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[PATCH v4 4/6] ebpf: Added declaration/initialization routines.

Andrew Melnychenko posted 6 patches 2 years, 7 months ago
Maintainers: Jason Wang <jasowang@redhat.com>, Andrew Melnychenko <andrew@daynix.com>, Yuri Benditovich <yuri.benditovich@daynix.com>, "Michael S. Tsirkin" <mst@redhat.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>, Michael Roth <michael.roth@amd.com>
There is a newer version of this series
[PATCH v4 4/6] ebpf: Added declaration/initialization routines.
Posted by Andrew Melnychenko 2 years, 7 months ago 
Now, the binary objects may be retrieved by id.
It would require for future qmp commands that may require specific
eBPF blob.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
 ebpf/ebpf.c      | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
 ebpf/ebpf.h      | 31 +++++++++++++++++++++
 ebpf/ebpf_rss.c  |  6 +++++
 ebpf/meson.build |  2 +-
 4 files changed, 108 insertions(+), 1 deletion(-)
 create mode 100644 ebpf/ebpf.c
 create mode 100644 ebpf/ebpf.h

diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
new file mode 100644
index 0000000000..ea97c0403e
--- /dev/null
+++ b/ebpf/ebpf.c
@@ -0,0 +1,70 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/queue.h"
+#include "qapi/error.h"
+#include "qapi/qapi-commands-ebpf.h"
+#include "ebpf/ebpf.h"
+
+struct ElfBinaryDataEntry {
+    int id;
+    const void *data;
+    size_t datalen;
+
+    QSLIST_ENTRY(ElfBinaryDataEntry) node;
+};
+
+static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
+                                            QSLIST_HEAD_INITIALIZER();
+
+void ebpf_register_binary_data(int id, const void *data, size_t datalen)
+{
+    struct ElfBinaryDataEntry *dataentry = NULL;
+
+    dataentry = g_new0(struct ElfBinaryDataEntry, 1);
+    dataentry->data = data;
+    dataentry->datalen = datalen;
+    dataentry->id = id;
+
+    QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
+}
+
+const void *ebpf_find_binary_by_id(int id, size_t *sz, Error **errp)
+{
+    struct ElfBinaryDataEntry *it = NULL;
+    QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
+        if (id == it->id) {
+            *sz = it->datalen;
+            return it->data;
+        }
+    }
+
+    error_setg(errp, "can't find eBPF object with id: %d", id);
+
+    return NULL;
+}
+
+EbpfObject *qmp_request_ebpf(EbpfProgramID id, Error **errp)
+{
+    EbpfObject *ret = NULL;
+    size_t size = 0;
+    const void *data = ebpf_find_binary_by_id(id, &size, errp);
+    if (!data) {
+        return NULL;
+    }
+
+    ret = g_new0(EbpfObject, 1);
+    ret->object = g_base64_encode(data, size);
+
+    return ret;
+}
diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
new file mode 100644
index 0000000000..b6266b28b8
--- /dev/null
+++ b/ebpf/ebpf.h
@@ -0,0 +1,31 @@
+/*
+ * QEMU eBPF binary declaration routine.
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#ifndef EBPF_H
+#define EBPF_H
+
+struct Error;
+
+void ebpf_register_binary_data(int id, const void *data,
+                               size_t datalen);
+const void *ebpf_find_binary_by_id(int id, size_t *sz,
+                                   struct Error **errp);
+
+#define ebpf_binary_init(id, fn)                                           \
+static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void)     \
+{                                                                          \
+    size_t datalen = 0;                                                    \
+    const void *data = fn(&datalen);                                       \
+    ebpf_register_binary_data(id, data, datalen);                          \
+}
+
+#endif /* EBPF_H */
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 24bc6cc409..8679dc452d 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -13,6 +13,8 @@
 
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
+#include "qapi/qapi-types-misc.h"
+#include "qapi/qapi-commands-ebpf.h"
 
