This provides flexibility in multiprocess scenarios
(where the KNI is created in the primary process but the callbacks are handled in the secondary one).
The constraint is that a single process can register and handle the requests.
-
-.. _kni_vhost_backend-label:
-
-KNI Working as a Kernel vHost Backend
--------------------------------------
-
-vHost is a kernel module usually working as the backend of virtio (a para- virtualization driver framework)
-to accelerate the traffic from the guest to the host.
-The DPDK Kernel NIC interface provides the ability to hookup vHost traffic into userspace DPDK application.
-Together with the DPDK PMD virtio, it significantly improves the throughput between guest and host.
-In the scenario where DPDK is running as fast path in the host, kni-vhost is an efficient path for the traffic.
-
-Overview
-~~~~~~~~
-
-vHost-net has three kinds of real backend implementations. They are: 1) tap, 2) macvtap and 3) RAW socket.
-The main idea behind kni-vhost is making the KNI work as a RAW socket, attaching it as the backend instance of vHost-net.
-It is using the existing interface with vHost-net, so it does not require any kernel hacking,
-and is fully-compatible with the kernel vhost module.
-As vHost is still taking responsibility for communicating with the front-end virtio,
-it naturally supports both legacy virtio -net and the DPDK PMD virtio.
-There is a little penalty that comes from the non-polling mode of vhost.
-However, it scales throughput well when using KNI in multi-thread mode.
-
-.. _figure_vhost_net_arch2:
-
-.. figure:: img/vhost_net_arch.*
-
- vHost-net Architecture Overview
-
-
-Packet Flow
-~~~~~~~~~~~
-
-There is only a minor difference from the original KNI traffic flows.
-On transmit side, vhost kthread calls the RAW socket's ops sendmsg and it puts the packets into the KNI transmit FIFO.
-On the receive side, the kni kthread gets packets from the KNI receive FIFO, puts them into the queue of the raw socket,
-and wakes up the task in vhost kthread to begin receiving.
-All the packet copying, irrespective of whether it is on the transmit or receive side,
-happens in the context of vhost kthread.
-Every vhost-net device is exposed to a front end virtio device in the guest.
-
-.. _figure_kni_traffic_flow:
-
-.. figure:: img/kni_traffic_flow.*
-
- KNI Traffic Flow
-
-
-Sample Usage
-~~~~~~~~~~~~
-
-Before starting to use KNI as the backend of vhost, the CONFIG_RTE_KNI_VHOST configuration option must be turned on.
-Otherwise, by default, KNI will not enable its backend support capability.
-
-Of course, as a prerequisite, the vhost/vhost-net kernel CONFIG should be chosen before compiling the kernel.
-
-#. Compile the DPDK and insert uio_pci_generic/igb_uio kernel modules as normal.
-
-#. Insert the KNI kernel module:
-
- .. code-block:: console
-
- insmod ./rte_kni.ko
-
- If using KNI in multi-thread mode, use the following command line:
-
- .. code-block:: console
-
- insmod ./rte_kni.ko kthread_mode=multiple
-
-#. Running the KNI sample application:
-
- .. code-block:: console
-
- examples/kni/build/app/kni -c -0xf0 -n 4 -- -p 0x3 -P --config="(0,4,6),(1,5,7)"
-
- This command runs the kni sample application with two physical ports.
- Each port pins two forwarding cores (ingress/egress) in user space.
-
-#. Assign a raw socket to vhost-net during qemu-kvm startup.
- The DPDK does not provide a script to do this since it is easy for the user to customize.
- The following shows the key steps to launch qemu-kvm with kni-vhost:
-
- .. code-block:: bash
-
- #!/bin/bash
- echo 1 > /sys/class/net/vEth0/sock_en
- fd=`cat /sys/class/net/vEth0/sock_fd`
- qemu-kvm \
- -name vm1 -cpu host -m 2048 -smp 1 -hda /opt/vm-fc16.img \
- -netdev tap,fd=$fd,id=hostnet1,vhost=on \
- -device virti-net-pci,netdev=hostnet1,id=net1,bus=pci.0,addr=0x4
-
-It is simple to enable raw socket using sysfs sock_en and get raw socket fd using sock_fd under the KNI device node.
