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loopback: sctp: add NETIF_F_SCTP_CSUM to device features

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Drivers are allowed to set NETIF_F_SCTP_CSUM if they have
hardware crc32c checksumming support for the SCTP protocol.
Currently, NETIF_F_SCTP_CSUM flag is available in igb,
ixgbe, i40e/i40evf drivers and for vlan devices.

If we don't have NETIF_F_SCTP_CSUM then crc32c is done
through CPU instructions, invoked from crypto layer, or
if not available as slow-path fallback in software.

Currently, loopback device propagates checksum offloading
feature flags in dev->features, but is missing SCTP checksum
offloading. Therefore, account for NETIF_F_SCTP_CSUM as
well.

Before patch:

./netperf_sctp -H 192.168.0.100 -t SCTP_STREAM_MANY
SCTP 1-TO-MANY STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.100 () port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

4194304 4194304   4096    10.00    4683.50

After patch:

./netperf_sctp -H 192.168.0.100 -t SCTP_STREAM_MANY
SCTP 1-TO-MANY STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.100 () port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

4194304 4194304   4096    10.00    15348.26

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-02-22 14:01:53 +01:00 • committed by David S. Miller
commit b17c706987
1 changed files with 1 additions and 0 deletions
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1
drivers/net/loopback.c
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@ -176,6 +176,7 @@ static void loopback_setup(struct net_device *dev)
| NETIF_F_UFO | NETIF_F_UFO
| NETIF_F_HW_CSUM | NETIF_F_HW_CSUM
| NETIF_F_RXCSUM | NETIF_F_RXCSUM
| NETIF_F_SCTP_CSUM
| NETIF_F_HIGHDMA | NETIF_F_HIGHDMA
| NETIF_F_LLTX | NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL | NETIF_F_NETNS_LOCAL