Decouple limits on number of LUNs per port and LUs per CTL.

Those two values are not directly related, so make them independent.
This does not change any limits immediately, but makes number of LUNs
per port controllable via tunable/sysctl kern.cam.ctl.lun_map_size.
After this change increasing CTL_MAX_LUNS should be pretty cheap,
and even making it tunable should be easy.

MFC after:	2 weeks

1 files changed, 45 insertions, 25 deletions

diff --git a/sys/cam/ctl/ctl.c b/sys/cam/ctl/ctl.c
index 502aca27775a..3f5b752a0eef 100644
--- a/sys/cam/ctl/ctl.c
+++ b/sys/cam/ctl/ctl.c
@@ -407,6 +407,9 @@ SYSCTL_INT(_kern_cam_ctl, OID_AUTO, worker_threads, CTLFLAG_RDTUN,
 static int ctl_debug = CTL_DEBUG_NONE;
 SYSCTL_INT(_kern_cam_ctl, OID_AUTO, debug, CTLFLAG_RWTUN,
     &ctl_debug, 0, "Enabled debug flags");
+static int ctl_lun_map_size = 1024;
+SYSCTL_INT(_kern_cam_ctl, OID_AUTO, lun_map_size, CTLFLAG_RWTUN,
+    &ctl_lun_map_size, 0, "Size of per-port LUN map (max LUN + 1)");
 
 /*
  * Supported pages (0x00), Serial number (0x80), Device ID (0x83),
@@ -826,7 +829,7 @@ ctl_isc_announce_port(struct ctl_port *port)
 		return;
 	i = sizeof(msg->port) + strlen(port->port_name) + 1;
 	if (port->lun_map)
-		i += sizeof(uint32_t) * CTL_MAX_LUNS;
+		i += port->lun_map_size * sizeof(uint32_t);
 	if (port->port_devid)
 		i += port->port_devid->len;
 	if (port->target_devid)
@@ -846,7 +849,7 @@ ctl_isc_announce_port(struct ctl_port *port)
 	    "%d:%s", softc->ha_id, port->port_name) + 1;
 	i += msg->port.name_len;
 	if (port->lun_map) {
-		msg->port.lun_map_len = sizeof(uint32_t) * CTL_MAX_LUNS;
+		msg->port.lun_map_len = port->lun_map_size * sizeof(uint32_t);
 		memcpy(&msg->port.data[i], port->lun_map,
 		    msg->port.lun_map_len);
 		i += msg->port.lun_map_len;
@@ -1155,19 +1158,25 @@ ctl_isc_port_sync(struct ctl_softc *softc, union ctl_ha_msg *msg, int len)
 	    M_CTL);
 	i += msg->port.name_len;
 	if (msg->port.lun_map_len != 0) {
-		if (port->lun_map == NULL)
-			port->lun_map = malloc(sizeof(uint32_t) * CTL_MAX_LUNS,
+		if (port->lun_map == NULL ||
+		    port->lun_map_size * sizeof(uint32_t) <
+		    msg->port.lun_map_len) {
+			port->lun_map_size = 0;
+			free(port->lun_map, M_CTL);
+			port->lun_map = malloc(msg->port.lun_map_len,
 			    M_CTL, M_WAITOK);
-		memcpy(port->lun_map, &msg->port.data[i],
-		    sizeof(uint32_t) * CTL_MAX_LUNS);
+		}
+		memcpy(port->lun_map, &msg->port.data[i], msg->port.lun_map_len);
+		port->lun_map_size = msg->port.lun_map_len / sizeof(uint32_t);
 		i += msg->port.lun_map_len;
 	} else {
+		port->lun_map_size = 0;
 		free(port->lun_map, M_CTL);
 		port->lun_map = NULL;
 	}
 	if (msg->port.port_devid_len != 0) {
 		if (port->port_devid == NULL ||
-		    port->port_devid->len != msg->port.port_devid_len) {
+		    port->port_devid->len < msg->port.port_devid_len) {
 			free(port->port_devid, M_CTL);
 			port->port_devid = malloc(sizeof(struct ctl_devid) +
 			    msg->port.port_devid_len, M_CTL, M_WAITOK);
@@ -1182,7 +1191,7 @@ ctl_isc_port_sync(struct ctl_softc *softc, union ctl_ha_msg *msg, int len)
 	}
 	if (msg->port.target_devid_len != 0) {
 		if (port->target_devid == NULL ||
-		    port->target_devid->len != msg->port.target_devid_len) {
+		    port->target_devid->len < msg->port.target_devid_len) {
 			free(port->target_devid, M_CTL);
 			port->target_devid = malloc(sizeof(struct ctl_devid) +
 			    msg->port.target_devid_len, M_CTL, M_WAITOK);
@@ -1197,7 +1206,7 @@ ctl_isc_port_sync(struct ctl_softc *softc, union ctl_ha_msg *msg, int len)
 	}
 	if (msg->port.init_devid_len != 0) {
 		if (port->init_devid == NULL ||
-		    port->init_devid->len != msg->port.init_devid_len) {
+		    port->init_devid->len < msg->port.init_devid_len) {
 			free(port->init_devid, M_CTL);
 			port->init_devid = malloc(sizeof(struct ctl_devid) +
 			    msg->port.init_devid_len, M_CTL, M_WAITOK);
@@ -3295,7 +3304,7 @@ ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
 
