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Commit be6a3f38 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

net/smc: determine port attributes independent from pnet table 



For SMC it is important to know the current port state of RoCE devices.
Monitoring port states has been triggered, when a RoCE device was added
to the pnet table. To support future alternatives to the pnet table the
monitoring of ports is made independent of the existence of a pnet table.
It starts once the smc_ib_device is established.

Due to this change smc_ib_remember_port_attr() is now a local function
and shuffling its location and the location of its used functions
makes any forward references obsolete.

And the duplicate SMC_MAX_PORTS definition is removed.

Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b0402f01

net/smc/smc.h

+0 −2
Original line number Diff line number Diff line
@@ -21,8 +21,6 @@ 
#define SMCPROTO_SMC		0	/* SMC protocol, IPv4 */

#define SMCPROTO_SMC6		1	/* SMC protocol, IPv6 */



#define SMC_MAX_PORTS		2	/* Max # of ports */



extern struct proto smc_proto;

extern struct proto smc_proto6;

net/smc/smc_ib.c

+70 −60
Original line number Diff line number Diff line
@@ -143,6 +143,62 @@ int smc_ib_ready_link(struct smc_link *lnk) 
	return rc;

}



static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport)

{

	struct ib_gid_attr gattr;

	int rc;



	rc = ib_query_gid(smcibdev->ibdev, ibport, 0,

			  &smcibdev->gid[ibport - 1], &gattr);

	if (rc || !gattr.ndev)

		return -ENODEV;



	memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN);

	dev_put(gattr.ndev);

	return 0;

}



/* Create an identifier unique for this instance of SMC-R.

 * The MAC-address of the first active registered IB device

 * plus a random 2-byte number is used to create this identifier.

 * This name is delivered to the peer during connection initialization.

 */

static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,

						u8 ibport)

{

	memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],

	       sizeof(smcibdev->mac[ibport - 1]));

	get_random_bytes(&local_systemid[0], 2);

}



bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)

{

	return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;

}



static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)

{

	int rc;



	memset(&smcibdev->pattr[ibport - 1], 0,

	       sizeof(smcibdev->pattr[ibport - 1]));

	rc = ib_query_port(smcibdev->ibdev, ibport,

			   &smcibdev->pattr[ibport - 1]);

	if (rc)

		goto out;

	/* the SMC protocol requires specification of the RoCE MAC address */

	rc = smc_ib_fill_gid_and_mac(smcibdev, ibport);

	if (rc)

		goto out;

	if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET,

		     sizeof(local_systemid)) &&

	    smc_ib_port_active(smcibdev, ibport))

		/* create unique system identifier */

		smc_ib_define_local_systemid(smcibdev, ibport);

out:

	return rc;

}



/* process context wrapper for might_sleep smc_ib_remember_port_attr */

static void smc_ib_port_event_work(struct work_struct *work)

{
@@ -370,62 +426,6 @@ void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev, 
	buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0;

}



static int smc_ib_fill_gid_and_mac(struct smc_ib_device *smcibdev, u8 ibport)

{

	struct ib_gid_attr gattr;

	int rc;



	rc = ib_query_gid(smcibdev->ibdev, ibport, 0,

			  &smcibdev->gid[ibport - 1], &gattr);

	if (rc || !gattr.ndev)

		return -ENODEV;



	memcpy(smcibdev->mac[ibport - 1], gattr.ndev->dev_addr, ETH_ALEN);

	dev_put(gattr.ndev);

	return 0;

}



/* Create an identifier unique for this instance of SMC-R.

 * The MAC-address of the first active registered IB device

 * plus a random 2-byte number is used to create this identifier.

 * This name is delivered to the peer during connection initialization.

