netdev - [RFC PATCH 05/21] mlx5/xsk: check that xsk does not conflict with netgpu

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Message-ID: <20200618160941.879717-6-jonathan.lemon@gmail.com>
Date:   Thu, 18 Jun 2020 09:09:25 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>
CC:     <kernel-team@...com>, <axboe@...nel.dk>
Subject: [RFC PATCH 05/21] mlx5/xsk: check that xsk does not conflict with netgpu

netgpu will use the same data structures as xsk, so make sure that
they are not conflicting.

Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c | 3 +++
 drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.h | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c
index 7b17fcd0a56d..f3d3569816cb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c
@@ -27,7 +27,10 @@ static int mlx5e_xsk_get_umems(struct mlx5e_xsk *xsk)
 				     sizeof(*xsk->umems), GFP_KERNEL);
 		if (unlikely(!xsk->umems))
 			return -ENOMEM;
+		xsk->is_netgpu = false;
 	}
+	if (xsk->is_netgpu)
+		return -EINVAL;
 
 	xsk->refcnt++;
 	xsk->ever_used = true;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.h
index 25b4cbe58b54..c7eff534d28a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.h
@@ -15,6 +15,9 @@ static inline struct xdp_umem *mlx5e_xsk_get_umem(struct mlx5e_params *params,
 	if (unlikely(ix >= params->num_channels))
 		return NULL;
 
+	if (unlikely(xsk->is_netgpu))
+		return NULL;
+
 	return xsk->umems[ix];
 }
 
-- 
2.24.1