[Feature][T106]ZXW P56U09 code
Only Configure: Yes
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: No
Doc Update: No
Change-Id: I3cbd8b420271eb20c2b40ebe5c78f83059cd42f3
diff --git a/ap/os/linux/linux-3.4.x/drivers/net/virtio_net.c b/ap/os/linux/linux-3.4.x/drivers/net/virtio_net.c
new file mode 100644
index 0000000..efb50d6
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/net/virtio_net.c
@@ -0,0 +1,1270 @@
+/* A network driver using virtio.
+ *
+ * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+//#define DEBUG
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/module.h>
+#include <linux/virtio.h>
+#include <linux/virtio_net.h>
+#include <linux/scatterlist.h>
+#include <linux/if_vlan.h>
+#include <linux/slab.h>
+
+static int napi_weight = 128;
+module_param(napi_weight, int, 0444);
+
+static bool csum = true, gso = true;
+module_param(csum, bool, 0444);
+module_param(gso, bool, 0444);
+
+/* FIXME: MTU in config. */
+#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
+#define GOOD_COPY_LEN 128
+
+#define VIRTNET_SEND_COMMAND_SG_MAX 2
+#define VIRTNET_DRIVER_VERSION "1.0.0"
+
+struct virtnet_stats {
+ struct u64_stats_sync syncp;
+ u64 tx_bytes;
+ u64 tx_packets;
+
+ u64 rx_bytes;
+ u64 rx_packets;
+};
+
+struct virtnet_info {
+ struct virtio_device *vdev;
+ struct virtqueue *rvq, *svq, *cvq;
+ struct net_device *dev;
+ struct napi_struct napi;
+ unsigned int status;
+
+ /* Number of input buffers, and max we've ever had. */
+ unsigned int num, max;
+
+ /* I like... big packets and I cannot lie! */
+ bool big_packets;
+
+ /* Host will merge rx buffers for big packets (shake it! shake it!) */
+ bool mergeable_rx_bufs;
+
+ /* Active statistics */
+ struct virtnet_stats __percpu *stats;
+
+ /* Work struct for refilling if we run low on memory. */
+ struct delayed_work refill;
+
+ /* Chain pages by the private ptr. */
+ struct page *pages;
+
+ /* fragments + linear part + virtio header */
+ struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
+ struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
+};
+
+struct skb_vnet_hdr {
+ union {
+ struct virtio_net_hdr hdr;
+ struct virtio_net_hdr_mrg_rxbuf mhdr;
+ };
+ unsigned int num_sg;
+};
+
+struct padded_vnet_hdr {
+ struct virtio_net_hdr hdr;
+ /*
+ * virtio_net_hdr should be in a separated sg buffer because of a
+ * QEMU bug, and data sg buffer shares same page with this header sg.
+ * This padding makes next sg 16 byte aligned after virtio_net_hdr.
