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[RFC PATCH 3/5] ebpf_rss_helper: Added helper for eBPF RSS.
From: |
Andrew Melnychenko |
Subject: |
[RFC PATCH 3/5] ebpf_rss_helper: Added helper for eBPF RSS. |
Date: |
Wed, 9 Jun 2021 13:04:55 +0300 |
Helper program. Loads eBPF RSS program and maps and passes them through unix
socket.
Libvirt may launch this helper and pass eBPF fds to qemu virtio-net.
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
---
ebpf/qemu-ebpf-rss-helper.c | 130 ++++++++++++++++++++++++++++++++++++
meson.build | 8 +++
2 files changed, 138 insertions(+)
create mode 100644 ebpf/qemu-ebpf-rss-helper.c
diff --git a/ebpf/qemu-ebpf-rss-helper.c b/ebpf/qemu-ebpf-rss-helper.c
new file mode 100644
index 0000000000..f0379dddf2
--- /dev/null
+++ b/ebpf/qemu-ebpf-rss-helper.c
@@ -0,0 +1,130 @@
+/*
+ * eBPF RSS Helper
+ *
+ * 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. See
+ * the COPYING file in the top-level directory.
+ *
+ * Description: This is helper program for libvirtd.
+ * It loads eBPF RSS program and passes fds through unix socket.
+ * Built by meson, target - 'qemu-ebpf-rss-helper'.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <getopt.h>
+#include <memory.h>
+#include <errno.h>
+#include <sys/socket.h>
+
+#include "ebpf_rss.h"
+
+static int send_fds(int socket, int *fds, int n)
+{
+ struct msghdr msg = {};
+ struct cmsghdr *cmsg = NULL;
+ char buf[CMSG_SPACE(n * sizeof(int))];
+ char dummy_buffer = 0;
+ struct iovec io = { .iov_base = &dummy_buffer,
+ .iov_len = sizeof(dummy_buffer) };
+
+ memset(buf, 0, sizeof(buf));
+
+ msg.msg_iov = &io;
+ msg.msg_iovlen = 1;
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(n * sizeof(int));
+
+ memcpy(CMSG_DATA(cmsg), fds, n * sizeof(int));
+
+ return sendmsg(socket, &msg, 0);
+}
+
+static void print_help_and_exit(const char *prog, int exitcode)
+{
+ fprintf(stderr, "%s - load eBPF RSS program for qemu and pass eBPF fds"
+ " through unix socket.\n", prog);
+ fprintf(stderr, "\t--fd <num>, -f <num> - unix socket file descriptor"
+ " used to pass eBPF fds.\n");
+ fprintf(stderr, "\t--help, -h - this help.\n");
+ exit(exitcode);
+}
+
+int main(int argc, char **argv)
+{
+ char *fd_string = NULL;
+ int unix_fd = 0;
+ struct EBPFRSSContext ctx = {};
+ int fds[EBPF_RSS_MAX_FDS] = {};
+ int ret = -1;
+
+ for (;;) {
+ int c;
+ static struct option long_options[] = {
+ {"help", no_argument, 0, 'h'},
+ {"fd", required_argument, 0, 'f'},
+ {0, 0, 0, 0}
+ };
+ c = getopt_long(argc, argv, "hf:",
+ long_options, NULL);
+
+ if (c == -1) {
+ break;
+ }
+
+ switch (c) {
+ case 'f':
+ fd_string = optarg;
+ break;
+ case 'h':
+ default:
+ print_help_and_exit(argv[0],
+ c == 'h' ? EXIT_SUCCESS : EXIT_FAILURE);
+ }
+ }
+
+ if (!fd_string) {
+ fprintf(stderr, "Unix file descriptor not present.\n");
+ print_help_and_exit(argv[0], EXIT_FAILURE);
+ }
+
+ fprintf(stderr, "FD %s\n", fd_string);
+
+ unix_fd = atoi(fd_string);
+
+ if (!unix_fd) {
+ fprintf(stderr, "Unix file descriptor is invalid.\n");
+ return EXIT_FAILURE;
+ }
+
+ ebpf_rss_init(&ctx);
+ if (!ebpf_rss_load(&ctx)) {
+ fprintf(stderr, "Can't load ebpf.\n");
+ return EXIT_FAILURE;
+ }
+ fds[0] = ctx.program_fd;
+ fds[1] = ctx.map_configuration;
+ fds[2] = ctx.map_toeplitz_key;
+ fds[3] = ctx.map_indirections_table;
+
+ ret = send_fds(unix_fd, fds, EBPF_RSS_MAX_FDS);
+ if (ret < 0) {
+ fprintf(stderr, "Issue while sending fds: %s.\n", strerror(errno));
+ }
+
+ ebpf_rss_unload(&ctx);
+
+ return ret < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
diff --git a/meson.build b/meson.build
index 626cf932c1..ce26bddead 100644
--- a/meson.build
+++ b/meson.build
@@ -2413,6 +2413,14 @@ if have_tools
dependencies: [authz, crypto, io, qom, qemuutil,
libcap_ng, mpathpersist],
install: true)
+
+ if libbpf.found()
+ executable('qemu-ebpf-rss-helper', files(
+ 'ebpf/qemu-ebpf-rss-helper.c', 'ebpf/ebpf_rss.c'),
+ dependencies: [qemuutil, libbpf, glib],
+ install: true,
+ install_dir: get_option('libexecdir'))
+ endif
endif
if 'CONFIG_IVSHMEM' in config_host
--
2.31.1
- [RFC PATCH 0/5] ebpf: Added ebpf helper for libvirtd., Andrew Melnychenko, 2021/06/09
- [RFC PATCH 1/5] ebpf: Added eBPF initialization by fds., Andrew Melnychenko, 2021/06/09
- [RFC PATCH 2/5] virtio-net: Added property to load eBPF RSS with fds., Andrew Melnychenko, 2021/06/09
- [RFC PATCH 3/5] ebpf_rss_helper: Added helper for eBPF RSS.,
Andrew Melnychenko <=
- [RFC PATCH 4/5] qmp: Added qemu-ebpf-rss-path command., Andrew Melnychenko, 2021/06/09
- [RFC PATCH 5/5] meson: libbpf dependency now exclusively for Linux., Andrew Melnychenko, 2021/06/09
- Re: [RFC PATCH 0/5] ebpf: Added ebpf helper for libvirtd., Jason Wang, 2021/06/10