cregit-Linux how code gets into the kernel

Release 4.14 drivers/vhost/net.c

Directory: drivers/vhost
/* Copyright (C) 2009 Red Hat, Inc.
 * Author: Michael S. Tsirkin <mst@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 * virtio-net server in host kernel.
 */

#include <linux/compat.h>
#include <linux/eventfd.h>
#include <linux/vhost.h>
#include <linux/virtio_net.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/sched/clock.h>
#include <linux/sched/signal.h>
#include <linux/vmalloc.h>

#include <linux/net.h>
#include <linux/if_packet.h>
#include <linux/if_arp.h>
#include <linux/if_tun.h>
#include <linux/if_macvlan.h>
#include <linux/if_tap.h>
#include <linux/if_vlan.h>
#include <linux/skb_array.h>
#include <linux/skbuff.h>

#include <net/sock.h>

#include "vhost.h"


static int experimental_zcopytx = 1;
module_param(experimental_zcopytx, int, 0444);
MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
		                       " 1 -Enable; 0 - Disable");

/* Max number of bytes transferred before requeueing the job.
 * Using this limit prevents one virtqueue from starving others. */

#define VHOST_NET_WEIGHT 0x80000

/* MAX number of TX used buffers for outstanding zerocopy */

#define VHOST_MAX_PEND 128

#define VHOST_GOODCOPY_LEN 256

/*
 * For transmit, used buffer len is unused; we override it to track buffer
 * status internally; used for zerocopy tx only.
 */
/* Lower device DMA failed */

#define VHOST_DMA_FAILED_LEN	((__force __virtio32)3)
/* Lower device DMA done */

#define VHOST_DMA_DONE_LEN	((__force __virtio32)2)
/* Lower device DMA in progress */

#define VHOST_DMA_IN_PROGRESS	((__force __virtio32)1)
/* Buffer unused */

#define VHOST_DMA_CLEAR_LEN	((__force __virtio32)0)


#define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN)

enum {
	
VHOST_NET_FEATURES = VHOST_FEATURES |
			 (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
			 (1ULL << VIRTIO_NET_F_MRG_RXBUF) |
			 (1ULL << VIRTIO_F_IOMMU_PLATFORM)
};

enum {
	
VHOST_NET_VQ_RX = 0,
	
VHOST_NET_VQ_TX = 1,
	
VHOST_NET_VQ_MAX = 2,
};


struct vhost_net_ubuf_ref {
	/* refcount follows semantics similar to kref:
         *  0: object is released
         *  1: no outstanding ubufs
         * >1: outstanding ubufs
         */
	
atomic_t refcount;
	
wait_queue_head_t wait;
	
struct vhost_virtqueue *vq;
};


#define VHOST_RX_BATCH 64

struct vhost_net_buf {
	
struct sk_buff **queue;
	
int tail;
	
int head;
};


struct vhost_net_virtqueue {
	
struct vhost_virtqueue vq;
	
size_t vhost_hlen;
	
size_t sock_hlen;
	/* vhost zerocopy support fields below: */
	/* last used idx for outstanding DMA zerocopy buffers */
	
int upend_idx;
	/* first used idx for DMA done zerocopy buffers */
	
int done_idx;
	/* an array of userspace buffers info */
	
struct ubuf_info *ubuf_info;
	/* Reference counting for outstanding ubufs.
         * Protected by vq mutex. Writers must also take device mutex. */
	
struct vhost_net_ubuf_ref *ubufs;
	
struct skb_array *rx_array;
	
struct vhost_net_buf rxq;
};


struct vhost_net {
	
struct vhost_dev dev;
	
struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX];
	
struct vhost_poll poll[VHOST_NET_VQ_MAX];
	/* Number of TX recently submitted.
         * Protected by tx vq lock. */
	
unsigned tx_packets;
	/* Number of times zerocopy TX recently failed.
         * Protected by tx vq lock. */
	
unsigned tx_zcopy_err;
	/* Flush in progress. Protected by tx vq lock. */
	
bool tx_flush;
};


static unsigned vhost_net_zcopy_mask __read_mostly;


static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) { if (rxq->tail != rxq->head) return rxq->queue[rxq->head]; else return NULL; }

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static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) { return rxq->tail - rxq->head; }

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static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) { return rxq->tail == rxq->head; }

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static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) { void *ret = vhost_net_buf_get_ptr(rxq); ++rxq->head; return ret; }

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static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) { struct vhost_net_buf *rxq = &nvq->rxq; rxq->head = 0; rxq->tail = skb_array_consume_batched(nvq->rx_array, rxq->queue, VHOST_RX_BATCH); return rxq->tail; }

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static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) { struct vhost_net_buf *rxq = &nvq->rxq; if (nvq->rx_array && !vhost_net_buf_is_empty(rxq)) { skb_array_unconsume(nvq->rx_array, rxq->queue + rxq->head, vhost_net_buf_get_size(rxq)); rxq->head = rxq->tail = 0; } }

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static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) { struct vhost_net_buf *rxq = &nvq->rxq; if (!vhost_net_buf_is_empty(rxq)) goto out; if (!vhost_net_buf_produce(nvq)) return 0; out: return __skb_array_len_with_tag(vhost_net_buf_get_ptr(rxq)); }

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static void vhost_net_buf_init(struct vhost_net_buf *rxq) { rxq->head = rxq->tail = 0; }

