[PATCH] ebpf: fix compatibility with libbpf 1.0+

Shreesh Adiga posted 1 patch 1 year, 4 months ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20221218143927.597975-1-16567adigashreesh@gmail.com
Maintainers: Jason Wang <jasowang@redhat.com>, Andrew Melnychenko <andrew@daynix.com>, Yuri Benditovich <yuri.benditovich@daynix.com>
ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
tools/ebpf/Makefile.ebpf |    8 +-
tools/ebpf/rss.bpf.c     |   43 +-
3 files changed, 891 insertions(+), 331 deletions(-)
[PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Shreesh Adiga 1 year, 4 months ago
The current implementation fails to load on a system with
libbpf 1.0 and reports that legacy map definitions in 'maps'
section are not supported by libbpf v1.0+. This commit updates
the Makefile to add BTF (-g flag) and appropriately updates
the maps in rss.bpf.c and update the skeleton file in repo.

Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
---
 ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
 tools/ebpf/Makefile.ebpf |    8 +-
 tools/ebpf/rss.bpf.c     |   43 +-
 3 files changed, 891 insertions(+), 331 deletions(-)

diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
index 126683eb87..18eb2adb12 100644
--- a/ebpf/rss.bpf.skeleton.h
+++ b/ebpf/rss.bpf.skeleton.h
@@ -1,9 +1,10 @@
 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
 
-/* THIS FILE IS AUTOGENERATED! */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
 #ifndef __RSS_BPF_SKEL_H__
 #define __RSS_BPF_SKEL_H__
 
+#include <errno.h>
 #include <stdlib.h>
 #include <bpf/libbpf.h>
 
@@ -12,8 +13,8 @@ struct rss_bpf {
 	struct bpf_object *obj;
 	struct {
 		struct bpf_map *tap_rss_map_configurations;
-		struct bpf_map *tap_rss_map_indirection_table;
 		struct bpf_map *tap_rss_map_toeplitz_key;
+		struct bpf_map *tap_rss_map_indirection_table;
 	} maps;
 	struct {
 		struct bpf_program *tun_rss_steering_prog;
@@ -21,6 +22,16 @@ struct rss_bpf {
 	struct {
 		struct bpf_link *tun_rss_steering_prog;
 	} links;
+
+#ifdef __cplusplus
+	static inline struct rss_bpf *open(const struct bpf_object_open_opts *opts = nullptr);
+	static inline struct rss_bpf *open_and_load();
+	static inline int load(struct rss_bpf *skel);
+	static inline int attach(struct rss_bpf *skel);
+	static inline void detach(struct rss_bpf *skel);
+	static inline void destroy(struct rss_bpf *skel);
+	static inline const void *elf_bytes(size_t *sz);
+#endif /* __cplusplus */
 };
 
 static void
@@ -40,18 +51,26 @@ static inline struct rss_bpf *
 rss_bpf__open_opts(const struct bpf_object_open_opts *opts)
 {
 	struct rss_bpf *obj;
+	int err;
 
 	obj = (struct rss_bpf *)calloc(1, sizeof(*obj));
-	if (!obj)
+	if (!obj) {
+		errno = ENOMEM;
 		return NULL;
-	if (rss_bpf__create_skeleton(obj))
-		goto err;
-	if (bpf_object__open_skeleton(obj->skeleton, opts))
-		goto err;
+	}
+
+	err = rss_bpf__create_skeleton(obj);
+	if (err)
+		goto err_out;
+
+	err = bpf_object__open_skeleton(obj->skeleton, opts);
+	if (err)
+		goto err_out;
 
 	return obj;
-err:
+err_out:
 	rss_bpf__destroy(obj);
+	errno = -err;
 	return NULL;
 }
 
@@ -71,12 +90,15 @@ static inline struct rss_bpf *
 rss_bpf__open_and_load(void)
 {
 	struct rss_bpf *obj;
+	int err;
 
 	obj = rss_bpf__open();
 	if (!obj)
 		return NULL;
-	if (rss_bpf__load(obj)) {
+	err = rss_bpf__load(obj);
+	if (err) {
 		rss_bpf__destroy(obj);
+		errno = -err;
 		return NULL;
 	}
 	return obj;
@@ -91,18 +113,22 @@ rss_bpf__attach(struct rss_bpf *obj)
 static inline void
 rss_bpf__detach(struct rss_bpf *obj)
 {
-	return bpf_object__detach_skeleton(obj->skeleton);
+	bpf_object__detach_skeleton(obj->skeleton);
 }
 
