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IB/core: Refactor GID modify code for RoCE

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Code is refactored to prepare separate functions for RoCE which can do more
complex operations related to reference counting, while still
maintainining code readability. This includes
(a) Simplification to not perform netdevice checks and modifications
for IB link layer.
(b) Do not add RoCE GID entry which has NULL netdevice; instead return
an error.
(c) If GID addition fails at provider level add_gid(), do not add the
entry in the cache and keep the entry marked as INVALID.
(d) Simplify and reuse the ib_cache_gid_add()/del() routines so that they
can be used even for modifying default GIDs. This avoid some code
duplication in modifying default GIDs.
(e) find_gid() routine refers to the data entry flags to qualify a GID
as valid or invalid GID rather than depending on attributes and zeroness
of the GID content.
(f) gid_table_reserve_default() sets the GID default attribute at
beginning while setting up the GID table. There is no need to use
default_gid flag in low level functions such as write_gid(), add_gid(),
del_gid(), as they never need to update the DEFAULT property of the GID
entry while during GID table update.

As as result of this refactor, reserved GID 0:0:0:0:0:0:0:0 is no longer
searchable as described below.

A unicast GID entry of 0:0:0:0:0:0:0:0 is Reserved GID as per the IB
spec version 1.3 section 4.1.1, point (6) whose snippet is below.

"The unicast GID address 0:0:0:0:0:0:0:0 is reserved - referred to as
the Reserved GID. It shall never be assigned to any endport. It shall
not be used as a destination address or in a global routing header
(GRH)."

GID table cache now only stores valid GID entries. Before this patch,
Reserved GID 0:0:0:0:0:0:0:0 was searchable in the GID table using
ib_find_cached_gid_by_port() and other similar find routines.

Zero GID is no longer searchable as it shall not to be present in GRH or
path recored entry as described in IB spec version 1.3 section 4.1.1,
point (6), section 12.7.10 and section 12.7.20.

ib_cache_update() is simplified to check link layer once, use unified
locking scheme for all link layers, removed temporary gid table
allocation/free logic.

Additionally,
(a) Expand ib_gid_attr to store port and index so that GID query
routines can get port and index information from the attribute structure.
(b) Expand ib_gid_attr to store device as well so that in future code when
GID reference counting is done, device is used to reach back to the GID
table entry.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Parav Pandit 2018-04-01 15:08:21 +03:00 committed by Jason Gunthorpe
parent f35faa4ba9
commit 598ff6bae6
3 changed files with 273 additions and 236 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

