[PATCH v2 1/4] net: ethernet: ti: am65-cpsw: Fix set channel operation

From: Roger Quadros
Date: Mon Nov 21 2022 - 09:23:24 EST

The set channel operation "ethtool -L tx <n>" broke with
the recent suspend/resume changes.

Revert back to original driver behaviour of not freeing
the TX/RX IRQs at am65_cpsw_nuss_common_stop(). We will
now free them only on .suspend() as we need to release
the DMA channels (as DMA looses context) and re-acquiring
them on .resume() may not necessarily give us the same
IRQs.

Introduce am65_cpsw_nuss_remove_rx_chns() which is similar
to am65_cpsw_nuss_remove_tx_chns() and invoke them both in
.suspend().

At .resume() call am65_cpsw_nuss_init_rx/tx_chns() to
acquire the DMA channels.

To as IRQs need to be requested after knowing the IRQ
numbers, move am65_cpsw_nuss_ndev_add_tx_napi() call to
am65_cpsw_nuss_init_tx_chns().

Also fixes the below warning during suspend/resume on multi
CPU system.

[ 67.347684] ------------[ cut here ]------------
[ 67.347700] Unbalanced enable for IRQ 119
[ 67.347726] WARNING: CPU: 0 PID: 1080 at kernel/irq/manage.c:781 __enable_irq+0x4c/0x80
[ 67.347754] Modules linked in: wlcore_sdio wl18xx wlcore mac80211 libarc4 cfg80211 rfkill crct10dif_ce sch_fq_codel ipv6
[ 67.347803] CPU: 0 PID: 1080 Comm: rtcwake Not tainted 6.1.0-rc4-00023-gc826e5480732-dirty #203
[ 67.347812] Hardware name: Texas Instruments AM625 (DT)
[ 67.347818] pstate: 400000c5 (nZcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 67.347829] pc : __enable_irq+0x4c/0x80
[ 67.347838] lr : __enable_irq+0x4c/0x80
[ 67.347846] sp : ffff80000999ba00
[ 67.347850] x29: ffff80000999ba00 x28: ffff0000011c1c80 x27: 0000000000000000
[ 67.347863] x26: 00000000000001f4 x25: ffff000001058358 x24: ffff000001059080
[ 67.347876] x23: ffff000001058080 x22: ffff000001060000 x21: 0000000000000077
[ 67.347888] x20: ffff0000011c1c80 x19: ffff000001429600 x18: 0000000000000001
[ 67.347900] x17: 0000000000000080 x16: fffffc000176e008 x15: ffff0000011c21b0
[ 67.347913] x14: 0000000000000000 x13: 3931312051524920 x12: 726f6620656c6261
[ 67.347925] x11: 656820747563205b x10: 000000000000000a x9 : ffff80000999ba00
[ 67.347938] x8 : ffff800009121068 x7 : ffff80000999b810 x6 : 00000000fffff17f
[ 67.347950] x5 : ffff00007fb99b18 x4 : 0000000000000000 x3 : 0000000000000027
[ 67.347962] x2 : ffff00007fb99b20 x1 : 50dd48f7f19deb00 x0 : 0000000000000000
[ 67.347975] Call trace:
[ 67.347980] __enable_irq+0x4c/0x80
[ 67.347989] enable_irq+0x4c/0xa0
[ 67.347999] am65_cpsw_nuss_ndo_slave_open+0x4b0/0x568
[ 67.348015] am65_cpsw_nuss_resume+0x68/0x160
[ 67.348025] dpm_run_callback.isra.0+0x28/0x88
[ 67.348040] device_resume+0x78/0x160
[ 67.348050] dpm_resume+0xc0/0x1f8
[ 67.348057] dpm_resume_end+0x18/0x30
[ 67.348063] suspend_devices_and_enter+0x1cc/0x4e0
[ 67.348075] pm_suspend+0x1f8/0x268
[ 67.348084] state_store+0x8c/0x118
[ 67.348092] kobj_attr_store+0x18/0x30
[ 67.348104] sysfs_kf_write+0x44/0x58
[ 67.348117] kernfs_fop_write_iter+0x118/0x1a8
[ 67.348127] vfs_write+0x31c/0x418
[ 67.348140] ksys_write+0x6c/0xf8
[ 67.348150] __arm64_sys_write+0x1c/0x28
[ 67.348160] invoke_syscall+0x44/0x108
[ 67.348172] el0_svc_common.constprop.0+0x44/0xf0
[ 67.348182] do_el0_svc+0x2c/0xc8
[ 67.348191] el0_svc+0x2c/0x88
[ 67.348201] el0t_64_sync_handler+0xb8/0xc0
[ 67.348209] el0t_64_sync+0x18c/0x190
[ 67.348218] ---[ end trace 0000000000000000 ]---

