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net/mlx4_core: Implement resource quota enforcement

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Implements resource quota grant decision when resources are requested,
for the following resources:  QPs, CQs, SRQs, MPTs, MTTs, vlans, MACs,
and Counters.

When granting a resource, the quota system increases the allocated-count
for that slave.

When the slave later frees the resource, its allocated-count is reduced.

A spinlock is used to protect the integrity of each resource's free-pool counter.
(One slave may be in the process of being granted a resource while another
slave has crashed, initiating cleanup of that slave's resource quotas).

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jack Morgenstein 2013-11-03 10:03:25 +02:00 committed by David S. Miller
parent eb456a68c6
commit 146f3ef4a1
2 changed files with 174 additions and 14 deletions
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1
drivers/net/ethernet/mellanox/mlx4/mlx4.h
View File

@ -505,6 +505,7 @@ struct slave_list {
};
struct resource_allocator {
spinlock_t alloc_lock; /* protect quotas */
union {
int res_reserved;
int res_port_rsvd[MLX4_MAX_PORTS];

187
drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
View File

@ -284,6 +284,85 @@ static const char *ResourceType(enum mlx4_resource rt)
}
static void rem_slave_vlans(struct mlx4_dev *dev, int slave);
static inline int mlx4_grant_resource(struct mlx4_dev *dev, int slave,
enum mlx4_resource res_type, int count,
int port)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct resource_allocator *res_alloc =
&priv->mfunc.master.res_tracker.res_alloc[res_type];
int err = -EINVAL;
int allocated, free, reserved, guaranteed, from_free;
if (slave > dev->num_vfs)
return -EINVAL;
spin_lock(&res_alloc->alloc_lock);
allocated = (port > 0) ?
res_alloc->allocated[(port - 1) * (dev->num_vfs + 1) + slave] :
res_alloc->allocated[slave];
free = (port > 0) ? res_alloc->res_port_free[port - 1] :
res_alloc->res_free;
reserved = (port > 0) ? res_alloc->res_port_rsvd[port - 1] :
res_alloc->res_reserved;
guaranteed = res_alloc->guaranteed[slave];
if (allocated + count > res_alloc->quota[slave])
goto out;
if (allocated + count <= guaranteed) {
err = 0;
} else {
/* portion may need to be obtained from free area */
if (guaranteed - allocated > 0)
from_free = count - (guaranteed - allocated);
else
from_free = count;
if (free - from_free > reserved)
err = 0;
}
if (!err) {
/* grant the request */
if (port > 0) {
res_alloc->allocated[(port - 1) * (dev->num_vfs + 1) + slave] += count;
res_alloc->res_port_free[port - 1] -= count;
} else {
res_alloc->allocated[slave] += count;
res_alloc->res_free -= count;
}
}
out:
spin_unlock(&res_alloc->alloc_lock);
return err;
}
static inline void mlx4_release_resource(struct mlx4_dev *dev, int slave,
enum mlx4_resource res_type, int count,
int port)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct resource_allocator *res_alloc =
&priv->mfunc.master.res_tracker.res_alloc[res_type];
if (slave > dev->num_vfs)
return;
spin_lock(&res_alloc->alloc_lock);
if (port > 0) {
res_alloc->allocated[(port - 1) * (dev->num_vfs + 1) + slave] -= count;
res_alloc->res_port_free[port - 1] += count;
} else {
res_alloc->allocated[slave] -= count;
res_alloc->res_free += count;
}
spin_unlock(&res_alloc->alloc_lock);
return;
}
static inline void initialize_res_quotas(struct mlx4_dev *dev,
struct resource_allocator *res_alloc,
enum mlx4_resource res_type,
@ -373,6 +452,7 @@ int mlx4_init_resource_tracker(struct mlx4_dev *dev)
!res_alloc->allocated)
goto no_mem_err;
spin_lock_init(&res_alloc->alloc_lock);
for (t = 0; t < dev->num_vfs + 1; t++) {
switch (i) {
case RES_QP:
@ -1399,12 +1479,19 @@ static int qp_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
case RES_OP_RESERVE:
count = get_param_l(&in_param);
align = get_param_h(&in_param);
err = __mlx4_qp_reserve_range(dev, count, align, &base);
err = mlx4_grant_resource(dev, slave, RES_QP, count, 0);
if (err)
return err;
err = __mlx4_qp_reserve_range(dev, count, align, &base);
