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path: root/drivers/net/netdevsim
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Diffstat (limited to 'drivers/net/netdevsim')
-rw-r--r--drivers/net/netdevsim/bus.c149
-rw-r--r--drivers/net/netdevsim/netdev.c54
-rw-r--r--drivers/net/netdevsim/netdevsim.h3
3 files changed, 199 insertions, 7 deletions
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index bcbc1e19ed..64c0cdd31b 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -129,7 +129,7 @@ static void nsim_bus_dev_release(struct device *dev)
complete(&nsim_bus_devs_released);
}
-static struct device_type nsim_bus_dev_type = {
+static const struct device_type nsim_bus_dev_type = {
.groups = nsim_bus_dev_attr_groups,
.release = nsim_bus_dev_release,
};
@@ -232,9 +232,154 @@ del_device_store(const struct bus_type *bus, const char *buf, size_t count)
}
static BUS_ATTR_WO(del_device);
+static ssize_t link_device_store(const struct bus_type *bus, const char *buf, size_t count)
+{
+ struct netdevsim *nsim_a, *nsim_b, *peer;
+ struct net_device *dev_a, *dev_b;
+ unsigned int ifidx_a, ifidx_b;
+ int netnsfd_a, netnsfd_b, err;
+ struct net *ns_a, *ns_b;
+
+ err = sscanf(buf, "%d:%u %d:%u", &netnsfd_a, &ifidx_a, &netnsfd_b,
+ &ifidx_b);
+ if (err != 4) {
+ pr_err("Format for linking two devices is \"netnsfd_a:ifidx_a netnsfd_b:ifidx_b\" (int uint int uint).\n");
+ return -EINVAL;
+ }
+
+ ns_a = get_net_ns_by_fd(netnsfd_a);
+ if (IS_ERR(ns_a)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd_a);
+ return -EINVAL;
+ }
+
+ ns_b = get_net_ns_by_fd(netnsfd_b);
+ if (IS_ERR(ns_b)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd_b);
+ put_net(ns_a);
+ return -EINVAL;
+ }
+
+ err = -EINVAL;
+ rtnl_lock();
+ dev_a = __dev_get_by_index(ns_a, ifidx_a);
+ if (!dev_a) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx_a, netnsfd_a);
+ goto out_err;
+ }
+
+ if (!netdev_is_nsim(dev_a)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx_a, netnsfd_a);
+ goto out_err;
+ }
+
+ dev_b = __dev_get_by_index(ns_b, ifidx_b);
+ if (!dev_b) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx_b, netnsfd_b);
+ goto out_err;
+ }
+
+ if (!netdev_is_nsim(dev_b)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx_b, netnsfd_b);
+ goto out_err;
+ }
+
+ if (dev_a == dev_b) {
+ pr_err("Cannot link a netdevsim to itself\n");
+ goto out_err;
+ }
+
+ err = -EBUSY;
+ nsim_a = netdev_priv(dev_a);
+ peer = rtnl_dereference(nsim_a->peer);
+ if (peer) {
+ pr_err("Netdevsim %d:%u is already linked\n", netnsfd_a,
+ ifidx_a);
+ goto out_err;
+ }
+
+ nsim_b = netdev_priv(dev_b);
+ peer = rtnl_dereference(nsim_b->peer);
+ if (peer) {
+ pr_err("Netdevsim %d:%u is already linked\n", netnsfd_b,
+ ifidx_b);
+ goto out_err;
+ }
+
+ err = 0;
+ rcu_assign_pointer(nsim_a->peer, nsim_b);
+ rcu_assign_pointer(nsim_b->peer, nsim_a);
+
+out_err:
+ put_net(ns_b);
+ put_net(ns_a);
+ rtnl_unlock();
+
+ return !err ? count : err;
+}
+static BUS_ATTR_WO(link_device);
+
+static ssize_t unlink_device_store(const struct bus_type *bus, const char *buf, size_t count)
+{
+ struct netdevsim *nsim, *peer;
+ struct net_device *dev;
+ unsigned int ifidx;
+ int netnsfd, err;
+ struct net *ns;
+
+ err = sscanf(buf, "%u:%u", &netnsfd, &ifidx);
+ if (err != 2) {
+ pr_err("Format for unlinking a device is \"netnsfd:ifidx\" (int uint).\n");
+ return -EINVAL;
+ }
+
+ ns = get_net_ns_by_fd(netnsfd);
+ if (IS_ERR(ns)) {
+ pr_err("Could not find netns with fd: %d\n", netnsfd);
+ return -EINVAL;
+ }
+
+ err = -EINVAL;
+ rtnl_lock();
+ dev = __dev_get_by_index(ns, ifidx);
+ if (!dev) {
+ pr_err("Could not find device with ifindex %u in netnsfd %d\n",
+ ifidx, netnsfd);
+ goto out_put_netns;
+ }
+
+ if (!netdev_is_nsim(dev)) {
+ pr_err("Device with ifindex %u in netnsfd %d is not a netdevsim\n",
+ ifidx, netnsfd);
+ goto out_put_netns;
+ }
+
+ nsim = netdev_priv(dev);
+ peer = rtnl_dereference(nsim->peer);
+ if (!peer)
+ goto out_put_netns;
+
+ err = 0;
+ RCU_INIT_POINTER(nsim->peer, NULL);
+ RCU_INIT_POINTER(peer->peer, NULL);
