linux-kernel - [PATCH v2 04/14] net: ionic: Provide RDMA reset support for the RDMA driver

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Message-ID: <20250508045957.2823318-5-abhijit.gangurde@amd.com>
Date: Thu, 8 May 2025 10:29:47 +0530
From: Abhijit Gangurde <abhijit.gangurde@....com>
To: <shannon.nelson@....com>, <brett.creeley@....com>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<corbet@....net>, <jgg@...pe.ca>, <leon@...nel.org>, <andrew+netdev@...n.ch>
CC: <allen.hubbe@....com>, <nikhil.agarwal@....com>,
	<linux-rdma@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Abhijit Gangurde
	<abhijit.gangurde@....com>
Subject: [PATCH v2 04/14] net: ionic: Provide RDMA reset support for the RDMA driver

The Ethernet driver holds the privilege to execute the device commands.
Export the function to execute RDMA reset command for use by RDMA driver.

Reviewed-by: Shannon Nelson <shannon.nelson@....com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@....com>
---
 .../net/ethernet/pensando/ionic/ionic_api.h   |  9 ++++++++
 .../net/ethernet/pensando/ionic/ionic_aux.c   | 22 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_api.h b/drivers/net/ethernet/pensando/ionic/ionic_api.h
index d75902ca34af..e0b766d1769f 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_api.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_api.h
@@ -54,4 +54,13 @@ int ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
  */
 int ionic_error_to_errno(enum ionic_status_code code);
 
+/**
+ * ionic_request_rdma_reset - request reset or disable the device or lif
+ * @lif:        Logical interface
+ *
+ * The reset is triggered asynchronously. It will wait until reset request
+ * completes or times out.
+ */
+void ionic_request_rdma_reset(struct ionic_lif *lif);
+
 #endif /* _IONIC_API_H_ */
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_aux.c b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
index ba29c456de00..bbad848d2dce 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_aux.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
@@ -93,3 +93,25 @@ void ionic_auxbus_unregister(struct ionic_lif *lif)
 out:
 	mutex_unlock(&lif->adev_lock);
 }
+
+void ionic_request_rdma_reset(struct ionic_lif *lif)
+{
+	struct ionic *ionic = lif->ionic;
+	int err;
+
+	union ionic_dev_cmd cmd = {
+		.cmd.opcode = IONIC_CMD_RDMA_RESET_LIF,
+		.cmd.lif_index = cpu_to_le16(lif->index),
+	};
+
+	mutex_lock(&ionic->dev_cmd_lock);
+
+	ionic_dev_cmd_go(&ionic->idev, &cmd);
+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
+
+	mutex_unlock(&ionic->dev_cmd_lock);
+
+	if (err)
+		pr_warn("%s request_reset: error %d\n", __func__, err);
+}
+EXPORT_SYMBOL_NS(ionic_request_rdma_reset, "NET_IONIC");
-- 
2.34.1