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authorJakub Kicinski <kuba@kernel.org>2020-07-10 03:42:47 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-10 23:54:00 +0300
commitc7d759eb7b12f91a25f4d3cd03ff5209046ddfc2 (patch)
treef11b19ed2d80954df499dd87d3520784a3536157 /net/ethtool/tunnels.c
parentcc4e3835eff474aa274d6e1d18f69d9d296d3b76 (diff)
downloadlinux-c7d759eb7b12f91a25f4d3cd03ff5209046ddfc2.tar.xz
ethtool: add tunnel info interface
Add an interface to report offloaded UDP ports via ethtool netlink. Now that core takes care of tracking which UDP tunnel ports the NICs are aware of we can quite easily export this information out to user space. The responsibility of writing the netlink dumps is split between ethtool code and udp_tunnel_nic.c - since udp_tunnel module may not always be loaded, yet we should always report the capabilities of the NIC. $ ethtool --show-tunnels eth0 Tunnel information for eth0: UDP port table 0: Size: 4 Types: vxlan No entries UDP port table 1: Size: 4 Types: geneve, vxlan-gpe Entries (1): port 1230, vxlan-gpe v4: - back to v2, build fix is now directly in udp_tunnel.h v3: - don't compile ETHTOOL_MSG_TUNNEL_INFO_GET in if CONFIG_INET not set. v2: - fix string set count, - reorder enums in the uAPI, - fix type of ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES to bitset in docs and comments. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethtool/tunnels.c')
-rw-r--r--net/ethtool/tunnels.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/net/ethtool/tunnels.c b/net/ethtool/tunnels.c
new file mode 100644
index 000000000000..6b89255f1231
--- /dev/null
+++ b/net/ethtool/tunnels.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/ethtool_netlink.h>
+#include <net/udp_tunnel.h>
+
+#include "bitset.h"
+#include "common.h"
+#include "netlink.h"
+
+static const struct nla_policy
+ethtool_tunnel_info_policy[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {
+ [ETHTOOL_A_TUNNEL_INFO_UNSPEC] = { .type = NLA_REJECT },
+ [ETHTOOL_A_TUNNEL_INFO_HEADER] = { .type = NLA_NESTED },
+};
+
+static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
+static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
+static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
+ ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
+
+static ssize_t
+ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
+ struct netlink_ext_ack *extack)
+{
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ const struct udp_tunnel_nic_info *info;
+ unsigned int i;
+ size_t size;
+ int ret;
+
+ info = req_base->dev->udp_tunnel_nic_info;
+ if (!info) {
+ NL_SET_ERR_MSG(extack,
+ "device does not report tunnel offload info");
+ return -EOPNOTSUPP;
+ }
+
+ size = nla_total_size(0); /* _INFO_UDP_PORTS */
+
+ for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
+ if (!info->tables[i].n_entries)
+ return size;
+
+ size += nla_total_size(0); /* _UDP_TABLE */
+ size += nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
+ ret = ethnl_bitset32_size(&info->tables[i].tunnel_types, NULL,
+ __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
+ udp_tunnel_type_names, compact);
+ if (ret < 0)
+ return ret;
+ size += ret;
+
+ size += udp_tunnel_nic_dump_size(req_base->dev, i);
+ }
+
+ return size;
+}
+
+static int
+ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
+ struct sk_buff *skb)
+{
+ bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
+ const struct udp_tunnel_nic_info *info;
+ struct nlattr *ports, *table;
+ unsigned int i;
+
+ info = req_base->dev->udp_tunnel_nic_info;
+ if (!info)
+ return -EOPNOTSUPP;
+
+ ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
+ if (!ports)
+ return -EMSGSIZE;
+
+ for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
+ if (!info->tables[i].n_entries)
+ break;
+
+ table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
+ if (!table)
