[SRU][N:linux-azure][PATCH 4/5] net: mana: Handle unsupported HWC commands

[Vinicius Peixoto]

From: Erni Sri Satya Vennela <ernis at linux.microsoft.com>

BugLink: https://bugs.launchpad.net/bugs/2126592

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 at linux.microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz at microsoft.com>
Reviewed-by: Shradha Gupta <shradhagupta at linux.microsoft.com>
Reviewed-by: Saurabh Singh Sengar <ssengar at linux.microsoft.com>
Reviewed-by: Dipayaan Roy <dipayanroy at linux.microsoft.com>
Link: https://patch.msgid.link/1750144656-2021-5-git-send-email-ernis@linux.microsoft.com
Signed-off-by: Paolo Abeni <pabeni at redhat.com>

(backported from commit ca8ac489ca33c986ff02ee14c3e1c10b86355428)
[vpeixoto: fix context conflict in mana_send_request due to the
mana_need_log calls from d243977a9e69 ("net: mana: Handle Reset Request
from MANA NIC")]
Signed-off-by: Vinicius Peixoto <vinicius.peixoto at canonical.com>
---
 drivers/net/ethernet/microsoft/mana/hw_channel.c |  4 ++++
 drivers/net/ethernet/microsoft/mana/mana_en.c    | 11 +++++++++++
 include/net/mana/gdma.h                          |  1 +
 3 files changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
index 7e11bd2873e2..2a3036976cab 100644
--- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
+++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
@@ -892,6 +892,10 @@ 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 == GDMA_STATUS_CMD_UNSUPPORTED) {
+			err = -EOPNOTSUPP;
+			goto out;
+		}
 		if (req_msg->req.msg_type != MANA_QUERY_PHY_STAT)
 			dev_err(hwc->dev, "HWC: Failed hw_channel req: 0x%x\n",
 				ctx->status_code);
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index d7592a4c7546..c1f92e2e60bf 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -888,6 +888,9 @@ 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;
+
 		if (req->req.msg_type != MANA_QUERY_PHY_STAT &&
 		    mana_need_log(gc, err))
 			dev_err(dev, "Failed to send mana message: %d, 0x%x\n",
@@ -1302,6 +1305,10 @@ 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");
+			return err;
+		}
 		netdev_err(ndev, "Failed to query link config: %d\n", err);
 		return err;
 	}
@@ -1344,6 +1351,10 @@ 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;
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index b21dd9c0db75..ce4b305c75cf 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -10,6 +10,7 @@
 #include "shm_channel.h"
 
 #define GDMA_STATUS_MORE_ENTRIES	0x00000105
+#define GDMA_STATUS_CMD_UNSUPPORTED	0xffffffff
 
 /* Structures labeled with "HW DATA" are exchanged with the hardware. All of
  * them are naturally aligned and hence don't need __packed.
-- 
2.45.2