486
drivers/infiniband/core/cache.c
View File

@ -59,8 +59,6 @@ struct ib_update_work {
union ib_gid zgid; union ib_gid zgid;
EXPORT_SYMBOL(zgid); EXPORT_SYMBOL(zgid);
static const struct ib_gid_attr zattr;
enum gid_attr_find_mask { enum gid_attr_find_mask {
GID_ATTR_FIND_MASK_GID = 1UL << 0, GID_ATTR_FIND_MASK_GID = 1UL << 0,
GID_ATTR_FIND_MASK_NETDEV = 1UL << 1, GID_ATTR_FIND_MASK_NETDEV = 1UL << 1,
@ -73,15 +71,6 @@ enum gid_table_entry_props {
GID_TABLE_ENTRY_DEFAULT = 1UL << 1, GID_TABLE_ENTRY_DEFAULT = 1UL << 1,
}; };
enum gid_table_write_action {
GID_TABLE_WRITE_ACTION_ADD,
GID_TABLE_WRITE_ACTION_DEL,
/* MODIFY only updates the GID table. Currently only used by
* ib_cache_update.
*/
GID_TABLE_WRITE_ACTION_MODIFY
};
struct ib_gid_table_entry { struct ib_gid_table_entry {
unsigned long props; unsigned long props;
union ib_gid gid; union ib_gid gid;
@ -100,16 +89,13 @@ struct ib_gid_table {
* (a) Find the GID * (a) Find the GID
* (b) Delete it. * (b) Delete it.
* *
* Add/delete should be carried out atomically.
* This is done by locking this mutex from multiple
* writers. We don't need this lock for IB, as the MAD
* layer replaces all entries. All data_vec entries
* are locked by this lock.
**/ **/
struct mutex lock; /* Any writer to data_vec must hold this lock and the write side of
/* This lock protects the table entries from being * rwlock. readers must hold only rwlock. All writers must be in a
* read and written simultaneously. * sleepable context.
*/ */
struct mutex lock;
/* rwlock protects data_vec[ix]->props. */
rwlock_t rwlock; rwlock_t rwlock;
struct ib_gid_table_entry *data_vec; struct ib_gid_table_entry *data_vec;
}; };
@ -163,94 +149,128 @@ int ib_cache_gid_parse_type_str(const char *buf)
} }
EXPORT_SYMBOL(ib_cache_gid_parse_type_str); EXPORT_SYMBOL(ib_cache_gid_parse_type_str);
/* This function expects that rwlock will be write locked in all static void del_roce_gid(struct ib_device *device, u8 port_num,
* scenarios and that lock will be locked in sleep-able (RoCE) struct ib_gid_table *table, int ix)
* scenarios.
*/
static int write_gid(struct ib_device *ib_dev, u8 port,
struct ib_gid_table *table, int ix,
const union ib_gid *gid,
const struct ib_gid_attr *attr,
enum gid_table_write_action action,
bool default_gid)
__releases(&table->rwlock) __acquires(&table->rwlock)
{ {
pr_debug("%s device=%s port=%d index=%d gid %pI6\n", __func__,
device->name, port_num, ix,
table->data_vec[ix].gid.raw);
if (rdma_cap_roce_gid_table(device, port_num))
device->del_gid(device, port_num, ix,
&table->data_vec[ix].context);
dev_put(table->data_vec[ix].attr.ndev);
}
static int add_roce_gid(struct ib_gid_table *table,
const union ib_gid *gid,
const struct ib_gid_attr *attr)
{
struct ib_gid_table_entry *entry;
int ix = attr->index;
int ret = 0; int ret = 0;
struct net_device *old_net_dev;
enum ib_gid_type old_gid_type;
/* in rdma_cap_roce_gid_table, this funciton should be protected by a if (!attr->ndev) {
* sleep-able lock. pr_err("%s NULL netdev device=%s port=%d index=%d\n",
*/ __func__, attr->device->name, attr->port_num,
attr->index);
if (rdma_cap_roce_gid_table(ib_dev, port)) { return -EINVAL;
table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
write_unlock_irq(&table->rwlock);
/* GID_TABLE_WRITE_ACTION_MODIFY currently isn't supported by
* RoCE providers and thus only updates the cache.
*/
if (action == GID_TABLE_WRITE_ACTION_ADD)
ret = ib_dev->add_gid(ib_dev, port, ix, gid, attr,
&table->data_vec[ix].context);
else if (action == GID_TABLE_WRITE_ACTION_DEL)
ret = ib_dev->del_gid(ib_dev, port, ix,
&table->data_vec[ix].context);
write_lock_irq(&table->rwlock);
} }
old_net_dev = table->data_vec[ix].attr.ndev; entry = &table->data_vec[ix];
old_gid_type = table->data_vec[ix].attr.gid_type; if ((entry->props & GID_TABLE_ENTRY_INVALID) == 0) {
if (old_net_dev && old_net_dev != attr->ndev) WARN(1, "GID table corruption device=%s port=%d index=%d\n",
dev_put(old_net_dev); attr->device->name, attr->port_num,
/* if modify_gid failed, just delete the old gid */ attr->index);
if (ret || action == GID_TABLE_WRITE_ACTION_DEL) { return -EINVAL;
gid = &zgid;
attr = &zattr;
table->data_vec[ix].context = NULL;
} }
memcpy(&table->data_vec[ix].gid, gid, sizeof(*gid)); if (rdma_cap_roce_gid_table(attr->device, attr->port_num)) {
memcpy(&table->data_vec[ix].attr, attr, sizeof(*attr)); ret = attr->device->add_gid(attr->device, attr->port_num,
