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linux/drivers/infiniband/core/multicast.c
Dennis Dalessandro ba7d8117f3 IB/core, ipoib: Do not overreact to SM LID change event 
When IPoIB receives an SM LID change event, it reacts by flushing its
path record cache and rejoining multicast groups. This is the same
behavior it performs when it receives a reregistration event. This
behavior is unnecessary as an SM may have database backup or
synchronization mechanisms which permit the SM location or LID to change
without loss of multicast membership and without impact to path records.

Both opensm and the OPA FM issue reregistration events if a new SM is
started (or restarted with a new config) or an SM event occurs which
results in loss of multicast membership records by the SM (such as
opensm failover) or the SM encounters new nodes with Active ports (such
as after joining 2 fabrics by connecting switches via ISLs). Hence this
event can be depended on as the trigger for IPoIB cache and multicast
flushing.

It appears that some drivers, such as qib, and hfi1 issue the
IB_EVENT_SM_CHANGE but other drivers such as mlx4 and mlx5 do not.
Empirical testing on Mellanox EDR using ibv_asyncwatch has confirmed
that Mellanox EDR HCAs do not generate SM change events and that opensm
does generate reregistration.

An SM LID change event is generated by the mentioned drivers to reflect
that sm_lid and/or sm_sl in the local port info has changed. The intent
of this event is to permit applications and ULPs which have a local copy
of this information (or an address handle using it) to update their
information.

The intent is that the reregistration event (caused by the SM via a bit
in Set(PortInfo)) be used to inform nodes that they need to rejoin
multicast groups, resubscribe for notices and potentially update path
records.

When an SM migrates or fails over, a SM LID change event can occur. In
response IPoIB discards path records and multicast membership and loses
connectivity until these records are restored via SA requests. In very
large fabrics, it may take minutes for the SM to be ready and for the SA
responses to be supplied.  This can result in undesirable and
unnecessary IPoIB connectivity impacts. It also can result in an
unnecessary storm of SA queries from all nodes in a cluster potentially
followed by yet another storm if the SM issues the reregistration
request.

The fact the Mellanox HCAs do not even generate this event, is further
evidence that on modern IB fabrics there will be no ill side effects
from the proposed changes below to reduce the reaction by 3 kernel
components to this event. So these changes should be benign for Mellanox
IB fabrics and will benefit OPA fabrics while also making ib_core and
ULP behavor "correct" as intended by the IBTA spec and kernel RDMA event
APIs.

Address these issues by removing IB_EVENT_SM_CHANGE handling from ipoib.
IPoIB does not locally store sm_lid nor sm_sl, so it does not need to do
anything on SM LID change. IPoIB makes use of other ib_core components
to issue SA requests for it and those components correctly track SM LID
and SM LID changes.

Also in ib_core multicast handling,  remove the test for
IB_EVENT_SM_CHANGE. This code is moving all multicast groups to the
error state, which will trigger rejoins. This code is used by IPoIB as
well as the connection manager and other clients of multicast groups.
This kernel module centralizes group membership status and joins since a
node can only join a given group once but multiple ULPs or applications
may want to join the same group. It makes use of the sa_query.c
component in ib_core, which correctly trackes SM LID and SL. This
component does not track SM LID nor SL itself and hence need not react
to their changes.

Similarly in the ib_core cache code remove the handling for the
IB_EVENT_SM_CHANGE.  In this function. The ib_cache_update function
which is ultimately called is updating local copies of the pkey table,
gid table and lmc. It does not update nor retain sm_lid nor sm_sl. As
such it does not need to be called on an SM LID change. It technically
also does not need to be called on a reregistration. The LID_CHANGE,
PKEY_CHANGE, GID_CHANGE and port state change events (PORT_ERR,
PORT_ACTICE) should be sufficient triggers.

It is worth noting that the alternative of simply having the hfi1 and
qib drivers not generate the SM LID change event was explored. While
this would duplicate what Mellanox drivers do now, it is not the correct
behavior and removes the ability for an SM to migrate without requiring
reregistration. Since both opensm and OPA SM have mechanisms to backup
or synchronize registration information, it is desirable to let them
perform SM migrations (with LID or SL changes) without requiring
reregistration when they deem it appropriate.

