gianfar: Change default HW Tx queue scheduling mode

This is primarily to address transmission timeout occurrences, when
multiple H/W Tx queues are being used concurrently. Because in
the priority scheduling mode the controller does not service the
Tx queues equally (but in ascending index order), Tx timeouts are
being triggered rightaway for a basic test with multiple simultaneous
connections like:
iperf -c <server_ip> -n 100M -P 8

resulting in kernel trace:
NETDEV WATCHDOG: eth1 (fsl-gianfar): transmit queue <X> timed out
------------[ cut here ]------------
WARNING: at net/sched/sch_generic.c:255
...
and controller reset during intense traffic, and possibly further
complications.

This patch changes the default H/W Tx scheduling setting (TXSCHED)
for multi-queue devices, from priority scheduling mode to a weighted
round robin mode with equal weights for all H/W Tx queues, and
addresses the issue above.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 20 insertions, 2 deletions

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 4d5b58ce129..a1b52ec3b93 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -394,7 +394,13 @@ static void gfar_init_mac(struct net_device *ndev)
         if (ndev->features & NETIF_F_IP_CSUM)
                 tctrl |= TCTRL_INIT_CSUM;
 
-        tctrl |= TCTRL_TXSCHED_PRIO;
+        if (priv->prio_sched_en)
+                tctrl |= TCTRL_TXSCHED_PRIO;
+        else {
+                tctrl |= TCTRL_TXSCHED_WRRS;
+                gfar_write(&regs->tr03wt, DEFAULT_WRRS_WEIGHT);
+                gfar_write(&regs->tr47wt, DEFAULT_WRRS_WEIGHT);
+        }
 
         gfar_write(&regs->tctrl, tctrl);
 
@@ -1160,6 +1166,9 @@ static int gfar_probe(struct platform_device *ofdev)
         priv->rx_filer_enable = 1;
         /* Enable most messages by default */
         priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
+        /* use pritority h/w tx queue scheduling for single queue devices */
+        if (priv->num_tx_queues == 1)
+                priv->prio_sched_en = 1;
 
         /* Carrier starts down, phylib will bring it up */
         netif_carrier_off(dev);
diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 2136c7ff5e6..4141ef2ddaf 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -301,8 +301,16 @@ extern const char gfar_driver_version[];
 #define TCTRL_TFCPAUSE          0x00000008
 #define TCTRL_TXSCHED_MASK      0x00000006
 #define TCTRL_TXSCHED_INIT      0x00000000
+/* priority scheduling */
 #define TCTRL_TXSCHED_PRIO      0x00000002
+/* weighted round-robin scheduling (WRRS) */
 #define TCTRL_TXSCHED_WRRS      0x00000004
+/* default WRRS weight and policy setting,
+ * tailored to the tr03wt and tr47wt registers:
+ * equal weight for all Tx Qs, measured in 64byte units
+ */
+#define DEFAULT_WRRS_WEIGHT     0x18181818
+
 #define TCTRL_INIT_CSUM         (TCTRL_TUCSEN | TCTRL_IPCSEN)
 
 #define IEVENT_INIT_CLEAR       0xffffffff
@@ -1098,7 +1106,8 @@ struct gfar_private {
                 extended_hash:1,
                 bd_stash_en:1,
                 rx_filer_enable:1,
-                wol_en:1; /* Wake-on-LAN enabled */
+                wol_en:1, /* Wake-on-LAN enabled */
+                prio_sched_en:1; /* Enable priorty based Tx scheduling in Hw */
         unsigned short padding;
 
         /* PHY stuff */