net: enetc: show RX drop counters only for assigned RX rings

For ENETC v1, each SI provides 16 RBDCR registers for RX ring drop
counters, but this does not imply that an SI actually owns 16 RX rings.
The ENETC hardware supports a total of 16 RX rings, which are assigned
to 3 SIs (1 PSI and 2 VSIs), so each SI is assigned fewer than 16 RX
rings.

The current implementation always reports 16 RX drop counters per SI,
leading to redundant output for SIs with fewer RX rings. Update the
logic to display drop counters only for the RX rings that are actually
assigned to the SI.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://patch.msgid.link/20260408055849.1314033-3-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index c30a119e91420d6508c2849c0940720e8bec9397..36d1a2b810c29f79ca28ab148e851d448d55b221 100644 (file)
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -124,22 +124,6 @@ static const struct {
        { ENETC_SITFRM, "SI tx frames" },
        { ENETC_SITUCA, "SI tx u-cast frames" },
        { ENETC_SITMCA, "SI tx m-cast frames" },
-       { ENETC_RBDCR(0), "Rx ring  0 discarded frames" },
-       { ENETC_RBDCR(1), "Rx ring  1 discarded frames" },
-       { ENETC_RBDCR(2), "Rx ring  2 discarded frames" },
-       { ENETC_RBDCR(3), "Rx ring  3 discarded frames" },
-       { ENETC_RBDCR(4), "Rx ring  4 discarded frames" },
-       { ENETC_RBDCR(5), "Rx ring  5 discarded frames" },
-       { ENETC_RBDCR(6), "Rx ring  6 discarded frames" },
-       { ENETC_RBDCR(7), "Rx ring  7 discarded frames" },
-       { ENETC_RBDCR(8), "Rx ring  8 discarded frames" },
-       { ENETC_RBDCR(9), "Rx ring  9 discarded frames" },
-       { ENETC_RBDCR(10), "Rx ring 10 discarded frames" },
-       { ENETC_RBDCR(11), "Rx ring 11 discarded frames" },
-       { ENETC_RBDCR(12), "Rx ring 12 discarded frames" },
-       { ENETC_RBDCR(13), "Rx ring 13 discarded frames" },
-       { ENETC_RBDCR(14), "Rx ring 14 discarded frames" },
-       { ENETC_RBDCR(15), "Rx ring 15 discarded frames" },
 };
 
 static const struct {
@@ -224,6 +208,7 @@ static const char rx_ring_stats[][ETH_GSTRING_LEN] = {
        "Rx ring %2d recycle failures",
        "Rx ring %2d redirects",
        "Rx ring %2d redirect failures",
+       "Rx ring %2d discarded frames",
 };
 
 static const char tx_ring_stats[][ETH_GSTRING_LEN] = {
@@ -308,6 +293,7 @@ static void enetc_get_ethtool_stats(struct net_device *ndev,
                data[o++] = priv->rx_ring[i]->stats.recycle_failures;
                data[o++] = priv->rx_ring[i]->stats.xdp_redirect;
                data[o++] = priv->rx_ring[i]->stats.xdp_redirect_failures;
+               data[o++] = enetc_rd(hw, ENETC_RBDCR(i));
        }
 
        if (!enetc_si_is_pf(priv->si))