+
+out_put_netns:
+ put_net(ns);
+ rtnl_unlock();
+
+ return !err ? count : err;
+}
+static BUS_ATTR_WO(unlink_device);
+
static struct attribute *nsim_bus_attrs[] = {
&bus_attr_new_device.attr,
&bus_attr_del_device.attr,
+ &bus_attr_link_device.attr,
+ &bus_attr_unlink_device.attr,
NULL
};
ATTRIBUTE_GROUPS(nsim_bus);
@@ -260,7 +405,7 @@ static int nsim_num_vf(struct device *dev)
return nsim_bus_dev->num_vfs;
}
-static struct bus_type nsim_bus = {
+static const struct bus_type nsim_bus = {
.name = DRV_NAME,
.dev_name = DRV_NAME,
.bus_groups = nsim_bus_groups,
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 77e8250282..d405809030 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -29,18 +29,35 @@
static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct netdevsim *ns = netdev_priv(dev);
+ unsigned int len = skb->len;
+ struct netdevsim *peer_ns;
+ rcu_read_lock();
if (!nsim_ipsec_tx(ns, skb))
- goto out;
+ goto out_drop_free;
+ peer_ns = rcu_dereference(ns->peer);
+ if (!peer_ns)
+ goto out_drop_free;
+
+ skb_tx_timestamp(skb);
+ if (unlikely(dev_forward_skb(peer_ns->netdev, skb) == NET_RX_DROP))
+ goto out_drop_cnt;
+
+ rcu_read_unlock();
u64_stats_update_begin(&ns->syncp);
ns->tx_packets++;
- ns->tx_bytes += skb->len;
+ ns->tx_bytes += len;
u64_stats_update_end(&ns->syncp);
+ return NETDEV_TX_OK;
-out:
+out_drop_free:
dev_kfree_skb(skb);
-
+out_drop_cnt:
+ rcu_read_unlock();
+ u64_stats_update_begin(&ns->syncp);
+ ns->tx_dropped++;
+ u64_stats_update_end(&ns->syncp);
return NETDEV_TX_OK;
}
@@ -70,6 +87,7 @@ nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
start = u64_stats_fetch_begin(&ns->syncp);
stats->tx_bytes = ns->tx_bytes;
stats->tx_packets = ns->tx_packets;
+ stats->tx_dropped = ns->tx_dropped;
} while (u64_stats_fetch_retry(&ns->syncp, start));
}
@@ -265,6 +283,22 @@ nsim_set_features(struct net_device *dev, netdev_features_t features)
return 0;
}
+static int nsim_get_iflink(const struct net_device *dev)
+{
+ struct netdevsim *nsim, *peer;
+ int iflink;
+
+ nsim = netdev_priv(dev);
+
+ rcu_read_lock();
+ peer = rcu_dereference(nsim->peer);
+ iflink = peer ? READ_ONCE(peer->netdev->ifindex) :
+ READ_ONCE(dev->ifindex);
+ rcu_read_unlock();
+
+ return iflink;
+}
+
static const struct net_device_ops nsim_netdev_ops = {
.ndo_start_xmit = nsim_start_xmit,
.ndo_set_rx_mode = nsim_set_rx_mode,
@@ -282,6 +316,7 @@ static const struct net_device_ops nsim_netdev_ops = {
.ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
.ndo_setup_tc = nsim_setup_tc,
.ndo_set_features = nsim_set_features,
+ .ndo_get_iflink = nsim_get_iflink,
.ndo_bpf = nsim_bpf,
};
@@ -302,7 +337,6 @@ static void nsim_setup(struct net_device *dev)
eth_hw_addr_random(dev);
dev->tx_queue_len = 0;
- dev->flags |= IFF_NOARP;
dev->flags &= ~IFF_MULTICAST;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
IFF_NO_QUEUE;
@@ -413,8 +447,13 @@ err_free_netdev:
void nsim_destroy(struct netdevsim *ns)
{
struct net_device *dev = ns->netdev;
+ struct netdevsim *peer;
rtnl_lock();
+ peer = rtnl_dereference(ns->peer);
+ if (peer)
+ RCU_INIT_POINTER(peer->peer, NULL);
+ RCU_INIT_POINTER(ns->peer, NULL);
unregister_netdevice(dev);
if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
nsim_macsec_teardown(ns);
@@ -427,6 +466,11 @@ void nsim_destroy(struct netdevsim *ns)
free_netdev(dev);
}
+bool netdev_is_nsim(struct net_device *dev)
+{
+ return dev->netdev_ops == &nsim_netdev_ops;
+}
+
static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 028c825b86..553c4b9b4f 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -98,6 +98,7 @@ struct netdevsim {
u64 tx_packets;
u64 tx_bytes;
+ u64 tx_dropped;
struct u64_stats_sync syncp;
struct nsim_bus_dev *nsim_bus_dev;
@@ -125,11 +126,13 @@ struct netdevsim {
} udp_ports;
struct nsim_ethtool ethtool;
+ struct netdevsim __rcu *peer;
};
struct netdevsim *
nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port);
void nsim_destroy(struct netdevsim *ns);
+bool netdev_is_nsim(struct net_device *dev);
void nsim_ethtool_init(struct netdevsim *ns);