + fd = rx_setup_queue(dev, internals, rx_queue_id); + if (fd == -1) { + ret = fd; + goto error; + } + + (*rxq->iovecs)[0].iov_len = sizeof(struct tun_pi); + (*rxq->iovecs)[0].iov_base = &rxq->pi; + + for (i = 1; i <= nb_desc; i++) { + *tmp = rte_pktmbuf_alloc(rxq->mp); + if (!*tmp) { + RTE_LOG(WARNING, PMD, + "%s: couldn't allocate memory for queue %d\n", + dev->data->name, rx_queue_id); + ret = -ENOMEM; + goto error; + } + (*rxq->iovecs)[i].iov_len = (*tmp)->buf_len - data_off; + (*rxq->iovecs)[i].iov_base = + (char *)(*tmp)->buf_addr + data_off; + data_off = 0; + tmp = &(*tmp)->next; + } + + RTE_LOG(DEBUG, PMD, " RX TAP device name %s, qid %d on fd %d\n", + internals->name, rx_queue_id, internals->rxq[rx_queue_id].fd); + + return 0; + +error: + rte_pktmbuf_free(rxq->pool); + rxq->pool = NULL; + rte_free(rxq->iovecs); + rxq->iovecs = NULL; + return ret; +} + +static int +tap_tx_queue_setup(struct rte_eth_dev *dev, + uint16_t tx_queue_id, + uint16_t nb_tx_desc __rte_unused, + unsigned int socket_id __rte_unused, + const struct rte_eth_txconf *tx_conf __rte_unused) +{ + struct pmd_internals *internals = dev->data->dev_private; + int ret; + + if (tx_queue_id >= internals->nb_queues) + return -1; + + ret = tx_setup_queue(dev, internals, tx_queue_id); + if (ret == -1) + return -1; + + RTE_LOG(DEBUG, PMD, " TX TAP device name %s, qid %d on fd %d\n", + internals->name, tx_queue_id, internals->txq[tx_queue_id].fd); + + return 0; +} + +static int +tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu) +{ + struct pmd_internals *pmd = dev->data->dev_private; + struct ifreq ifr = { .ifr_mtu = mtu }; + int err = 0; + + err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE); + if (!err) + dev->data->mtu = mtu; + + return err; +} + +static int +tap_set_mc_addr_list(struct rte_eth_dev *dev __rte_unused, + struct ether_addr *mc_addr_set __rte_unused, + uint32_t nb_mc_addr __rte_unused) +{ + /* + * Nothing to do actually: the tap has no filtering whatsoever, every + * packet is received. + */ + return 0; +} + +static int +tap_nl_msg_handler(struct nlmsghdr *nh, void *arg) +{ + struct rte_eth_dev *dev = arg; + struct pmd_internals *pmd = dev->data->dev_private; + struct ifinfomsg *info = NLMSG_DATA(nh); + + if (nh->nlmsg_type != RTM_NEWLINK || + (info->ifi_index != pmd->if_index && + info->ifi_index != pmd->remote_if_index)) + return 0; + return tap_link_update(dev, 0); +} + +static void +tap_dev_intr_handler(void *cb_arg) +{ + struct rte_eth_dev *dev = cb_arg; + struct pmd_internals *pmd = dev->data->dev_private; + + nl_recv(pmd->intr_handle.fd, tap_nl_msg_handler, dev); +} + +static int +tap_intr_handle_set(struct rte_eth_dev *dev, int set) +{ + struct pmd_internals *pmd = dev->data->dev_private; + + /* In any case, disable interrupt if the conf is no longer there. */ + if (!dev->data->dev_conf.intr_conf.lsc) { + if (pmd->intr_handle.fd != -1) + nl_final(pmd->intr_handle.fd); + rte_intr_callback_unregister( + &pmd->intr_handle, tap_dev_intr_handler, dev); + return 0; + } + if (set) { + pmd->intr_handle.fd = nl_init(RTMGRP_LINK); + if (unlikely(pmd->intr_handle.fd == -1)) + return -EBADF; + return rte_intr_callback_register( + &pmd->intr_handle, tap_dev_intr_handler, dev); + } + nl_final(pmd->intr_handle.fd); + return rte_intr_callback_unregister(&pmd->intr_handle, + tap_dev_intr_handler, dev); +} + +static const uint32_t* +tap_dev_supported_ptypes_get(struct rte_eth_dev *dev __rte_unused) +{ + static const uint32_t ptypes[] = { + RTE_PTYPE_INNER_L2_ETHER, + RTE_PTYPE_INNER_L2_ETHER_VLAN, + RTE_PTYPE_INNER_L2_ETHER_QINQ, + RTE_PTYPE_INNER_L3_IPV4, + RTE_PTYPE_INNER_L3_IPV4_EXT, + RTE_PTYPE_INNER_L3_IPV6, + RTE_PTYPE_INNER_L3_IPV6_EXT, + RTE_PTYPE_INNER_L4_FRAG, + RTE_PTYPE_INNER_L4_UDP, + RTE_PTYPE_INNER_L4_TCP, + RTE_PTYPE_INNER_L4_SCTP, + RTE_PTYPE_L2_ETHER, + RTE_PTYPE_L2_ETHER_VLAN, + RTE_PTYPE_L2_ETHER_QINQ, + RTE_PTYPE_L3_IPV4, + RTE_PTYPE_L3_IPV4_EXT, + RTE_PTYPE_L3_IPV6_EXT, + RTE_PTYPE_L3_IPV6, + RTE_PTYPE_L4_FRAG, + RTE_PTYPE_L4_UDP, + RTE_PTYPE_L4_TCP, + RTE_PTYPE_L4_SCTP, + }; + + return ptypes; +} + +static int +tap_flow_ctrl_get(struct rte_eth_dev *dev __rte_unused, + struct rte_eth_fc_conf *fc_conf) +{ + fc_conf->mode = RTE_FC_NONE; + return 0; +} + +static int +tap_flow_ctrl_set(struct rte_eth_dev *dev __rte_unused, + struct rte_eth_fc_conf *fc_conf) +{ + if (fc_conf->mode != RTE_FC_NONE) + return -ENOTSUP; + return 0; +} + +static const struct eth_dev_ops ops = { + .dev_start = tap_dev_start, + .dev_stop = tap_dev_stop, + .dev_close = tap_dev_close, + .dev_configure = tap_dev_configure, + .dev_infos_get = tap_dev_info, + .rx_queue_setup = tap_rx_queue_setup, + .tx_queue_setup = tap_tx_queue_setup, + .rx_queue_release = tap_rx_queue_release, + .tx_queue_release = tap_tx_queue_release, + .flow_ctrl_get = tap_flow_ctrl_get, + .flow_ctrl_set = tap_flow_ctrl_set, + .link_update = tap_link_update, + .dev_set_link_up = tap_link_set_up, + .dev_set_link_down = tap_link_set_down, + .promiscuous_enable = tap_promisc_enable, + .promiscuous_disable = tap_promisc_disable, + .allmulticast_enable = tap_allmulti_enable, + .allmulticast_disable = tap_allmulti_disable, + .mac_addr_set = tap_mac_set, + .mtu_set = tap_mtu_set, + .set_mc_addr_list = tap_set_mc_addr_list, + .stats_get = tap_stats_get, + .stats_reset = tap_stats_reset, + .dev_supported_ptypes_get = tap_dev_supported_ptypes_get, + .filter_ctrl = tap_dev_filter_ctrl, +}; + +static int +tap_kernel_support(struct pmd_internals *pmd) +{ + struct utsname utsname; + int ver[3]; + + if (uname(&utsname) == -1 || + sscanf(utsname.release, "%d.%d.%d", + &ver[0], &ver[1], &ver[2]) != 3) + return 0; + if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >= FLOWER_KERNEL_VERSION) + pmd->flower_support = 1; + if (KERNEL_VERSION(ver[0], ver[1], ver[2]) >= + FLOWER_VLAN_KERNEL_VERSION) + pmd->flower_vlan_support = 1; + return 1; +} + +static int +eth_dev_tap_create(struct rte_vdev_device *vdev, char *tap_name, + char *remote_iface) +{ + int numa_node = rte_socket_id(); + struct rte_eth_dev *dev; + struct pmd_internals *pmd; + struct rte_eth_dev_data *data; + int