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new 2e9a43571a8 arch/imx9/ethernet: Add a configuration option to use
HPWORK queue
2e9a43571a8 is described below
commit 2e9a43571a87aab4af1d71661e70c6733c1707a3
Author: Jukka Laitinen <[email protected]>
AuthorDate: Fri Nov 28 16:14:51 2025 +0200
arch/imx9/ethernet: Add a configuration option to use HPWORK queue
Add an option to use HPWORK queue for ethernet driver, to reduce
delays if more time critical messaging via ethernet is wanted.
Signed-off-by: Jukka Laitinen <[email protected]>
---
arch/arm64/src/imx9/Kconfig | 9 +++++++++
arch/arm64/src/imx9/imx9_enet.c | 28 +++++++++++++++++++---------
2 files changed, 28 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/src/imx9/Kconfig b/arch/arm64/src/imx9/Kconfig
index 5e0a37e5d9e..72420e59126 100644
--- a/arch/arm64/src/imx9/Kconfig
+++ b/arch/arm64/src/imx9/Kconfig
@@ -1013,6 +1013,15 @@ config IMX9_ENET_USE_OTP_MAC
default n
depends on IMX9_ENET
+config IMX9_ENET_HPWORK
+ bool "Use high priority work queue for ethernet"
+ depends on IMX9_ENET
+ depends on SCHED_HPWORK
+ default n
+ ---help---
+ Use high-priority work-queue for ethernet packet handling.
+ Enable if low-latency ethernet packet handling is required.
+
config IMX9_ENET1_OTP_MAC_ADDR
hex "MAC address offset in OCOTP"
default 0x4ec
diff --git a/arch/arm64/src/imx9/imx9_enet.c b/arch/arm64/src/imx9/imx9_enet.c
index fd301dfcdb6..48bed4f266d 100644
--- a/arch/arm64/src/imx9/imx9_enet.c
+++ b/arch/arm64/src/imx9/imx9_enet.c
@@ -74,15 +74,22 @@
* Pre-processor Definitions
****************************************************************************/
-/* If processing is not done at the interrupt level, then work queue support
- * is required.
- */
+/* Select work queue for normal operation */
-#if !defined(CONFIG_SCHED_LPWORK)
-# error LPWORK queue support is required
-#endif
+# if defined(CONFIG_IMX9_ENET_HPWORK)
+# define ETHWORK HPWORK
+# else
+# define ETHWORK LPWORK
+# endif
-#define ETHWORK LPWORK
+/* LPWORK support is always required. Even if HPWORK were used for normal
+ * operation, timeouts are only handled in LPWORK since phy communication
+ * might cause delays due to polling
+ */
+
+# if !defined(CONFIG_SCHED_LPWORK)
+# error LPWORK queue support is required
+# endif
/* We need at least two TX buffers for reliable operation */
@@ -1282,10 +1289,13 @@ static void imx9_txtimeout_expiry(wdparm_t arg)
priv->ints = 0;
/* Schedule to perform the TX timeout processing on the worker thread,
- * canceling any pending interrupt work.
+ * canceling any pending interrupt work. Note: this runs always in the
+ * low-priority queue instead of ETHWORK. It is too intrusive for the
+ * high-priority queue, running ifdown / ifup sequence and communicating
+ * with PHY.
*/
- work_queue(ETHWORK, &priv->irqwork, imx9_txtimeout_work, priv, 0);
+ work_queue(LPWORK, &priv->irqwork, imx9_txtimeout_work, priv, 0);
}
/****************************************************************************
