linux-kernel - [PATCH 5.4 027/104] net/mlx5: E-Switch, Prevent ingress rate configuration of uplink rep

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Message-Id: <20200128135821.022792530@linuxfoundation.org>
Date:   Tue, 28 Jan 2020 14:59:48 +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, Eli Cohen <eli@...lanox.com>,
        Roi Dayan <roid@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH 5.4 027/104] net/mlx5: E-Switch, Prevent ingress rate configuration of uplink rep

From: Eli Cohen <eli@...lanox.com>

commit e401a1848be87123a2b2049addbf21138cb47081 upstream.

Since the implementation relies on limiting the VF transmit rate to
simulate ingress rate limiting, and since either uplink representor or
ecpf are not associated with a VF, we limit the rate limit configuration
for those ports.

Fixes: fcb64c0f5640 ("net/mlx5: E-Switch, add ingress rate support")
Signed-off-by: Eli Cohen <eli@...lanox.com>
Reviewed-by: Roi Dayan <roid@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3951,6 +3951,13 @@ static int apply_police_params(struct ml
 	u32 rate_mbps;
 	int err;
 
+	vport_num = rpriv->rep->vport;
+	if (vport_num >= MLX5_VPORT_ECPF) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Ingress rate limit is supported only for Eswitch ports connected to VFs");
+		return -EOPNOTSUPP;
+	}
+
 	esw = priv->mdev->priv.eswitch;
 	/* rate is given in bytes/sec.
 	 * First convert to bits/sec and then round to the nearest mbit/secs.
@@ -3959,8 +3966,6 @@ static int apply_police_params(struct ml
 	 * 1 mbit/sec.
 	 */
 	rate_mbps = rate ? max_t(u32, (rate * 8 + 500000) / 1000000, 1) : 0;
-	vport_num = rpriv->rep->vport;
-
 	err = mlx5_esw_modify_vport_rate(esw, vport_num, rate_mbps);
 	if (err)
 		NL_SET_ERR_MSG_MOD(extack, "failed applying action to hardware");