+static inline const void *rss_bpf__elf_bytes(size_t *sz);
+
 static inline int
 rss_bpf__create_skeleton(struct rss_bpf *obj)
 {
 	struct bpf_object_skeleton *s;
+	int err;
 
 	s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));
-	if (!s)
-		return -1;
-	obj->skeleton = s;
+	if (!s)	{
+		err = -ENOMEM;
+		goto err;
+	}
 
 	s->sz = sizeof(*s);
 	s->name = "rss_bpf";
@@ -112,320 +138,855 @@ rss_bpf__create_skeleton(struct rss_bpf *obj)
 	s->map_cnt = 3;
 	s->map_skel_sz = sizeof(*s->maps);
 	s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);
-	if (!s->maps)
+	if (!s->maps) {
+		err = -ENOMEM;
 		goto err;
+	}
 
 	s->maps[0].name = "tap_rss_map_configurations";
 	s->maps[0].map = &obj->maps.tap_rss_map_configurations;
 
-	s->maps[1].name = "tap_rss_map_indirection_table";
-	s->maps[1].map = &obj->maps.tap_rss_map_indirection_table;
+	s->maps[1].name = "tap_rss_map_toeplitz_key";
+	s->maps[1].map = &obj->maps.tap_rss_map_toeplitz_key;
 
-	s->maps[2].name = "tap_rss_map_toeplitz_key";
-	s->maps[2].map = &obj->maps.tap_rss_map_toeplitz_key;
+	s->maps[2].name = "tap_rss_map_indirection_table";
+	s->maps[2].map = &obj->maps.tap_rss_map_indirection_table;
 
 	/* programs */
 	s->prog_cnt = 1;
 	s->prog_skel_sz = sizeof(*s->progs);
 	s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);
-	if (!s->progs)
+	if (!s->progs) {
+		err = -ENOMEM;
 		goto err;
+	}
 
 	s->progs[0].name = "tun_rss_steering_prog";
 	s->progs[0].prog = &obj->progs.tun_rss_steering_prog;
 	s->progs[0].link = &obj->links.tun_rss_steering_prog;
 
-	s->data_sz = 8088;
-	s->data = (void *)"\
+	s->data = (void *)rss_bpf__elf_bytes(&s->data_sz);
+
+	obj->skeleton = s;
+	return 0;
+err:
+	bpf_object__destroy_skeleton(s);
+	return err;
+}
+
+static inline const void *rss_bpf__elf_bytes(size_t *sz)
+{
+	*sz = 20440;
+	return (const void *)"\
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+}
 
-	return 0;
-err:
-	bpf_object__destroy_skeleton(s);
-	return -1;
+#ifdef __cplusplus
+struct rss_bpf *rss_bpf::open(const struct bpf_object_open_opts *opts) { return rss_bpf__open_opts(opts); }
+struct rss_bpf *rss_bpf::open_and_load() { return rss_bpf__open_and_load(); }
+int rss_bpf::load(struct rss_bpf *skel) { return rss_bpf__load(skel); }
+int rss_bpf::attach(struct rss_bpf *skel) { return rss_bpf__attach(skel); }
+void rss_bpf::detach(struct rss_bpf *skel) { rss_bpf__detach(skel); }
+void rss_bpf::destroy(struct rss_bpf *skel) { rss_bpf__destroy(skel); }
+const void *rss_bpf::elf_bytes(size_t *sz) { return rss_bpf__elf_bytes(sz); }
+#endif /* __cplusplus */
+
+__attribute__((unused)) static void
+rss_bpf__assert(struct rss_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
 }
 
 #endif /* __RSS_BPF_SKEL_H__ */
diff --git a/tools/ebpf/Makefile.ebpf b/tools/ebpf/Makefile.ebpf
index 8f327ae3b8..3391e7ce08 100755
--- a/tools/ebpf/Makefile.ebpf
+++ b/tools/ebpf/Makefile.ebpf
@@ -1,9 +1,9 @@
 OBJS = rss.bpf.o
 
-LLC ?= llc
+LLVM_STRIP ?= llvm-strip
 CLANG ?= clang
 INC_FLAGS = `$(CLANG) -print-file-name=include`
-EXTRA_CFLAGS ?= -O2 -emit-llvm -fno-stack-protector
+EXTRA_CFLAGS ?= -O2 -g -target bpf
 
 all: $(OBJS)
 
@@ -11,11 +11,13 @@ all: $(OBJS)
 
 clean:
 	rm -f $(OBJS)
+	rm -f rss.bpf.skeleton.h
 
 $(OBJS):  %.o:%.c
 	$(CLANG) $(INC_FLAGS) \
                 -D__KERNEL__ -D__ASM_SYSREG_H \
                 -I../include $(LINUXINCLUDE) \
-                $(EXTRA_CFLAGS) -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
+                $(EXTRA_CFLAGS) -c $< -o $@
+	$(LLVM_STRIP) -g $@
 	bpftool gen skeleton rss.bpf.o > rss.bpf.skeleton.h
 	cp rss.bpf.skeleton.h ../../ebpf/
diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index e85ec55f9b..20f227e2ac 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -76,29 +76,26 @@ struct packet_hash_info_t {
     };
 };
 
