diff mbox series

[bpf-next,v2,24/31] bpf: iterators: Split iterators.lskel.h into little- and big- endian versions

Message ID 20230128000650.1516334-25-iii@linux.ibm.com (mailing list archive)
State Superseded
Commit 0f0e5f5bd5066c9ffaa006e26fc7d092b04d4088
Delegated to: BPF
Headers show
Series Support bpf trampoline for s390x | expand

Checks

Context Check Description
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netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 14 maintainers not CCed: nathan@kernel.org sdf@google.com fallentree@fb.com kpsingh@kernel.org jolsa@kernel.org ndesaulniers@google.com martin.lau@linux.dev song@kernel.org john.fastabend@gmail.com llvm@lists.linux.dev haoluo@google.com trix@redhat.com pulehui@huawei.com yhs@fb.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch warning CHECK: Please use a blank line after function/struct/union/enum declarations WARNING: Avoid line continuations in quoted strings WARNING: __always_unused or __maybe_unused is preferred over __attribute__((__unused__)) WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-VM_Test-4 success Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-9 success Logs for test_maps on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_maps on aarch64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-12 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-13 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-14 fail Logs for test_progs on aarch64 with gcc
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bpf/vmtest-bpf-next-VM_Test-34 success Logs for test_verifier on aarch64 with gcc
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bpf/vmtest-bpf-next-VM_Test-21 success Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-26 success Logs for test_progs_no_alu32_parallel on s390x with gcc
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Commit Message

Ilya Leoshkevich Jan. 28, 2023, 12:06 a.m. UTC 
iterators.lskel.h is little-endian, therefore bpf iterator is currently
broken on big-endian systems. Introduce a big-endian version and add
instructions regarding its generation. Unfortunately bpftool's
cross-endianness capabilities are limited to BTF right now, so the
procedure requires access to a big-endian machine or a configured
emulator.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 kernel/bpf/preload/bpf_preload_kern.c         |   6 +-
 kernel/bpf/preload/iterators/Makefile         |  12 +-
 kernel/bpf/preload/iterators/README           |   5 +-
 .../iterators/iterators.lskel-big-endian.h    | 419 ++++++++++++++++++
 ...skel.h => iterators.lskel-little-endian.h} |   0
 5 files changed, 435 insertions(+), 7 deletions(-)
 create mode 100644 kernel/bpf/preload/iterators/iterators.lskel-big-endian.h
 rename kernel/bpf/preload/iterators/{iterators.lskel.h => iterators.lskel-little-endian.h} (100%)
diff mbox series

Patch

diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c
index 5106b5372f0c..b56f9f3314fd 100644
--- a/kernel/bpf/preload/bpf_preload_kern.c
+++ b/kernel/bpf/preload/bpf_preload_kern.c
@@ -3,7 +3,11 @@ 
 #include <linux/init.h>
 #include <linux/module.h>
 #include "bpf_preload.h"
-#include "iterators/iterators.lskel.h"
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#include "iterators/iterators.lskel-little-endian.h"
+#else
+#include "iterators/iterators.lskel-big-endian.h"
+#endif
 
 static struct bpf_link *maps_link, *progs_link;
 static struct iterators_bpf *skel;
diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
index 6762b1260f2f..8937dc6bc8d0 100644
--- a/kernel/bpf/preload/iterators/Makefile
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -35,20 +35,22 @@  endif
 
 .PHONY: all clean
 
-all: iterators.lskel.h
+all: iterators.lskel-little-endian.h
+
+big: iterators.lskel-big-endian.h
 
 clean:
 	$(call msg,CLEAN)
 	$(Q)rm -rf $(OUTPUT) iterators
 
-iterators.lskel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
+iterators.lskel-%.h: $(OUTPUT)/%/iterators.bpf.o | $(BPFTOOL)
 	$(call msg,GEN-SKEL,$@)
 	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
 
