diff mbox series

[net,v2,2/2] bpf: selftests: send packet to devmap redirect XDP

Message ID 20240906-devel-koalo-fix-ingress-ifindex-v2-2-4caa12c644b4@linutronix.de (mailing list archive)
State New
Headers show
Series bpf: devmap: provide rxq after redirect | expand

Commit Message

Florian Kauer Sept. 6, 2024, 2:16 p.m. UTC 
The current xdp_devmap_attach test attaches a program
that redirects to another program via devmap.

It is, however, never executed, so do that to catch
any bugs that might occur during execution.

Also, execute the same for a veth pair so that we
also cover the non-generic path.

Warning: Running this without the bugfix in this series
will likely crash your system.

Signed-off-by: Florian Kauer <florian.kauer@linutronix.de>
---
 .../selftests/bpf/prog_tests/xdp_devmap_attach.c   | 114 +++++++++++++++++++--
 1 file changed, 108 insertions(+), 6 deletions(-)

Comments

Stanislav Fomichev Sept. 6, 2024, 8:24 p.m. UTC | #1 
On 09/06, Florian Kauer wrote:
> The current xdp_devmap_attach test attaches a program
> that redirects to another program via devmap.
> 
> It is, however, never executed, so do that to catch
> any bugs that might occur during execution.
> 
> Also, execute the same for a veth pair so that we
> also cover the non-generic path.
> 
> Warning: Running this without the bugfix in this series
> will likely crash your system.
> 
> Signed-off-by: Florian Kauer <florian.kauer@linutronix.de>
> ---
>  .../selftests/bpf/prog_tests/xdp_devmap_attach.c   | 114 +++++++++++++++++++--
>  1 file changed, 108 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> index ce6812558287..c9034f8ae63b 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> @@ -1,6 +1,9 @@
>  // SPDX-License-Identifier: GPL-2.0
> +#include <arpa/inet.h>
>  #include <uapi/linux/bpf.h>
>  #include <linux/if_link.h>
> +#include <network_helpers.h>
> +#include <net/if.h>
>  #include <test_progs.h>
>  
>  #include "test_xdp_devmap_helpers.skel.h"
> @@ -17,7 +20,7 @@ static void test_xdp_with_devmap_helpers(void)
>  		.ifindex = IFINDEX_LO,
>  	};
>  	__u32 len = sizeof(info);
> -	int err, dm_fd, map_fd;
> +	int err, dm_fd, dm_fd_redir, map_fd;
>  	__u32 idx = 0;
>  
>  
> @@ -25,14 +28,11 @@ static void test_xdp_with_devmap_helpers(void)
>  	if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
>  		return;
>  
> -	dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
> -	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
> +	dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog);
> +	err = bpf_xdp_attach(IFINDEX_LO, dm_fd_redir, XDP_FLAGS_SKB_MODE, NULL);
>  	if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap"))
>  		goto out_close;
>  
> -	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
> -	ASSERT_OK(err, "XDP program detach");
> -
>  	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
>  	map_fd = bpf_map__fd(skel->maps.dm_ports);
>  	err = bpf_prog_get_info_by_fd(dm_fd, &info, &len);
> @@ -47,6 +47,23 @@ static void test_xdp_with_devmap_helpers(void)
>  	ASSERT_OK(err, "Read devmap entry");
>  	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");
>  
> +	/* send a packet to trigger any potential bugs in there */
> +	char data[10] = {};
> +	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
> +			    .data_in = &data,
> +			    .data_size_in = 10,
> +			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
> +			    .repeat = 1,
> +		);
> +	err = bpf_prog_test_run_opts(dm_fd_redir, &opts);
> +	ASSERT_OK(err, "XDP test run");
> +
> +	/* wait for the packets to be flushed */
> +	kern_sync_rcu();
> +
> +	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
> +	ASSERT_OK(err, "XDP program detach");
> +
>  	/* can not attach BPF_XDP_DEVMAP program to a device */
>  	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
>  	if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program"))
> @@ -124,6 +141,88 @@ static void test_xdp_with_devmap_frags_helpers(void)
>  	test_xdp_with_devmap_frags_helpers__destroy(skel);
>  }
>  
> +static void test_xdp_with_devmap_helpers_veth(void)
> +{
> +	struct test_xdp_with_devmap_helpers *skel;

skel needs to be initialized to NULL ....