if (default_gid) { ix, gid, attr, &entry->context);
table->data_vec[ix].props |= GID_TABLE_ENTRY_DEFAULT; if (ret) {
if (action == GID_TABLE_WRITE_ACTION_DEL) pr_err("%s GID add failed device=%s port=%d index=%d\n",
table->data_vec[ix].attr.gid_type = old_gid_type; __func__, attr->device->name, attr->port_num,
attr->index);
goto add_err;
}
} }
if (table->data_vec[ix].attr.ndev && dev_hold(attr->ndev);
table->data_vec[ix].attr.ndev != old_net_dev)
dev_hold(table->data_vec[ix].attr.ndev);
table->data_vec[ix].props &= ~GID_TABLE_ENTRY_INVALID;
add_err:
if (!ret)
pr_debug("%s device=%s port=%d index=%d gid %pI6\n", __func__,
attr->device->name, attr->port_num, ix, gid->raw);
return ret; return ret;
} }
static int add_gid(struct ib_device *ib_dev, u8 port, /**
struct ib_gid_table *table, int ix, * add_modify_gid - Add or modify GID table entry
const union ib_gid *gid, *
const struct ib_gid_attr *attr, * @table: GID table in which GID to be added or modified
bool default_gid) { * @gid: GID content
return write_gid(ib_dev, port, table, ix, gid, attr, * @attr: Attributes of the GID
GID_TABLE_WRITE_ACTION_ADD, default_gid); *
* Returns 0 on success or appropriate error code. It accepts zero
* GID addition for non RoCE ports for HCA's who report them as valid
* GID. However such zero GIDs are not added to the cache.
*/
static int add_modify_gid(struct ib_gid_table *table,
const union ib_gid *gid,
const struct ib_gid_attr *attr)
{
int ret;
if (rdma_protocol_roce(attr->device, attr->port_num)) {
ret = add_roce_gid(table, gid, attr);
if (ret)
return ret;
} else {
/*
* Some HCA's report multiple GID entries with only one
* valid GID, but remaining as zero GID.
* So ignore such behavior for IB link layer and don't
* fail the call, but don't add such entry to GID cache.
*/
if (!memcmp(gid, &zgid, sizeof(*gid)))
return 0;
}
lockdep_assert_held(&table->lock);
memcpy(&table->data_vec[attr->index].gid, gid, sizeof(*gid));
memcpy(&table->data_vec[attr->index].attr, attr, sizeof(*attr));
write_lock_irq(&table->rwlock);
table->data_vec[attr->index].props &= ~GID_TABLE_ENTRY_INVALID;
write_unlock_irq(&table->rwlock);
return 0;
} }
static int modify_gid(struct ib_device *ib_dev, u8 port, /**
struct ib_gid_table *table, int ix, * del_gid - Delete GID table entry
const union ib_gid *gid, *
const struct ib_gid_attr *attr, * @ib_dev: IB device whose GID entry to be deleted
bool default_gid) { * @port: Port number of the IB device
return write_gid(ib_dev, port, table, ix, gid, attr, * @table: GID table of the IB device for a port
GID_TABLE_WRITE_ACTION_MODIFY, default_gid); * @ix: GID entry index to delete
*
*/
static void del_gid(struct ib_device *ib_dev, u8 port,
struct ib_gid_table *table, int ix)
{
lockdep_assert_held(&table->lock);
write_lock_irq(&table->rwlock);
table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
write_unlock_irq(&table->rwlock);
if (rdma_protocol_roce(ib_dev, port))
del_roce_gid(ib_dev, port, table, ix);
memcpy(&table->data_vec[ix].gid, &zgid, sizeof(zgid));
memset(&table->data_vec[ix].attr, 0, sizeof(table->data_vec[ix].attr));
table->data_vec[ix].context = NULL;
} }
static int del_gid(struct ib_device *ib_dev, u8 port, /* rwlock should be read locked, or lock should be held */
struct ib_gid_table *table, int ix,
bool default_gid) {
return write_gid(ib_dev, port, table, ix, &zgid, &zattr,
GID_TABLE_WRITE_ACTION_DEL, default_gid);
}
/* rwlock should be read locked */
static int find_gid(struct ib_gid_table *table, const union ib_gid *gid, static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
const struct ib_gid_attr *val, bool default_gid, const struct ib_gid_attr *val, bool default_gid,
unsigned long mask, int *pempty) unsigned long mask, int *pempty)
@ -266,15 +286,32 @@ static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
i++; i++;
/* find_gid() is used during GID addition where it is expected
* to return a free entry slot which is not duplicate.
* Free entry slot is requested and returned if pempty is set,
* so lookup free slot only if requested.
*/
if (pempty && empty < 0) {
if (data->props & GID_TABLE_ENTRY_INVALID) {
/* Found an invalid (free) entry; allocate it */
if (data->props & GID_TABLE_ENTRY_DEFAULT) {
if (default_gid)
empty = curr_index;
} else {
empty = curr_index;
}
}
}
/*
* Additionally find_gid() is used to find valid entry during