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static void vhost_net_enable_zcopy(int vq) { vhost_net_zcopy_mask |= 0x1 << vq; }

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static struct vhost_net_ubuf_ref * vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) { struct vhost_net_ubuf_ref *ubufs; /* No zero copy backend? Nothing to count. */ if (!zcopy) return NULL; ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); if (!ubufs) return ERR_PTR(-ENOMEM); atomic_set(&ubufs->refcount, 1); init_waitqueue_head(&ubufs->wait); ubufs->vq = vq; return ubufs; }

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Asias He7895.12%266.67%
Michael S. Tsirkin44.88%133.33%
Total82100.00%3100.00%


static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) { int r = atomic_sub_return(1, &ubufs->refcount); if (unlikely(!r)) wake_up(&ubufs->wait); return r; }

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Michael S. Tsirkin2762.79%133.33%
Asias He1637.21%266.67%
Total43100.00%3100.00%


static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) { vhost_net_ubuf_put(ubufs); wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); }

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Asias He3093.75%250.00%
Michael S. Tsirkin26.25%250.00%
Total32100.00%4100.00%


static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) { vhost_net_ubuf_put_and_wait(ubufs); kfree(ubufs); }

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Michael S. Tsirkin1571.43%150.00%
Asias He628.57%150.00%
Total21100.00%2100.00%


static void vhost_net_clear_ubuf_info(struct vhost_net *n) { int i; for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { kfree(n->vqs[i].ubuf_info); n->vqs[i].ubuf_info = NULL; } }

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Asias He4076.92%150.00%
Michael S. Tsirkin1223.08%150.00%
Total52100.00%2100.00%


static int vhost_net_set_ubuf_info(struct vhost_net *n) { bool zcopy; int i; for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { zcopy = vhost_net_zcopy_mask & (0x1 << i); if (!zcopy) continue; n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * UIO_MAXIOV, GFP_KERNEL); if (!n->vqs[i].ubuf_info) goto err; } return 0; err: vhost_net_clear_ubuf_info(n); return -ENOMEM; }

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Asias He10498.11%375.00%
Michael S. Tsirkin21.89%125.00%
Total106100.00%4100.00%


static void vhost_net_vq_reset(struct vhost_net *n) { int i; vhost_net_clear_ubuf_info(n); for (i = 0; i < VHOST_NET_VQ_MAX; i++) { n->vqs[i].done_idx = 0; n->vqs[i].upend_idx = 0; n->vqs[i].ubufs = NULL; n->vqs[i].vhost_hlen = 0; n->vqs[i].sock_hlen = 0; vhost_net_buf_init(&n->vqs[i].rxq); } }

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Asias He5957.84%233.33%
Michael S. Tsirkin3029.41%350.00%
Jason (Hui) Wang1312.75%116.67%
Total102100.00%6100.00%


static void vhost_net_tx_packet(struct vhost_net *net) { ++net->tx_packets; if (net->tx_packets < 1024) return; net->tx_packets = 0; net->tx_zcopy_err = 0; }

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Michael S. Tsirkin37100.00%1100.00%
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static void vhost_net_tx_err(struct vhost_net *net) { ++net->tx_zcopy_err; }

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Michael S. Tsirkin16100.00%1100.00%
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static bool vhost_net_tx_select_zcopy(struct vhost_net *net) { /* TX flush waits for outstanding DMAs to be done. * Don't start new DMAs. */ return !net->tx_flush && net->tx_packets / 64 >= net->tx_zcopy_err; }

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Michael S. Tsirkin28100.00%2100.00%
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static bool vhost_sock_zcopy(struct socket *sock) { return unlikely(experimental_zcopytx) && sock_flag(sock->sk, SOCK_ZEROCOPY); }

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Michael S. Tsirkin26100.00%1100.00%
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/* In case of DMA done not in order in lower device driver for some reason. * upend_idx is used to track end of used idx, done_idx is used to track head * of used idx. Once lower device DMA done contiguously, we will signal KVM * guest used idx. */
static void vhost_zerocopy_signal_used(struct vhost_net *net, struct vhost_virtqueue *vq) { struct vhost_net_virtqueue *nvq = container_of(vq, struct vhost_net_virtqueue, vq); int i, add; int j = 0; for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) vhost_net_tx_err(net); if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { vq->heads[i].len = VHOST_DMA_CLEAR_LEN; ++j; } else break; } while (j) { add = min(UIO_MAXIOV - nvq->done_idx, j); vhost_add_used_and_signal_n(vq->dev, vq, &vq->heads[nvq->done_idx], add); nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; j -= add; } }

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Michael S. Tsirkin10962.29%240.00%
Jason (Hui) Wang4827.43%240.00%
Asias He1810.29%120.00%
Total175100.00%5100.00%


static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) { struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; struct vhost_virtqueue *vq = ubufs->vq; int cnt; rcu_read_lock_bh(); /* set len to mark this desc buffers done DMA */ vq->heads[ubuf->desc].len = success ? VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; cnt = vhost_net_ubuf_put(ubufs); /* * Trigger polling thread if guest stopped submitting new buffers: * in this case, the refcount after decrement will eventually reach 1. * We also trigger polling periodically after each 16 packets * (the value 16 here is more or less arbitrary, it's tuned to trigger * less than 10% of times). */ if (cnt <= 1 || !(cnt % 16)) vhost_poll_queue(&vq->poll); rcu_read_unlock_bh(); }

