net/ncsi: Improve general state logging

The NCSI driver is mostly silent which becomes a headache when trying to
determine what has occurred on the NCSI connection. This adds additional
logging in a few key areas such as state transitions and calling out
certain errors more visibly.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 80 insertions, 21 deletions

diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c
index f135938bf781..67e708e98ccf 100644
--- a/net/ncsi/ncsi-aen.c
+++ b/net/ncsi/ncsi-aen.c
@@ -73,6 +73,9 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
 	ncm->data[2] = data;
 	ncm->data[4] = ntohl(lsc->oem_status);
 
+	netdev_info(ndp->ndev.dev, "NCSI: LSC AEN - channel %u state %s\n",
+		    nc->id, data & 0x1 ? "up" : "down");
+
 	chained = !list_empty(&nc->link);
 	state = nc->state;
 	spin_unlock_irqrestore(&nc->lock, flags);
@@ -145,6 +148,8 @@ static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp,
 	ncm = &nc->modes[NCSI_MODE_LINK];
 	hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;
 	ncm->data[3] = ntohl(hncdsc->status);
+	netdev_info(ndp->ndev.dev, "NCSI: HNCDSC AEN - channel %u state %s\n",
+		    nc->id, ncm->data[3] & 0x3 ? "up" : "down");
 	if (!list_empty(&nc->link) ||
 	    nc->state != NCSI_CHANNEL_ACTIVE) {
 		spin_unlock_irqrestore(&nc->lock, flags);
@@ -212,10 +217,18 @@ int ncsi_aen_handler(struct ncsi_dev_priv *ndp, struct sk_buff *skb)
 	}
 
 	ret = ncsi_validate_aen_pkt(h, nah->payload);
-	if (ret)
+	if (ret) {
+		netdev_warn(ndp->ndev.dev,
+			    "NCSI: 'bad' packet ignored for AEN type 0x%x\n",
+			    h->type);
 		goto out;
+	}
 
 	ret = nah->handler(ndp, h);
+	if (ret)
+		netdev_err(ndp->ndev.dev,
+			   "NCSI: Handler for AEN type 0x%x returned %d\n",
+			   h->type, ret);
 out:
 	consume_skb(skb);
 	return ret;
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 47baf914eec2..a2b904a718c6 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -229,6 +229,8 @@ static void ncsi_channel_monitor(unsigned long data)
 	case NCSI_CHANNEL_MONITOR_WAIT ... NCSI_CHANNEL_MONITOR_WAIT_MAX:
 		break;
 	default:
+		netdev_err(ndp->ndev.dev, "NCSI Channel %d timed out!\n",
+			   nc->id);
 		if (!(ndp->flags & NCSI_DEV_HWA)) {
 			ncsi_report_link(ndp, true);
 			ndp->flags |= NCSI_DEV_RESHUFFLE;
@@ -682,7 +684,7 @@ static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
 	data = ncsi_get_filter(nc, NCSI_FILTER_VLAN, index);
 	if (!data) {
 		netdev_err(ndp->ndev.dev,
-			   "ncsi: failed to retrieve filter %d\n", index);
+			   "NCSI: failed to retrieve filter %d\n", index);
 		/* Set the VLAN id to 0 - this will still disable the entry in
 		 * the filter table, but we won't know what it was.
 		 */
@@ -692,7 +694,7 @@ static int clear_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
 	}
 
 	netdev_printk(KERN_DEBUG, ndp->ndev.dev,
-		      "ncsi: removed vlan tag %u at index %d\n",
+		      "NCSI: removed vlan tag %u at index %d\n",
 		      vid, index + 1);
 	ncsi_remove_filter(nc, NCSI_FILTER_VLAN, index);
 
@@ -718,7 +720,7 @@ static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
 		if (index < 0) {
 			/* New tag to add */
 			netdev_printk(KERN_DEBUG, ndp->ndev.dev,
-				      "ncsi: new vlan id to set: %u\n",
+				      "NCSI: new vlan id to set: %u\n",
 				      vlan->vid);
 			break;
 		}
@@ -745,7 +747,7 @@ static int set_one_vid(struct ncsi_dev_priv *ndp, struct ncsi_channel *nc,
 	}
 
 	netdev_printk(KERN_DEBUG, ndp->ndev.dev,
-		      "ncsi: set vid %u in packet, index %u\n",
+		      "NCSI: set vid %u in packet, index %u\n",
 		      vlan->vid, index + 1);
 	nca->type = NCSI_PKT_CMD_SVF;
 	nca->words[1] = vlan->vid;
@@ -784,8 +786,11 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
 		nca.package = np->id;
 		nca.channel = NCSI_RESERVED_CHANNEL;
 		ret = ncsi_xmit_cmd(&nca);
-		if (ret)
+		if (ret) {
+			netdev_err(ndp->ndev.dev,
+				   "NCSI: Failed to transmit CMD_SP\n");
 			goto error;
+		}
 
