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numam-dpdk/drivers/net/tap/rte_eth_tap.c
Pascal Mazon 8ae3023387 net/tap: add Rx/Tx checksum offload support 
This patch adds basic offloading support, widely expected in a PMD.

Verify IPv4 and UDP/TCP checksums upon packet reception, and set
ol_flags accordingly.

On Tx, set IPv4 and UDP/TCP checksums when required, considering
ol_flags.

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
2017-06-12 10:41:26 +01:00

1565 lines
40 KiB
C
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/*-
* BSD LICENSE
*
* Copyright(c) 2016-2017 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_byteorder.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 <rte_debug.h>
#include <rte_ip.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 ETH_TAP_MAC_ARG "mac"
#define ETH_TAP_MAC_FIXED "fixed"
#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,
ETH_TAP_MAC_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_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)
{
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));
}
return fd;
error:
if (fd > 0)
close(fd);
return -1;
}
static void
tap_verify_csum(struct rte_mbuf *mbuf)
{
uint32_t l2 = mbuf->packet_type & RTE_PTYPE_L2_MASK;
uint32_t l3 = mbuf->packet_type & RTE_PTYPE_L3_MASK;
uint32_t l4 = mbuf->packet_type & RTE_PTYPE_L4_MASK;
unsigned int l2_len = sizeof(struct ether_hdr);
unsigned int l3_len;
uint16_t cksum = 0;
void *l3_hdr;
void *l4_hdr;
if (l2 == RTE_PTYPE_L2_ETHER_VLAN)
l2_len += 4;
else if (l2 == RTE_PTYPE_L2_ETHER_QINQ)
l2_len += 8;
/* Don't verify checksum for packets with discontinuous L2 header */
if (unlikely(l2_len + sizeof(struct ipv4_hdr) >
rte_pktmbuf_data_len(mbuf)))
return;
l3_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len);
if (l3 == RTE_PTYPE_L3_IPV4 || l3 == RTE_PTYPE_L3_IPV4_EXT) {
struct ipv4_hdr *iph = l3_hdr;
/* ihl contains the number of 4-byte words in the header */
l3_len = 4 * (iph->version_ihl & 0xf);
if (unlikely(l2_len + l3_len > rte_pktmbuf_data_len(mbuf)))
return;
cksum = ~rte_raw_cksum(iph, l3_len);
mbuf->ol_flags |= cksum ?
PKT_RX_IP_CKSUM_BAD :
PKT_RX_IP_CKSUM_GOOD;
} else if (l3 == RTE_PTYPE_L3_IPV6) {
l3_len = sizeof(struct ipv6_hdr);
} else {
/* IPv6 extensions are not supported */
return;
}
if (l4 == RTE_PTYPE_L4_UDP || l4 == RTE_PTYPE_L4_TCP) {
l4_hdr = rte_pktmbuf_mtod_offset(mbuf, void *, l2_len + l3_len);
/* Don't verify checksum for multi-segment packets. */
if (mbuf->nb_segs > 1)
return;
if (l3 == RTE_PTYPE_L3_IPV4)
cksum = ~rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
else if (l3 == RTE_PTYPE_L3_IPV6)
cksum = ~rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
mbuf->ol_flags |= cksum ?
PKT_RX_L4_CKSUM_BAD :
PKT_RX_L4_CKSUM_GOOD;
}
}
/* 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);
if (rxq->rxmode->hw_ip_checksum)
tap_verify_csum(mbuf);
/* 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;
}
static void
tap_tx_offload(char *packet, uint64_t ol_flags, unsigned int l2_len,
unsigned int l3_len)
{
void *l3_hdr = packet + l2_len;
if (ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4)) {
struct ipv4_hdr *iph = l3_hdr;
uint16_t cksum;
iph->hdr_checksum = 0;
cksum = rte_raw_cksum(iph, l3_len);
iph->hdr_checksum = (cksum == 0xffff) ? cksum : ~cksum;
}
if (ol_flags & PKT_TX_L4_MASK) {
uint16_t l4_len;
uint32_t cksum;
uint16_t *l4_cksum;
void *l4_hdr;
l4_hdr = packet + l2_len + l3_len;
if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM)
l4_cksum = &((struct udp_hdr *)l4_hdr)->dgram_cksum;
else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM)
l4_cksum = &((struct tcp_hdr *)l4_hdr)->cksum;
else
return;
*l4_cksum = 0;
if (ol_flags & PKT_TX_IPV4) {
struct ipv4_hdr *iph = l3_hdr;
l4_len = rte_be_to_cpu_16(iph->total_length) - l3_len;
cksum = rte_ipv4_phdr_cksum(l3_hdr, 0);
} else {
struct ipv6_hdr *ip6h = l3_hdr;
/* payload_len does not include ext headers */
l4_len = rte_be_to_cpu_16(ip6h->payload_len) -
l3_len + sizeof(struct ipv6_hdr);
cksum = rte_ipv6_phdr_cksum(l3_hdr, 0);
}
cksum += rte_raw_cksum(l4_hdr, l4_len);
cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
cksum = (~cksum) & 0xffff;
if (cksum == 0)
cksum = 0xffff;
*l4_cksum = cksum;
}
}
/* 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;
char m_copy[mbuf->data_len];
int n;
int j;
/* stats.errs will be incremented */
if (rte_pktmbuf_pkt_len(mbuf) > max_size)
break;
iovecs[0].iov_base = &pi;
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;
}
if (mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
(mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
(mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) {
/* Support only packets with all data in the same seg */
if (mbuf->nb_segs > 1)
break;
/* To change checksums, work on a copy of data. */
rte_memcpy(m_copy, rte_pktmbuf_mtod(mbuf, void *),
rte_pktmbuf_data_len(mbuf));
tap_tx_offload(m_copy, mbuf->ol_flags,
mbuf->l2_len, mbuf->l3_len);
iovecs[1].iov_base = m_copy;
}
/* 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 const char *
tap_ioctl_req2str(unsigned long request)
{
switch (request) {
case SIOCSIFFLAGS:
return "SIOCSIFFLAGS";
case SIOCGIFFLAGS:
return "SIOCGIFFLAGS";
case SIOCGIFHWADDR:
return "SIOCGIFHWADDR";
case SIOCSIFHWADDR:
return "SIOCSIFHWADDR";
case SIOCSIFMTU:
return "SIOCSIFMTU";
}
return "UNKNOWN";
}
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_ASSERT(!"unsupported request type: must not happen");
}
if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
goto error;
if (remote-- && mode == LOCAL_AND_REMOTE)
goto apply;
return 0;
error:
RTE_LOG(DEBUG, PMD, "%s: %s(%s) failed: %s(%d)\n", ifr->ifr_name,
__func__, tap_ioctl_req2str(request), strerror(errno), 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();
dev_info->rx_offload_capa = (DEV_RX_OFFLOAD_IPV4_CKSUM |
DEV_RX_OFFLOAD_UDP_CKSUM |
DEV_RX_OFFLOAD_TCP_CKSUM);
dev_info->tx_offload_capa =
(DEV_TX_OFFLOAD_IPV4_CKSUM |
DEV_TX_OFFLOAD_UDP_CKSUM |
DEV_TX_OFFLOAD_TCP_CKSUM);
}
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)
{
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;
enum ioctl_mode mode = LOCAL_ONLY;
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)
return;
if (is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
mac_addr))
return;
/* Check the current MAC address on the remote */
if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0)
return;
if (!is_same_ether_addr((struct ether_addr *)&ifr.ifr_hwaddr.sa_data,
mac_addr))
mode = LOCAL_AND_REMOTE;
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, mode) < 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 = rx->fd == -1 ? tx->fd : rx->fd;
if (fd == -1) {
RTE_LOG(INFO, PMD, "Add queue to TAP %s for qid %d\n",
pmd->name, qid);
fd = tun_alloc(pmd);
if (fd < 0) {
RTE_LOG(ERR, PMD, "%s: tun_alloc() failed.\n",
pmd->name);
return -1;
}
}
rx->fd = fd;
tx->fd = fd;
tx->mtu = &dev->data->mtu;
rx->rxmode = &dev->data->dev_conf.rxmode;
return fd;
}
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;
dev->data->rx_queues[rx_queue_id] = rxq;
fd = tap_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;
dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
ret = tap_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 fixed_mac_type)
{
int numa_node = rte_socket_id();
struct rte_eth_dev *dev;
struct pmd_internals *pmd;
struct rte_eth_dev_data *data;
struct ifreq ifr;
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;
}
if (fixed_mac_type) {
/* fixed mac = 00:64:74:61:70:<iface_idx> */
static int iface_idx;
char mac[ETHER_ADDR_LEN] = "\0dtap";
mac[ETHER_ADDR_LEN - 1] = iface_idx++;
rte_memcpy(&pmd->eth_addr, mac, ETHER_ADDR_LEN);
} else {
eth_random_addr((uint8_t *)&pmd->eth_addr);
}
/* Immediately create the netdevice (this will create the 1st queue). */