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Michael S. Tsirkin6675.00%571.43%
Jason (Hui) Wang2022.73%114.29%
Asias He22.27%114.29%
Total88100.00%7100.00%


static inline unsigned long busy_clock(void) { return local_clock() >> 10; }

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static bool vhost_can_busy_poll(struct vhost_dev *dev, unsigned long endtime) { return likely(!need_resched()) && likely(!time_after(busy_clock(), endtime)) && likely(!signal_pending(current)) && !vhost_has_work(dev); }

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static void vhost_net_disable_vq(struct vhost_net *n, struct vhost_virtqueue *vq) { struct vhost_net_virtqueue *nvq = container_of(vq, struct vhost_net_virtqueue, vq); struct vhost_poll *poll = n->poll + (nvq - n->vqs); if (!vq->private_data) return; vhost_poll_stop(poll); }

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static int vhost_net_enable_vq(struct vhost_net *n, struct vhost_virtqueue *vq) { struct vhost_net_virtqueue *nvq = container_of(vq, struct vhost_net_virtqueue, vq); struct vhost_poll *poll = n->poll + (nvq - n->vqs); struct socket *sock; sock = vq->private_data; if (!sock) return 0; return vhost_poll_start(poll, sock->file); }

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static int vhost_net_tx_get_vq_desc(struct vhost_net *net, struct vhost_virtqueue *vq, struct iovec iov[], unsigned int iov_size, unsigned int *out_num, unsigned int *in_num) { unsigned long uninitialized_var(endtime); int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), out_num, in_num, NULL, NULL); if (r == vq->num && vq->busyloop_timeout) { preempt_disable(); endtime = busy_clock() + vq->busyloop_timeout; while (vhost_can_busy_poll(vq->dev, endtime) && vhost_vq_avail_empty(vq->dev, vq)) cpu_relax(); preempt_enable(); r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), out_num, in_num, NULL, NULL); } return r; }

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Jason (Hui) Wang14999.33%150.00%
Christian Bornträger10.67%150.00%
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static bool vhost_exceeds_maxpend(struct vhost_net *net) { struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; struct vhost_virtqueue *vq = &nvq->vq; return (nvq->upend_idx + vq->num - VHOST_MAX_PEND) % UIO_MAXIOV == nvq->done_idx; }

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Jason (Hui) Wang53100.00%1100.00%
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/* Expects to be always run from workqueue - which acts as * read-size critical section for our kind of RCU. */
static void handle_tx(struct vhost_net *net) { struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; struct vhost_virtqueue *vq = &nvq->vq; unsigned out, in; int head; struct msghdr msg = { .msg_name = NULL, .msg_namelen = 0, .msg_control = NULL, .msg_controllen = 0, .msg_flags = MSG_DONTWAIT, }; size_t len, total_len = 0; int err; size_t hdr_size; struct socket *sock; struct vhost_net_ubuf_ref *uninitialized_var(ubufs); bool zcopy, zcopy_used; mutex_lock(&vq->mutex); sock = vq->private_data; if (!sock) goto out; if (!vq_iotlb_prefetch(vq)) goto out; vhost_disable_notify(&net->dev, vq); hdr_size = nvq->vhost_hlen; zcopy = nvq->ubufs; for (;;) { /* Release DMAs done buffers first */ if (zcopy) vhost_zerocopy_signal_used(net, vq); /* If more outstanding DMAs, queue the work. * Handle upend_idx wrap around */ if (unlikely(vhost_exceeds_maxpend(net))) break; head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, ARRAY_SIZE(vq->iov), &out, &in); /* On error, stop handling until the next kick. */ if (unlikely(head < 0)) break; /* Nothing new? Wait for eventfd to tell us they refilled. */ if (head == vq->num) { if (unlikely(vhost_enable_notify(&net->dev, vq))) { vhost_disable_notify(&net->dev, vq); continue; } break; } if (in) { vq_err(vq, "Unexpected descriptor format for TX: " "out %d, int %d\n", out, in); break; } /* Skip header. TODO: support TSO. */ len = iov_length(vq->iov, out); iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); iov_iter_advance(&msg.msg_iter, hdr_size); /* Sanity check */ if (!msg_data_left(&msg)) { vq_err(vq, "Unexpected header len for TX: " "%zd expected %zd\n", len, hdr_size); break; } len = msg_data_left(&msg); zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN && (nvq->upend_idx + 1) % UIO_MAXIOV != nvq->done_idx && vhost_net_tx_select_zcopy(net); /* use msg_control to pass vhost zerocopy ubuf info to skb */ if (zcopy_used) { struct ubuf_info *ubuf; ubuf = nvq->ubuf_info + nvq->upend_idx; vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; ubuf->callback = vhost_zerocopy_callback; ubuf->ctx = nvq->ubufs; ubuf->desc = nvq->upend_idx; refcount_set(&ubuf->refcnt, 1); msg.msg_control = ubuf; msg.msg_controllen = sizeof(ubuf); ubufs = nvq->ubufs; atomic_inc(&ubufs->refcount); nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; } else { msg.msg_control = NULL; ubufs = NULL; } total_len += len; if (total_len < VHOST_NET_WEIGHT && !vhost_vq_avail_empty(&net->dev, vq) && likely(!vhost_exceeds_maxpend(net))) { msg.msg_flags |= MSG_MORE; } else { msg.msg_flags &= ~MSG_MORE; } /* TODO: Check specific error and bomb out unless ENOBUFS? */ err = sock->ops->sendmsg(sock, &msg, len); if (unlikely(err < 0)) { if (zcopy_used) { vhost_net_ubuf_put(ubufs); nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) % UIO_MAXIOV; } vhost_discard_vq_desc(vq, 1); break; } if (err != len) pr_debug("Truncated TX packet: " " len %d != %zd\n", err, len); if (!zcopy_used) vhost_add_used_and_signal(&net->dev, vq, head, 0); else vhost_zerocopy_signal_used(net, vq); vhost_net_tx_packet(net); if (unlikely(total_len >= VHOST_NET_WEIGHT)) { vhost_poll_queue(&vq->poll); break; } } out: mutex_unlock(&vq->mutex); }

