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net/mlx5: Use newer affinity descriptor
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Use the more refined struct irq_affinity_desc to describe the required
IRQ affinity. For the async IRQs request unmanaged affinity and for
completion queues use managed affinity.

No functionality changes introduced. It will be used in a subsequent
patch when we use dynamic MSIX allocation.

Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
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Eli Cohen authored and Saeed Mahameed committed Mar 24, 2023
1 parent 235a25f commit bbac70c
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Showing 4 changed files with 44 additions and 52 deletions.
39 changes: 17 additions & 22 deletions drivers/net/ethernet/mellanox/mlx5/core/irq_affinity.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -45,30 +45,27 @@ static int cpu_get_least_loaded(struct mlx5_irq_pool *pool,

/* Creating an IRQ from irq_pool */
static struct mlx5_irq *
irq_pool_request_irq(struct mlx5_irq_pool *pool, const struct cpumask *req_mask)
irq_pool_request_irq(struct mlx5_irq_pool *pool, struct irq_affinity_desc *af_desc)
{
cpumask_var_t auto_mask;
struct mlx5_irq *irq;
struct irq_affinity_desc auto_desc = {};
u32 irq_index;
int err;

if (!zalloc_cpumask_var(&auto_mask, GFP_KERNEL))
return ERR_PTR(-ENOMEM);
err = xa_alloc(&pool->irqs, &irq_index, NULL, pool->xa_num_irqs, GFP_KERNEL);
if (err)
return ERR_PTR(err);
if (pool->irqs_per_cpu) {
if (cpumask_weight(req_mask) > 1)
if (cpumask_weight(&af_desc->mask) > 1)
/* if req_mask contain more then one CPU, set the least loadad CPU
* of req_mask
*/
cpumask_set_cpu(cpu_get_least_loaded(pool, req_mask), auto_mask);
cpumask_set_cpu(cpu_get_least_loaded(pool, &af_desc->mask),
&auto_desc.mask);
else
cpu_get(pool, cpumask_first(req_mask));
cpu_get(pool, cpumask_first(&af_desc->mask));
}
irq = mlx5_irq_alloc(pool, irq_index, cpumask_empty(auto_mask) ? req_mask : auto_mask);
free_cpumask_var(auto_mask);
return irq;
return mlx5_irq_alloc(pool, irq_index,
cpumask_empty(&auto_desc.mask) ? af_desc : &auto_desc);
}

/* Looking for the IRQ with the smallest refcount that fits req_mask.
Expand Down Expand Up @@ -115,22 +112,22 @@ irq_pool_find_least_loaded(struct mlx5_irq_pool *pool, const struct cpumask *req
/**
* mlx5_irq_affinity_request - request an IRQ according to the given mask.
* @pool: IRQ pool to request from.
* @req_mask: cpumask requested for this IRQ.
* @af_desc: affinity descriptor for this IRQ.
*
* This function returns a pointer to IRQ, or ERR_PTR in case of error.
*/
struct mlx5_irq *
mlx5_irq_affinity_request(struct mlx5_irq_pool *pool, const struct cpumask *req_mask)
mlx5_irq_affinity_request(struct mlx5_irq_pool *pool, struct irq_affinity_desc *af_desc)
{
struct mlx5_irq *least_loaded_irq, *new_irq;

mutex_lock(&pool->lock);
least_loaded_irq = irq_pool_find_least_loaded(pool, req_mask);
least_loaded_irq = irq_pool_find_least_loaded(pool, &af_desc->mask);
if (least_loaded_irq &&
mlx5_irq_read_locked(least_loaded_irq) < pool->min_threshold)
goto out;
/* We didn't find an IRQ with less than min_thres, try to allocate a new IRQ */
new_irq = irq_pool_request_irq(pool, req_mask);
new_irq = irq_pool_request_irq(pool, af_desc);
if (IS_ERR(new_irq)) {
if (!least_loaded_irq) {
/* We failed to create an IRQ and we didn't find an IRQ */
Expand Down Expand Up @@ -194,16 +191,15 @@ int mlx5_irq_affinity_irqs_request_auto(struct mlx5_core_dev *dev, int nirqs,
struct mlx5_irq **irqs)
{
struct mlx5_irq_pool *pool = mlx5_irq_pool_get(dev);
cpumask_var_t req_mask;
struct irq_affinity_desc af_desc = {};
struct mlx5_irq *irq;
int i = 0;

