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Date: Sat, 14 Jan 2023 16:54:35 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, davem@...emloft.net, kuba@...nel.org,
hawk@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
toke@...hat.com, memxor@...il.com, alardam@...il.com,
saeedm@...dia.com, anthony.l.nguyen@...el.com, gospo@...adcom.com,
vladimir.oltean@....com, nbd@....name, john@...ozen.org,
leon@...nel.org, simon.horman@...igine.com, aelior@...vell.com,
christophe.jaillet@...adoo.fr, ecree.xilinx@...il.com,
mst@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
maciej.fijalkowski@...el.com, intel-wired-lan@...ts.osuosl.org,
lorenzo.bianconi@...hat.com
Subject: [RFC v2 bpf-next 5/7] libbpf: add API to get XDP/XSK supported features
Extend bpf_xdp_query routine in order to get XDP/XSK supported features
of netdev over route netlink interface.
Extend libbpf netlink implementation in order to support netlink_generic
protocol.
Co-developed-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
Co-developed-by: Marek Majtyka <alardam@...il.com>
Signed-off-by: Marek Majtyka <alardam@...il.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
tools/lib/bpf/libbpf.h | 3 +-
tools/lib/bpf/netlink.c | 98 +++++++++++++++++++++++++++++++++++++++++
tools/lib/bpf/nlattr.h | 12 +++++
3 files changed, 112 insertions(+), 1 deletion(-)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 898db26e42e9..29cb7040fa77 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -982,9 +982,10 @@ struct bpf_xdp_query_opts {
__u32 hw_prog_id; /* output */
__u32 skb_prog_id; /* output */
__u8 attach_mode; /* output */
+ __u64 fflags; /* output */
size_t :0;
};
-#define bpf_xdp_query_opts__last_field attach_mode
+#define bpf_xdp_query_opts__last_field fflags
LIBBPF_API int bpf_xdp_attach(int ifindex, int prog_fd, __u32 flags,
const struct bpf_xdp_attach_opts *opts);
diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c
index d2468a04a6c3..66c7e3dbd41f 100644
--- a/tools/lib/bpf/netlink.c
+++ b/tools/lib/bpf/netlink.c
@@ -9,6 +9,7 @@
#include <linux/if_ether.h>
#include <linux/pkt_cls.h>
#include <linux/rtnetlink.h>
+#include <linux/netdev.h>
#include <sys/socket.h>
#include <errno.h>
#include <time.h>
@@ -39,6 +40,12 @@ struct xdp_id_md {
int ifindex;
__u32 flags;
struct xdp_link_info info;
+ __u64 fflags;
+};
+
+struct xdp_features_md {
+ int ifindex;
+ __u64 flags;
};
static int libbpf_netlink_open(__u32 *nl_pid, int proto)
@@ -238,6 +245,42 @@ static int libbpf_netlink_send_recv(struct libbpf_nla_req *req,
return ret;
}
+static int parse_genl_family_id(struct nlmsghdr *nh, libbpf_dump_nlmsg_t fn,
+ void *cookie)
+{
+ struct nlattr *na = (struct nlattr *)(NLMSG_DATA(nh) + GENL_HDRLEN);
+
+ na = (struct nlattr *)((void *)na + NLA_ALIGN(na->nla_len));
+ if (na->nla_type == CTRL_ATTR_FAMILY_ID) {
+ __u16 *id = cookie;
+
+ *id = libbpf_nla_getattr_u16(na);
+ return NL_DONE;
+ }
+
+ return NL_CONT;
+}
+
+static int libbpf_netlink_resolve_genl_family_id(const char *name,
+ __u16 len, __u16 *id)
+{
+ struct libbpf_nla_req req = {
+ .nh.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN),
+ .nh.nlmsg_type = GENL_ID_CTRL,
+ .nh.nlmsg_flags = NLM_F_REQUEST,