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Michael S. Tsirkin50570.43%1443.75%
Jason (Hui) Wang11916.60%825.00%
Al Viro425.86%39.38%
Asias He344.74%39.38%
Willem de Bruijn91.26%13.12%
Arnd Bergmann40.56%13.12%
David L Stevens30.42%13.12%
Eric Dumazet10.14%13.12%
Total717100.00%32100.00%


static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) { struct sk_buff *head; int len = 0; unsigned long flags; if (rvq->rx_array) return vhost_net_buf_peek(rvq); spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); head = skb_peek(&sk->sk_receive_queue); if (likely(head)) { len = head->len; if (skb_vlan_tag_present(head)) len += VLAN_HLEN; } spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); return len; }

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Jason (Hui) Wang4038.10%337.50%
Michael S. Tsirkin2927.62%225.00%
David L Stevens2321.90%112.50%
Basil Gor1211.43%112.50%
Jiri Pirko10.95%112.50%
Total105100.00%8100.00%


static int sk_has_rx_data(struct sock *sk) { struct socket *sock = sk->sk_socket; if (sock->ops->peek_len) return sock->ops->peek_len(sock); return skb_queue_empty(&sk->sk_receive_queue); }

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Jason (Hui) Wang47100.00%1100.00%
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static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) { struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; struct vhost_virtqueue *vq = &nvq->vq; unsigned long uninitialized_var(endtime); int len = peek_head_len(rvq, sk); if (!len && vq->busyloop_timeout) { /* Both tx vq and rx socket were polled here */ mutex_lock(&vq->mutex); vhost_disable_notify(&net->dev, vq); preempt_disable(); endtime = busy_clock() + vq->busyloop_timeout; while (vhost_can_busy_poll(&net->dev, endtime) && !sk_has_rx_data(sk) && vhost_vq_avail_empty(&net->dev, vq)) cpu_relax(); preempt_enable(); if (!vhost_vq_avail_empty(&net->dev, vq)) vhost_poll_queue(&vq->poll); else if (unlikely(vhost_enable_notify(&net->dev, vq))) { vhost_disable_notify(&net->dev, vq); vhost_poll_queue(&vq->poll); } mutex_unlock(&vq->mutex); len = peek_head_len(rvq, sk); } return len; }

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Jason (Hui) Wang22199.55%480.00%
Christian Bornträger10.45%120.00%
Total222100.00%5100.00%

/* This is a multi-buffer version of vhost_get_desc, that works if * vq has read descriptors only. * @vq - the relevant virtqueue * @datalen - data length we'll be reading * @iovcount - returned count of io vectors we fill * @log - vhost log * @log_num - log offset * @quota - headcount quota, 1 for big buffer * returns number of buffer heads allocated, negative on error */
static int get_rx_bufs(struct vhost_virtqueue *vq, struct vring_used_elem *heads, int datalen, unsigned *iovcount, struct vhost_log *log, unsigned *log_num, unsigned int quota) { unsigned int out, in; int seg = 0; int headcount = 0; unsigned d; int r, nlogs = 0; /* len is always initialized before use since we are always called with * datalen > 0. */ u32 uninitialized_var(len); while (datalen > 0 && headcount < quota) { if (unlikely(seg >= UIO_MAXIOV)) { r = -ENOBUFS; goto err; } r = vhost_get_vq_desc(vq, vq->iov + seg, ARRAY_SIZE(vq->iov) - seg, &out, &in, log, log_num); if (unlikely(r < 0)) goto err; d = r; if (d == vq->num) { r = 0; goto err; } if (unlikely(out || in <= 0)) { vq_err(vq, "unexpected descriptor format for RX: " "out %d, in %d\n", out, in); r = -EINVAL; goto err; } if (unlikely(log)) { nlogs += *log_num; log += *log_num; } heads[headcount].id = cpu_to_vhost32(vq, d); len = iov_length(vq->iov + seg, in); heads[headcount].len = cpu_to_vhost32(vq, len); datalen -= len; ++headcount; seg += in; } heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); *iovcount = seg; if (unlikely(log)) *log_num = nlogs; /* Detect overrun */ if (unlikely(datalen > 0)) { r = UIO_MAXIOV + 1; goto err; } return headcount; err: vhost_discard_vq_desc(vq, headcount); return r; }

Contributors

PersonTokensPropCommitsCommitProp
Jason (Hui) Wang14943.82%222.22%
David L Stevens11935.00%111.11%
Michael S. Tsirkin7221.18%666.67%
Total340100.00%9100.00%