if (!zalloc_cpumask_var(&req_mask, GFP_KERNEL))
return -ENOMEM;
cpumask_copy(req_mask, cpu_online_mask);
af_desc.is_managed = 1;
cpumask_copy(&af_desc.mask, cpu_online_mask);
for (i = 0; i < nirqs; i++) {
if (mlx5_irq_pool_is_sf_pool(pool))
irq = mlx5_irq_affinity_request(pool, req_mask);
irq = mlx5_irq_affinity_request(pool, &af_desc);
else
/* In case SF pool doesn't exists, fallback to the PF IRQs.
* The PF IRQs are already allocated and binded to CPU
Expand All @@ -213,13 +209,12 @@ int mlx5_irq_affinity_irqs_request_auto(struct mlx5_core_dev *dev, int nirqs,
if (IS_ERR(irq))
break;
irqs[i] = irq;
cpumask_clear_cpu(cpumask_first(mlx5_irq_get_affinity_mask(irq)), req_mask);
cpumask_clear_cpu(cpumask_first(mlx5_irq_get_affinity_mask(irq)), &af_desc.mask);
mlx5_core_dbg(pool->dev, "IRQ %u mapped to cpu %*pbl, %u EQs on this irq\n",
pci_irq_vector(dev->pdev, mlx5_irq_get_index(irq)),
cpumask_pr_args(mlx5_irq_get_affinity_mask(irq)),
mlx5_irq_read_locked(irq) / MLX5_EQ_REFS_PER_IRQ);
}
free_cpumask_var(req_mask);
if (!i)
return PTR_ERR(irq);
return i;
Expand Down
6 changes: 3 additions & 3 deletions drivers/net/ethernet/mellanox/mlx5/core/mlx5_irq.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ int mlx5_get_default_msix_vec_count(struct mlx5_core_dev *dev, int num_vfs);
struct mlx5_irq *mlx5_ctrl_irq_request(struct mlx5_core_dev *dev);
void mlx5_ctrl_irq_release(struct mlx5_irq *ctrl_irq);
struct mlx5_irq *mlx5_irq_request(struct mlx5_core_dev *dev, u16 vecidx,
struct cpumask *affinity);
struct irq_affinity_desc *af_desc);
int mlx5_irqs_request_vectors(struct mlx5_core_dev *dev, u16 *cpus, int nirqs,
struct mlx5_irq **irqs);
void mlx5_irqs_release_vectors(struct mlx5_irq **irqs, int nirqs);
Expand All @@ -39,7 +39,7 @@ struct mlx5_irq_pool;
int mlx5_irq_affinity_irqs_request_auto(struct mlx5_core_dev *dev, int nirqs,
struct mlx5_irq **irqs);
struct mlx5_irq *mlx5_irq_affinity_request(struct mlx5_irq_pool *pool,
const struct cpumask *req_mask);
struct irq_affinity_desc *af_desc);
void mlx5_irq_affinity_irqs_release(struct mlx5_core_dev *dev, struct mlx5_irq **irqs,
int num_irqs);
#else
Expand All @@ -50,7 +50,7 @@ static inline int mlx5_irq_affinity_irqs_request_auto(struct mlx5_core_dev *dev,
}

static inline struct mlx5_irq *
mlx5_irq_affinity_request(struct mlx5_irq_pool *pool, const struct cpumask *req_mask)
mlx5_irq_affinity_request(struct mlx5_irq_pool *pool, struct irq_affinity_desc *af_desc)
{
return ERR_PTR(-EOPNOTSUPP);
}
Expand Down
49 changes: 23 additions & 26 deletions drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -206,7 +206,7 @@ static void irq_set_name(struct mlx5_irq_pool *pool, char *name, int vecidx)
}

struct mlx5_irq *mlx5_irq_alloc(struct mlx5_irq_pool *pool, int i,
const struct cpumask *affinity)
struct irq_affinity_desc *af_desc)
{
struct mlx5_core_dev *dev = pool->dev;
char name[MLX5_MAX_IRQ_NAME];
Expand Down Expand Up @@ -235,8 +235,8 @@ struct mlx5_irq *mlx5_irq_alloc(struct mlx5_irq_pool *pool, int i,
err = -ENOMEM;
goto err_cpumask;
}
if (affinity) {
cpumask_copy(irq->mask, affinity);
if (af_desc) {
cpumask_copy(irq->mask, &af_desc->mask);
irq_set_affinity_and_hint(irq->map.virq, irq->mask);
}
irq->pool = pool;
Expand All @@ -250,7 +250,8 @@ struct mlx5_irq *mlx5_irq_alloc(struct mlx5_irq_pool *pool, int i,
}
return irq;
err_xa:
irq_update_affinity_hint(irq->map.virq, NULL);
if (af_desc)
irq_update_affinity_hint(irq->map.virq, NULL);
free_cpumask_var(irq->mask);
err_cpumask:
free_irq(irq->map.virq, &irq->nh);
Expand Down Expand Up @@ -299,7 +300,7 @@ int mlx5_irq_get_index(struct mlx5_irq *irq)
/* requesting an irq from a given pool according to given index */
static struct mlx5_irq *
irq_pool_request_vector(struct mlx5_irq_pool *pool, int vecidx,
struct cpumask *affinity)
struct irq_affinity_desc *af_desc)
{
struct mlx5_irq *irq;

