Merge tag 'mlx5-updates-2018-02-21' of git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux into k.o/wip/dl-for-next

mlx5-updates-2018-02-21

This series includes shared code updates for mlx5 core driver for both
netdev and rdma subsystems.

By Saeed,
First six patches of the series are meant to address a performance issue
and should provide a performance boost for multi core IRQ interrupt hungry
workloads.  The issue is fixed in the first patch, all other patches are
meant to refactor the code in light of this fix.

The problem it comes to fix, is a shared spinlock accessed across all HCA
IRQs which protects the CQ database.  To solve this we simply move the CQ
database and its spinlock to be per EQ (IRQ), thus per core.

By Yonatan,
Fragmented completion queue (CQ) for RDMA,
core driver implementation to create fragmented CQ buffers rather than
one large contiguous memory buffer, the implementation scheme already
exist and used by the netdev CQs, the patch shares that code with the
rdma CQ creation flow and makes use of the new API in mlx5_ib driver.

Thanks,
Saeed.

Merged into rdma-next tree as well as net-next tree to prevent conflicts
in future patches between the two trees.

Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/include/linux/mlx5/cq.h b/include/linux/mlx5/cq.h
index 48c181a2acc9..445ad194e0fe 100644
--- a/include/linux/mlx5/cq.h
+++ b/include/linux/mlx5/cq.h
@@ -60,6 +60,7 @@ struct mlx5_core_cq {
 	} tasklet_ctx;
 	int			reset_notify_added;
 	struct list_head	reset_notify;
+	struct mlx5_eq		*eq;
 };
 
 
@@ -171,8 +172,17 @@ static inline void mlx5_cq_arm(struct mlx5_core_cq *cq, u32 cmd,
 	mlx5_write64(doorbell, uar_page + MLX5_CQ_DOORBELL, NULL);
 }
 
-int mlx5_init_cq_table(struct mlx5_core_dev *dev);
-void mlx5_cleanup_cq_table(struct mlx5_core_dev *dev);
+static inline void mlx5_cq_hold(struct mlx5_core_cq *cq)
+{
+	refcount_inc(&cq->refcount);
+}
+
+static inline void mlx5_cq_put(struct mlx5_core_cq *cq)
+{
+	if (refcount_dec_and_test(&cq->refcount))
+		complete(&cq->free);
+}
+
 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq,
 			u32 *in, int inlen);
 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq);