ionic: support ethtool rxhash disable

We can disable rxhashing by setting rss_types to 0.  The user
can toggle this with "ethtool -K <ethX> rxhash off|on",
which calls into the .ndo_set_features callback with the
NETIF_F_RXHASH feature bit set or cleared.  This patch adds
a check for that bit and updates the FW if necessary.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index d1567e4..4b953f9 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1094,6 +1094,7 @@ static int ionic_set_nic_features(struct ionic_lif *lif,
        u64 vlan_flags = IONIC_ETH_HW_VLAN_TX_TAG |
                         IONIC_ETH_HW_VLAN_RX_STRIP |
                         IONIC_ETH_HW_VLAN_RX_FILTER;
+       u64 old_hw_features;
        int err;
 
        ctx.cmd.lif_setattr.features = ionic_netdev_features_to_nic(features);
@@ -1101,9 +1102,13 @@ static int ionic_set_nic_features(struct ionic_lif *lif,
        if (err)
                return err;
 
+       old_hw_features = lif->hw_features;
        lif->hw_features = le64_to_cpu(ctx.cmd.lif_setattr.features &
                                       ctx.comp.lif_setattr.features);
 
+       if ((old_hw_features ^ lif->hw_features) & IONIC_ETH_HW_RX_HASH)
+               ionic_lif_rss_config(lif, lif->rss_types, NULL, NULL);
+
        if ((vlan_flags & features) &&
            !(vlan_flags & le64_to_cpu(ctx.comp.lif_setattr.features)))
                dev_info_once(lif->ionic->dev, "NIC is not supporting vlan offload, likely in SmartNIC mode\n");
@@ -1357,13 +1362,15 @@ int ionic_lif_rss_config(struct ionic_lif *lif, const u16 types,
                .cmd.lif_setattr = {
                        .opcode = IONIC_CMD_LIF_SETATTR,
                        .attr = IONIC_LIF_ATTR_RSS,
-                       .rss.types = cpu_to_le16(types),
                        .rss.addr = cpu_to_le64(lif->rss_ind_tbl_pa),
                },
        };
        unsigned int i, tbl_sz;
 
-       lif->rss_types = types;
+       if (lif->hw_features & IONIC_ETH_HW_RX_HASH) {
+               lif->rss_types = types;
+               ctx.cmd.lif_setattr.rss.types = cpu_to_le16(types);
+       }
 
        if (key)
                memcpy(lif->rss_hash_key, key, IONIC_RSS_HASH_KEY_SIZE);