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vr_dpdk_interface.c
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vr_dpdk_interface.c
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/*
* Copyright (C) 2014 Semihalf.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* vr_dpdk_interface.c -- vRouter interface callbacks
*
*/
#include "vr_dpdk.h"
#include "vr_dpdk_netlink.h"
#include "vr_dpdk_usocket.h"
#include "vr_dpdk_virtio.h"
#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_ip_frag.h>
#include <rte_ip.h>
#include <rte_port_ethdev.h>
/*
* dpdk_virtual_if_add - add a virtual (virtio) interface to vrouter.
* Returns 0 on success, < 0 otherwise.
*/
static int
dpdk_virtual_if_add(struct vr_interface *vif)
{
int ret;
uint16_t nrxqs, ntxqs;
RTE_LOG(INFO, VROUTER, "Adding vif %u virtual device %s\n",
vif->vif_idx, vif->vif_name);
nrxqs = vr_dpdk_virtio_nrxqs(vif);
/* virtio TX is thread safe, so we assign TX queue to each lcore */
ntxqs = (uint16_t)-1;
ret = vr_dpdk_lcore_if_schedule(vif, vr_dpdk_lcore_least_used_get(),
nrxqs, &vr_dpdk_virtio_rx_queue_init,
ntxqs, &vr_dpdk_virtio_tx_queue_init);
if (ret) {
return ret;
}
/*
* When something goes wrong, vr_netlink_uvhost_vif_add() returns
* non-zero value. Then we return this value here. It is handled by
* dp-core and dpdk_virtual_if_del() is called, so there is no need
* to do it manually here.
*
* Check dp-core/vf_interface.c:eth_drv_add() for reference.
*/
return vr_netlink_uvhost_vif_add(vif->vif_name, vif->vif_idx,
nrxqs, ntxqs);
}
/*
* dpdk_virtual_if_del - deletes a virtual (virtio) interface from vrouter.
* Returns 0 on success, -1 otherwise.
*/
static int
dpdk_virtual_if_del(struct vr_interface *vif)
{
int ret;
RTE_LOG(INFO, VROUTER, "Deleting vif %u virtual device\n",
vif->vif_idx);
ret = vr_netlink_uvhost_vif_del(vif->vif_idx);
vr_dpdk_lcore_if_unschedule(vif);
/*
* TODO - User space vhost thread need to ack the deletion of the vif.
*/
return ret;
}
static inline void
dpdk_dbdf_to_pci(unsigned int dbdf,
struct rte_pci_addr *address)
{
address->domain = (dbdf >> 16);
address->bus = (dbdf >> 8) & 0xff;
address->devid = (dbdf & 0xf8);
address->function = (dbdf & 0x7);
return;
}
static inline unsigned
dpdk_pci_to_dbdf(struct rte_pci_addr *address)
{
return address->domain << 16
| address->bus << 8
| address->devid
| address->function;
}
/* mirrors the function used in bonding */
static inline uint8_t
dpdk_find_port_id_by_pci_addr(const struct rte_pci_addr *addr)
{
uint8_t i;
struct rte_pci_addr *eth_pci_addr;
for (i = 0; i < rte_eth_dev_count(); i++) {
if (rte_eth_devices[i].pci_dev == NULL)
continue;
eth_pci_addr = &(rte_eth_devices[i].pci_dev->addr);
if (addr->bus == eth_pci_addr->bus &&
addr->devid == eth_pci_addr->devid &&
addr->domain == eth_pci_addr->domain &&
addr->function == eth_pci_addr->function) {
return i;
}
}
return VR_DPDK_INVALID_PORT_ID;
}
static inline void
dpdk_find_pci_addr_by_port(struct rte_pci_addr *addr, uint8_t port_id)
{
rte_memcpy(addr, &rte_eth_devices[port_id].pci_dev->addr, sizeof(struct rte_pci_addr));
}
int
dpdk_vif_attach_ethdev(struct vr_interface *vif,
struct vr_dpdk_ethdev *ethdev)
{
int ret = 0;
struct ether_addr mac_addr;
struct rte_eth_dev_info dev_info;
vif->vif_os = (void *)ethdev;
rte_eth_dev_info_get(ethdev->ethdev_port_id, &dev_info);
if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_IPV4_CKSUM
&& dev_info.tx_offload_capa & DEV_TX_OFFLOAD_UDP_CKSUM
&& dev_info.tx_offload_capa & DEV_TX_OFFLOAD_TCP_CKSUM) {
vif->vif_flags |= VIF_FLAG_TX_CSUM_OFFLOAD;
} else {
vif->vif_flags &= ~VIF_FLAG_TX_CSUM_OFFLOAD;
}
if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_VLAN_INSERT
&& dev_info.rx_offload_capa & DEV_RX_OFFLOAD_VLAN_STRIP) {
vif->vif_flags |= VIF_FLAG_VLAN_OFFLOAD;
} else {
vif->vif_flags &= ~VIF_FLAG_VLAN_OFFLOAD;
}
memset(&mac_addr, 0, sizeof(mac_addr));
/*
