From: Edward Cree <ecree@solarflare.com>
Date: Wed, 4 Jan 2017 15:10:56 +0000 (+0000)
Subject: sfc: don't report RX hash keys to ethtool when RSS wasn't enabled
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4fdda95893de776a8efdf661bbf0e338f2f13dcb;p=linux-beck.git

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 de2947ccc5ad..5eb0e684fd76 100644
--- 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 87bdc56b4e3a..18ebaea44e82 100644
--- 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 1a635ced62d0..1c62c1a00fca 100644
--- 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 a3901bc96586..4e54e5dc9fcb 100644
--- 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);