linux-kernel - [PATCH net] net: bcmasp: Restore programming of TX map vector register

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Message-Id: <20250718212242.3447751-1-florian.fainelli@broadcom.com>
Date: Fri, 18 Jul 2025 14:22:42 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: netdev@...r.kernel.org
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Justin Chen <justin.chen@...adcom.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] net: bcmasp: Restore programming of TX map vector register

On ASP versions v2.x we need to program the TX map vector register to
properly exercise end-to-end flow control, otherwise the TX engine can
either lock-up, or cause the hardware calculated checksum to be
wrong/corrupted when multiple back to back packets are being submitted
for transmission. This register defaults to 0, which means no flow
control being applied.

Fixes: e9f31435ee7d ("net: bcmasp: Add support for asp-v3.0")
Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 0d61b8580d72..f832562bd7a3 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -818,6 +818,9 @@ static void bcmasp_init_tx(struct bcmasp_intf *intf)
 	/* Tx SPB */
 	tx_spb_ctrl_wl(intf, ((intf->channel + 8) << TX_SPB_CTRL_XF_BID_SHIFT),
 		       TX_SPB_CTRL_XF_CTRL2);
+
+	if (intf->parent->tx_chan_offset)
+		tx_pause_ctrl_wl(intf, (1 << (intf->channel + 8)), TX_PAUSE_MAP_VECTOR);
 	tx_spb_top_wl(intf, 0x1e, TX_SPB_TOP_BLKOUT);
 
 	tx_spb_dma_wq(intf, intf->tx_spb_dma_addr, TX_SPB_DMA_READ);
-- 
2.34.1