Merge remote-tracking branch 'remotes/jasowang/tags/net-pull-request' into staging

# gpg: Signature made Fri 04 Jun 2021 08:26:16 BST
# gpg:                using RSA key EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* remotes/jasowang/tags/net-pull-request:
  MAINTAINERS: Added eBPF maintainers information.
  docs: Added eBPF documentation.
  virtio-net: Added eBPF RSS to virtio-net.
  ebpf: Added eBPF RSS loader.
  ebpf: Added eBPF RSS program.
  net: Added SetSteeringEBPF method for NetClientState.
  net/tap: Added TUNSETSTEERINGEBPF code.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

7 files changed, 686 insertions, 0 deletions

diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c
new file mode 100644
index 0000000000..e71e229190
--- /dev/null
+++ b/ebpf/ebpf_rss-stub.c
@@ -0,0 +1,40 @@
+/*
+ * eBPF RSS stub file
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "ebpf/ebpf_rss.h"
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx)
+{
+
+}
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
+{
+    return false;
+}
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx)
+{
+    return false;
+}
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+                      uint16_t *indirections_table, uint8_t *toeplitz_key)
+{
+    return false;
+}
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx)
+{
+
+}
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
new file mode 100644
index 0000000000..118c68da83
--- /dev/null
+++ b/ebpf/ebpf_rss.c
@@ -0,0 +1,165 @@
+/*
+ * eBPF RSS loader
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *  Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+
+#include "hw/virtio/virtio-net.h" /* VIRTIO_NET_RSS_MAX_TABLE_LEN */
+
+#include "ebpf/ebpf_rss.h"
+#include "ebpf/rss.bpf.skeleton.h"
+#include "trace.h"
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx)
+{
+    if (ctx != NULL) {
+        ctx->obj = NULL;
+    }
+}
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
+{
+    return ctx != NULL && ctx->obj != NULL;
+}
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx)
+{
+    struct rss_bpf *rss_bpf_ctx;
+
+    if (ctx == NULL) {
+        return false;
+    }
+
+    rss_bpf_ctx = rss_bpf__open();
+    if (rss_bpf_ctx == NULL) {
+        trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object");
+        goto error;
+    }
+
+    bpf_program__set_socket_filter(rss_bpf_ctx->progs.tun_rss_steering_prog);
+
+    if (rss_bpf__load(rss_bpf_ctx)) {
+        trace_ebpf_error("eBPF RSS", "can not load RSS program");
+        goto error;
+    }
+
+    ctx->obj = rss_bpf_ctx;
+    ctx->program_fd = bpf_program__fd(
+            rss_bpf_ctx->progs.tun_rss_steering_prog);
+    ctx->map_configuration = bpf_map__fd(
+            rss_bpf_ctx->maps.tap_rss_map_configurations);
+    ctx->map_indirections_table = bpf_map__fd(
+            rss_bpf_ctx->maps.tap_rss_map_indirection_table);
+    ctx->map_toeplitz_key = bpf_map__fd(
+            rss_bpf_ctx->maps.tap_rss_map_toeplitz_key);
+
+    return true;
+error:
+    rss_bpf__destroy(rss_bpf_ctx);
+    ctx->obj = NULL;
+
+    return false;
+}
+
+static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
+                                struct EBPFRSSConfig *config)
+{
+    uint32_t map_key = 0;
+
+    if (!ebpf_rss_is_loaded(ctx)) {
+        return false;
+    }
+    if (bpf_map_update_elem(ctx->map_configuration,
+                            &map_key, config, 0) < 0) {
+        return false;
+    }
+    return true;
+}
+
+static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
+                                            uint16_t *indirections_table,
+                                            size_t len)
+{
+    uint32_t i = 0;
+
+    if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
+       len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
+        return false;
+    }
+
+    for (; i < len; ++i) {
+        if (bpf_map_update_elem(ctx->map_indirections_table, &i,
+                                indirections_table + i, 0) < 0) {
+            return false;
+        }
+    }
+    return true;
+}
+
+static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
+                                     uint8_t *toeplitz_key)
+{
+    uint32_t map_key = 0;
+
+    /* prepare toeplitz key */
+    uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
+
+    if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL) {
+        return false;
+    }
+    memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
+    *(uint32_t *)toe = ntohl(*(uint32_t *)toe);
+
+    if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe,
+                            0) < 0) {
+        return false;
+    }
+    return true;
+}
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+                      uint16_t *indirections_table, uint8_t *toeplitz_key)
+{
+    if (!ebpf_rss_is_loaded(ctx) || config == NULL ||
+        indirections_table == NULL || toeplitz_key == NULL) {
+        return false;
+    }
+
+    if (!ebpf_rss_set_config(ctx, config)) {
+        return false;
+    }
+
+    if (!ebpf_rss_set_indirections_table(ctx, indirections_table,
+                                      config->indirections_len)) {
+        return false;
+    }
+
+    if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) {
+        return false;
+    }
+
+    return true;
+}
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx)
+{
+    if (!ebpf_rss_is_loaded(ctx)) {
+        return;
+    }
+
+    rss_bpf__destroy(ctx->obj);
+    ctx->obj = NULL;
+}
diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h
