nfp: add ethtool statistics for representors

Representors may be associated with both VFs or more importantly
with physical ports.  Allow vNIC and MAC statistics to be read
with ethtool -S on representors.  In case of vNICs we reuse
the vNIC statistic helper, we just need to swap RX and TX to
give statistics the "switch perspective."

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
index f33c341..07969f0 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -180,6 +180,7 @@ static const struct nfp_et_stat nfp_mac_et_stats[] = {
 };
 
 #define NN_ET_GLOBAL_STATS_LEN ARRAY_SIZE(nfp_net_et_stats)
+#define NN_ET_SWITCH_STATS_LEN 9
 #define NN_ET_RVEC_GATHER_STATS 7
 
 static void nfp_net_get_nspinfo(struct nfp_app *app, char *version)
@@ -497,11 +498,24 @@ nfp_vnic_get_hw_stats_count(unsigned int rx_rings, unsigned int tx_rings)
 
 static u8 *
 nfp_vnic_get_hw_stats_strings(u8 *data, unsigned int rx_rings,
-                             unsigned int tx_rings)
+                             unsigned int tx_rings, bool repr)
 {
-       int i;
+       int swap_off, i;
 
-       for (i = 0; i < NN_ET_GLOBAL_STATS_LEN; i++)
+       BUILD_BUG_ON(NN_ET_GLOBAL_STATS_LEN < NN_ET_SWITCH_STATS_LEN * 2);
+       /* If repr is true first add SWITCH_STATS_LEN and then subtract it
+        * effectively swapping the RX and TX statistics (giving us the RX
+        * and TX from perspective of the switch).
+        */
+       swap_off = repr * NN_ET_SWITCH_STATS_LEN;
+
+       for (i = 0; i < NN_ET_SWITCH_STATS_LEN; i++)
+               data = nfp_pr_et(data, nfp_net_et_stats[i + swap_off].name);
+
+       for (i = NN_ET_SWITCH_STATS_LEN; i < NN_ET_SWITCH_STATS_LEN * 2; i++)
+               data = nfp_pr_et(data, nfp_net_et_stats[i - swap_off].name);
+
+       for (i = NN_ET_SWITCH_STATS_LEN * 2; i < NN_ET_GLOBAL_STATS_LEN; i++)
                data = nfp_pr_et(data, nfp_net_et_stats[i].name);
 
        for (i = 0; i < tx_rings; i++) {
@@ -589,7 +603,8 @@ static void nfp_net_get_strings(struct net_device *netdev,
        case ETH_SS_STATS:
                data = nfp_vnic_get_sw_stats_strings(netdev, data);
                data = nfp_vnic_get_hw_stats_strings(data, nn->dp.num_rx_rings,
-                                                    nn->dp.num_tx_rings);
+                                                    nn->dp.num_tx_rings,
+                                                    false);
                data = nfp_mac_get_stats_strings(netdev, data);
                break;
        }
@@ -622,6 +637,50 @@ static int nfp_net_get_sset_count(struct net_device *netdev, int sset)
        }
 }
 
+static void nfp_port_get_strings(struct net_device *netdev,
+                                u32 stringset, u8 *data)
+{
+       struct nfp_port *port = nfp_port_from_netdev(netdev);
+
+       switch (stringset) {
+       case ETH_SS_STATS:
+               if (nfp_port_is_vnic(port))
+                       data = nfp_vnic_get_hw_stats_strings(data, 0, 0, true);
+               else
+                       data = nfp_mac_get_stats_strings(netdev, data);
+               break;
+       }
+}
+
+static void
+nfp_port_get_stats(struct net_device *netdev, struct ethtool_stats *stats,
+                  u64 *data)
+{
+       struct nfp_port *port = nfp_port_from_netdev(netdev);
+
+       if (nfp_port_is_vnic(port))
+               data = nfp_vnic_get_hw_stats(data, port->vnic, 0, 0);
+       else
+               data = nfp_mac_get_stats(netdev, data);
+}
+
+static int nfp_port_get_sset_count(struct net_device *netdev, int sset)
+{
+       struct nfp_port *port = nfp_port_from_netdev(netdev);
+       unsigned int count;
+
+       switch (sset) {
+       case ETH_SS_STATS:
+               if (nfp_port_is_vnic(port))
+                       count = nfp_vnic_get_hw_stats_count(0, 0);
+               else
+                       count = nfp_mac_get_stats_count(netdev);
+               return count;
+       default:
+               return -EOPNOTSUPP;
+       }
+}
+
 /* RX network flow classification (RSS, filters, etc)
  */
 static u32 ethtool_flow_to_nfp_flag(u32 flow_type)
@@ -1085,6 +1144,9 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
 const struct ethtool_ops nfp_port_ethtool_ops = {
        .get_drvinfo            = nfp_app_get_drvinfo,
        .get_link               = ethtool_op_get_link,
+       .get_strings            = nfp_port_get_strings,
+       .get_ethtool_stats      = nfp_port_get_stats,
+       .get_sset_count         = nfp_port_get_sset_count,
        .set_dump               = nfp_app_set_dump,
        .get_dump_flag          = nfp_app_get_dump_flag,
        .get_dump_data          = nfp_app_get_dump_data,

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_port.h b/drivers/net/ethernet/netronome/nfp/nfp_port.h
index 81c0340..51dcb9c 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/nfp_port.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_port.h
@@ -116,6 +116,11 @@ extern const struct switchdev_ops nfp_port_switchdev_ops;
 int nfp_port_setup_tc(struct net_device *netdev, enum tc_setup_type type,
                      void *type_data);
 
+static inline bool nfp_port_is_vnic(const struct nfp_port *port)
+{
+       return port->type == NFP_PORT_PF_PORT || port->type == NFP_PORT_VF_PORT;
+}
+
 struct nfp_port *nfp_port_from_netdev(struct net_device *netdev);
 struct nfp_port *
 nfp_port_from_id(struct nfp_pf *pf, enum nfp_port_type type, unsigned int id);