net/slirp: Tell the users when they are using deprecated options

We don't want to support the legacy -tftp, -bootp, -smb and
-net channel options forever. So let's start telling the users
that they are deprecated and what option should be used instead.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

net/slirp.c

@@ -784,6 +784,9 @@ int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret
         return 0;
     }
 
+    error_report("The '-net channel' option is deprecated. "
+                 "Please use '-netdev user,guestfwd=...' instead.");
+
     /* handle legacy -net channel,port:chr */
     optarg += strlen("channel,");
 

os-posix.c

@@ -40,6 +40,7 @@
 #include "net/slirp.h"
 #include "qemu-options.h"
 #include "qemu/rcu.h"
+#include "qemu/error-report.h"
 
 #ifdef CONFIG_LINUX
 #include <sys/prctl.h>
@@ -139,6 +140,8 @@ void os_parse_cmd_args(int index, const char *optarg)
     switch (index) {
 #ifdef CONFIG_SLIRP
     case QEMU_OPTION_smb:
+        error_report("The -smb option is deprecated. "
+                     "Please use '-netdev user,smb=...' instead.");
         if (net_slirp_smb(optarg) < 0)
             exit(1);
         break;

vl.c

@@ -3308,12 +3308,18 @@ int main(int argc, char **argv, char **envp)
 #endif
 #ifdef CONFIG_SLIRP
             case QEMU_OPTION_tftp:
+                error_report("The -tftp option is deprecated. "
+                             "Please use '-netdev user,tftp=...' instead.");
                 legacy_tftp_prefix = optarg;
                 break;
             case QEMU_OPTION_bootp:
+                error_report("The -bootp option is deprecated. "
+                             "Please use '-netdev user,bootfile=...' instead.");
                 legacy_bootp_filename = optarg;
                 break;
             case QEMU_OPTION_redir:
+                error_report("The -redir option is deprecated. "
+                             "Please use '-netdev user,hostfwd=...' instead.");
                 if (net_slirp_redir(optarg) < 0)
                     exit(1);
                 break;