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authorShlomo Pongratz <shlomop@mellanox.com>2013-04-10 14:26:47 +0000
committerRoland Dreier <roland@purestorage.com>2013-04-16 22:42:55 -0700
commit9f550553a470d3b05fc8bdced3a738d8ed5b8d8a (patch)
tree8fd3f2332afb1827cc701192cca1153e63962185
parenteec9e29fc5e9b417649830ab76a3aa10b90d2e9f (diff)
mlx4_core: Implement SRQ object lookup from srqn
Expose a new API mlx4_srq_lookup() to retrive a SRQ based on its number. This API is needed in the mlx4_ib driver CQ polling logic, when a work completion is associated with a XRC TGT QP. Since a target QP may redirect to more than one XRC SRQ, the srq field in the QP has no usage and the real XRC SRQ need to be retrived using the information from the XRCETH IB header which is placed in the HW CQE. Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/srq.c15
-rw-r--r--include/linux/mlx4/srq.h2
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/srq.c b/drivers/net/ethernet/mellanox/mlx4/srq.c
index e329fe1f11b7..79fd269e2c54 100644
--- a/drivers/net/ethernet/mellanox/mlx4/srq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/srq.c
@@ -298,3 +298,18 @@ void mlx4_cleanup_srq_table(struct mlx4_dev *dev)
return;
mlx4_bitmap_cleanup(&mlx4_priv(dev)->srq_table.bitmap);
}
+
+struct mlx4_srq *mlx4_srq_lookup(struct mlx4_dev *dev, u32 srqn)
+{
+ struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
+ struct mlx4_srq *srq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&srq_table->lock, flags);
+ srq = radix_tree_lookup(&srq_table->tree,
+ srqn & (dev->caps.num_srqs - 1));
+ spin_unlock_irqrestore(&srq_table->lock, flags);
+
+ return srq;
+}
+EXPORT_SYMBOL_GPL(mlx4_srq_lookup);
diff --git a/include/linux/mlx4/srq.h b/include/linux/mlx4/srq.h
index 799a0697a383..192e0f7784f2 100644
--- a/include/linux/mlx4/srq.h
+++ b/include/linux/mlx4/srq.h
@@ -39,4 +39,6 @@ struct mlx4_wqe_srq_next_seg {
u32 reserved2[3];
};
+struct mlx4_srq *mlx4_srq_lookup(struct mlx4_dev *dev, u32 srqn);
+
#endif /* MLX4_SRQ_H */