 			if (port->lun_map != NULL) {
 				sbuf_printf(sb, "\t<lun_map>on</lun_map>\n");
-				for (j = 0; j < CTL_MAX_LUNS; j++) {
+				for (j = 0; j < port->lun_map_size; j++) {
 					plun = ctl_lun_map_from_port(port, j);
 					if (plun == UINT32_MAX)
 						continue;
@@ -3375,7 +3384,7 @@ ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
 			}
 		}
 		mtx_unlock(&softc->ctl_lock); // XXX: port_enable sleeps
-		if (lm->plun < CTL_MAX_LUNS) {
+		if (lm->plun != UINT32_MAX) {
 			if (lm->lun == UINT32_MAX)
 				retval = ctl_lun_map_unset(port, lm->plun);
 			else if (lm->lun < CTL_MAX_LUNS &&
@@ -3383,13 +3392,12 @@ ctl_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
 				retval = ctl_lun_map_set(port, lm->plun, lm->lun);
 			else
 				return (ENXIO);
-		} else if (lm->plun == UINT32_MAX) {
+		} else {
 			if (lm->lun == UINT32_MAX)
 				retval = ctl_lun_map_deinit(port);
 			else
 				retval = ctl_lun_map_init(port);
-		} else
-			return (ENXIO);
+		}
 		if (port->status & CTL_PORT_STATUS_ONLINE)
 			ctl_isc_announce_port(port);
 		break;
@@ -3442,15 +3450,20 @@ ctl_lun_map_init(struct ctl_port *port)
 {
 	struct ctl_softc *softc = port->ctl_softc;
 	struct ctl_lun *lun;
+	int size = ctl_lun_map_size;
 	uint32_t i;
 
-	if (port->lun_map == NULL)
-		port->lun_map = malloc(sizeof(uint32_t) * CTL_MAX_LUNS,
+	if (port->lun_map == NULL || port->lun_map_size < size) {
+		port->lun_map_size = 0;
+		free(port->lun_map, M_CTL);
+		port->lun_map = malloc(size * sizeof(uint32_t),
 		    M_CTL, M_NOWAIT);
+	}
 	if (port->lun_map == NULL)
 		return (ENOMEM);
-	for (i = 0; i < CTL_MAX_LUNS; i++)
+	for (i = 0; i < size; i++)
 		port->lun_map[i] = UINT32_MAX;
+	port->lun_map_size = size;
 	if (port->status & CTL_PORT_STATUS_ONLINE) {
 		if (port->lun_disable != NULL) {
 			STAILQ_FOREACH(lun, &softc->lun_list, links)
@@ -3469,6 +3482,7 @@ ctl_lun_map_deinit(struct ctl_port *port)
 