Suggested-by: Todd Rimmer <todd.rimmer@intel.com>
Tested-by: Michael Brooks <michael.brooks@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Todd Rimmer <todd.rimmer@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-05-07 16:06:03 -03:00

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/*
* Copyright (c) 2006 Intel Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/random.h>
#include <rdma/ib_cache.h>
#include "sa.h"
static void mcast_add_one(struct ib_device *device);
static void mcast_remove_one(struct ib_device *device, void *client_data);
static struct ib_client mcast_client = {
.name = "ib_multicast",
.add = mcast_add_one,
.remove = mcast_remove_one
};
static struct ib_sa_client sa_client;
static struct workqueue_struct *mcast_wq;
static union ib_gid mgid0;
struct mcast_device;
struct mcast_port {
struct mcast_device *dev;
spinlock_t lock;
struct rb_root table;
atomic_t refcount;
struct completion comp;
u8 port_num;
};
struct mcast_device {
struct ib_device *device;
struct ib_event_handler event_handler;
int start_port;
int end_port;
struct mcast_port port[0];
};
enum mcast_state {
MCAST_JOINING,
MCAST_MEMBER,
MCAST_ERROR,
};
enum mcast_group_state {
MCAST_IDLE,
MCAST_BUSY,
MCAST_GROUP_ERROR,
MCAST_PKEY_EVENT
};
enum {
MCAST_INVALID_PKEY_INDEX = 0xFFFF
};
struct mcast_member;
struct mcast_group {
struct ib_sa_mcmember_rec rec;
struct rb_node node;
struct mcast_port *port;
spinlock_t lock;
struct work_struct work;
struct list_head pending_list;
struct list_head active_list;
struct mcast_member *last_join;
int members[NUM_JOIN_MEMBERSHIP_TYPES];
atomic_t refcount;
enum mcast_group_state state;
struct ib_sa_query *query;
u16 pkey_index;
u8 leave_state;
int retries;
};
struct mcast_member {
struct ib_sa_multicast multicast;
struct ib_sa_client *client;
struct mcast_group *group;
struct list_head list;
enum mcast_state state;
atomic_t refcount;
struct completion comp;
};
static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
void *context);
static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
void *context);
static struct mcast_group *mcast_find(struct mcast_port *port,
union ib_gid *mgid)
{
struct rb_node *node = port->table.rb_node;
struct mcast_group *group;
int ret;
while (node) {
group = rb_entry(node, struct mcast_group, node);
ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
if (!ret)
return group;
if (ret < 0)
node = node->rb_left;
else
node = node->rb_right;
}
return NULL;
}
static struct mcast_group *mcast_insert(struct mcast_port *port,
struct mcast_group *group,
int allow_duplicates)
{
struct rb_node **link = &port->table.rb_node;
struct rb_node *parent = NULL;
struct mcast_group *cur_group;
int ret;
while (*link) {
parent = *link;
cur_group = rb_entry(parent, struct mcast_group, node);
ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
sizeof group->rec.mgid);
if (ret < 0)
link = &(*link)->rb_left;
else if (ret > 0)
link = &(*link)->rb_right;
else if (allow_duplicates)
link = &(*link)->rb_left;
else
return cur_group;
}
rb_link_node(&group->node, parent, link);
rb_insert_color(&group->node, &port->table);
return NULL;
}
static void deref_port(struct mcast_port *port)
{
if (atomic_dec_and_test(&port->refcount))
complete(&port->comp);
}
static void release_group(struct mcast_group *group)
{
struct mcast_port *port = group->port;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
if (atomic_dec_and_test(&group->refcount)) {
rb_erase(&group->node, &port->table);
spin_unlock_irqrestore(&port->lock, flags);
kfree(group);
deref_port(port);
} else
spin_unlock_irqrestore(&port->lock, flags);
}
static void deref_member(struct mcast_member *member)
{
if (atomic_dec_and_test(&member->refcount))
complete(&member->comp);
}
static void queue_join(struct mcast_member *member)
{
struct mcast_group *group = member->group;
unsigned long flags;
spin_lock_irqsave(&group->lock, flags);
list_add_tail(&member->list, &group->pending_list);
if (group->state == MCAST_IDLE) {
group->state = MCAST_BUSY;
atomic_inc(&group->refcount);
queue_work(mcast_wq, &group->work);
}
spin_unlock_irqrestore(&group->lock, flags);
}
/*
* A multicast group has four types of members: full member, non member,
