forcedeth: add tx pause limit

This patch adds support for limiting the number of tx pause frames to a
default of 8. Previously, hardware would send out continuous stream of
pause frames.

Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index d9495d2..053971e 100644 (file)
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -249,6 +249,8 @@ enum {
 #define NVREG_TX_PAUSEFRAME_ENABLE_V1  0x01800010
 #define NVREG_TX_PAUSEFRAME_ENABLE_V2  0x056003f0
 #define NVREG_TX_PAUSEFRAME_ENABLE_V3  0x09f00880
+       NvRegTxPauseFrameLimit = 0x174,
+#define NVREG_TX_PAUSEFRAMELIMIT_ENABLE        0x00010000
        NvRegMIIStatus = 0x180,
 #define NVREG_MIISTAT_ERROR            0x0001
 #define NVREG_MIISTAT_LINKCHANGE       0x0008
@@ -3076,8 +3078,11 @@ static void nv_update_pause(struct net_device *dev, u32 pause_flags)
                        u32 pause_enable = NVREG_TX_PAUSEFRAME_ENABLE_V1;
                        if (np->driver_data & DEV_HAS_PAUSEFRAME_TX_V2)
                                pause_enable = NVREG_TX_PAUSEFRAME_ENABLE_V2;
-                       if (np->driver_data & DEV_HAS_PAUSEFRAME_TX_V3)
+                       if (np->driver_data & DEV_HAS_PAUSEFRAME_TX_V3) {
                                pause_enable = NVREG_TX_PAUSEFRAME_ENABLE_V3;
+                               /* limit the number of tx pause frames to a default of 8 */
+                               writel(readl(base + NvRegTxPauseFrameLimit)|NVREG_TX_PAUSEFRAMELIMIT_ENABLE, base + NvRegTxPauseFrameLimit);
+                       }
                        writel(pause_enable,  base + NvRegTxPauseFrame);
                        writel(regmisc|NVREG_MISC1_PAUSE_TX, base + NvRegMisc1);
                        np->pause_flags |= NV_PAUSEFRAME_TX_ENABLE;