/* Expects to be always run from workqueue - which acts as * read-size critical section for our kind of RCU. */
static void handle_rx(struct vhost_net *net) { struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; struct vhost_virtqueue *vq = &nvq->vq; unsigned uninitialized_var(in), log; struct vhost_log *vq_log; struct msghdr msg = { .msg_name = NULL, .msg_namelen = 0, .msg_control = NULL, /* FIXME: get and handle RX aux data. */ .msg_controllen = 0, .msg_flags = MSG_DONTWAIT, }; struct virtio_net_hdr hdr = { .flags = 0, .gso_type = VIRTIO_NET_HDR_GSO_NONE }; size_t total_len = 0; int err, mergeable; s16 headcount; size_t vhost_hlen, sock_hlen; size_t vhost_len, sock_len; struct socket *sock; struct iov_iter fixup; __virtio16 num_buffers; mutex_lock(&vq->mutex); sock = vq->private_data; if (!sock) goto out; if (!vq_iotlb_prefetch(vq)) goto out; vhost_disable_notify(&net->dev, vq); vhost_net_disable_vq(net, vq); vhost_hlen = nvq->vhost_hlen; sock_hlen = nvq->sock_hlen; vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? vq->log : NULL; mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { sock_len += sock_hlen; vhost_len = sock_len + vhost_hlen; headcount = get_rx_bufs(vq, vq->heads, vhost_len, &in, vq_log, &log, likely(mergeable) ? UIO_MAXIOV : 1); /* On error, stop handling until the next kick. */ if (unlikely(headcount < 0)) goto out; if (nvq->rx_array) msg.msg_control = vhost_net_buf_consume(&nvq->rxq); /* On overrun, truncate and discard */ if (unlikely(headcount > UIO_MAXIOV)) { iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); err = sock->ops->recvmsg(sock, &msg, 1, MSG_DONTWAIT | MSG_TRUNC); pr_debug("Discarded rx packet: len %zd\n", sock_len); continue; } /* OK, now we need to know about added descriptors. */ if (!headcount) { if (unlikely(vhost_enable_notify(&net->dev, vq))) { /* They have slipped one in as we were * doing that: check again. */ vhost_disable_notify(&net->dev, vq); continue; } /* Nothing new? Wait for eventfd to tell us * they refilled. */ goto out; } /* We don't need to be notified again. */ iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); fixup = msg.msg_iter; if (unlikely((vhost_hlen))) { /* We will supply the header ourselves * TODO: support TSO. */ iov_iter_advance(&msg.msg_iter, vhost_hlen); } err = sock->ops->recvmsg(sock, &msg, sock_len, MSG_DONTWAIT | MSG_TRUNC); /* Userspace might have consumed the packet meanwhile: * it's not supposed to do this usually, but might be hard * to prevent. Discard data we got (if any) and keep going. */ if (unlikely(err != sock_len)) { pr_debug("Discarded rx packet: " " len %d, expected %zd\n", err, sock_len); vhost_discard_vq_desc(vq, headcount); continue; } /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ if (unlikely(vhost_hlen)) { if (copy_to_iter(&hdr, sizeof(hdr), &fixup) != sizeof(hdr)) { vq_err(vq, "Unable to write vnet_hdr " "at addr %p\n", vq->iov->iov_base); goto out; } } else { /* Header came from socket; we'll need to patch * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF */ iov_iter_advance(&fixup, sizeof(hdr)); } /* TODO: Should check and handle checksum. */ num_buffers = cpu_to_vhost16(vq, headcount); if (likely(mergeable) && copy_to_iter(&num_buffers, sizeof num_buffers, &fixup) != sizeof num_buffers) { vq_err(vq, "Failed num_buffers write"); vhost_discard_vq_desc(vq, headcount); goto out; } vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, headcount); if (unlikely(vq_log)) vhost_log_write(vq, vq_log, log, vhost_len); total_len += vhost_len; if (unlikely(total_len >= VHOST_NET_WEIGHT)) { vhost_poll_queue(&vq->poll); goto out; } } vhost_net_enable_vq(net, vq); out: mutex_unlock(&vq->mutex); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin33147.56%1250.00%
David L Stevens19528.02%14.17%
Jason (Hui) Wang8612.36%729.17%
Al Viro679.63%28.33%
Asias He172.44%28.33%
Total696100.00%24100.00%


static void handle_tx_kick(struct vhost_work *work) { struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, poll.work); struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); handle_tx(net); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin4284.00%150.00%
Tejun Heo816.00%150.00%
Total50100.00%2100.00%


static void handle_rx_kick(struct vhost_work *work) { struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, poll.work); struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); handle_rx(net); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin4284.00%150.00%
Tejun Heo816.00%150.00%
Total50100.00%2100.00%


static void handle_tx_net(struct vhost_work *work) { struct vhost_net *net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_TX].work); handle_tx(net); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin3391.67%150.00%
Tejun Heo38.33%150.00%
Total36100.00%2100.00%


static void handle_rx_net(struct vhost_work *work) { struct vhost_net *net = container_of(work, struct vhost_net, poll[VHOST_NET_VQ_RX].work); handle_rx(net); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin3391.67%150.00%
Tejun Heo38.33%150.00%
Total36100.00%2100.00%