> +	struct bpf_prog_info info = {};
> +	struct bpf_devmap_val val = {};
> +	struct nstoken *nstoken = NULL;
> +	__u32 len = sizeof(info);
> +	int err, dm_fd, dm_fd_redir, map_fd, ifindex_dst;
> +	__u32 idx = 0;
> +
> +	SYS(out_close, "ip netns add testns");
> +	nstoken = open_netns("testns");
> +	if (!ASSERT_OK_PTR(nstoken, "setns"))
> +		goto out_close;

... for this goto to not do test_xdp_with_devmap_helpers__destroy(garbage)

pw-bot: cr
Stanislav Fomichev Sept. 6, 2024, 8:46 p.m. UTC | #2 
On 09/06, Stanislav Fomichev wrote:
> On 09/06, Florian Kauer wrote:
> > The current xdp_devmap_attach test attaches a program
> > that redirects to another program via devmap.
> > 
> > It is, however, never executed, so do that to catch
> > any bugs that might occur during execution.
> > 
> > Also, execute the same for a veth pair so that we
> > also cover the non-generic path.
> > 
> > Warning: Running this without the bugfix in this series
> > will likely crash your system.
> > 
> > Signed-off-by: Florian Kauer <florian.kauer@linutronix.de>
> > ---
> >  .../selftests/bpf/prog_tests/xdp_devmap_attach.c   | 114 +++++++++++++++++++--
> >  1 file changed, 108 insertions(+), 6 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> > index ce6812558287..c9034f8ae63b 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> > @@ -1,6 +1,9 @@
> >  // SPDX-License-Identifier: GPL-2.0
> > +#include <arpa/inet.h>
> >  #include <uapi/linux/bpf.h>
> >  #include <linux/if_link.h>
> > +#include <network_helpers.h>
> > +#include <net/if.h>
> >  #include <test_progs.h>
> >  
> >  #include "test_xdp_devmap_helpers.skel.h"
> > @@ -17,7 +20,7 @@ static void test_xdp_with_devmap_helpers(void)
> >  		.ifindex = IFINDEX_LO,
> >  	};
> >  	__u32 len = sizeof(info);
> > -	int err, dm_fd, map_fd;
> > +	int err, dm_fd, dm_fd_redir, map_fd;
> >  	__u32 idx = 0;
> >  
> >  
> > @@ -25,14 +28,11 @@ static void test_xdp_with_devmap_helpers(void)
> >  	if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
> >  		return;
> >  
> > -	dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
> > -	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
> > +	dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog);
> > +	err = bpf_xdp_attach(IFINDEX_LO, dm_fd_redir, XDP_FLAGS_SKB_MODE, NULL);
> >  	if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap"))
> >  		goto out_close;
> >  
> > -	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
> > -	ASSERT_OK(err, "XDP program detach");
> > -
> >  	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
> >  	map_fd = bpf_map__fd(skel->maps.dm_ports);
> >  	err = bpf_prog_get_info_by_fd(dm_fd, &info, &len);
> > @@ -47,6 +47,23 @@ static void test_xdp_with_devmap_helpers(void)
> >  	ASSERT_OK(err, "Read devmap entry");
> >  	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");
> >  
> > +	/* send a packet to trigger any potential bugs in there */
> > +	char data[10] = {};
> > +	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
> > +			    .data_in = &data,
> > +			    .data_size_in = 10,
> > +			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
> > +			    .repeat = 1,
> > +		);
> > +	err = bpf_prog_test_run_opts(dm_fd_redir, &opts);
> > +	ASSERT_OK(err, "XDP test run");
> > +
> > +	/* wait for the packets to be flushed */
> > +	kern_sync_rcu();
> > +
> > +	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
> > +	ASSERT_OK(err, "XDP program detach");
> > +
> >  	/* can not attach BPF_XDP_DEVMAP program to a device */
> >  	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
> >  	if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program"))
> > @@ -124,6 +141,88 @@ static void test_xdp_with_devmap_frags_helpers(void)
> >  	test_xdp_with_devmap_frags_helpers__destroy(skel);
> >  }
> >  
> > +static void test_xdp_with_devmap_helpers_veth(void)
> > +{
> > +	struct test_xdp_with_devmap_helpers *skel;
> 
> skel needs to be initialized to NULL ....
> 
> > +	struct bpf_prog_info info = {};
> > +	struct bpf_devmap_val val = {};
> > +	struct nstoken *nstoken = NULL;
> > +	__u32 len = sizeof(info);
> > +	int err, dm_fd, dm_fd_redir, map_fd, ifindex_dst;
> > +	__u32 idx = 0;
> > +
> > +	SYS(out_close, "ip netns add testns");
> > +	nstoken = open_netns("testns");
> > +	if (!ASSERT_OK_PTR(nstoken, "setns"))
> > +		goto out_close;
> 
> ... for this goto to not do test_xdp_with_devmap_helpers__destroy(garbage)
> 
> pw-bot: cr

