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net/mlx4: Replace irq_to_desc() abuse

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No driver has any business with the internals of an interrupt
descriptor. Storing a pointer to it just to use yet another helper at the
actual usage site to retrieve the affinity mask is creative at best. Just
because C does not allow encapsulation does not mean that the kernel has no
limits.

Retrieve a pointer to the affinity mask itself and use that. It's still
using an interface which is usually not for random drivers, but definitely
less hideous than the previous hack.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20201210194044.580936243@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-12-10 20:25:56 +01:00
parent b8fecfdfb0
commit 80a62deedf
3 changed files with 6 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/mellanox/mlx4/en_cq.c
View File

@@ -90,7 +90,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
int cq_idx)
{
struct mlx4_en_dev *mdev = priv->mdev;
int err = 0;
int irq, err = 0;
int timestamp_en = 0;
bool assigned_eq = false;
@@ -116,10 +116,8 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq,
assigned_eq = true;
}
cq->irq_desc =
irq_to_desc(mlx4_eq_get_irq(mdev->dev,
cq->vector));
irq = mlx4_eq_get_irq(mdev->dev, cq->vector);
cq->aff_mask = irq_get_affinity_mask(irq);
} else {
/* For TX we use the same irq per
ring we assigned for the RX */

6
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@@ -959,8 +959,6 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
/* If we used up all the quota - we're probably not done yet... */
if (done == budget || !clean_complete) {
const struct cpumask *aff;
struct irq_data *idata;
int cpu_curr;
/* in case we got here because of !clean_complete */
@@ -969,10 +967,8 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
INC_PERF_COUNTER(priv->pstats.napi_quota);
cpu_curr = smp_processor_id();
idata = irq_desc_get_irq_data(cq->irq_desc);
aff = irq_data_get_affinity_mask(idata);
if (likely(cpumask_test_cpu(cpu_curr, aff)))
if (likely(cpumask_test_cpu(cpu_curr, cq->aff_mask)))
return budget;
/* Current cpu is not according to smp_irq_affinity -

3
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@@ -46,6 +46,7 @@
#endif
#include <linux/cpu_rmap.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/irq.h>
#include <net/xdp.h>
#include <linux/mlx4/device.h>
@@ -380,7 +381,7 @@ struct mlx4_en_cq {
struct mlx4_cqe *buf;
#define MLX4_EN_OPCODE_ERROR 0x1e
struct irq_desc *irq_desc;
const struct cpumask *aff_mask;
};
struct mlx4_en_port_profile {