 		nd->state = ncsi_dev_state_config_cis;
 		break;
@@ -797,8 +802,11 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
 		nca.package = np->id;
 		nca.channel = nc->id;
 		ret = ncsi_xmit_cmd(&nca);
-		if (ret)
+		if (ret) {
+			netdev_err(ndp->ndev.dev,
+				   "NCSI: Failed to transmit CMD_CIS\n");
 			goto error;
+		}
 
 		nd->state = ncsi_dev_state_config_clear_vids;
 		break;
@@ -895,10 +903,16 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
 		}
 
 		ret = ncsi_xmit_cmd(&nca);
-		if (ret)
+		if (ret) {
+			netdev_err(ndp->ndev.dev,
+				   "NCSI: Failed to transmit CMD %x\n",
+				   nca.type);
 			goto error;
+		}
 		break;
 	case ncsi_dev_state_config_done:
+		netdev_printk(KERN_DEBUG, ndp->ndev.dev,
+			      "NCSI: channel %u config done\n", nc->id);
 		spin_lock_irqsave(&nc->lock, flags);
 		if (nc->reconfigure_needed) {
 			/* This channel's configuration has been updated
@@ -925,6 +939,9 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
 		} else {
 			hot_nc = NULL;
 			nc->state = NCSI_CHANNEL_INACTIVE;
+			netdev_warn(ndp->ndev.dev,
+				    "NCSI: channel %u link down after config\n",
+				    nc->id);
 		}
 		spin_unlock_irqrestore(&nc->lock, flags);
 
@@ -937,8 +954,8 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
 		ncsi_process_next_channel(ndp);
 		break;
 	default:
-		netdev_warn(dev, "Wrong NCSI state 0x%x in config\n",
-			    nd->state);
+		netdev_alert(dev, "Wrong NCSI state 0x%x in config\n",
+			     nd->state);
 	}
 
 	return;
@@ -990,10 +1007,17 @@ static int ncsi_choose_active_channel(struct ncsi_dev_priv *ndp)
 	}
 
 	if (!found) {
+		netdev_warn(ndp->ndev.dev,
+			    "NCSI: No channel found with link\n");
 		ncsi_report_link(ndp, true);
 		return -ENODEV;
 	}
 
+	ncm = &found->modes[NCSI_MODE_LINK];
+	netdev_printk(KERN_DEBUG, ndp->ndev.dev,
+		      "NCSI: Channel %u added to queue (link %s)\n",
+		      found->id, ncm->data[2] & 0x1 ? "up" : "down");
+
 out:
 	spin_lock_irqsave(&ndp->lock, flags);
 	list_add_tail_rcu(&found->link, &ndp->channel_queue);
@@ -1055,6 +1079,8 @@ static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
 
 	/* We can have no channels in extremely case */
 	if (list_empty(&ndp->channel_queue)) {
+		netdev_err(ndp->ndev.dev,
+			   "NCSI: No available channels for HWA\n");
 		ncsi_report_link(ndp, false);
 		return -ENOENT;
 	}
@@ -1223,6 +1249,9 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
 
 	return;
 error:
+	netdev_err(ndp->ndev.dev,
+		   "NCSI: Failed to transmit cmd 0x%x during probe\n",
+		   nca.type);
 	ncsi_report_link(ndp, true);
 }
 
@@ -1276,10 +1305,14 @@ int ncsi_process_next_channel(struct ncsi_dev_priv *ndp)
 	switch (old_state) {
 	case NCSI_CHANNEL_INACTIVE:
 		ndp->ndev.state = ncsi_dev_state_config;
+		netdev_info(ndp->ndev.dev, "NCSI: configuring channel %u\n",
+			    nc->id);
 		ncsi_configure_channel(ndp);
 		break;
 	case NCSI_CHANNEL_ACTIVE:
 		ndp->ndev.state = ncsi_dev_state_suspend;
+		netdev_info(ndp->ndev.dev, "NCSI: suspending channel %u\n",
+			    nc->id);
 		ncsi_suspend_channel(ndp);
 		break;
 	default:
@@ -1299,6 +1332,8 @@ out:
 		return ncsi_choose_active_channel(ndp);
 	}
 
