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netvsc: reduce maximum GSO size

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[ Upstream commit a50af86dd49ee1851d1ccf06dd0019c05b95e297 ]

Hyper-V (and Azure) support using NVGRE which requires some extra space
for encapsulation headers. Because of this the largest allowed TSO
packet is reduced.

For older releases, hard code a fixed reduced value.  For next release,
there is a better solution which uses result of host offload
negotiation.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
stephen hemminger 2016-12-06 13:43:54 -08:00 committed by Greg Kroah-Hartman
parent 49c4446a2e
commit 33c7b0f74c
1 changed files with 3 additions and 0 deletions
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3
drivers/net/hyperv/netvsc_drv.c
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@ -40,6 +40,8 @@
#include "hyperv_net.h"
/* Restrict GSO size to account for NVGRE */
#define NETVSC_GSO_MAX_SIZE 62768
#define RING_SIZE_MIN 64
static int ring_size = 128;
@ -852,6 +854,7 @@ static int netvsc_set_channels(struct net_device *net,
}
goto recover;
}
netif_set_gso_max_size(net, NETVSC_GSO_MAX_SIZE);
out:
netvsc_open(net);