 #include <bpf/libbpf.h>
 #include <bpf/bpf.h>
@@ -21,6 +23,8 @@
 
 #include "ebpf/ebpf_rss.h"
 #include "ebpf/rss.bpf.skeleton.h"
+#include "ebpf/ebpf.h"
+
 #include "trace.h"
 
 void ebpf_rss_init(struct EBPFRSSContext *ctx)
@@ -261,3 +265,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
     ctx->map_toeplitz_key = -1;
     ctx->map_indirections_table = -1;
 }
+
+ebpf_binary_init(EBPF_PROGRAMID_RSS, rss_bpf__elf_bytes)
diff --git a/ebpf/meson.build b/ebpf/meson.build
index 2f627d6c7d..c9bbaa7c90 100644
--- a/ebpf/meson.build
+++ b/ebpf/meson.build
@@ -1 +1 @@
-system_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
+common_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
\ No newline at end of file
-- 
2.40.1
Re: [PATCH v4 4/6] ebpf: Added declaration/initialization routines.
Posted by Markus Armbruster 2 years, 7 months ago 
Andrew Melnychenko <andrew@daynix.com> writes:

> Now, the binary objects may be retrieved by id.
> It would require for future qmp commands that may require specific
> eBPF blob.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---

[...]

> diff --git a/ebpf/meson.build b/ebpf/meson.build
> index 2f627d6c7d..c9bbaa7c90 100644
> --- a/ebpf/meson.build
> +++ b/ebpf/meson.build
> @@ -1 +1 @@
> -system_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
> +common_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
> \ No newline at end of file

Add a newline, please.
Re: [PATCH v4 4/6] ebpf: Added declaration/initialization routines.
Posted by Markus Armbruster 2 years, 7 months ago 
Andrew Melnychenko <andrew@daynix.com> writes:

> Now, the binary objects may be retrieved by id.
> It would require for future qmp commands that may require specific
> eBPF blob.
>
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>  ebpf/ebpf.c      | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
>  ebpf/ebpf.h      | 31 +++++++++++++++++++++
>  ebpf/ebpf_rss.c  |  6 +++++
>  ebpf/meson.build |  2 +-
>  4 files changed, 108 insertions(+), 1 deletion(-)
>  create mode 100644 ebpf/ebpf.c
>  create mode 100644 ebpf/ebpf.h
>
> diff --git a/ebpf/ebpf.c b/ebpf/ebpf.c
> new file mode 100644
> index 0000000000..ea97c0403e
> --- /dev/null
> +++ b/ebpf/ebpf.c
> @@ -0,0 +1,70 @@
> +/*
> + * QEMU eBPF binary declaration routine.
> + *
> + * Developed by Daynix Computing LTD (http://www.daynix.com)
> + *
> + * Authors:
> + *  Andrew Melnychenko <andrew@daynix.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or
> + * later.  See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/queue.h"
> +#include "qapi/error.h"
> +#include "qapi/qapi-commands-ebpf.h"

Does not compile:

    ../ebpf/ebpf.c:16:10: fatal error: qapi/qapi-commands-ebpf.h: No such file or directory

The header doesn't exist until you add qapi/ebpf.json in the next
commit.

