[PATCH] myri10ge: use netif_msg_link

Add msg_enable and use netif_msg_link to enable/disable reporting
of link status changes since some Ethernet switches seem to generate
a lot of status changes under some circumstances and some people
want to avoid useless flooding in the logs.

Also add a counter for link status changes to statistics.

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

1 files changed, 39 insertions, 7 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index c0c41ca688ef..a79afe2134ba 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -192,6 +192,8 @@ struct myri10ge_priv {
         u32 read_dma;
         u32 write_dma;
         u32 read_write_dma;
+        u32 link_changes;
+        u32 msg_enable;
 };
 
 static char *myri10ge_fw_unaligned = "myri10ge_ethp_z8e.dat";
@@ -257,6 +259,12 @@ module_param(myri10ge_max_irq_loops, int, S_IRUGO);
 MODULE_PARM_DESC(myri10ge_max_irq_loops,
                  "Set stuck legacy IRQ detection threshold\n");
 
+#define MYRI10GE_MSG_DEFAULT NETIF_MSG_LINK
+
+static int myri10ge_debug = -1; /* defaults above */
+module_param(myri10ge_debug, int, 0);
+MODULE_PARM_DESC(myri10ge_debug, "Debug level (0=none,...,16=all)");
+
 #define MYRI10GE_FW_OFFSET 1024*1024
 #define MYRI10GE_HIGHPART_TO_U32(X) \
 (sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
@@ -764,6 +772,7 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
         mgp->rx_small.cnt = 0;
         mgp->rx_done.idx = 0;
         mgp->rx_done.cnt = 0;
+        mgp->link_changes = 0;
         status = myri10ge_update_mac_address(mgp, mgp->dev->dev_addr);
         myri10ge_change_promisc(mgp, 0, 0);
         myri10ge_change_pause(mgp, mgp->pause);
@@ -1085,13 +1094,19 @@ static inline void myri10ge_check_statblock(struct myri10ge_priv *mgp)
                 if (mgp->link_state != stats->link_up) {
                         mgp->link_state = stats->link_up;
                         if (mgp->link_state) {
-                                printk(KERN_INFO "myri10ge: %s: link up\n",
-                                       mgp->dev->name);
+                                if (netif_msg_link(mgp))
+                                        printk(KERN_INFO
+                                               "myri10ge: %s: link up\n",
+                                               mgp->dev->name);
                                 netif_carrier_on(mgp->dev);
+                                mgp->link_changes++;
                         } else {
-                                printk(KERN_INFO "myri10ge: %s: link down\n",
-                                       mgp->dev->name);
+                                if (netif_msg_link(mgp))
+                                        printk(KERN_INFO
+                                               "myri10ge: %s: link down\n",
+                                               mgp->dev->name);
                                 netif_carrier_off(mgp->dev);
+                                mgp->link_changes++;
                         }
                 }
                 if (mgp->rdma_tags_available !=
@@ -1293,8 +1308,9 @@ static const char myri10ge_gstrings_stats[][ETH_GSTRING_LEN] = {
         "serial_number", "tx_pkt_start", "tx_pkt_done",
         "tx_req", "tx_done", "rx_small_cnt", "rx_big_cnt",
         "wake_queue", "stop_queue", "watchdog_resets", "tx_linearized",
-        "link_up", "dropped_link_overflow", "dropped_link_error_or_filtered",
-        "dropped_runt", "dropped_overrun", "dropped_no_small_buffer",
+        "link_changes", "link_up", "dropped_link_overflow",
+        "dropped_link_error_or_filtered", "dropped_runt",
+        "dropped_overrun", "dropped_no_small_buffer",
         "dropped_no_big_buffer"
 };
 
@@ -1345,6 +1361,7 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
         data[i++] = (unsigned int)mgp->stop_queue;
         data[i++] = (unsigned int)mgp->watchdog_resets;
         data[i++] = (unsigned int)mgp->tx_linearized;
+        data[i++] = (unsigned int)mgp->link_changes;
         data[i++] = (unsigned int)ntohl(mgp->fw_stats->link_up);
         data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_link_overflow);
         data[i++] =
@@ -1355,6 +1372,18 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
         data[i++] = (unsigned int)ntohl(mgp->fw_stats->dropped_no_big_buffer);
 }
 
+static void myri10ge_set_msglevel(struct net_device *netdev, u32 value)
+{
+        struct myri10ge_priv *mgp = netdev_priv(netdev);
+        mgp->msg_enable = value;
+}
+
+static u32 myri10ge_get_msglevel(struct net_device *netdev)
+{
+        struct myri10ge_priv *mgp = netdev_priv(netdev);
+        return mgp->msg_enable;
+}
+
 static struct ethtool_ops myri10ge_ethtool_ops = {
         .get_settings = myri10ge_get_settings,
         .get_drvinfo = myri10ge_get_drvinfo,
@@ -1375,7 +1404,9 @@ static struct ethtool_ops myri10ge_ethtool_ops = {
 #endif
         .get_strings = myri10ge_get_strings,
         .get_stats_count = myri10ge_get_stats_count,
-        .get_ethtool_stats = myri10ge_get_ethtool_stats
+        .get_ethtool_stats = myri10ge_get_ethtool_stats,
+        .set_msglevel = myri10ge_set_msglevel,
+        .get_msglevel = myri10ge_get_msglevel
 };
 
 static int myri10ge_allocate_rings(struct net_device *dev)
@@ -2587,6 +2618,7 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
         mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
         mgp->pause = myri10ge_flow_control;
         mgp->intr_coal_delay = myri10ge_intr_coal_delay;
+        mgp->msg_enable = netif_msg_init(myri10ge_debug, MYRI10GE_MSG_DEFAULT);
         init_waitqueue_head(&mgp->down_wq);
 
         if (pci_enable_device(pdev)) {