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qrap: Strip network devices from command line, set them up according to machine

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The previous approach wasn't really robust: adding a -netdev option
without libvirt knowing could result in clashes with other devices.

Drop network devices from command line, check the available busses
and addresses from all -device options according to the -machine
parameter, and add a virtio-net device using an available address
or bus. Then, add a corresponding -netdev socket option.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-05-12 08:35:36 +02:00
parent 7503332a1e
commit 5307faa059
1 changed files with 95 additions and 28 deletions
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123
qrap.c
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@ -27,6 +27,9 @@
#include "passt.h"
#define STRINGIFY(x) #x
#define STR(x) STRINGIFY(x)
static char *qemu_names[] = {
"kvm",
"qemu-kvm",
@ -37,6 +40,36 @@ static char *qemu_names[] = {
NULL,
};
static const struct drop_arg {
char *name;
char *val;
} drop_args[] = {
{ "-netdev", NULL },
{ "-net", NULL },
{ "-device", "virtio-net-pci," },
{ "-device", "virtio-net-ccw," },
{ "-device", "e1000," },
{ "-device", "rtl8139," },
{ 0 },
};
static const struct pci_dev {
char *mach;
char *name;
char *template;
char *template_post;
int first;
int last;
} pci_devs[] = {
{ "pc-q35", "virtio-net-pci",
"bus=pci.", ",addr=0x0", 3, 16 },
{ "pc-", "virtio-net-pci",
"bus=pci.0,addr=0x", "", 2, /* 1: ISA bridge */ 16 },
{ "s390-ccw", "virtio-net-ccw",
"devno=fe.0.", "", 1, 16 },
{ 0 },
};
#define DEFAULT_FD 5
/**
@ -63,13 +96,13 @@ void usage(const char *name)
*/
int main(int argc, char **argv)
{
char *qemu_argv[ARG_MAX], net_id[ARG_MAX] = { 0 }, *net_id_end;
int i, s, qemu_argc = 0, in_netdev = 0, has_socket = 0;
char *qemu_argv[ARG_MAX], dev_str[ARG_MAX];
int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0;
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = UNIX_SOCK_PATH,
};
char fd_str[ARG_MAX];
const struct pci_dev *dev = NULL;
long fd;
if (argc >= 3) {
@ -90,39 +123,73 @@ int main(int argc, char **argv)
}
fd = DEFAULT_FD;
for (qemu_argc = 1, i = 1; i < argc; i++) {
char *p;
if (in_netdev) {
in_netdev = 0;
if (strstr(argv[i], ",socket") ||
strstr(argv[i], "socket,"))
has_socket = 1;
} else if (!strcmp(argv[i], "-net") ||
!strcmp(argv[i], "-netdev")) {
in_netdev = 1;
for (i = 1; i < argc - 1; i++) {
if (strcmp(argv[i], "-machine"))
continue;
for (dev = pci_devs; dev->mach; dev++) {
if (strstr(argv[i + 1], dev->mach) == argv[i + 1])
break;
}
}
if (!dev || !dev->mach)
dev = pci_devs;
for (qemu_argc = 1, i = 1; i < argc; i++) {
const struct drop_arg *a;
for (a = drop_args; a->name; a++) {
if (!strcmp(argv[i], a->name)) {
if (!a->val)
break;
if (i + 1 < argc &&
strstr(argv[i + 1], a->val) == argv[i + 1])
break;
}
}
if (a->name) {
i++;
continue;
}
if (!*net_id && (p = strstr(argv[i], ",netdev=")))
strncpy(net_id, p + strlen(",netdev="), ARG_MAX);
if (!strcmp(argv[i], "-device") && i + 1 < argc) {
char *p;
long n;
has_dev = 1;
if ((p = strstr(argv[i + 1], dev->template))) {
n = strtol(p + strlen(dev->template), NULL, 16);
if (!errno)
addr_map |= (1 << n);
}
}
qemu_argv[qemu_argc++] = argv[i];
}
if (!has_socket) {
if (*net_id) {
net_id_end = strpbrk(net_id, ", ");
if (net_id_end)
*net_id_end = 0;
}
qemu_argv[qemu_argc++] = "-netdev";
snprintf(fd_str, ARG_MAX, "socket,fd=%u,id=%s", DEFAULT_FD,
*net_id ? net_id : "hostnet0");
qemu_argv[qemu_argc++] = fd_str;
qemu_argv[qemu_argc] = NULL;
for (i = dev->first; i < dev->last; i++) {
if (!(addr_map & (1 << i)))
break;
}
if (i == dev->last) {
fprintf(stderr, "Couldn't find free address for device\n");
usage(argv[0]);
}
if (has_dev) {
qemu_argv[qemu_argc++] = "-device";
snprintf(dev_str, ARG_MAX, "%s,%s%x%s,netdev=hostnet0",
dev->name, dev->template, i, dev->template_post);
qemu_argv[qemu_argc++] = dev_str;
}
qemu_argv[qemu_argc++] = "-netdev";
qemu_argv[qemu_argc++] = "socket,fd=" STR(DEFAULT_FD) ",id=hostnet0";
qemu_argv[qemu_argc] = NULL;
valid_args:
s = socket(AF_UNIX, SOCK_STREAM, 0);