netdev - [PATCH RFC v4 net-next 12/13] pds_core: publish events to the clients

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Date:   Tue, 7 Mar 2023 21:13:09 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC:     <drivers@...sando.io>, <leon@...nel.org>, <jiri@...nulli.us>
Subject: [PATCH RFC v4 net-next 12/13] pds_core: publish events to the clients

When the Core device gets an event from the device, or notices
the device FW to be up or down, it needs to send those events
on to the clients that have an event handler.  Add the code to
pass along the events to the clients.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/amd/pds_core/adminq.c |  2 ++
 drivers/net/ethernet/amd/pds_core/core.c   | 34 ++++++++++++++++++++++
 include/linux/pds/pds_core.h               |  3 ++
 3 files changed, 39 insertions(+)

diff --git a/drivers/net/ethernet/amd/pds_core/adminq.c b/drivers/net/ethernet/amd/pds_core/adminq.c
index c063e269c1d6..f6b6307390ec 100644
--- a/drivers/net/ethernet/amd/pds_core/adminq.c
+++ b/drivers/net/ethernet/amd/pds_core/adminq.c
@@ -28,11 +28,13 @@ static int pdsc_process_notifyq(struct pdsc_qcq *qcq)
 		case PDS_EVENT_LINK_CHANGE:
 			dev_info(pdsc->dev, "NotifyQ LINK_CHANGE ecode %d eid %lld\n",
 				 ecode, eid);
+			pdsc_notify(pdsc, PDS_EVENT_LINK_CHANGE, comp);
 			break;
 
 		case PDS_EVENT_RESET:
 			dev_info(pdsc->dev, "NotifyQ RESET ecode %d eid %lld\n",
 				 ecode, eid);
+			pdsc_notify(pdsc, PDS_EVENT_RESET, comp);
 			break;
 
 		case PDS_EVENT_XCVR:
diff --git a/drivers/net/ethernet/amd/pds_core/core.c b/drivers/net/ethernet/amd/pds_core/core.c
index 96b0522c0306..8e9999049595 100644
--- a/drivers/net/ethernet/amd/pds_core/core.c
+++ b/drivers/net/ethernet/amd/pds_core/core.c
@@ -7,6 +7,25 @@
 
 #include <linux/pds/pds_adminq.h>
 
+static BLOCKING_NOTIFIER_HEAD(pds_notify_chain);
+
+int pdsc_register_notify(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&pds_notify_chain, nb);
+}
+EXPORT_SYMBOL_GPL(pdsc_register_notify);
+
+void pdsc_unregister_notify(struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&pds_notify_chain, nb);
+}
+EXPORT_SYMBOL_GPL(pdsc_unregister_notify);
+
+void pdsc_notify(struct pdsc *pdsc, unsigned long event, void *data)
+{
+	blocking_notifier_call_chain(&pds_notify_chain, event, data);
+}
+
 void pdsc_intr_free(struct pdsc *pdsc, int index)
 {
 	struct pdsc_intr_info *intr_info;
@@ -507,6 +526,11 @@ void pdsc_stop(struct pdsc *pdsc)
 
 static void pdsc_fw_down(struct pdsc *pdsc)
 {
+	union pds_core_notifyq_comp reset_event = {
+		.reset.ecode = cpu_to_le16(PDS_EVENT_RESET),
+		.reset.state = 0,
+	};
+
 	mutex_lock(&pdsc->config_lock);
 
 	if (test_and_set_bit(PDSC_S_FW_DEAD, &pdsc->state)) {
@@ -515,6 +539,9 @@ static void pdsc_fw_down(struct pdsc *pdsc)
 		return;
 	}
 
+	/* Notify clients of fw_down */
+	pdsc_notify(pdsc, PDS_EVENT_RESET, &reset_event);
+
 	pdsc_mask_interrupts(pdsc);
 	pdsc_teardown(pdsc, PDSC_TEARDOWN_RECOVERY);
 
@@ -523,6 +550,10 @@ static void pdsc_fw_down(struct pdsc *pdsc)
 
 static void pdsc_fw_up(struct pdsc *pdsc)
 {
+	union pds_core_notifyq_comp reset_event = {
+		.reset.ecode = cpu_to_le16(PDS_EVENT_RESET),
+		.reset.state = 1,
+	};
 	int err;
 
 	mutex_lock(&pdsc->config_lock);
@@ -543,6 +574,9 @@ static void pdsc_fw_up(struct pdsc *pdsc)
 
 	mutex_unlock(&pdsc->config_lock);
 
+	/* Notify clients of fw_up */
+	pdsc_notify(pdsc, PDS_EVENT_RESET, &reset_event);
+
 	return;
 
 err_out:
diff --git a/include/linux/pds/pds_core.h b/include/linux/pds/pds_core.h
index e6d18f219033..3f6cbef4e8f2 100644
--- a/include/linux/pds/pds_core.h
+++ b/include/linux/pds/pds_core.h
@@ -305,6 +305,9 @@ int pdsc_start(struct pdsc *pdsc);
 void pdsc_stop(struct pdsc *pdsc);
 void pdsc_health_thread(struct work_struct *work);
 
+int pdsc_register_notify(struct notifier_block *nb);
+void pdsc_unregister_notify(struct notifier_block *nb);
+void pdsc_notify(struct pdsc *pdsc, unsigned long event, void *data);
 int pdsc_auxbus_dev_add_vf(struct pdsc *pdsc_vf, struct pdsc *pdsc_pf);
 int pdsc_auxbus_dev_del_vf(struct pdsc *pdsc_vf, struct pdsc *pdsc_pf);
 
-- 
2.17.1