gve: Add XDP REDIRECT support for GQI-QPL format

This patch contains the following changes:
1) Support for XDP REDIRECT action on rx
2) ndo_xdp_xmit callback support

In GQI-QPL queue format, the driver needs to allocate a fixed size
memory, the size specified by vNIC device, for RX/TX and register this
memory as a bounce buffer with the vNIC device when a queue is created.
The number of pages in the bounce buffer is limited and the pages need to
be made available to the vNIC by copying the RX data out to prevent
head-of-line blocking. The XDP_REDIRECT packets are therefore immediately
copied to a newly allocated page.

Signed-off-by: Praveen Kaligineedi <pkaligineedi@google.com>
Reviewed-by: Jeroen de Borst <jeroendb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 8 deletions

diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c
index 067b393ccf9d..23db0f3534a8 100644
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c
+++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
@@ -56,13 +56,14 @@ static const char gve_gstrings_rx_stats[][ETH_GSTRING_LEN] = {
 	"rx_drops_packet_over_mru[%u]", "rx_drops_invalid_checksum[%u]",
 	"rx_xdp_aborted[%u]", "rx_xdp_drop[%u]", "rx_xdp_pass[%u]",
 	"rx_xdp_tx[%u]", "rx_xdp_redirect[%u]",
-	"rx_xdp_tx_errors[%u]", "rx_xdp_redirect_errors[%u]",
+	"rx_xdp_tx_errors[%u]", "rx_xdp_redirect_errors[%u]", "rx_xdp_alloc_fails[%u]",
 };
 
 static const char gve_gstrings_tx_stats[][ETH_GSTRING_LEN] = {
 	"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]",
+	"tx_xdp_xmit[%u]", "tx_xdp_xmit_errors[%u]"
 };
 
 static const char gve_gstrings_adminq_stats[][ETH_GSTRING_LEN] = {
@@ -313,9 +314,10 @@ gve_get_ethtool_stats(struct net_device *netdev,
 					data[i + j] = rx->xdp_actions[j];
 				data[i + j++] = rx->xdp_tx_errors;
 				data[i + j++] = rx->xdp_redirect_errors;
+				data[i + j++] = rx->xdp_alloc_fails;
 			} while (u64_stats_fetch_retry(&priv->rx[ring].statss,
 						       start));
-			i += GVE_XDP_ACTIONS + 2; /* XDP rx counters */
+			i += GVE_XDP_ACTIONS + 3; /* XDP rx counters */
 		}
 	} else {
 		i += priv->rx_cfg.num_queues * NUM_GVE_RX_CNTS;
@@ -371,13 +373,21 @@ gve_get_ethtool_stats(struct net_device *netdev,
 			if (skip_nic_stats) {
 				/* skip NIC tx stats */
 				i += NIC_TX_STATS_REPORT_NUM;
-				continue;
-			}
-			for (j = 0; j < NIC_TX_STATS_REPORT_NUM; j++) {
-				u64 value =
-				be64_to_cpu(report_stats[tx_qid_to_stats_idx[ring] + j].value);
-				data[i++] = value;
+			} else {
+				stats_idx = tx_qid_to_stats_idx[ring];
+				for (j = 0; j < NIC_TX_STATS_REPORT_NUM; j++) {
+					u64 value =
+						be64_to_cpu(report_stats[stats_idx + j].value);
+					data[i++] = value;
+				}
 			}
+			do {
+				start = u64_stats_fetch_begin(&priv->tx[ring].statss);
+				data[i] = tx->xdp_xmit;
+				data[i + 1] = tx->xdp_xmit_errors;
+			} while (u64_stats_fetch_retry(&priv->tx[ring].statss,
+						       start));
+			i += 2; /* XDP tx counters */
 		}
 	} else {
 		i += num_tx_queues * NUM_GVE_TX_CNTS;