* lookup operation, where validity needs to be checked. So
* find the empty entry first to continue to search for a free
* slot and ignore its INVALID flag.
*/
if (data->props & GID_TABLE_ENTRY_INVALID) if (data->props & GID_TABLE_ENTRY_INVALID)
continue; continue;
if (empty < 0)
if (!memcmp(&data->gid, &zgid, sizeof(*gid)) &&
!memcmp(attr, &zattr, sizeof(*attr)) &&
!data->props)
empty = curr_index;
if (found >= 0) if (found >= 0)
continue; continue;
@ -310,19 +347,55 @@ static void make_default_gid(struct net_device *dev, union ib_gid *gid)
addrconf_ifid_eui48(&gid->raw[8], dev); addrconf_ifid_eui48(&gid->raw[8], dev);
} }
int ib_cache_gid_add(struct ib_device *ib_dev, u8 port, static int __ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
union ib_gid *gid, struct ib_gid_attr *attr) union ib_gid *gid, struct ib_gid_attr *attr,
unsigned long mask, bool default_gid)
{ {
struct ib_gid_table *table; struct ib_gid_table *table;
int ix;
int ret = 0; int ret = 0;
struct net_device *idev;
int empty; int empty;
int ix;
/* Do not allow adding zero GID in support of
* IB spec version 1.3 section 4.1.1 point (6) and
* section 12.7.10 and section 12.7.20
*/
if (!memcmp(gid, &zgid, sizeof(*gid)))
return -EINVAL;
table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid; table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
if (!memcmp(gid, &zgid, sizeof(*gid))) mutex_lock(&table->lock);
return -EINVAL;
ix = find_gid(table, gid, attr, default_gid, mask, &empty);
if (ix >= 0)
goto out_unlock;
if (empty < 0) {
ret = -ENOSPC;
goto out_unlock;
}
attr->device = ib_dev;
attr->index = empty;
attr->port_num = port;
ret = add_modify_gid(table, gid, attr);
if (!ret)
dispatch_gid_change_event(ib_dev, port);
out_unlock:
mutex_unlock(&table->lock);
if (ret)
pr_warn("%s: unable to add gid %pI6 error=%d\n",
__func__, gid->raw, ret);
return ret;
}
int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
union ib_gid *gid, struct ib_gid_attr *attr)
{
struct net_device *idev;
unsigned long mask;
int ret;
if (ib_dev->get_netdev) { if (ib_dev->get_netdev) {
idev = ib_dev->get_netdev(ib_dev, port); idev = ib_dev->get_netdev(ib_dev, port);
@ -340,27 +413,11 @@ int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
dev_put(idev); dev_put(idev);
} }
mutex_lock(&table->lock); mask = GID_ATTR_FIND_MASK_GID |
write_lock_irq(&table->rwlock); GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_NETDEV;
ix = find_gid(table, gid, attr, false, GID_ATTR_FIND_MASK_GID | ret = __ib_cache_gid_add(ib_dev, port, gid, attr, mask, false);
GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_NETDEV, &empty);
if (ix >= 0)
goto out_unlock;
if (empty < 0) {
ret = -ENOSPC;
goto out_unlock;
}
ret = add_gid(ib_dev, port, table, empty, gid, attr, false);
if (!ret)
dispatch_gid_change_event(ib_dev, port);
out_unlock:
write_unlock_irq(&table->rwlock);
mutex_unlock(&table->lock);
return ret; return ret;
} }
@ -368,29 +425,32 @@ int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
union ib_gid *gid, struct ib_gid_attr *attr) union ib_gid *gid, struct ib_gid_attr *attr)
{ {
struct ib_gid_table *table; struct ib_gid_table *table;
int ret = 0;
int ix; int ix;
table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid; table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
mutex_lock(&table->lock); mutex_lock(&table->lock);
write_lock_irq(&table->rwlock);
ix = find_gid(table, gid, attr, false, ix = find_gid(table, gid, attr, false,
GID_ATTR_FIND_MASK_GID | GID_ATTR_FIND_MASK_GID |
GID_ATTR_FIND_MASK_GID_TYPE | GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_NETDEV | GID_ATTR_FIND_MASK_NETDEV,
GID_ATTR_FIND_MASK_DEFAULT,
NULL); NULL);
if (ix < 0) if (ix < 0) {
ret = -EINVAL;
goto out_unlock; goto out_unlock;
}
if (!del_gid(ib_dev, port, table, ix, false)) del_gid(ib_dev, port, table, ix);
dispatch_gid_change_event(ib_dev, port); dispatch_gid_change_event(ib_dev, port);
out_unlock: out_unlock:
write_unlock_irq(&table->rwlock);
mutex_unlock(&table->lock); mutex_unlock(&table->lock);
return 0; if (ret)
pr_debug("%s: can't delete gid %pI6 error=%d\n",
__func__, gid->raw, ret);
return ret;
} }
int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port, int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
@ -403,16 +463,14 @@ int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid; table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