Expand All @@ -309,7 +310,7 @@ irq_pool_request_vector(struct mlx5_irq_pool *pool, int vecidx,
mlx5_irq_get_locked(irq);
goto unlock;
}
irq = mlx5_irq_alloc(pool, vecidx, affinity);
irq = mlx5_irq_alloc(pool, vecidx, af_desc);
unlock:
mutex_unlock(&pool->lock);
return irq;
Expand Down Expand Up @@ -386,28 +387,26 @@ void mlx5_ctrl_irq_release(struct mlx5_irq *ctrl_irq)
struct mlx5_irq *mlx5_ctrl_irq_request(struct mlx5_core_dev *dev)
{
struct mlx5_irq_pool *pool = ctrl_irq_pool_get(dev);
cpumask_var_t req_mask;
struct irq_affinity_desc af_desc;
struct mlx5_irq *irq;

if (!zalloc_cpumask_var(&req_mask, GFP_KERNEL))
return ERR_PTR(-ENOMEM);
cpumask_copy(req_mask, cpu_online_mask);
cpumask_copy(&af_desc.mask, cpu_online_mask);
af_desc.is_managed = false;
if (!mlx5_irq_pool_is_sf_pool(pool)) {
/* In case we are allocating a control IRQ from a pci device's pool.
* This can happen also for a SF if the SFs pool is empty.
*/
if (!pool->xa_num_irqs.max) {
cpumask_clear(req_mask);
cpumask_clear(&af_desc.mask);
/* In case we only have a single IRQ for PF/VF */
cpumask_set_cpu(cpumask_first(cpu_online_mask), req_mask);
cpumask_set_cpu(cpumask_first(cpu_online_mask), &af_desc.mask);
}
/* Allocate the IRQ in the last index of the pool */
irq = irq_pool_request_vector(pool, pool->xa_num_irqs.max, req_mask);
irq = irq_pool_request_vector(pool, pool->xa_num_irqs.max, &af_desc);
} else {
irq = mlx5_irq_affinity_request(pool, req_mask);
irq = mlx5_irq_affinity_request(pool, &af_desc);
}

free_cpumask_var(req_mask);
return irq;
}

Expand All @@ -416,23 +415,23 @@ struct mlx5_irq *mlx5_ctrl_irq_request(struct mlx5_core_dev *dev)
* @dev: mlx5 device that requesting the IRQ.
* @vecidx: vector index of the IRQ. This argument is ignore if affinity is
* provided.
* @affinity: cpumask requested for this IRQ.
* @af_desc: affinity descriptor for this IRQ.
*
* This function returns a pointer to IRQ, or ERR_PTR in case of error.
*/
struct mlx5_irq *mlx5_irq_request(struct mlx5_core_dev *dev, u16 vecidx,
struct cpumask *affinity)
struct irq_affinity_desc *af_desc)
{
struct mlx5_irq_table *irq_table = mlx5_irq_table_get(dev);
struct mlx5_irq_pool *pool;
struct mlx5_irq *irq;

pool = irq_table->pf_pool;
irq = irq_pool_request_vector(pool, vecidx, affinity);
irq = irq_pool_request_vector(pool, vecidx, af_desc);
if (IS_ERR(irq))
return irq;
mlx5_core_dbg(dev, "irq %u mapped to cpu %*pbl, %u EQs on this irq\n",
irq->map.virq, cpumask_pr_args(affinity),
irq->map.virq, cpumask_pr_args(&af_desc->mask),
irq->refcount / MLX5_EQ_REFS_PER_IRQ);
return irq;
}
Expand Down Expand Up @@ -463,22 +462,20 @@ void mlx5_irqs_release_vectors(struct mlx5_irq **irqs, int nirqs)
int mlx5_irqs_request_vectors(struct mlx5_core_dev *dev, u16 *cpus, int nirqs,
struct mlx5_irq **irqs)
{
cpumask_var_t req_mask;
struct irq_affinity_desc af_desc;
struct mlx5_irq *irq;
int i;

if (!zalloc_cpumask_var(&req_mask, GFP_KERNEL))
return -ENOMEM;
af_desc.is_managed = 1;
for (i = 0; i < nirqs; i++) {
cpumask_set_cpu(cpus[i], req_mask);
irq = mlx5_irq_request(dev, i, req_mask);
cpumask_set_cpu(cpus[i], &af_desc.mask);
irq = mlx5_irq_request(dev, i, &af_desc);
if (IS_ERR(irq))
break;
cpumask_clear(req_mask);
cpumask_clear(&af_desc.mask);
irqs[i] = irq;
}

free_cpumask_var(req_mask);
return i ? i : PTR_ERR(irq);
}

Expand Down
2 changes: 1 addition & 1 deletion drivers/net/ethernet/mellanox/mlx5/core/pci_irq.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ static inline bool mlx5_irq_pool_is_sf_pool(struct mlx5_irq_pool *pool)
}

struct mlx5_irq *mlx5_irq_alloc(struct mlx5_irq_pool *pool, int i,
const struct cpumask *affinity);
struct irq_affinity_desc *af_desc);
int mlx5_irq_get_locked(struct mlx5_irq *irq);
int mlx5_irq_read_locked(struct mlx5_irq *irq);
int mlx5_irq_put(struct mlx5_irq *irq);
Expand Down

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