[Intel-wired-lan] [PATCH iwl-net 2/2] ice: use ice_update_eth_stats() for representor stats

[Petr Oros]

ice_repr_get_stats64() and __ice_get_ethtool_stats() call
ice_update_vsi_stats() on the VF's src_vsi. This always returns early
because ICE_VSI_DOWN is permanently set for VF VSIs — ice_up() is never
called on them since queues are managed by iavf through virtchnl.

In __ice_get_ethtool_stats() the original code called
ice_update_vsi_stats() for all VSIs including representors, iterated
over ice_gstrings_vsi_stats[] to populate the data, and then bailed out
with an early return before the per-queue ring stats section. That early
return was necessary because representor VSIs have no rings on the PF
side — the rings belong to the VF driver (iavf), so accessing per-queue
stats would be invalid.

Move the representor handling to the top of __ice_get_ethtool_stats()
and call ice_update_eth_stats() directly to read the hardware GLV_*
counters. This matches ice_get_vf_stats() which already uses
ice_update_eth_stats() for the same VF VSI in legacy mode. Apply the
same fix to ice_repr_get_stats64().

Note that ice_gstrings_vsi_stats[] contains five software ring counters
(rx_buf_failed, rx_page_failed, tx_linearize, tx_busy, tx_restart) that
are always zero for representors since the PF never processes packets on
VF rings. This is pre-existing behavior unchanged by this patch.

Fixes: 7aae80cef7ba ("ice: add port representor ethtool ops and stats")
Signed-off-by: Petr Oros <po...@redhat.com>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 14 +++++++++++---
 drivers/net/ethernet/intel/ice/ice_repr.c    |  3 ++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c 
b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 3565a5d96c6d18..0b8775621f1567 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -1926,6 +1926,17 @@ __ice_get_ethtool_stats(struct net_device *netdev,
        int i = 0;
        char *p;
 
+       if (ice_is_port_repr_netdev(netdev)) {
+               ice_update_eth_stats(vsi);
+
+               for (j = 0; j < ICE_VSI_STATS_LEN; j++) {
+                       p = (char *)vsi + ice_gstrings_vsi_stats[j].stat_offset;
+                       data[i++] = (ice_gstrings_vsi_stats[j].sizeof_stat ==
+                                    sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
+               }
+               return;
+       }
+
        ice_update_pf_stats(pf);
        ice_update_vsi_stats(vsi);
 
@@ -1935,9 +1946,6 @@ __ice_get_ethtool_stats(struct net_device *netdev,
                             sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
        }
 
-       if (ice_is_port_repr_netdev(netdev))
-               return;
-
        /* populate per queue stats */
        rcu_read_lock();
 
diff --git a/drivers/net/ethernet/intel/ice/ice_repr.c 
b/drivers/net/ethernet/intel/ice/ice_repr.c
index 2a84f656405828..f1e82ba155cff2 100644
--- a/drivers/net/ethernet/intel/ice/ice_repr.c
+++ b/drivers/net/ethernet/intel/ice/ice_repr.c
@@ -2,6 +2,7 @@
 /* Copyright (C) 2019-2021, Intel Corporation. */
 
 #include "ice.h"
+#include "ice_lib.h"
 #include "ice_eswitch.h"
 #include "devlink/devlink.h"
 #include "devlink/port.h"
@@ -67,7 +68,7 @@ ice_repr_get_stats64(struct net_device *netdev, struct 
rtnl_link_stats64 *stats)
                return;
        vsi = repr->src_vsi;
 
-       ice_update_vsi_stats(vsi);
+       ice_update_eth_stats(vsi);
        eth_stats = &vsi->eth_stats;
 
        stats->tx_packets = eth_stats->tx_unicast + eth_stats->tx_broadcast +
-- 
2.52.0