Ignore everything below and sorry for the spam.
(NIPA doesn't like DKIM on my sdf@fomichev.me, let's see whether it
works from plain gmail.com)

pw-bot: cr
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
index ce6812558287..c9034f8ae63b 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
@@ -1,6 +1,9 @@ 
 // SPDX-License-Identifier: GPL-2.0
+#include <arpa/inet.h>
 #include <uapi/linux/bpf.h>
 #include <linux/if_link.h>
+#include <network_helpers.h>
+#include <net/if.h>
 #include <test_progs.h>
 
 #include "test_xdp_devmap_helpers.skel.h"
@@ -17,7 +20,7 @@  static void test_xdp_with_devmap_helpers(void)
 		.ifindex = IFINDEX_LO,
 	};
 	__u32 len = sizeof(info);
-	int err, dm_fd, map_fd;
+	int err, dm_fd, dm_fd_redir, map_fd;
 	__u32 idx = 0;
 
 
@@ -25,14 +28,11 @@  static void test_xdp_with_devmap_helpers(void)
 	if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
 		return;
 
-	dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
-	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
+	dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog);
+	err = bpf_xdp_attach(IFINDEX_LO, dm_fd_redir, XDP_FLAGS_SKB_MODE, NULL);
 	if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap"))
 		goto out_close;
 
-	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
-	ASSERT_OK(err, "XDP program detach");
-
 	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
 	map_fd = bpf_map__fd(skel->maps.dm_ports);
 	err = bpf_prog_get_info_by_fd(dm_fd, &info, &len);
@@ -47,6 +47,23 @@  static void test_xdp_with_devmap_helpers(void)
 	ASSERT_OK(err, "Read devmap entry");
 	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");
 
+	/* send a packet to trigger any potential bugs in there */
+	char data[10] = {};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
+			    .data_in = &data,
+			    .data_size_in = 10,
+			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
+			    .repeat = 1,
+		);
+	err = bpf_prog_test_run_opts(dm_fd_redir, &opts);
+	ASSERT_OK(err, "XDP test run");
+
+	/* wait for the packets to be flushed */
+	kern_sync_rcu();
+
+	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
+	ASSERT_OK(err, "XDP program detach");
+
 	/* can not attach BPF_XDP_DEVMAP program to a device */
 	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
 	if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program"))
@@ -124,6 +141,88 @@  static void test_xdp_with_devmap_frags_helpers(void)
 	test_xdp_with_devmap_frags_helpers__destroy(skel);
 }
 