* sendonly non member and sendonly full member.
* We need to keep track of the number of members of each
* type based on their join state. Adjust the number of members the belong to
* the specified join states.
*/
static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
{
int i;
for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++, join_state >>= 1)
if (join_state & 0x1)
group->members[i] += inc;
}
/*
* If a multicast group has zero members left for a particular join state, but
* the group is still a member with the SA, we need to leave that join state.
* Determine which join states we still belong to, but that do not have any
* active members.
*/
static u8 get_leave_state(struct mcast_group *group)
{
u8 leave_state = 0;
int i;
for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++)
if (!group->members[i])
leave_state |= (0x1 << i);
return leave_state & group->rec.join_state;
}
static int check_selector(ib_sa_comp_mask comp_mask,
ib_sa_comp_mask selector_mask,
ib_sa_comp_mask value_mask,
u8 selector, u8 src_value, u8 dst_value)
{
int err;
if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
return 0;
switch (selector) {
case IB_SA_GT:
err = (src_value <= dst_value);
break;
case IB_SA_LT:
err = (src_value >= dst_value);
break;
case IB_SA_EQ:
err = (src_value != dst_value);
break;
default:
err = 0;
break;
}
return err;
}
static int cmp_rec(struct ib_sa_mcmember_rec *src,
struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask)
{
/* MGID must already match */
if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID &&
memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid))
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
return -EINVAL;
if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector,
src->mtu, dst->mtu))
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
src->traffic_class != dst->traffic_class)
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
return -EINVAL;
if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
IB_SA_MCMEMBER_REC_RATE, dst->rate_selector,
src->rate, dst->rate))
return -EINVAL;
if (check_selector(comp_mask,
IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
dst->packet_life_time_selector,
src->packet_life_time, dst->packet_life_time))
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl)
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
src->flow_label != dst->flow_label)
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
src->hop_limit != dst->hop_limit)
return -EINVAL;
if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope)
return -EINVAL;
/* join_state checked separately, proxy_join ignored */
return 0;
}
static int send_join(struct mcast_group *group, struct mcast_member *member)
{
struct mcast_port *port = group->port;
int ret;
group->last_join = member;
ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
port->port_num, IB_MGMT_METHOD_SET,
&member->multicast.rec,
member->multicast.comp_mask,
3000, GFP_KERNEL, join_handler, group,
&group->query);
return (ret > 0) ? 0 : ret;
}
static int send_leave(struct mcast_group *group, u8 leave_state)
{
struct mcast_port *port = group->port;
struct ib_sa_mcmember_rec rec;
int ret;
rec = group->rec;
rec.join_state = leave_state;
group->leave_state = leave_state;
ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
port->port_num, IB_SA_METHOD_DELETE, &rec,
IB_SA_MCMEMBER_REC_MGID |
IB_SA_MCMEMBER_REC_PORT_GID |
IB_SA_MCMEMBER_REC_JOIN_STATE,
3000, GFP_KERNEL, leave_handler,
group, &group->query);
return (ret > 0) ? 0 : ret;
}
static void join_group(struct mcast_group *group, struct mcast_member *member,
u8 join_state)
{
member->state = MCAST_MEMBER;
adjust_membership(group, join_state, 1);
group->rec.join_state |= join_state;
member->multicast.rec = group->rec;
member->multicast.rec.join_state = join_state;
list_move(&member->list, &group->active_list);
}
static int fail_join(struct mcast_group *group, struct mcast_member *member,
int status)
{
spin_lock_irq(&group->lock);
list_del_init(&member->list);
spin_unlock_irq(&group->lock);
return member->multicast.callback(status, &member->multicast);
}
static void process_group_error(struct mcast_group *group)
{
struct mcast_member *member;
