[PATCH net v2 4/4] ibmvnic: Serialize device queries
Thomas Falcon
tlfalcon at linux.ibm.com
Tue Nov 26 10:12:56 AEDT 2019
Provide some serialization for device CRQ commands
and queries to ensure that the shared variable used for
storing return codes is properly synchronized.
Signed-off-by: Thomas Falcon <tlfalcon at linux.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 54 ++++++++++++++++++++++++++++++++++----
drivers/net/ethernet/ibm/ibmvnic.h | 2 ++
2 files changed, 51 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 4504f96ee07d..42e15b31a5ff 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -210,11 +210,14 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
ltb->map_id = adapter->map_id;
adapter->map_id++;
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
rc = send_request_map(adapter, ltb->addr,
ltb->size, ltb->map_id);
if (rc) {
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
@@ -224,6 +227,7 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
"Long term map request aborted or timed out,rc = %d\n",
rc);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
@@ -231,8 +235,10 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
dev_err(dev, "Couldn't map long term buffer,rc = %d\n",
adapter->fw_done_rc);
dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
+ mutex_unlock(&adapter->fw_lock);
return -1;
}
+ mutex_unlock(&adapter->fw_lock);
return 0;
}
@@ -258,15 +264,21 @@ static int reset_long_term_buff(struct ibmvnic_adapter *adapter,
memset(ltb->buff, 0, ltb->size);
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
+
reinit_completion(&adapter->fw_done);
rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
- if (rc)
+ if (rc) {
+ mutex_unlock(&adapter->fw_lock);
return rc;
+ }
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_info(dev,
"Reset failed, long term map request timed out or aborted\n");
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
@@ -274,8 +286,10 @@ static int reset_long_term_buff(struct ibmvnic_adapter *adapter,
dev_info(dev,
"Reset failed, attempting to free and reallocate buffer\n");
free_long_term_buff(adapter, ltb);
+ mutex_unlock(&adapter->fw_lock);
return alloc_long_term_buff(adapter, ltb, ltb->size);
}
+ mutex_unlock(&adapter->fw_lock);
return 0;
}
@@ -992,18 +1006,25 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
if (adapter->vpd->buff)
len = adapter->vpd->len;
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
+
crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
crq.get_vpd_size.cmd = GET_VPD_SIZE;
rc = ibmvnic_send_crq(adapter, &crq);
- if (rc)
+ if (rc) {
+ mutex_unlock(&adapter->fw_lock);
return rc;
+ }
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
if (rc) {
dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
+ mutex_unlock(&adapter->fw_lock);
if (!adapter->vpd->len)
return -ENODATA;
@@ -1030,7 +1051,10 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
return -ENOMEM;
}
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
+
crq.get_vpd.first = IBMVNIC_CRQ_CMD;
crq.get_vpd.cmd = GET_VPD;
crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
@@ -1039,6 +1063,7 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
if (rc) {
kfree(adapter->vpd->buff);
adapter->vpd->buff = NULL;
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
@@ -1047,9 +1072,11 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
kfree(adapter->vpd->buff);
adapter->vpd->buff = NULL;
+ mutex_unlock(&adapter->fw_lock);
return rc;
}
+ mutex_unlock(&adapter->fw_lock);
return 0;
}
@@ -1750,10 +1777,14 @@ static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
+
rc = ibmvnic_send_crq(adapter, &crq);
if (rc) {
rc = -EIO;
+ mutex_unlock(&adapter->fw_lock);
goto err;
}
@@ -1761,9 +1792,10 @@ static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
/* netdev->dev_addr is changed in handle_change_mac_rsp function */
if (rc || adapter->fw_done_rc) {
rc = -EIO;
+ mutex_unlock(&adapter->fw_lock);
goto err;
}
-
+ mutex_unlock(&adapter->fw_lock);
return 0;
err:
ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
@@ -4481,15 +4513,24 @@ static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
memset(&crq, 0, sizeof(crq));
crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
+
+ mutex_lock(&adapter->fw_lock);
+ adapter->fw_done_rc = 0;
reinit_completion(&adapter->fw_done);
+
rc = ibmvnic_send_crq(adapter, &crq);
- if (rc)
+ if (rc) {
+ mutex_unlock(&adapter->fw_lock);
return rc;
+ }
rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
- if (rc)
+ if (rc) {
+ mutex_unlock(&adapter->fw_lock);
return rc;
+ }
+ mutex_unlock(&adapter->fw_lock);
return adapter->fw_done_rc ? -EIO : 0;
}
@@ -5045,6 +5086,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
__ibmvnic_delayed_reset);
INIT_LIST_HEAD(&adapter->rwi_list);
spin_lock_init(&adapter->rwi_lock);
+ mutex_init(&adapter->fw_lock);
init_completion(&adapter->init_done);
init_completion(&adapter->fw_done);
init_completion(&adapter->reset_done);
@@ -5106,6 +5148,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
ibmvnic_init_fail:
release_sub_crqs(adapter, 1);
release_crq_queue(adapter);
+ mutex_destroy(&adapter->fw_lock);
free_netdev(netdev);
return rc;
@@ -5130,6 +5173,7 @@ static int ibmvnic_remove(struct vio_dev *dev)
adapter->state = VNIC_REMOVED;
rtnl_unlock();
+ mutex_destroy(&adapter->fw_lock);
device_remove_file(&dev->dev, &dev_attr_failover);
free_netdev(netdev);
dev_set_drvdata(&dev->dev, NULL);
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index ebc39248b334..60eccaf91b12 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -1026,6 +1026,8 @@ struct ibmvnic_adapter {
int init_done_rc;
struct completion fw_done;
+ /* Used for serialization of device commands */
+ struct mutex fw_lock;
int fw_done_rc;
struct completion reset_done;
--
2.12.3
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