-
-$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
+$(OUTPUT)/%/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BPF,$@)
-	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
+	$(Q)mkdir -p $(@D)
+	$(Q)$(CLANG) -g -O2 -target bpf -m$* $(INCLUDES)		      \
 		 -c $(filter %.c,$^) -o $@ &&				      \
 	$(LLVM_STRIP) -g $@
 
diff --git a/kernel/bpf/preload/iterators/README b/kernel/bpf/preload/iterators/README
index 7fd6d39a9ad2..98e7c90ea012 100644
--- a/kernel/bpf/preload/iterators/README
+++ b/kernel/bpf/preload/iterators/README
@@ -1,4 +1,7 @@ 
 WARNING:
-If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h".
+If you change "iterators.bpf.c" do "make -j" in this directory to
+rebuild "iterators.lskel-little-endian.h". Then, on a big-endian
+machine, do "make -j big" in this directory to rebuild
+"iterators.lskel-big-endian.h". Commit both resulting headers.
 Make sure to have clang 10 installed.
 See Documentation/bpf/bpf_devel_QA.rst
diff --git a/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h b/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h
new file mode 100644
index 000000000000..ebdc6c0cdb70
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.lskel-big-endian.h
@@ -0,0 +1,419 @@ 
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ITERATORS_BPF_SKEL_H__
+#define __ITERATORS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct iterators_bpf {
+	struct bpf_loader_ctx ctx;
+	struct {
+		struct bpf_map_desc rodata;
+	} maps;
+	struct {
+		struct bpf_prog_desc dump_bpf_map;
+		struct bpf_prog_desc dump_bpf_prog;
+	} progs;
+	struct {
+		int dump_bpf_map_fd;
+		int dump_bpf_prog_fd;
+	} links;
+};
+
+static inline int
+iterators_bpf__dump_bpf_map__attach(struct iterators_bpf *skel)
+{
+	int prog_fd = skel->progs.dump_bpf_map.prog_fd;
+	int fd = skel_link_create(prog_fd, 0, BPF_TRACE_ITER);
+
+	if (fd > 0)
+		skel->links.dump_bpf_map_fd = fd;
+	return fd;
+}
+
+static inline int
+iterators_bpf__dump_bpf_prog__attach(struct iterators_bpf *skel)
+{
+	int prog_fd = skel->progs.dump_bpf_prog.prog_fd;
+	int fd = skel_link_create(prog_fd, 0, BPF_TRACE_ITER);
+
+	if (fd > 0)
+		skel->links.dump_bpf_prog_fd = fd;
+	return fd;
+}
+
+static inline int
+iterators_bpf__attach(struct iterators_bpf *skel)
+{
+	int ret = 0;
+
+	ret = ret < 0 ? ret : iterators_bpf__dump_bpf_map__attach(skel);
+	ret = ret < 0 ? ret : iterators_bpf__dump_bpf_prog__attach(skel);
+	return ret < 0 ? ret : 0;
+}
+
+static inline void
+iterators_bpf__detach(struct iterators_bpf *skel)
+{
+	skel_closenz(skel->links.dump_bpf_map_fd);
+	skel_closenz(skel->links.dump_bpf_prog_fd);
+}
+static void
+iterators_bpf__destroy(struct iterators_bpf *skel)
+{
+	if (!skel)
+		return;
+	iterators_bpf__detach(skel);
+	skel_closenz(skel->progs.dump_bpf_map.prog_fd);
+	skel_closenz(skel->progs.dump_bpf_prog.prog_fd);
+	skel_closenz(skel->maps.rodata.map_fd);
