[PATCH 8/9] bcmgenet: fix DMA buffer management

[Jason Wessel]

This commit fixes a serious issue occurring when several network
commands are run on a raspberry pi 4 board: for instance a "dhcp"
command and then one or several "tftp" commands. In this case,
packet recv callbacks were called several times on the same packets,
and send function was failing most of the time.

note: if the boot procedure is made of a single network
command, the issue is not visible.

The issue is related to management of the packet ring buffers
(producer / consumer) and DMA.
Each time a packet is received, the ethernet device stores it
in the buffer and increments an index called RDMA_PROD_INDEX.
Each time the driver outputs a received packet, it increments
another index called RDMA_CONS_INDEX.

Between each pair of network commands, as part of the driver
'start' function, previous code tried to reset both RDMA_CONS_INDEX
and RDMA_PROD_INDEX to 0. But RDMA_PROD_INDEX cannot be written from
driver side, thus its value was actually not updated, and only
RDMA_CONS_INDEX was reset to 0. This was resulting in a major
synchronization issue between the driver and the device. Most
visible behavior was that the driver seemed to receive again the
packets from the previous commands (e.g. DHCP response packets
"received" again when performing the first TFTP command).

This fix consists in setting RDMA_CONS_INDEX to the same
value as RDMA_PROD_INDEX, when resetting the driver.

The same kind of fix was needed on the TX side, and a few variables
had to be reset accordingly (c_index, tx_index, rx_index).

The rx_index and tx_index have only 256 entries so the bottom 8 bits
must be masked off.

Originated-by: Etienne Dublé <etienne.duble at imag.fr>
Signed-off-by: Jason Wessel <jason.wessel at windriver.com>
---
 drivers/net/bcmgenet.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/bcmgenet.c b/drivers/net/bcmgenet.c
index 11b6148ab6..1b7e7ba2bf 100644
--- a/drivers/net/bcmgenet.c
+++ b/drivers/net/bcmgenet.c
@@ -378,8 +378,6 @@ static void rx_descs_init(struct bcmgenet_eth_priv *priv)
 	u32 len_stat, i;
 	void *desc_base = priv->rx_desc_base;
 
-	priv->c_index = 0;
-
 	len_stat = (RX_BUF_LENGTH << DMA_BUFLENGTH_SHIFT) | DMA_OWN;
 
 	for (i = 0; i < RX_DESCS; i++) {
@@ -403,8 +401,11 @@ static void rx_ring_init(struct bcmgenet_eth_priv *priv)
 	writel(RX_DESCS * DMA_DESC_SIZE / 4 - 1,
 	       priv->mac_reg + RDMA_RING_REG_BASE + DMA_END_ADDR);
 
-	writel(0x0, priv->mac_reg + RDMA_PROD_INDEX);
-	writel(0x0, priv->mac_reg + RDMA_CONS_INDEX);
+	/* cannot init RDMA_PROD_INDEX to 0, so align RDMA_CONS_INDEX on it instead */
+	priv->c_index = readl(priv->mac_reg + RDMA_PROD_INDEX);
+	writel(priv->c_index, priv->mac_reg + RDMA_CONS_INDEX);
+	priv->rx_index = priv->c_index;
+	priv->rx_index &= 0xFF;
 	writel((RX_DESCS << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH,
 	       priv->mac_reg + RDMA_RING_REG_BASE + DMA_RING_BUF_SIZE);
 	writel(DMA_FC_THRESH_VALUE, priv->mac_reg + RDMA_XON_XOFF_THRESH);
@@ -421,8 +422,10 @@ static void tx_ring_init(struct bcmgenet_eth_priv *priv)
 	writel(0x0, priv->mac_reg + TDMA_WRITE_PTR);
 	writel(TX_DESCS * DMA_DESC_SIZE / 4 - 1,
 	       priv->mac_reg + TDMA_RING_REG_BASE + DMA_END_ADDR);
-	writel(0x0, priv->mac_reg + TDMA_PROD_INDEX);
-	writel(0x0, priv->mac_reg + TDMA_CONS_INDEX);
+	/* cannot init TDMA_CONS_INDEX to 0, so align TDMA_PROD_INDEX on it instead */
+	priv->tx_index = readl(priv->mac_reg + TDMA_CONS_INDEX);
+	writel(priv->tx_index, priv->mac_reg + TDMA_PROD_INDEX);
+	priv->tx_index &= 0xFF;
 	writel(0x1, priv->mac_reg + TDMA_RING_REG_BASE + DMA_MBUF_DONE_THRESH);
 	writel(0x0, priv->mac_reg + TDMA_FLOW_PERIOD);
 	writel((TX_DESCS << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH,
@@ -469,8 +472,6 @@ static int bcmgenet_gmac_eth_start(struct udevice *dev)
 
 	priv->tx_desc_base = priv->mac_reg + GENET_TX_OFF;
 	priv->rx_desc_base = priv->mac_reg + GENET_RX_OFF;
-	priv->tx_index = 0x0;
-	priv->rx_index = 0x0;
 
 	bcmgenet_umac_reset(priv);
 
-- 
2.17.1