[PATCH 6.19 045/311] net: enetc: add graceful stop to safely reinitialize the TX Ring

Greg Kroah-Hartman
2026-04-08T18:51:41Z

From: Wei Fang <wei.fang@nxp.com>

[ Upstream commit 2725d84efe2582c0a4b907e74a689d26b2dbd382 ]

For ENETC v4, the PIR and CIR will be reset if they are not equal when
reinitializing the TX BD ring. However, resetting the PIR and CIR alone
is insufficient. When a link-down event occurs while the TX BD ring is
transmitting frames, subsequent reinitialization of the TX BD ring may
cause it to malfunction. For example, the below steps can reproduce the
problem.

1. Unplug the cable when the TX BD ring is busy transmitting frames.
2. Disable the network interface (ifconfig eth0 down).
3. Re-enable the network interface (ifconfig eth0 up).
4. Plug in the cable, the TX BD ring may fail to transmit packets.

When the link-down event occurs, enetc4_pl_mac_link_down() only clears
PMa_COMMAND_CONFIG[TX_EN] to disable MAC transmit data path. It doesn't
set PORT[TXDIS] to 1 to flush the TX BD ring. Therefore, reinitializing
the TX BD ring at this point is unsafe. To safely reinitialize the TX BD
ring after a link-down event, we checked with the NETC IP team, a proper
Ethernet MAC graceful stop is necessary. Therefore, add the Ethernet MAC
graceful stop to the link-down event handler enetc4_pl_mac_link_down().

Fixes: 99100d0d9922 ("net: enetc: add preliminary support for i.MX95 ENETC PF")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260324062121.2745033-3-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/ethernet/freescale/enetc/enetc4_hw.h | 11 ++
.../net/ethernet/freescale/enetc/enetc4_pf.c | 111 +++++++++++++++---
2 files changed, 108 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_hw.h b/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
index 3ed0f7a027679..719c88ceb801a 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
@@ -134,6 +134,12 @@

/* Port operational register */
#define ENETC4_POR 0x4100
+#define POR_TXDIS BIT(0)
+#define POR_RXDIS BIT(1)
+
+/* Port status register */
+#define ENETC4_PSR 0x4104
+#define PSR_RX_BUSY BIT(1)

/* Port traffic class a transmit maximum SDU register */
#define ENETC4_PTCTMSDUR(a) ((a) * 0x20 + 0x4208)
@@ -173,6 +179,11 @@
/* Port internal MDIO base address, use to access PCS */
#define ENETC4_PM_IMDIO_BASE 0x5030

+/* Port MAC 0/1 Interrupt Event Register */
+#define ENETC4_PM_IEVENT(mac) (0x5040 + (mac) * 0x400)
+#define PM_IEVENT_TX_EMPTY BIT(5)
+#define PM_IEVENT_RX_EMPTY BIT(6)
+
/* Port MAC 0/1 Pause Quanta Register */
#define ENETC4_PM_PAUSE_QUANTA(mac) (0x5054 + (mac) * 0x400)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
index 5850540634b0c..6a334f2848448 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
@@ -444,20 +444,11 @@ static void enetc4_set_trx_frame_size(struct enetc_pf *pf)
enetc4_pf_reset_tc_msdu(&si->hw);
}

-static void enetc4_enable_trx(struct enetc_pf *pf)
-{
- struct enetc_hw *hw = &pf->si->hw;
-
- /* Enable port transmit/receive */
- enetc_port_wr(hw, ENETC4_POR, 0);
-}
-
static void enetc4_configure_port(struct enetc_pf *pf)
{
enetc4_configure_port_si(pf);
enetc4_set_trx_frame_size(pf);
enetc_set_default_rss_key(pf);
- enetc4_enable_trx(pf);
}

static int enetc4_init_ntmp_user(struct enetc_si *si)
@@ -801,15 +792,105 @@ static void enetc4_set_tx_pause(struct enetc_pf *pf, int num_rxbdr, bool tx_paus
enetc_port_wr(hw, ENETC4_PPAUOFFTR, pause_off_thresh);
}

-static void enetc4_enable_mac(struct enetc_pf *pf, bool en)
+static void enetc4_mac_wait_tx_empty(struct enetc_si *si, int mac)
+{
+ u32 val;
+
+ if (read_poll_timeout(enetc_port_rd, val,
+ val & PM_IEVENT_TX_EMPTY,
+ 100, 10000, false, &si->hw,
+ ENETC4_PM_IEVENT(mac)))
+ dev_warn(&si->pdev->dev,
+ "MAC %d TX is not empty\n", mac);
+}
+
+static void enetc4_mac_tx_graceful_stop(struct enetc_pf *pf)
+{
+ struct enetc_hw *hw = &pf->si->hw;
+ struct enetc_si *si = pf->si;
+ u32 val;
+
+ val = enetc_port_rd(hw, ENETC4_POR);
+ val |= POR_TXDIS;
+ enetc_port_wr(hw, ENETC4_POR, val);
+
+ enetc4_mac_wait_tx_empty(si, 0);
+ if (si->hw_features & ENETC_SI_F_QBU)
+ enetc4_mac_wait_tx_empty(si, 1);
+
+ val = enetc_port_mac_rd(si, ENETC4_PM_CMD_CFG(0));
+ val &= ~PM_CMD_CFG_TX_EN;
+ enetc_port_mac_wr(si, ENETC4_PM_CMD_CFG(0), val);
+}
+
+static void enetc4_mac_tx_enable(struct enetc_pf *pf)
{
+ struct enetc_hw *hw = &pf->si->hw;
struct enetc_si *si = pf->si;
u32 val;

