mirror of https://gitee.com/openkylin/linux.git
668 lines
17 KiB
C
668 lines
17 KiB
C
/* A simple network driver using virtio.
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*
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* Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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//#define DEBUG
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/virtio.h>
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#include <linux/virtio_net.h>
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#include <linux/scatterlist.h>
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static int napi_weight = 128;
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module_param(napi_weight, int, 0444);
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static int csum = 1, gso = 1;
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module_param(csum, bool, 0444);
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module_param(gso, bool, 0444);
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/* FIXME: MTU in config. */
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#define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN)
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struct virtnet_info
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{
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struct virtio_device *vdev;
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struct virtqueue *rvq, *svq;
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struct net_device *dev;
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struct napi_struct napi;
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/* The skb we couldn't send because buffers were full. */
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struct sk_buff *last_xmit_skb;
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/* If we need to free in a timer, this is it. */
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struct timer_list xmit_free_timer;
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/* Number of input buffers, and max we've ever had. */
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unsigned int num, max;
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/* For cleaning up after transmission. */
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struct tasklet_struct tasklet;
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bool free_in_tasklet;
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/* I like... big packets and I cannot lie! */
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bool big_packets;
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/* Receive & send queues. */
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struct sk_buff_head recv;
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struct sk_buff_head send;
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/* Chain pages by the private ptr. */
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struct page *pages;
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};
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static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb)
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{
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return (struct virtio_net_hdr *)skb->cb;
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}
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static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb)
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{
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sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr));
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}
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static void give_a_page(struct virtnet_info *vi, struct page *page)
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{
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page->private = (unsigned long)vi->pages;
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vi->pages = page;
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}
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static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
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{
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struct page *p = vi->pages;
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if (p)
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vi->pages = (struct page *)p->private;
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else
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p = alloc_page(gfp_mask);
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return p;
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}
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static void skb_xmit_done(struct virtqueue *svq)
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{
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struct virtnet_info *vi = svq->vdev->priv;
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/* Suppress further interrupts. */
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svq->vq_ops->disable_cb(svq);
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/* We were probably waiting for more output buffers. */
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netif_wake_queue(vi->dev);
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/* Make sure we re-xmit last_xmit_skb: if there are no more packets
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* queued, start_xmit won't be called. */
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tasklet_schedule(&vi->tasklet);
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}
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static void receive_skb(struct net_device *dev, struct sk_buff *skb,
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unsigned len)
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{
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struct virtio_net_hdr *hdr = skb_vnet_hdr(skb);
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int err;
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if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
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pr_debug("%s: short packet %i\n", dev->name, len);
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dev->stats.rx_length_errors++;
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goto drop;
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}
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len -= sizeof(struct virtio_net_hdr);
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if (len <= MAX_PACKET_LEN) {
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unsigned int i;
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
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give_a_page(dev->priv, skb_shinfo(skb)->frags[i].page);
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skb->data_len = 0;
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skb_shinfo(skb)->nr_frags = 0;
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}
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err = pskb_trim(skb, len);
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if (err) {
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pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err);
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dev->stats.rx_dropped++;
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goto drop;
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}
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skb->truesize += skb->data_len;
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
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pr_debug("Needs csum!\n");
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if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset))
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goto frame_err;
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}
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skb->protocol = eth_type_trans(skb, dev);
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pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
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ntohs(skb->protocol), skb->len, skb->pkt_type);
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if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
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pr_debug("GSO!\n");
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switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
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case VIRTIO_NET_HDR_GSO_TCPV4:
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skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