mutex_lock(&table->lock); mutex_lock(&table->lock);
write_lock_irq(&table->rwlock);
for (ix = 0; ix < table->sz; ix++) for (ix = 0; ix < table->sz; ix++) {
if (table->data_vec[ix].attr.ndev == ndev) if (table->data_vec[ix].attr.ndev == ndev) {
if (!del_gid(ib_dev, port, table, ix, del_gid(ib_dev, port, table, ix);
!!(table->data_vec[ix].props & deleted = true;
GID_TABLE_ENTRY_DEFAULT))) }
deleted = true; }
write_unlock_irq(&table->rwlock);
mutex_unlock(&table->lock); mutex_unlock(&table->lock);
if (deleted) if (deleted)
@ -609,6 +667,7 @@ static struct ib_gid_table *alloc_gid_table(int sz)
{ {
struct ib_gid_table *table = struct ib_gid_table *table =
kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL); kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL);
int i;
if (!table) if (!table)
return NULL; return NULL;
@ -622,6 +681,11 @@ static struct ib_gid_table *alloc_gid_table(int sz)
table->sz = sz; table->sz = sz;
rwlock_init(&table->rwlock); rwlock_init(&table->rwlock);
/* Mark all entries as invalid so that allocator can allocate
* one of the invalid (free) entry.
*/
for (i = 0; i < sz; i++)
table->data_vec[i].props |= GID_TABLE_ENTRY_INVALID;
return table; return table;
err_free_table: err_free_table:
@ -646,16 +710,15 @@ static void cleanup_gid_table_port(struct ib_device *ib_dev, u8 port,
if (!table) if (!table)
return; return;
write_lock_irq(&table->rwlock); mutex_lock(&table->lock);
for (i = 0; i < table->sz; ++i) { for (i = 0; i < table->sz; ++i) {
if (memcmp(&table->data_vec[i].gid, &zgid, if (memcmp(&table->data_vec[i].gid, &zgid,
sizeof(table->data_vec[i].gid))) sizeof(table->data_vec[i].gid))) {
if (!del_gid(ib_dev, port, table, i, del_gid(ib_dev, port, table, i);
table->data_vec[i].props & deleted = true;
GID_ATTR_FIND_MASK_DEFAULT)) }
deleted = true;
} }
write_unlock_irq(&table->rwlock); mutex_unlock(&table->lock);
if (deleted) if (deleted)
dispatch_gid_change_event(ib_dev, port); dispatch_gid_change_event(ib_dev, port);
@ -668,9 +731,9 @@ void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
{ {
union ib_gid gid; union ib_gid gid;
struct ib_gid_attr gid_attr; struct ib_gid_attr gid_attr;
struct ib_gid_attr zattr_type = zattr;
struct ib_gid_table *table; struct ib_gid_table *table;
unsigned int gid_type; unsigned int gid_type;
unsigned long mask;
table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid; table = ib_dev->cache.ports[port - rdma_start_port(ib_dev)].gid;
@ -679,60 +742,19 @@ void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
gid_attr.ndev = ndev; gid_attr.ndev = ndev;
for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) { for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
int ix;
union ib_gid current_gid;
struct ib_gid_attr current_gid_attr = {};
if (1UL << gid_type & ~gid_type_mask) if (1UL << gid_type & ~gid_type_mask)
continue; continue;
gid_attr.gid_type = gid_type; gid_attr.gid_type = gid_type;
mutex_lock(&table->lock);
write_lock_irq(&table->rwlock);
ix = find_gid(table, NULL, &gid_attr, true,
GID_ATTR_FIND_MASK_GID_TYPE |
GID_ATTR_FIND_MASK_DEFAULT,
NULL);
/* Coudn't find default GID location */
if (WARN_ON(ix < 0))
goto release;
zattr_type.gid_type = gid_type;
if (!__ib_cache_gid_get(ib_dev, port, ix,
&current_gid, &current_gid_attr) &&
mode == IB_CACHE_GID_DEFAULT_MODE_SET &&
!memcmp(&gid, &current_gid, sizeof(gid)) &&
!memcmp(&gid_attr, &current_gid_attr, sizeof(gid_attr)))
goto release;
if (memcmp(&current_gid, &zgid, sizeof(current_gid)) ||
memcmp(&current_gid_attr, &zattr_type,
sizeof(current_gid_attr))) {
if (del_gid(ib_dev, port, table, ix, true)) {
pr_warn("ib_cache_gid: can't delete index %d for default gid %pI6\n",
ix, gid.raw);
goto release;
} else {
dispatch_gid_change_event(ib_dev, port);
}
}
if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) { if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
if (add_gid(ib_dev, port, table, ix, &gid, &gid_attr, true)) mask = GID_ATTR_FIND_MASK_GID_TYPE |
pr_warn("ib_cache_gid: unable to add default gid %pI6\n", GID_ATTR_FIND_MASK_DEFAULT;
gid.raw); __ib_cache_gid_add(ib_dev, port, &gid,
else &gid_attr, mask, true);
dispatch_gid_change_event(ib_dev, port); } else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
ib_cache_gid_del(ib_dev, port, &gid, &gid_attr);
} }
release:
if (current_gid_attr.ndev)
dev_put(current_gid_attr.ndev);
write_unlock_irq(&table->rwlock);
mutex_unlock(&table->lock);