+ goto err_cancel_ports;
+
+ if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
+ info->tables[i].n_entries))
+ goto err_cancel_table;
+
+ if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
+ &info->tables[i].tunnel_types, NULL,
+ __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
+ udp_tunnel_type_names, compact))
+ goto err_cancel_table;
+
+ if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
+ goto err_cancel_table;
+
+ nla_nest_end(skb, table);
+ }
+
+ nla_nest_end(skb, ports);
+
+ return 0;
+
+err_cancel_table:
+ nla_nest_cancel(skb, table);
+err_cancel_ports:
+ nla_nest_cancel(skb, ports);
+ return -EMSGSIZE;
+}
+
+static int
+ethnl_tunnel_info_req_parse(struct ethnl_req_info *req_info,
+ const struct nlmsghdr *nlhdr, struct net *net,
+ struct netlink_ext_ack *extack, bool require_dev)
+{
+ struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1];
+ int ret;
+
+ ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_TUNNEL_INFO_MAX,
+ ethtool_tunnel_info_policy, extack);
+ if (ret < 0)
+ return ret;
+
+ return ethnl_parse_header_dev_get(req_info,
+ tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
+ net, extack, require_dev);
+}
+
+int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ struct ethnl_req_info req_info = {};
+ struct sk_buff *rskb;
+ void *reply_payload;
+ int reply_len;
+ int ret;
+
+ ret = ethnl_tunnel_info_req_parse(&req_info, info->nlhdr,
+ genl_info_net(info), info->extack,
+ true);
+ if (ret < 0)
+ return ret;
+
+ rtnl_lock();
+ ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
+ if (ret < 0)
+ goto err_unlock_rtnl;
+ reply_len = ret + ethnl_reply_header_size();
+
+ rskb = ethnl_reply_init(reply_len, req_info.dev,
+ ETHTOOL_MSG_TUNNEL_INFO_GET,
+ ETHTOOL_A_TUNNEL_INFO_HEADER,
+ info, &reply_payload);
+ if (!rskb) {
+ ret = -ENOMEM;
+ goto err_unlock_rtnl;
+ }
+
+ ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
+ if (ret)
+ goto err_free_msg;
+ rtnl_unlock();
+ dev_put(req_info.dev);
+ genlmsg_end(rskb, reply_payload);
+
+ return genlmsg_reply(rskb, info);
+
+err_free_msg:
+ nlmsg_free(rskb);
+err_unlock_rtnl:
+ rtnl_unlock();
+ dev_put(req_info.dev);
+ return ret;
+}
+
+struct ethnl_tunnel_info_dump_ctx {
+ struct ethnl_req_info req_info;
+ int pos_hash;
+ int pos_idx;
+};
+
+int ethnl_tunnel_info_start(struct netlink_callback *cb)
+{
+ struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
+ int ret;
+
+ BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
+
+ memset(ctx, 0, sizeof(*ctx));
+
+ ret = ethnl_tunnel_info_req_parse(&ctx->req_info, cb->nlh,
+ sock_net(cb->skb->sk), cb->extack,
+ false);
+ if (ctx->req_info.dev) {
+ dev_put(ctx->req_info.dev);
+ ctx->req_info.dev = NULL;
+ }
+
+ return ret;
+}
+
+int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
+ struct net *net = sock_net(skb->sk);
+ int s_idx = ctx->pos_idx;
+ int h, idx = 0;
+ int ret = 0;
+ void *ehdr;
+
+ rtnl_lock();
+ cb->seq = net->dev_base_seq;
+ for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ struct hlist_head *head;
+ struct net_device *dev;
+
+ head = &net->dev_index_head[h];
+ idx = 0;
+ hlist_for_each_entry(dev, head, index_hlist) {
+ if (idx < s_idx)
+ goto cont;
+
+ ehdr = ethnl_dump_put(skb, cb,
+ ETHTOOL_MSG_TUNNEL_INFO_GET);
+ if (!ehdr) {
+ ret = -EMSGSIZE;
+ goto out;
+ }
+
+ ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
+ if (ret < 0) {
+ genlmsg_cancel(skb, ehdr);
+ goto out;
+ }
+
+ ctx->req_info.dev = dev;
+ ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
+ ctx->req_info.dev = NULL;
+ if (ret < 0) {
+ genlmsg_cancel(skb, ehdr);
+ if (ret == -EOPNOTSUPP)
+ goto cont;
+ goto out;
+ }
+ genlmsg_end(skb, ehdr);
+cont:
+ idx++;
+ }
+ }
+out:
+ rtnl_unlock();
+
+ ctx->pos_hash = h;
+ ctx->pos_idx = idx;
+ nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+
+ if (ret == -EMSGSIZE && skb->len)
+ return skb->len;
+ return ret;
+}