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Date: Sun, 22 Jan 2017 12:40:47 +0100
From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To: Roopa Prabhu <roopa@...ulusnetworks.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, stephen@...workplumber.org, tgraf@...g.ch,
hannes@...essinduktion.org, jbenc@...hat.com, pshelar@....org,
dsa@...ulusnetworks.com, hadi@...atatu.com
Subject: Re: [RFC PATCH net-next 2/5] vxlan: make COLLECT_METADATA mode bridge
friendly
On 21/01/17 06:46, Roopa Prabhu wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> This patch series makes vxlan COLLECT_METADATA mode bridge
> and layer2 network friendly. Vxlan COLLECT_METADATA mode today
> solves the per-vni netdev scalability problem in l3 networks.
> When vxlan collect metadata device participates in bridging
> vlan to vn-segments, It can only get the vlan mapped vni in
> the xmit tunnel dst metadata. It will need the vxlan driver to
> continue learn, hold forwarding state and remote destination
> information similar to how it already does for non COLLECT_METADATA
> vxlan netdevices today.
>
> Changes introduced by this patch:
> - allow learning and forwarding database state to vxlan netdev in
> COLLECT_METADATA mode. Current behaviour is not changed
> by default. tunnel info flag IP_TUNNEL_INFO_BRIDGE is used
> to support the new bridge friendly mode.
> - A single fdb table hashed by (mac, vni) to allow fdb entries with
> multiple vnis in the same fdb table
> - rx path already has the vni
> - tx path expects a vni in the packet with dst_metadata
> - prior to this series, fdb remote_dsts carried remote vni and
> the vxlan device carrying the fdb table represented the
> source vni. With the vxlan device now representing multiple vnis,
> this patch adds a src vni attribute to the fdb entry. The remote
> vni already uses NDA_VNI attribute. This patch introduces
> NDA_SRC_VNI netlink attribute to represent the src vni in a multi
> vni fdb table.
>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> ---
[snip]
> @@ -2173,23 +2221,29 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
> bool did_rsc = false;
> struct vxlan_rdst *rdst, *fdst = NULL;
> struct vxlan_fdb *f;
> + __be32 vni = 0;
>
> info = skb_tunnel_info(skb);
>
> skb_reset_mac_header(skb);
>
> if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
> - if (info && info->mode & IP_TUNNEL_INFO_TX)
> - vxlan_xmit_one(skb, dev, NULL, false);
> - else
> - kfree_skb(skb);
> - return NETDEV_TX_OK;
> + if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
> + info->mode & IP_TUNNEL_INFO_TX) {
nit: parentheses around the IP_TUNNEL_INFO_TX check
> + vni = tunnel_id_to_key32(info->key.tun_id);
> + } else {
> + if (info && info->mode & IP_TUNNEL_INFO_TX)
nit: parentheses around the IP_TUNNEL_INFO_TX check
> + vxlan_xmit_one(skb, dev, vni, NULL, false);
> + else
> + kfree_skb(skb);
> + return NETDEV_TX_OK;
> + }
> }
>
> if (vxlan->flags & VXLAN_F_PROXY) {
> eth = eth_hdr(skb);
> if (ntohs(eth->h_proto) == ETH_P_ARP)
> - return arp_reduce(dev, skb);
> + return arp_reduce(dev, skb, vni);
> #if IS_ENABLED(CONFIG_IPV6)
> else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
> pskb_may_pull(skb, sizeof(struct ipv6hdr)
> @@ -2200,13 +2254,13 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
> msg = (struct nd_msg *)skb_transport_header(skb);
> if (msg->icmph.icmp6_code == 0 &&
> msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
> - return neigh_reduce(dev, skb);
> + return neigh_reduce(dev, skb, vni);
> }
> #endif
> }
>
> eth = eth_hdr(skb);
> - f = vxlan_find_mac(vxlan, eth->h_dest);
> + f = vxlan_find_mac(vxlan, eth->h_dest, vni);
> did_rsc = false;
>
> if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
> @@ -2214,11 +2268,11 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