if (err) {
mlx4_release_resource(dev, slave, RES_QP, count, 0);
return err;
}
err = add_res_range(dev, slave, base, count, RES_QP, 0);
if (err) {
mlx4_release_resource(dev, slave, RES_QP, count, 0);
__mlx4_qp_release_range(dev, base, count);
return err;
}
@ -1452,15 +1539,24 @@ static int mtt_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
return err;
order = get_param_l(&in_param);
err = mlx4_grant_resource(dev, slave, RES_MTT, 1 << order, 0);
if (err)
return err;
base = __mlx4_alloc_mtt_range(dev, order);
if (base == -1)
if (base == -1) {
mlx4_release_resource(dev, slave, RES_MTT, 1 << order, 0);
return -ENOMEM;
}
err = add_res_range(dev, slave, base, 1, RES_MTT, order);
if (err)
if (err) {
mlx4_release_resource(dev, slave, RES_MTT, 1 << order, 0);
__mlx4_free_mtt_range(dev, base, order);
else
} else {
set_param_l(out_param, base);
}
return err;
}
@ -1475,13 +1571,20 @@ static int mpt_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
switch (op) {
case RES_OP_RESERVE:
index = __mlx4_mpt_reserve(dev);
if (index == -1)
err = mlx4_grant_resource(dev, slave, RES_MPT, 1, 0);
if (err)
break;
index = __mlx4_mpt_reserve(dev);
if (index == -1) {
mlx4_release_resource(dev, slave, RES_MPT, 1, 0);
break;
}
id = index & mpt_mask(dev);
err = add_res_range(dev, slave, id, 1, RES_MPT, index);
if (err) {
mlx4_release_resource(dev, slave, RES_MPT, 1, 0);
__mlx4_mpt_release(dev, index);
break;
}
@ -1515,12 +1618,19 @@ static int cq_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
switch (op) {
case RES_OP_RESERVE_AND_MAP:
err = __mlx4_cq_alloc_icm(dev, &cqn);
err = mlx4_grant_resource(dev, slave, RES_CQ, 1, 0);
if (err)
break;
err = __mlx4_cq_alloc_icm(dev, &cqn);
if (err) {
mlx4_release_resource(dev, slave, RES_CQ, 1, 0);
break;
}
err = add_res_range(dev, slave, cqn, 1, RES_CQ, 0);
if (err) {
mlx4_release_resource(dev, slave, RES_CQ, 1, 0);
__mlx4_cq_free_icm(dev, cqn);
break;
}
@ -1543,12 +1653,19 @@ static int srq_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
switch (op) {
case RES_OP_RESERVE_AND_MAP:
err = __mlx4_srq_alloc_icm(dev, &srqn);
err = mlx4_grant_resource(dev, slave, RES_SRQ, 1, 0);
if (err)
break;
err = __mlx4_srq_alloc_icm(dev, &srqn);
if (err) {
mlx4_release_resource(dev, slave, RES_SRQ, 1, 0);
break;
}
err = add_res_range(dev, slave, srqn, 1, RES_SRQ, 0);
if (err) {
mlx4_release_resource(dev, slave, RES_SRQ, 1, 0);
__mlx4_srq_free_icm(dev, srqn);
break;
}
@ -1569,9 +1686,13 @@ static int mac_add_to_slave(struct mlx4_dev *dev, int slave, u64 mac, int port)
struct mlx4_resource_tracker *tracker = &priv->mfunc.master.res_tracker;
struct mac_res *res;
if (mlx4_grant_resource(dev, slave, RES_MAC, 1, port))
return -EINVAL;
res = kzalloc(sizeof *res, GFP_KERNEL);
if (!res)
if (!res) {
mlx4_release_resource(dev, slave, RES_MAC, 1, port);
return -ENOMEM;
}
res->mac = mac;
res->port = (u8) port;
list_add_tail(&res->list,
@ -1591,6 +1712,7 @@ static void mac_del_from_slave(struct mlx4_dev *dev, int slave, u64 mac,
list_for_each_entry_safe(res, tmp, mac_list, list) {
if (res->mac == mac && res->port == (u8) port) {
list_del(&res->list);
mlx4_release_resource(dev, slave, RES_MAC, 1, port);
kfree(res);
break;
}
@ -1608,6 +1730,7 @@ static void rem_slave_macs(struct mlx4_dev *dev, int slave)
list_for_each_entry_safe(res, tmp, mac_list, list) {
list_del(&res->list);
__mlx4_unregister_mac(dev, res->port, res->mac);
mlx4_release_resource(dev, slave, RES_MAC, 1, res->port);
kfree(res);
}
}
@ -1656,9 +1779,13 @@ static int vlan_add_to_slave(struct mlx4_dev *dev, int slave, u16 vlan,
}
}
if (mlx4_grant_resource(dev, slave, RES_VLAN, 1, port))
return -EINVAL;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (!res)
if (!res) {
mlx4_release_resource(dev, slave, RES_VLAN, 1, port);
return -ENOMEM;
}
res->vlan = vlan;
res->port = (u8) port;
res->vlan_index = vlan_index;
@ -1682,6 +1809,8 @@ static void vlan_del_from_slave(struct mlx4_dev *dev, int slave, u16 vlan,
if (res->vlan == vlan && res->port == (u8) port) {
if (!--res->ref_count) {
list_del(&res->list);
mlx4_release_resource(dev, slave, RES_VLAN,