Fixes: fd23df72f2be ("net: ethernet: ti: am65-cpsw: Add suspend/resume support")
Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 161 +++++++++++++----------
1 file changed, 90 insertions(+), 71 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index f2e377524088..505c9edf98ff 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -133,10 +133,7 @@
NETIF_MSG_IFUP | NETIF_MSG_PROBE | NETIF_MSG_IFDOWN | \
NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)

-static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common);
-static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common);
-static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common);
-static void am65_cpsw_nuss_free_rx_chns(struct am65_cpsw_common *common);
+static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common);

static void am65_cpsw_port_set_sl_mac(struct am65_cpsw_port *slave,
const u8 *dev_addr)
@@ -379,20 +376,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
if (common->usage_count)
return 0;

- /* init tx/rx channels */
- ret = am65_cpsw_nuss_init_tx_chns(common);
- if (ret) {
- dev_err(common->dev, "init_tx_chns failed\n");
- return ret;
- }
-
- ret = am65_cpsw_nuss_init_rx_chns(common);
- if (ret) {
- dev_err(common->dev, "init_rx_chns failed\n");
- am65_cpsw_nuss_free_tx_chns(common);
- return ret;
- }
-
/* Control register */
writel(AM65_CPSW_CTL_P0_ENABLE | AM65_CPSW_CTL_P0_TX_CRC_REMOVE |
AM65_CPSW_CTL_VLAN_AWARE | AM65_CPSW_CTL_P0_RX_PAD,
@@ -453,8 +436,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
GFP_KERNEL);
if (!skb) {
dev_err(common->dev, "cannot allocate skb\n");
- ret = -ENOMEM;
- goto err;
+ return -ENOMEM;
}

ret = am65_cpsw_nuss_rx_push(common, skb);
@@ -463,7 +445,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
"cannot submit skb to channel rx, error %d\n",
ret);
kfree_skb(skb);
- goto err;
+ return ret;
}
kmemleak_not_leak(skb);
}
@@ -472,7 +454,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
for (i = 0; i < common->tx_ch_num; i++) {
ret = k3_udma_glue_enable_tx_chn(common->tx_chns[i].tx_chn);
if (ret)
- goto err;
+ return ret;
napi_enable(&common->tx_chns[i].napi_tx);
}

@@ -484,12 +466,6 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)

dev_dbg(common->dev, "cpsw_nuss started\n");
return 0;
-
-err:
- am65_cpsw_nuss_free_tx_chns(common);
- am65_cpsw_nuss_free_rx_chns(common);
-
- return ret;
}

static void am65_cpsw_nuss_tx_cleanup(void *data, dma_addr_t desc_dma);
@@ -543,9 +519,6 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
writel(0, common->cpsw_base + AM65_CPSW_REG_CTL);
writel(0, common->cpsw_base + AM65_CPSW_REG_STAT_PORT_EN);

- am65_cpsw_nuss_free_tx_chns(common);
- am65_cpsw_nuss_free_rx_chns(common);
-
dev_dbg(common->dev, "cpsw_nuss stopped\n");
return 0;
}
@@ -597,8 +570,8 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
cpsw_sl_ctl_set(port->slave.mac_sl, CPSW_SL_CTL_CMD_IDLE);

tmo = cpsw_sl_wait_for_idle(port->slave.mac_sl, 100);
- dev_info(common->dev, "down msc_sl %08x tmo %d\n",
- cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_MACSTATUS), tmo);
+ dev_dbg(common->dev, "down msc_sl %08x tmo %d\n",
+ cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_MACSTATUS), tmo);

cpsw_sl_ctl_reset(port->slave.mac_sl);

@@ -1548,9 +1521,9 @@ static void am65_cpsw_nuss_slave_disable_unused(struct am65_cpsw_port *port)
cpsw_sl_ctl_reset(port->slave.mac_sl);
}