 */

static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,

						u8 ibport)

{

	memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],

	       sizeof(smcibdev->mac[ibport - 1]));

	get_random_bytes(&local_systemid[0], 2);

}



bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)

{

	return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;

}



int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)

{

	int rc;



	memset(&smcibdev->pattr[ibport - 1], 0,

	       sizeof(smcibdev->pattr[ibport - 1]));

	rc = ib_query_port(smcibdev->ibdev, ibport,

			   &smcibdev->pattr[ibport - 1]);

	if (rc)

		goto out;

	/* the SMC protocol requires specification of the RoCE MAC address */

	rc = smc_ib_fill_gid_and_mac(smcibdev, ibport);

	if (rc)

		goto out;

	if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET,

		     sizeof(local_systemid)) &&

	    smc_ib_port_active(smcibdev, ibport))

		/* create unique system identifier */

		smc_ib_define_local_systemid(smcibdev, ibport);

out:

	return rc;

}



long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)

{

	struct ib_cq_init_attr cqattr =	{
@@ -454,9 +454,6 @@ long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 
		smcibdev->roce_cq_recv = NULL;

		goto err;

	}

	INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,

			      smc_ib_global_event_handler);

	ib_register_event_handler(&smcibdev->event_handler);

	smc_wr_add_dev(smcibdev);

	smcibdev->initialized = 1;

	return rc;
@@ -472,7 +469,6 @@ static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 
		return;

	smcibdev->initialized = 0;

	smc_wr_remove_dev(smcibdev);

	ib_unregister_event_handler(&smcibdev->event_handler);

	ib_destroy_cq(smcibdev->roce_cq_recv);

	ib_destroy_cq(smcibdev->roce_cq_send);

}
@@ -483,6 +479,8 @@ static struct ib_client smc_ib_client; 
static void smc_ib_add_dev(struct ib_device *ibdev)

{

	struct smc_ib_device *smcibdev;

	u8 port_cnt;

	int i;



	if (ibdev->node_type != RDMA_NODE_IB_CA)

		return;
@@ -498,6 +496,17 @@ static void smc_ib_add_dev(struct ib_device *ibdev) 
	list_add_tail(&smcibdev->list, &smc_ib_devices.list);

	spin_unlock(&smc_ib_devices.lock);

	ib_set_client_data(ibdev, &smc_ib_client, smcibdev);

	INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,

			      smc_ib_global_event_handler);

	ib_register_event_handler(&smcibdev->event_handler);



	/* trigger reading of the port attributes */

	port_cnt = smcibdev->ibdev->phys_port_cnt;

	for (i = 0;

	     i < min_t(size_t, port_cnt, SMC_MAX_PORTS);

	     i++)

		set_bit(i, &smcibdev->port_event_mask);

	schedule_work(&smcibdev->port_event_work);

}



/* callback function for ib_register_client() */
@@ -512,6 +521,7 @@ static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 
	spin_unlock(&smc_ib_devices.lock);

	smc_pnet_remove_by_ibdev(smcibdev);

	smc_ib_cleanup_per_ibdev(smcibdev);

	ib_unregister_event_handler(&smcibdev->event_handler);

	kfree(smcibdev);

}

net/smc/smc_ib.h

+0 −1
Original line number Diff line number Diff line
@@ -51,7 +51,6 @@ struct smc_link; 
int smc_ib_register_client(void) __init;

void smc_ib_unregister_client(void);

bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);

int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport);

int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,

		      struct smc_buf_desc *buf_slot,

		      enum dma_data_direction data_direction);

net/smc/smc_pnet.c

+2 −5
Original line number Diff line number Diff line
@@ -358,9 +358,6 @@ static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info) 
		kfree(pnetelem);

		return rc;

	}

	rc = smc_ib_remember_port_attr(pnetelem->smcibdev, pnetelem->ib_port);

	if (rc)

		smc_pnet_remove_by_pnetid(pnetelem->pnet_name);

	return rc;

}
@@ -485,11 +482,11 @@ static int smc_pnet_netdev_event(struct notifier_block *this, 
	case NETDEV_REBOOT:

	case NETDEV_UNREGISTER:

		smc_pnet_remove_by_ndev(event_dev);

		return NOTIFY_OK;

	default:

		break;

	}

		return NOTIFY_DONE;

	}

}



static struct notifier_block smc_netdev_notifier = {

	.notifier_call = smc_pnet_netdev_event