+	skel_free(skel);
+}
+static inline struct iterators_bpf *
+iterators_bpf__open(void)
+{
+	struct iterators_bpf *skel;
+
+	skel = skel_alloc(sizeof(*skel));
+	if (!skel)
+		goto cleanup;
+	skel->ctx.sz = (void *)&skel->links - (void *)skel;
+	return skel;
+cleanup:
+	iterators_bpf__destroy(skel);
+	return NULL;
+}
+
+static inline int
+iterators_bpf__load(struct iterators_bpf *skel)
+{
+	struct bpf_load_and_run_opts opts = {};
+	int err;
+
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = 6008;
+	opts.data = (void *)"\
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+	opts.insns_sz = 2216;
+	opts.insns = (void *)"\
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+\0\0\0\0\0\0\0\x17\x30\x7b\x10\0\0\0\0\0\0\x18\x06\0\0\0\0\0\0\0\0\0\0\0\0\x15\
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+\0\0\x61\x06\0\x08\0\0\0\0\x18\x16\0\0\0\0\0\0\0\0\0\0\0\0\x16\xe8\x63\x10\0\0\
+\0\0\0\0\x61\x06\0\x0c\0\0\0\0\x18\x16\0\0\0\0\0\0\0\0\0\0\0\0\x16\xec\x63\x10\
+\0\0\0\0\0\0\x79\x06\0\x10\0\0\0\0\x18\x16\0\0\0\0\0\0\0\0\0\0\0\0\x16\xf0\x7b\
+\x10\0\0\0\0\0\0\x61\x0a\xff\x78\0\0\0\0\x18\x16\0\0\0\0\0\0\0\0\0\0\0\0\x17\
+\x18\x63\x10\0\0\0\0\0\0\x18\x16\0\0\0\0\0\0\0\0\0\0\0\0\x17\x60\xb7\x20\0\0\0\
+\0\0\x12\xb7\x30\0\0\0\0\0\x0c\xb7\x40\0\0\0\0\0\0\x85\0\0\0\0\0\0\xa7\xbf\x70\
+\0\0\0\0\0\0\xc5\x70\xff\x13\0\0\0\0\x18\x06\0\0\0\0\0\0\0\0\0\0\0\0\x16\xd0\
+\x63\x07\0\x6c\0\0\0\0\x77\x70\0\0\0\0\0\x20\x63\x07\0\x70\0\0\0\0\xb7\x10\0\0\
+\0\0\0\x05\x18\x26\0\0\0\0\0\0\0\0\0\0\0\0\x16\xd0\xb7\x30\0\0\0\0\0\x8c\x85\0\
+\0\0\0\0\0\xa6\xbf\x70\0\0\0\0\0\0\x18\x06\0\0\0\0\0\0\0\0\0\0\0\0\x17\x40\x61\
+\x10\0\0\0\0\0\0\xd5\x10\0\x02\0\0\0\0\xbf\x91\0\0\0\0\0\0\x85\0\0\0\0\0\0\xa8\
+\xc5\x70\xff\x01\0\0\0\0\x63\xa7\xff\x84\0\0\0\0\x61\x1a\xff\x78\0\0\0\0\xd5\
+\x10\0\x02\0\0\0\0\xbf\x91\0\0\0\0\0\0\x85\0\0\0\0\0\0\xa8\x61\x0a\xff\x80\0\0\
+\0\0\x63\x60\0\x28\0\0\0\0\x61\x0a\xff\x84\0\0\0\0\x63\x60\0\x2c\0\0\0\0\x18\
+\x16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x01\0\0\0\0\0\0\x63\x60\0\x18\0\0\0\0\xb7\
+\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+	err = bpf_load_and_run(&opts);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static inline struct iterators_bpf *
+iterators_bpf__open_and_load(void)
+{
+	struct iterators_bpf *skel;
+
+	skel = iterators_bpf__open();
+	if (!skel)
+		return NULL;
+	if (iterators_bpf__load(skel)) {
+		iterators_bpf__destroy(skel);
+		return NULL;
+	}
+	return skel;
+}
+
+__attribute__((unused)) static void
+iterators_bpf__assert(struct iterators_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ITERATORS_BPF_SKEL_H__ */
diff --git a/kernel/bpf/preload/iterators/iterators.lskel.h b/kernel/bpf/preload/iterators/iterators.lskel-little-endian.h
similarity index 100%
rename from kernel/bpf/preload/iterators/iterators.lskel.h
rename to kernel/bpf/preload/iterators/iterators.lskel-little-endian.h