diff mbox

[5/6] sky2: used fixed RSS key

Message ID 20111116234344.909500366@vyatta.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

stephen hemminger Nov. 16, 2011, 11:42 p.m. UTC 
Rather than generating a different RSS key on each boot, just use
a predetermined value that will map same flow to same value on
every device.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>




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diff mbox

Patch

--- a/drivers/net/ethernet/marvell/sky2.c	2011-11-16 15:19:40.990692544 -0800
+++ b/drivers/net/ethernet/marvell/sky2.c	2011-11-16 15:19:42.254721076 -0800
@@ -1275,6 +1275,14 @@  static void rx_set_checksum(struct sky2_
 		     ? BMU_ENA_RX_CHKSUM : BMU_DIS_RX_CHKSUM);
 }
 
+/*
+ * Fixed initial key as seed to RSS.
+ */
+static const uint32_t rss_init_key[10] = {
+	0x7c3351da, 0x51c5cf4e,	0x44adbdd1, 0xe8d38d18,	0x48897c43,
+	0xb1d60e7e, 0x6a3dd760, 0x01a2e453, 0x16f46f13, 0x1a0e7b30
+};
+
 /* Enable/disable receive hash calculation (RSS) */
 static void rx_set_rss(struct net_device *dev, netdev_features_t features)
 {
@@ -1290,12 +1298,9 @@  static void rx_set_rss(struct net_device
 
 	/* Program RSS initial values */
 	if (features & NETIF_F_RXHASH) {
-		u32 key[nkeys];
-
-		get_random_bytes(key, nkeys * sizeof(u32));
 		for (i = 0; i < nkeys; i++)
 			sky2_write32(hw, SK_REG(sky2->port, RSS_KEY + i * 4),
-				     key[i]);
+				     rss_init_key[i]);
 
 		/* Need to turn on (undocumented) flag to make hashing work  */
 		sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T),