[TG3]: support for ethtool -C

Add support for ethtool -C with verification of user parameters.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -5117,7 +5117,7 @@ static void tg3_set_bdinfo(struct tg3 *tp, u32 bdinfo_addr,
 }
 
 static void __tg3_set_rx_mode(struct net_device *);
-static void tg3_set_coalesce(struct tg3 *tp, struct ethtool_coalesce *ec)
+static void __tg3_set_coalesce(struct tg3 *tp, struct ethtool_coalesce *ec)
 {
 	tw32(HOSTCC_RXCOL_TICKS, ec->rx_coalesce_usecs);
 	tw32(HOSTCC_TXCOL_TICKS, ec->tx_coalesce_usecs);
@@ -5460,7 +5460,7 @@ static int tg3_reset_hw(struct tg3 *tp)
 		udelay(10);
 	}
 
-	tg3_set_coalesce(tp, &tp->coal);
+	__tg3_set_coalesce(tp, &tp->coal);
 
 	/* set status block DMA address */
 	tw32(HOSTCC_STATUS_BLK_HOST_ADDR + TG3_64BIT_REG_HIGH,
@@ -7821,6 +7821,60 @@ static int tg3_get_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
 	return 0;
 }
 
+static int tg3_set_coalesce(struct net_device *dev, struct ethtool_coalesce *ec)
+{
+	struct tg3 *tp = netdev_priv(dev);
+	u32 max_rxcoal_tick_int = 0, max_txcoal_tick_int = 0;
+	u32 max_stat_coal_ticks = 0, min_stat_coal_ticks = 0;
+
+	if (!(tp->tg3_flags2 & TG3_FLG2_5705_PLUS)) {
+		max_rxcoal_tick_int = MAX_RXCOAL_TICK_INT;
+		max_txcoal_tick_int = MAX_TXCOAL_TICK_INT;
+		max_stat_coal_ticks = MAX_STAT_COAL_TICKS;
+		min_stat_coal_ticks = MIN_STAT_COAL_TICKS;
+	}
+
+	if ((ec->rx_coalesce_usecs > MAX_RXCOL_TICKS) ||
+	    (ec->tx_coalesce_usecs > MAX_TXCOL_TICKS) ||
+	    (ec->rx_max_coalesced_frames > MAX_RXMAX_FRAMES) ||
+	    (ec->tx_max_coalesced_frames > MAX_TXMAX_FRAMES) ||
+	    (ec->rx_coalesce_usecs_irq > max_rxcoal_tick_int) ||
+	    (ec->tx_coalesce_usecs_irq > max_txcoal_tick_int) ||
+	    (ec->rx_max_coalesced_frames_irq > MAX_RXCOAL_MAXF_INT) ||
+	    (ec->tx_max_coalesced_frames_irq > MAX_TXCOAL_MAXF_INT) ||
+	    (ec->stats_block_coalesce_usecs > max_stat_coal_ticks) ||
+	    (ec->stats_block_coalesce_usecs < min_stat_coal_ticks))
+		return -EINVAL;
+
+	/* No rx interrupts will be generated if both are zero */
+	if ((ec->rx_coalesce_usecs == 0) &&
+	    (ec->rx_max_coalesced_frames == 0))
+		return -EINVAL;
+
+	/* No tx interrupts will be generated if both are zero */
+	if ((ec->tx_coalesce_usecs == 0) &&
+	    (ec->tx_max_coalesced_frames == 0))
+		return -EINVAL;
+
+	/* Only copy relevant parameters, ignore all others. */
+	tp->coal.rx_coalesce_usecs = ec->rx_coalesce_usecs;
+	tp->coal.tx_coalesce_usecs = ec->tx_coalesce_usecs;
+	tp->coal.rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
+	tp->coal.tx_max_coalesced_frames = ec->tx_max_coalesced_frames;
+	tp->coal.rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq;
+	tp->coal.tx_coalesce_usecs_irq = ec->tx_coalesce_usecs_irq;
+	tp->coal.rx_max_coalesced_frames_irq = ec->rx_max_coalesced_frames_irq;
+	tp->coal.tx_max_coalesced_frames_irq = ec->tx_max_coalesced_frames_irq;
+	tp->coal.stats_block_coalesce_usecs = ec->stats_block_coalesce_usecs;
+
+	if (netif_running(dev)) {
+		tg3_full_lock(tp, 0);
+		__tg3_set_coalesce(tp, &tp->coal);
+		tg3_full_unlock(tp);
+	}
+	return 0;
+}
+
 static struct ethtool_ops tg3_ethtool_ops = {
 	.get_settings		= tg3_get_settings,
 	.set_settings		= tg3_set_settings,
@@ -7856,6 +7910,7 @@ static struct ethtool_ops tg3_ethtool_ops = {
 	.get_stats_count	= tg3_get_stats_count,
 	.get_ethtool_stats	= tg3_get_ethtool_stats,
 	.get_coalesce		= tg3_get_coalesce,
+	.set_coalesce		= tg3_set_coalesce,
 };
 