+ */
+ char padding[6];
+};
+
+static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
+{
+ return (struct skb_vnet_hdr *)skb->cb;
+}
+
+/*
+ * private is used to chain pages for big packets, put the whole
+ * most recent used list in the beginning for reuse
+ */
+static void give_pages(struct virtnet_info *vi, struct page *page)
+{
+ struct page *end;
+
+ /* Find end of list, sew whole thing into vi->pages. */
+ for (end = page; end->private; end = (struct page *)end->private);
+ end->private = (unsigned long)vi->pages;
+ vi->pages = page;
+}
+
+static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
+{
+ struct page *p = vi->pages;
+
+ if (p) {
+ vi->pages = (struct page *)p->private;
+ /* clear private here, it is used to chain pages */
+ p->private = 0;
+ } else
+ p = alloc_page(gfp_mask);
+ return p;
+}
+
+static void skb_xmit_done(struct virtqueue *svq)
+{
+ struct virtnet_info *vi = svq->vdev->priv;
+
+ /* Suppress further interrupts. */
+ virtqueue_disable_cb(svq);
+
+ /* We were probably waiting for more output buffers. */
+ netif_wake_queue(vi->dev);
+}
+
+static void set_skb_frag(struct sk_buff *skb, struct page *page,
+ unsigned int offset, unsigned int *len)
+{
+ int size = min((unsigned)PAGE_SIZE - offset, *len);
+ int i = skb_shinfo(skb)->nr_frags;
+
+ __skb_fill_page_desc(skb, i, page, offset, size);
+
+ skb->data_len += size;
+ skb->len += size;
+ skb->truesize += PAGE_SIZE;
+ skb_shinfo(skb)->nr_frags++;
+ *len -= size;
+}
+
+/* Called from bottom half context */
+static struct sk_buff *page_to_skb(struct virtnet_info *vi,
+ struct page *page, unsigned int len)
+{
+ struct sk_buff *skb;
+ struct skb_vnet_hdr *hdr;
+ unsigned int copy, hdr_len, offset;
+ char *p;
+
+ p = page_address(page);
+
+ /* copy small packet so we can reuse these pages for small data */
+ skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
+ if (unlikely(!skb))
+ return NULL;
+
+ hdr = skb_vnet_hdr(skb);
+
+ if (vi->mergeable_rx_bufs) {
+ hdr_len = sizeof hdr->mhdr;
+ offset = hdr_len;
+ } else {
+ hdr_len = sizeof hdr->hdr;
+ offset = sizeof(struct padded_vnet_hdr);
+ }
+
+ memcpy(hdr, p, hdr_len);
+
+ len -= hdr_len;
+ p += offset;
+
+ copy = len;
+ if (copy > skb_tailroom(skb))
+ copy = skb_tailroom(skb);
+ memcpy(skb_put(skb, copy), p, copy);
+
+ len -= copy;
+ offset += copy;
+
+ /*
+ * Verify that we can indeed put this data into a skb.
+ * This is here to handle cases when the device erroneously
+ * tries to receive more than is possible. This is usually
+ * the case of a broken device.
+ */
+ if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
+ if (net_ratelimit())
+ pr_debug("%s: too much data\n", skb->dev->name);
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+
+ while (len) {
+ set_skb_frag(skb, page, offset, &len);
+ page = (struct page *)page->private;
+ offset = 0;
+ }
+
+ if (page)
+ give_pages(vi, page);
+
+ return skb;
+}
+
+static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
+{
+ struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
+ struct page *page;
+ int num_buf, i, len;
+
+ num_buf = hdr->mhdr.num_buffers;
+ while (--num_buf) {
+ i = skb_shinfo(skb)->nr_frags;
+ if (i >= MAX_SKB_FRAGS) {
+ pr_debug("%s: packet too long\n", skb->dev->name);
+ skb->dev->stats.rx_length_errors++;
+ return -EINVAL;
+ }
+ page = virtqueue_get_buf(vi->rvq, &len);
+ if (!page) {
+ pr_debug("%s: rx error: %d buffers missing\n",
+ skb->dev->name, hdr->mhdr.num_buffers);
+ skb->dev->stats.rx_length_errors++;
+ return -EINVAL;
+ }
+
+ if (len > PAGE_SIZE)
+ len = PAGE_SIZE;
+
+ set_skb_frag(skb, page, 0, &len);
+
+ --vi->num;
+ }
+ return 0;
+}
+
+static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
+ struct sk_buff *skb;
+ struct page *page;
+ struct skb_vnet_hdr *hdr;
+
+ if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
+ pr_debug("%s: short packet %i\n", dev->name, len);
+ dev->stats.rx_length_errors++;
+ if (vi->mergeable_rx_bufs || vi->big_packets)
+ give_pages(vi, buf);
+ else
+ dev_kfree_skb(buf);
+ return;
+ }
+
+ if (!vi->mergeable_rx_bufs && !vi->big_packets) {
+ skb = buf;
+ len -= sizeof(struct virtio_net_hdr);
+ skb_trim(skb, len);
+ } else {
+ page = buf;