* do not want to overwrite what agent had sent. set only if
* the address has null
*/
if (!memcmp(vif->vif_mac, mac_addr.addr_bytes, ETHER_ADDR_LEN)) {
rte_eth_macaddr_get(ethdev->ethdev_port_id, &mac_addr);
memcpy(vif->vif_mac, mac_addr.addr_bytes, ETHER_ADDR_LEN);
}
return ret;
}
/* Add VLAN forwarding interface */
int
dpdk_vlan_forwarding_if_add(void)
{
int ret;
struct vr_interface vlan_fwd_intf;
strncpy((char *)vlan_fwd_intf.vif_name, vr_dpdk.vlan_name,
sizeof(vlan_fwd_intf.vif_name));
vlan_fwd_intf.vif_type = VIF_TYPE_VLAN;
RTE_LOG(INFO, VROUTER, "Adding VLAN forwarding device %s\n",
vr_dpdk.vlan_name);
ret = vr_dpdk_knidev_init(0, &vlan_fwd_intf);
if (ret != 0) {
RTE_LOG(ERR, VROUTER, "Error creating KNI for VLAN forwarding intf\n");
return ret;
}
/* Save KNI handler needed to send packets to the interface. */
vr_dpdk.vlan_kni = (struct rte_kni *)vlan_fwd_intf.vif_os;
/*
* Allocate a multi-producer single-consumer ring - a buffer for packets
* waiting to be send to the forwarding interface.
*/
vr_dpdk.vlan_ring = vr_dpdk_ring_allocate(VR_DPDK_FWD_LCORE_ID,
vr_dpdk.vlan_name, VR_DPDK_TX_RING_SZ, RING_F_SC_DEQ);
if (!vr_dpdk.vlan_ring) {
RTE_LOG(ERR, VROUTER, "Error creating a ring for VLAN forwarding intf\n");
return -1;
}
return 0;
}
/* Add fabric interface */
static int
dpdk_fabric_if_add(struct vr_interface *vif)
{
int ret;
uint8_t port_id;
struct rte_pci_addr pci_address;
struct vr_dpdk_ethdev *ethdev;
struct ether_addr mac_addr;
memset(&pci_address, 0, sizeof(pci_address));
if (vif->vif_flags & VIF_FLAG_PMD) {
if (vif->vif_os_idx >= rte_eth_dev_count()) {
RTE_LOG(ERR, VROUTER, "Invalid PMD device index %u"
" (must be less than %u)\n",
vif->vif_os_idx, (unsigned)rte_eth_dev_count());
return -ENOENT;
}
port_id = vif->vif_os_idx;
/* TODO: does not work for host interfaces
dpdk_find_pci_addr_by_port(&pci_address, port_id);
vif->vif_os_idx = dpdk_pci_to_dbdf(&pci_address);
*/
} else {
dpdk_dbdf_to_pci(vif->vif_os_idx, &pci_address);
port_id = dpdk_find_port_id_by_pci_addr(&pci_address);
if (port_id == VR_DPDK_INVALID_PORT_ID) {
RTE_LOG(ERR, VROUTER, "Error adding vif %u eth device %s:"
" no port ID found for PCI " PCI_PRI_FMT "\n",
vif->vif_idx, vif->vif_name,
pci_address.domain, pci_address.bus,
pci_address.devid, pci_address.function);
return -ENOENT;
}
}
memset(&mac_addr, 0, sizeof(mac_addr));
rte_eth_macaddr_get(port_id, &mac_addr);
RTE_LOG(INFO, VROUTER, "Adding vif %u eth device %" PRIu8 " PCI " PCI_PRI_FMT
" MAC " MAC_FORMAT "\n",
vif->vif_idx, port_id, pci_address.domain, pci_address.bus,
pci_address.devid, pci_address.function,
MAC_VALUE(mac_addr.addr_bytes));
ethdev = &vr_dpdk.ethdevs[port_id];
if (ethdev->ethdev_ptr != NULL) {
RTE_LOG(ERR, VROUTER, " error adding eth dev %s: already added\n",
vif->vif_name);
return -EEXIST;
}
ethdev->ethdev_port_id = port_id;
/* init eth device */
ret = vr_dpdk_ethdev_init(ethdev);
if (ret != 0)
return ret;
ret = dpdk_vif_attach_ethdev(vif, ethdev);
if (ret)
return ret;
ret = rte_eth_dev_start(port_id);
if (ret < 0) {
RTE_LOG(ERR, VROUTER, " error starting eth device %" PRIu8
": %s (%d)\n", port_id, rte_strerror(-ret), -ret);
return ret;
}
ret = vr_dpdk_ethdev_rss_init(ethdev);
if (ret < 0)
return ret;
/* we need to init Flow Director after the device has started */
#if VR_DPDK_USE_HW_FILTERING
/* init hardware filtering */
ret = vr_dpdk_ethdev_filtering_init(vif, ethdev);
if (ret < 0)
return ret;
#endif
/* schedule RX/TX queues */
return vr_dpdk_lcore_if_schedule(vif, vr_dpdk_lcore_least_used_get(),
ethdev->ethdev_nb_rss_queues, &vr_dpdk_ethdev_rx_queue_init,
ethdev->ethdev_nb_tx_queues, &vr_dpdk_ethdev_tx_queue_init);
}
/* Delete fabric interface */
static int
dpdk_fabric_if_del(struct vr_interface *vif)
{
uint8_t port_id;
RTE_LOG(INFO, VROUTER, "Deleting vif %u\n", vif->vif_idx);
/*
* If dpdk_fabric_if_add() failed before dpdk_vif_attach_ethdev,
* then vif->vif_os will be NULL.