-struct bpf_map_def SEC("maps")
-tap_rss_map_configurations = {
-        .type        = BPF_MAP_TYPE_ARRAY,
-        .key_size    = sizeof(__u32),
-        .value_size  = sizeof(struct rss_config_t),
-        .max_entries = 1,
-};
-
-struct bpf_map_def SEC("maps")
-tap_rss_map_toeplitz_key = {
-        .type        = BPF_MAP_TYPE_ARRAY,
-        .key_size    = sizeof(__u32),
-        .value_size  = sizeof(struct toeplitz_key_data_t),
-        .max_entries = 1,
-};
-
-struct bpf_map_def SEC("maps")
-tap_rss_map_indirection_table = {
-        .type        = BPF_MAP_TYPE_ARRAY,
-        .key_size    = sizeof(__u32),
-        .value_size  = sizeof(__u16),
-        .max_entries = INDIRECTION_TABLE_SIZE,
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_ARRAY);
+    __uint(key_size, sizeof(__u32));
+    __uint(value_size, sizeof(struct rss_config_t));
+    __uint(max_entries, 1);
+} tap_rss_map_configurations SEC(".maps");
+
+struct {
+    __uint(type, BPF_MAP_TYPE_ARRAY);
+    __uint(key_size, sizeof(__u32));
+    __uint(value_size, sizeof(struct toeplitz_key_data_t));
+    __uint(max_entries, 1);
+} tap_rss_map_toeplitz_key SEC(".maps");
+
+struct {
+    __uint(type, BPF_MAP_TYPE_ARRAY);
+    __uint(key_size, sizeof(__u32));
+    __uint(value_size, sizeof(__u16));
+    __uint(max_entries, INDIRECTION_TABLE_SIZE);
+} tap_rss_map_indirection_table SEC(".maps");
 
 static inline void net_rx_rss_add_chunk(__u8 *rss_input, size_t *bytes_written,
                                         const void *ptr, size_t size) {
-- 
2.39.0
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Daniel P. Berrangé 1 year, 4 months ago
On Sun, Dec 18, 2022 at 08:09:27PM +0530, Shreesh Adiga wrote:
> The current implementation fails to load on a system with
> libbpf 1.0 and reports that legacy map definitions in 'maps'
> section are not supported by libbpf v1.0+. This commit updates
> the Makefile to add BTF (-g flag) and appropriately updates
> the maps in rss.bpf.c and update the skeleton file in repo.

Can you split this into two pieces - one updating the build
system for new compiler usage, and one updating the program
to remove the legacy map defs.


With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
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Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Shreesh Adiga 1 year, 4 months ago
Hi Daniel,

On Mon, Dec 19, 2022 at 10:56:57AM +0000, Daniel P. Berrangé wrote:
> On Sun, Dec 18, 2022 at 08:09:27PM +0530, Shreesh Adiga wrote:
> > The current implementation fails to load on a system with
> > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > section are not supported by libbpf v1.0+. This commit updates
> > the Makefile to add BTF (-g flag) and appropriately updates
> > the maps in rss.bpf.c and update the skeleton file in repo.
>
> Can you split this into two pieces - one updating the build
> system for new compiler usage, and one updating the program
> to remove the legacy map defs.
>
If I just update the Makefile first, rss.bpf.c doesn't compile
and throws error:
rss.bpf.c:80:1: error: variable has incomplete type 'struct bpf_map_def'

Similarly if first rss.bpf.c only is updated, then error is thrown:
libbpf: BTF is required, but is missing or corrupted
Hence, it would seem logical to update both of them together in same
commit.

Do you mean first commit should update the Makefile and rss.bpf.c
together and second commit should be updating the rss.bpf.skeleton.h
file? I was under the impression that every commit should result in
compilable sources, hence wanted to clarify this.

