[PULL 11/23] pc-bios/s390-ccw: Move CCW net setup to virtio-ccw

[Eric Farman <farman@linux.ibm.com>]

From: Zhuoying Cai <zycai@linux.ibm.com>

Move CCW-specific virtio_setup() and find_net_dev() to virtio-ccw.c
to decouple the generic net boot logic from the CCW transport.
Also update the error message on failure to specify "ccw net device".

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
Reviewed-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260924222949.147720-2-zycai@linux.ibm.com
Signed-off-by: Eric Farman <farman@linux.ibm.com>
---
 pc-bios/s390-ccw/netmain.c    | 67 ++---------------------------------
 pc-bios/s390-ccw/virtio-ccw.c | 62 ++++++++++++++++++++++++++++++++
 pc-bios/s390-ccw/virtio-ccw.h |  1 +
 3 files changed, 66 insertions(+), 64 deletions(-)

diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index ccd1c30013..bcb62bf6ca 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -35,6 +35,7 @@
 #include "s390-ccw.h"
 #include "cio.h"
 #include "virtio.h"
+#include "virtio-ccw.h"
 #include "s390-time.h"
 
 #define DEFAULT_BOOT_RETRIES 10
@@ -489,68 +490,6 @@ static int net_try_direct_tftp_load(filename_ip_t *fn_ip)
     return rc;
 }
 
-static bool find_net_dev(Schib *schib, int dev_no)
-{
-    int i, r;
-
-    for (i = 0; i < 0x10000; i++) {
-        net_schid.sch_no = i;
-        r = stsch_err(net_schid, schib);
-        if (r == 3 || r == -EIO) {
-            break;
-        }
-        if (!schib->pmcw.dnv) {
-            continue;
-        }
-        enable_subchannel(net_schid);
-        if (!virtio_is_supported(virtio_get_device())) {
-            continue;
-        }
-        if (virtio_get_device_type() != VIRTIO_ID_NET) {
-            continue;
-        }
-        if (dev_no < 0 || schib->pmcw.dev == dev_no) {
-            return true;
-        }
-    }
-
-    return false;
-}
-
-static bool virtio_setup(void)
-{
-    Schib schib;
-    int ssid;
-    bool found = false;
-    uint16_t dev_no;
-
-    /*
-     * We unconditionally enable mss support. In every sane configuration,
-     * this will succeed; and even if it doesn't, stsch_err() can deal
-     * with the consequences.
-     */
-    enable_mss_facility();
-
-    if (have_iplb || store_iplb(iplb)) {
-        IPL_assert(iplb->pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected");
-        dev_no = iplb->ccw.devno;
-        debug_print_int("device no. ", dev_no);
-        net_schid.ssid = iplb->ccw.ssid & 0x3;
-        debug_print_int("ssid ", net_schid.ssid);
-        found = find_net_dev(&schib, dev_no);
-    } else {
-        for (ssid = 0; ssid < 0x3; ssid++) {
-            net_schid.ssid = ssid;
-            found = find_net_dev(&schib, -1);
-            if (found) {
-                break;
-            }
-        }
-    }
-
-    return found;
-}
-
 int netmain(void)
 {
     filename_ip_t fn_ip;
@@ -559,8 +498,8 @@ int netmain(void)
     sclp_setup();
     puts("Network boot starting...");
 
-    if (!virtio_setup()) {
-        puts("No virtio net device found.");
+    if (!virtio_ccw_net_setup()) {
+        puts("No valid virtio ccw net device found.");
         return -1;
     }
 
diff --git a/pc-bios/s390-ccw/virtio-ccw.c b/pc-bios/s390-ccw/virtio-ccw.c
index ea5dbc2857..3c2c44529c 100644
--- a/pc-bios/s390-ccw/virtio-ccw.c
+++ b/pc-bios/s390-ccw/virtio-ccw.c
@@ -220,3 +220,65 @@ int virtio_ccw_setup(VDev *vdev)
 
     return 0;
 }
+
+static bool find_ccw_net_dev(Schib *schib, int dev_no)
+{
+    int i, r;
+
+    for (i = 0; i < 0x10000; i++) {
+        net_schid.sch_no = i;
+        r = stsch_err(net_schid, schib);
+        if (r == 3 || r == -EIO) {
+            break;
+        }
+        if (!schib->pmcw.dnv) {
+            continue;
+        }
+        enable_subchannel(net_schid);
+        if (!virtio_is_supported(virtio_get_device())) {
+            continue;
+        }
+        if (virtio_get_device_type() != VIRTIO_ID_NET) {
+            continue;
+        }
+        if (dev_no < 0 || schib->pmcw.dev == dev_no) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool virtio_ccw_net_setup(void)
+{
+    Schib schib;
+    int ssid;
+    bool found = false;
+    uint16_t dev_no;
+
+    /*
+     * We unconditionally enable mss support. In every sane configuration,
+     * this will succeed; and even if it doesn't, stsch_err() can deal
+     * with the consequences.
+     */
+    enable_mss_facility();
+
+    if (have_iplb || store_iplb(iplb)) {
+        IPL_assert(iplb->pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected");
+        dev_no = iplb->ccw.devno;
+        debug_print_int("device no. ", dev_no);
+        net_schid.ssid = iplb->ccw.ssid & 0x3;
+        debug_print_int("ssid ", net_schid.ssid);
+        found = find_ccw_net_dev(&schib, dev_no);
+    } else {
+        for (ssid = 0; ssid < 0x3; ssid++) {
+            net_schid.ssid = ssid;
+            found = find_ccw_net_dev(&schib, -1);
+            if (found) {
+                break;
+            }
+        }
+    }
+
+    return found;
+}
diff --git a/pc-bios/s390-ccw/virtio-ccw.h b/pc-bios/s390-ccw/virtio-ccw.h
index 43d21906e5..7768c152d0 100644
--- a/pc-bios/s390-ccw/virtio-ccw.h
+++ b/pc-bios/s390-ccw/virtio-ccw.h
@@ -19,5 +19,6 @@ bool virtio_ccw_is_supported(VDev *vdev);
 long virtio_ccw_notify(SubChannelId schid, int vq_idx, long cookie);
 int virtio_ccw_setup(VDev *vdev);
 int virtio_ccw_reset(VDev *vdev);
+bool virtio_ccw_net_setup(void);
 
 #endif
-- 
2.55.0