> +#include "ebpf/ebpf.h"
> +
> +struct ElfBinaryDataEntry {
> +    int id;
> +    const void *data;
> +    size_t datalen;
> +
> +    QSLIST_ENTRY(ElfBinaryDataEntry) node;
> +};
> +
> +static QSLIST_HEAD(, ElfBinaryDataEntry) ebpf_elf_obj_list =
> +                                            QSLIST_HEAD_INITIALIZER();
> +
> +void ebpf_register_binary_data(int id, const void *data, size_t datalen)
> +{
> +    struct ElfBinaryDataEntry *dataentry = NULL;
> +
> +    dataentry = g_new0(struct ElfBinaryDataEntry, 1);
> +    dataentry->data = data;
> +    dataentry->datalen = datalen;
> +    dataentry->id = id;
> +
> +    QSLIST_INSERT_HEAD(&ebpf_elf_obj_list, dataentry, node);
> +}
> +
> +const void *ebpf_find_binary_by_id(int id, size_t *sz, Error **errp)
> +{
> +    struct ElfBinaryDataEntry *it = NULL;
> +    QSLIST_FOREACH(it, &ebpf_elf_obj_list, node) {
> +        if (id == it->id) {
> +            *sz = it->datalen;
> +            return it->data;
> +        }
> +    }
> +
> +    error_setg(errp, "can't find eBPF object with id: %d", id);
> +
> +    return NULL;
> +}
> +
> +EbpfObject *qmp_request_ebpf(EbpfProgramID id, Error **errp)
> +{
> +    EbpfObject *ret = NULL;
> +    size_t size = 0;
> +    const void *data = ebpf_find_binary_by_id(id, &size, errp);
> +    if (!data) {
> +        return NULL;
> +    }
> +
> +    ret = g_new0(EbpfObject, 1);
> +    ret->object = g_base64_encode(data, size);
> +
> +    return ret;
> +}
> diff --git a/ebpf/ebpf.h b/ebpf/ebpf.h
> new file mode 100644
> index 0000000000..b6266b28b8
> --- /dev/null
> +++ b/ebpf/ebpf.h
> @@ -0,0 +1,31 @@
> +/*
> + * QEMU eBPF binary declaration routine.
> + *
> + * Developed by Daynix Computing LTD (http://www.daynix.com)
> + *
> + * Authors:
> + *  Andrew Melnychenko <andrew@daynix.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or
> + * later.  See the COPYING file in the top-level directory.
> + */
> +
> +#ifndef EBPF_H
> +#define EBPF_H
> +
> +struct Error;
> +
> +void ebpf_register_binary_data(int id, const void *data,
> +                               size_t datalen);
> +const void *ebpf_find_binary_by_id(int id, size_t *sz,
> +                                   struct Error **errp);
> +
> +#define ebpf_binary_init(id, fn)                                           \
> +static void __attribute__((constructor)) ebpf_binary_init_ ## fn(void)     \
> +{                                                                          \
> +    size_t datalen = 0;                                                    \
> +    const void *data = fn(&datalen);                                       \
> +    ebpf_register_binary_data(id, data, datalen);                          \
> +}
> +
> +#endif /* EBPF_H */
> diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
> index 24bc6cc409..8679dc452d 100644
> --- a/ebpf/ebpf_rss.c
> +++ b/ebpf/ebpf_rss.c
> @@ -13,6 +13,8 @@
>  
>  #include "qemu/osdep.h"
>  #include "qemu/error-report.h"
> +#include "qapi/qapi-types-misc.h"
> +#include "qapi/qapi-commands-ebpf.h"

Likewise.

>  
>  #include <bpf/libbpf.h>
>  #include <bpf/bpf.h>
> @@ -21,6 +23,8 @@
>  
>  #include "ebpf/ebpf_rss.h"
>  #include "ebpf/rss.bpf.skeleton.h"
> +#include "ebpf/ebpf.h"
> +
>  #include "trace.h"
>  
>  void ebpf_rss_init(struct EBPFRSSContext *ctx)
> @@ -261,3 +265,5 @@ void ebpf_rss_unload(struct EBPFRSSContext *ctx)
>      ctx->map_toeplitz_key = -1;
>      ctx->map_indirections_table = -1;
>  }
> +
> +ebpf_binary_init(EBPF_PROGRAMID_RSS, rss_bpf__elf_bytes)
> diff --git a/ebpf/meson.build b/ebpf/meson.build
> index 2f627d6c7d..c9bbaa7c90 100644
> --- a/ebpf/meson.build
> +++ b/ebpf/meson.build
> @@ -1 +1 @@
> -system_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
> +common_ss.add(when: libbpf, if_true: files('ebpf.c', 'ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
> \ No newline at end of file

Patchew 2.1-devel-b67e4c2

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