Thanks,
Shreesh
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Daniel P. Berrangé 1 year, 4 months ago
On Mon, Dec 19, 2022 at 07:14:54PM +0530, Shreesh Adiga wrote:
> Hi Daniel,
> 
> On Mon, Dec 19, 2022 at 10:56:57AM +0000, Daniel P. Berrangé wrote:
> > On Sun, Dec 18, 2022 at 08:09:27PM +0530, Shreesh Adiga wrote:
> > > The current implementation fails to load on a system with
> > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > section are not supported by libbpf v1.0+. This commit updates
> > > the Makefile to add BTF (-g flag) and appropriately updates
> > > the maps in rss.bpf.c and update the skeleton file in repo.
> >
> > Can you split this into two pieces - one updating the build
> > system for new compiler usage, and one updating the program
> > to remove the legacy map defs.
> >
> If I just update the Makefile first, rss.bpf.c doesn't compile
> and throws error:
> rss.bpf.c:80:1: error: variable has incomplete type 'struct bpf_map_def'
> 
> Similarly if first rss.bpf.c only is updated, then error is thrown:
> libbpf: BTF is required, but is missing or corrupted
> Hence, it would seem logical to update both of them together in same
> commit.
> 
> Do you mean first commit should update the Makefile and rss.bpf.c
> together and second commit should be updating the rss.bpf.skeleton.h
> file? I was under the impression that every commit should result in
> compilable sources, hence wanted to clarify this.

Yes, it must be compilable. I was under the impression from the
commit that these were independant changes, but I was wrong.


With regards,
Daniel
-- 
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Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Shreesh Adiga 1 year, 4 months ago
On Mon, Dec 19, 2022 at 01:49:37PM +0000, Daniel P. Berrangé wrote:
> On Mon, Dec 19, 2022 at 07:14:54PM +0530, Shreesh Adiga wrote:
> > Hi Daniel,
> >
> > On Mon, Dec 19, 2022 at 10:56:57AM +0000, Daniel P. Berrangé wrote:
> > > On Sun, Dec 18, 2022 at 08:09:27PM +0530, Shreesh Adiga wrote:
> > > > The current implementation fails to load on a system with
> > > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > > section are not supported by libbpf v1.0+. This commit updates
> > > > the Makefile to add BTF (-g flag) and appropriately updates
> > > > the maps in rss.bpf.c and update the skeleton file in repo.
> > >
> > > Can you split this into two pieces - one updating the build
> > > system for new compiler usage, and one updating the program
> > > to remove the legacy map defs.
> > >
> > If I just update the Makefile first, rss.bpf.c doesn't compile
> > and throws error:
> > rss.bpf.c:80:1: error: variable has incomplete type 'struct bpf_map_def'
> >
> > Similarly if first rss.bpf.c only is updated, then error is thrown:
> > libbpf: BTF is required, but is missing or corrupted
> > Hence, it would seem logical to update both of them together in same
> > commit.
> >
> > Do you mean first commit should update the Makefile and rss.bpf.c
> > together and second commit should be updating the rss.bpf.skeleton.h
> > file? I was under the impression that every commit should result in
> > compilable sources, hence wanted to clarify this.
>
> Yes, it must be compilable. I was under the impression from the
> commit that these were independant changes, but I was wrong.
>
Could you please confirm if the current single patch is good enough for
submission, or do I need to send a v2 series with changes split into
two commits, one for Makefile + rss.bpf.c and second one for skeleton
file update?

Thanks,
Shreesh
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Daniel P. Berrangé 1 year, 4 months ago
On Tue, Dec 20, 2022 at 07:32:47PM +0530, Shreesh Adiga wrote:
> On Mon, Dec 19, 2022 at 01:49:37PM +0000, Daniel P. Berrangé wrote:
> > On Mon, Dec 19, 2022 at 07:14:54PM +0530, Shreesh Adiga wrote:
> > > Hi Daniel,
> > >
> > > On Mon, Dec 19, 2022 at 10:56:57AM +0000, Daniel P. Berrangé wrote:
> > > > On Sun, Dec 18, 2022 at 08:09:27PM +0530, Shreesh Adiga wrote:
> > > > > The current implementation fails to load on a system with
> > > > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > > > section are not supported by libbpf v1.0+. This commit updates
> > > > > the Makefile to add BTF (-g flag) and appropriately updates
> > > > > the maps in rss.bpf.c and update the skeleton file in repo.
> > > >
> > > > Can you split this into two pieces - one updating the build
> > > > system for new compiler usage, and one updating the program
> > > > to remove the legacy map defs.
> > > >
> > > If I just update the Makefile first, rss.bpf.c doesn't compile
> > > and throws error:
> > > rss.bpf.c:80:1: error: variable has incomplete type 'struct bpf_map_def'
> > >
> > > Similarly if first rss.bpf.c only is updated, then error is thrown:
> > > libbpf: BTF is required, but is missing or corrupted
> > > Hence, it would seem logical to update both of them together in same
> > > commit.
> > >
> > > Do you mean first commit should update the Makefile and rss.bpf.c
> > > together and second commit should be updating the rss.bpf.skeleton.h
> > > file? I was under the impression that every commit should result in
> > > compilable sources, hence wanted to clarify this.
> >
> > Yes, it must be compilable. I was under the impression from the
> > commit that these were independant changes, but I was wrong.
> >
> Could you please confirm if the current single patch is good enough for
> submission, or do I need to send a v2 series with changes split into
> two commits, one for Makefile + rss.bpf.c and second one for skeleton
> file update?

