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net: Move NetClientState.info_str to dynamic allocations

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The info_str field of the NetClientState structure is static and has a size
of 256 bytes. This amount is often unclaimed, and the field itself is used
exclusively for HMP "info network".

The patch translates info_str to dynamic memory allocation.

This action is also allows us to painlessly discard usage of this field
for backend devices.

Signed-off-by: Alexey Kirillov <lekiravi@yandex-team.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Alexey Kirillov 2021-03-03 12:59:08 +03:00 • committed by Jason Wang
parent 3c3b656885
commit 59b5437eb7
11 changed files with 47 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

14
net/net.c
View file

@ -129,11 +129,12 @@ char *qemu_mac_strdup_printf(const uint8_t *macaddr)
void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
{
snprintf(nc->info_str, sizeof(nc->info_str),
"model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
nc->model,
macaddr[0], macaddr[1], macaddr[2],
macaddr[3], macaddr[4], macaddr[5]);
g_free(nc->info_str);
nc->info_str = g_strdup_printf(
"model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
nc->model,
macaddr[0], macaddr[1], macaddr[2],
macaddr[3], macaddr[4], macaddr[5]);
}
static int mac_table[256] = {0};
@ -352,6 +353,7 @@ static void qemu_free_net_client(NetClientState *nc)
}
g_free(nc->name);
g_free(nc->model);
g_free(nc->info_str);
qapi_free_NetdevInfo(nc->stored_config);
if (nc->destructor) {
nc->destructor(nc);
@ -1226,7 +1228,7 @@ void print_net_client(Monitor *mon, NetClientState *nc)
monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
nc->queue_index,
NetClientDriver_str(nc->info->type),
nc->info_str);
nc->info_str ? nc->info_str : "");
if (!QTAILQ_EMPTY(&nc->filters)) {
monitor_printf(mon, "filters:\n");
}