commit 59f27d69358efc919b50760f3d6dac0b637b5488
author Pavel Krotkiy <porsh@nebius.com> Wed Apr 03 12:52:56 2024 +0100
committer Michael Brown <mcb30@ipxe.org> Wed Apr 03 12:53:46 2024 +0100
tree a0281105d400ac6bbee62003ac6dc4b19b61965e
parent 165995b7e917a94533799fe43d14f5e3b1fef285

[netdevice] Add "linktype" setting

Add a new setting to provide access to the link layer protocol type
from scripts.  This can be useful in order to skip configuring
interfaces based on their link layer protocol or, conversely,
configure only selected interface types (Ethernet, IPoIB, etc.)

Example script:

    set idx:int32 0
    :loop
    isset ${net${idx}/mac} || exit 0
    iseq ${net${idx}/linktype} IPoIB && goto try_next ||
    autoboot net${idx} ||
    :try_next
    inc idx && goto loop

Signed-off-by: Pavel Krotkiy <porsh@nebius.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/settings.h

diff --git a/src/include/ipxe/settings.h b/src/include/ipxe/settings.h
index 424188d..0301da1 100644
--- a/src/include/ipxe/settings.h
+++ b/src/include/ipxe/settings.h
@@ -471,6 +471,8 @@
 extern const struct setting
 busid_setting __setting ( SETTING_NETDEV, busid );
 extern const struct setting
+linktype_setting __setting ( SETTING_NETDEV, linktype );
+extern const struct setting
 user_class_setting __setting ( SETTING_HOST_EXTRA, user-class );
 extern const struct setting
 vendor_class_setting __setting ( SETTING_HOST_EXTRA, vendor-class );

src/net/netdev_settings.c

diff --git a/src/net/netdev_settings.c b/src/net/netdev_settings.c
index fb98663..080b6d2 100644
--- a/src/net/netdev_settings.c
+++ b/src/net/netdev_settings.c
@@ -65,6 +65,11 @@
 	.description = "Bus ID",
 	.type = &setting_type_hex,
 };
+const struct setting linktype_setting __setting ( SETTING_NETDEV, linktype ) = {
+	.name = "linktype",
+	.description = "Link-layer type",
+	.type = &setting_type_string,
+};
 const struct setting chip_setting __setting ( SETTING_NETDEV, chip ) = {
 	.name = "chip",
 	.description = "Chip",
@@ -220,6 +225,22 @@
 }
 
 /**
+ * Fetch link layer type setting
+ *
+ * @v netdev		Network device
+ * @v data		Buffer to fill with setting data
+ * @v len		Length of buffer
+ * @ret len		Length of setting data, or negative error
+ */
+static int netdev_fetch_linktype ( struct net_device *netdev, void *data,
+				   size_t len ) {
+	const char *linktype = netdev->ll_protocol->name;
+
+	strncpy ( data, linktype, len );
+	return strlen ( linktype );
+}
+
+/**
  * Fetch chip setting
  *
  * @v netdev		Network device
@@ -281,6 +302,7 @@
 	{ &bustype_setting, NULL, netdev_fetch_bustype },
 	{ &busloc_setting, NULL, netdev_fetch_busloc },
 	{ &busid_setting, NULL, netdev_fetch_busid },
+	{ &linktype_setting, NULL, netdev_fetch_linktype },
 	{ &chip_setting, NULL, netdev_fetch_chip },
 	{ &ifname_setting, NULL, netdev_fetch_ifname },
 };