Revert "net: ena: ethtool: add extra properties retrieval via get_priv_flags"

This reverts commit 315c28d2b714 ("net: ena: ethtool: add extra properties retrieval via get_priv_flags").

As discussed at netconf and on the mailing list we can't allow
for the the abuse of private flags for exposing arbitrary device
labels.

Signed-off-by: Jakub Kicinski <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/amazon/ena/ena_admin_defs.h

···
 #ifndef _ENA_ADMIN_H_
 #define _ENA_ADMIN_H_
 
-#define ENA_ADMIN_EXTRA_PROPERTIES_STRING_LEN 32
-#define ENA_ADMIN_EXTRA_PROPERTIES_COUNT     32
 
 enum ena_admin_aq_opcode {
 	ENA_ADMIN_CREATE_SQ                         = 1,
···
 	ENA_ADMIN_MAX_QUEUES_NUM                    = 2,
 	ENA_ADMIN_HW_HINTS                          = 3,
 	ENA_ADMIN_LLQ                               = 4,
-	ENA_ADMIN_EXTRA_PROPERTIES_STRINGS          = 5,
-	ENA_ADMIN_EXTRA_PROPERTIES_FLAGS            = 6,
 	ENA_ADMIN_MAX_QUEUES_EXT                    = 7,
 	ENA_ADMIN_RSS_HASH_FUNCTION                 = 10,
 	ENA_ADMIN_STATELESS_OFFLOAD_CONFIG          = 11,
···
 	u32 mtu;
 };
 
-struct ena_admin_get_extra_properties_strings_desc {
-	u32 count;
-};
-
-struct ena_admin_get_extra_properties_flags_desc {
-	u32 flags;
-};
-
 struct ena_admin_set_feature_host_attr_desc {
 	/* host OS info base address in OS memory. host info is 4KB of
 	 * physically contiguous
···
 		struct ena_admin_feature_intr_moder_desc intr_moderation;
 
 		struct ena_admin_ena_hw_hints hw_hints;
-
-		struct ena_admin_get_extra_properties_strings_desc extra_properties_strings;
-
-		struct ena_admin_get_extra_properties_flags_desc extra_properties_flags;
 	} u;
 };
 

drivers/net/ethernet/amazon/ena/ena_com.c

···
 	return ena_com_get_feature(ena_dev, resp, ENA_ADMIN_LINK_CONFIG, 0);
 }
 
-int ena_com_extra_properties_strings_init(struct ena_com_dev *ena_dev)
-{
-	struct ena_admin_get_feat_resp resp;
-	struct ena_extra_properties_strings *extra_properties_strings =
-			&ena_dev->extra_properties_strings;
-	u32 rc;
-
-	extra_properties_strings->size = ENA_ADMIN_EXTRA_PROPERTIES_COUNT *
-		ENA_ADMIN_EXTRA_PROPERTIES_STRING_LEN;
-
-	extra_properties_strings->virt_addr =
-		dma_alloc_coherent(ena_dev->dmadev,
-				   extra_properties_strings->size,
-				   &extra_properties_strings->dma_addr,
-				   GFP_KERNEL);
-	if (unlikely(!extra_properties_strings->virt_addr)) {
-		pr_err("Failed to allocate extra properties strings\n");
-		return 0;
-	}
-
-	rc = ena_com_get_feature_ex(ena_dev, &resp,
-				    ENA_ADMIN_EXTRA_PROPERTIES_STRINGS,
-				    extra_properties_strings->dma_addr,
-				    extra_properties_strings->size, 0);
-	if (rc) {
-		pr_debug("Failed to get extra properties strings\n");
-		goto err;
-	}
-
-	return resp.u.extra_properties_strings.count;
-err:
-	ena_com_delete_extra_properties_strings(ena_dev);
-	return 0;
-}
-
-void ena_com_delete_extra_properties_strings(struct ena_com_dev *ena_dev)
-{
-	struct ena_extra_properties_strings *extra_properties_strings =
-				&ena_dev->extra_properties_strings;
-
-	if (extra_properties_strings->virt_addr) {
-		dma_free_coherent(ena_dev->dmadev,
-				  extra_properties_strings->size,
-				  extra_properties_strings->virt_addr,
-				  extra_properties_strings->dma_addr);
-		extra_properties_strings->virt_addr = NULL;
-	}
-}
-
-int ena_com_get_extra_properties_flags(struct ena_com_dev *ena_dev,
-				       struct ena_admin_get_feat_resp *resp)
-{
-	return ena_com_get_feature(ena_dev, resp,
-				   ENA_ADMIN_EXTRA_PROPERTIES_FLAGS, 0);
-}
-
 int ena_com_get_dev_attr_feat(struct ena_com_dev *ena_dev,
 			      struct ena_com_dev_get_features_ctx *get_feat_ctx)
 {

drivers/net/ethernet/amazon/ena/ena_com.h

···
 	dma_addr_t host_info_dma_addr;
 };
 