int ret = 0;
u16 pkey_index;
if (group->state == MCAST_PKEY_EVENT)
ret = ib_find_pkey(group->port->dev->device,
group->port->port_num,
be16_to_cpu(group->rec.pkey), &pkey_index);
spin_lock_irq(&group->lock);
if (group->state == MCAST_PKEY_EVENT && !ret &&
group->pkey_index == pkey_index)
goto out;
while (!list_empty(&group->active_list)) {
member = list_entry(group->active_list.next,
struct mcast_member, list);
atomic_inc(&member->refcount);
list_del_init(&member->list);
adjust_membership(group, member->multicast.rec.join_state, -1);
member->state = MCAST_ERROR;
spin_unlock_irq(&group->lock);
ret = member->multicast.callback(-ENETRESET,
&member->multicast);
deref_member(member);
if (ret)
ib_sa_free_multicast(&member->multicast);
spin_lock_irq(&group->lock);
}
group->rec.join_state = 0;
out:
group->state = MCAST_BUSY;
spin_unlock_irq(&group->lock);
}
static void mcast_work_handler(struct work_struct *work)
{
struct mcast_group *group;
struct mcast_member *member;
struct ib_sa_multicast *multicast;
int status, ret;
u8 join_state;
group = container_of(work, typeof(*group), work);
retest:
spin_lock_irq(&group->lock);
while (!list_empty(&group->pending_list) ||
(group->state != MCAST_BUSY)) {
if (group->state != MCAST_BUSY) {
spin_unlock_irq(&group->lock);
process_group_error(group);
goto retest;
}
member = list_entry(group->pending_list.next,
struct mcast_member, list);
multicast = &member->multicast;
join_state = multicast->rec.join_state;
atomic_inc(&member->refcount);
if (join_state == (group->rec.join_state & join_state)) {
status = cmp_rec(&group->rec, &multicast->rec,
multicast->comp_mask);
if (!status)
join_group(group, member, join_state);
else
list_del_init(&member->list);
spin_unlock_irq(&group->lock);
ret = multicast->callback(status, multicast);
} else {
spin_unlock_irq(&group->lock);
status = send_join(group, member);
if (!status) {
deref_member(member);
return;
}
ret = fail_join(group, member, status);
}
deref_member(member);
if (ret)
ib_sa_free_multicast(&member->multicast);
spin_lock_irq(&group->lock);
}
join_state = get_leave_state(group);
if (join_state) {
group->rec.join_state &= ~join_state;
spin_unlock_irq(&group->lock);
if (send_leave(group, join_state))
goto retest;
} else {
group->state = MCAST_IDLE;
spin_unlock_irq(&group->lock);
release_group(group);
}
}
/*
* Fail a join request if it is still active - at the head of the pending queue.
*/
static void process_join_error(struct mcast_group *group, int status)
{
struct mcast_member *member;
int ret;
spin_lock_irq(&group->lock);
member = list_entry(group->pending_list.next,
struct mcast_member, list);
if (group->last_join == member) {
atomic_inc(&member->refcount);
list_del_init(&member->list);
spin_unlock_irq(&group->lock);
ret = member->multicast.callback(status, &member->multicast);
deref_member(member);
if (ret)
ib_sa_free_multicast(&member->multicast);
} else
spin_unlock_irq(&group->lock);
}
static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
void *context)
{
struct mcast_group *group = context;
u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
if (status)
process_join_error(group, status);
else {
int mgids_changed, is_mgid0;
if (ib_find_pkey(group->port->dev->device,
group->port->port_num, be16_to_cpu(rec->pkey),
&pkey_index))
pkey_index = MCAST_INVALID_PKEY_INDEX;
spin_lock_irq(&group->port->lock);
if (group->state == MCAST_BUSY &&
group->pkey_index == MCAST_INVALID_PKEY_INDEX)
group->pkey_index = pkey_index;
mgids_changed = memcmp(&rec->mgid, &group->rec.mgid,
sizeof(group->rec.mgid));
group->rec = *rec;
if (mgids_changed) {
rb_erase(&group->node, &group->port->table);
is_mgid0 = !memcmp(&mgid0, &group->rec.mgid,
sizeof(mgid0));
mcast_insert(group->port, group, is_mgid0);
}
spin_unlock_irq(&group->port->lock);
}
mcast_work_handler(&group->work);
}
static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
void *context)
{
struct mcast_group *group = context;
if (status && group->retries > 0 &&
!send_leave(group, group->leave_state))
group->retries--;
else
mcast_work_handler(&group->work);
}
static struct mcast_group *acquire_group(struct mcast_port *port,
union ib_gid *mgid, gfp_t gfp_mask)
{