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break;
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case VIRTIO_NET_HDR_GSO_UDP:
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skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
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break;
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case VIRTIO_NET_HDR_GSO_TCPV6:
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skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
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break;
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default:
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if (net_ratelimit())
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printk(KERN_WARNING "%s: bad gso type %u.\n",
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dev->name, hdr->gso_type);
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goto frame_err;
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}
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if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
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skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
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skb_shinfo(skb)->gso_size = hdr->gso_size;
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if (skb_shinfo(skb)->gso_size == 0) {
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if (net_ratelimit())
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printk(KERN_WARNING "%s: zero gso size.\n",
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dev->name);
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goto frame_err;
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}
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/* Header must be checked, and gso_segs computed. */
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skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
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skb_shinfo(skb)->gso_segs = 0;
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}
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netif_receive_skb(skb);
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return;
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frame_err:
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dev->stats.rx_frame_errors++;
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drop:
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dev_kfree_skb(skb);
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}
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static void try_fill_recv(struct virtnet_info *vi)
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{
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struct sk_buff *skb;
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struct scatterlist sg[2+MAX_SKB_FRAGS];
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int num, err, i;
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sg_init_table(sg, 2+MAX_SKB_FRAGS);
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for (;;) {
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skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN);
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if (unlikely(!skb))
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break;
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skb_put(skb, MAX_PACKET_LEN);
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vnet_hdr_to_sg(sg, skb);
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if (vi->big_packets) {
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for (i = 0; i < MAX_SKB_FRAGS; i++) {
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skb_frag_t *f = &skb_shinfo(skb)->frags[i];
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f->page = get_a_page(vi, GFP_ATOMIC);
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if (!f->page)
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break;
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f->page_offset = 0;
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f->size = PAGE_SIZE;
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skb->data_len += PAGE_SIZE;
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skb->len += PAGE_SIZE;
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skb_shinfo(skb)->nr_frags++;
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}
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}
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num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
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skb_queue_head(&vi->recv, skb);
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err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
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if (err) {
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skb_unlink(skb, &vi->recv);
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kfree_skb(skb);
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break;
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}
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vi->num++;
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}
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if (unlikely(vi->num > vi->max))
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vi->max = vi->num;
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vi->rvq->vq_ops->kick(vi->rvq);
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}
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static void skb_recv_done(struct virtqueue *rvq)
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{
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struct virtnet_info *vi = rvq->vdev->priv;
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/* Schedule NAPI, Suppress further interrupts if successful. */
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if (netif_rx_schedule_prep(vi->dev, &vi->napi)) {
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rvq->vq_ops->disable_cb(rvq);
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__netif_rx_schedule(vi->dev, &vi->napi);
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}
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}
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static int virtnet_poll(struct napi_struct *napi, int budget)
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{
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struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
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struct sk_buff *skb = NULL;
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unsigned int len, received = 0;
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again:
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while (received < budget &&
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(skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) {
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__skb_unlink(skb, &vi->recv);
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receive_skb(vi->dev, skb, len);
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vi->num--;
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received++;
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}
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/* FIXME: If we oom and completely run out of inbufs, we need
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* to start a timer trying to fill more. */
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if (vi->num < vi->max / 2)
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try_fill_recv(vi);
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/* Out of packets? */
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if (received < budget) {
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netif_rx_complete(vi->dev, napi);
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if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
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&& napi_schedule_prep(napi)) {
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vi->rvq->vq_ops->disable_cb(vi->rvq);
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__netif_rx_schedule(vi->dev, napi);
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goto again;
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}
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}
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return received;
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}
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static void free_old_xmit_skbs(struct virtnet_info *vi)
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{
