netdev - [PATCH net-next] vrf: add CRC32c offload to device features

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Message-Id: <bb3aa69eaef613f033f8f52674740286ba67dc31.1527175921.git.dcaratti@redhat.com>
Date:   Thu, 24 May 2018 17:49:35 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     David Ahern <dsa@...ulusnetworks.com>,
        Vlad Yasevich <vyasevich@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next] vrf: add CRC32c offload to device features

SCTP sockets originated in a VRF can improve their performance if CRC32c
computation is delegated to underlying devices: update device features,
setting NETIF_F_SCTP_CRC. Iterating the following command in the topology
proposed with [1],

 # ip vrf exec vrf-h2 netperf -H 192.0.2.1 -t SCTP_STREAM -- -m 10K

the measured throughput in Mbit/s improved from 2395 ± 1% to 2720 ± 1%.

[1] https://www.spinics.net/lists/netdev/msg486007.html

Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 drivers/net/vrf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 90b5f3900c22..f93547f257fb 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -1254,7 +1254,7 @@ static void vrf_setup(struct net_device *dev)
 
 	/* enable offload features */
 	dev->features   |= NETIF_F_GSO_SOFTWARE;
-	dev->features   |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM;
+	dev->features   |= NETIF_F_RXCSUM | NETIF_F_HW_CSUM | NETIF_F_SCTP_CRC;
 	dev->features   |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
 
 	dev->hw_features = dev->features;
-- 
2.17.0