} }
} }
@ -1057,25 +1079,50 @@ int ib_get_cached_port_state(struct ib_device *device,
} }
EXPORT_SYMBOL(ib_get_cached_port_state); EXPORT_SYMBOL(ib_get_cached_port_state);
static int config_non_roce_gid_cache(struct ib_device *device,
u8 port, int gid_tbl_len)
{
struct ib_gid_attr gid_attr = {};
struct ib_gid_table *table;
union ib_gid gid;
int ret = 0;
int i;
gid_attr.device = device;
gid_attr.port_num = port;
table = device->cache.ports[port - rdma_start_port(device)].gid;
mutex_lock(&table->lock);
for (i = 0; i < gid_tbl_len; ++i) {
if (!device->query_gid)
continue;
ret = device->query_gid(device, port, i, &gid);
if (ret) {
pr_warn("query_gid failed (%d) for %s (index %d)\n",
ret, device->name, i);
goto err;
}
gid_attr.index = i;
add_modify_gid(table, &gid, &gid_attr);
}
err:
mutex_unlock(&table->lock);
return ret;
}
static void ib_cache_update(struct ib_device *device, static void ib_cache_update(struct ib_device *device,
u8 port, u8 port,
bool enforce_security) bool enforce_security)
{ {
struct ib_port_attr *tprops = NULL; struct ib_port_attr *tprops = NULL;
struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache; struct ib_pkey_cache *pkey_cache = NULL, *old_pkey_cache;
struct ib_gid_cache {
int table_len;
union ib_gid table[0];
} *gid_cache = NULL;
int i; int i;
int ret; int ret;
struct ib_gid_table *table; struct ib_gid_table *table;
bool use_roce_gid_table;
if (!rdma_is_port_valid(device, port)) if (!rdma_is_port_valid(device, port))
return; return;
use_roce_gid_table = rdma_protocol_roce(device, port);
table = device->cache.ports[port - rdma_start_port(device)].gid; table = device->cache.ports[port - rdma_start_port(device)].gid;
tprops = kmalloc(sizeof *tprops, GFP_KERNEL); tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
@ -1089,6 +1136,13 @@ static void ib_cache_update(struct ib_device *device,
goto err; goto err;
} }
if (!rdma_protocol_roce(device, port)) {
ret = config_non_roce_gid_cache(device, port,
tprops->gid_tbl_len);
if (ret)
goto err;
}
pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len * pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
sizeof *pkey_cache->table, GFP_KERNEL); sizeof *pkey_cache->table, GFP_KERNEL);
if (!pkey_cache) if (!pkey_cache)
@ -1096,15 +1150,6 @@ static void ib_cache_update(struct ib_device *device,
pkey_cache->table_len = tprops->pkey_tbl_len; pkey_cache->table_len = tprops->pkey_tbl_len;
if (!use_roce_gid_table) {
gid_cache = kmalloc(sizeof(*gid_cache) + tprops->gid_tbl_len *
sizeof(*gid_cache->table), GFP_KERNEL);
if (!gid_cache)
goto err;
gid_cache->table_len = tprops->gid_tbl_len;
}
for (i = 0; i < pkey_cache->table_len; ++i) { for (i = 0; i < pkey_cache->table_len; ++i) {
ret = ib_query_pkey(device, port, i, pkey_cache->table + i); ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
if (ret) { if (ret) {
@ -1114,33 +1159,12 @@ static void ib_cache_update(struct ib_device *device,
} }
} }
if (!use_roce_gid_table) {
for (i = 0; i < gid_cache->table_len; ++i) {
ret = device->query_gid(device, port, i,
gid_cache->table + i);
if (ret) {
pr_warn("ib_query_gid failed (%d) for %s (index %d)\n",
ret, device->name, i);
goto err;
}
}
}
write_lock_irq(&device->cache.lock); write_lock_irq(&device->cache.lock);
old_pkey_cache = device->cache.ports[port - old_pkey_cache = device->cache.ports[port -
rdma_start_port(device)].pkey; rdma_start_port(device)].pkey;
device->cache.ports[port - rdma_start_port(device)].pkey = pkey_cache; device->cache.ports[port - rdma_start_port(device)].pkey = pkey_cache;
if (!use_roce_gid_table) {
write_lock(&table->rwlock);
for (i = 0; i < gid_cache->table_len; i++) {
modify_gid(device, port, table, i, gid_cache->table + i,
&zattr, false);
}
write_unlock(&table->rwlock);
}
device->cache.ports[port - rdma_start_port(device)].lmc = tprops->lmc; device->cache.ports[port - rdma_start_port(device)].lmc = tprops->lmc;
device->cache.ports[port - rdma_start_port(device)].port_state = device->cache.ports[port - rdma_start_port(device)].port_state =
tprops->state; tprops->state;
@ -1154,14 +1178,12 @@ static void ib_cache_update(struct ib_device *device,
port, port,
tprops->subnet_prefix); tprops->subnet_prefix);
kfree(gid_cache);
kfree(old_pkey_cache); kfree(old_pkey_cache);
kfree(tprops); kfree(tprops);
return; return;
err: err:
kfree(pkey_cache); kfree(pkey_cache);
kfree(gid_cache);
kfree(tprops); kfree(tprops);
} }