-struct ena_extra_properties_strings {
-	u8 *virt_addr;
-	dma_addr_t dma_addr;
-	u32 size;
-};
-
 /* Each ena_dev is a PCI function. */
 struct ena_com_dev {
 	struct ena_com_admin_queue admin_queue;
···
 	struct ena_intr_moder_entry *intr_moder_tbl;
 
 	struct ena_com_llq_info llq_info;
-	struct ena_extra_properties_strings extra_properties_strings;
 };
 
 struct ena_com_dev_get_features_ctx {
···
  */
 int ena_com_get_link_params(struct ena_com_dev *ena_dev,
 			    struct ena_admin_get_feat_resp *resp);
-
-/* ena_com_extra_properties_strings_init - Initialize the extra properties strings buffer.
- * @ena_dev: ENA communication layer struct
- *
- * Initialize the extra properties strings buffer.
- */
-int ena_com_extra_properties_strings_init(struct ena_com_dev *ena_dev);
-
-/* ena_com_delete_extra_properties_strings - Free the extra properties strings buffer.
- * @ena_dev: ENA communication layer struct
- *
- * Free the allocated extra properties strings buffer.
- */
-void ena_com_delete_extra_properties_strings(struct ena_com_dev *ena_dev);
-
-/* ena_com_get_extra_properties_flags - Retrieve extra properties flags.
- * @ena_dev: ENA communication layer struct
- * @resp: Extra properties flags.
- *
- * Retrieve the extra properties flags.
- *
- * @return - 0 on Success negative value otherwise.
- */
-int ena_com_get_extra_properties_flags(struct ena_com_dev *ena_dev,
-				       struct ena_admin_get_feat_resp *resp);
 
 /* ena_com_get_dma_width - Retrieve physical dma address width the device
  * supports.

drivers/net/ethernet/amazon/ena/ena_ethtool.c

···
 	ena_dev_admin_queue_stats(adapter, &data);
 }
 
-static int get_stats_sset_count(struct ena_adapter *adapter)
-{
-	return  adapter->num_queues * (ENA_STATS_ARRAY_TX + ENA_STATS_ARRAY_RX)
-		+ ENA_STATS_ARRAY_GLOBAL + ENA_STATS_ARRAY_ENA_COM;
-}
-
 int ena_get_sset_count(struct net_device *netdev, int sset)
 {
 	struct ena_adapter *adapter = netdev_priv(netdev);
 
-	switch (sset) {
-	case ETH_SS_STATS:
-		return get_stats_sset_count(adapter);
-	case ETH_SS_PRIV_FLAGS:
-		return adapter->ena_extra_properties_count;
-	default:
+	if (sset != ETH_SS_STATS)
 		return -EOPNOTSUPP;
-	}
+
+	return  adapter->num_queues * (ENA_STATS_ARRAY_TX + ENA_STATS_ARRAY_RX)
+		+ ENA_STATS_ARRAY_GLOBAL + ENA_STATS_ARRAY_ENA_COM;
 }
 
 static void ena_queue_strings(struct ena_adapter *adapter, u8 **data)
···
 	}
 }
 
-static void get_stats_strings(struct ena_adapter *adapter, u8 *data)
-{
-	const struct ena_stats *ena_stats;
-	int i;
-
-	for (i = 0; i < ENA_STATS_ARRAY_GLOBAL; i++) {
-		ena_stats = &ena_stats_global_strings[i];
-		memcpy(data, ena_stats->name, ETH_GSTRING_LEN);
-		data += ETH_GSTRING_LEN;
-	}
-	ena_queue_strings(adapter, &data);
-	ena_com_dev_strings(&data);
-}
-
-static void get_private_flags_strings(struct ena_adapter *adapter, u8 *data)
-{
-	struct ena_com_dev *ena_dev = adapter->ena_dev;
-	u8 *strings = ena_dev->extra_properties_strings.virt_addr;
-	int i;
-
-	if (unlikely(!strings)) {
-		adapter->ena_extra_properties_count = 0;
-		return;
-	}
-
-	for (i = 0; i < adapter->ena_extra_properties_count; i++) {
-		strlcpy(data, strings + ENA_ADMIN_EXTRA_PROPERTIES_STRING_LEN * i,
-			ETH_GSTRING_LEN);
-		data += ETH_GSTRING_LEN;
-	}
-}
-
 static void ena_get_strings(struct net_device *netdev, u32 sset, u8 *data)
 {
 	struct ena_adapter *adapter = netdev_priv(netdev);
+	const struct ena_stats *ena_stats;
+	int i;
 