i; + + RTE_LOG(DEBUG, PMD, " TAP device on numa %u\n", rte_socket_id()); + + data = rte_zmalloc_socket(tap_name, sizeof(*data), 0, numa_node); + if (!data) { + RTE_LOG(ERR, PMD, "TAP Failed to allocate data\n"); + goto error_exit; + } + + dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd)); + if (!dev) { + RTE_LOG(ERR, PMD, "TAP Unable to allocate device struct\n"); + goto error_exit; + } + + pmd = dev->data->dev_private; + snprintf(pmd->name, sizeof(pmd->name), "%s", tap_name); + pmd->nb_queues = RTE_PMD_TAP_MAX_QUEUES; + + pmd->ioctl_sock = socket(AF_INET, SOCK_DGRAM, 0); + if (pmd->ioctl_sock == -1) { + RTE_LOG(ERR, PMD, + "TAP Unable to get a socket for management: %s\n", + strerror(errno)); + goto error_exit; + } + + /* Setup some default values */ + rte_memcpy(data, dev->data, sizeof(*data)); + data->dev_private = pmd; + data->dev_flags = RTE_ETH_DEV_DETACHABLE | RTE_ETH_DEV_INTR_LSC; + data->numa_node = numa_node; + data->drv_name = pmd_tap_drv.driver.name; + + data->dev_link = pmd_link; + data->mac_addrs = &pmd->eth_addr; + data->nb_rx_queues = pmd->nb_queues; + data->nb_tx_queues = pmd->nb_queues; + + dev->data = data; + dev->dev_ops = &ops; + dev->rx_pkt_burst = pmd_rx_burst; + dev->tx_pkt_burst = pmd_tx_burst; + + pmd->intr_handle.type = RTE_INTR_HANDLE_EXT; + pmd->intr_handle.fd = -1; + + /* Presetup the fds to -1 as being not valid */ + for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) { + pmd->rxq[i].fd = -1; + pmd->txq[i].fd = -1; + } + + tap_kernel_support(pmd); + if (!pmd->flower_support) + return 0; + LIST_INIT(&pmd->flows); + /* + * If no netlink socket can be created, then it will fail when + * creating/destroying flow rules. + */ + pmd->nlsk_fd = nl_init(0); + if (strlen(remote_iface)) { + struct ifreq ifr; + + pmd->remote_if_index = if_nametoindex(remote_iface); + snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN, + "%s", remote_iface); + if (!pmd->remote_if_index) { + RTE_LOG(ERR, PMD, "Could not find %s ifindex: " + "remote interface will remain unconfigured\n", + remote_iface); + return 0; + } + if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) { + RTE_LOG(ERR, PMD, "Could not get remote MAC address\n"); + goto error_exit; + } + rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data, + ETHER_ADDR_LEN); + } else { + eth_random_addr((uint8_t *)&pmd->eth_addr); + } + + return 0; + +error_exit: + RTE_LOG(DEBUG, PMD, "TAP Unable to initialize %s\n", + rte_vdev_device_name(vdev)); + + rte_free(data); + return -EINVAL; +} + +static int +set_interface_name(const char *key __rte_unused, + const char *value, + void *extra_args) +{ + char *name = (char *)extra_args; + + if (value) + snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s", value); + else + snprintf(name, RTE_ETH_NAME_MAX_LEN - 1, "%s%d", + DEFAULT_TAP_NAME, (tap_unit - 1)); + + return 0; +} + +static int +set_interface_speed(const char *key __rte_unused, + const char *value, + void *extra_args) +{ + *(int *)extra_args = (value) ? atoi(value) : ETH_SPEED_NUM_10G; + + return 0; +} + +static int +set_remote_iface(const char *key __rte_unused, + const char *value, + void *extra_args) +{ + char *name = (char *)extra_args; + + if (value) + snprintf(name, RTE_ETH_NAME_MAX_LEN, "%s", value); + + return 0; +} + +/* Open a TAP interface device. + */ +static int +rte_pmd_tap_probe(struct rte_vdev_device *dev) +{ + const char *name, *params; + int ret; + struct rte_kvargs *kvlist = NULL; + int speed; + char tap_name[RTE_ETH_NAME_MAX_LEN]; + char remote_iface[RTE_ETH_NAME_MAX_LEN]; + + name = rte_vdev_device_name(dev); + params = rte_vdev_device_args(dev); + + speed = ETH_SPEED_NUM_10G; + snprintf(tap_name, sizeof(tap_name), "%s%d", + DEFAULT_TAP_NAME, tap_unit++); + memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN); + + if (params && (params[0] != '\0')) { + RTE_LOG(DEBUG, PMD, "paramaters (%s)\n", params); + + kvlist = rte_kvargs_parse(params, valid_arguments); + if (kvlist) { + if (rte_kvargs_count(kvlist, ETH_TAP_SPEED_ARG) == 1) { + ret = rte_kvargs_process(kvlist, + ETH_TAP_SPEED_ARG, + &set_interface_speed, + &speed); + if (ret == -1) + goto leave; + } + + if (rte_kvargs_count(kvlist, ETH_TAP_IFACE_ARG) == 1) { + ret = rte_kvargs_process(kvlist, + ETH_TAP_IFACE_ARG, + &set_interface_name, + tap_name); + if (ret == -1) + goto leave; + } + + if (rte_kvargs_count(kvlist, ETH_TAP_REMOTE_ARG) == 1) { + ret = rte_kvargs_process(kvlist, + ETH_TAP_REMOTE_ARG, + &set_remote_iface, + remote_iface); + if (ret == -1) + goto leave; + } + } + } + pmd_link.link_speed = speed; + + RTE_LOG(NOTICE, PMD, "Initializing pmd_tap for %s as %s\n", + name, tap_name); + + ret = eth_dev_tap_create(dev, tap_name, remote_iface); + +leave: + if (ret == -1) { + RTE_LOG(ERR, PMD, "Failed to create pmd for %s as %s\n", + name, tap_name); + tap_unit--; /* Restore the unit number */ + } + rte_kvargs_free(kvlist); + + return ret; +} + +/* detach a TAP device. + */ +static int +rte_pmd_tap_remove(struct rte_vdev_device *dev) +{ + struct rte_eth_dev *eth_dev = NULL; + struct pmd_internals *internals; + int i; + + RTE_LOG(DEBUG, PMD, "Closing TUN/TAP Ethernet device on numa %u\n", + rte_socket_id()); + + /* find the ethdev entry */ + eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev)); + if (!eth_dev) + return 0; + + internals = eth_dev->data->dev_private; + if (internals->flower_support && internals->nlsk_fd) { + tap_flow_flush(eth_dev, NULL); + tap_flow_implicit_flush(internals, NULL); + nl_final(internals->nlsk_fd); + } + for (i = 0; i < internals->nb_queues; i++) + if (internals->rxq[i].fd != -1) + close(internals->rxq[i].fd); + + close(internals->ioctl_sock); + rte_free(eth_dev->data->dev_private); + rte_free(eth_dev->data); + + rte_eth_dev_release_port(eth_dev); + + return 0; +} + +static struct rte_vdev_driver pmd_tap_drv = { + .probe = rte_pmd_tap_probe, + .remove = rte_pmd_tap_remove, +}; +RTE_PMD_REGISTER_VDEV(net_tap, pmd_tap_drv); +RTE_PMD_REGISTER_ALIAS(net_tap, eth_tap); +RTE_PMD_REGISTER_PARAM_STRING(net_tap, + ETH_TAP_IFACE_ARG "=<string> " + ETH_TAP_SPEED_ARG "=<int> " + ETH_TAP_REMOTE_ARG "=<string>"); |