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struct sk_buff *skb;
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unsigned int len;
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while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) {
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pr_debug("Sent skb %p\n", skb);
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__skb_unlink(skb, &vi->send);
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vi->dev->stats.tx_bytes += skb->len;
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vi->dev->stats.tx_packets++;
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kfree_skb(skb);
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}
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}
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/* If the virtio transport doesn't always notify us when all in-flight packets
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* are consumed, we fall back to using this function on a timer to free them. */
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static void xmit_free(unsigned long data)
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{
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struct virtnet_info *vi = (void *)data;
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netif_tx_lock(vi->dev);
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free_old_xmit_skbs(vi);
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if (!skb_queue_empty(&vi->send))
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mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
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netif_tx_unlock(vi->dev);
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}
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static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
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{
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int num, err;
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struct scatterlist sg[2+MAX_SKB_FRAGS];
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struct virtio_net_hdr *hdr;
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const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
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sg_init_table(sg, 2+MAX_SKB_FRAGS);
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pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
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/* Encode metadata header at front. */
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hdr = skb_vnet_hdr(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
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hdr->csum_start = skb->csum_start - skb_headroom(skb);
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hdr->csum_offset = skb->csum_offset;
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} else {
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hdr->flags = 0;
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hdr->csum_offset = hdr->csum_start = 0;
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}
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if (skb_is_gso(skb)) {
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hdr->hdr_len = skb_transport_header(skb) - skb->data;
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hdr->gso_size = skb_shinfo(skb)->gso_size;
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if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
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else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
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else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
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hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
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else
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BUG();
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if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
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hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
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} else {
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
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hdr->gso_size = hdr->hdr_len = 0;
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}
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vnet_hdr_to_sg(sg, skb);
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num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
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err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
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if (!err && !vi->free_in_tasklet)
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mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10));
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return err;
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}
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static void xmit_tasklet(unsigned long data)
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{
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struct virtnet_info *vi = (void *)data;
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netif_tx_lock_bh(vi->dev);
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if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) {
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vi->svq->vq_ops->kick(vi->svq);
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vi->last_xmit_skb = NULL;
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}
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if (vi->free_in_tasklet)
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free_old_xmit_skbs(vi);
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netif_tx_unlock_bh(vi->dev);
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}
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static int start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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again:
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/* Free up any pending old buffers before queueing new ones. */
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free_old_xmit_skbs(vi);
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/* If we has a buffer left over from last time, send it now. */
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if (unlikely(vi->last_xmit_skb) &&
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xmit_skb(vi, vi->last_xmit_skb) != 0)
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goto stop_queue;
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vi->last_xmit_skb = NULL;
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/* Put new one in send queue and do transmit */
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if (likely(skb)) {
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__skb_queue_head(&vi->send, skb);
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if (xmit_skb(vi, skb) != 0) {
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vi->last_xmit_skb = skb;
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skb = NULL;
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goto stop_queue;
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}
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}
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done:
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vi->svq->vq_ops->kick(vi->svq);
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return NETDEV_TX_OK;
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stop_queue:
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pr_debug("%s: virtio not prepared to send\n", dev->name);
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netif_stop_queue(dev);
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/* Activate callback for using skbs: if this returns false it
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* means some were used in the meantime. */
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if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
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vi->svq->vq_ops->disable_cb(vi->svq);
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netif_start_queue(dev);
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goto again;
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}
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if (skb) {
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/* Drop this skb: we only queue one. */
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vi->dev->stats.tx_dropped++;
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kfree_skb(skb);