+ skb = page_to_skb(vi, page, len);
+ if (unlikely(!skb)) {
+ dev->stats.rx_dropped++;
+ give_pages(vi, page);
+ return;
+ }
+ if (vi->mergeable_rx_bufs)
+ if (receive_mergeable(vi, skb)) {
+ dev_kfree_skb(skb);
+ return;
+ }
+ }
+
+ hdr = skb_vnet_hdr(skb);
+
+ u64_stats_update_begin(&stats->syncp);
+ stats->rx_bytes += skb->len;
+ stats->rx_packets++;
+ u64_stats_update_end(&stats->syncp);
+
+ if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ pr_debug("Needs csum!\n");
+ if (!skb_partial_csum_set(skb,
+ hdr->hdr.csum_start,
+ hdr->hdr.csum_offset))
+ goto frame_err;
+ } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ skb->protocol = eth_type_trans(skb, dev);
+ pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
+ ntohs(skb->protocol), skb->len, skb->pkt_type);
+
+ if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ pr_debug("GSO!\n");
+ switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ case VIRTIO_NET_HDR_GSO_TCPV4:
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+ break;
+ case VIRTIO_NET_HDR_GSO_UDP:
+ skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
+ break;
+ case VIRTIO_NET_HDR_GSO_TCPV6:
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
+ break;
+ default:
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s: bad gso type %u.\n",
+ dev->name, hdr->hdr.gso_type);
+ goto frame_err;
+ }
+
+ if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
+ skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
+
+ skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
+ if (skb_shinfo(skb)->gso_size == 0) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s: zero gso size.\n",
+ dev->name);
+ goto frame_err;
+ }
+
+ /* Header must be checked, and gso_segs computed. */
+ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
+ skb_shinfo(skb)->gso_segs = 0;
+ }
+
+ netif_receive_skb(skb);
+ return;
+
+frame_err:
+ dev->stats.rx_frame_errors++;
+ dev_kfree_skb(skb);
+}
+
+static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
+{
+ struct sk_buff *skb;
+ struct skb_vnet_hdr *hdr;
+ int err;
+
+ skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+ skb_put(skb, MAX_PACKET_LEN);
+
+ hdr = skb_vnet_hdr(skb);
+ sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
+
+ skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
+
+ err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
+ if (err < 0)
+ dev_kfree_skb(skb);
+
+ return err;
+}
+
+static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
+{
+ struct page *first, *list = NULL;
+ char *p;
+ int i, err, offset;
+
+ /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
+ for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
+ first = get_a_page(vi, gfp);
+ if (!first) {
+ if (list)
+ give_pages(vi, list);
+ return -ENOMEM;
+ }
+ sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
+
+ /* chain new page in list head to match sg */
+ first->private = (unsigned long)list;
+ list = first;
+ }
+
+ first = get_a_page(vi, gfp);
+ if (!first) {
+ give_pages(vi, list);
+ return -ENOMEM;
+ }
+ p = page_address(first);
+
+ /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
+ /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
+ sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
+
+ /* vi->rx_sg[1] for data packet, from offset */
+ offset = sizeof(struct padded_vnet_hdr);
+ sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
+
+ /* chain first in list head */
+ first->private = (unsigned long)list;
+ err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
+ first, gfp);
+ if (err < 0)
+ give_pages(vi, first);
+
+ return err;
+}
+
+static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
+{
+ struct page *page;
+ int err;
+
+ page = get_a_page(vi, gfp);
+ if (!page)
+ return -ENOMEM;
+
+ sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
+
+ err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
+ if (err < 0)
+ give_pages(vi, page);
+
+ return err;
+}
+
+/*
+ * Returns false if we couldn't fill entirely (OOM).
+ *
+ * Normally run in the receive path, but can also be run from ndo_open
+ * before we're receiving packets, or from refill_work which is
+ * careful to disable receiving (using napi_disable).