+ .gnl.cmd = CTRL_CMD_GETFAMILY,
+ .gnl.version = 1,
+ };
+ int err;
+
+ err = nlattr_add(&req, CTRL_ATTR_FAMILY_NAME, name, len);
+ if (err < 0)
+ return err;
+
+ return libbpf_netlink_send_recv(&req, NETLINK_GENERIC,
+ parse_genl_family_id, NULL, id);
+}
+
static int __bpf_set_link_xdp_fd_replace(int ifindex, int fd, int old_fd,
__u32 flags)
{
@@ -357,6 +400,29 @@ static int get_xdp_info(void *cookie, void *msg, struct nlattr **tb)
return 0;
}
+static int parse_xdp_features(struct nlmsghdr *nh, libbpf_dump_nlmsg_t fn,
+ void *cookie)
+{
+ struct nlattr *na = (struct nlattr *)(NLMSG_DATA(nh) + GENL_HDRLEN);
+ struct xdp_features_md *md = cookie;
+ int ifindex;
+
+ if (na->nla_type != NETDEV_A_DEV_IFINDEX)
+ return NL_CONT;
+
+ ifindex = libbpf_nla_getattr_u32(na);
+ if (ifindex != md->ifindex)
+ return NL_CONT;
+
+ na = (struct nlattr *)((void *)na + NLA_ALIGN(na->nla_len));
+ if (na->nla_type != NETDEV_A_DEV_XDP_FEATURES)
+ return NL_CONT;
+
+ md->flags = libbpf_nla_getattr_u64(na);
+
+ return NL_DONE;
+}
+
int bpf_xdp_query(int ifindex, int xdp_flags, struct bpf_xdp_query_opts *opts)
{
struct libbpf_nla_req req = {
@@ -393,6 +459,38 @@ int bpf_xdp_query(int ifindex, int xdp_flags, struct bpf_xdp_query_opts *opts)
OPTS_SET(opts, skb_prog_id, xdp_id.info.skb_prog_id);
OPTS_SET(opts, attach_mode, xdp_id.info.attach_mode);
+ if (OPTS_HAS(opts, fflags)) {
+ struct xdp_features_md md = {
+ .ifindex = ifindex,
+ };
+ __u16 id;
+
+ err = libbpf_netlink_resolve_genl_family_id("netdev",
+ sizeof("netdev"),
+ &id);
+ if (err < 0)
+ return libbpf_err(err);
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
+ req.nh.nlmsg_flags = NLM_F_REQUEST;
+ req.nh.nlmsg_type = id;
+ req.gnl.cmd = NETDEV_CMD_DEV_GET;
+ req.gnl.version = 1;
+
+ err = nlattr_add(&req, NETDEV_A_DEV_IFINDEX, &ifindex,
+ sizeof(ifindex));
+ if (err < 0)
+ return err;
+
+ err = libbpf_netlink_send_recv(&req, NETLINK_GENERIC,
+ parse_xdp_features, NULL, &md);
+ if (err)
+ return libbpf_err(err);
+
+ opts->fflags = md.flags;
+ }
+
return 0;
}
diff --git a/tools/lib/bpf/nlattr.h b/tools/lib/bpf/nlattr.h
index 4d15ae2ff812..d92d1c1de700 100644
--- a/tools/lib/bpf/nlattr.h
+++ b/tools/lib/bpf/nlattr.h
@@ -14,6 +14,7 @@
#include <errno.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
+#include <linux/genetlink.h>
/* avoid multiple definition of netlink features */
#define __LINUX_NETLINK_H
@@ -58,6 +59,7 @@ struct libbpf_nla_req {
union {
struct ifinfomsg ifinfo;
struct tcmsg tc;
+ struct genlmsghdr gnl;
};
char buf[128];
};
@@ -89,11 +91,21 @@ static inline uint8_t libbpf_nla_getattr_u8(const struct nlattr *nla)
return *(uint8_t *)libbpf_nla_data(nla);
}
+static inline uint16_t libbpf_nla_getattr_u16(const struct nlattr *nla)
+{
+ return *(uint16_t *)libbpf_nla_data(nla);
+}
+
static inline uint32_t libbpf_nla_getattr_u32(const struct nlattr *nla)
{
return *(uint32_t *)libbpf_nla_data(nla);
}
+static inline uint64_t libbpf_nla_getattr_u64(const struct nlattr *nla)
+{
+ return *(uint64_t *)libbpf_nla_data(nla);
+}
+
static inline const char *libbpf_nla_getattr_str(const struct nlattr *nla)
{
return (const char *)libbpf_nla_data(nla);
--
2.39.0
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