netdev - [net 08/10] net/mlx5e: Protect global IPsec ASO

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Message-Id: <20230118080414.77902-9-saeed@kernel.org>
Date:   Wed, 18 Jan 2023 00:04:12 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jianbo Liu <jianbol@...dia.com>
Subject: [net 08/10] net/mlx5e: Protect global IPsec ASO

From: Leon Romanovsky <leonro@...dia.com>

ASO operations are global to whole IPsec as they share one DMA address
for all operations. As such all WQE operations need to be protected with
lock. In this case, it must be spinlock to allow mlx5e_ipsec_aso_query()
operate in atomic context.

Fixes: 1ed78fc03307 ("net/mlx5e: Update IPsec soft and hard limits")
Reviewed-by: Jianbo Liu <jianbol@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h   | 2 ++
 .../ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c   | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
index 160f8883b93e..8bed9c361075 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
@@ -122,6 +122,8 @@ struct mlx5e_ipsec_aso {
 	u8 ctx[MLX5_ST_SZ_BYTES(ipsec_aso)];
 	dma_addr_t dma_addr;
 	struct mlx5_aso *aso;
+	/* Protect ASO WQ access, as it is global to whole IPsec */
+	spinlock_t lock;
 };
 
 struct mlx5e_ipsec {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
index aafbd7b244ee..2461462b7b99 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
@@ -396,6 +396,7 @@ int mlx5e_ipsec_aso_init(struct mlx5e_ipsec *ipsec)
 		goto err_aso_create;
 	}
 
+	spin_lock_init(&aso->lock);
 	ipsec->nb.notifier_call = mlx5e_ipsec_event;
 	mlx5_notifier_register(mdev, &ipsec->nb);
 
@@ -454,10 +455,12 @@ int mlx5e_ipsec_aso_query(struct mlx5e_ipsec_sa_entry *sa_entry,
 	struct mlx5e_hw_objs *res;
 	struct mlx5_aso_wqe *wqe;
 	u8 ds_cnt;
+	int ret;
 
 	lockdep_assert_held(&sa_entry->x->lock);
 	res = &mdev->mlx5e_res.hw_objs;
 
+	spin_lock_bh(&aso->lock);
 	memset(aso->ctx, 0, sizeof(aso->ctx));
 	wqe = mlx5_aso_get_wqe(aso->aso);
 	ds_cnt = DIV_ROUND_UP(sizeof(*wqe), MLX5_SEND_WQE_DS);
@@ -472,7 +475,9 @@ int mlx5e_ipsec_aso_query(struct mlx5e_ipsec_sa_entry *sa_entry,
 	mlx5e_ipsec_aso_copy(ctrl, data);
 
 	mlx5_aso_post_wqe(aso->aso, false, &wqe->ctrl);
-	return mlx5_aso_poll_cq(aso->aso, false);
+	ret = mlx5_aso_poll_cq(aso->aso, false);
+	spin_unlock_bh(&aso->lock);
+	return ret;
 }
 
 void mlx5e_ipsec_aso_update_curlft(struct mlx5e_ipsec_sa_entry *sa_entry,
-- 
2.39.0