linux-kernel - [PATCH 4.15 104/163] mlx5: fix mlx5_get_vector_affinity to start from completion vector 0

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Date:   Wed, 21 Feb 2018 13:48:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Doug Ledford <dledford@...hat.com>
Subject: [PATCH 4.15 104/163] mlx5: fix mlx5_get_vector_affinity to start from completion vector 0

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sagi Grimberg <sagi@...mberg.me>

commit 2572cf57d75a7f91835d9a38771e9e76d575d122 upstream.

The consumers of this routine expects the affinity map of of vector
index relative to the first completion vector. The upper layers are
not aware of internal/private completion vectors that mlx5 allocates
for its own usage.

Hence, return the affinity map of vector index relative to the first
completion vector.

Fixes: 05e0cc84e00c ("net/mlx5: Fix get vector affinity helper function")
Reported-by: Logan Gunthorpe <logang@...tatee.com>
Tested-by: Max Gurtovoy <maxg@...lanox.com>
Reviewed-by: Max Gurtovoy <maxg@...lanox.com>
Cc: <stable@...r.kernel.org> # v4.15
Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/mlx5/driver.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -1238,7 +1238,7 @@ mlx5_get_vector_affinity(struct mlx5_cor
 	int eqn;
 	int err;
 
-	err = mlx5_vector2eqn(dev, vector, &eqn, &irq);
+	err = mlx5_vector2eqn(dev, MLX5_EQ_VEC_COMP_BASE + vector, &eqn, &irq);
 	if (err)
 		return NULL;