*/
if (vif->vif_os == NULL) {
RTE_LOG(ERR, VROUTER, " error deleting eth dev %s: already removed\n",
vif->vif_name);
return -EEXIST;
}
port_id = (((struct vr_dpdk_ethdev *)(vif->vif_os))->ethdev_port_id);
/* unschedule RX/TX queues */
vr_dpdk_lcore_if_unschedule(vif);
rte_eth_dev_stop(port_id);
/* release eth device */
return vr_dpdk_ethdev_release(vif->vif_os);
}
/* Add vhost interface */
static int
dpdk_vhost_if_add(struct vr_interface *vif)
{
uint8_t port_id, slave_port_id = VR_DPDK_INVALID_PORT_ID;
int ret;
struct ether_addr mac_addr;
struct vr_dpdk_ethdev *ethdev;
if (vif->vif_flags & VIF_FLAG_PMD) {
port_id = vif->vif_os_idx;
}
else {
/* The Agent passes xconnect fabric interface in cross_connect_idx,
* but dp-core does not copy it into vr_interface. Instead
* it looks for an interface with os_idx == cross_connect_idx
* and sets vif->vif_bridge if there is such an interface.
*/
ethdev = (struct vr_dpdk_ethdev *)(vif->vif_bridge->vif_os);
if (ethdev == NULL) {
RTE_LOG(ERR, VROUTER, "Error adding vif %u KNI device %s:"
" bridge vif %u ethdev is not initialized\n",
vif->vif_idx, vif->vif_name, vif->vif_bridge->vif_idx);
return -ENOENT;
}
port_id = ethdev->ethdev_port_id;
/*
* KNI does not support bond interfaces and generate random MACs,
* so we try to get a bond member instead.
*/
if (ethdev->ethdev_nb_slaves > 0)
slave_port_id = ethdev->ethdev_slaves[0];
}
/* get interface MAC address */
memset(&mac_addr, 0, sizeof(mac_addr));
rte_eth_macaddr_get(port_id, &mac_addr);
RTE_LOG(INFO, VROUTER, "Adding vif %u KNI device %s at eth device %" PRIu8
" MAC " MAC_FORMAT "\n",
vif->vif_idx, vif->vif_name, port_id, MAC_VALUE(mac_addr.addr_bytes));
if (slave_port_id != VR_DPDK_INVALID_PORT_ID) {
port_id = slave_port_id;
memset(&mac_addr, 0, sizeof(mac_addr));
rte_eth_macaddr_get(port_id, &mac_addr);
RTE_LOG(INFO, VROUTER, " using bond slave eth device %" PRIu8
" MAC " MAC_FORMAT "\n",
port_id, MAC_VALUE(mac_addr.addr_bytes));
}
/* init KNI */
ret = vr_dpdk_knidev_init(port_id, vif);
if (ret != 0)
return ret;
return vr_dpdk_lcore_if_schedule(vif, vr_dpdk_lcore_least_used_get(),
1, &vr_dpdk_kni_rx_queue_init,
1, &vr_dpdk_kni_tx_queue_init);
}
/* Delete vhost interface */
static int
dpdk_vhost_if_del(struct vr_interface *vif)
{
RTE_LOG(INFO, VROUTER, "Deleting vif %u KNI device %s\n",
vif->vif_idx, vif->vif_name);
vr_dpdk_lcore_if_unschedule(vif);
/* release KNI */
return vr_dpdk_knidev_release(vif);
}
/* Start interface monitoring */
static void
dpdk_monitoring_start(struct vr_interface *monitored_vif,
struct vr_interface *monitoring_vif)
{
uint8_t port_id;
/* set monitoring redirection */
vr_dpdk.monitorings[monitored_vif->vif_idx] = monitoring_vif->vif_idx;
/* set vif flag */
rte_wmb();
monitored_vif->vif_flags |= VIF_FLAG_MONITORED;
if(vif_is_fabric(monitored_vif)) {
port_id = (((struct vr_dpdk_ethdev *)(monitored_vif->vif_os))->ethdev_port_id);
rte_eth_promiscuous_enable(port_id);
}
}
/* Stop interface monitoring */
static void
dpdk_monitoring_stop(struct vr_interface *monitored_vif,
struct vr_interface *monitoring_vif)
{
uint8_t port_id;
/* check if the monitored vif was reused */
if (vr_dpdk.monitorings[monitored_vif->vif_idx] != monitoring_vif->vif_idx)
