mac: Add emulated DaynaPORT SCSI/Link-3 ethernet device

Currently only works on OpenBSD and requires read/write access to
the tap device (/dev/tap0 by default).  A helper script is run after
bringing up the device to do things as root like assign an IP (for
NAT) or configure bridging (for ethernet).

SCSI protocol information was gleaned from the DaynaPORT driver in
RASCSI and my real DaynaPORT device.

src/arch/macplus/Makefile.inc

@@ -51,6 +51,7 @@ PCE_MACPLUS_BAS := \
 	msg \
 	rtc \
 	scsi \
+	scsi_tap \
 	serial \
 	sony \
 	sound \
@@ -125,6 +126,7 @@ $(rel)/mem.o:		$(rel)/mem.c
 $(rel)/msg.o:		$(rel)/msg.c
 $(rel)/rtc.o:		$(rel)/rtc.c
 $(rel)/scsi.o:		$(rel)/scsi.c
+$(rel)/scsi_tap.o:	$(rel)/scsi_tap.c
 $(rel)/serial.o:	$(rel)/serial.c
 $(rel)/sony.o:		$(rel)/sony.c
 $(rel)/sound.o:		$(rel)/sound.c

src/arch/macplus/macplus.c

@@ -1070,8 +1070,8 @@ void mac_setup_scsi (macplus_t *sim, ini_sct_t *ini)
 	ini_sct_t     *sct, *sctdev;
 	mem_blk_t     *blk;
 	unsigned long addr, size;
-	unsigned      id, drive;
-	const char    *vendor, *product;
+	unsigned      id, drive, ethernet;
+	const char    *vendor, *product, *mac_addr, *tap_dev, *tap_cmd;
 
 	sct = ini_next_sct (ini, NULL, "scsi");
 
@@ -1108,17 +1108,35 @@ void mac_setup_scsi (macplus_t *sim, ini_sct_t *ini)
 	while (sctdev != NULL) {
 		ini_get_uint16 (sctdev, "id", &id, 0);
 		ini_get_uint16 (sctdev, "drive", &drive, 0);
-		ini_get_string (sctdev, "vendor", &vendor, "PCE");
-		ini_get_string (sctdev, "product", &product, "PCEDISK");
+		ini_get_uint16 (sctdev, "ethernet", &ethernet, 0);
 
-		pce_log_tag (MSG_INF,
-			"SCSI:", "id=%u drive=%u vendor=\"%s\" product=\"%s\"\n",
-			id, drive, vendor, product
-		);
+		if (drive) {
+			ini_get_string (sctdev, "vendor", &vendor, "PCE");
+			ini_get_string (sctdev, "product", &product, "PCEDISK");
+
+			pce_log_tag (MSG_INF,
+				"SCSI:",
+				"id=%u drive=%u vendor=\"%s\" product=\"%s\"\n",
+				id, drive, vendor, product
+			);
 
-		mac_scsi_set_drive (&sim->scsi, id, drive);
-		mac_scsi_set_drive_vendor (&sim->scsi, id, vendor);
-		mac_scsi_set_drive_product (&sim->scsi, id, product);
+			mac_scsi_set_drive (&sim->scsi, id, drive);
+			mac_scsi_set_drive_vendor (&sim->scsi, id, vendor);
+			mac_scsi_set_drive_product (&sim->scsi, id, product);
+		}
+		else if (ethernet) {
+			ini_get_string (sctdev, "tap", &tap_dev, "/dev/tap0");
+			ini_get_string (sctdev, "tap_cmd", &tap_cmd, "");
+			ini_get_string (sctdev, "mac_addr", &mac_addr, "00:80:19:c0:ff:ee");
+
+			pce_log_tag (MSG_INF,
+				"SCSI:",
+				"id=%u ethernet=%u tap=%s cmd=%s mac_addr=%s\n",
+				id, ethernet, tap_dev, tap_cmd, mac_addr
+			);
+
+			mac_scsi_set_ethernet (&sim->scsi, id, tap_dev, tap_cmd, mac_addr);
+		}
 
 		sctdev = ini_next_sct (sct, sctdev, "device");
 	}

src/arch/macplus/pce-macplus.cfg.in

@@ -280,6 +280,23 @@ scsi {
 		id    = 2
 		drive = 130
 	}
+
+	# DaynaPORT SCSI/Link device emulation on SCSI id 3.
+	# Requires read/write access on the "tap" device listed here.
+	#device {
+	#	id       = 3
+	#	ethernet = 1
+	#	tap      = "/dev/tap0"    # OpenBSD
+	#	tap      = "/dev/net/tun" # Linux
+	#	mac_addr = "00:80:19:c0:ff:ee"
+	#
+	#	# This command will be run after initializing the tap device
+	#	# and will have the tap device and MAC address passed as
+	#	# arguments.  It should probably assign an IP to this tap
+	#	# device if using NAT (required on WiFi), or setup bridging
+	#	# if using ethernet.
+	#	tap_cmd  = "sh /etc/pce/tap-setup.sh"
+	#}
 }