> ntohs(eth->h_proto) == ETH_P_IPV6)) {
> did_rsc = route_shortcircuit(dev, skb);
> if (did_rsc)
> - f = vxlan_find_mac(vxlan, eth->h_dest);
> + f = vxlan_find_mac(vxlan, eth->h_dest, vni);
> }
>
> if (f == NULL) {
> - f = vxlan_find_mac(vxlan, all_zeros_mac);
> + f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
> if (f == NULL) {
> if ((vxlan->flags & VXLAN_F_L2MISS) &&
> !is_multicast_ether_addr(eth->h_dest))
> @@ -2239,11 +2293,11 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
> }
> skb1 = skb_clone(skb, GFP_ATOMIC);
> if (skb1)
> - vxlan_xmit_one(skb1, dev, rdst, did_rsc);
> + vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
> }
>
> if (fdst)
> - vxlan_xmit_one(skb, dev, fdst, did_rsc);
> + vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
> else
> kfree_skb(skb);
> return NETDEV_TX_OK;
> @@ -2307,12 +2361,12 @@ static int vxlan_init(struct net_device *dev)
> return 0;
> }
>
> -static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
> +static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
> {
> struct vxlan_fdb *f;
>
> spin_lock_bh(&vxlan->hash_lock);
> - f = __vxlan_find_mac(vxlan, all_zeros_mac);
> + f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
> if (f)
> vxlan_fdb_destroy(vxlan, f);
> spin_unlock_bh(&vxlan->hash_lock);
> @@ -2322,7 +2376,7 @@ static void vxlan_uninit(struct net_device *dev)
> {
> struct vxlan_dev *vxlan = netdev_priv(dev);
>
> - vxlan_fdb_delete_default(vxlan);
> + vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
>
> free_percpu(dev->tstats);
> }
> @@ -2536,6 +2590,8 @@ static void vxlan_setup(struct net_device *dev)
> dev->vlan_features = dev->features;
> dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
> dev->hw_features |= NETIF_F_GSO_SOFTWARE;
> + dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
> + dev->features |= dev->hw_features;
> netif_keep_dst(dev);
> dev->priv_flags |= IFF_NO_QUEUE;
>
> @@ -2921,6 +2977,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
> NLM_F_EXCL|NLM_F_CREATE,
> vxlan->cfg.dst_port,
> vxlan->default_dst.remote_vni,
> + vxlan->default_dst.remote_vni,
> vxlan->default_dst.remote_ifindex,
> NTF_SELF);
> if (err)
> @@ -2929,7 +2986,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
>
> err = register_netdevice(dev);
> if (err) {
> - vxlan_fdb_delete_default(vxlan);
> + vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
> return err;
> }
>
> @@ -3023,19 +3080,19 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
> conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
>
> if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
> - nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
> + !nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
> conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
>
> if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
> - nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
> + !nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
> conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
>
> if (data[IFLA_VXLAN_REMCSUM_TX] &&
> - nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
> + !nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
> conf.flags |= VXLAN_F_REMCSUM_TX;
>
> if (data[IFLA_VXLAN_REMCSUM_RX] &&
> - nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
> + !nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
> conf.flags |= VXLAN_F_REMCSUM_RX;
Aren't these going to break user-space ?
>
> if (data[IFLA_VXLAN_GBP])
> diff --git a/include/uapi/linux/neighbour.h b/include/uapi/linux/neighbour.h
> index bd99a8d..f3d16db 100644
> --- a/include/uapi/linux/neighbour.h
> +++ b/include/uapi/linux/neighbour.h
> @@ -26,6 +26,7 @@ enum {
> NDA_IFINDEX,
> NDA_MASTER,
> NDA_LINK_NETNSID,
> + NDA_SRC_VNI,
> __NDA_MAX
> };
>
>
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