1, port);
kfree(res);
}
break;
@ -1703,6 +1832,7 @@ static void rem_slave_vlans(struct mlx4_dev *dev, int slave)
/* dereference the vlan the num times the slave referenced it */
for (i = 0; i < res->ref_count; i++)
__mlx4_unregister_vlan(dev, res->port, res->vlan);
mlx4_release_resource(dev, slave, RES_VLAN, 1, res->port);
kfree(res);
}
}
@ -1749,15 +1879,23 @@ static int counter_alloc_res(struct mlx4_dev *dev, int slave, int op, int cmd,
if (op != RES_OP_RESERVE)
return -EINVAL;
err = __mlx4_counter_alloc(dev, &index);
err = mlx4_grant_resource(dev, slave, RES_COUNTER, 1, 0);
if (err)
return err;
err = __mlx4_counter_alloc(dev, &index);
if (err) {
mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
return err;
}
err = add_res_range(dev, slave, index, 1, RES_COUNTER, 0);
if (err)
if (err) {
__mlx4_counter_free(dev, index);
else
mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
} else {
set_param_l(out_param, index);
}
return err;
}
@ -1864,6 +2002,7 @@ static int qp_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
err = rem_res_range(dev, slave, base, count, RES_QP, 0);
if (err)
break;
mlx4_release_resource(dev, slave, RES_QP, count, 0);
__mlx4_qp_release_range(dev, base, count);
break;
case RES_OP_MAP_ICM:
@ -1901,8 +2040,10 @@ static int mtt_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
base = get_param_l(&in_param);
order = get_param_h(&in_param);
err = rem_res_range(dev, slave, base, 1, RES_MTT, order);
if (!err)
if (!err) {
mlx4_release_resource(dev, slave, RES_MTT, 1 << order, 0);
__mlx4_free_mtt_range(dev, base, order);
}
return err;
}
@ -1927,6 +2068,7 @@ static int mpt_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
err = rem_res_range(dev, slave, id, 1, RES_MPT, 0);
if (err)
break;
mlx4_release_resource(dev, slave, RES_MPT, 1, 0);
__mlx4_mpt_release(dev, index);
break;
case RES_OP_MAP_ICM:
@ -1961,6 +2103,7 @@ static int cq_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
if (err)
break;
mlx4_release_resource(dev, slave, RES_CQ, 1, 0);
__mlx4_cq_free_icm(dev, cqn);
break;
@ -1985,6 +2128,7 @@ static int srq_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
if (err)
break;
mlx4_release_resource(dev, slave, RES_SRQ, 1, 0);
__mlx4_srq_free_icm(dev, srqn);
break;
@ -2056,6 +2200,7 @@ static int counter_free_res(struct mlx4_dev *dev, int slave, int op, int cmd,
return err;
__mlx4_counter_free(dev, index);
mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
return err;
}
@ -3785,6 +3930,11 @@ static void rem_slave_qps(struct mlx4_dev *dev, int slave)
&tracker->res_tree[RES_QP]);
list_del(&qp->com.list);
spin_unlock_irq(mlx4_tlock(dev));
if (!valid_reserved(dev, slave, qpn)) {
__mlx4_qp_release_range(dev, qpn, 1);
mlx4_release_resource(dev, slave,
RES_QP, 1, 0);
}
kfree(qp);
state = 0;
break;
@ -3856,6 +4006,8 @@ static void rem_slave_srqs(struct mlx4_dev *dev, int slave)
&tracker->res_tree[RES_SRQ]);
list_del(&srq->com.list);
spin_unlock_irq(mlx4_tlock(dev));
mlx4_release_resource(dev, slave,
RES_SRQ, 1, 0);
kfree(srq);
state = 0;
break;
@ -3922,6 +4074,8 @@ static void rem_slave_cqs(struct mlx4_dev *dev, int slave)
&tracker->res_tree[RES_CQ]);
list_del(&cq->com.list);
spin_unlock_irq(mlx4_tlock(dev));
mlx4_release_resource(dev, slave,
RES_CQ, 1, 0);
kfree(cq);
state = 0;
break;
@ -3985,6 +4139,8 @@ static void rem_slave_mrs(struct mlx4_dev *dev, int slave)
&tracker->res_tree[RES_MPT]);
list_del(&mpt->com.list);
spin_unlock_irq(mlx4_tlock(dev));
mlx4_release_resource(dev, slave,
RES_MPT, 1, 0);
kfree(mpt);
state = 0;
break;
@ -4054,6 +4210,8 @@ static void rem_slave_mtts(struct mlx4_dev *dev, int slave)
&tracker->res_tree[RES_MTT]);
list_del(&mtt->com.list);
spin_unlock_irq(mlx4_tlock(dev));
mlx4_release_resource(dev, slave, RES_MTT,
1 << mtt->order, 0);
kfree(mtt);
state = 0;
break;
@ -4212,6 +4370,7 @@ static void rem_slave_counters(struct mlx4_dev *dev, int slave)
list_del(&counter->com.list);
kfree(counter);
__mlx4_counter_free(dev, index);
mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
}
}
spin_unlock_irq(mlx4_tlock(dev));