net: mana: Handle unsupported HWC commands

JIRA: https://issues.redhat.com/browse/RHEL-109583

commit ca8ac48
Author: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
Date:   Tue Jun 17 00:17:36 2025 -0700

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

Conflict: missing 'net: mana: Add support for net_shaper_ops'

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>

Author: Maxim Levitsky

drivers/net/ethernet/microsoft/mana/hw_channel.c

@@ -890,6 +890,10 @@ 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);

drivers/net/ethernet/microsoft/mana/mana_en.c

@@ -773,6 +773,9 @@ 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)
 			dev_err(dev, "Failed to send mana message: %d, 0x%x\n",
 				err, resp->status);

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.