gve: Add consumed counts to ethtool stats

Being able to see how many descriptors are in-use is helpful
when diagnosing certain issues.
Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Signed-off-by: Jordan Kim <jrkim@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/google/gve/gve_ethtool.c

@@ -42,7 +42,7 @@ static const char gve_gstrings_main_stats[][ETH_GSTRING_LEN] = {
 };
 
 static const char gve_gstrings_rx_stats[][ETH_GSTRING_LEN] = {
-	"rx_posted_desc[%u]", "rx_completed_desc[%u]", "rx_bytes[%u]",
+	"rx_posted_desc[%u]", "rx_completed_desc[%u]", "rx_consumed_desc[%u]", "rx_bytes[%u]",
 	"rx_cont_packet_cnt[%u]", "rx_frag_flip_cnt[%u]", "rx_frag_copy_cnt[%u]",
 	"rx_dropped_pkt[%u]", "rx_copybreak_pkt[%u]", "rx_copied_pkt[%u]",
 	"rx_queue_drop_cnt[%u]", "rx_no_buffers_posted[%u]",
@@ -50,7 +50,7 @@ static const char gve_gstrings_rx_stats[][ETH_GSTRING_LEN] = {
 };
 
 static const char gve_gstrings_tx_stats[][ETH_GSTRING_LEN] = {
-	"tx_posted_desc[%u]", "tx_completed_desc[%u]", "tx_bytes[%u]",
+	"tx_posted_desc[%u]", "tx_completed_desc[%u]", "tx_consumed_desc[%u]", "tx_bytes[%u]",
 	"tx_wake[%u]", "tx_stop[%u]", "tx_event_counter[%u]",
 	"tx_dma_mapping_error[%u]",
 };
@@ -139,10 +139,11 @@ static void
 gve_get_ethtool_stats(struct net_device *netdev,
 		      struct ethtool_stats *stats, u64 *data)
 {
-	u64 tmp_rx_pkts, tmp_rx_bytes, tmp_rx_skb_alloc_fail,	tmp_rx_buf_alloc_fail,
-		tmp_rx_desc_err_dropped_pkt, tmp_tx_pkts, tmp_tx_bytes;
+	u64 tmp_rx_pkts, tmp_rx_bytes, tmp_rx_skb_alloc_fail,
+		tmp_rx_buf_alloc_fail, tmp_rx_desc_err_dropped_pkt,
+		tmp_tx_pkts, tmp_tx_bytes;
 	u64 rx_buf_alloc_fail, rx_desc_err_dropped_pkt, rx_pkts,
-		rx_skb_alloc_fail, rx_bytes, tx_pkts, tx_bytes;
+		rx_skb_alloc_fail, rx_bytes, tx_pkts, tx_bytes, tx_dropped;
 	int stats_idx, base_stats_idx, max_stats_idx;
 	struct stats *report_stats;
 	int *rx_qid_to_stats_idx;
@@ -191,7 +192,7 @@ gve_get_ethtool_stats(struct net_device *netdev,
 			rx_desc_err_dropped_pkt += tmp_rx_desc_err_dropped_pkt;
 		}
 	}
-	for (tx_pkts = 0, tx_bytes = 0, ring = 0;
+	for (tx_pkts = 0, tx_bytes = 0, tx_dropped = 0, ring = 0;
 	     ring < priv->tx_cfg.num_queues; ring++) {
 		if (priv->tx) {
 			do {
@@ -203,6 +204,7 @@ gve_get_ethtool_stats(struct net_device *netdev,
 						       start));
 			tx_pkts += tmp_tx_pkts;
 			tx_bytes += tmp_tx_bytes;
+			tx_dropped += priv->tx[ring].dropped_pkt;
 		}
 	}
 
@@ -214,9 +216,7 @@ gve_get_ethtool_stats(struct net_device *netdev,
 	/* total rx dropped packets */
 	data[i++] = rx_skb_alloc_fail + rx_buf_alloc_fail +
 		    rx_desc_err_dropped_pkt;
-	/* Skip tx_dropped */
-	i++;
-
+	data[i++] = tx_dropped;
 	data[i++] = priv->tx_timeo_cnt;
 	data[i++] = rx_skb_alloc_fail;
 	data[i++] = rx_buf_alloc_fail;
@@ -255,6 +255,7 @@ gve_get_ethtool_stats(struct net_device *netdev,
 
 			data[i++] = rx->fill_cnt;
 			data[i++] = rx->cnt;
+			data[i++] = rx->fill_cnt - rx->cnt;
 			do {
 				start =
 				  u64_stats_fetch_begin(&priv->rx[ring].statss);
@@ -318,12 +319,14 @@ gve_get_ethtool_stats(struct net_device *netdev,
 			if (gve_is_gqi(priv)) {
 				data[i++] = tx->req;
 				data[i++] = tx->done;
+				data[i++] = tx->req - tx->done;
 			} else {
 				/* DQO doesn't currently support
 				 * posted/completed descriptor counts;
 				 */
 				data[i++] = 0;
 				data[i++] = 0;
+				data[i++] = tx->dqo_tx.tail - tx->dqo_tx.head;
 			}
 			do {
 				start =