netdev - [PATCH net-next 5/8] tg3: Fix RSS indirection table distribution

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Message-ID: <1311193257-20531-6-git-send-email-mcarlson@broadcom.com>
Date:	Wed, 20 Jul 2011 13:20:54 -0700
From:	"Matt Carlson" <mcarlson@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org, mcarlson@...adcom.com
Subject: [PATCH net-next 5/8] tg3: Fix RSS indirection table
 distribution

The current RSS indirection table is populated such that more traffic
will hit the first RSS ring.  This patch adjusts the indirection table
so that the load is more evenly distributed.

Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
Reviewed-by: Michael Chan <mchan@...adcom.com>
---
 drivers/net/tg3.c |   21 +++++++++++++++------
 1 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 5110ea0..e5c1bc9 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -8723,15 +8723,24 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
 	udelay(100);
 
 	if (tg3_flag(tp, ENABLE_RSS)) {
+		int i = 0;
 		u32 reg = MAC_RSS_INDIR_TBL_0;
-		u8 *ent = (u8 *)&val;
 
-		/* Setup the indirection table */
-		for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++) {
-			int idx = i % sizeof(val);
+		if (tp->irq_cnt == 2) {
+			for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i += 8) {
+				tw32(reg, 0x0);
+				reg += 4;
+			}
+		} else {
+			u32 val;
 
-			ent[idx] = i % (tp->irq_cnt - 1);
-			if (idx == sizeof(val) - 1) {
+			while (i < TG3_RSS_INDIR_TBL_SIZE) {
+				val = i % (tp->irq_cnt - 1);
+				i++;
+				for (; i % 8; i++) {
+					val <<= 4;
+					val |= (i % (tp->irq_cnt - 1));
+				}
 				tw32(reg, val);
 				reg += 4;
 			}
-- 
1.7.3.4


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