+	netdev_printk(KERN_DEBUG, ndp->ndev.dev,
+		      "NCSI: No more channels to process\n");
 	ncsi_report_link(ndp, false);
 	return -ENODEV;
 }
@@ -1390,7 +1425,7 @@ static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
 						ncsi_dev_state_config ||
 						!list_empty(&nc->link)) {
 					netdev_printk(KERN_DEBUG, nd->dev,
-						      "ncsi: channel %p marked dirty\n",
+						      "NCSI: channel %p marked dirty\n",
 						      nc);
 					nc->reconfigure_needed = true;
 				}
@@ -1410,7 +1445,7 @@ static int ncsi_kick_channels(struct ncsi_dev_priv *ndp)
 			spin_unlock_irqrestore(&ndp->lock, flags);
 
 			netdev_printk(KERN_DEBUG, nd->dev,
-				      "ncsi: kicked channel %p\n", nc);
+				      "NCSI: kicked channel %p\n", nc);
 			n++;
 		}
 	}
@@ -1431,7 +1466,7 @@ int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 
 	nd = ncsi_find_dev(dev);
 	if (!nd) {
-		netdev_warn(dev, "ncsi: No net_device?\n");
+		netdev_warn(dev, "NCSI: No net_device?\n");
 		return 0;
 	}
 
@@ -1442,7 +1477,7 @@ int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 		n_vids++;
 		if (vlan->vid == vid) {
 			netdev_printk(KERN_DEBUG, dev,
-				      "vid %u already registered\n", vid);
+				      "NCSI: vid %u already registered\n", vid);
 			return 0;
 		}
 	}
@@ -1461,7 +1496,7 @@ int ncsi_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid)
 	vlan->vid = vid;
 	list_add_rcu(&vlan->list, &ndp->vlan_vids);
 
-	netdev_printk(KERN_DEBUG, dev, "Added new vid %u\n", vid);
+	netdev_printk(KERN_DEBUG, dev, "NCSI: Added new vid %u\n", vid);
 
 	found = ncsi_kick_channels(ndp) != 0;
 
@@ -1481,7 +1516,7 @@ int ncsi_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
 
 	nd = ncsi_find_dev(dev);
 	if (!nd) {
-		netdev_warn(dev, "ncsi: no net_device?\n");
+		netdev_warn(dev, "NCSI: no net_device?\n");
 		return 0;
 	}
 
@@ -1491,14 +1526,14 @@ int ncsi_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
 	list_for_each_entry_safe(vlan, tmp, &ndp->vlan_vids, list)
 		if (vlan->vid == vid) {
 			netdev_printk(KERN_DEBUG, dev,
-				      "vid %u found, removing\n", vid);
+				      "NCSI: vid %u found, removing\n", vid);
 			list_del_rcu(&vlan->list);
 			found = true;
 			kfree(vlan);
 		}
 
 	if (!found) {
-		netdev_err(dev, "ncsi: vid %u wasn't registered!\n", vid);
+		netdev_err(dev, "NCSI: vid %u wasn't registered!\n", vid);
 		return -EINVAL;
 	}
 
@@ -1581,10 +1616,12 @@ int ncsi_start_dev(struct ncsi_dev *nd)
 		return 0;
 	}
 
-	if (ndp->flags & NCSI_DEV_HWA)
+	if (ndp->flags & NCSI_DEV_HWA) {
+		netdev_info(ndp->ndev.dev, "NCSI: Enabling HWA mode\n");
 		ret = ncsi_enable_hwa(ndp);
-	else
+	} else {
 		ret = ncsi_choose_active_channel(ndp);
+	}
 
 	return ret;
 }
@@ -1615,6 +1652,7 @@ void ncsi_stop_dev(struct ncsi_dev *nd)
 		}
 	}
 
+	netdev_printk(KERN_DEBUG, ndp->ndev.dev, "NCSI: Stopping device\n");
 	ncsi_report_link(ndp, true);
 }
 EXPORT_SYMBOL_GPL(ncsi_stop_dev);
diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
index 927dad4759d1..58186c4102f0 100644
--- a/net/ncsi/ncsi-rsp.c
+++ b/net/ncsi/ncsi-rsp.c
@@ -1032,11 +1032,19 @@ int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
 	if (payload < 0)
 		payload = ntohs(hdr->length);
 	ret = ncsi_validate_rsp_pkt(nr, payload);
-	if (ret)
+	if (ret) {
+		netdev_warn(ndp->ndev.dev,
+			    "NCSI: 'bad' packet ignored for type 0x%x\n",
+			    hdr->type);
 		goto out;
+	}
 
 	/* Process the packet */
 	ret = nrh->handler(nr);
+	if (ret)
+		netdev_err(ndp->ndev.dev,
+			   "NCSI: Handler for packet type 0x%x returned %d\n",
+			   hdr->type, ret);
 out:
 	ncsi_free_request(nr);
 	return ret;