i40e: use netdev_rss_key_fill() helper

Use of well known RSS key increases attack surface.
Switch to a random one, using generic helper so that all
ports share a common key.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -7002,20 +7002,16 @@ static int i40e_setup_misc_vector(struct i40e_pf *pf)
  **/
 static int i40e_config_rss(struct i40e_pf *pf)
 {
-	/* Set of random keys generated using kernel random number generator */
-	static const u32 seed[I40E_PFQF_HKEY_MAX_INDEX + 1] = {0x41b01687,
-				0x183cfd8c, 0xce880440, 0x580cbc3c, 0x35897377,
-				0x328b25e1, 0x4fa98922, 0xb7d90c14, 0xd5bad70d,
-				0xcd15a2c1, 0xe8580225, 0x4a1e9d11, 0xfe5731be};
+	u32 rss_key[I40E_PFQF_HKEY_MAX_INDEX + 1];
 	struct i40e_hw *hw = &pf->hw;
 	u32 lut = 0;
 	int i, j;
 	u64 hena;
 	u32 reg_val;
 
-	/* Fill out hash function seed */
+	netdev_rss_key_fill(rss_key, sizeof(rss_key));
 	for (i = 0; i <= I40E_PFQF_HKEY_MAX_INDEX; i++)
-		wr32(hw, I40E_PFQF_HKEY(i), seed[i]);
+		wr32(hw, I40E_PFQF_HKEY(i), rss_key[i]);
 
 	/* By default we enable TCP/UDP with IPv4/IPv6 ptypes */
 	hena = (u64)rd32(hw, I40E_PFQF_HENA(0)) |

drivers/net/ethernet/intel/i40evf/i40evf_main.c

@@ -1434,18 +1434,12 @@ static int next_queue(struct i40evf_adapter *adapter, int j)
  **/
 static void i40evf_configure_rss(struct i40evf_adapter *adapter)
 {
+	u32 rss_key[I40E_VFQF_HKEY_MAX_INDEX + 1];
 	struct i40e_hw *hw = &adapter->hw;
 	u32 lut = 0;
 	int i, j;
 	u64 hena;
 
-	/* Set of random keys generated using kernel random number generator */
-	static const u32 seed[I40E_VFQF_HKEY_MAX_INDEX + 1] = {
-			0x794221b4, 0xbca0c5ab, 0x6cd5ebd9, 0x1ada6127,
-			0x983b3aa1, 0x1c4e71eb, 0x7f6328b2, 0xfcdc0da0,
-			0xc135cafa, 0x7a6f7e2d, 0xe7102d28, 0x163cd12e,
-			0x4954b126 };
-
 	/* No RSS for single queue. */
 	if (adapter->num_active_queues == 1) {
 		wr32(hw, I40E_VFQF_HENA(0), 0);
@@ -1454,8 +1448,9 @@ static void i40evf_configure_rss(struct i40evf_adapter *adapter)
 	}
 
 	/* Hash type is configured by the PF - we just supply the key */
+	netdev_rss_key_fill(rss_key, sizeof(rss_key));
 	for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
-		wr32(hw, I40E_VFQF_HKEY(i), seed[i]);
+		wr32(hw, I40E_VFQF_HKEY(i), rss_key[i]);
 
 	/* Enable PCTYPES for RSS, TCP/UDP with IPv4/IPv6 */
 	hena = I40E_DEFAULT_RSS_HENA;