+ */
+static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
+{
+ int err;
+ bool oom;
+
+ do {
+ if (vi->mergeable_rx_bufs)
+ err = add_recvbuf_mergeable(vi, gfp);
+ else if (vi->big_packets)
+ err = add_recvbuf_big(vi, gfp);
+ else
+ err = add_recvbuf_small(vi, gfp);
+
+ oom = err == -ENOMEM;
+ if (err < 0)
+ break;
+ ++vi->num;
+ } while (err > 0);
+ if (unlikely(vi->num > vi->max))
+ vi->max = vi->num;
+ virtqueue_kick(vi->rvq);
+ return !oom;
+}
+
+static void skb_recv_done(struct virtqueue *rvq)
+{
+ struct virtnet_info *vi = rvq->vdev->priv;
+ /* Schedule NAPI, Suppress further interrupts if successful. */
+ if (napi_schedule_prep(&vi->napi)) {
+ virtqueue_disable_cb(rvq);
+ __napi_schedule(&vi->napi);
+ }
+}
+
+static void virtnet_napi_enable(struct virtnet_info *vi)
+{
+ napi_enable(&vi->napi);
+
+ /* If all buffers were filled by other side before we napi_enabled, we
+ * won't get another interrupt, so process any outstanding packets
+ * now. virtnet_poll wants re-enable the queue, so we disable here.
+ * We synchronize against interrupts via NAPI_STATE_SCHED */
+ if (napi_schedule_prep(&vi->napi)) {
+ virtqueue_disable_cb(vi->rvq);
+ local_bh_disable();
+ __napi_schedule(&vi->napi);
+ local_bh_enable();
+ }
+}
+
+static void refill_work(struct work_struct *work)
+{
+ struct virtnet_info *vi;
+ bool still_empty;
+
+ vi = container_of(work, struct virtnet_info, refill.work);
+ napi_disable(&vi->napi);
+ still_empty = !try_fill_recv(vi, GFP_KERNEL);
+ virtnet_napi_enable(vi);
+
+ /* In theory, this can happen: if we don't get any buffers in
+ * we will *never* try to fill again. */
+ if (still_empty)
+ queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2);
+}
+
+static int virtnet_poll(struct napi_struct *napi, int budget)
+{
+ struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
+ void *buf;
+ unsigned int r, len, received = 0;
+
+again:
+ while (received < budget &&
+ (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
+ receive_buf(vi->dev, buf, len);
+ --vi->num;
+ received++;
+ }
+
+ if (vi->num < vi->max / 2) {
+ if (!try_fill_recv(vi, GFP_ATOMIC))
+ queue_delayed_work(system_nrt_wq, &vi->refill, 0);
+ }
+
+ /* Out of packets? */
+ if (received < budget) {
+ r = virtqueue_enable_cb_prepare(vi->rvq);
+ napi_complete(napi);
+ if (unlikely(virtqueue_poll(vi->rvq, r)) &&
+ napi_schedule_prep(napi)) {
+ virtqueue_disable_cb(vi->rvq);
+ __napi_schedule(napi);
+ goto again;
+ }
+ }
+
+ return received;
+}
+
+static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
+{
+ struct sk_buff *skb;
+ unsigned int len, tot_sgs = 0;
+ struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
+
+ while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
+ pr_debug("Sent skb %p\n", skb);
+
+ u64_stats_update_begin(&stats->syncp);
+ stats->tx_bytes += skb->len;
+ stats->tx_packets++;
+ u64_stats_update_end(&stats->syncp);
+
+ tot_sgs += skb_vnet_hdr(skb)->num_sg;
+ dev_kfree_skb_any(skb);
+ }
+ return tot_sgs;
+}
+
+static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
+{
+ struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
+ const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
+
+ pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ hdr->hdr.csum_start = skb_checksum_start_offset(skb);
+ hdr->hdr.csum_offset = skb->csum_offset;
+ } else {
+ hdr->hdr.flags = 0;
+ hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
+ }
+
+ if (skb_is_gso(skb)) {
+ hdr->hdr.hdr_len = skb_headlen(skb);
+ hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
+ else
+ BUG();
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
+ hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
