libbpf v0.8.0 deprecates the bpf_get_link_xdp_id and bpf_set_link_xdp_fd
functions. Use meson to detect if libbpf >= v0.7.0 is linked and if so, use
the recommended replacement functions bpf_xdp_query_id, bpf_xdp_attach
and bpf_xdp_detach which are available to use since libbpf v0.7.0.
Also prevent linking with libbpf versions > v0.8.0.
Signed-off-by: Ciara Loftus <ciara.lof...@intel.com>
---
doc/guides/nics/af_xdp.rst | 3 ++-
drivers/net/af_xdp/compat.h | 36 ++++++++++++++++++++++++++++-
drivers/net/af_xdp/meson.build | 7 ++----
drivers/net/af_xdp/rte_eth_af_xdp.c | 19 +++------------
4 files changed, 42 insertions(+), 23 deletions(-)
diff --git a/doc/guides/nics/af_xdp.rst b/doc/guides/nics/af_xdp.rst
index 56681c8365..9edb48df67 100644
--- a/doc/guides/nics/af_xdp.rst
+++ b/doc/guides/nics/af_xdp.rst
@@ -43,7 +43,8 @@ Prerequisites
This is a Linux-specific PMD, thus the following prerequisites apply:
* A Linux Kernel (version > v4.18) with XDP sockets configuration enabled;
-* Both libxdp >=v1.2.2 and libbpf libraries installed, or, libbpf <=v0.6.0
+* Both libxdp >=v1.2.2 and libbpf <=v0.8.0 libraries installed, or, libbpf
+ <=v0.6.0.
* If using libxdp, it requires an environment variable called
LIBXDP_OBJECT_PATH to be set to the location of where libxdp placed its bpf
object files. This is usually in /usr/local/lib/bpf or /usr/local/lib64/bpf.
diff --git a/drivers/net/af_xdp/compat.h b/drivers/net/af_xdp/compat.h
index 28ea64aeaa..8f4ac8b5ea 100644
--- a/drivers/net/af_xdp/compat.h
+++ b/drivers/net/af_xdp/compat.h
@@ -60,7 +60,7 @@ tx_syscall_needed(struct xsk_ring_prod *q __rte_unused)
}
#endif
-#ifdef RTE_NET_AF_XDP_LIBBPF_OBJ_OPEN
+#ifdef RTE_NET_AF_XDP_LIBBPF_V070
static int load_program(const char *prog_path, struct bpf_object **obj)
{
struct bpf_program *prog;
@@ -85,6 +85,23 @@ static int load_program(const char *prog_path, struct
bpf_object **obj)
bpf_object__close(*obj);
return -1;
}
+
+static int
+remove_xdp_program(int ifindex)
+{
+ uint32_t curr_prog_id = 0;
+
+ if (bpf_xdp_query_id(ifindex, XDP_FLAGS_UPDATE_IF_NOEXIST,
+ &curr_prog_id))
+ return -1;
+
+ return bpf_xdp_detach(ifindex, XDP_FLAGS_UPDATE_IF_NOEXIST, NULL);
+}
+
+static int link_xdp_prog_with_dev(int ifindex, int fd, __u32 flags)
+{
+ return bpf_xdp_attach(ifindex, fd, flags, NULL);
+}
#else
static int load_program(const char *prog_path, struct bpf_object **obj)
{
@@ -96,4 +113,21 @@ static int load_program(const char *prog_path, struct
bpf_object **obj)
return prog_fd;
}
+
+static int
+remove_xdp_program(int ifindex)
+{
+ uint32_t curr_prog_id = 0;
+
+ if (bpf_get_link_xdp_id(ifindex, &curr_prog_id,
+ XDP_FLAGS_UPDATE_IF_NOEXIST))
+ return -1;
+
+ return bpf_set_link_xdp_fd(ifindex, -1, XDP_FLAGS_UPDATE_IF_NOEXIST);
+}
+
+static int link_xdp_prog_with_dev(int ifindex, int fd, __u32 flags)
+{
+ return bpf_set_link_xdp_fd(ifindex, fd, flags);
+}
#endif
diff --git a/drivers/net/af_xdp/meson.build b/drivers/net/af_xdp/meson.build
index 1e0de23705..349f8e7c12 100644
--- a/drivers/net/af_xdp/meson.build
+++ b/drivers/net/af_xdp/meson.build
@@ -10,10 +10,7 @@ endif
sources = files('rte_eth_af_xdp.c')
xdp_dep = dependency('libxdp', version : '>=1.2.2', required: false, method:
'pkg-config')
-bpf_dep = dependency('libbpf', required: false, method: 'pkg-config')
-if not bpf_dep.found()
- bpf_dep = cc.find_library('bpf', required: false)
-endif
+bpf_dep = dependency('libbpf', version : '<=0.8.0', required: false, method:
'pkg-config')
if cc.has_header('linux/if_xdp.h')
if xdp_dep.found() and cc.has_header('xdp/xsk.h')
@@ -25,7 +22,7 @@ if cc.has_header('linux/if_xdp.h')
bpf_ver_dep = dependency('libbpf', version : '>=0.7.0',
required: false, method: 'pkg-config')
if bpf_ver_dep.found()
- cflags += ['-DRTE_NET_AF_XDP_LIBBPF_OBJ_OPEN']
+ cflags += ['-DRTE_NET_AF_XDP_LIBBPF_V070']
endif
else
build = false
diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c
b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 1e37da6e84..943d5c9838 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -863,20 +863,6 @@ eth_stats_reset(struct rte_eth_dev *dev)
return 0;
}
-static void
-remove_xdp_program(struct pmd_internals *internals)
-{
- uint32_t curr_prog_id = 0;
-
- if (bpf_get_link_xdp_id(internals->if_index, &curr_prog_id,
- XDP_FLAGS_UPDATE_IF_NOEXIST)) {
- AF_XDP_LOG(ERR, "bpf_get_link_xdp_id failed\n");
- return;
- }
- bpf_set_link_xdp_fd(internals->if_index, -1,
- XDP_FLAGS_UPDATE_IF_NOEXIST);
-}
-
static void
xdp_umem_destroy(struct xsk_umem_info *umem)
{
@@ -929,7 +915,8 @@ eth_dev_close(struct rte_eth_dev *dev)
*/
dev->data->mac_addrs = NULL;
- remove_xdp_program(internals);
+ if (remove_xdp_program(internals->if_index))
+ AF_XDP_LOG(ERR, "Error while removing XDP program.\n");
if (internals->shared_umem) {
struct internal_list *list;
@@ -1195,7 +1182,7 @@ load_custom_xdp_prog(const char *prog_path, int if_index,
struct bpf_map **map)
}
/* Link the program with the given network device */
- ret = bpf_set_link_xdp_fd(if_index, prog_fd,
+ ret = link_xdp_prog_with_dev(if_index, prog_fd,
XDP_FLAGS_UPDATE_IF_NOEXIST);
if (ret) {
AF_XDP_LOG(ERR, "Failed to set prog fd %d on interface\n",
--
2.25.1
