net/mlx4: Add EQ pool

Previously, mlx4_en allocated EQs and used them exclusively.
This affected RoCE performance, as applications which are
events sensitive were limited to use only the legacy EQs.

Change that by introducing an EQ pool. This pool is managed
by mlx4_core. EQs are assigned to ports (when there are limited
number of EQs, multiple ports could be assigned to the same EQs).

An exception to this rule is the ASYNC EQ which handles various events.

Legacy EQs are completely removed as all EQs could be shared.

When a consumer (mlx4_ib/mlx4_en) requests an EQ, it asks for
EQ serving on a specific port. The core driver calculates which
EQ should be assigned to that request.

Because IRQs are shared between IB and Ethernet modules, their
names only include the PCI device BDF address.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 83e80ab94500..ad31e476873f 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -46,8 +46,9 @@
 
 #define MAX_MSIX_P_PORT         17
 #define MAX_MSIX                64
-#define MSIX_LEGACY_SZ          4
 #define MIN_MSIX_P_PORT         5
+#define MLX4_IS_LEGACY_EQ_MODE(dev_cap) ((dev_cap).num_comp_vectors < \
+                                         (dev_cap).num_ports * MIN_MSIX_P_PORT)
 
 #define MLX4_MAX_100M_UNITS_VAL         255     /*
                                                  * work around: can't set values
@@ -528,7 +529,6 @@ struct mlx4_caps {
         int                     num_eqs;
         int                     reserved_eqs;
         int                     num_comp_vectors;
-        int                     comp_pool;
         int                     num_mpts;
         int                     max_fmr_maps;
         int                     num_mtts;
@@ -1332,10 +1332,13 @@ void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr);
 int mlx4_SYNC_TPT(struct mlx4_dev *dev);
 int mlx4_test_interrupts(struct mlx4_dev *dev);
-int mlx4_assign_eq(struct mlx4_dev *dev, char *name, struct cpu_rmap *rmap,
-                   int *vector);
+u32 mlx4_get_eqs_per_port(struct mlx4_dev *dev, u8 port);
+bool mlx4_is_eq_vector_valid(struct mlx4_dev *dev, u8 port, int vector);
+struct cpu_rmap *mlx4_get_cpu_rmap(struct mlx4_dev *dev, int port);
+int mlx4_assign_eq(struct mlx4_dev *dev, u8 port, int *vector);
 void mlx4_release_eq(struct mlx4_dev *dev, int vec);
 
+int mlx4_is_eq_shared(struct mlx4_dev *dev, int vector);
 int mlx4_eq_get_irq(struct mlx4_dev *dev, int vec);
 
 int mlx4_get_phys_port_id(struct mlx4_dev *dev);