[Intel-wired-lan] [PATCH 7/8] libbpf: add API to get XSK/XDP caps
alardam at gmail.com
alardam at gmail.com
Mon Nov 16 09:34:51 UTC 2020
From: Marek Majtyka <marekx.majtyka at intel.com>
Add public xsk API to read supported XDP functions of a netdev:
- XDP driver mode (SKB, DRV),
- XSK bind mode (COPY, ZEROCOPY).
Signed-off-by: Marek Majtyka <marekx.majtyka at intel.com>
---
tools/lib/bpf/libbpf.map | 1 +
tools/lib/bpf/xsk.c | 51 +++++++++++++++++++++++++++++++++++++++-
tools/lib/bpf/xsk.h | 3 ++-
3 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 29ff4807b909..0867dd078a65 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -345,4 +345,5 @@ LIBBPF_0.3.0 {
btf__parse_split;
btf__new_empty_split;
btf__new_split;
+ xsk_socket__get_caps;
} LIBBPF_0.2.0;
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 7951f7ea6db3..433c58fbed68 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -15,7 +15,6 @@
#include <arpa/inet.h>
#include <asm/barrier.h>
#include <linux/compiler.h>
-#include <linux/ethtool.h>
#include <linux/filter.h>
#include <linux/if_ether.h>
#include <linux/if_link.h>
@@ -31,6 +30,7 @@
#include <sys/types.h>
#include "bpf.h"
+#include "ethtool.h"
#include "libbpf.h"
#include "libbpf_internal.h"
#include "xsk.h"
@@ -931,3 +931,52 @@ void xsk_socket__delete(struct xsk_socket *xsk)
close(xsk->fd);
free(xsk);
}
+
+int xsk_socket__get_caps(const char *ifname, __u32 *xdp_caps, __u16 *bind_caps)
+{
+ struct ethnl_params param;
+ int ret;
+
+ if (!xdp_caps || !bind_caps || !ifname ||
+ (strnlen(ifname, IFNAMSIZ) >= IFNAMSIZ))
+ return -EINVAL;
+
+ param.nl_family = ETHTOOL_GENL_NAME;
+ param.xdp_zc_flags = 0;
+ param.ifname = ifname;
+ param.xdp_flags = 0;
+
+ /* First, get the netlink family id */
+ ret = libbpf_ethnl_get_ethtool_family_id(¶m);
+ if (ret)
+ return ret;
+
+ /* Second, get number of features */
+ param.features = 0;
+ ret = libbpf_ethnl_get_netdev_features(¶m);
+ if (ret)
+ return ret;
+
+ /* Third, get the features description */
+ ret = libbpf_ethnl_get_netdev_features(¶m);
+ if (ret)
+ return ret;
+
+ *xdp_caps = XDP_FLAGS_SKB_MODE;
+ *bind_caps = XDP_COPY;
+
+ if (param.xdp_idx == -1 || param.xdp_zc_idx == -1)
+ return 0;
+
+ /* Finally, get features flags and process it */
+ ret = libbpf_ethnl_get_active_bits(¶m);
+ if (!ret) {
+ if (param.xdp_flags) {
+ *xdp_caps |= XDP_FLAGS_DRV_MODE;
+ if (param.xdp_zc_flags)
+ *bind_caps |= XDP_ZEROCOPY;
+ }
+ }
+
+ return ret;
+}
diff --git a/tools/lib/bpf/xsk.h b/tools/lib/bpf/xsk.h
index 1069c46364ff..ae29004570b2 100644
--- a/tools/lib/bpf/xsk.h
+++ b/tools/lib/bpf/xsk.h
@@ -247,7 +247,8 @@ xsk_socket__create_shared(struct xsk_socket **xsk_ptr,
/* Returns 0 for success and -EBUSY if the umem is still in use. */
LIBBPF_API int xsk_umem__delete(struct xsk_umem *umem);
LIBBPF_API void xsk_socket__delete(struct xsk_socket *xsk);
-
+LIBBPF_API int xsk_socket__get_caps(const char *ifname, __u32 *xdp_caps,
+ __u16 *bind_caps);
#ifdef __cplusplus
} /* extern "C" */
#endif
--
2.20.1
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