-
-Then, using the qemu-kvm command with the -netdev option to assign such raw socket fd as vhost's backend.
-
-.. note::
-
- The key word tap must exist as qemu-kvm now only supports vhost with a tap backend, so here we cheat qemu-kvm by an existing fd.
-
-Compatibility Configure Option
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-There is a CONFIG_RTE_KNI_VHOST_VNET_HDR_EN configuration option in DPDK configuration file.
-By default, it set to n, which means do not turn on the virtio net header,
-which is used to support additional features (such as, csum offload, vlan offload, generic-segmentation and so on),
-since the kni-vhost does not yet support those features.
-
-Even if the option is turned on, kni-vhost will ignore the information that the header contains.
-When working with legacy virtio on the guest, it is better to turn off unsupported offload features using ethtool -K.
-Otherwise, there may be problems such as an incorrect L4 checksum error.
+++ /dev/null
-/*-
- * GPL LICENSE SUMMARY
- *
- * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- * The full GNU General Public License is included in this distribution
- * in the file called LICENSE.GPL.
- *
- * Contact Information:
- * Intel Corporation
- */
-
-#include <linux/module.h>
-#include <linux/net.h>
-#include <net/sock.h>
-#include <linux/virtio_net.h>
-#include <linux/wait.h>
-#include <linux/mm.h>
-#include <linux/nsproxy.h>
-#include <linux/sched.h>
-#include <linux/if_tun.h>
-#include <linux/version.h>
-#include <linux/file.h>
-
-#include "compat.h"
-#include "kni_dev.h"
-#include "kni_fifo.h"
-
-#define RX_BURST_SZ 4
-
-#ifdef HAVE_STATIC_SOCK_MAP_FD
-static int kni_sock_map_fd(struct socket *sock)
-{
- struct file *file;
- int fd = get_unused_fd_flags(0);
-
- if (fd < 0)
- return fd;
-
- file = sock_alloc_file(sock, 0, NULL);
- if (IS_ERR(file)) {
- put_unused_fd(fd);
- return PTR_ERR(file);
- }
- fd_install(fd, file);
- return fd;
-}
-#endif
-
-static struct proto kni_raw_proto = {
- .name = "kni_vhost",
- .owner = THIS_MODULE,
- .obj_size = sizeof(struct kni_vhost_queue),
-};
-
-static inline int
-kni_vhost_net_tx(struct kni_dev *kni, struct msghdr *m,
- uint32_t offset, uint32_t len)
-{
- struct rte_kni_mbuf *pkt_kva = NULL;
- struct rte_kni_mbuf *pkt_va = NULL;
- int ret;
-
- pr_debug("tx offset=%d, len=%d, iovlen=%d\n",
-#ifdef HAVE_IOV_ITER_MSGHDR
- offset, len, (int)m->msg_iter.iov->iov_len);
-#else
- offset, len, (int)m->msg_iov->iov_len);
-#endif
-
- /**
- * Check if it has at least one free entry in tx_q and
- * one entry in alloc_q.
- */
- if (kni_fifo_free_count(kni->tx_q) == 0 ||
- kni_fifo_count(kni->alloc_q) == 0) {
- /**
- * If no free entry in tx_q or no entry in alloc_q,
- * drops skb and goes out.
