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Commit 49a473f5 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'ibmvnic-Failover-hardening' 



Thomas Falcon says:

====================
ibmvnic: Failover hardening

Introduce additional transport event hardening to handle
events during device reset. In the driver's current state,
if a transport event is received during device reset, it can
cause the device to become unresponsive as invalid operations
are processed as the backing device context changes. After
a transport event, the device expects a request to begin the
initialization process. If the driver is still processing
a previously queued device reset in this state, it is likely
to fail as firmware will reject any commands other than the
one to initialize the client driver's Command-Response Queue.

Instead of failing and becoming dormant, the driver will make
one more attempt to recover and continue operation. This is
achieved by setting a state flag, which if true will direct
the driver to clean up all allocated resources and perform
a hard reset in an attempt to bring the driver back to an
operational state.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 180f848b 2770a798

drivers/net/ethernet/ibm/ibmvnic.c

+200 −23
Original line number Diff line number Diff line
@@ -109,13 +109,14 @@ static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *, 
					struct ibmvnic_sub_crq_queue *);

static int ibmvnic_poll(struct napi_struct *napi, int data);

static void send_map_query(struct ibmvnic_adapter *adapter);

static void send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);

static void send_request_unmap(struct ibmvnic_adapter *, u8);

static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);

static int send_request_unmap(struct ibmvnic_adapter *, u8);

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 void release_crq_queue(struct ibmvnic_adapter *);

static int __ibmvnic_set_mac(struct net_device *netdev, struct sockaddr *p);

static int init_crq_queue(struct ibmvnic_adapter *adapter);
@@ -172,6 +173,7 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, 
				struct ibmvnic_long_term_buff *ltb, int size)

{

	struct device *dev = &adapter->vdev->dev;

	int rc;



	ltb->size = size;

	ltb->buff = dma_alloc_coherent(dev, ltb->size, &ltb->addr,
@@ -185,8 +187,12 @@ static int alloc_long_term_buff(struct ibmvnic_adapter *adapter, 
	adapter->map_id++;



	init_completion(&adapter->fw_done);

	send_request_map(adapter, ltb->addr,

	rc = send_request_map(adapter, ltb->addr,

			      ltb->size, ltb->map_id);

	if (rc) {

		dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);

		return rc;

	}

	wait_for_completion(&adapter->fw_done);



	if (adapter->fw_done_rc) {
@@ -215,10 +221,14 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter, 
static int reset_long_term_buff(struct ibmvnic_adapter *adapter,

				struct ibmvnic_long_term_buff *ltb)

{

	int rc;



	memset(ltb->buff, 0, ltb->size);



	init_completion(&adapter->fw_done);

	send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);

	rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);

	if (rc)

		return rc;

	wait_for_completion(&adapter->fw_done);



	if (adapter->fw_done_rc) {
@@ -789,6 +799,7 @@ static void release_napi(struct ibmvnic_adapter *adapter) 
	kfree(adapter->napi);

	adapter->napi = NULL;

	adapter->num_active_rx_napi = 0;

	adapter->napi_enabled = false;

}



static int ibmvnic_login(struct net_device *netdev)
@@ -919,6 +930,10 @@ static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state) 
			/* Partuial success, delay and re-send */

			mdelay(1000);

			resend = true;

		} else if (adapter->init_done_rc) {

			netdev_warn(netdev, "Unable to set link state, rc=%d\n",

				    adapter->init_done_rc);

			return adapter->init_done_rc;

		}

	} while (resend);
@@ -951,6 +966,7 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter) 
	struct device *dev = &adapter->vdev->dev;

	union ibmvnic_crq crq;

	int len = 0;

	int rc;



	if (adapter->vpd->buff)

		len = adapter->vpd->len;
@@ -958,7 +974,9 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter) 
	init_completion(&adapter->fw_done);

	crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;

	crq.get_vpd_size.cmd = GET_VPD_SIZE;

	ibmvnic_send_crq(adapter, &crq);

	rc = ibmvnic_send_crq(adapter, &crq);

	if (rc)

		return rc;

	wait_for_completion(&adapter->fw_done);



	if (!adapter->vpd->len)
@@ -991,7 +1009,12 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter) 
	crq.get_vpd.cmd = GET_VPD;

	crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);

	crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);

	ibmvnic_send_crq(adapter, &crq);

	rc = ibmvnic_send_crq(adapter, &crq);

	if (rc) {

		kfree(adapter->vpd->buff);

		adapter->vpd->buff = NULL;

		return rc;

	}

	wait_for_completion(&adapter->fw_done);



	return 0;
@@ -1690,6 +1713,7 @@ static int __ibmvnic_set_mac(struct net_device *netdev, struct sockaddr *p) 
	struct ibmvnic_adapter *adapter = netdev_priv(netdev);

	struct sockaddr *addr = p;

	union ibmvnic_crq crq;

	int rc;



	if (!is_valid_ether_addr(addr->sa_data))

		return -EADDRNOTAVAIL;
@@ -1700,7 +1724,9 @@ static int __ibmvnic_set_mac(struct net_device *netdev, struct sockaddr *p) 
	ether_addr_copy(&crq.change_mac_addr.mac_addr[0], addr->sa_data);



	init_completion(&adapter->fw_done);

	ibmvnic_send_crq(adapter, &crq);

	rc = ibmvnic_send_crq(adapter, &crq);

	if (rc)

		return rc;

	wait_for_completion(&adapter->fw_done);