return;
/* clear vif flag */
monitored_vif->vif_flags &= ~((unsigned int)VIF_FLAG_MONITORED);
rte_wmb();
/* clear monitoring redirection */
vr_dpdk.monitorings[monitored_vif->vif_idx] = VR_MAX_INTERFACES;
if(vif_is_fabric(monitored_vif)) {
port_id = (((struct vr_dpdk_ethdev *)(monitored_vif->vif_os))->ethdev_port_id);
rte_eth_promiscuous_disable(port_id);
}
}
/* Add monitoring interface */
static int
dpdk_monitoring_if_add(struct vr_interface *vif)
{
int ret;
unsigned short monitored_vif_id = vif->vif_os_idx;
struct vr_interface *monitored_vif;
struct vrouter *router = vrouter_get(vif->vif_rid);
RTE_LOG(INFO, VROUTER, "Adding monitoring vif %u KNI device %s"
" to monitor vif %u\n",
vif->vif_idx, vif->vif_name, monitored_vif_id);
/* Check if vif exist.
* We don't need vif reference in order to monitor it.
* We use the VIF_FLAG_MONITORED to copy in/out packet to the
* monitoring interface. If the monitored vif get deleted, we simply
* get no more packets.
*/
monitored_vif = __vrouter_get_interface(router, monitored_vif_id);
if (!monitored_vif) {
RTE_LOG(ERR, VROUTER, " error getting vif to monitor:"
" vif %u does not exist\n", monitored_vif_id);
return -EINVAL;
}
/*
* TODO: we always use DPDK port 0 for monitoring KNI
* DPDK numerates all the detected Ethernet devices starting from 0.
* So we might only get into an issue if we have no eth devices at all
* or we have few eth ports and don't want to use the first one.
*/
ret = vr_dpdk_knidev_init(0, vif);
if (ret != 0)
return ret;
/* write-only interface */
ret = vr_dpdk_lcore_if_schedule(vif, vr_dpdk_lcore_least_used_get(),
0, NULL,
1, &vr_dpdk_kni_tx_queue_init);
if (ret != 0)
return ret;
/* start monitoring */
dpdk_monitoring_start(monitored_vif, vif);
return 0;
}
/* Delete monitoring interface */
static int
dpdk_monitoring_if_del(struct vr_interface *vif)
{
unsigned short monitored_vif_id = vif->vif_os_idx;
struct vr_interface *monitored_vif;
RTE_LOG(INFO, VROUTER, "Deleting monitoring vif %u KNI device"
" to monitor vif %u\n",
vif->vif_idx, monitored_vif_id);
/* check if vif exist */
monitored_vif = __vrouter_get_interface(vrouter_get(vif->vif_rid),
monitored_vif_id);
if (!monitored_vif) {
RTE_LOG(ERR, VROUTER, " error getting vif to monitor:"
" vif %u does not exist\n", monitored_vif_id);
} else {
/* stop monitoring */
dpdk_monitoring_stop(monitored_vif, vif);
}
vr_dpdk_lcore_if_unschedule(vif);
/* release KNI */
return vr_dpdk_knidev_release(vif);
}
/* Add agent interface */
static int
dpdk_agent_if_add(struct vr_interface *vif)
{
int ret;
RTE_LOG(INFO, VROUTER, "Adding vif %u packet device %s\n",
vif->vif_idx, vif->vif_name);
/* check if packet device is already added */
if (vr_dpdk.packet_ring != NULL) {
RTE_LOG(ERR, VROUTER, " error adding packet device %s: already exist\n",
vif->vif_name);
return -EEXIST;
}
/* init packet device */
ret = dpdk_packet_socket_init();
if (ret < 0) {
RTE_LOG(ERR, VROUTER, " error initializing packet socket: %s (%d)\n",
rte_strerror(errno), errno);
return ret;
}
vr_usocket_attach_vif(vr_dpdk.packet_transport, vif);
/* No need to schedule the pkt0 at the moment, since we RX from the
* socket and TX to the global packet_ring.