static int vhost_net_open(struct inode *inode, struct file *f) { struct vhost_net *n; struct vhost_dev *dev; struct vhost_virtqueue **vqs; struct sk_buff **queue; int i; n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); if (!n) return -ENOMEM; vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); if (!vqs) { kvfree(n); return -ENOMEM; } queue = kmalloc_array(VHOST_RX_BATCH, sizeof(struct sk_buff *), GFP_KERNEL); if (!queue) { kfree(vqs); kvfree(n); return -ENOMEM; } n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; dev = &n->dev; vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; for (i = 0; i < VHOST_NET_VQ_MAX; i++) { n->vqs[i].ubufs = NULL; n->vqs[i].ubuf_info = NULL; n->vqs[i].upend_idx = 0; n->vqs[i].done_idx = 0; n->vqs[i].vhost_hlen = 0; n->vqs[i].sock_hlen = 0; vhost_net_buf_init(&n->vqs[i].rxq); } vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); f->private_data = n; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin13137.54%330.00%
Asias He13037.25%220.00%
Jason (Hui) Wang6919.77%110.00%
Tejun Heo164.58%110.00%
Michal Hocko20.57%220.00%
Romain Francoise10.29%110.00%
Total349100.00%10100.00%


static struct socket *vhost_net_stop_vq(struct vhost_net *n, struct vhost_virtqueue *vq) { struct socket *sock; struct vhost_net_virtqueue *nvq = container_of(vq, struct vhost_net_virtqueue, vq); mutex_lock(&vq->mutex); sock = vq->private_data; vhost_net_disable_vq(n, vq); vq->private_data = NULL; vhost_net_buf_unproduce(nvq); mutex_unlock(&vq->mutex); return sock; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin6074.07%133.33%
Jason (Hui) Wang2024.69%133.33%
Asias He11.23%133.33%
Total81100.00%3100.00%


static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, struct socket **rx_sock) { *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin4983.05%150.00%
Asias He1016.95%150.00%
Total59100.00%2100.00%


static void vhost_net_flush_vq(struct vhost_net *n, int index) { vhost_poll_flush(n->poll + index); vhost_poll_flush(&n->vqs[index].vq.poll); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin3694.74%150.00%
Asias He25.26%150.00%
Total38100.00%2100.00%


static void vhost_net_flush(struct vhost_net *n) { vhost_net_flush_vq(n, VHOST_NET_VQ_TX); vhost_net_flush_vq(n, VHOST_NET_VQ_RX); if (n->vqs[VHOST_NET_VQ_TX].ubufs) { mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); n->tx_flush = true; mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); /* Wait for all lower device DMAs done. */ vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); n->tx_flush = false; atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); } }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin13193.57%360.00%
Asias He96.43%240.00%
Total140100.00%5100.00%


static int vhost_net_release(struct inode *inode, struct file *f) { struct vhost_net *n = f->private_data; struct socket *tx_sock; struct socket *rx_sock; vhost_net_stop(n, &tx_sock, &rx_sock); vhost_net_flush(n); vhost_dev_stop(&n->dev); vhost_dev_cleanup(&n->dev, false); vhost_net_vq_reset(n); if (tx_sock) sockfd_put(tx_sock); if (rx_sock) sockfd_put(rx_sock); /* Make sure no callbacks are outstanding */ synchronize_rcu_bh(); /* We do an extra flush before freeing memory, * since jobs can re-queue themselves. */ vhost_net_flush(n); kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); kfree(n->dev.vqs); kvfree(n); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin10478.20%550.00%
Jason (Hui) Wang1410.53%110.00%
Asias He129.02%220.00%
Al Viro21.50%110.00%
Romain Francoise10.75%110.00%
Total133100.00%10100.00%


static struct socket *get_raw_socket(int fd) { struct { struct sockaddr_ll sa; char buf[MAX_ADDR_LEN]; } uaddr; int uaddr_len = sizeof uaddr, r; struct socket *sock = sockfd_lookup(fd, &r); if (!sock) return ERR_PTR(-ENOTSOCK); /* Parameter checking */ if (sock->sk->sk_type != SOCK_RAW) { r = -ESOCKTNOSUPPORT; goto err; } r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, &uaddr_len, 0); if (r) goto err; if (uaddr.sa.sll_family != AF_PACKET) { r = -EPFNOSUPPORT; goto err; } return sock; err: sockfd_put(sock); return ERR_PTR(r); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin14899.33%150.00%
Al Viro10.67%150.00%
Total149100.00%2100.00%


static struct skb_array *get_tap_skb_array(int fd) { struct skb_array *array; struct file *file = fget(fd); if (!file) return NULL; array = tun_get_skb_array(file); if (!IS_ERR(array)) goto out; array = tap_get_skb_array(file); if (!IS_ERR(array)) goto out; array = NULL; out: fput(file); return array; }