+ } else {
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
+ hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
+ }
+
+ hdr->mhdr.num_buffers = 0;
+
+ /* Encode metadata header at front. */
+ if (vi->mergeable_rx_bufs)
+ sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
+ else
+ sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
+
+ hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
+ return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
+ 0, skb, GFP_ATOMIC);
+}
+
+static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int capacity;
+
+ /* Free up any pending old buffers before queueing new ones. */
+ free_old_xmit_skbs(vi);
+
+ /* Try to transmit */
+ capacity = xmit_skb(vi, skb);
+
+ /* This can happen with OOM and indirect buffers. */
+ if (unlikely(capacity < 0)) {
+ if (likely(capacity == -ENOMEM)) {
+ if (net_ratelimit())
+ dev_warn(&dev->dev,
+ "TX queue failure: out of memory\n");
+ } else {
+ dev->stats.tx_fifo_errors++;
+ if (net_ratelimit())
+ dev_warn(&dev->dev,
+ "Unexpected TX queue failure: %d\n",
+ capacity);
+ }
+ dev->stats.tx_dropped++;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+ virtqueue_kick(vi->svq);
+
+ /* Don't wait up for transmitted skbs to be freed. */
+ skb_orphan(skb);
+ nf_reset(skb);
+
+ /* Apparently nice girls don't return TX_BUSY; stop the queue
+ * before it gets out of hand. Naturally, this wastes entries. */
+ if (capacity < 2+MAX_SKB_FRAGS) {
+ netif_stop_queue(dev);
+ if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
+ /* More just got used, free them then recheck. */
+ capacity += free_old_xmit_skbs(vi);
+ if (capacity >= 2+MAX_SKB_FRAGS) {
+ netif_start_queue(dev);
+ virtqueue_disable_cb(vi->svq);
+ }
+ }
+ }
+
+ return NETDEV_TX_OK;
+}
+
+static int virtnet_set_mac_address(struct net_device *dev, void *p)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtio_device *vdev = vi->vdev;
+ int ret;
+
+ ret = eth_mac_addr(dev, p);
+ if (ret)
+ return ret;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
+ vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
+ dev->dev_addr, dev->addr_len);
+
+ return 0;
+}
+
+static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *tot)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int cpu;
+ unsigned int start;
+
+ for_each_possible_cpu(cpu) {
+ struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
+ u64 tpackets, tbytes, rpackets, rbytes;
+
+ do {
+ start = u64_stats_fetch_begin(&stats->syncp);
+ tpackets = stats->tx_packets;
+ tbytes = stats->tx_bytes;
+ rpackets = stats->rx_packets;
+ rbytes = stats->rx_bytes;
+ } while (u64_stats_fetch_retry(&stats->syncp, start));
+
+ tot->rx_packets += rpackets;
+ tot->tx_packets += tpackets;
+ tot->rx_bytes += rbytes;
+ tot->tx_bytes += tbytes;
+ }
+
+ tot->tx_dropped = dev->stats.tx_dropped;
+ tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+ tot->rx_dropped = dev->stats.rx_dropped;
+ tot->rx_length_errors = dev->stats.rx_length_errors;
+ tot->rx_frame_errors = dev->stats.rx_frame_errors;
+
+ return tot;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void virtnet_netpoll(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ napi_schedule(&vi->napi);
+}
+#endif
+
+static int virtnet_open(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ /* Make sure we have some buffers: if oom use wq. */
+ if (!try_fill_recv(vi, GFP_KERNEL))
+ queue_delayed_work(system_nrt_wq, &vi->refill, 0);
+
+ virtnet_napi_enable(vi);
+ return 0;
+}
+
+/*
+ * Send command via the control virtqueue and check status. Commands
+ * supported by the hypervisor, as indicated by feature bits, should
+ * never fail unless improperly formated.
