sfc: don't report RX hash keys to ethtool when RSS wasn't enabled

If we failed to set up RSS on EF10 (e.g. because firmware declared
 RX_RSS_LIMITED), ethtool --show-nfc $dev rx-flow-hash ... should report
 no fields, rather than confusingly reporting what fields we _would_ be
 hashing on if RSS was working.

Fixes: dcb4123cbec0 ("sfc: disable RSS when unsupported")
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index de2947c..5eb0e68 100644 (file)
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -1323,7 +1323,8 @@ static int efx_ef10_init_nic(struct efx_nic *efx)
        }
 
        /* don't fail init if RSS setup doesn't work */
-       efx->type->rx_push_rss_config(efx, false, efx->rx_indir_table);
+       rc = efx->type->rx_push_rss_config(efx, false, efx->rx_indir_table);
+       efx->rss_active = (rc == 0);
 
        return 0;
 }

diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c
index 87bdc56..18ebaea 100644 (file)
--- a/drivers/net/ethernet/sfc/ethtool.c
+++ b/drivers/net/ethernet/sfc/ethtool.c
@@ -975,6 +975,8 @@ efx_ethtool_get_rxnfc(struct net_device *net_dev,
 
        case ETHTOOL_GRXFH: {
                info->data = 0;
+               if (!efx->rss_active) /* No RSS */
+                       return 0;
                switch (info->flow_type) {
                case UDP_V4_FLOW:
                        if (efx->rx_hash_udp_4tuple)

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 1a635ce..1c62c1a 100644 (file)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -860,6 +860,7 @@ struct vfdi_status;
  * @rx_hash_key: Toeplitz hash key for RSS
  * @rx_indir_table: Indirection table for RSS
  * @rx_scatter: Scatter mode enabled for receives
+ * @rss_active: RSS enabled on hardware
  * @rx_hash_udp_4tuple: UDP 4-tuple hashing enabled
  * @int_error_count: Number of internal errors seen recently
  * @int_error_expire: Time at which error count will be expired
@@ -998,6 +999,7 @@ struct efx_nic {
        u8 rx_hash_key[40];
        u32 rx_indir_table[128];
        bool rx_scatter;
+       bool rss_active;
        bool rx_hash_udp_4tuple;
 
        unsigned int_error_count;

diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index a3901bc..4e54e5d 100644 (file)
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -403,6 +403,7 @@ static int siena_init_nic(struct efx_nic *efx)
        efx_writeo(efx, &temp, FR_AZ_RX_CFG);
 
        siena_rx_push_rss_config(efx, false, efx->rx_indir_table);
+       efx->rss_active = true;
 
        /* Enable event logging */
        rc = efx_mcdi_log_ctrl(efx, true, false, 0);