From: Stefan Chulski <stefanc@marvell.com>
Date: Mon, 5 Mar 2018 15:16:51 +0100
Subject: net: mvpp2: update the BM buffer free/destroy logic
Patch-mainline: v4.17-rc1
Git-commit: effbf5f58d64b1d1f93cb687d9797b42f291d5fd
References: bsc#1098633

The buffer free routine is updated to release only given a number of
buffers, and the destroy routine now checks the actual number of buffers
in the (BPPI and BPPE) HW counters before draining the pools. This
change helps getting jumbo frames support.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
[Antoine: cosmetic cleanup, commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvpp2.c |   45 +++++++++++++++++++++++++++++------
 1 file changed, 38 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -258,6 +258,7 @@
 #define MVPP2_BM_BPPI_READ_PTR_REG(pool)	(0x6100 + ((pool) * 4))
 #define MVPP2_BM_BPPI_PTRS_NUM_REG(pool)	(0x6140 + ((pool) * 4))
 #define     MVPP2_BM_BPPI_PTR_NUM_MASK		0x7ff
+#define MVPP22_BM_POOL_PTRS_NUM_MASK		0xfff8
 #define     MVPP2_BM_BPPI_PREFETCH_FULL_MASK	BIT(16)
 #define MVPP2_BM_POOL_CTRL_REG(pool)		(0x6200 + ((pool) * 4))
 #define     MVPP2_BM_START_MASK			BIT(0)
@@ -4251,11 +4252,17 @@ static void mvpp2_bm_bufs_get_addrs(stru
 
 /* Free all buffers from the pool */
 static void mvpp2_bm_bufs_free(struct device *dev, struct mvpp2 *priv,
-			       struct mvpp2_bm_pool *bm_pool)
+			       struct mvpp2_bm_pool *bm_pool, int buf_num)
 {
 	int i;
 
-	for (i = 0; i < bm_pool->buf_num; i++) {
+	if (buf_num > bm_pool->buf_num) {
+		WARN(1, "Pool does not have so many bufs pool(%d) bufs(%d)\n",
+		     bm_pool->id, buf_num);
+		buf_num = bm_pool->buf_num;
+	}
+
+	for (i = 0; i < buf_num; i++) {
 		dma_addr_t buf_dma_addr;
 		phys_addr_t buf_phys_addr;
 		void *data;
@@ -4277,16 +4284,39 @@ static void mvpp2_bm_bufs_free(struct de
 	bm_pool->buf_num -= i;
 }
 
+/* Check number of buffers in BM pool */
+int mvpp2_check_hw_buf_num(struct mvpp2 *priv, struct mvpp2_bm_pool *bm_pool)
+{
+	int buf_num = 0;
+
+	buf_num += mvpp2_read(priv, MVPP2_BM_POOL_PTRS_NUM_REG(bm_pool->id)) &
+				    MVPP22_BM_POOL_PTRS_NUM_MASK;
+	buf_num += mvpp2_read(priv, MVPP2_BM_BPPI_PTRS_NUM_REG(bm_pool->id)) &
+				    MVPP2_BM_BPPI_PTR_NUM_MASK;
+
+	/* HW has one buffer ready which is not reflected in the counters */
+	if (buf_num)
+		buf_num += 1;
+
+	return buf_num;
+}
+
 /* Cleanup pool */
 static int mvpp2_bm_pool_destroy(struct platform_device *pdev,
 				 struct mvpp2 *priv,
 				 struct mvpp2_bm_pool *bm_pool)
 {
+	int buf_num;
 	u32 val;
 
-	mvpp2_bm_bufs_free(&pdev->dev, priv, bm_pool);
-	if (bm_pool->buf_num) {
-		WARN(1, "cannot free all buffers in pool %d\n", bm_pool->id);
+	buf_num = mvpp2_check_hw_buf_num(priv, bm_pool);
+	mvpp2_bm_bufs_free(&pdev->dev, priv, bm_pool, buf_num);
+
+	/* Check buffer counters after free */
+	buf_num = mvpp2_check_hw_buf_num(priv, bm_pool);
+	if (buf_num) {
+		WARN(1, "cannot free all buffers in pool %d, buf_num left %d\n",
+		     bm_pool->id, bm_pool->buf_num);
 		return 0;
 	}
 
@@ -4534,7 +4564,7 @@ mvpp2_bm_pool_use(struct mvpp2_port *por
 			pkts_num = mvpp2_pools[pool].buf_num;
 		else
 			mvpp2_bm_bufs_free(port->dev->dev.parent,
-					   port->priv, new_pool);
+					   port->priv, new_pool, pkts_num);
 
 		new_pool->pkt_size = pkt_size;
 		new_pool->frag_size =
@@ -4598,7 +4628,8 @@ static int mvpp2_bm_update_mtu(struct ne
 	int num, pkts_num = port_pool->buf_num;
 
 	/* Update BM pool with new buffer size */
-	mvpp2_bm_bufs_free(dev->dev.parent, port->priv, port_pool);
+	mvpp2_bm_bufs_free(dev->dev.parent, port->priv, port_pool,
+			   port_pool->buf_num);
 	if (port_pool->buf_num) {
 		WARN(1, "cannot free all buffers in pool %d\n", port_pool->id);
 		return -EIO;