18
drivers/infiniband/core/sysfs.c
View File

@ -389,14 +389,26 @@ static ssize_t show_port_gid(struct ib_port *p, struct port_attribute *attr,
{ {
struct port_table_attribute *tab_attr = struct port_table_attribute *tab_attr =
container_of(attr, struct port_table_attribute, attr); container_of(attr, struct port_table_attribute, attr);
union ib_gid *pgid;
union ib_gid gid; union ib_gid gid;
ssize_t ret; ssize_t ret;
ret = ib_query_gid(p->ibdev, p->port_num, tab_attr->index, &gid, NULL); ret = ib_query_gid(p->ibdev, p->port_num, tab_attr->index, &gid, NULL);
if (ret)
return ret;
return sprintf(buf, "%pI6\n", gid.raw); /* If reading GID fails, it is likely due to GID entry being empty
* (invalid) or reserved GID in the table.
* User space expects to read GID table entries as long as it given
* index is within GID table size.
* Administrative/debugging tool fails to query rest of the GID entries
* if it hits error while querying a GID of the given index.
* To avoid user space throwing such error on fail to read gid, return
* zero GID as before. This maintains backward compatibility.
*/
if (ret)
pgid = &zgid;
else
pgid = &gid;
return sprintf(buf, "%pI6\n", pgid->raw);
} }
static ssize_t show_port_gid_attr_ndev(struct ib_port *p, static ssize_t show_port_gid_attr_ndev(struct ib_port *p,

5
include/rdma/ib_verbs.h
View File

@ -91,8 +91,11 @@ enum ib_gid_type {
#define ROCE_V2_UDP_DPORT 4791 #define ROCE_V2_UDP_DPORT 4791
struct ib_gid_attr { struct ib_gid_attr {
enum ib_gid_type gid_type;
struct net_device *ndev; struct net_device *ndev;
struct ib_device *device;
enum ib_gid_type gid_type;
u16 index;
u8 port_num;
}; };
enum rdma_node_type { enum rdma_node_type {