-	switch (sset) {
-	case ETH_SS_STATS:
-		get_stats_strings(adapter, data);
-		break;
-	case ETH_SS_PRIV_FLAGS:
-		get_private_flags_strings(adapter, data);
-		break;
-	default:
-		break;
+	if (sset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < ENA_STATS_ARRAY_GLOBAL; i++) {
+		ena_stats = &ena_stats_global_strings[i];
+
+		memcpy(data, ena_stats->name, ETH_GSTRING_LEN);
+		data += ETH_GSTRING_LEN;
 	}
+
+	ena_queue_strings(adapter, &data);
+	ena_com_dev_strings(&data);
 }
 
 static int ena_get_link_ksettings(struct net_device *netdev,
···
 	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 	strlcpy(info->bus_info, pci_name(adapter->pdev),
 		sizeof(info->bus_info));
-	info->n_priv_flags = adapter->ena_extra_properties_count;
 }
 
 static void ena_get_ringparam(struct net_device *netdev,
···
 	return ret;
 }
 
-static u32 ena_get_priv_flags(struct net_device *netdev)
-{
-	struct ena_adapter *adapter = netdev_priv(netdev);
-	struct ena_com_dev *ena_dev = adapter->ena_dev;
-	struct ena_admin_get_feat_resp get_resp;
-	u32 rc;
-
-	rc = ena_com_get_extra_properties_flags(ena_dev, &get_resp);
-	if (!rc)
-		return get_resp.u.extra_properties_flags.flags;
-
-	return 0;
-}
-
 static const struct ethtool_ops ena_ethtool_ops = {
 	.get_link_ksettings	= ena_get_link_ksettings,
 	.get_drvinfo		= ena_get_drvinfo,
···
 	.get_channels		= ena_get_channels,
 	.get_tunable		= ena_get_tunable,
 	.set_tunable		= ena_set_tunable,
-	.get_priv_flags		= ena_get_priv_flags,
 };
 
 void ena_set_ethtool_ops(struct net_device *netdev)

drivers/net/ethernet/amazon/ena/ena_netdev.c

···
 	ena_com_delete_debug_area(adapter->ena_dev);
 }
 
-static void ena_extra_properties_strings_destroy(struct net_device *netdev)
-{
-	struct ena_adapter *adapter = netdev_priv(netdev);
-
-	ena_com_delete_extra_properties_strings(adapter->ena_dev);
-	adapter->ena_extra_properties_count = 0;
-}
-
 static void ena_get_stats64(struct net_device *netdev,
 			    struct rtnl_link_stats64 *stats)
 {
···
 
 	ena_config_debug_area(adapter);
 
-	adapter->ena_extra_properties_count =
-		ena_com_extra_properties_strings_init(ena_dev);
-
 	memcpy(adapter->netdev->perm_addr, adapter->mac_addr, netdev->addr_len);
 
 	netif_carrier_off(netdev);
···
 	return 0;
 
 err_rss:
-	ena_extra_properties_strings_destroy(netdev);
 	ena_com_delete_debug_area(ena_dev);
 	ena_com_rss_destroy(ena_dev);
 err_free_msix:
···
 	ena_com_delete_debug_area(ena_dev);
 
 	ena_com_delete_host_info(ena_dev);
-
-	ena_extra_properties_strings_destroy(netdev);
 
 	ena_release_bars(ena_dev, pdev);
 

drivers/net/ethernet/amazon/ena/ena_netdev.h

···
 	u32 last_monitored_tx_qid;
 
 	enum ena_regs_reset_reason_types reset_reason;
-
-	u8 ena_extra_properties_count;
 };
 
 void ena_set_ethtool_ops(struct net_device *netdev);