Fine as is.

With regards,
Daniel
-- 
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Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Philippe Mathieu-Daudé 1 year, 4 months ago
Hi,

On 18/12/22 15:39, Shreesh Adiga wrote:
> The current implementation fails to load on a system with
> libbpf 1.0 and reports that legacy map definitions in 'maps'
> section are not supported by libbpf v1.0+. This commit updates
> the Makefile to add BTF (-g flag) and appropriately updates
> the maps in rss.bpf.c and update the skeleton file in repo.
> 
> Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
> ---
>   ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
>   tools/ebpf/Makefile.ebpf |    8 +-
>   tools/ebpf/rss.bpf.c     |   43 +-
>   3 files changed, 891 insertions(+), 331 deletions(-)


> +static inline const void *rss_bpf__elf_bytes(size_t *sz)
> +{
> +	*sz = 20440;
> +	return (const void *)"\
>   \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> -\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
> -\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
> -\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> +\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
> +\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
> +\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
>   \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
> -\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
> -\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
> -\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> -\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
> -\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
> -\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
> -\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
> -\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
> -\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> -\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x81\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
> +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
> +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
> +\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> +\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
> +\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
> +\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
> +\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
> +\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
> +\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
[...]

Can we have a build system step which generates this file and compare
with what is committed in the repository that we can run in our CI?

That would avoid the need of human review of this blob.

Thanks,

Phil.
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Shreesh Adiga 1 year, 4 months ago
On Sun, Dec 18, 2022 at 05:15:04PM +0100, Philippe Mathieu-Daudé wrote:
> Hi,
>
> On 18/12/22 15:39, Shreesh Adiga wrote:
> > The current implementation fails to load on a system with
> > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > section are not supported by libbpf v1.0+. This commit updates
> > the Makefile to add BTF (-g flag) and appropriately updates
> > the maps in rss.bpf.c and update the skeleton file in repo.
> >
> > Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
> > ---
> >   ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
> >   tools/ebpf/Makefile.ebpf |    8 +-
> >   tools/ebpf/rss.bpf.c     |   43 +-
> >   3 files changed, 891 insertions(+), 331 deletions(-)
>
>
> > +static inline const void *rss_bpf__elf_bytes(size_t *sz)
> > +{
> > +	*sz = 20440;
> > +	return (const void *)"\
> >   \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> > -\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
> > -\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
> > -\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > +\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
> > +\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
> > +\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> >   \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
> > -\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
> > -\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
> > -\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > -\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
> > -\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
> > -\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
> > -\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
> > -\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
> > -\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > -\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x81\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
> > +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
> > +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
> > +\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > +\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
> > +\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
> > +\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
> > +\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
> > +\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
> > +\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> [...]
>
> Can we have a build system step which generates this file and compare
> with what is committed in the repository that we can run in our CI?
>
> That would avoid the need of human review of this blob.
>
Here are the steps to verify:
Pull latest archlinux/archlinux docker image and get a bash shell inside
the container. Install the required toolchain packages.
pacman -Syu --noconfirm
pacman -S --noconfirm  bpf libbpf llvm clang make

Confirm the versions:
clang 14.0.6
bpftool 7.0.0
libbpf 1.0.1

After this, ensure that the files Makefile.ebpf and rss.bpf.c from this
patch exist at /home/shreesh/c/qemu/tools/ebpf/ inside the docker.
This path seems to be important since BTF info seems to contain the absolute
path of rss.bpf.c which was compiled by clang and is embedded inside
the generated ELF object.

Run `make -C /home/shreesh/c/qemu/tools/ebpf -f Makefile.ebpf` and
verify that `sha256sum /home/shreesh/c/qemu/tools/ebpf/rss.bpf.skeleton.h` is
a54af3d1fb401ddd56c151f00ae20d6557e965c0a1a4d8ed5f8d925457158a0e which
should be the same as the one submitted as part of this patch.

I'm not familiar with QEMU's CI and am not sure if the above steps can
be converted into build system steps. However it should be doable by a
human and verify that the generated skeleton file is correct and not
tampered with.

Regards,
Shreesh
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Andrew Melnichenko 1 year, 4 months ago
Hi, it's a good idea to update the skeleton generation. Technically
skeleton generation is not a part of Qemu building. The skeleton is
already presented in the Qemu tree, so we skip dependencies from
clang/bpftool.
It's a good idea to have an updated bpf program and simplified
Makefile with Qemu sources. And the skeleton in the Qemu tree should
be identical to what the Makefile.ebpf would generate.
I think having one patch with all changes to eBPF RSS is acceptable.