*/
return 0;
}
/* Delete agent interface */
static int
dpdk_agent_if_del(struct vr_interface *vif)
{
RTE_LOG(INFO, VROUTER, "Deleting vif %u packet device\n",
vif->vif_idx);
dpdk_packet_socket_close();
return 0;
}
extern void vhost_remove_xconnect(void);
/* vRouter callback */
static int
dpdk_if_add(struct vr_interface *vif)
{
if (vr_dpdk_is_stop_flag_set())
return -EINPROGRESS;
if (vif_is_fabric(vif)) {
return dpdk_fabric_if_add(vif);
} else if (vif_is_virtual(vif)) {
return dpdk_virtual_if_add(vif);
} else if (vif_is_vhost(vif)) {
return dpdk_vhost_if_add(vif);
} else if (vif->vif_type == VIF_TYPE_AGENT) {
if (vif->vif_transport == VIF_TRANSPORT_SOCKET)
return dpdk_agent_if_add(vif);
RTE_LOG(ERR, VROUTER, "Error adding vif %d packet device %s: "
"unsupported transport %d\n",
vif->vif_idx, vif->vif_name, vif->vif_transport);
return -EFAULT;
} else if (vif->vif_type == VIF_TYPE_MONITORING) {
return dpdk_monitoring_if_add(vif);
}
RTE_LOG(ERR, VROUTER, "Error adding vif %d (%s): unsupported interface type %d\n",
vif->vif_idx, vif->vif_name, vif->vif_type);
return -EFAULT;
}
static int
dpdk_if_del(struct vr_interface *vif)
{
if (vr_dpdk_is_stop_flag_set())
return -EINPROGRESS;
if (vif_is_fabric(vif)) {
return dpdk_fabric_if_del(vif);
} else if (vif_is_virtual(vif)) {
return dpdk_virtual_if_del(vif);
} else if (vif_is_vhost(vif)) {
return dpdk_vhost_if_del(vif);
} else if (vif->vif_type == VIF_TYPE_AGENT) {
if (vif->vif_transport == VIF_TRANSPORT_SOCKET)
return dpdk_agent_if_del(vif);
} else if (vif->vif_type == VIF_TYPE_MONITORING) {
return dpdk_monitoring_if_del(vif);
}
RTE_LOG(ERR, VROUTER, "Unsupported interface type %d index %d\n",
vif->vif_type, vif->vif_idx);
return -EFAULT;
}
/* vRouter callback */
static int
dpdk_if_del_tap(struct vr_interface *vif)
{
/* TODO: we untap interfaces at if_del */
return 0;
}
/* vRouter callback */
static int
dpdk_if_add_tap(struct vr_interface *vif)
{
/* TODO: we tap interfaces at if_add */
return 0;
}
static inline void
dpdk_hw_checksum_at_offset(struct vr_packet *pkt, unsigned offset)
{
struct rte_mbuf *m = vr_dpdk_pkt_to_mbuf(pkt);
struct vr_ip *iph = NULL;
struct vr_ip6 *ip6h = NULL;
unsigned char iph_len = 0, iph_proto = 0;
struct vr_tcp *tcph;
struct vr_udp *udph;
RTE_VERIFY(0 < offset);
if (pkt->vp_type == VP_TYPE_IP || pkt->vp_type == VP_TYPE_IPOIP) {
iph = (struct vr_ip *)pkt_data_at_offset(pkt, offset);
iph_len = iph->ip_hl * 4;
iph_proto = iph->ip_proto;
m->ol_flags |= PKT_TX_IP_CKSUM | PKT_TX_IPV4;
iph->ip_csum = 0;
} else if (pkt->vp_type == VP_TYPE_IP6 || pkt->vp_type == VP_TYPE_IP6OIP) {
ip6h = (struct vr_ip6 *)pkt_data_at_offset(pkt, offset);
iph_len = sizeof(struct vr_ip6);
iph_proto = ip6h->ip6_nxt;
m->ol_flags |= PKT_TX_IPV6;
} else {
/* Nothing to do if the packet is neither IPv4 nor IPv6. */
return;
}
/* Note: Intel NICs need the checksum set to zero
* and proper l2/l3 lens to be set.