	/* netdev->dev_addr is changed in handle_change_mac_rsp function */

	return adapter->fw_done_rc ? -EIO : 0;
@@ -1782,7 +1808,7 @@ static int do_reset(struct ibmvnic_adapter *adapter, 
			return rc;

		}



		rc = ibmvnic_init(adapter);

		rc = ibmvnic_reset_init(adapter);

		if (rc)

			return IBMVNIC_INIT_FAILED;
@@ -1852,6 +1878,85 @@ static int do_reset(struct ibmvnic_adapter *adapter, 
	return 0;

}



static int do_hard_reset(struct ibmvnic_adapter *adapter,

			 struct ibmvnic_rwi *rwi, u32 reset_state)

{

	struct net_device *netdev = adapter->netdev;

	int rc;



	netdev_dbg(adapter->netdev, "Hard resetting driver (%d)\n",

		   rwi->reset_reason);



	netif_carrier_off(netdev);

	adapter->reset_reason = rwi->reset_reason;



	ibmvnic_cleanup(netdev);

	release_resources(adapter);

	release_sub_crqs(adapter, 0);

	release_crq_queue(adapter);



	/* remove the closed state so when we call open it appears

	 * we are coming from the probed state.

	 */

	adapter->state = VNIC_PROBED;



	rc = init_crq_queue(adapter);

	if (rc) {

		netdev_err(adapter->netdev,

			   "Couldn't initialize crq. rc=%d\n", rc);

		return rc;

	}



	rc = ibmvnic_init(adapter);

	if (rc)

		return rc;



	/* If the adapter was in PROBE state prior to the reset,

	 * exit here.

	 */

	if (reset_state == VNIC_PROBED)

		return 0;



	rc = ibmvnic_login(netdev);

	if (rc) {

		adapter->state = VNIC_PROBED;

		return 0;

	}

	/* netif_set_real_num_xx_queues needs to take rtnl lock here

	 * unless wait_for_reset is set, in which case the rtnl lock

	 * has already been taken before initializing the reset

	 */

	if (!adapter->wait_for_reset) {

		rtnl_lock();

		rc = init_resources(adapter);

		rtnl_unlock();

	} else {

		rc = init_resources(adapter);

	}

	if (rc)

		return rc;



	ibmvnic_disable_irqs(adapter);

	adapter->state = VNIC_CLOSED;



	if (reset_state == VNIC_CLOSED)

		return 0;



	rc = __ibmvnic_open(netdev);

	if (rc) {

		if (list_empty(&adapter->rwi_list))

			adapter->state = VNIC_CLOSED;

		else

			adapter->state = reset_state;



		return 0;

	}



	netif_carrier_on(netdev);



	return 0;

}



static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)

{

	struct ibmvnic_rwi *rwi;
@@ -1893,14 +1998,19 @@ static void __ibmvnic_reset(struct work_struct *work) 
	netdev = adapter->netdev;



	mutex_lock(&adapter->reset_lock);

	adapter->resetting = true;

	reset_state = adapter->state;



	rwi = get_next_rwi(adapter);

	while (rwi) {

		if (adapter->force_reset_recovery) {

			adapter->force_reset_recovery = false;

			rc = do_hard_reset(adapter, rwi, reset_state);

		} else {

			rc = do_reset(adapter, rwi, reset_state);

		}

		kfree(rwi);

		if (rc && rc != IBMVNIC_INIT_FAILED)

		if (rc && rc != IBMVNIC_INIT_FAILED &&

		    !adapter->force_reset_recovery)

			break;



		rwi = get_next_rwi(adapter);
@@ -1926,9 +2036,9 @@ static void __ibmvnic_reset(struct work_struct *work) 
static int ibmvnic_reset(struct ibmvnic_adapter *adapter,

			 enum ibmvnic_reset_reason reason)

{

	struct list_head *entry, *tmp_entry;

	struct ibmvnic_rwi *rwi, *tmp;

	struct net_device *netdev = adapter->netdev;

	struct list_head *entry;

	int ret;



	if (adapter->state == VNIC_REMOVING ||
@@ -1964,11 +2074,17 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter, 
		ret = ENOMEM;

		goto err;

	}



	/* if we just received a transport event,

	 * flush reset queue and process this reset

	 */

	if (adapter->force_reset_recovery && !list_empty(&adapter->rwi_list)) {

		list_for_each_safe(entry, tmp_entry, &adapter->rwi_list)

			list_del(entry);