- */
- goto drop;
- }
-
- /* dequeue a mbuf from alloc_q */
- ret = kni_fifo_get(kni->alloc_q, (void **)&pkt_va, 1);
- if (likely(ret == 1)) {
- void *data_kva;
-
- pkt_kva = (void *)pkt_va - kni->mbuf_va + kni->mbuf_kva;
- data_kva = pkt_kva->buf_addr + pkt_kva->data_off
- - kni->mbuf_va + kni->mbuf_kva;
-
-#ifdef HAVE_IOV_ITER_MSGHDR
- copy_from_iter(data_kva, len, &m->msg_iter);
-#else
- memcpy_fromiovecend(data_kva, m->msg_iov, offset, len);
-#endif
-
- if (unlikely(len < ETH_ZLEN)) {
- memset(data_kva + len, 0, ETH_ZLEN - len);
- len = ETH_ZLEN;
- }
- pkt_kva->pkt_len = len;
- pkt_kva->data_len = len;
-
- /* enqueue mbuf into tx_q */
- ret = kni_fifo_put(kni->tx_q, (void **)&pkt_va, 1);
- if (unlikely(ret != 1)) {
- /* Failing should not happen */
- pr_err("Fail to enqueue mbuf into tx_q\n");
- goto drop;
- }
- } else {
- /* Failing should not happen */
- pr_err("Fail to dequeue mbuf from alloc_q\n");
- goto drop;
- }
-
- /* update statistics */
- kni->stats.tx_bytes += len;
- kni->stats.tx_packets++;
-
- return 0;
-
-drop:
- /* update statistics */
- kni->stats.tx_dropped++;
-
- return 0;
-}
-
-static inline int
-kni_vhost_net_rx(struct kni_dev *kni, struct msghdr *m,
- uint32_t offset, uint32_t len)
-{
- uint32_t pkt_len;
- struct rte_kni_mbuf *kva;
- struct rte_kni_mbuf *va;
- void *data_kva;
- struct sk_buff *skb;
- struct kni_vhost_queue *q = kni->vhost_queue;
-
- if (unlikely(q == NULL))
- return 0;
-
- /* ensure at least one entry in free_q */
- if (unlikely(kni_fifo_free_count(kni->free_q) == 0))
- return 0;
-
- skb = skb_dequeue(&q->sk.sk_receive_queue);
- if (unlikely(skb == NULL))
- return 0;
-
- kva = (struct rte_kni_mbuf *)skb->data;
-
- /* free skb to cache */
- skb->data = NULL;
- if (unlikely(kni_fifo_put(q->fifo, (void **)&skb, 1) != 1))
- /* Failing should not happen */
- pr_err("Fail to enqueue entries into rx cache fifo\n");
-
- pkt_len = kva->data_len;
- if (unlikely(pkt_len > len))
- goto drop;
-
- pr_debug("rx offset=%d, len=%d, pkt_len=%d, iovlen=%d\n",
-#ifdef HAVE_IOV_ITER_MSGHDR
- offset, len, pkt_len, (int)m->msg_iter.iov->iov_len);
-#else
- offset, len, pkt_len, (int)m->msg_iov->iov_len);
-#endif
-
- data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va + kni->mbuf_kva;
-#ifdef HAVE_IOV_ITER_MSGHDR
- if (unlikely(copy_to_iter(data_kva, pkt_len, &m->msg_iter)))
-#else
- if (unlikely(memcpy_toiovecend(m->msg_iov, data_kva, offset, pkt_len)))
-#endif
- goto drop;
-
- /* Update statistics */
- kni->stats.rx_bytes += pkt_len;
- kni->stats.rx_packets++;
-
- /* enqueue mbufs into free_q */
- va = (void *)kva - kni->mbuf_kva + kni->mbuf_va;
- if (unlikely(kni_fifo_put(kni->free_q, (void **)&va, 1) != 1))
- /* Failing should not happen */
- pr_err("Fail to enqueue entries into free_q\n");
-
- pr_debug("receive done %d\n", pkt_len);
-
- return pkt_len;
-
-drop:
- /* Update drop statistics */