On Tue, Dec 20, 2022 at 6:30 PM Shreesh Adiga
<16567adigashreesh@gmail.com> wrote:
>
> On Sun, Dec 18, 2022 at 05:15:04PM +0100, Philippe Mathieu-Daudé wrote:
> > Hi,
> >
> > On 18/12/22 15:39, Shreesh Adiga wrote:
> > > The current implementation fails to load on a system with
> > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > section are not supported by libbpf v1.0+. This commit updates
> > > the Makefile to add BTF (-g flag) and appropriately updates
> > > the maps in rss.bpf.c and update the skeleton file in repo.
> > >
> > > Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
> > > ---
> > >   ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
> > >   tools/ebpf/Makefile.ebpf |    8 +-
> > >   tools/ebpf/rss.bpf.c     |   43 +-
> > >   3 files changed, 891 insertions(+), 331 deletions(-)
> >
> >
> > > +static inline const void *rss_bpf__elf_bytes(size_t *sz)
> > > +{
> > > +   *sz = 20440;
> > > +   return (const void *)"\
> > >   \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> > > -\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
> > > -\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
> > > -\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > > +\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
> > > +\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
> > > +\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > >   \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
> > > -\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
> > > -\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
> > > -\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > -\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
> > > -\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
> > > -\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
> > > -\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
> > > -\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
> > > -\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > > -\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x81\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
> > > +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
> > > +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
> > > +\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > +\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
> > > +\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
> > > +\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
> > > +\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
> > > +\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
> > > +\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > [...]
> >
> > Can we have a build system step which generates this file and compare
> > with what is committed in the repository that we can run in our CI?
> >
> > That would avoid the need of human review of this blob.
> >
> Here are the steps to verify:
> Pull latest archlinux/archlinux docker image and get a bash shell inside
> the container. Install the required toolchain packages.
> pacman -Syu --noconfirm
> pacman -S --noconfirm  bpf libbpf llvm clang make
>
> Confirm the versions:
> clang 14.0.6
> bpftool 7.0.0
> libbpf 1.0.1
>
> After this, ensure that the files Makefile.ebpf and rss.bpf.c from this
> patch exist at /home/shreesh/c/qemu/tools/ebpf/ inside the docker.
> This path seems to be important since BTF info seems to contain the absolute
> path of rss.bpf.c which was compiled by clang and is embedded inside
> the generated ELF object.
>
> Run `make -C /home/shreesh/c/qemu/tools/ebpf -f Makefile.ebpf` and
> verify that `sha256sum /home/shreesh/c/qemu/tools/ebpf/rss.bpf.skeleton.h` is
> a54af3d1fb401ddd56c151f00ae20d6557e965c0a1a4d8ed5f8d925457158a0e which
> should be the same as the one submitted as part of this patch.
>
> I'm not familiar with QEMU's CI and am not sure if the above steps can
> be converted into build system steps. However it should be doable by a
> human and verify that the generated skeleton file is correct and not
> tampered with.
>
> Regards,
> Shreesh
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Andrew Melnichenko 1 year, 2 months ago
Hi, all.
In the future, there would be eBPF RSS + the helper for Libvirt interaction.
And those patches are required for future work. Technically they are
required for the current builds with linked libbpf 1.01.
Can we apply this patch?


