Re: [PATCH v2 net-next 03/26] ena: implement generic XDP statistics callbacks

[Shay Agroskin <shayagr@amazon.com>]

Alexander Lobakin <alexandr.lobakin@intel.com> writes:

> ena driver has 6 XDP counters collected per-channel. Add 
> callbacks
> for getting the number of channels and those counters using 
> generic
> XDP stats infra.
>
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> ---
>  drivers/net/ethernet/amazon/ena/ena_netdev.c | 53 
>  ++++++++++++++++++++
>  1 file changed, 53 insertions(+)
>
> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c 
> b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> index 7d5d885d85d5..83e9b85cc998 100644
> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> @@ -3313,12 +3313,65 @@ static void ena_get_stats64(struct 
> net_device *netdev,
>  	stats->tx_errors = 0;
>  }
>
> +static int ena_get_xdp_stats_nch(const struct net_device 
> *netdev, u32 attr_id)
> +{
> +	const struct ena_adapter *adapter = netdev_priv(netdev);
> +
> +	switch (attr_id) {
> +	case IFLA_XDP_XSTATS_TYPE_XDP:
> +		return adapter->num_io_queues;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +}
> +
> +static int ena_get_xdp_stats(const struct net_device *netdev, 
> u32 attr_id,
> +			     void *attr_data)
> +{
> +	const struct ena_adapter *adapter = netdev_priv(netdev);
> +	struct ifla_xdp_stats *xdp_stats = attr_data;
> +	u32 i;
> +
> +	switch (attr_id) {
> +	case IFLA_XDP_XSTATS_TYPE_XDP:
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	for (i = 0; i < adapter->num_io_queues; i++) {
> +		const struct u64_stats_sync *syncp;
> +		const struct ena_stats_rx *stats;
> +		u32 start;
> +
> +		stats = &adapter->rx_ring[i].rx_stats;
> +		syncp = &adapter->rx_ring[i].syncp;
> +
> +		do {
> +			start = u64_stats_fetch_begin_irq(syncp);
> +
> +			xdp_stats->drop = stats->xdp_drop;
> +			xdp_stats->pass = stats->xdp_pass;
> +			xdp_stats->tx = stats->xdp_tx;
> +			xdp_stats->redirect = stats->xdp_redirect;
> +			xdp_stats->aborted = stats->xdp_aborted;
> +			xdp_stats->invalid = stats->xdp_invalid;
> +		} while (u64_stats_fetch_retry_irq(syncp, start));
> +
> +		xdp_stats++;
> +	}
> +
> +	return 0;
> +}
> +

Hi,
thank you for the time you took in adding ENA support, this code 
doesn't update the XDP TX queues (which only available when an XDP 
program is loaded).

In theory the following patch should fix it, but I was unable to 
compile your version of iproute2 and test the patch properly. Can 
you please let me know if I need to do anything special to bring 
up your version of iproute2 and test this patch?

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c 
b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 7d5d885d8..4e89a7d60 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -3313,12 +3313,85 @@ static void ena_get_stats64(struct 
net_device *netdev,
 	stats->tx_errors = 0;
 }
 
+static int ena_get_xdp_stats_nch(const struct net_device *netdev, 
u32 attr_id)
+{
+	const struct ena_adapter *adapter = netdev_priv(netdev);
+
+	switch (attr_id) {
+	case IFLA_XDP_XSTATS_TYPE_XDP:
+		return adapter->num_io_queues;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int ena_get_xdp_stats(const struct net_device *netdev, u32 
attr_id,
+			     void *attr_data)
+{
+	const struct ena_adapter *adapter = netdev_priv(netdev);
+	struct ifla_xdp_stats *xdp_stats = attr_data;
+	const struct u64_stats_sync *syncp;
+	u32 start;
+	u32 i;
+
+	switch (attr_id) {
+	case IFLA_XDP_XSTATS_TYPE_XDP:
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	for (i = 0; i < adapter->num_io_queues; i++) {
+		const struct ena_stats_rx *rx_stats;
+
+		rx_stats = &adapter->rx_ring[i].rx_stats;
+		syncp = &adapter->rx_ring[i].syncp;
+
+		do {
+			start = u64_stats_fetch_begin_irq(syncp);
+
+			xdp_stats->drop = rx_stats->xdp_drop;
+			xdp_stats->pass = rx_stats->xdp_pass;
+			xdp_stats->tx = rx_stats->xdp_tx;
+			xdp_stats->redirect = 
rx_stats->xdp_redirect;
+			xdp_stats->aborted = 
rx_stats->xdp_aborted;
+			xdp_stats->invalid = 
rx_stats->xdp_invalid;
+		} while (u64_stats_fetch_retry_irq(syncp, start));
+
+		xdp_stats++;
+	}
+
+	xdp_stats = attr_data;
+	/* xdp_num_queues can be 0 if an XDP program isn't loaded 
*/
+	for (i = 0; i < adapter->xdp_num_queues; i++) {
+		const struct ena_stats_tx *tx_stats;
+
+		tx_stats = 
&adapter->rx_ring[i].xdp_ring->tx_stats;
+		syncp = &adapter->rx_ring[i].xdp_ring->syncp;
+
+		do {
+			start = u64_stats_fetch_begin_irq(syncp);
+
+			xdp_stats->xmit_packets = tx_stats->cnt;
+			xdp_stats->xmit_bytes = tx_stats->bytes;
+			xdp_stats->xmit_errors = 
tx_stats->dma_mapping_err +
+ 
tx_stats->prepare_ctx_err;
+		} while (u64_stats_fetch_retry_irq(syncp, start));
+
+		xdp_stats++;
+	}
+
+	return 0;
+}
+
 static const struct net_device_ops ena_netdev_ops = {
 	.ndo_open		= ena_open,
 	.ndo_stop		= ena_close,
 	.ndo_start_xmit		= ena_start_xmit,
 	.ndo_select_queue	= ena_select_queue,
 	.ndo_get_stats64	= ena_get_stats64,
+	.ndo_get_xdp_stats_nch	= ena_get_xdp_stats_nch,
+	.ndo_get_xdp_stats	= ena_get_xdp_stats,
 	.ndo_tx_timeout		= ena_tx_timeout,
 	.ndo_change_mtu		= ena_change_mtu,
 	.ndo_set_mac_address	= NULL,