- kni->stats.rx_dropped++;
-
- return 0;
-}
-
-static uint32_t
-kni_sock_poll(struct file *file, struct socket *sock, poll_table *wait)
-{
- struct kni_vhost_queue *q =
- container_of(sock->sk, struct kni_vhost_queue, sk);
- struct kni_dev *kni;
- uint32_t mask = 0;
-
- if (unlikely(q == NULL || q->kni == NULL))
- return POLLERR;
-
- kni = q->kni;
-#ifdef HAVE_SOCKET_WQ
- pr_debug("start kni_poll on group %d, wq 0x%16llx\n",
- kni->group_id, (uint64_t)sock->wq);
- poll_wait(file, &sock->wq->wait, wait);
-#else
- pr_debug("start kni_poll on group %d, wait at 0x%16llx\n",
- kni->group_id, (uint64_t)&sock->wait);
- poll_wait(file, &sock->wait, wait);
-#endif
-
- if (kni_fifo_count(kni->rx_q) > 0)
- mask |= POLLIN | POLLRDNORM;
-
- if (sock_writeable(&q->sk) ||
-#ifdef SOCKWQ_ASYNC_NOSPACE
- (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock->flags) &&
- sock_writeable(&q->sk)))
-#else
- (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock->flags) &&
- sock_writeable(&q->sk)))
-#endif
- mask |= POLLOUT | POLLWRNORM;
-
- return mask;
-}
-
-static inline void
-kni_vhost_enqueue(struct kni_dev *kni, struct kni_vhost_queue *q,
- struct sk_buff *skb, struct rte_kni_mbuf *va)
-{
- struct rte_kni_mbuf *kva;
-
- kva = (void *)(va) - kni->mbuf_va + kni->mbuf_kva;
- (skb)->data = (unsigned char *)kva;
- (skb)->len = kva->data_len;
- skb_queue_tail(&q->sk.sk_receive_queue, skb);
-}
-
-static inline void
-kni_vhost_enqueue_burst(struct kni_dev *kni, struct kni_vhost_queue *q,
- struct sk_buff **skb, struct rte_kni_mbuf **va)
-{
- int i;
-
- for (i = 0; i < RX_BURST_SZ; skb++, va++, i++)
- kni_vhost_enqueue(kni, q, *skb, *va);
-}
-
-int
-kni_chk_vhost_rx(struct kni_dev *kni)
-{
- struct kni_vhost_queue *q = kni->vhost_queue;
- uint32_t nb_in, nb_mbuf, nb_skb;
- const uint32_t BURST_MASK = RX_BURST_SZ - 1;
- uint32_t nb_burst, nb_backlog, i;
- struct sk_buff *skb[RX_BURST_SZ];
- struct rte_kni_mbuf *va[RX_BURST_SZ];
-
- if (unlikely(BE_STOP & kni->vq_status)) {
- kni->vq_status |= BE_FINISH;
- return 0;
- }
-
- if (unlikely(q == NULL))
- return 0;
-
- nb_skb = kni_fifo_count(q->fifo);
- nb_mbuf = kni_fifo_count(kni->rx_q);
-
- nb_in = min(nb_mbuf, nb_skb);
- nb_in = min_t(uint32_t, nb_in, RX_BURST_SZ);
- nb_burst = (nb_in & ~BURST_MASK);
- nb_backlog = (nb_in & BURST_MASK);
-
- /* enqueue skb_queue per BURST_SIZE bulk */
- if (nb_burst != 0) {
- if (unlikely(kni_fifo_get(kni->rx_q, (void **)&va, RX_BURST_SZ)
- != RX_BURST_SZ))
- goto except;
-
- if (unlikely(kni_fifo_get(q->fifo, (void **)&skb, RX_BURST_SZ)
- != RX_BURST_SZ))
- goto except;
-
- kni_vhost_enqueue_burst(kni, q, skb, va);
- }
-
- /* all leftover, do one by one */
- for (i = 0; i < nb_backlog; ++i) {
- if (unlikely(kni_fifo_get(kni->rx_q, (void **)&va, 1) != 1))
- goto except;
-
- if (unlikely(kni_fifo_get(q->fifo, (void **)&skb, 1) != 1))
- goto except;
-
- kni_vhost_enqueue(kni, q, *skb, *va);