On Wed, Dec 28, 2022 at 6:19 PM Andrew Melnichenko <andrew@daynix.com> wrote:
>
> Hi, it's a good idea to update the skeleton generation. Technically
> skeleton generation is not a part of Qemu building. The skeleton is
> already presented in the Qemu tree, so we skip dependencies from
> clang/bpftool.
> It's a good idea to have an updated bpf program and simplified
> Makefile with Qemu sources. And the skeleton in the Qemu tree should
> be identical to what the Makefile.ebpf would generate.
> I think having one patch with all changes to eBPF RSS is acceptable.
>
> On Tue, Dec 20, 2022 at 6:30 PM Shreesh Adiga
> <16567adigashreesh@gmail.com> wrote:
> >
> > On Sun, Dec 18, 2022 at 05:15:04PM +0100, Philippe Mathieu-Daudé wrote:
> > > Hi,
> > >
> > > On 18/12/22 15:39, Shreesh Adiga wrote:
> > > > The current implementation fails to load on a system with
> > > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > > section are not supported by libbpf v1.0+. This commit updates
> > > > the Makefile to add BTF (-g flag) and appropriately updates
> > > > the maps in rss.bpf.c and update the skeleton file in repo.
> > > >
> > > > Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
> > > > ---
> > > >   ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
> > > >   tools/ebpf/Makefile.ebpf |    8 +-
> > > >   tools/ebpf/rss.bpf.c     |   43 +-
> > > >   3 files changed, 891 insertions(+), 331 deletions(-)
> > >
> > >
> > > > +static inline const void *rss_bpf__elf_bytes(size_t *sz)
> > > > +{
> > > > +   *sz = 20440;
> > > > +   return (const void *)"\
> > > >   \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> > > > -\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
> > > > -\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
> > > > -\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > > > +\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
> > > > +\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
> > > > +\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > > >   \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
> > > > -\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
> > > > -\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
> > > > -\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > > -\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
> > > > -\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
> > > > -\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
> > > > -\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
> > > > -\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
> > > > -\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > > > -\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x81\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
> > > > +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
> > > > +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
> > > > +\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > > +\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
> > > > +\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
> > > > +\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
> > > > +\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
> > > > +\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
> > > > +\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > > [...]
> > >
> > > Can we have a build system step which generates this file and compare
> > > with what is committed in the repository that we can run in our CI?
> > >
> > > That would avoid the need of human review of this blob.
> > >
> > Here are the steps to verify:
> > Pull latest archlinux/archlinux docker image and get a bash shell inside
> > the container. Install the required toolchain packages.
> > pacman -Syu --noconfirm
> > pacman -S --noconfirm  bpf libbpf llvm clang make
> >
> > Confirm the versions:
> > clang 14.0.6
> > bpftool 7.0.0
> > libbpf 1.0.1
> >
> > After this, ensure that the files Makefile.ebpf and rss.bpf.c from this
> > patch exist at /home/shreesh/c/qemu/tools/ebpf/ inside the docker.
> > This path seems to be important since BTF info seems to contain the absolute
> > path of rss.bpf.c which was compiled by clang and is embedded inside
> > the generated ELF object.
> >
> > Run `make -C /home/shreesh/c/qemu/tools/ebpf -f Makefile.ebpf` and
> > verify that `sha256sum /home/shreesh/c/qemu/tools/ebpf/rss.bpf.skeleton.h` is
> > a54af3d1fb401ddd56c151f00ae20d6557e965c0a1a4d8ed5f8d925457158a0e which
> > should be the same as the one submitted as part of this patch.
> >
> > I'm not familiar with QEMU's CI and am not sure if the above steps can
> > be converted into build system steps. However it should be doable by a
> > human and verify that the generated skeleton file is correct and not
> > tampered with.
> >
> > Regards,
> > Shreesh
Re: [PATCH] ebpf: fix compatibility with libbpf 1.0+
Posted by Jason Wang 1 year, 2 months ago
On Wed, Feb 15, 2023 at 4:27 AM Andrew Melnichenko <andrew@daynix.com> wrote:
>
> Hi, all.
> In the future, there would be eBPF RSS + the helper for Libvirt interaction.
> And those patches are required for future work. Technically they are
> required for the current builds with linked libbpf 1.01.
> Can we apply this patch?
>

I've queued this.

