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Date: Sat, 17 Feb 2018 17:32:46 -0600
From: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To: netdev@...r.kernel.org
Cc: jallen@...ux.vnet.ibm.com, tlfalcon@...ux.vnet.ibm.com
Subject: [PATCH net-next3/5] ibmvnic: Free and re-allocate scrqs when tx/rx
scrqs change
When the driver resets it is possible that the number of tx/rx
sub-crqs can change. This patch handles this so that the driver does
not try to access non-existent sub-crqs.
Additionally, a parameter is added to release_sub_crqs() so that
we know if the h_call to free the sub-crq needs to be made. In
the reset path we have to do a reset of the main crq, which is
a free followed by a register of the main crq. The free of main
crq results in all of the sub crq's being free'ed. When updating
sub-crq count in the reset path we do not want to h_free the
sub-crqs, they are already free'ed.
Signed-off-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 69 ++++++++++++++++++++++--------------
1 file changed, 43 insertions(+), 26 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 9cfbb20b5ac1..a3079d5c072c 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -90,7 +90,7 @@ MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static int ibmvnic_remove(struct vio_dev *);
-static void release_sub_crqs(struct ibmvnic_adapter *);
+static void release_sub_crqs(struct ibmvnic_adapter *, int);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
@@ -740,7 +740,7 @@ static int ibmvnic_login(struct net_device *netdev)
do {
if (adapter->renegotiate) {
adapter->renegotiate = false;
- release_sub_crqs(adapter);
+ release_sub_crqs(adapter, 1);
reinit_completion(&adapter->init_done);
send_cap_queries(adapter);
@@ -1602,7 +1602,7 @@ static int do_reset(struct ibmvnic_adapter *adapter,
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM ||
adapter->wait_for_reset) {
release_resources(adapter);
- release_sub_crqs(adapter);
+ release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
}
@@ -2241,24 +2241,27 @@ static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
}
static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
- struct ibmvnic_sub_crq_queue *scrq)
+ struct ibmvnic_sub_crq_queue *scrq,
+ int do_h_free)
{
struct device *dev = &adapter->vdev->dev;
long rc;
netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
- /* Close the sub-crqs */
- do {
- rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
- adapter->vdev->unit_address,
- scrq->crq_num);
- } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
+ if (do_h_free) {
+ /* Close the sub-crqs */
+ do {
+ rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
+ adapter->vdev->unit_address,
+ scrq->crq_num);
+ } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
- if (rc) {
- netdev_err(adapter->netdev,
- "Failed to release sub-CRQ %16lx, rc = %ld\n",
- scrq->crq_num, rc);
+ if (rc) {
+ netdev_err(adapter->netdev,
+ "Failed to release sub-CRQ %16lx, rc = %ld\n",
+ scrq->crq_num, rc);
+ }
}
dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
@@ -2326,12 +2329,12 @@ static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
return NULL;
}
-static void release_sub_crqs(struct ibmvnic_adapter *adapter)
+static void release_sub_crqs(struct ibmvnic_adapter *adapter, int do_h_free)
{
int i;
if (adapter->tx_scrq) {
- for (i = 0; i < adapter->req_tx_queues; i++) {
+ for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
if (!adapter->tx_scrq[i])
continue;
@@ -2344,7 +2347,8 @@ static void release_sub_crqs(struct ibmvnic_adapter *adapter)
adapter->tx_scrq[i]->irq = 0;
}
- release_sub_crq_queue(adapter, adapter->tx_scrq[i]);
+ release_sub_crq_queue(adapter, adapter->tx_scrq[i],
+ do_h_free);
}
kfree(adapter->tx_scrq);
@@ -2352,7 +2356,7 @@ static void release_sub_crqs(struct ibmvnic_adapter *adapter)
}
if (adapter->rx_scrq) {
- for (i = 0; i < adapter->req_rx_queues; i++) {
+ for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
if (!adapter->rx_scrq[i])
continue;
@@ -2365,7 +2369,8 @@ static void release_sub_crqs(struct ibmvnic_adapter *adapter)
adapter->rx_scrq[i]->irq = 0;
}
- release_sub_crq_queue(adapter, adapter->rx_scrq[i]);
+ release_sub_crq_queue(adapter, adapter->rx_scrq[i],
+ do_h_free);
}
kfree(adapter->rx_scrq);
@@ -2572,7 +2577,7 @@ static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
irq_dispose_mapping(adapter->rx_scrq[j]->irq);
}
- release_sub_crqs(adapter);
+ release_sub_crqs(adapter, 1);
return rc;
}
@@ -2654,7 +2659,7 @@ static int init_sub_crqs(struct ibmvnic_adapter *adapter)
adapter->tx_scrq = NULL;
tx_failed:
for (i = 0; i < registered_queues; i++)
- release_sub_crq_queue(adapter, allqueues[i]);
+ release_sub_crq_queue(adapter, allqueues[i], 1);
kfree(allqueues);
return -1;
}
@@ -4279,6 +4284,7 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
{
struct device *dev = &adapter->vdev->dev;
unsigned long timeout = msecs_to_jiffies(30000);
+ u64 old_num_rx_queues, old_num_tx_queues;
int rc;
if (adapter->resetting && !adapter->wait_for_reset) {
@@ -4296,6 +4302,9 @@ static int ibmvnic_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;
+
init_completion(&adapter->init_done);
adapter->init_done_rc = 0;
ibmvnic_send_crq_init(adapter);
@@ -4315,10 +4324,18 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
return -1;
}
- if (adapter->resetting && !adapter->wait_for_reset)
- rc = reset_sub_crq_queues(adapter);
- else
+ if (adapter->resetting && !adapter->wait_for_reset) {
+ if (adapter->req_rx_queues != old_num_rx_queues ||
+ adapter->req_tx_queues != old_num_tx_queues) {
+ release_sub_crqs(adapter, 0);
+ rc = init_sub_crqs(adapter);
+ } else {
+ rc = reset_sub_crq_queues(adapter);
+ }
+ } else {
rc = init_sub_crqs(adapter);
+ }
+
if (rc) {
dev_err(dev, "Initialization of sub crqs failed\n");
release_crq_queue(adapter);
@@ -4418,7 +4435,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
device_remove_file(&dev->dev, &dev_attr_failover);
ibmvnic_init_fail:
- release_sub_crqs(adapter);
+ release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
free_netdev(netdev);
@@ -4435,7 +4452,7 @@ static int ibmvnic_remove(struct vio_dev *dev)
mutex_lock(&adapter->reset_lock);
release_resources(adapter);
- release_sub_crqs(adapter);
+ release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
adapter->state = VNIC_REMOVED;
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