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vhost-user: add vhost-user

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add virtio and vhost-user functions to connect with QEMU.

  $ ./passt --vhost-user

and

  # qemu-system-x86_64 ... -m 4G \
        -object memory-backend-memfd,id=memfd0,share=on,size=4G \
        -numa node,memdev=memfd0 \
        -chardev socket,id=chr0,path=/tmp/passt_1.socket \
        -netdev vhost-user,id=netdev0,chardev=chr0 \
        -device virtio-net,mac=9a:2b:2c:2d:2e:2f,netdev=netdev0 \
        ...

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
This commit is contained in:
Laurent Vivier 2024-11-13 09:04:06 +01:00 • committed by Stefano Brivio
parent 007af94bb9
commit 92fe7e967a
24 changed files with 1412 additions and 54 deletions

21
conf.c
View file

@ -45,6 +45,7 @@
#include "lineread.h"
#include "isolation.h"
#include "log.h"
#include "vhost_user.h"
#define NETNS_RUN_DIR "/run/netns"
@ -769,9 +770,14 @@ static void usage(const char *name, FILE *f, int status)
" default: same interface name as external one\n");
} else {
FPRINTF(f,
" -s, --socket PATH UNIX domain socket path\n"
" -s, --socket, --socket-path PATH UNIX domain socket path\n"
" default: probe free path starting from "
UNIX_SOCK_PATH "\n", 1);
FPRINTF(f,
" --vhost-user Enable vhost-user mode\n"
" UNIX domain socket is provided by -s option\n"
" --print-capabilities print back-end capabilities in JSON format,\n"
" only meaningful for vhost-user mode\n");
}
FPRINTF(f,
@ -1305,6 +1311,10 @@ void conf(struct ctx *c, int argc, char **argv)
{"map-guest-addr", required_argument, NULL, 22 },
{"host-lo-to-ns-lo", no_argument, NULL, 23 },
{"dns-host", required_argument, NULL, 24 },
{"vhost-user", no_argument, NULL, 25 },
/* vhost-user backend program convention */
{"print-capabilities", no_argument, NULL, 26 },
{"socket-path", required_argument, NULL, 's' },
{ 0 },
};
const char *logname = (c->mode == MODE_PASTA) ? "pasta" : "passt";
@ -1498,6 +1508,15 @@ void conf(struct ctx *c, int argc, char **argv)
break;
die("Invalid host nameserver address: %s", optarg);
case 25:
if (c->mode == MODE_PASTA) {
err("--vhost-user is for passt mode only");
usage(argv[0], stdout, EXIT_SUCCESS);
}
c->mode = MODE_VU;
break;
case 26:
vu_print_capabilities();
break;
case 'd':
c->debug = 1;