linux-kernel - [PATCH 4.19 57/58] net: Disable NETIF_F_HW_TLS

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Message-Id: <20210125183159.141440130@linuxfoundation.org>
Date:   Mon, 25 Jan 2021 19:39:58 +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, Tariq Toukan <tariqt@...dia.com>,
        Boris Pismenny <borisp@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 4.19 57/58] net: Disable NETIF_F_HW_TLS_RX when RXCSUM is disabled

From: Tariq Toukan <tariqt@...dia.com>

commit a3eb4e9d4c9218476d05c52dfd2be3d6fdce6b91 upstream.

With NETIF_F_HW_TLS_RX packets are decrypted in HW. This cannot be
logically done when RXCSUM offload is off.

Fixes: 14136564c8ee ("net: Add TLS RX offload feature")
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Boris Pismenny <borisp@...dia.com>
Link: https://lore.kernel.org/r/20210117151538.9411-1-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/core/dev.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -8351,6 +8351,11 @@ static netdev_features_t netdev_fix_feat
 		}
 	}
 
+	if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) {
+		netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n");
+		features &= ~NETIF_F_HW_TLS_RX;
+	}
+
 	return features;
 }