netdevsim: add SR-IOV functionality
dummy driver was extended with VF-related netdev APIs for testing SR-IOV-related software. netdevsim did not exist back then. Implement SR-IOV functionality in netdevsim. Notable difference is that since netdevsim has no module parameters, we will actually create a device with sriov_numvfs attribute for each netdev. The zero MAC address is accepted as some HW use it to mean any address is allowed. Link state is also now validated. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski
Daniel Borkmann
parent
417ec26477
commit
7957922056
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@ -25,6 +25,125 @@
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#include "netdevsim.h"
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struct nsim_vf_config {
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int link_state;
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u16 min_tx_rate;
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u16 max_tx_rate;
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u16 vlan;
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__be16 vlan_proto;
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u16 qos;
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u8 vf_mac[ETH_ALEN];
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bool spoofchk_enabled;
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bool trusted;
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bool rss_query_enabled;
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};
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static u32 nsim_dev_id;
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static int nsim_num_vf(struct device *dev)
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{
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struct netdevsim *ns = to_nsim(dev);
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return ns->num_vfs;
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}
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static struct bus_type nsim_bus = {
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.name = DRV_NAME,
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.dev_name = DRV_NAME,
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.num_vf = nsim_num_vf,
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};
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static int nsim_vfs_enable(struct netdevsim *ns, unsigned int num_vfs)
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{
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ns->vfconfigs = kcalloc(num_vfs, sizeof(struct nsim_vf_config),
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GFP_KERNEL);
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if (!ns->vfconfigs)
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return -ENOMEM;
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ns->num_vfs = num_vfs;
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return 0;
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}
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static void nsim_vfs_disable(struct netdevsim *ns)
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{
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kfree(ns->vfconfigs);
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ns->vfconfigs = NULL;
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ns->num_vfs = 0;
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}
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static ssize_t
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nsim_numvfs_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct netdevsim *ns = to_nsim(dev);
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unsigned int num_vfs;
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int ret;
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ret = kstrtouint(buf, 0, &num_vfs);
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if (ret)
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return ret;
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rtnl_lock();
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if (ns->num_vfs == num_vfs)
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goto exit_good;
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if (ns->num_vfs && num_vfs) {
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ret = -EBUSY;
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goto exit_unlock;
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}
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if (num_vfs) {
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ret = nsim_vfs_enable(ns, num_vfs);
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if (ret)
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goto exit_unlock;
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} else {
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nsim_vfs_disable(ns);
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}
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exit_good:
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ret = count;
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exit_unlock:
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rtnl_unlock();
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return ret;
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}
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static ssize_t
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nsim_numvfs_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct netdevsim *ns = to_nsim(dev);
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return sprintf(buf, "%u\n", ns->num_vfs);
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}
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static struct device_attribute nsim_numvfs_attr =
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__ATTR(sriov_numvfs, 0664, nsim_numvfs_show, nsim_numvfs_store);
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static struct attribute *nsim_dev_attrs[] = {
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&nsim_numvfs_attr.attr,
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NULL,
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};
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static const struct attribute_group nsim_dev_attr_group = {
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.attrs = nsim_dev_attrs,
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};
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static const struct attribute_group *nsim_dev_attr_groups[] = {
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&nsim_dev_attr_group,
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NULL,
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};
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static void nsim_dev_release(struct device *dev)
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{
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struct netdevsim *ns = to_nsim(dev);
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nsim_vfs_disable(ns);
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free_netdev(ns->netdev);
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}
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struct device_type nsim_dev_type = {
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.groups = nsim_dev_attr_groups,
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.release = nsim_dev_release,
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};
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static int nsim_init(struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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@ -37,8 +156,19 @@ static int nsim_init(struct net_device *dev)
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if (err)
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goto err_debugfs_destroy;
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ns->dev.id = nsim_dev_id++;
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ns->dev.bus = &nsim_bus;
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ns->dev.type = &nsim_dev_type;
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err = device_register(&ns->dev);
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if (err)
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goto err_bpf_uninit;
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SET_NETDEV_DEV(dev, &ns->dev);
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return 0;
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err_bpf_uninit:
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nsim_bpf_uninit(ns);
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err_debugfs_destroy:
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debugfs_remove_recursive(ns->ddir);
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return err;
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@ -52,6 +182,14 @@ static void nsim_uninit(struct net_device *dev)
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nsim_bpf_uninit(ns);
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}
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static void nsim_free(struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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device_unregister(&ns->dev);
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/* netdev and vf state will be freed out of device_release() */
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}
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static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct netdevsim *ns = netdev_priv(dev);
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@ -122,6 +260,123 @@ nsim_setup_tc_block(struct net_device *dev, struct tc_block_offload *f)
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}
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}
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static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
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{
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struct netdevsim *ns = netdev_priv(dev);
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/* Only refuse multicast addresses, zero address can mean unset/any. */
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if (vf >= ns->num_vfs || is_multicast_ether_addr(mac))
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return -EINVAL;
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memcpy(ns->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
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return 0;