*/
m->l3_len = iph_len;
m->l2_len = offset - rte_pktmbuf_headroom(m);
/* calculate TCP/UDP checksum */
if (likely(iph_proto == VR_IP_PROTO_UDP)) {
m->ol_flags |= PKT_TX_UDP_CKSUM;
udph = (struct vr_udp *)pkt_data_at_offset(pkt, offset + iph_len);
udph->udp_csum = 0;
if (iph)
udph->udp_csum = rte_ipv4_phdr_cksum((struct ipv4_hdr *)iph, m->ol_flags);
else if (ip6h)
udph->udp_csum = rte_ipv6_phdr_cksum((struct ipv6_hdr *)ip6h, m->ol_flags);
} else if (likely(iph_proto == VR_IP_PROTO_TCP)) {
m->ol_flags |= PKT_TX_TCP_CKSUM;
tcph = (struct vr_tcp *)pkt_data_at_offset(pkt, offset + iph_len);
tcph->tcp_csum = 0;
if (iph)
tcph->tcp_csum = rte_ipv4_phdr_cksum((struct ipv4_hdr *)iph, m->ol_flags);
else if (ip6h)
tcph->tcp_csum = rte_ipv6_phdr_cksum((struct ipv6_hdr *)ip6h, m->ol_flags);
}
}
static inline void
dpdk_ipv4_sw_iphdr_checksum_at_offset(struct vr_packet *pkt, unsigned offset)
{
struct vr_ip *iph;
RTE_VERIFY(0 < offset);
iph = (struct vr_ip *)pkt_data_at_offset(pkt, offset);
iph->ip_csum = vr_ip_csum(iph);
}
static inline void
dpdk_sw_checksum_at_offset(struct vr_packet *pkt, unsigned offset)
{
struct vr_ip *iph = NULL;
struct vr_ip6 *ip6h = NULL;
unsigned char iph_len = 0, iph_proto = 0;
struct vr_udp *udph;
struct vr_tcp *tcph;
RTE_VERIFY(0 < offset);
if (pkt->vp_type == VP_TYPE_IP || pkt->vp_type == VP_TYPE_IPOIP) {
iph = (struct vr_ip *)pkt_data_at_offset(pkt, offset);
iph->ip_csum = vr_ip_csum(iph);
iph_len = iph->ip_hl * 4;
iph_proto = iph->ip_proto;
} else if (pkt->vp_type == VP_TYPE_IP6 || pkt->vp_type == VP_TYPE_IP6OIP) {
ip6h = (struct vr_ip6 *)pkt_data_at_offset(pkt, offset);
iph_len = sizeof(struct vr_ip6);
iph_proto = ip6h->ip6_nxt;
} else {
/* Nothing to do if the packet is neither IPv4 nor IPv6. */
return;
}
if (iph_proto == VR_IP_PROTO_UDP) {
udph = (struct vr_udp *)pkt_data_at_offset(pkt, offset + iph_len);
udph->udp_csum = 0;
if (iph)
udph->udp_csum = rte_ipv4_udptcp_cksum((struct ipv4_hdr *)iph, udph);
else if (ip6h)
udph->udp_csum = rte_ipv6_udptcp_cksum((struct ipv6_hdr *)ip6h, udph);
} else if (iph_proto == VR_IP_PROTO_TCP) {
tcph = (struct vr_tcp *)pkt_data_at_offset(pkt, offset + iph_len);
tcph->tcp_csum = 0;
if (iph)
tcph->tcp_csum = rte_ipv4_udptcp_cksum((struct ipv4_hdr *)iph, tcph);
else if (ip6h)
tcph->tcp_csum = rte_ipv6_udptcp_cksum((struct ipv6_hdr *)ip6h, tcph);
}
}
static inline void
dpdk_ipv4_outer_tunnel_hw_checksum(struct vr_packet *pkt)
{
struct rte_mbuf *m = vr_dpdk_pkt_to_mbuf(pkt);
unsigned offset = pkt->vp_data + sizeof(struct ether_hdr);
struct vr_ip *iph = (struct vr_ip *)pkt_data_at_offset(pkt, offset);
unsigned iph_len = iph->ip_hl * 4;
m->ol_flags |= PKT_TX_IP_CKSUM | PKT_TX_IPV4;
iph->ip_csum = 0;
m->l3_len = iph_len;
m->l2_len = offset - rte_pktmbuf_headroom(m);
}
static inline void
dpdk_ipv4_outer_tunnel_sw_checksum(struct vr_packet *pkt)
{
unsigned offset = pkt->vp_data + sizeof(struct ether_hdr);
struct vr_ip *iph = (struct vr_ip *)pkt_data_at_offset(pkt, offset);
iph->ip_csum = vr_ip_csum(iph);
}
static inline void
dpdk_hw_checksum(struct vr_packet *pkt)
{
/* if a tunnel */
if (vr_pkt_type_is_overlay(pkt->vp_type)) {
/* calculate outer checksum in soft */
dpdk_ipv4_sw_iphdr_checksum_at_offset(pkt,
pkt->vp_data + sizeof(struct ether_hdr));
/* calculate inner checksum in hardware */
dpdk_hw_checksum_at_offset(pkt, pkt_get_inner_network_header_off(pkt));
} else if (VP_TYPE_IP == pkt->vp_type || VP_TYPE_IP6 == pkt->vp_type) {
/* normal IPv4 or IPv6 packet */
dpdk_hw_checksum_at_offset(pkt, pkt->vp_data + sizeof(struct ether_hdr));
}
}
static inline void
dpdk_sw_checksum(struct vr_packet *pkt, bool will_fragment)
{
/* if a tunnel */
if (vr_pkt_type_is_overlay(pkt->vp_type)) {
/* calculate outer checksum */
if (!will_fragment)
dpdk_ipv4_sw_iphdr_checksum_at_offset(pkt,