- }
-
- /* Ondemand wake up */
- if ((nb_in == RX_BURST_SZ) || (nb_skb == 0) ||
- ((nb_mbuf < RX_BURST_SZ) && (nb_mbuf != 0))) {
- wake_up_interruptible_poll(sk_sleep(&q->sk),
- POLLIN | POLLRDNORM | POLLRDBAND);
- pr_debug("RX CHK KICK nb_mbuf %d, nb_skb %d, nb_in %d\n",
- nb_mbuf, nb_skb, nb_in);
- }
-
- return 0;
-
-except:
- /* Failing should not happen */
- pr_err("Fail to enqueue fifo, it shouldn't happen\n");
- BUG_ON(1);
-
- return 0;
-}
-
-static int
-#ifdef HAVE_KIOCB_MSG_PARAM
-kni_sock_sndmsg(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t total_len)
-#else
-kni_sock_sndmsg(struct socket *sock,
- struct msghdr *m, size_t total_len)
-#endif /* HAVE_KIOCB_MSG_PARAM */
-{
- struct kni_vhost_queue *q =
- container_of(sock->sk, struct kni_vhost_queue, sk);
- int vnet_hdr_len = 0;
- unsigned long len = total_len;
-
- if (unlikely(q == NULL || q->kni == NULL))
- return 0;
-
- pr_debug("kni_sndmsg len %ld, flags 0x%08x, nb_iov %d\n",
-#ifdef HAVE_IOV_ITER_MSGHDR
- len, q->flags, (int)m->msg_iter.iov->iov_len);
-#else
- len, q->flags, (int)m->msg_iovlen);
-#endif
-
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- if (likely(q->flags & IFF_VNET_HDR)) {
- vnet_hdr_len = q->vnet_hdr_sz;
- if (unlikely(len < vnet_hdr_len))
- return -EINVAL;
- len -= vnet_hdr_len;
- }
-#endif
-
- if (unlikely(len < ETH_HLEN + q->vnet_hdr_sz))
- return -EINVAL;
-
- return kni_vhost_net_tx(q->kni, m, vnet_hdr_len, len);
-}
-
-static int
-#ifdef HAVE_KIOCB_MSG_PARAM
-kni_sock_rcvmsg(struct kiocb *iocb, struct socket *sock,
- struct msghdr *m, size_t len, int flags)
-#else
-kni_sock_rcvmsg(struct socket *sock,
- struct msghdr *m, size_t len, int flags)
-#endif /* HAVE_KIOCB_MSG_PARAM */
-{
- int vnet_hdr_len = 0;
- int pkt_len = 0;
- struct kni_vhost_queue *q =
- container_of(sock->sk, struct kni_vhost_queue, sk);
- static struct virtio_net_hdr
- __attribute__ ((unused)) vnet_hdr = {
- .flags = 0,
- .gso_type = VIRTIO_NET_HDR_GSO_NONE
- };
-
- if (unlikely(q == NULL || q->kni == NULL))
- return 0;
-
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- if (likely(q->flags & IFF_VNET_HDR)) {
- vnet_hdr_len = q->vnet_hdr_sz;
- len -= vnet_hdr_len;
- if (len < 0)
- return -EINVAL;
- }
-#endif
-
- pkt_len = kni_vhost_net_rx(q->kni, m, vnet_hdr_len, len);
- if (unlikely(pkt_len == 0))
- return 0;
-
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- /* no need to copy hdr when no pkt received */
-#ifdef HAVE_IOV_ITER_MSGHDR
- if (unlikely(copy_to_iter((void *)&vnet_hdr, vnet_hdr_len,
- &m->msg_iter)))
-#else
- if (unlikely(memcpy_toiovecend(m->msg_iov,
- (void *)&vnet_hdr, 0, vnet_hdr_len)))
-#endif /* HAVE_IOV_ITER_MSGHDR */
- return -EFAULT;
-#endif /* RTE_KNI_VHOST_VNET_HDR_EN */
- pr_debug("kni_rcvmsg expect_len %ld, flags 0x%08x, pkt_len %d\n",
- (unsigned long)len, q->flags, pkt_len);
-
- return pkt_len + vnet_hdr_len;
-}
-
