[PATCH net-next 0/5] refactoring of ibmvnic code

[PATCH net-next 0/5] refactoring of ibmvnic code

[Lijun Pan]

This patch series refactor reset_init and init functions,
improve the debugging messages, and make some other cosmetic changes
to make the code easier to read and debug.

Lijun Pan (5):
  ibmvnic: print caller in several error messages
  ibmvnic: compare adapter->init_done_rc with more readable
    ibmvnic_rc_codes
  ibmvnic: improve ibmvnic_init and ibmvnic_reset_init
  ibmvnic: remove never executed if statement
  ibmvnic: merge ibmvnic_reset_init and ibmvnic_init

 drivers/net/ethernet/ibm/ibmvnic.c | 98 +++++++++---------------------
 1 file changed, 28 insertions(+), 70 deletions(-)

-- 
2.23.0

[PATCH net-next 1/5] ibmvnic: print caller in several error messages

[Lijun Pan]

The error messages in the changed functions are exactly the same.
In order to differentiate them and make debugging easier,
we print the function names in the error messages.

Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 5afb3c9c52d2..aba1cd9862ac 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1864,7 +1864,7 @@ static int do_change_param_reset(struct ibmvnic_adapter *adapter,
 
 	if (rc) {
 		netdev_err(adapter->netdev,
-			   "Couldn't initialize crq. rc=%d\n", rc);
+			   "%s: Couldn't initialize crq. rc=%d\n", __func__, rc);
 		return rc;
 	}
 
@@ -2089,7 +2089,7 @@ static int do_hard_reset(struct ibmvnic_adapter *adapter,
 	rc = init_crq_queue(adapter);
 	if (rc) {
 		netdev_err(adapter->netdev,
-			   "Couldn't initialize crq. rc=%d\n", rc);
+			   "%s: Couldn't initialize crq. rc=%d\n", __func__, rc);
 		return rc;
 	}
 
@@ -2912,7 +2912,7 @@ static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
 		rc = ibmvnic_reset_crq(adapter);
 
 	if (rc == H_CLOSED) {
-		dev_warn(dev, "Partner adapter not ready, waiting.\n");
+		dev_warn(dev, "%s: Partner adapter not ready, waiting.\n", __func__);
 	} else if (rc) {
 		dev_warn(dev, "Error %d registering sub-crq\n", rc);
 		goto reg_failed;
@@ -4865,7 +4865,7 @@ static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
 
 	if (rc == H_CLOSED)
 		/* Adapter is good, but other end is not ready */
-		dev_warn(dev, "Partner adapter not ready\n");
+		dev_warn(dev, "%s: Partner adapter not ready\n", __func__);
 	else if (rc != 0)
 		dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
 
@@ -4926,7 +4926,7 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter)
 	retrc = rc;
 
 	if (rc == H_CLOSED) {
-		dev_warn(dev, "Partner adapter not ready\n");
+		dev_warn(dev, "%s: Partner adapter not ready\n", __func__);
 	} else if (rc) {
 		dev_warn(dev, "Error %d opening adapter\n", rc);
 		goto reg_crq_failed;
@@ -5129,8 +5129,8 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 	do {
 		rc = init_crq_queue(adapter);
 		if (rc) {
-			dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
-				rc);
+			dev_err(&dev->dev, "%s: Couldn't initialize crq. rc=%d\n",
+				__func__, rc);
 			goto ibmvnic_init_fail;
 		}
 
-- 
2.23.0

[PATCH net-next 2/5] ibmvnic: compare adapter->init_done_rc with more readable ibmvnic_rc_codes

[Lijun Pan]

Instead of comparing (adapter->init_done_rc == 1), let it
be (adapter->init_done_rc == PARTIALSUCCESS).

Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index aba1cd9862ac..50e86e65961e 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -974,7 +974,7 @@ static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
 			return -1;
 		}
 
-		if (adapter->init_done_rc == 1) {
+		if (adapter->init_done_rc == PARTIALSUCCESS) {
 			/* Partuial success, delay and re-send */
 			mdelay(1000);
 			resend = true;
-- 
2.23.0

[PATCH net-next 3/5] ibmvnic: improve ibmvnic_init and ibmvnic_reset_init

[Lijun Pan]

When H_SEND_CRQ command returns with H_CLOSED, it means the
server's CRQ is not ready yet. Instead of resetting immediately,
we wait for the server to launch passive init.
ibmvnic_init() and ibmvnic_reset_init() should also return the
error code from ibmvnic_send_crq_init() call.

Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 50e86e65961e..e366fd42a8c4 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3568,8 +3568,7 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
 	if (rc) {
 		if (rc == H_CLOSED) {
 			dev_warn(dev, "CRQ Queue closed\n");
-			if (test_bit(0, &adapter->resetting))
-				ibmvnic_reset(adapter, VNIC_RESET_FATAL);
+			/* do not reset, report the fail, wait for passive init from server */
 		}
 
 		dev_warn(dev, "Send error (rc=%d)\n", rc);
@@ -4985,7 +4984,12 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
 
 	reinit_completion(&adapter->init_done);
 	adapter->init_done_rc = 0;
-	ibmvnic_send_crq_init(adapter);
+	rc = ibmvnic_send_crq_init(adapter);
+	if (rc) {
+		dev_err(dev, "%s: Send crq init failed with error %d\n", __func__, rc);
+		return rc;
+	}
+
 	if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
 		dev_err(dev, "Initialization sequence timed out\n");
 		return -1;
@@ -5039,7 +5043,12 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
 	adapter->from_passive_init = false;
 
 	adapter->init_done_rc = 0;
-	ibmvnic_send_crq_init(adapter);
+	rc = ibmvnic_send_crq_init(adapter);
+	if (rc) {
+		dev_err(dev, "%s: Send crq init failed with error %d\n", __func__, rc);
+		return rc;
+	}
+
 	if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
 		dev_err(dev, "Initialization sequence timed out\n");
 		return -1;
-- 
2.23.0

[PATCH net-next 4/5] ibmvnic: remove never executed if statement

[Lijun Pan]

At the beginning of the function, from_passive_init is set false by
"adapter->from_passive_init = false;",
hence the if statement will never run.

Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index e366fd42a8c4..280358dce8ba 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -5000,12 +5000,6 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
 		return adapter->init_done_rc;
 	}
 
-	if (adapter->from_passive_init) {
-		adapter->state = VNIC_OPEN;
-		adapter->from_passive_init = false;
-		return -1;
-	}
-
 	if (test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
 	    adapter->reset_reason != VNIC_RESET_MOBILITY) {
 		if (adapter->req_rx_queues != old_num_rx_queues ||
@@ -5059,12 +5053,6 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
 		return adapter->init_done_rc;
 	}
 
-	if (adapter->from_passive_init) {
-		adapter->state = VNIC_OPEN;
-		adapter->from_passive_init = false;
-		return -1;
-	}
-
 	rc = init_sub_crqs(adapter);
 	if (rc) {
 		dev_err(dev, "Initialization of sub crqs failed\n");
-- 
2.23.0

[PATCH net-next 5/5] ibmvnic: merge ibmvnic_reset_init and ibmvnic_init

[Lijun Pan]

These two functions share the majority of the code, hence merge
them together. In the meanwhile, add a reset pass-in parameter
to differentiate them. Thus, the code is easier to read and to tell
the difference between reset_init and regular init.

Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 65 ++++++------------------------
 1 file changed, 13 insertions(+), 52 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 280358dce8ba..c92615b74833 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -104,8 +104,7 @@ static int send_login(struct ibmvnic_adapter *adapter);
 static void send_cap_queries(struct ibmvnic_adapter *adapter);
 static int init_sub_crqs(struct ibmvnic_adapter *);
 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
-static int ibmvnic_init(struct ibmvnic_adapter *);
-static int ibmvnic_reset_init(struct ibmvnic_adapter *);
+static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
 static void release_crq_queue(struct ibmvnic_adapter *);
 static int __ibmvnic_set_mac(struct net_device *, u8 *);
 static int init_crq_queue(struct ibmvnic_adapter *adapter);
@@ -1868,7 +1867,7 @@ static int do_change_param_reset(struct ibmvnic_adapter *adapter,
 		return rc;
 	}
 
-	rc = ibmvnic_reset_init(adapter);
+	rc = ibmvnic_reset_init(adapter, true);
 	if (rc)
 		return IBMVNIC_INIT_FAILED;
 
@@ -1986,7 +1985,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
 			goto out;
 		}
 