+static void test_xdp_with_devmap_helpers_veth(void)
+{
+	struct test_xdp_with_devmap_helpers *skel;
+	struct bpf_prog_info info = {};
+	struct bpf_devmap_val val = {};
+	struct nstoken *nstoken = NULL;
+	__u32 len = sizeof(info);
+	int err, dm_fd, dm_fd_redir, map_fd, ifindex_dst;
+	__u32 idx = 0;
+
+	SYS(out_close, "ip netns add testns");
+	nstoken = open_netns("testns");
+	if (!ASSERT_OK_PTR(nstoken, "setns"))
+		goto out_close;
+
+	SYS(out_close, "ip link add veth_src type veth peer name veth_dst");
+	SYS(out_close, "ip link set dev veth_src up");
+	SYS(out_close, "ip link set dev veth_dst up");
+
+	val.ifindex = if_nametoindex("veth_src");
+	ifindex_dst = if_nametoindex("veth_dst");
+	if (!ASSERT_NEQ(val.ifindex, 0, "val.ifindex") ||
+	    !ASSERT_NEQ(ifindex_dst, 0, "ifindex_dst"))
+		goto out_close;
+
+	skel = test_xdp_with_devmap_helpers__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
+		return;
+
+	dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog);
+	err = bpf_xdp_attach(val.ifindex, dm_fd_redir, XDP_FLAGS_DRV_MODE, NULL);
+	if (!ASSERT_OK(err, "Attach of program with 8-byte devmap"))
+		goto out_close;
+
+	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
+	map_fd = bpf_map__fd(skel->maps.dm_ports);
+	err = bpf_prog_get_info_by_fd(dm_fd, &info, &len);
+	if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
+		goto out_close;
+
+	val.bpf_prog.fd = dm_fd;
+	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
+	ASSERT_OK(err, "Add program to devmap entry");
+
+	err = bpf_map_lookup_elem(map_fd, &idx, &val);
+	ASSERT_OK(err, "Read devmap entry");
+	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");
+
+	/* attach dummy to other side to enable reception */
+	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
+	err = bpf_xdp_attach(ifindex_dst, dm_fd, XDP_FLAGS_DRV_MODE, NULL);
+	if (!ASSERT_OK(err, "Attach of dummy XDP"))
+		goto out_close;
+
+	/* send a packet to trigger any potential bugs in there */
+	char data[10] = {};
+	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
+			    .data_in = &data,
+			    .data_size_in = 10,
+			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
+			    .repeat = 1,
+		);
+	err = bpf_prog_test_run_opts(dm_fd_redir, &opts);
+	ASSERT_OK(err, "XDP test run");
+
+	/* wait for the packets to be flushed */
+	kern_sync_rcu();
+
+	err = bpf_xdp_detach(val.ifindex, XDP_FLAGS_DRV_MODE, NULL);
+	ASSERT_OK(err, "XDP program detach");
+
+	err = bpf_xdp_detach(ifindex_dst, XDP_FLAGS_DRV_MODE, NULL);
+	ASSERT_OK(err, "XDP program detach");
+
+out_close:
+	if (nstoken)
+		close_netns(nstoken);
+	SYS_NOFAIL("ip netns del testns");
+
+	test_xdp_with_devmap_helpers__destroy(skel);
+}
+
 void serial_test_xdp_devmap_attach(void)
 {
 	if (test__start_subtest("DEVMAP with programs in entries"))
@@ -134,4 +233,7 @@  void serial_test_xdp_devmap_attach(void)
 
 	if (test__start_subtest("Verifier check of DEVMAP programs"))
 		test_neg_xdp_devmap_helpers();
+
+	if (test__start_subtest("DEVMAP with programs in entries on veth"))
+		test_xdp_with_devmap_helpers_veth();
 }