struct mcast_group *group, *cur_group;
unsigned long flags;
int is_mgid0;
is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
if (!is_mgid0) {
spin_lock_irqsave(&port->lock, flags);
group = mcast_find(port, mgid);
if (group)
goto found;
spin_unlock_irqrestore(&port->lock, flags);
}
group = kzalloc(sizeof *group, gfp_mask);
if (!group)
return NULL;
group->retries = 3;
group->port = port;
group->rec.mgid = *mgid;
group->pkey_index = MCAST_INVALID_PKEY_INDEX;
INIT_LIST_HEAD(&group->pending_list);
INIT_LIST_HEAD(&group->active_list);
INIT_WORK(&group->work, mcast_work_handler);
spin_lock_init(&group->lock);
spin_lock_irqsave(&port->lock, flags);
cur_group = mcast_insert(port, group, is_mgid0);
if (cur_group) {
kfree(group);
group = cur_group;
} else
atomic_inc(&port->refcount);
found:
atomic_inc(&group->refcount);
spin_unlock_irqrestore(&port->lock, flags);
return group;
}
/*
* We serialize all join requests to a single group to make our lives much
* easier. Otherwise, two users could try to join the same group
* simultaneously, with different configurations, one could leave while the
* join is in progress, etc., which makes locking around error recovery
* difficult.
*/
struct ib_sa_multicast *
ib_sa_join_multicast(struct ib_sa_client *client,
struct ib_device *device, u8 port_num,
struct ib_sa_mcmember_rec *rec,
ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
int (*callback)(int status,
struct ib_sa_multicast *multicast),
void *context)
{
struct mcast_device *dev;
struct mcast_member *member;
struct ib_sa_multicast *multicast;
int ret;
dev = ib_get_client_data(device, &mcast_client);
if (!dev)
return ERR_PTR(-ENODEV);
member = kmalloc(sizeof *member, gfp_mask);
if (!member)
return ERR_PTR(-ENOMEM);
ib_sa_client_get(client);
member->client = client;
member->multicast.rec = *rec;
member->multicast.comp_mask = comp_mask;
member->multicast.callback = callback;
member->multicast.context = context;
init_completion(&member->comp);
atomic_set(&member->refcount, 1);
member->state = MCAST_JOINING;
member->group = acquire_group(&dev->port[port_num - dev->start_port],
&rec->mgid, gfp_mask);
if (!member->group) {
ret = -ENOMEM;
goto err;
}
/*
* The user will get the multicast structure in their callback. They
* could then free the multicast structure before we can return from
* this routine. So we save the pointer to return before queuing
* any callback.
*/
multicast = &member->multicast;
queue_join(member);
return multicast;
err:
ib_sa_client_put(client);
kfree(member);
return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_sa_join_multicast);
void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
{
struct mcast_member *member;
struct mcast_group *group;
member = container_of(multicast, struct mcast_member, multicast);
group = member->group;
spin_lock_irq(&group->lock);
if (member->state == MCAST_MEMBER)
adjust_membership(group, multicast->rec.join_state, -1);
list_del_init(&member->list);
if (group->state == MCAST_IDLE) {
group->state = MCAST_BUSY;
spin_unlock_irq(&group->lock);
/* Continue to hold reference on group until callback */
queue_work(mcast_wq, &group->work);
} else {
spin_unlock_irq(&group->lock);
release_group(group);
}
deref_member(member);
wait_for_completion(&member->comp);
ib_sa_client_put(member->client);
kfree(member);
}
EXPORT_SYMBOL(ib_sa_free_multicast);
int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
{
struct mcast_device *dev;
struct mcast_port *port;
struct mcast_group *group;
unsigned long flags;
int ret = 0;
dev = ib_get_client_data(device, &mcast_client);
if (!dev)
return -ENODEV;
port = &dev->port[port_num - dev->start_port];
spin_lock_irqsave(&port->lock, flags);
group = mcast_find(port, mgid);
if (group)
*rec = group->rec;
else
ret = -EADDRNOTAVAIL;
spin_unlock_irqrestore(&port->lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
/**
* ib_init_ah_from_mcmember - Initialize AH attribute from multicast
* member record and gid of the device.
* @device: RDMA device
* @port_num: Port of the rdma device to consider
* @ndev: Optional netdevice, applicable only for RoCE
* @gid_type: GID type to consider
* @ah_attr: AH attribute to fillup on successful completion
*