-static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common)
+static void am65_cpsw_nuss_free_tx_chns(void *data)
{
- struct device *dev = common->dev;
+ struct am65_cpsw_common *common = data;
int i;

for (i = 0; i < common->tx_ch_num; i++) {
@@ -1562,11 +1535,7 @@ static void am65_cpsw_nuss_free_tx_chns(struct am65_cpsw_common *common)
if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
k3_udma_glue_release_tx_chn(tx_chn->tx_chn);

- /* Don't clear tx_chn memory as we need to preserve
- * data between suspend/resume
- */
- if (!(tx_chn->irq < 0))
- devm_free_irq(dev, tx_chn->irq, tx_chn);
+ memset(tx_chn, 0, sizeof(*tx_chn));
}
}

@@ -1575,10 +1544,12 @@ void am65_cpsw_nuss_remove_tx_chns(struct am65_cpsw_common *common)
struct device *dev = common->dev;
int i;

+ devm_remove_action(dev, am65_cpsw_nuss_free_tx_chns, common);
+
for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];

- if (!(tx_chn->irq < 0))
+ if (tx_chn->irq)
devm_free_irq(dev, tx_chn->irq, tx_chn);

netif_napi_del(&tx_chn->napi_tx);
@@ -1648,7 +1619,7 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
}

tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
- if (tx_chn->irq < 0) {
+ if (tx_chn->irq <= 0) {
dev_err(dev, "Failed to get tx dma irq %d\n",
tx_chn->irq);
goto err;
@@ -1657,41 +1628,59 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
snprintf(tx_chn->tx_chn_name,
sizeof(tx_chn->tx_chn_name), "%s-tx%d",
dev_name(dev), tx_chn->id);
-
- ret = devm_request_irq(dev, tx_chn->irq,
- am65_cpsw_nuss_tx_irq,
- IRQF_TRIGGER_HIGH,
- tx_chn->tx_chn_name, tx_chn);
- if (ret) {
- dev_err(dev, "failure requesting tx%u irq %u, %d\n",
- tx_chn->id, tx_chn->irq, ret);
- tx_chn->irq = -EINVAL;
- goto err;
- }
}

- return 0;
+ ret = am65_cpsw_nuss_ndev_add_tx_napi(common);
+ if (ret) {
+ dev_err(dev, "Failed to add tx NAPI %d\n", ret);
+ goto err;
+ }

err:
- am65_cpsw_nuss_free_tx_chns(common);
+ i = devm_add_action(dev, am65_cpsw_nuss_free_tx_chns, common);
+ if (i) {
+ dev_err(dev, "Failed to add free_tx_chns action %d\n", i);
+ return i;
+ }

return ret;
}

-static void am65_cpsw_nuss_free_rx_chns(struct am65_cpsw_common *common)
+static void am65_cpsw_nuss_free_rx_chns(void *data)
+{
+ struct am65_cpsw_common *common = data;
+ struct am65_cpsw_rx_chn *rx_chn;
+
+ rx_chn = &common->rx_chns;
+
+ if (!IS_ERR_OR_NULL(rx_chn->desc_pool))
+ k3_cppi_desc_pool_destroy(rx_chn->desc_pool);
+
+ if (!IS_ERR_OR_NULL(rx_chn->rx_chn))
+ k3_udma_glue_release_rx_chn(rx_chn->rx_chn);
+}
+
+static void am65_cpsw_nuss_remove_rx_chns(void *data)
{
+ struct am65_cpsw_common *common = data;
struct am65_cpsw_rx_chn *rx_chn;
+ struct device *dev = common->dev;

rx_chn = &common->rx_chns;
+ devm_remove_action(dev, am65_cpsw_nuss_free_rx_chns, common);

if (!(rx_chn->irq < 0))
- devm_free_irq(common->dev, rx_chn->irq, common);
+ devm_free_irq(dev, rx_chn->irq, common);
+
+ netif_napi_del(&common->napi_rx);

if (!IS_ERR_OR_NULL(rx_chn->desc_pool))
k3_cppi_desc_pool_destroy(rx_chn->desc_pool);

if (!IS_ERR_OR_NULL(rx_chn->rx_chn))
k3_udma_glue_release_rx_chn(rx_chn->rx_chn);
+
+ common->rx_flow_id_base = -1;
}

static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
@@ -1709,7 +1698,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)

rx_cfg.swdata_size = AM65_CPSW_NAV_SW_DATA_SIZE;
rx_cfg.flow_id_num = AM65_CPSW_MAX_RX_FLOWS;
- rx_cfg.flow_id_base = -1;
+ rx_cfg.flow_id_base = common->rx_flow_id_base;

