linux-kernel - [PATCH 3/3] net: mana: Handle unsupported HWC commands

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Message-Id: <1742473341-15262-4-git-send-email-ernis@linux.microsoft.com>
Date: Thu, 20 Mar 2025 05:22:21 -0700
From: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	longli@...rosoft.com,
	kotaranov@...rosoft.com,
	horms@...nel.org,
	brett.creeley@....com,
	ernis@...ux.microsoft.com,
	surenb@...gle.com,
	schakrabarti@...ux.microsoft.com,
	kent.overstreet@...ux.dev,
	shradhagupta@...ux.microsoft.com,
	erick.archer@...look.com,
	rosenp@...il.com,
	linux-hyperv@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org
Subject: [PATCH 3/3] net: mana: Handle unsupported HWC commands

If any of the HWC commands are not recognized by the
underlying hardware, the hardware returns the response
header status of -1. Log the information using
netdev_info_once to avoid multiple error logs in dmesg.

Signed-off-by: Erni Sri Satya Vennela <ernis@...ux.microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
Reviewed-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
---
 drivers/net/ethernet/microsoft/mana/hw_channel.c |  4 ++++
 drivers/net/ethernet/microsoft/mana/mana_en.c    | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
index a00f915c5188..280218895c0e 100644
--- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
+++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
@@ -867,6 +867,10 @@ int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
 	}
 
 	if (ctx->status_code && ctx->status_code != GDMA_STATUS_MORE_ENTRIES) {
+		if (ctx->status_code == -1) {
+			err = -EOPNOTSUPP;
+			goto out;
+		}
 		dev_err(hwc->dev, "HWC: Failed hw_channel req: 0x%x\n",
 			ctx->status_code);
 		err = -EPROTO;
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index bcc273427423..898d18b220b8 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -779,6 +779,9 @@ static int mana_send_request(struct mana_context *ac, void *in_buf,
 	err = mana_gd_send_request(gc, in_len, in_buf, out_len,
 				   out_buf);
 	if (err || resp->status) {
+		if (err == -EOPNOTSUPP)
+			return err;
+
 		dev_err(dev, "Failed to send mana message: %d, 0x%x\n",
 			err, resp->status);
 		return err ? err : -EPROTO;
@@ -1177,6 +1180,10 @@ int mana_query_link_cfg(struct mana_port_context *apc)
 				sizeof(resp));
 
 	if (err) {
+		if (err == -EOPNOTSUPP) {
+			netdev_info_once(ndev, "MANA_QUERY_LINK_CONFIG not supported\n");
+			goto out;
+		}
 		netdev_err(ndev, "Failed to query link config: %d\n", err);
 		goto out;
 	}
@@ -1220,6 +1227,10 @@ int mana_set_bw_clamp(struct mana_port_context *apc, u32 speed)
 				sizeof(resp));
 
 	if (err) {
+		if (err == -EOPNOTSUPP) {
+			netdev_info_once(ndev, "MANA_SET_BW_CLAMP not supported\n");
+			return err;
+		}
 		netdev_err(ndev, "Failed to set bandwidth clamp for speed %u, err = %d",
 			   speed, err);
 		return err;
-- 
2.34.1