Contributors

PersonTokensPropCommitsCommitProp
Jason (Hui) Wang84100.00%1100.00%
Total84100.00%1100.00%


static struct socket *get_tap_socket(int fd) { struct file *file = fget(fd); struct socket *sock; if (!file) return ERR_PTR(-EBADF); sock = tun_get_socket(file); if (!IS_ERR(sock)) return sock; sock = tap_get_socket(file); if (IS_ERR(sock)) fput(file); return sock; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin5975.64%133.33%
Arnd Bergmann1823.08%133.33%
Sainath Grandhi11.28%133.33%
Total78100.00%3100.00%


static struct socket *get_socket(int fd) { struct socket *sock; /* special case to disable backend */ if (fd == -1) return NULL; sock = get_raw_socket(fd); if (!IS_ERR(sock)) return sock; sock = get_tap_socket(fd); if (!IS_ERR(sock)) return sock; return ERR_PTR(-ENOTSOCK); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin6998.57%150.00%
Arnd Bergmann11.43%150.00%
Total70100.00%2100.00%


static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) { struct socket *sock, *oldsock; struct vhost_virtqueue *vq; struct vhost_net_virtqueue *nvq; struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; int r; mutex_lock(&n->dev.mutex); r = vhost_dev_check_owner(&n->dev); if (r) goto err; if (index >= VHOST_NET_VQ_MAX) { r = -ENOBUFS; goto err; } vq = &n->vqs[index].vq; nvq = &n->vqs[index]; mutex_lock(&vq->mutex); /* Verify that ring has been setup correctly. */ if (!vhost_vq_access_ok(vq)) { r = -EFAULT; goto err_vq; } sock = get_socket(fd); if (IS_ERR(sock)) { r = PTR_ERR(sock); goto err_vq; } /* start polling new socket */ oldsock = vq->private_data; if (sock != oldsock) { ubufs = vhost_net_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock)); if (IS_ERR(ubufs)) { r = PTR_ERR(ubufs); goto err_ubufs; } vhost_net_disable_vq(n, vq); vq->private_data = sock; vhost_net_buf_unproduce(nvq); if (index == VHOST_NET_VQ_RX) nvq->rx_array = get_tap_skb_array(fd); r = vhost_vq_init_access(vq); if (r) goto err_used; r = vhost_net_enable_vq(n, vq); if (r) goto err_used; oldubufs = nvq->ubufs; nvq->ubufs = ubufs; n->tx_packets = 0; n->tx_zcopy_err = 0; n->tx_flush = false; } mutex_unlock(&vq->mutex); if (oldubufs) { vhost_net_ubuf_put_wait_and_free(oldubufs); mutex_lock(&vq->mutex); vhost_zerocopy_signal_used(n, vq); mutex_unlock(&vq->mutex); } if (oldsock) { vhost_net_flush_vq(n, index); sockfd_put(oldsock); } mutex_unlock(&n->dev.mutex); return 0; err_used: vq->private_data = oldsock; vhost_net_enable_vq(n, vq); if (ubufs) vhost_net_ubuf_put_wait_and_free(ubufs); err_ubufs: sockfd_put(sock); err_vq: mutex_unlock(&vq->mutex); err: mutex_unlock(&n->dev.mutex); return r; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin31171.33%840.00%
Jason (Hui) Wang8118.58%420.00%
Asias He265.96%420.00%
Jeff Dike153.44%210.00%
Al Viro20.46%15.00%
Greg Kurz10.23%15.00%
Total436100.00%20100.00%


static long vhost_net_reset_owner(struct vhost_net *n) { struct socket *tx_sock = NULL; struct socket *rx_sock = NULL; long err; struct vhost_umem *umem; mutex_lock(&n->dev.mutex); err = vhost_dev_check_owner(&n->dev); if (err) goto done; umem = vhost_dev_reset_owner_prepare(); if (!umem) { err = -ENOMEM; goto done; } vhost_net_stop(n, &tx_sock, &rx_sock); vhost_net_flush(n); vhost_dev_reset_owner(&n->dev, umem); vhost_net_vq_reset(n); done: mutex_unlock(&n->dev.mutex); if (tx_sock) sockfd_put(tx_sock); if (rx_sock) sockfd_put(rx_sock); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin13392.36%350.00%
Jason (Hui) Wang53.47%116.67%
Asias He42.78%116.67%
Al Viro21.39%116.67%
Total144100.00%6100.00%


static int vhost_net_set_features(struct vhost_net *n, u64 features) { size_t vhost_hlen, sock_hlen, hdr_len; int i; hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) ? sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { /* vhost provides vnet_hdr */ vhost_hlen = hdr_len; sock_hlen = 0; } else { /* socket provides vnet_hdr */ vhost_hlen = 0; sock_hlen = hdr_len; } mutex_lock(&n->dev.mutex); if ((features & (1 << VHOST_F_LOG_ALL)) && !vhost_log_access_ok(&n->dev)) goto out_unlock; if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { if (vhost_init_device_iotlb(&n->dev, true)) goto out_unlock; } for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { mutex_lock(&n->vqs[i].vq.mutex); n->vqs[i].vq.acked_features = features; n->vqs[i].vhost_hlen = vhost_hlen; n->vqs[i].sock_hlen = sock_hlen; mutex_unlock(&n->vqs[i].vq.mutex); } mutex_unlock(&n->dev.mutex); return 0; out_unlock: mutex_unlock(&n->dev.mutex); return -EFAULT; }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin15157.85%350.00%
David L Stevens6625.29%116.67%
Jason (Hui) Wang4015.33%116.67%
Asias He41.53%116.67%
Total261100.00%6100.00%


static long vhost_net_set_owner(struct vhost_net *n) { int r; mutex_lock(&n->dev.mutex); if (vhost_dev_has_owner(&n->dev)) { r = -EBUSY; goto out; } r = vhost_net_set_ubuf_info(n); if (r) goto out; r = vhost_dev_set_owner(&n->dev); if (r) vhost_net_clear_ubuf_info(n); vhost_net_flush(n); out: mutex_unlock(&n->dev.mutex); return r; }