/* init all flows */
rx_chn->dev = dev;
@@ -1781,20 +1770,24 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
}
}

+ netif_napi_add(common->dma_ndev, &common->napi_rx,
+ am65_cpsw_nuss_rx_poll);
+
ret = devm_request_irq(dev, rx_chn->irq,
am65_cpsw_nuss_rx_irq,
IRQF_TRIGGER_HIGH, dev_name(dev), common);
if (ret) {
dev_err(dev, "failure requesting rx irq %u, %d\n",
rx_chn->irq, ret);
- rx_chn->irq = -EINVAL;
goto err;
}

- return 0;
-
err:
- am65_cpsw_nuss_free_rx_chns(common);
+ i = devm_add_action(dev, am65_cpsw_nuss_free_rx_chns, common);
+ if (i) {
+ dev_err(dev, "Failed to add free_rx_chns action %d\n", i);
+ return i;
+ }

return ret;
}
@@ -2114,24 +2107,33 @@ static int am65_cpsw_nuss_init_ndevs(struct am65_cpsw_common *common)
return ret;
}

- netif_napi_add(common->dma_ndev, &common->napi_rx,
- am65_cpsw_nuss_rx_poll);
-
return ret;
}

static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common)
{
- int i;
+ struct device *dev = common->dev;
+ int i, ret = 0;

for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];

netif_napi_add_tx(common->dma_ndev, &tx_chn->napi_tx,
am65_cpsw_nuss_tx_poll);
+
+ ret = devm_request_irq(dev, tx_chn->irq,
+ am65_cpsw_nuss_tx_irq,
+ IRQF_TRIGGER_HIGH,
+ tx_chn->tx_chn_name, tx_chn);
+ if (ret) {
+ dev_err(dev, "failure requesting tx%u irq %u, %d\n",
+ tx_chn->id, tx_chn->irq, ret);
+ goto err;
+ }
}

- return 0;
+err:
+ return ret;
}

static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
@@ -2597,7 +2599,11 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
struct am65_cpsw_port *port;
int ret = 0, i;

- ret = am65_cpsw_nuss_ndev_add_tx_napi(common);
+ /* init tx channels */
+ ret = am65_cpsw_nuss_init_tx_chns(common);
+ if (ret)
+ return ret;
+ ret = am65_cpsw_nuss_init_rx_chns(common);
if (ret)
return ret;

@@ -2645,10 +2651,8 @@ int am65_cpsw_nuss_update_tx_chns(struct am65_cpsw_common *common, int num_tx)

common->tx_ch_num = num_tx;
ret = am65_cpsw_nuss_init_tx_chns(common);
- if (ret)
- return ret;

- return am65_cpsw_nuss_ndev_add_tx_napi(common);
+ return ret;
}

struct am65_cpsw_soc_pdata {
@@ -2756,6 +2760,7 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
if (common->port_num < 1 || common->port_num > AM65_CPSW_MAX_PORTS)
return -ENOENT;

+ common->rx_flow_id_base = -1;
init_completion(&common->tdown_complete);
common->tx_ch_num = 1;
common->pf_p0_rx_ptype_rrobin = false;
@@ -2918,6 +2923,9 @@ static int am65_cpsw_nuss_suspend(struct device *dev)

am65_cpts_suspend(common->cpts);

+ am65_cpsw_nuss_remove_rx_chns(common);
+ am65_cpsw_nuss_remove_tx_chns(common);
+
return 0;
}

@@ -2929,6 +2937,17 @@ static int am65_cpsw_nuss_resume(struct device *dev)
int i, ret;
struct am65_cpsw_host *host_p = am65_common_get_host(common);

+ ret = am65_cpsw_nuss_init_tx_chns(common);
+ if (ret)
+ return ret;
+ ret = am65_cpsw_nuss_init_rx_chns(common);
+ if (ret)
+ return ret;
+
+ /* If RX IRQ was disabled before suspend, keep it disabled */
+ if (common->rx_irq_disabled)
+ disable_irq(common->rx_chns.irq);
+
am65_cpts_resume(common->cpts);

for (i = 0; i < common->port_num; i++) {
--
2.17.1