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}
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static int nsim_set_vf_vlan(struct net_device *dev, int vf,
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u16 vlan, u8 qos, __be16 vlan_proto)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs || vlan > 4095 || qos > 7)
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return -EINVAL;
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ns->vfconfigs[vf].vlan = vlan;
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ns->vfconfigs[vf].qos = qos;
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ns->vfconfigs[vf].vlan_proto = vlan_proto;
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return 0;
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}
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static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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ns->vfconfigs[vf].min_tx_rate = min;
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ns->vfconfigs[vf].max_tx_rate = max;
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return 0;
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}
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static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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ns->vfconfigs[vf].spoofchk_enabled = val;
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return 0;
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}
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static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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ns->vfconfigs[vf].rss_query_enabled = val;
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return 0;
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}
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static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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ns->vfconfigs[vf].trusted = val;
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return 0;
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}
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static int
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nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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ivi->vf = vf;
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ivi->linkstate = ns->vfconfigs[vf].link_state;
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ivi->min_tx_rate = ns->vfconfigs[vf].min_tx_rate;
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ivi->max_tx_rate = ns->vfconfigs[vf].max_tx_rate;
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ivi->vlan = ns->vfconfigs[vf].vlan;
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ivi->vlan_proto = ns->vfconfigs[vf].vlan_proto;
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ivi->qos = ns->vfconfigs[vf].qos;
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memcpy(&ivi->mac, ns->vfconfigs[vf].vf_mac, ETH_ALEN);
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ivi->spoofchk = ns->vfconfigs[vf].spoofchk_enabled;
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ivi->trusted = ns->vfconfigs[vf].trusted;
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ivi->rss_query_en = ns->vfconfigs[vf].rss_query_enabled;
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return 0;
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}
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static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
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{
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struct netdevsim *ns = netdev_priv(dev);
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if (vf >= ns->num_vfs)
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return -EINVAL;
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switch (state) {
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case IFLA_VF_LINK_STATE_AUTO:
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case IFLA_VF_LINK_STATE_ENABLE:
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case IFLA_VF_LINK_STATE_DISABLE:
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break;
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default:
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return -EINVAL;
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}
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ns->vfconfigs[vf].link_state = state;
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return 0;
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}
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static int
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nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
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{
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@ -153,6 +408,14 @@ static const struct net_device_ops nsim_netdev_ops = {
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.ndo_validate_addr = eth_validate_addr,
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.ndo_change_mtu = nsim_change_mtu,
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.ndo_get_stats64 = nsim_get_stats64,
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.ndo_set_vf_mac = nsim_set_vf_mac,
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.ndo_set_vf_vlan = nsim_set_vf_vlan,
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.ndo_set_vf_rate = nsim_set_vf_rate,
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.ndo_set_vf_spoofchk = nsim_set_vf_spoofchk,
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.ndo_set_vf_trust = nsim_set_vf_trust,
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.ndo_get_vf_config = nsim_get_vf_config,
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.ndo_set_vf_link_state = nsim_set_vf_link_state,
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.ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
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.ndo_setup_tc = nsim_setup_tc,
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.ndo_set_features = nsim_set_features,
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.ndo_bpf = nsim_bpf,
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@ -164,7 +427,7 @@ static void nsim_setup(struct net_device *dev)
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eth_hw_addr_random(dev);
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dev->netdev_ops = &nsim_netdev_ops;
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dev->needs_free_netdev = true;
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dev->priv_destructor = nsim_free;
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dev->tx_queue_len = 0;
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dev->flags |= IFF_NOARP;
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@ -209,12 +472,18 @@ static int __init nsim_module_init(void)
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if (IS_ERR(nsim_ddir))
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return PTR_ERR(nsim_ddir);
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err = rtnl_link_register(&nsim_link_ops);
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err = bus_register(&nsim_bus);
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if (err)
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goto err_debugfs_destroy;
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err = rtnl_link_register(&nsim_link_ops);
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if (err)
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goto err_unreg_bus;
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return 0;
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err_unreg_bus:
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bus_unregister(&nsim_bus);
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err_debugfs_destroy:
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debugfs_remove_recursive(nsim_ddir);
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return err;
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@ -223,6 +492,7 @@ err_debugfs_destroy:
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static void __exit nsim_module_exit(void)
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{
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rtnl_link_unregister(&nsim_link_ops);
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bus_unregister(&nsim_bus);
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debugfs_remove_recursive(nsim_ddir);
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}
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@ -13,6 +13,7 @@
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* THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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@ -26,6 +27,7 @@
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struct bpf_prog;
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struct dentry;
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struct nsim_vf_config;
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struct netdevsim {
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struct net_device *netdev;
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@ -34,8 +36,13 @@ struct netdevsim {
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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struct device dev;
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struct dentry *ddir;
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unsigned int num_vfs;
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struct nsim_vf_config *vfconfigs;
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struct bpf_prog *bpf_offloaded;
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u32 bpf_offloaded_id;
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@ -64,3 +71,8 @@ int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
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int nsim_bpf_disable_tc(struct netdevsim *ns);
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int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
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void *type_data, void *cb_priv);
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static inline struct netdevsim *to_nsim(struct device *ptr)
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{
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return container_of(ptr, struct netdevsim, dev);
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}
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