-/* dummy tap like ioctl */
-static int
-kni_sock_ioctl(struct socket *sock, uint32_t cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- struct ifreq __user *ifr = argp;
- uint32_t __user *up = argp;
- struct kni_vhost_queue *q =
- container_of(sock->sk, struct kni_vhost_queue, sk);
- struct kni_dev *kni;
- uint32_t u;
- int __user *sp = argp;
- int s;
- int ret;
-
- pr_debug("tap ioctl cmd 0x%08x\n", cmd);
-
- switch (cmd) {
- case TUNSETIFF:
- pr_debug("TUNSETIFF\n");
- /* ignore the name, just look at flags */
- if (get_user(u, &ifr->ifr_flags))
- return -EFAULT;
-
- ret = 0;
- if ((u & ~IFF_VNET_HDR) != (IFF_NO_PI | IFF_TAP))
- ret = -EINVAL;
- else
- q->flags = u;
-
- return ret;
-
- case TUNGETIFF:
- pr_debug("TUNGETIFF\n");
- rcu_read_lock_bh();
- kni = rcu_dereference_bh(q->kni);
- if (kni)
- dev_hold(kni->net_dev);
- rcu_read_unlock_bh();
-
- if (!kni)
- return -ENOLINK;
-
- ret = 0;
- if (copy_to_user(&ifr->ifr_name, kni->net_dev->name, IFNAMSIZ)
- || put_user(q->flags, &ifr->ifr_flags))
- ret = -EFAULT;
- dev_put(kni->net_dev);
- return ret;
-
- case TUNGETFEATURES:
- pr_debug("TUNGETFEATURES\n");
- u = IFF_TAP | IFF_NO_PI;
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- u |= IFF_VNET_HDR;
-#endif
- if (put_user(u, up))
- return -EFAULT;
- return 0;
-
- case TUNSETSNDBUF:
- pr_debug("TUNSETSNDBUF\n");
- if (get_user(u, up))
- return -EFAULT;
-
- q->sk.sk_sndbuf = u;
- return 0;
-
- case TUNGETVNETHDRSZ:
- s = q->vnet_hdr_sz;
- if (put_user(s, sp))
- return -EFAULT;
- pr_debug("TUNGETVNETHDRSZ %d\n", s);
- return 0;
-
- case TUNSETVNETHDRSZ:
- if (get_user(s, sp))
- return -EFAULT;
- if (s < (int)sizeof(struct virtio_net_hdr))
- return -EINVAL;
-
- pr_debug("TUNSETVNETHDRSZ %d\n", s);
- q->vnet_hdr_sz = s;
- return 0;
-
- case TUNSETOFFLOAD:
- pr_debug("TUNSETOFFLOAD %lx\n", arg);
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- /* not support any offload yet */
- if (!(q->flags & IFF_VNET_HDR))
- return -EINVAL;
-
- return 0;
-#else
- return -EINVAL;
-#endif
-
- default:
- pr_debug("NOT SUPPORT\n");
- return -EINVAL;
- }
-}
-
-static int
-kni_sock_compat_ioctl(struct socket *sock, uint32_t cmd,
- unsigned long arg)
-{
- /* 32 bits app on 64 bits OS to be supported later */
- pr_debug("Not implemented.\n");
-
- return -EINVAL;
-}
-
-#define KNI_VHOST_WAIT_WQ_SAFE() \
-do { \
- while ((BE_FINISH | BE_STOP) == kni->vq_status) \
- msleep(1); \
-} while (0) \
-
-
-static int
-kni_sock_release(struct socket *sock)
-{
- struct kni_vhost_queue *q =
- container_of(sock->sk, struct kni_vhost_queue, sk);
- struct kni_dev *kni;
-
- if (q == NULL)
- return 0;
-
- kni = q->kni;
- if (kni != NULL) {
- kni->vq_status = BE_STOP;
- KNI_VHOST_WAIT_WQ_SAFE();
- kni->vhost_queue = NULL;
- q->kni = NULL;
- }
-
- if (q->sockfd != -1)
- q->sockfd = -1;
-
- sk_set_socket(&q->sk, NULL);
- sock->sk = NULL;
-
- sock_put(&q->sk);
-