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}
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goto done;
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void virtnet_netpoll(struct net_device *dev)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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napi_schedule(&vi->napi);
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}
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#endif
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static int virtnet_open(struct net_device *dev)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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napi_enable(&vi->napi);
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/* If all buffers were filled by other side before we napi_enabled, we
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* won't get another interrupt, so process any outstanding packets
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* now. virtnet_poll wants re-enable the queue, so we disable here.
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* We synchronize against interrupts via NAPI_STATE_SCHED */
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if (netif_rx_schedule_prep(dev, &vi->napi)) {
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vi->rvq->vq_ops->disable_cb(vi->rvq);
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__netif_rx_schedule(dev, &vi->napi);
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}
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return 0;
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}
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static int virtnet_close(struct net_device *dev)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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napi_disable(&vi->napi);
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return 0;
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}
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static int virtnet_set_tx_csum(struct net_device *dev, u32 data)
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{
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struct virtnet_info *vi = netdev_priv(dev);
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struct virtio_device *vdev = vi->vdev;
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if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM))
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return -ENOSYS;
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return ethtool_op_set_tx_hw_csum(dev, data);
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}
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static struct ethtool_ops virtnet_ethtool_ops = {
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.set_tx_csum = virtnet_set_tx_csum,
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.set_sg = ethtool_op_set_sg,
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};
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static int virtnet_probe(struct virtio_device *vdev)
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{
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int err;
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struct net_device *dev;
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struct virtnet_info *vi;
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/* Allocate ourselves a network device with room for our info */
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dev = alloc_etherdev(sizeof(struct virtnet_info));
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
/* Set up network device as normal. */
|
|
dev->open = virtnet_open;
|
|
dev->stop = virtnet_close;
|
|
dev->hard_start_xmit = start_xmit;
|
|
dev->features = NETIF_F_HIGHDMA;
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
dev->poll_controller = virtnet_netpoll;
|
|
#endif
|
|
SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
|
|
SET_NETDEV_DEV(dev, &vdev->dev);
|
|
|
|
/* Do we support "hardware" checksums? */
|
|
if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
|
|
/* This opens up the world of extra features. */
|
|
dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
|
|
if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
|
|
dev->features |= NETIF_F_TSO | NETIF_F_UFO
|
|
| NETIF_F_TSO_ECN | NETIF_F_TSO6;
|
|
}
|
|
/* Individual feature bits: what can host handle? */
|
|
if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
|
|
dev->features |= NETIF_F_TSO;
|
|
if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
|
|
dev->features |= NETIF_F_TSO6;
|
|
if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
|
|
dev->features |= NETIF_F_TSO_ECN;
|
|
if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
|
|
dev->features |= NETIF_F_UFO;
|
|
}
|
|
|
|
/* Configuration may specify what MAC to use. Otherwise random. */
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
|
|
vdev->config->get(vdev,
|
|
offsetof(struct virtio_net_config, mac),
|
|
dev->dev_addr, dev->addr_len);
|
|
} else
|
|
random_ether_addr(dev->dev_addr);
|
|
|
|
/* Set up our device-specific information */
|
|
vi = netdev_priv(dev);
|
|
netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
|
|
vi->dev = dev;
|
|
vi->vdev = vdev;
|
|
vdev->priv = vi;
|
|
vi->pages = NULL;
|
|
|
|
/* If they give us a callback when all buffers are done, we don't need
|
|
* the timer. */
|
|
vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY);
|
|
|
|
/* If we can receive ANY GSO packets, we must allocate large ones. */
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4)
|
|
|| virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)
|
|
|| virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
|
|
vi->big_packets = true;
|
|
|
|
/* We expect two virtqueues, receive then send. */
|
|
vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done);
|
|
if (IS_ERR(vi->rvq)) {
|
|
err = PTR_ERR(vi->rvq);
|
|
goto free;
|
|
}
|
|
|
|
vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done);
|
|
if (IS_ERR(vi->svq)) {
|
|
err = PTR_ERR(vi->svq);
|
|
goto free_recv;
|
|
}
|
|
|
|
/* Initialize our empty receive and send queues. */
|
|
skb_queue_head_init(&vi->recv);
|
|
skb_queue_head_init(&vi->send);
|
|
|
|
tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi);
|
|
|
|
if (!vi->free_in_tasklet)
|
|
setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi);
|
|
|
|
err = register_netdev(dev);
|
|
if (err) {
|
|
pr_debug("virtio_net: registering device failed\n");
|
|
goto free_send;
|
|
}
|
|
|
|
/* Last of all, set up some receive buffers. */
|
|
try_fill_recv(vi);
|
|
|
|
/* If we didn't even get one input buffer, we're useless. */
|
|
if (vi->num == 0) {
|
|
err = -ENOMEM;
|
|
goto unregister;
|
|
}
|
|
|
|
pr_debug("virtnet: registered device %s\n", dev->name);
|
|
return 0;
|
|
|
|
unregister:
|
|
unregister_netdev(dev);
|
|
free_send:
|
|
vdev->config->del_vq(vi->svq);
|
|
free_recv:
|
|
vdev->config->del_vq(vi->rvq);
|
|
free:
|
|
free_netdev(dev);
|
|
return err;
|
|
}
|
|
|
|
static void virtnet_remove(struct virtio_device *vdev)
|
|
{
|
|
struct virtnet_info *vi = vdev->priv;
|
|
struct sk_buff *skb;
|
|
|
|
/* Stop all the virtqueues. */
|
|
vdev->config->reset(vdev);
|
|
|
|
if (!vi->free_in_tasklet)
|
|
del_timer_sync(&vi->xmit_free_timer);
|
|
|
|
/* Free our skbs in send and recv queues, if any. */
|
|
while ((skb = __skb_dequeue(&vi->recv)) != NULL) {
|
|
kfree_skb(skb);
|
|
vi->num--;
|
|
}
|
|
__skb_queue_purge(&vi->send);
|
|
|
|
BUG_ON(vi->num != 0);
|
|
|
|
vdev->config->del_vq(vi->svq);
|
|
vdev->config->del_vq(vi->rvq);
|
|
unregister_netdev(vi->dev);
|
|
|
|
while (vi->pages)
|
|
__free_pages(get_a_page(vi, GFP_KERNEL), 0);
|
|
|
|
free_netdev(vi->dev);
|
|
}
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
|
|
{ 0 },
|
|
};
|
|
|
|
static unsigned int features[] = {
|
|
VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
|
|
VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
|
|
VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
|
|
VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
|
|
VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */
|
|
VIRTIO_F_NOTIFY_ON_EMPTY,
|
|
};
|
|
|
|
static struct virtio_driver virtio_net = {
|
|
.feature_table = features,
|
|
.feature_table_size = ARRAY_SIZE(features),
|
|
.driver.name = KBUILD_MODNAME,
|
|
.driver.owner = THIS_MODULE,
|
|
.id_table = id_table,
|
|
.probe = virtnet_probe,
|
|
.remove = __devexit_p(virtnet_remove),
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return register_virtio_driver(&virtio_net);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
unregister_virtio_driver(&virtio_net);
|
|
}
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
|
MODULE_DESCRIPTION("Virtio network driver");
|
|
MODULE_LICENSE("GPL");
|