	}

	rwi->reset_reason = reason;

	list_add_tail(&rwi->list, &adapter->rwi_list);

	mutex_unlock(&adapter->rwi_lock);



	adapter->resetting = true;

	netdev_dbg(adapter->netdev, "Scheduling reset (reason %d)\n", reason);

	schedule_work(&adapter->ibmvnic_reset);
@@ -2364,6 +2480,7 @@ static void ibmvnic_get_ethtool_stats(struct net_device *dev, 
	struct ibmvnic_adapter *adapter = netdev_priv(dev);

	union ibmvnic_crq crq;

	int i, j;

	int rc;



	memset(&crq, 0, sizeof(crq));

	crq.request_statistics.first = IBMVNIC_CRQ_CMD;
@@ -2374,7 +2491,9 @@ static void ibmvnic_get_ethtool_stats(struct net_device *dev, 


	/* Wait for data to be written */

	init_completion(&adapter->stats_done);

	ibmvnic_send_crq(adapter, &crq);

	rc = ibmvnic_send_crq(adapter, &crq);

	if (rc)

		return;

	wait_for_completion(&adapter->stats_done);



	for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
@@ -3146,6 +3265,12 @@ static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter, 
		   (unsigned long int)cpu_to_be64(u64_crq[0]),

		   (unsigned long int)cpu_to_be64(u64_crq[1]));



	if (!adapter->crq.active &&

	    crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {

		dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");

		return -EINVAL;

	}



	/* Make sure the hypervisor sees the complete request */

	mb();
@@ -3370,7 +3495,7 @@ static int send_login(struct ibmvnic_adapter *adapter) 
	return -1;

}



static void send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,

static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,

			    u32 len, u8 map_id)

{

	union ibmvnic_crq crq;
@@ -3381,10 +3506,10 @@ static void send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr, 
	crq.request_map.map_id = map_id;

	crq.request_map.ioba = cpu_to_be32(addr);

	crq.request_map.len = cpu_to_be32(len);

	ibmvnic_send_crq(adapter, &crq);

	return ibmvnic_send_crq(adapter, &crq);

}



static void send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)

static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)

{

	union ibmvnic_crq crq;
@@ -3392,7 +3517,7 @@ static void send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id) 
	crq.request_unmap.first = IBMVNIC_CRQ_CMD;

	crq.request_unmap.cmd = REQUEST_UNMAP;

	crq.request_unmap.map_id = map_id;

	ibmvnic_send_crq(adapter, &crq);

	return ibmvnic_send_crq(adapter, &crq);

}



static void send_map_query(struct ibmvnic_adapter *adapter)
@@ -4219,11 +4344,15 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq, 
			dev_info(dev, "Partner initialized\n");

			adapter->from_passive_init = true;

			adapter->failover_pending = false;

			if (!completion_done(&adapter->init_done)) {

				complete(&adapter->init_done);

				adapter->init_done_rc = -EIO;

			}

			ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);

			break;

		case IBMVNIC_CRQ_INIT_COMPLETE:

			dev_info(dev, "Partner initialization complete\n");

			adapter->crq.active = true;

			send_version_xchg(adapter);

			break;

		default:
@@ -4232,6 +4361,9 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq, 
		return;

	case IBMVNIC_CRQ_XPORT_EVENT:

		netif_carrier_off(netdev);

		adapter->crq.active = false;

		if (adapter->resetting)

			adapter->force_reset_recovery = true;

		if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {

			dev_info(dev, "Migrated, re-enabling adapter\n");

			ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
@@ -4419,6 +4551,7 @@ static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter) 
	/* Clean out the queue */

	memset(crq->msgs, 0, PAGE_SIZE);

	crq->cur = 0;

	crq->active = false;



	/* And re-open it again */

	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
@@ -4453,6 +4586,7 @@ static void release_crq_queue(struct ibmvnic_adapter *adapter) 
			 DMA_BIDIRECTIONAL);

	free_page((unsigned long)crq->msgs);

	crq->msgs = NULL;

	crq->active = false;

}



static int init_crq_queue(struct ibmvnic_adapter *adapter)
@@ -4530,7 +4664,7 @@ static int init_crq_queue(struct ibmvnic_adapter *adapter) 
	return retrc;

}



static int ibmvnic_init(struct ibmvnic_adapter *adapter)

static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter)

{

	struct device *dev = &adapter->vdev->dev;

	unsigned long timeout = msecs_to_jiffies(30000);
@@ -4589,6 +4723,49 @@ static int ibmvnic_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;



	init_completion(&adapter->init_done);

	adapter->init_done_rc = 0;

	ibmvnic_send_crq_init(adapter);

	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;

	}



	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");

		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)

drivers/net/ethernet/ibm/ibmvnic.h

+2 −0
Original line number Diff line number Diff line
@@ -865,6 +865,7 @@ struct ibmvnic_crq_queue { 
	int size, cur;

	dma_addr_t msg_token;

	spinlock_t lock;

	bool active;

};



union sub_crq {
@@ -1108,6 +1109,7 @@ struct ibmvnic_adapter { 


	bool mac_change_pending;

	bool failover_pending;

	bool force_reset_recovery;



	struct ibmvnic_tunables desired;

	struct ibmvnic_tunables fallback;