* ib_init_ah_from_mcmember() initializes AH attribute based on multicast
* member record and other device properties. On success the caller is
* responsible to call rdma_destroy_ah_attr on the ah_attr. Returns 0 on
* success or appropriate error code.
*
*/
int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
struct ib_sa_mcmember_rec *rec,
struct net_device *ndev,
enum ib_gid_type gid_type,
struct rdma_ah_attr *ah_attr)
{
const struct ib_gid_attr *sgid_attr;
/* GID table is not based on the netdevice for IB link layer,
* so ignore ndev during search.
*/
if (rdma_protocol_ib(device, port_num))
ndev = NULL;
else if (!rdma_protocol_roce(device, port_num))
return -EINVAL;
sgid_attr = rdma_find_gid_by_port(device, &rec->port_gid,
gid_type, port_num, ndev);
if (IS_ERR(sgid_attr))
return PTR_ERR(sgid_attr);
memset(ah_attr, 0, sizeof(*ah_attr));
ah_attr->type = rdma_ah_find_type(device, port_num);
rdma_ah_set_dlid(ah_attr, be16_to_cpu(rec->mlid));
rdma_ah_set_sl(ah_attr, rec->sl);
rdma_ah_set_port_num(ah_attr, port_num);
rdma_ah_set_static_rate(ah_attr, rec->rate);
rdma_move_grh_sgid_attr(ah_attr, &rec->mgid,
be32_to_cpu(rec->flow_label),
rec->hop_limit, rec->traffic_class,
sgid_attr);
return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_mcmember);
static void mcast_groups_event(struct mcast_port *port,
enum mcast_group_state state)
{
struct mcast_group *group;
struct rb_node *node;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
for (node = rb_first(&port->table); node; node = rb_next(node)) {
group = rb_entry(node, struct mcast_group, node);
spin_lock(&group->lock);
if (group->state == MCAST_IDLE) {
atomic_inc(&group->refcount);
queue_work(mcast_wq, &group->work);
}
if (group->state != MCAST_GROUP_ERROR)
group->state = state;
spin_unlock(&group->lock);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static void mcast_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct mcast_device *dev;
int index;
dev = container_of(handler, struct mcast_device, event_handler);
if (!rdma_cap_ib_mcast(dev->device, event->element.port_num))
return;
index = event->element.port_num - dev->start_port;
switch (event->event) {
case IB_EVENT_PORT_ERR:
case IB_EVENT_LID_CHANGE:
case IB_EVENT_CLIENT_REREGISTER:
mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
break;
case IB_EVENT_PKEY_CHANGE:
mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
break;
default:
break;
}
}
static void mcast_add_one(struct ib_device *device)
{
struct mcast_device *dev;
struct mcast_port *port;
int i;
int count = 0;
dev = kmalloc(struct_size(dev, port, device->phys_port_cnt),
GFP_KERNEL);
if (!dev)
return;
dev->start_port = rdma_start_port(device);
dev->end_port = rdma_end_port(device);
for (i = 0; i <= dev->end_port - dev->start_port; i++) {
if (!rdma_cap_ib_mcast(device, dev->start_port + i))
continue;
port = &dev->port[i];
port->dev = dev;
port->port_num = dev->start_port + i;
spin_lock_init(&port->lock);
port->table = RB_ROOT;
init_completion(&port->comp);
atomic_set(&port->refcount, 1);
++count;
}
if (!count) {
kfree(dev);
return;
}
dev->device = device;
ib_set_client_data(device, &mcast_client, dev);
INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
ib_register_event_handler(&dev->event_handler);
}
static void mcast_remove_one(struct ib_device *device, void *client_data)
{
struct mcast_device *dev = client_data;
struct mcast_port *port;
int i;
if (!dev)
return;
ib_unregister_event_handler(&dev->event_handler);
flush_workqueue(mcast_wq);
for (i = 0; i <= dev->end_port - dev->start_port; i++) {
if (rdma_cap_ib_mcast(device, dev->start_port + i)) {
port = &dev->port[i];
deref_port(port);
wait_for_completion(&port->comp);
}
}
kfree(dev);
}
int mcast_init(void)
{
int ret;
mcast_wq = alloc_ordered_workqueue("ib_mcast", WQ_MEM_RECLAIM);
if (!mcast_wq)
return -ENOMEM;
ib_sa_register_client(&sa_client);
ret = ib_register_client(&mcast_client);
if (ret)
goto err;
return 0;
err:
ib_sa_unregister_client(&sa_client);
destroy_workqueue(mcast_wq);
return ret;
}
void mcast_cleanup(void)
{
ib_unregister_client(&mcast_client);
ib_sa_unregister_client(&sa_client);
destroy_workqueue(mcast_wq);
}
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