val = enetc_port_mac_rd(si, ENETC4_PM_CMD_CFG(0));
- val &= ~(PM_CMD_CFG_TX_EN | PM_CMD_CFG_RX_EN);
- val |= en ? (PM_CMD_CFG_TX_EN | PM_CMD_CFG_RX_EN) : 0;
+ val |= PM_CMD_CFG_TX_EN;
+ enetc_port_mac_wr(si, ENETC4_PM_CMD_CFG(0), val);
+
+ val = enetc_port_rd(hw, ENETC4_POR);
+ val &= ~POR_TXDIS;
+ enetc_port_wr(hw, ENETC4_POR, val);
+}
+
+static void enetc4_mac_wait_rx_empty(struct enetc_si *si, int mac)
+{
+ u32 val;
+
+ if (read_poll_timeout(enetc_port_rd, val,
+ val & PM_IEVENT_RX_EMPTY,
+ 100, 10000, false, &si->hw,
+ ENETC4_PM_IEVENT(mac)))
+ dev_warn(&si->pdev->dev,
+ "MAC %d RX is not empty\n", mac);
+}
+
+static void enetc4_mac_rx_graceful_stop(struct enetc_pf *pf)
+{
+ struct enetc_hw *hw = &pf->si->hw;
+ struct enetc_si *si = pf->si;
+ u32 val;
+
+ if (si->hw_features & ENETC_SI_F_QBU) {
+ val = enetc_port_rd(hw, ENETC4_PM_CMD_CFG(1));
+ val &= ~PM_CMD_CFG_RX_EN;
+ enetc_port_wr(hw, ENETC4_PM_CMD_CFG(1), val);
+ enetc4_mac_wait_rx_empty(si, 1);
+ }
+
+ val = enetc_port_rd(hw, ENETC4_PM_CMD_CFG(0));
+ val &= ~PM_CMD_CFG_RX_EN;
+ enetc_port_wr(hw, ENETC4_PM_CMD_CFG(0), val);
+ enetc4_mac_wait_rx_empty(si, 0);
+
+ if (read_poll_timeout(enetc_port_rd, val,
+ !(val & PSR_RX_BUSY),
+ 100, 10000, false, hw,
+ ENETC4_PSR))
+ dev_warn(&si->pdev->dev, "Port RX busy\n");
+
+ val = enetc_port_rd(hw, ENETC4_POR);
+ val |= POR_RXDIS;
+ enetc_port_wr(hw, ENETC4_POR, val);
+}
+
+static void enetc4_mac_rx_enable(struct enetc_pf *pf)
+{
+ struct enetc_hw *hw = &pf->si->hw;
+ struct enetc_si *si = pf->si;
+ u32 val;
+
+ val = enetc_port_rd(hw, ENETC4_POR);
+ val &= ~POR_RXDIS;
+ enetc_port_wr(hw, ENETC4_POR, val);

+ val = enetc_port_mac_rd(si, ENETC4_PM_CMD_CFG(0));
+ val |= PM_CMD_CFG_RX_EN;
enetc_port_mac_wr(si, ENETC4_PM_CMD_CFG(0), val);
}

@@ -853,7 +934,8 @@ static void enetc4_pl_mac_link_up(struct phylink_config *config,
enetc4_set_hd_flow_control(pf, hd_fc);
enetc4_set_tx_pause(pf, priv->num_rx_rings, tx_pause);
enetc4_set_rx_pause(pf, rx_pause);
- enetc4_enable_mac(pf, true);
+ enetc4_mac_tx_enable(pf);
+ enetc4_mac_rx_enable(pf);
}

static void enetc4_pl_mac_link_down(struct phylink_config *config,
@@ -862,7 +944,8 @@ static void enetc4_pl_mac_link_down(struct phylink_config *config,
{
struct enetc_pf *pf = phylink_to_enetc_pf(config);

- enetc4_enable_mac(pf, false);
+ enetc4_mac_rx_graceful_stop(pf);
+ enetc4_mac_tx_graceful_stop(pf);
}

static const struct phylink_mac_ops enetc_pl_mac_ops = {
--
2.53.0