net/mlx5: Initializing CPU reverse mapping

Allocating CPU rmap and add entry for each IRQ.
CPU rmap is used in aRFS to get the RX queue number
of the RX completion interrupts.

Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 518192e..8fee224 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1691,6 +1691,9 @@ int mlx5e_open_locked(struct net_device *netdev)
        mlx5e_redirect_rqts(priv);
        mlx5e_update_carrier(priv);
        mlx5e_timestamp_init(priv);
+#ifdef CONFIG_RFS_ACCEL
+       priv->netdev->rx_cpu_rmap = priv->mdev->rmap;
+#endif
 
        schedule_delayed_work(&priv->update_stats_work, 0);
 

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 6892746..6feef7f 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -48,6 +48,9 @@
 #include <linux/kmod.h>
 #include <linux/delay.h>
 #include <linux/mlx5/mlx5_ifc.h>
+#ifdef CONFIG_RFS_ACCEL
+#include <linux/cpu_rmap.h>
+#endif
 #include "mlx5_core.h"
 #include "fs_core.h"
 #ifdef CONFIG_MLX5_CORE_EN
@@ -665,6 +668,12 @@ static void free_comp_eqs(struct mlx5_core_dev *dev)
        struct mlx5_eq_table *table = &dev->priv.eq_table;
        struct mlx5_eq *eq, *n;
 
+#ifdef CONFIG_RFS_ACCEL
+       if (dev->rmap) {
+               free_irq_cpu_rmap(dev->rmap);
+               dev->rmap = NULL;
+       }
+#endif
        spin_lock(&table->lock);
        list_for_each_entry_safe(eq, n, &table->comp_eqs_list, list) {
                list_del(&eq->list);
@@ -691,6 +700,11 @@ static int alloc_comp_eqs(struct mlx5_core_dev *dev)
        INIT_LIST_HEAD(&table->comp_eqs_list);
        ncomp_vec = table->num_comp_vectors;
        nent = MLX5_COMP_EQ_SIZE;
+#ifdef CONFIG_RFS_ACCEL
+       dev->rmap = alloc_irq_cpu_rmap(ncomp_vec);
+       if (!dev->rmap)
+               return -ENOMEM;
+#endif
        for (i = 0; i < ncomp_vec; i++) {
                eq = kzalloc(sizeof(*eq), GFP_KERNEL);
                if (!eq) {
@@ -698,6 +712,10 @@ static int alloc_comp_eqs(struct mlx5_core_dev *dev)
                        goto clean;
                }
 
+#ifdef CONFIG_RFS_ACCEL
+               irq_cpu_rmap_add(dev->rmap,
+                                dev->priv.msix_arr[i + MLX5_EQ_VEC_COMP_BASE].vector);
+#endif
                snprintf(name, MLX5_MAX_IRQ_NAME, "mlx5_comp%d", i);
                err = mlx5_create_map_eq(dev, eq,
                                         i + MLX5_EQ_VEC_COMP_BASE, nent, 0,

diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 96a428d..d552944 100644 (file)
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -560,6 +560,9 @@ struct mlx5_core_dev {
        struct mlx5_profile     *profile;
        atomic_t                num_qps;
        u32                     issi;
+#ifdef CONFIG_RFS_ACCEL
+       struct cpu_rmap         *rmap;
+#endif
 };
 
 struct mlx5_db {