pkt->vp_data + sizeof(struct ether_hdr));
/* calculate inner checksum */
dpdk_sw_checksum_at_offset(pkt, pkt_get_inner_network_header_off(pkt));
} else if (VP_TYPE_IP == pkt->vp_type || VP_TYPE_IP6 == pkt->vp_type) {
/* normal IPv4 or IPv6 packet */
dpdk_sw_checksum_at_offset(pkt, pkt->vp_data + sizeof(struct ether_hdr));
}
}
static uint16_t
dpdk_get_ether_header_len(const void *data)
{
struct ether_hdr *eth = (struct ether_hdr *)data;
if (ntohs(eth->ether_type) == ETHER_TYPE_VLAN)
return sizeof(struct ether_hdr) + sizeof(struct vlan_hdr);
else
return sizeof(struct ether_hdr);
}
/**
* Fragment the input packet
*
* Please take note that the caller is responsible for freeing the input
* packet. All output fragments are hold in mbuf chains. Since we do not
* support the mbuf chains at the moment, there is no vr_packet structure
* attached to the mbufs and none of the functions using the struct can not be
* used.
*
* @param pkt The packet to be fragmented
* @param mbuf_in An mbuf of the inpun packet
* @param mbuf_out An array of mbuf pointers to hold output packets' mbufs
* @param out_num Size of the mbuf_out array
* @param mtu_size MTU size
* @param do_outer_ip_csum Whether calculate the outer IP checksum (in
* software)
* @param lcore_id An ID of the lcore executing this function
*
* @return Number of output fragments (packets)
*/
static int
dpdk_fragment_packet(struct vr_packet *pkt, struct rte_mbuf *mbuf_in,
struct rte_mbuf **mbuf_out, const unsigned short out_num,
const unsigned short mtu_size, bool do_outer_ip_csum,
const unsigned lcore_id)
{
int number_of_packets;
uint16_t outer_header_len;
struct rte_mempool *pool_direct, *pool_indirect;
struct rte_mbuf *m;
int i;
unsigned char *original_header_ptr;
uint16_t max_frag_size;
outer_header_len = pkt_get_inner_network_header_off(pkt) -
pkt_head_space(pkt);
original_header_ptr = pkt_data(pkt);
/* Get into the inner IP header */
rte_pktmbuf_adj(mbuf_in, outer_header_len);
/* Fragment the packet */
pool_direct = vr_dpdk.frag_direct_mempool;
pool_indirect = vr_dpdk.frag_indirect_mempool;
/* Fragment with the maximum size of (MTU - outer_header_length) to leave a
* space for the header prepended later. In addition DPDK requires that the
* (max frag size - IP header) length is a multiple of 8, therefore the
* calculations below. */
max_frag_size = mtu_size - outer_header_len - sizeof(struct vr_ip);
max_frag_size &= ~7U;
max_frag_size += sizeof(struct vr_ip);
number_of_packets = rte_ipv4_fragment_packet(mbuf_in, mbuf_out, out_num,
max_frag_size, pool_direct, pool_indirect);
if (number_of_packets < 0)
return number_of_packets;
/* Adjust outer and inner IP headers for each fragmented packets */
for (i = 0; i < number_of_packets; ++i) {
m = mbuf_out[i];
/* Inner header operations */
struct vr_ip *inner_ip = rte_pktmbuf_mtod(m, struct vr_ip *);
inner_ip->ip_csum = 0;
inner_ip->ip_csum = vr_ip_csum(inner_ip);
/* Outer header operations */
char *outer_header_ptr = rte_pktmbuf_prepend(m, outer_header_len);
rte_memcpy(outer_header_ptr, original_header_ptr, outer_header_len);
uint16_t eth_hlen = dpdk_get_ether_header_len(outer_header_ptr);
struct vr_ip *outer_ip = (struct vr_ip *)(outer_header_ptr + eth_hlen);
outer_ip->ip_len = htons(rte_pktmbuf_pkt_len(m) - eth_hlen);
m->l2_len = mbuf_in->l2_len;
m->l3_len = mbuf_in->l3_len;
/* Copy inner IP id to outer. Currently, the Agent diagnostics depends
* on that. */
outer_ip->ip_id = inner_ip->ip_id;
/* Adjust UDP length to match IP frament size */
if (outer_ip->ip_proto == VR_IP_PROTO_UDP) {
unsigned header_len = outer_ip->ip_hl * 4;
struct vr_udp *udp = (struct vr_udp *)((char *)outer_ip +
header_len);
udp->udp_length = htons(ntohs(outer_ip->ip_len) - header_len);
}
/* If it is necessary to calculate (in software) IP header checksum.