-		rc = ibmvnic_reset_init(adapter);
+		rc = ibmvnic_reset_init(adapter, true);
 		if (rc) {
 			rc = IBMVNIC_INIT_FAILED;
 			goto out;
@@ -2093,7 +2092,7 @@ static int do_hard_reset(struct ibmvnic_adapter *adapter,
 		return rc;
 	}
 
-	rc = ibmvnic_init(adapter);
+	rc = ibmvnic_reset_init(adapter, false);
 	if (rc)
 		return rc;
 
@@ -4970,7 +4969,7 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter)
 	return retrc;
 }
 
-static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
+static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
 {
 	struct device *dev = &adapter->vdev->dev;
 	unsigned long timeout = msecs_to_jiffies(30000);
@@ -4979,10 +4978,12 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
 
 	adapter->from_passive_init = false;
 
-	old_num_rx_queues = adapter->req_rx_queues;
-	old_num_tx_queues = adapter->req_tx_queues;
+	if (reset) {
+		old_num_rx_queues = adapter->req_rx_queues;
+		old_num_tx_queues = adapter->req_tx_queues;
+		reinit_completion(&adapter->init_done);
+	}
 
-	reinit_completion(&adapter->init_done);
 	adapter->init_done_rc = 0;
 	rc = ibmvnic_send_crq_init(adapter);
 	if (rc) {
@@ -5000,7 +5001,8 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
 		return adapter->init_done_rc;
 	}
 
-	if (test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
+	if (reset &&
+	    test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
 	    adapter->reset_reason != VNIC_RESET_MOBILITY) {
 		if (adapter->req_rx_queues != old_num_rx_queues ||
 		    adapter->req_tx_queues != old_num_tx_queues) {
@@ -5028,47 +5030,6 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)
 	return rc;
 }
 
-static int ibmvnic_init(struct ibmvnic_adapter *adapter)
-{
-	struct device *dev = &adapter->vdev->dev;
-	unsigned long timeout = msecs_to_jiffies(30000);
-	int rc;
-
-	adapter->from_passive_init = false;
-
-	adapter->init_done_rc = 0;
-	rc = ibmvnic_send_crq_init(adapter);
-	if (rc) {
-		dev_err(dev, "%s: Send crq init failed with error %d\n", __func__, rc);
-		return rc;
-	}
-
-	if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
-		dev_err(dev, "Initialization sequence timed out\n");
-		return -1;
-	}
-
-	if (adapter->init_done_rc) {
-		release_crq_queue(adapter);
-		return adapter->init_done_rc;
-	}
-
-	rc = init_sub_crqs(adapter);
-	if (rc) {
-		dev_err(dev, "Initialization of sub crqs failed\n");
-		release_crq_queue(adapter);
-		return rc;
-	}
-
-	rc = init_sub_crq_irqs(adapter);
-	if (rc) {
-		dev_err(dev, "Failed to initialize sub crq irqs\n");
-		release_crq_queue(adapter);
-	}
-
-	return rc;
-}
-
 static struct device_attribute dev_attr_failover;
 
 static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
@@ -5131,7 +5092,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 			goto ibmvnic_init_fail;
 		}
 
-		rc = ibmvnic_init(adapter);
+		rc = ibmvnic_reset_init(adapter, false);
 		if (rc && rc != EAGAIN)
 			goto ibmvnic_init_fail;
 	} while (rc == EAGAIN);
-- 
2.23.0

Re: [PATCH net-next 1/5] ibmvnic: print caller in several error messages

[David Miller]

From: Lijun Pan <ljp@linux.ibm.com>
Date: Wed, 19 Aug 2020 00:35:08 -0500

> The error messages in the changed functions are exactly the same.
> In order to differentiate them and make debugging easier,
> we print the function names in the error messages.
> 
> Signed-off-by: Lijun Pan <ljp@linux.ibm.com>

I don't see any value in emitting function names in kernel
error log messages.

Sorry.

Re: [PATCH net-next 3/5] ibmvnic: improve ibmvnic_init and ibmvnic_reset_init

[David Miller]

From: Lijun Pan <ljp@linux.ibm.com>
Date: Wed, 19 Aug 2020 00:35:10 -0500

> +	if (rc) {
> +		dev_err(dev, "%s: Send crq init failed with error %d\n", __func__, rc);
> +		return rc;

Consistent with my feedback on patch #1, please get rid of this __func__ stuff.

Thank you.