new file mode 100644
index 0000000000..bf3f2572c7
--- /dev/null
+++ b/ebpf/ebpf_rss.h
@@ -0,0 +1,44 @@
+/*
+ * eBPF RSS header
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Authors:
+ *  Andrew Melnychenko <andrew@daynix.com>
+ *  Yuri Benditovich <yuri.benditovich@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_EBPF_RSS_H
+#define QEMU_EBPF_RSS_H
+
+struct EBPFRSSContext {
+    void *obj;
+    int program_fd;
+    int map_configuration;
+    int map_toeplitz_key;
+    int map_indirections_table;
+};
+
+struct EBPFRSSConfig {
+    uint8_t redirect;
+    uint8_t populate_hash;
+    uint32_t hash_types;
+    uint16_t indirections_len;
+    uint16_t default_queue;
+} __attribute__((packed));
+
+void ebpf_rss_init(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_load(struct EBPFRSSContext *ctx);
+
+bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
+                      uint16_t *indirections_table, uint8_t *toeplitz_key);
+
+void ebpf_rss_unload(struct EBPFRSSContext *ctx);
+
+#endif /* QEMU_EBPF_RSS_H */
diff --git a/ebpf/meson.build b/ebpf/meson.build
new file mode 100644
index 0000000000..9cd0635370
--- /dev/null
+++ b/ebpf/meson.build
@@ -0,0 +1 @@
+common_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c'))
diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h
new file mode 100644
index 0000000000..126683eb87
--- /dev/null
+++ b/ebpf/rss.bpf.skeleton.h
@@ -0,0 +1,431 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+/* THIS FILE IS AUTOGENERATED! */
+#ifndef __RSS_BPF_SKEL_H__
+#define __RSS_BPF_SKEL_H__
+
+#include <stdlib.h>
+#include <bpf/libbpf.h>
+
+struct rss_bpf {
+	struct bpf_object_skeleton *skeleton;
+	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;
+	} maps;
+	struct {
+		struct bpf_program *tun_rss_steering_prog;
+	} progs;
+	struct {
+		struct bpf_link *tun_rss_steering_prog;
+	} links;
+};
+
+static void
+rss_bpf__destroy(struct rss_bpf *obj)
+{
+	if (!obj)
+		return;
+	if (obj->skeleton)
+		bpf_object__destroy_skeleton(obj->skeleton);
+	free(obj);
+}
+
+static inline int
+rss_bpf__create_skeleton(struct rss_bpf *obj);
+
+static inline struct rss_bpf *
+rss_bpf__open_opts(const struct bpf_object_open_opts *opts)
+{
+	struct rss_bpf *obj;
+
+	obj = (struct rss_bpf *)calloc(1, sizeof(*obj));
+	if (!obj)
+		return NULL;
+	if (rss_bpf__create_skeleton(obj))
+		goto err;
+	if (bpf_object__open_skeleton(obj->skeleton, opts))
+		goto err;
+
+	return obj;
+err:
+	rss_bpf__destroy(obj);
+	return NULL;
+}
+
+static inline struct rss_bpf *
+rss_bpf__open(void)
+{
+	return rss_bpf__open_opts(NULL);
+}
+
+static inline int
+rss_bpf__load(struct rss_bpf *obj)
+{
+	return bpf_object__load_skeleton(obj->skeleton);
+}
+
+static inline struct rss_bpf *
+rss_bpf__open_and_load(void)
+{
+	struct rss_bpf *obj;
+
+	obj = rss_bpf__open();
+	if (!obj)
+		return NULL;
+	if (rss_bpf__load(obj)) {
+		rss_bpf__destroy(obj);
+		return NULL;
+	}
+	return obj;
+}
+
+static inline int
+rss_bpf__attach(struct rss_bpf *obj)
+{
+	return bpf_object__attach_skeleton(obj->skeleton);
+}
+
+static inline void
+rss_bpf__detach(struct rss_bpf *obj)
+{
+	return bpf_object__detach_skeleton(obj->skeleton);
+}
+
+static inline int
+rss_bpf__create_skeleton(struct rss_bpf *obj)
+{
+	struct bpf_object_skeleton *s;
+
+	s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));
+	if (!s)
+		return -1;
+	obj->skeleton = s;
+
+	s->sz = sizeof(*s);
+	s->name = "rss_bpf";
+	s->obj = &obj->obj;
+
+	/* maps */
+	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)
+		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[2].name = "tap_rss_map_toeplitz_key";
+	s->maps[2].map = &obj->maps.tap_rss_map_toeplitz_key;
+
+	/* 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)
+		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 *)"\
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+\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x5a\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\xd8\x13\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x56\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\x60\x1a\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x09\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\
+\x10\0\0\0\0\0\0\0\x20\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\
+\x14\0\0\0\0\0\0\x3c\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\x6c\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x54\x14\0\0\0\0\0\
+\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x78\0\0\
+\0\x01\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x60\x14\0\0\0\0\0\0\x30\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x74\0\0\0\x09\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x90\x1a\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x09\0\0\0\
+\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\xb2\0\0\0\x02\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\x90\x14\0\0\0\0\0\0\xd0\x05\0\0\0\0\0\0\x01\0\0\0\x39\0\0\
+\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0";
+
+	return 0;
+err:
+	bpf_object__destroy_skeleton(s);
+	return -1;
+}
+
+#endif /* __RSS_BPF_SKEL_H__ */
diff --git a/ebpf/trace-events b/ebpf/trace-events
new file mode 100644
index 0000000000..411b1e2be3
--- /dev/null
+++ b/ebpf/trace-events
@@ -0,0 +1,4 @@
+# See docs/devel/tracing.txt for syntax documentation.
+
+# ebpf-rss.c
+ebpf_error(const char *s1, const char *s2) "error in %s: %s"
diff --git a/ebpf/trace.h b/ebpf/trace.h
new file mode 100644
index 0000000000..abefc46ab1
--- /dev/null
+++ b/ebpf/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-ebpf.h"