+ */
+static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
+ struct scatterlist *data, int out, int in)
+{
+ struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
+ struct virtio_net_ctrl_hdr ctrl;
+ virtio_net_ctrl_ack status = ~0;
+ unsigned int tmp;
+ int i;
+
+ /* Caller should know better */
+ BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
+ (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
+
+ out++; /* Add header */
+ in++; /* Add return status */
+
+ ctrl.class = class;
+ ctrl.cmd = cmd;
+
+ sg_init_table(sg, out + in);
+
+ sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
+ for_each_sg(data, s, out + in - 2, i)
+ sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
+ sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
+
+ BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
+
+ virtqueue_kick(vi->cvq);
+
+ /*
+ * Spin for a response, the kick causes an ioport write, trapping
+ * into the hypervisor, so the request should be handled immediately.
+ */
+ while (!virtqueue_get_buf(vi->cvq, &tmp))
+ cpu_relax();
+
+ return status == VIRTIO_NET_OK;
+}
+
+static int virtnet_close(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ /* Make sure refill_work doesn't re-enable napi! */
+ cancel_delayed_work_sync(&vi->refill);
+ napi_disable(&vi->napi);
+
+ return 0;
+}
+
+static void virtnet_set_rx_mode(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg[2];
+ u8 promisc, allmulti;
+ struct virtio_net_ctrl_mac *mac_data;
+ struct netdev_hw_addr *ha;
+ int uc_count;
+ int mc_count;
+ void *buf;
+ int i;
+
+ /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
+ if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
+ return;
+
+ promisc = ((dev->flags & IFF_PROMISC) != 0);
+ allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
+
+ sg_init_one(sg, &promisc, sizeof(promisc));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
+ VIRTIO_NET_CTRL_RX_PROMISC,
+ sg, 1, 0))
+ dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
+ promisc ? "en" : "dis");
+
+ sg_init_one(sg, &allmulti, sizeof(allmulti));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
+ VIRTIO_NET_CTRL_RX_ALLMULTI,
+ sg, 1, 0))
+ dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
+ allmulti ? "en" : "dis");
+
+ uc_count = netdev_uc_count(dev);
+ mc_count = netdev_mc_count(dev);
+ /* MAC filter - use one buffer for both lists */
+ buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
+ (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
+ mac_data = buf;
+ if (!buf) {
+ dev_warn(&dev->dev, "No memory for MAC address buffer\n");
+ return;
+ }
+
+ sg_init_table(sg, 2);
+
+ /* Store the unicast list and count in the front of the buffer */
+ mac_data->entries = uc_count;
+ i = 0;
+ netdev_for_each_uc_addr(ha, dev)
+ memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
+
+ sg_set_buf(&sg[0], mac_data,
+ sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
+
+ /* multicast list and count fill the end */
+ mac_data = (void *)&mac_data->macs[uc_count][0];
+
+ mac_data->entries = mc_count;
+ i = 0;
+ netdev_for_each_mc_addr(ha, dev)
+ memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
+
+ sg_set_buf(&sg[1], mac_data,
+ sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
+ VIRTIO_NET_CTRL_MAC_TABLE_SET,
+ sg, 2, 0))
+ dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
+
+ kfree(buf);
+}
+
+static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg;
+
+ sg_init_one(&sg, &vid, sizeof(vid));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
+ VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
+ dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
+ return 0;
+}
+
+static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg;
+
+ sg_init_one(&sg, &vid, sizeof(vid));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
+ VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
+ dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
+ return 0;
+}
+
+static void virtnet_get_ringparam(struct net_device *dev,
+ struct ethtool_ringparam *ring)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
+ ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
+ ring->rx_pending = ring->rx_max_pending;
+ ring->tx_pending = ring->tx_max_pending;
+
+}
+
+
+static void virtnet_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtio_device *vdev = vi->vdev;
+
+ strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
+ strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
+ strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
+
+}
+
+static const struct ethtool_ops virtnet_ethtool_ops = {
+ .get_drvinfo = virtnet_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ringparam = virtnet_get_ringparam,
+};
+
+#define MIN_MTU 68
+#define MAX_MTU 65535
+
+static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static const struct net_device_ops virtnet_netdev = {
+ .ndo_open = virtnet_open,
+ .ndo_stop = virtnet_close,
+ .ndo_start_xmit = start_xmit,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = virtnet_set_mac_address,
+ .ndo_set_rx_mode = virtnet_set_rx_mode,
+ .ndo_change_mtu = virtnet_change_mtu,
+ .ndo_get_stats64 = virtnet_stats,
+ .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = virtnet_netpoll,
+#endif
+};
+
+static void virtnet_update_status(struct virtnet_info *vi)
+{
+ u16 v;
+
+ if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
+ offsetof(struct virtio_net_config, status),
+ &v) < 0)
+ return;
+
+ /* Ignore unknown (future) status bits */
+ v &= VIRTIO_NET_S_LINK_UP;
+
+ if (vi->status == v)
+ return;
+
+ vi->status = v;
+
+ if (vi->status & VIRTIO_NET_S_LINK_UP) {
+ netif_carrier_on(vi->dev);
+ netif_wake_queue(vi->dev);
+ } else {
+ netif_carrier_off(vi->dev);
+ netif_stop_queue(vi->dev);
+ }
+}
+
+static void virtnet_config_changed(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+
+ virtnet_update_status(vi);
+}
+
+static int init_vqs(struct virtnet_info *vi)
+{
+ struct virtqueue *vqs[3];
+ vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
+ const char *names[] = { "input", "output", "control" };
+ int nvqs, err;
+
+ /* We expect two virtqueues, receive then send,
+ * and optionally control. */
+ nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
+
+ err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
+ if (err)
+ return err;
+
+ vi->rvq = vqs[0];
+ vi->svq = vqs[1];
+
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
+ vi->cvq = vqs[2];
+
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
+ vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
+ }
+ return 0;
+}
+
+static int virtnet_probe(struct virtio_device *vdev)
+{
+ int err;
+ struct net_device *dev;
+ struct virtnet_info *vi;
+
+ /* Allocate ourselves a network device with room for our info */
+ dev = alloc_etherdev(sizeof(struct virtnet_info));
+ if (!dev)
+ return -ENOMEM;
+
+ /* Set up network device as normal. */
+ dev->priv_flags |= IFF_UNICAST_FLT;
+ dev->netdev_ops = &virtnet_netdev;
+ dev->features = NETIF_F_HIGHDMA;
+
+ SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
+ SET_NETDEV_DEV(dev, &vdev->dev);
+
+ /* Do we support "hardware" checksums? */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
+ /* This opens up the world of extra features. */
+ dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+ if (csum)
+ dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
+ dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
+ | NETIF_F_TSO_ECN | NETIF_F_TSO6;
+ }
+ /* Individual feature bits: what can host handle? */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
+ dev->hw_features |= NETIF_F_TSO;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
+ dev->hw_features |= NETIF_F_TSO6;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
+ dev->hw_features |= NETIF_F_TSO_ECN;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
+ dev->hw_features |= NETIF_F_UFO;
+
+ if (gso)
+ dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
+ /* (!csum && gso) case will be fixed by register_netdev() */
+ }
+
+ /* Configuration may specify what MAC to use. Otherwise random. */
+ if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