- pr_debug("dummy sock release done\n");
-
- return 0;
-}
-
-int
-kni_sock_getname(struct socket *sock, struct sockaddr *addr,
- int *sockaddr_len, int peer)
-{
- pr_debug("dummy sock getname\n");
- ((struct sockaddr_ll *)addr)->sll_family = AF_PACKET;
- return 0;
-}
-
-static const struct proto_ops kni_socket_ops = {
- .getname = kni_sock_getname,
- .sendmsg = kni_sock_sndmsg,
- .recvmsg = kni_sock_rcvmsg,
- .release = kni_sock_release,
- .poll = kni_sock_poll,
- .ioctl = kni_sock_ioctl,
- .compat_ioctl = kni_sock_compat_ioctl,
-};
-
-static void
-kni_sk_write_space(struct sock *sk)
-{
- wait_queue_head_t *wqueue;
-
- if (!sock_writeable(sk) ||
-#ifdef SOCKWQ_ASYNC_NOSPACE
- !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags))
-#else
- !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
-#endif
- return;
- wqueue = sk_sleep(sk);
- if (wqueue && waitqueue_active(wqueue))
- wake_up_interruptible_poll(
- wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
-}
-
-static void
-kni_sk_destruct(struct sock *sk)
-{
- struct kni_vhost_queue *q =
- container_of(sk, struct kni_vhost_queue, sk);
-
- if (!q)
- return;
-
- /* make sure there's no packet in buffer */
- while (skb_dequeue(&sk->sk_receive_queue) != NULL)
- ;
-
- mb();
-
- if (q->fifo != NULL) {
- kfree(q->fifo);
- q->fifo = NULL;
- }
-
- if (q->cache != NULL) {
- kfree(q->cache);
- q->cache = NULL;
- }
-}
-
-static int
-kni_vhost_backend_init(struct kni_dev *kni)
-{
- struct kni_vhost_queue *q;
- struct net *net = current->nsproxy->net_ns;
- int err, i, sockfd;
- struct rte_kni_fifo *fifo;
- struct sk_buff *elem;
-
- if (kni->vhost_queue != NULL)
- return -1;
-
-#ifdef HAVE_SK_ALLOC_KERN_PARAM
- q = (struct kni_vhost_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
- &kni_raw_proto, 0);
-#else
- q = (struct kni_vhost_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
- &kni_raw_proto);
-#endif
- if (!q)
- return -ENOMEM;
-
- err = sock_create_lite(AF_UNSPEC, SOCK_RAW, IPPROTO_RAW, &q->sock);
- if (err)
- goto free_sk;
-
- sockfd = kni_sock_map_fd(q->sock);
- if (sockfd < 0) {
- err = sockfd;
- goto free_sock;
- }
-
- /* cache init */
- q->cache = kzalloc(
- RTE_KNI_VHOST_MAX_CACHE_SIZE * sizeof(struct sk_buff),
- GFP_KERNEL);
- if (!q->cache)
- goto free_fd;
-
- fifo = kzalloc(RTE_KNI_VHOST_MAX_CACHE_SIZE * sizeof(void *)
- + sizeof(struct rte_kni_fifo), GFP_KERNEL);
- if (!fifo)
- goto free_cache;
-
- kni_fifo_init(fifo, RTE_KNI_VHOST_MAX_CACHE_SIZE);
-
- for (i = 0; i < RTE_KNI_VHOST_MAX_CACHE_SIZE; i++) {
- elem = &q->cache[i];
- kni_fifo_put(fifo, (void **)&elem, 1);
- }
- q->fifo = fifo;
-
- /* store sockfd in vhost_queue */
- q->sockfd = sockfd;
-
- /* init socket */
- q->sock->type = SOCK_RAW;
- q->sock->state = SS_CONNECTED;
- q->sock->ops = &kni_socket_ops;
- sock_init_data(q->sock, &q->sk);
-
- /* init sock data */
- q->sk.sk_write_space = kni_sk_write_space;