if (tap_setup_queue(dev, pmd, 0) == -1)
goto error_exit;
ifr.ifr_mtu = dev->data->mtu;
if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1, LOCAL_AND_REMOTE) < 0)
goto error_exit;
memset(&ifr, 0, sizeof(struct ifreq));
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_exit;
tap_kernel_support(pmd);
if (!pmd->flower_support) {
if (remote_iface[0]) {
RTE_LOG(ERR, PMD,
"%s: kernel does not support TC rules, required for remote feature.",
pmd->name);
goto error_exit;
} else {
RTE_LOG(INFO, PMD,
"%s: kernel too old for Flow API support.\n",
pmd->name);
return 0;
}
}
/*
* Set up everything related to rte_flow:
* - netlink socket
* - tap / remote if_index
* - mandatory QDISCs
* - rte_flow actual/implicit lists
* - implicit rules
*/
pmd->nlsk_fd = nl_init(0);
if (pmd->nlsk_fd == -1) {
RTE_LOG(WARNING, PMD, "%s: failed to create netlink socket.",
pmd->name);
goto disable_rte_flow;
}
pmd->if_index = if_nametoindex(pmd->name);
if (!pmd->if_index) {
RTE_LOG(ERR, PMD, "%s: failed to get if_index.", pmd->name);
goto disable_rte_flow;
}
if (qdisc_create_multiq(pmd->nlsk_fd, pmd->if_index) < 0) {
RTE_LOG(ERR, PMD, "%s: failed to create multiq qdisc.",
pmd->name);
goto disable_rte_flow;
}
if (qdisc_create_ingress(pmd->nlsk_fd, pmd->if_index) < 0) {
RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.",
pmd->name);
goto disable_rte_flow;
}
LIST_INIT(&pmd->flows);
if (strlen(remote_iface)) {
pmd->remote_if_index = if_nametoindex(remote_iface);
if (!pmd->remote_if_index) {
RTE_LOG(ERR, PMD, "%s: failed to get %s if_index.",
pmd->name, remote_iface);
goto error_remote;
}
snprintf(pmd->remote_iface, RTE_ETH_NAME_MAX_LEN,
"%s", remote_iface);
if (tap_ioctl(pmd, SIOCGIFHWADDR, &ifr, 0, REMOTE_ONLY) < 0) {
RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.",
pmd->name, pmd->remote_iface);
goto error_remote;
}
rte_memcpy(&pmd->eth_addr, ifr.ifr_hwaddr.sa_data,
ETHER_ADDR_LEN);
/* The desired MAC is already in ifreq after SIOCGIFHWADDR. */
if (tap_ioctl(pmd, SIOCSIFHWADDR, &ifr, 0, LOCAL_ONLY) < 0) {
RTE_LOG(ERR, PMD, "%s: failed to get %s MAC address.",
pmd->name, remote_iface);
goto error_remote;
}
/*
* 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) {
RTE_LOG(ERR, PMD, "%s: failed to create ingress qdisc.",
pmd->remote_iface);
goto error_remote;
}
LIST_INIT(&pmd->implicit_flows);
if (tap_flow_implicit_create(pmd, TAP_REMOTE_TX) < 0 ||
tap_flow_implicit_create(pmd, TAP_REMOTE_LOCAL_MAC) < 0 ||
tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCAST) < 0 ||
tap_flow_implicit_create(pmd, TAP_REMOTE_BROADCASTV6) < 0) {
RTE_LOG(ERR, PMD,
"%s: failed to create implicit rules.",
pmd->name);
goto error_remote;
}
}
return 0;
disable_rte_flow:
RTE_LOG(ERR, PMD, " Disabling rte flow support: %s(%d)\n",
strerror(errno), errno);
if (strlen(remote_iface)) {
RTE_LOG(ERR, PMD, "Remote feature requires flow support.\n");
goto error_exit;
}
pmd->flower_support = 0;
return 0;
error_remote:
RTE_LOG(ERR, PMD, " Can't set up remote feature: %s(%d)\n",
strerror(errno), errno);
tap_flow_implicit_flush(pmd, NULL);
error_exit:
RTE_LOG(ERR, 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;
}
static int
set_mac_type(const char *key __rte_unused,
const char *value,
void *extra_args)
{
if (value &&
!strncasecmp(ETH_TAP_MAC_FIXED, value, strlen(ETH_TAP_MAC_FIXED)))
*(int *)extra_args = 1;
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];
int fixed_mac_type = 0;
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;
}
if (rte_kvargs_count(kvlist, ETH_TAP_MAC_ARG) == 1) {
ret = rte_kvargs_process(kvlist,
ETH_TAP_MAC_ARG,
&set_mac_type,
&fixed_mac_type);
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, fixed_mac_type);
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_MAC_ARG "=" ETH_TAP_MAC_FIXED " "
ETH_TAP_REMOTE_ARG "=<string>");
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