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net/mlx4_core: Enforce irq affinity changes immediatly

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During heavy traffic, napi is constatntly polling the complition queue
and no interrupt is fired. Because of that, changes to irq affinity are
ignored until traffic is stopped and resumed.

By registering to the irq notifier mechanism, and forcing interrupt when
affinity is changed, irq affinity changes will be immediatly enforced.

Signed-off-by: Yuval Atias <yuvala@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Atias 2014-05-14 12:15:10 +03:00 committed by David S. Miller
parent 3763e7ef17
commit 2eacc23c42
5 changed files with 83 additions and 2 deletions
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3
drivers/net/ethernet/mellanox/mlx4/cq.c
View file

@ -293,6 +293,9 @@ int mlx4_cq_alloc(struct mlx4_dev *dev, int nent,
atomic_set(&cq->refcount, 1);
init_completion(&cq->free);
cq->irq = priv->eq_table.eq[cq->vector].irq;
cq->irq_affinity_change = false;
return 0;
err_radix:

11
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View file

@ -895,10 +895,17 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
mlx4_en_cq_unlock_napi(cq);
/* If we used up all the quota - we're probably not done yet... */
if (done == budget)
if (done == budget) {
INC_PERF_COUNTER(priv->pstats.napi_quota);
else {
if (unlikely(cq->mcq.irq_affinity_change)) {
cq->mcq.irq_affinity_change = false;
napi_complete(napi);
mlx4_en_arm_cq(priv, cq);
return 0;
}
} else {
/* Done for now */
cq->mcq.irq_affinity_change = false;
napi_complete(napi);
mlx4_en_arm_cq(priv, cq);
}

6
drivers/net/ethernet/mellanox/mlx4/en_tx.c
View file

@ -474,9 +474,15 @@ int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
/* If we used up all the quota - we're probably not done yet... */
if (done < budget) {
/* Done for now */
cq->mcq.irq_affinity_change = false;
napi_complete(napi);
mlx4_en_arm_cq(priv, cq);
return done;
} else if (unlikely(cq->mcq.irq_affinity_change)) {
cq->mcq.irq_affinity_change = false;
napi_complete(napi);
mlx4_en_arm_cq(priv, cq);
return 0;
}
return budget;
}

62
drivers/net/ethernet/mellanox/mlx4/eq.c
View file

@ -53,6 +53,11 @@ enum {
MLX4_EQ_ENTRY_SIZE = 0x20
};
struct mlx4_irq_notify {
void *arg;
struct irq_affinity_notify notify;
};
#define MLX4_EQ_STATUS_OK ( 0 << 28)
#define MLX4_EQ_STATUS_WRITE_FAIL (10 << 28)
#define MLX4_EQ_OWNER_SW ( 0 << 24)
@ -1083,6 +1088,57 @@ static void mlx4_unmap_clr_int(struct mlx4_dev *dev)
iounmap(priv->clr_base);
}
static void mlx4_irq_notifier_notify(struct irq_affinity_notify *notify,
const cpumask_t *mask)
{
struct mlx4_irq_notify *n = container_of(notify,
struct mlx4_irq_notify,
notify);
struct mlx4_priv *priv = (struct mlx4_priv *)n->arg;
struct radix_tree_iter iter;
void **slot;
radix_tree_for_each_slot(slot, &priv->cq_table.tree, &iter, 0) {
struct mlx4_cq *cq = (struct mlx4_cq *)(*slot);
if (cq->irq == notify->irq)
cq->irq_affinity_change = true;
}
}
static void mlx4_release_irq_notifier(struct kref *ref)
{
struct mlx4_irq_notify *n = container_of(ref, struct mlx4_irq_notify,
notify.kref);
kfree(n);
}
static void mlx4_assign_irq_notifier(struct mlx4_priv *priv,
struct mlx4_dev *dev, int irq)
{
struct mlx4_irq_notify *irq_notifier = NULL;
int err = 0;
irq_notifier = kzalloc(sizeof(*irq_notifier), GFP_KERNEL);
if (!irq_notifier) {
mlx4_warn(dev, "Failed to allocate irq notifier. irq %d\n",
irq);
return;
}
irq_notifier->notify.irq = irq;
irq_notifier->notify.notify = mlx4_irq_notifier_notify;
irq_notifier->notify.release = mlx4_release_irq_notifier;
irq_notifier->arg = priv;
err = irq_set_affinity_notifier(irq, &irq_notifier->notify);
if (err) {
kfree(irq_notifier);
irq_notifier = NULL;
mlx4_warn(dev, "Failed to set irq notifier. irq %d\n", irq);
}
}
int mlx4_alloc_eq_table(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
@ -1353,6 +1409,9 @@ int mlx4_assign_eq(struct mlx4_dev *dev, char *name, struct cpu_rmap *rmap,
continue;
/*we dont want to break here*/
}
mlx4_assign_irq_notifier(priv, dev,
priv->eq_table.eq[vec].irq);
eq_set_ci(&priv->eq_table.eq[vec], 1);
}
}
@ -1379,6 +1438,9 @@ void mlx4_release_eq(struct mlx4_dev *dev, int vec)
Belonging to a legacy EQ*/
mutex_lock(&priv->msix_ctl.pool_lock);
if (priv->msix_ctl.pool_bm & 1ULL << i) {
irq_set_affinity_notifier(
priv->eq_table.eq[vec].irq,
NULL);
free_irq(priv->eq_table.eq[vec].irq,
&priv->eq_table.eq[vec]);
priv->msix_ctl.pool_bm &= ~(1ULL << i);

3
include/linux/mlx4/device.h
View file

@ -577,6 +577,9 @@ struct mlx4_cq {
u32 cons_index;
u16 irq;
bool irq_affinity_change;
__be32 *set_ci_db;
__be32 *arm_db;
int arm_sn;