Thanks

>
> On Wed, Dec 28, 2022 at 6:19 PM Andrew Melnichenko <andrew@daynix.com> wrote:
> >
> > Hi, it's a good idea to update the skeleton generation. Technically
> > skeleton generation is not a part of Qemu building. The skeleton is
> > already presented in the Qemu tree, so we skip dependencies from
> > clang/bpftool.
> > It's a good idea to have an updated bpf program and simplified
> > Makefile with Qemu sources. And the skeleton in the Qemu tree should
> > be identical to what the Makefile.ebpf would generate.
> > I think having one patch with all changes to eBPF RSS is acceptable.
> >
> > On Tue, Dec 20, 2022 at 6:30 PM Shreesh Adiga
> > <16567adigashreesh@gmail.com> wrote:
> > >
> > > On Sun, Dec 18, 2022 at 05:15:04PM +0100, Philippe Mathieu-Daudé wrote:
> > > > Hi,
> > > >
> > > > On 18/12/22 15:39, Shreesh Adiga wrote:
> > > > > The current implementation fails to load on a system with
> > > > > libbpf 1.0 and reports that legacy map definitions in 'maps'
> > > > > section are not supported by libbpf v1.0+. This commit updates
> > > > > the Makefile to add BTF (-g flag) and appropriately updates
> > > > > the maps in rss.bpf.c and update the skeleton file in repo.
> > > > >
> > > > > Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.com>
> > > > > ---
> > > > >   ebpf/rss.bpf.skeleton.h  | 1171 ++++++++++++++++++++++++++++----------
> > > > >   tools/ebpf/Makefile.ebpf |    8 +-
> > > > >   tools/ebpf/rss.bpf.c     |   43 +-
> > > > >   3 files changed, 891 insertions(+), 331 deletions(-)
> > > >
> > > >
> > > > > +static inline const void *rss_bpf__elf_bytes(size_t *sz)
> > > > > +{
> > > > > +   *sz = 20440;
> > > > > +   return (const void *)"\
> > > > >   \x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\
> > > > > -\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\
> > > > > -\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\
> > > > > -\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > > > > +\0\0\0\0\0\0\0\0\0\0\0\x98\x4c\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0d\0\
> > > > > +\x01\0\xbf\x19\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x54\xff\0\0\0\0\xbf\xa7\
> > > > > +\0\0\0\0\0\0\x07\x07\0\0\x54\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
> > > > >   \xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\
> > > > > -\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\
> > > > > -\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\
> > > > > -\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > > > -\0\x5d\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc0\xff\0\0\0\0\x7b\x1a\xb8\xff\
> > > > > -\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\0\x7b\x1a\xa0\xff\0\0\0\
> > > > > -\0\x63\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\x1a\x88\xff\0\0\0\0\x7b\
> > > > > -\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\x70\xff\0\0\0\0\x7b\x1a\
> > > > > -\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\xff\0\0\0\0\x7b\x1a\x50\
> > > > > -\xff\0\0\0\0\x15\x08\x4c\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > > > > -\0\x07\x03\0\0\xd0\xff\xff\xff\xbf\x81\0\0\0\0\0\0\xb7\x02\0\0\x0c\0\0\0\xb7\
> > > > > +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x08\0\0\0\0\0\0\
> > > > > +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x67\x02\0\0\0\0\xbf\x87\0\0\
> > > > > +\0\0\0\0\x15\x07\x65\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\
> > > > > +\0\x5e\x02\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\xc8\xff\0\0\0\0\x7b\x1a\xc0\xff\
> > > > > +\0\0\0\0\x7b\x1a\xb8\xff\0\0\0\0\x7b\x1a\xb0\xff\0\0\0\0\x7b\x1a\xa8\xff\0\0\0\
> > > > > +\0\x63\x1a\xa0\xff\0\0\0\0\x7b\x1a\x98\xff\0\0\0\0\x7b\x1a\x90\xff\0\0\0\0\x7b\
> > > > > +\x1a\x88\xff\0\0\0\0\x7b\x1a\x80\xff\0\0\0\0\x7b\x1a\x78\xff\0\0\0\0\x7b\x1a\
> > > > > +\x70\xff\0\0\0\0\x7b\x1a\x68\xff\0\0\0\0\x7b\x1a\x60\xff\0\0\0\0\x7b\x1a\x58\
> > > > > +\xff\0\0\0\0\x15\x09\x4d\x02\0\0\0\0\x6b\x1a\xd0\xff\0\0\0\0\xbf\xa3\0\0\0\0\0\
> > > > [...]
> > > >
> > > > Can we have a build system step which generates this file and compare
> > > > with what is committed in the repository that we can run in our CI?
> > > >
> > > > That would avoid the need of human review of this blob.
> > > >
> > > Here are the steps to verify:
> > > Pull latest archlinux/archlinux docker image and get a bash shell inside
> > > the container. Install the required toolchain packages.
> > > pacman -Syu --noconfirm
> > > pacman -S --noconfirm  bpf libbpf llvm clang make
> > >
> > > Confirm the versions:
> > > clang 14.0.6
> > > bpftool 7.0.0
> > > libbpf 1.0.1
> > >
> > > After this, ensure that the files Makefile.ebpf and rss.bpf.c from this
> > > patch exist at /home/shreesh/c/qemu/tools/ebpf/ inside the docker.
> > > This path seems to be important since BTF info seems to contain the absolute
> > > path of rss.bpf.c which was compiled by clang and is embedded inside
> > > the generated ELF object.
> > >
> > > Run `make -C /home/shreesh/c/qemu/tools/ebpf -f Makefile.ebpf` and
> > > verify that `sha256sum /home/shreesh/c/qemu/tools/ebpf/rss.bpf.skeleton.h` is
> > > a54af3d1fb401ddd56c151f00ae20d6557e965c0a1a4d8ed5f8d925457158a0e which
> > > should be the same as the one submitted as part of this patch.
> > >
> > > I'm not familiar with QEMU's CI and am not sure if the above steps can
> > > be converted into build system steps. However it should be doable by a
> > > human and verify that the generated skeleton file is correct and not
> > > tampered with.
> > >
> > > Regards,
> > > Shreesh
>