Contributors

PersonTokensPropCommitsCommitProp
Asias He7779.38%150.00%
Michael S. Tsirkin2020.62%150.00%
Total97100.00%2100.00%


static long vhost_net_ioctl(struct file *f, unsigned int ioctl, unsigned long arg) { struct vhost_net *n = f->private_data; void __user *argp = (void __user *)arg; u64 __user *featurep = argp; struct vhost_vring_file backend; u64 features; int r; switch (ioctl) { case VHOST_NET_SET_BACKEND: if (copy_from_user(&backend, argp, sizeof backend)) return -EFAULT; return vhost_net_set_backend(n, backend.index, backend.fd); case VHOST_GET_FEATURES: features = VHOST_NET_FEATURES; if (copy_to_user(featurep, &features, sizeof features)) return -EFAULT; return 0; case VHOST_SET_FEATURES: if (copy_from_user(&features, featurep, sizeof features)) return -EFAULT; if (features & ~VHOST_NET_FEATURES) return -EOPNOTSUPP; return vhost_net_set_features(n, features); case VHOST_RESET_OWNER: return vhost_net_reset_owner(n); case VHOST_SET_OWNER: return vhost_net_set_owner(n); default: mutex_lock(&n->dev.mutex); r = vhost_dev_ioctl(&n->dev, ioctl, argp); if (r == -ENOIOCTLCMD) r = vhost_vring_ioctl(&n->dev, ioctl, argp); else vhost_net_flush(n); mutex_unlock(&n->dev.mutex); return r; } }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin21888.62%240.00%
Takuya Yoshikawa176.91%120.00%
Asias He93.66%120.00%
Stefan Hajnoczi20.81%120.00%
Total246100.00%5100.00%

#ifdef CONFIG_COMPAT
static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, unsigned long arg) { return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin36100.00%1100.00%
Total36100.00%1100.00%

#endif
static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct file *file = iocb->ki_filp; struct vhost_net *n = file->private_data; struct vhost_dev *dev = &n->dev; int noblock = file->f_flags & O_NONBLOCK; return vhost_chr_read_iter(dev, to, noblock); }

Contributors

PersonTokensPropCommitsCommitProp
Jason (Hui) Wang63100.00%1100.00%
Total63100.00%1100.00%


static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct vhost_net *n = file->private_data; struct vhost_dev *dev = &n->dev; return vhost_chr_write_iter(dev, from); }

Contributors

PersonTokensPropCommitsCommitProp
Jason (Hui) Wang52100.00%1100.00%
Total52100.00%1100.00%


static unsigned int vhost_net_chr_poll(struct file *file, poll_table *wait) { struct vhost_net *n = file->private_data; struct vhost_dev *dev = &n->dev; return vhost_chr_poll(file, dev, wait); }

Contributors

PersonTokensPropCommitsCommitProp
Jason (Hui) Wang45100.00%1100.00%
Total45100.00%1100.00%

static const struct file_operations vhost_net_fops = { .owner = THIS_MODULE, .release = vhost_net_release, .read_iter = vhost_net_chr_read_iter, .write_iter = vhost_net_chr_write_iter, .poll = vhost_net_chr_poll, .unlocked_ioctl = vhost_net_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = vhost_net_compat_ioctl, #endif .open = vhost_net_open, .llseek = noop_llseek, }; static struct miscdevice vhost_net_misc = { .minor = VHOST_NET_MINOR, .name = "vhost-net", .fops = &vhost_net_fops, };
static int vhost_net_init(void) { if (experimental_zcopytx) vhost_net_enable_zcopy(VHOST_NET_VQ_TX); return misc_register(&vhost_net_misc); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin2187.50%240.00%
Asias He14.17%120.00%
Christoph Hellwig14.17%120.00%
Tejun Heo14.17%120.00%
Total24100.00%5100.00%

module_init(vhost_net_init);
static void vhost_net_exit(void) { misc_deregister(&vhost_net_misc); }

Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin1392.86%150.00%
Christoph Hellwig17.14%150.00%
Total14100.00%2100.00%

module_exit(vhost_net_exit); MODULE_VERSION("0.0.1"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Michael S. Tsirkin"); MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); MODULE_ALIAS("devname:vhost-net");

Overall Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin339049.45%4139.81%
Jason (Hui) Wang197428.79%2423.30%
Asias He79611.61%87.77%
David L Stevens4075.94%10.97%
Al Viro1161.69%54.85%
Tejun Heo420.61%21.94%
Arnd Bergmann310.45%32.91%
Stephen Hemminger200.29%10.97%
Takuya Yoshikawa170.25%10.97%
Basil Gor150.22%10.97%
Jeff Dike150.22%21.94%
Willem de Bruijn90.13%10.97%
Ingo Molnar60.09%21.94%
Sainath Grandhi40.06%10.97%
Christian Bornträger20.03%10.97%
Michal Hocko20.03%21.94%
Romain Francoise20.03%10.97%
Christoph Hellwig20.03%10.97%
Stefan Hajnoczi20.03%10.97%
Greg Kurz10.01%10.97%
Tobias Klauser10.01%10.97%
Jiri Pirko10.01%10.97%
Eric Dumazet10.01%10.97%
Total6856100.00%103100.00%
Directory: drivers/vhost
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