synclink_gt: add rx DMA buffer fill level control

Add run time control for receive DMA buffer fill level to allow
application to control receive latency when using stream oriented serial
protocols that pass receive data to application only after a DMA buffer
fills.  This was previously a compile time option, but run time control is
needed when application changes data rate (and latency requirements) or
uses different data rates on different ports.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/synclink_gt.c

@@ -303,7 +303,7 @@ struct slgt_info {
 	u32 idle_mode;
 	u32 max_frame_size;       /* as set by device config */
 
-	unsigned int raw_rx_size;
+	unsigned int rbuf_fill_level;
 	unsigned int if_mode;
 
 	/* device status */
@@ -2676,8 +2676,29 @@ static int tx_abort(struct slgt_info *info)
 static int rx_enable(struct slgt_info *info, int enable)
 {
  	unsigned long flags;
-	DBGINFO(("%s rx_enable(%d)\n", info->device_name, enable));
+	unsigned int rbuf_fill_level;
+	DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
 	spin_lock_irqsave(&info->lock,flags);
+	/*
+	 * enable[31..16] = receive DMA buffer fill level
+	 * 0 = noop (leave fill level unchanged)
+	 * fill level must be multiple of 4 and <= buffer size
+	 */
+	rbuf_fill_level = ((unsigned int)enable) >> 16;
+	if (rbuf_fill_level) {
+		if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4))
+			return -EINVAL;
+		info->rbuf_fill_level = rbuf_fill_level;
+		rx_stop(info); /* restart receiver to use new fill level */
+	}
+
+	/*
+	 * enable[1..0] = receiver enable command
+	 * 0 = disable
+	 * 1 = enable
+	 * 2 = enable or force hunt mode if already enabled
+	 */
+	enable &= 3;
 	if (enable) {
 		if (!info->rx_enabled)
 			rx_start(info);
@@ -3444,7 +3465,7 @@ static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev
 		info->magic = MGSL_MAGIC;
 		INIT_WORK(&info->task, bh_handler);
 		info->max_frame_size = 4096;
-		info->raw_rx_size = DMABUFSIZE;
+		info->rbuf_fill_level = DMABUFSIZE;
 		info->port.close_delay = 5*HZ/10;
 		info->port.closing_wait = 30*HZ;
 		init_waitqueue_head(&info->status_event_wait_q);
@@ -4447,16 +4468,7 @@ static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last
 	while(!done) {
 		/* reset current buffer for reuse */
 		info->rbufs[i].status = 0;
-		switch(info->params.mode) {
-		case MGSL_MODE_RAW:
-		case MGSL_MODE_MONOSYNC:
-		case MGSL_MODE_BISYNC:
-			set_desc_count(info->rbufs[i], info->raw_rx_size);
-			break;
-		default:
-			set_desc_count(info->rbufs[i], DMABUFSIZE);
-		}
-
+		set_desc_count(info->rbufs[i], info->rbuf_fill_level);
 		if (i == last)
 			done = 1;
 		if (++i == info->rbuf_count)
@@ -4563,7 +4575,7 @@ check_again:
 
 	DBGBH(("%s rx frame status=%04X size=%d\n",
 		info->device_name, status, framesize));
-	DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
+	DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
 
 	if (framesize) {
 		if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
@@ -4583,7 +4595,7 @@ check_again:
 			info->icount.rxok++;
 
 			while(copy_count) {
-				int partial_count = min(copy_count, DMABUFSIZE);
+				int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
 				memcpy(p, info->rbufs[i].buf, partial_count);
 				p += partial_count;
 				copy_count -= partial_count;