* TODO: This would not be needed if:
* 1. We would support mbuf chains. The functions that calculate the
* checksums, which uses vr_pkt struct could be used after fragmentation
* 2. We would rewrite the checksumming functions to use mbufs and not
* the vr_pkt struct, and use them after fragmentation. */
if (do_outer_ip_csum) {
outer_ip->ip_csum = vr_ip_csum(outer_ip);
m->ol_flags &= ~PKT_TX_IP_CKSUM;
}
}
return number_of_packets;
}
/* TX packet callback */
static int
dpdk_if_tx(struct vr_interface *vif, struct vr_packet *pkt)
{
const unsigned lcore_id = rte_lcore_id();
struct vr_dpdk_lcore * const lcore = vr_dpdk.lcores[lcore_id];
struct rte_mbuf *m = vr_dpdk_pkt_to_mbuf(pkt);
unsigned vif_idx = vif->vif_idx;
struct vr_dpdk_queue *tx_queue = &lcore->lcore_tx_queues[vif_idx];
struct vr_dpdk_queue *monitoring_tx_queue;
struct vr_packet *p_clone;
struct vr_interface_stats *stats;
int ret;
struct rte_mbuf *mbufs_out[VR_DPDK_FRAG_MAX_IP_FRAGS];
int num_of_frags = 1;
int i;
bool will_fragment;
RTE_LOG(DEBUG, VROUTER,"%s: TX packet to interface %s\n", __func__,
vif->vif_name);
stats = vif_get_stats(vif, lcore_id);
/* reset mbuf data pointer and length */
m->data_off = pkt_head_space(pkt);
m->data_len = pkt_head_len(pkt);
/* TODO: we do not support mbuf chains */
m->pkt_len = pkt_head_len(pkt);
if (unlikely(vif->vif_flags & VIF_FLAG_MONITORED)) {
monitoring_tx_queue = &lcore->lcore_tx_queues[vr_dpdk.monitorings[vif_idx]];
if (likely(monitoring_tx_queue && monitoring_tx_queue->txq_ops.f_tx)) {
p_clone = vr_pclone(pkt);
if (likely(p_clone != NULL)) {
monitoring_tx_queue->txq_ops.f_tx(monitoring_tx_queue->q_queue_h,
vr_dpdk_pkt_to_mbuf(p_clone));
}
}
}
if (unlikely(vif->vif_type == VIF_TYPE_AGENT)) {
ret = rte_ring_mp_enqueue(vr_dpdk.packet_ring, m);
if (likely(ret == 0)) {
stats->vis_queue_opackets++;
} else {
/* TODO: a separate counter for this drop */
vr_dpdk_pfree(m, VP_DROP_INTERFACE_DROP);
stats->vis_queue_oerrors++;
/* return 0 so we do not increment vif error counter */
return 0;
}
#ifdef VR_DPDK_TX_PKT_DUMP
#ifdef VR_DPDK_PKT_DUMP_VIF_FILTER
if (VR_DPDK_PKT_DUMP_VIF_FILTER(vif))
#endif
rte_pktmbuf_dump(stdout, m, 0x60);
#endif
vr_dpdk_packet_wakeup(vif);
return 0;
}
/* Set a flag indicating that the packet being processed is going to be
* fragmented as after prepending outer header it exceeds the MTU size of
* an interface. */
will_fragment = (vr_pkt_type_is_overlay(pkt->vp_type) &&
vif->vif_mtu < rte_pktmbuf_pkt_len(m));
/*
* With DPDK pktmbufs we don't know if the checksum is incomplete,
* i.e. there is no direct equivalent of skb->ip_summed field.
*
* So we just rely on VP_FLAG_CSUM_PARTIAL flag here, assuming
* the flag is set when we need to calculate inner or outer packet
* checksum.
*
* This is not elegant and need to be addressed.
* See dpdk/app/test-pmd/csumonly.c for more checksum examples
*/
if (unlikely(pkt->vp_flags & VP_FLAG_CSUM_PARTIAL)) {