 static void __devinit tg3_get_eeprom_size(struct tg3 *tp)
@@ -9800,6 +9855,12 @@ static void __devinit tg3_init_coal(struct tg3 *tp)
 		ec->tx_coalesce_usecs = LOW_TXCOL_TICKS_CLRTCKS;
 		ec->tx_coalesce_usecs_irq = DEFAULT_TXCOAL_TICK_INT_CLRTCKS;
 	}
+
+	if (tp->tg3_flags2 & TG3_FLG2_5705_PLUS) {
+		ec->rx_coalesce_usecs_irq = 0;
+		ec->tx_coalesce_usecs_irq = 0;
+		ec->stats_block_coalesce_usecs = 0;
+	}
 }
 
 static int __devinit tg3_init_one(struct pci_dev *pdev,

drivers/net/tg3.h

@@ -879,31 +879,41 @@
 #define  LOW_RXCOL_TICKS_CLRTCKS	 0x00000014
 #define  DEFAULT_RXCOL_TICKS		 0x00000048
 #define  HIGH_RXCOL_TICKS		 0x00000096
+#define  MAX_RXCOL_TICKS		 0x000003ff
 #define HOSTCC_TXCOL_TICKS		0x00003c0c
 #define  LOW_TXCOL_TICKS		 0x00000096
 #define  LOW_TXCOL_TICKS_CLRTCKS	 0x00000048
 #define  DEFAULT_TXCOL_TICKS		 0x0000012c
 #define  HIGH_TXCOL_TICKS		 0x00000145
+#define  MAX_TXCOL_TICKS		 0x000003ff
 #define HOSTCC_RXMAX_FRAMES		0x00003c10
 #define  LOW_RXMAX_FRAMES		 0x00000005
 #define  DEFAULT_RXMAX_FRAMES		 0x00000008
 #define  HIGH_RXMAX_FRAMES		 0x00000012
+#define  MAX_RXMAX_FRAMES		 0x000000ff
 #define HOSTCC_TXMAX_FRAMES		0x00003c14
 #define  LOW_TXMAX_FRAMES		 0x00000035
 #define  DEFAULT_TXMAX_FRAMES		 0x0000004b
 #define  HIGH_TXMAX_FRAMES		 0x00000052
+#define  MAX_TXMAX_FRAMES		 0x000000ff
 #define HOSTCC_RXCOAL_TICK_INT		0x00003c18
 #define  DEFAULT_RXCOAL_TICK_INT	 0x00000019
 #define  DEFAULT_RXCOAL_TICK_INT_CLRTCKS 0x00000014
+#define  MAX_RXCOAL_TICK_INT		 0x000003ff
 #define HOSTCC_TXCOAL_TICK_INT		0x00003c1c
 #define  DEFAULT_TXCOAL_TICK_INT	 0x00000019
 #define  DEFAULT_TXCOAL_TICK_INT_CLRTCKS 0x00000014
+#define  MAX_TXCOAL_TICK_INT		 0x000003ff
 #define HOSTCC_RXCOAL_MAXF_INT		0x00003c20
 #define  DEFAULT_RXCOAL_MAXF_INT	 0x00000005
+#define  MAX_RXCOAL_MAXF_INT		 0x000000ff
 #define HOSTCC_TXCOAL_MAXF_INT		0x00003c24
 #define  DEFAULT_TXCOAL_MAXF_INT	 0x00000005
+#define  MAX_TXCOAL_MAXF_INT		 0x000000ff
 #define HOSTCC_STAT_COAL_TICKS		0x00003c28
 #define  DEFAULT_STAT_COAL_TICKS	 0x000f4240
+#define  MAX_STAT_COAL_TICKS		 0xd693d400
+#define  MIN_STAT_COAL_TICKS		 0x00000064
 /* 0x3c2c --> 0x3c30 unused */
 #define HOSTCC_STATS_BLK_HOST_ADDR	0x00003c30 /* 64-bit */
 #define HOSTCC_STATUS_BLK_HOST_ADDR	0x00003c38 /* 64-bit */