From: Brice Goglin <brice@myri.com>
Date: Tue, 9 Jan 2007 20:04:25 +0000 (+0100)
Subject: myri10ge: make wc_fifo usage load-time tunable
X-Git-Tag: v2.6.20-rc6~52^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ebc087a10c3953d59a61f362bd532f2d9468d1b;p=linux-2.6

myri10ge: make wc_fifo usage load-time tunable

Under some circumstances, using WC without the WC fifo is faster.
So we make it possible to tune wc_fifo with a module parameter.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 07cf574197..b06e0eba52 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -274,6 +274,10 @@ static int myri10ge_fill_thresh = 256;
 module_param(myri10ge_fill_thresh, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(myri10ge_fill_thresh, "Number of empty rx slots allowed\n");
 
+static int myri10ge_wcfifo = 1;
+module_param(myri10ge_wcfifo, int, S_IRUGO);
+MODULE_PARM_DESC(myri10ge_wcfifo, "Enable WC Fifo when WC is enabled\n");
+
 #define MYRI10GE_FW_OFFSET 1024*1024
 #define MYRI10GE_HIGHPART_TO_U32(X) \
 (sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
@@ -1714,7 +1718,7 @@ static int myri10ge_open(struct net_device *dev)
 		goto abort_with_irq;
 	}
 
-	if (mgp->mtrr >= 0) {
+	if (myri10ge_wcfifo && mgp->mtrr >= 0) {
 		mgp->tx.wc_fifo = (u8 __iomem *) mgp->sram + MXGEFW_ETH_SEND_4;
 		mgp->rx_small.wc_fifo =
 		    (u8 __iomem *) mgp->sram + MXGEFW_ETH_RECV_SMALL;