 	if (port->lun_map == NULL)
 		return (0);
+	port->lun_map_size = 0;
 	free(port->lun_map, M_CTL);
 	port->lun_map = NULL;
 	if (port->status & CTL_PORT_STATUS_ONLINE) {
@@ -3492,6 +3506,8 @@ ctl_lun_map_set(struct ctl_port *port, uint32_t plun, uint32_t glun)
 		if (status != 0)
 			return (status);
 	}
+	if (plun >= port->lun_map_size)
+		return (EINVAL);
 	old = port->lun_map[plun];
 	port->lun_map[plun] = glun;
 	if ((port->status & CTL_PORT_STATUS_ONLINE) && old == UINT32_MAX) {
@@ -3507,7 +3523,7 @@ ctl_lun_map_unset(struct ctl_port *port, uint32_t plun)
 {
 	uint32_t old;
 
-	if (port->lun_map == NULL)
+	if (port->lun_map == NULL || plun >= port->lun_map_size)
 		return (0);
 	old = port->lun_map[plun];
 	port->lun_map[plun] = UINT32_MAX;
@@ -3525,8 +3541,10 @@ ctl_lun_map_from_port(struct ctl_port *port, uint32_t lun_id)
 
 	if (port == NULL)
 		return (UINT32_MAX);
-	if (port->lun_map == NULL || lun_id == UINT32_MAX)
+	if (port->lun_map == NULL)
 		return (lun_id);
+	if (lun_id > port->lun_map_size)
+		return (UINT32_MAX);
 	return (port->lun_map[lun_id]);
 }
 
@@ -3539,7 +3557,7 @@ ctl_lun_map_to_port(struct ctl_port *port, uint32_t lun_id)
 		return (UINT32_MAX);
 	if (port->lun_map == NULL)
 		return (lun_id);
-	for (i = 0; i < CTL_MAX_LUNS; i++) {
+	for (i = 0; i < port->lun_map_size; i++) {
 		if (port->lun_map[i] == lun_id)
 			return (i);
 	}
@@ -9048,9 +9066,8 @@ ctl_report_luns(struct ctl_scsiio *ctsio)
 	struct scsi_report_luns_data *lun_data;
 	struct ctl_lun *lun, *request_lun;
 	struct ctl_port *port;
-	int num_luns, retval;
+	int num_filled, num_luns, num_port_luns, retval;
 	uint32_t alloc_len, lun_datalen;
-	int num_filled;
 	uint32_t initidx, targ_lun_id, lun_id;
 
 	retval = CTL_RETVAL_COMPLETE;
@@ -9060,9 +9077,10 @@ ctl_report_luns(struct ctl_scsiio *ctsio)
 
 	CTL_DEBUG_PRINT(("ctl_report_luns\n"));
 
-	mtx_lock(&softc->ctl_lock);
 	num_luns = 0;
-	for (targ_lun_id = 0; targ_lun_id < CTL_MAX_LUNS; targ_lun_id++) {
+	num_port_luns = port->lun_map ? port->lun_map_size : CTL_MAX_LUNS;
+	mtx_lock(&softc->ctl_lock);
+	for (targ_lun_id = 0; targ_lun_id < num_port_luns; targ_lun_id++) {
 		if (ctl_lun_map_from_port(port, targ_lun_id) != UINT32_MAX)
 			num_luns++;
 	}
@@ -9121,7 +9139,9 @@ ctl_report_luns(struct ctl_scsiio *ctsio)
 	initidx = ctl_get_initindex(&ctsio->io_hdr.nexus);
 
 	mtx_lock(&softc->ctl_lock);
-	for (targ_lun_id = 0, num_filled = 0; targ_lun_id < CTL_MAX_LUNS && num_filled < num_luns; targ_lun_id++) {
+	for (targ_lun_id = 0, num_filled = 0;
+	    targ_lun_id < num_port_luns && num_filled < num_luns;
+	    targ_lun_id++) {
 		lun_id = ctl_lun_map_from_port(port, targ_lun_id);
 		if (lun_id == UINT32_MAX)
 			continue;