+ offsetof(struct virtio_net_config, mac),
+ dev->dev_addr, dev->addr_len) < 0)
+ eth_hw_addr_random(dev);
+
+ /* 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;
+ vi->stats = alloc_percpu(struct virtnet_stats);
+ err = -ENOMEM;
+ if (vi->stats == NULL)
+ goto free;
+
+ INIT_DELAYED_WORK(&vi->refill, refill_work);
+ sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
+ sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
+
+ /* 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) ||
+ virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
+ vi->big_packets = true;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
+ vi->mergeable_rx_bufs = true;
+
+ err = init_vqs(vi);
+ if (err)
+ goto free_stats;
+
+ err = register_netdev(dev);
+ if (err) {
+ pr_debug("virtio_net: registering device failed\n");
+ goto free_vqs;
+ }
+
+ /* Last of all, set up some receive buffers. */
+ try_fill_recv(vi, GFP_KERNEL);
+
+ /* If we didn't even get one input buffer, we're useless. */
+ if (vi->num == 0) {
+ err = -ENOMEM;
+ goto unregister;
+ }
+
+ /* Assume link up if device can't report link status,
+ otherwise get link status from config. */
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
+ netif_carrier_off(dev);
+ virtnet_update_status(vi);
+ } else {
+ vi->status = VIRTIO_NET_S_LINK_UP;
+ netif_carrier_on(dev);
+ }
+
+ pr_debug("virtnet: registered device %s\n", dev->name);
+ return 0;
+
+unregister:
+ unregister_netdev(dev);
+free_vqs:
+ vdev->config->del_vqs(vdev);
+free_stats:
+ free_percpu(vi->stats);
+free:
+ free_netdev(dev);
+ return err;
+}
+
+static void free_unused_bufs(struct virtnet_info *vi)
+{
+ void *buf;
+ while (1) {
+ buf = virtqueue_detach_unused_buf(vi->svq);
+ if (!buf)
+ break;
+ dev_kfree_skb(buf);
+ }
+ while (1) {
+ buf = virtqueue_detach_unused_buf(vi->rvq);
+ if (!buf)
+ break;
+ if (vi->mergeable_rx_bufs || vi->big_packets)
+ give_pages(vi, buf);
+ else
+ dev_kfree_skb(buf);
+ --vi->num;
+ }
+ BUG_ON(vi->num != 0);
+}
+
+static void remove_vq_common(struct virtnet_info *vi)
+{
+ vi->vdev->config->reset(vi->vdev);
+
+ /* Free unused buffers in both send and recv, if any. */
+ free_unused_bufs(vi);
+
+ vi->vdev->config->del_vqs(vi->vdev);
+
+ while (vi->pages)
+ __free_pages(get_a_page(vi, GFP_KERNEL), 0);
+}
+
+static void __devexit virtnet_remove(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+
+ unregister_netdev(vi->dev);
+
+ remove_vq_common(vi);
+
+ free_percpu(vi->stats);
+ free_netdev(vi->dev);
+}
+
+#ifdef CONFIG_PM
+static int virtnet_freeze(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+
+ virtqueue_disable_cb(vi->rvq);
+ virtqueue_disable_cb(vi->svq);
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
+ virtqueue_disable_cb(vi->cvq);
+
+ netif_device_detach(vi->dev);
+ cancel_delayed_work_sync(&vi->refill);
+
+ if (netif_running(vi->dev))
+ napi_disable(&vi->napi);
+
+ remove_vq_common(vi);
+
+ return 0;
+}
+
+static int virtnet_restore(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+ int err;
+
+ err = init_vqs(vi);
+ if (err)
+ return err;
+
+ if (netif_running(vi->dev))
+ virtnet_napi_enable(vi);
+
+ netif_device_attach(vi->dev);
+
+ if (!try_fill_recv(vi, GFP_KERNEL))
+ queue_delayed_work(system_nrt_wq, &vi->refill, 0);
+
+ return 0;
+}
+#endif
+
+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, VIRTIO_NET_F_GUEST_UFO,
+ VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
+ VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
+};
+
+static struct virtio_driver virtio_net_driver = {
+ .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),
+ .config_changed = virtnet_config_changed,
+#ifdef CONFIG_PM
+ .freeze = virtnet_freeze,
+ .restore = virtnet_restore,
+#endif
+};
+
+static int __init init(void)
+{
+ return register_virtio_driver(&virtio_net_driver);
+}
+
+static void __exit fini(void)
+{
+ unregister_virtio_driver(&virtio_net_driver);
+}
+module_init(init);
+module_exit(fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio network driver");
+MODULE_LICENSE("GPL");