- q->sk.sk_destruct = kni_sk_destruct;
- q->flags = IFF_NO_PI | IFF_TAP;
- q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
-#ifdef RTE_KNI_VHOST_VNET_HDR_EN
- q->flags |= IFF_VNET_HDR;
-#endif
-
- /* bind kni_dev with vhost_queue */
- q->kni = kni;
- kni->vhost_queue = q;
-
- wmb();
-
- kni->vq_status = BE_START;
-
-#ifdef HAVE_SOCKET_WQ
- pr_debug("backend init sockfd=%d, sock->wq=0x%16llx,sk->sk_wq=0x%16llx",
- q->sockfd, (uint64_t)q->sock->wq,
- (uint64_t)q->sk.sk_wq);
-#else
- pr_debug("backend init sockfd=%d, sock->wait at 0x%16llx,sk->sk_sleep=0x%16llx",
- q->sockfd, (uint64_t)&q->sock->wait,
- (uint64_t)q->sk.sk_sleep);
-#endif
-
- return 0;
-
-free_cache:
- kfree(q->cache);
- q->cache = NULL;
-
-free_fd:
- put_unused_fd(sockfd);
-
-free_sock:
- q->kni = NULL;
- kni->vhost_queue = NULL;
- kni->vq_status |= BE_FINISH;
- sock_release(q->sock);
- q->sock->ops = NULL;
- q->sock = NULL;
-
-free_sk:
- sk_free((struct sock *)q);
-
- return err;
-}
-
-/* kni vhost sock sysfs */
-static ssize_t
-show_sock_fd(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct net_device *net_dev = container_of(dev, struct net_device, dev);
- struct kni_dev *kni = netdev_priv(net_dev);
- int sockfd = -1;
-
- if (kni->vhost_queue != NULL)
- sockfd = kni->vhost_queue->sockfd;
- return snprintf(buf, 10, "%d\n", sockfd);
-}
-
-static ssize_t
-show_sock_en(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- struct net_device *net_dev = container_of(dev, struct net_device, dev);
- struct kni_dev *kni = netdev_priv(net_dev);
-
- return snprintf(buf, 10, "%u\n", (kni->vhost_queue == NULL ? 0 : 1));
-}
-
-static ssize_t
-set_sock_en(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct net_device *net_dev = container_of(dev, struct net_device, dev);
- struct kni_dev *kni = netdev_priv(net_dev);
- unsigned long en;
- int err = 0;
-
- if (kstrtoul(buf, 0, &en) != 0)
- return -EINVAL;
-
- if (en)
- err = kni_vhost_backend_init(kni);
-
- return err ? err : count;
-}
-
-static DEVICE_ATTR(sock_fd, S_IRUGO | S_IRUSR, show_sock_fd, NULL);
-static DEVICE_ATTR(sock_en, S_IRUGO | S_IWUSR, show_sock_en, set_sock_en);
-static struct attribute *dev_attrs[] = {
- &dev_attr_sock_fd.attr,
- &dev_attr_sock_en.attr,
- NULL,
-};
-
-static const struct attribute_group dev_attr_grp = {
- .attrs = dev_attrs,
-};
-
-int
-kni_vhost_backend_release(struct kni_dev *kni)
-{
- struct kni_vhost_queue *q = kni->vhost_queue;
-
- if (q == NULL)
- return 0;
-
- /* dettach from kni */
- q->kni = NULL;
-
- pr_debug("release backend done\n");
-
- return 0;
-}
-
-int
-kni_vhost_init(struct kni_dev *kni)
-{
- struct net_device *dev = kni->net_dev;
-
- if (sysfs_create_group(&dev->dev.kobj, &dev_attr_grp))
- sysfs_remove_group(&dev->dev.kobj, &dev_attr_grp);
-
- kni->vq_status = BE_STOP;
-
- pr_debug("kni_vhost_init done\n");
-
- return 0;
-}
git.droids-corp.org / dpdk.git / commitdiff