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tile: avoid bug in tilepro net driver built with old hypervisor 

Building against headers from an older Tilera hypervisor can cause
the frags[] array to be overrun.  Don't enable TSO in that case.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Metcalf 2013-08-01 11:36:42 -04:00 committed by David S. Miller
parent 439a93a084
commit 815d3baeae
1 changed files with 6 additions and 3 deletions
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9
drivers/net/ethernet/tile/tilepro.c
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@ -1929,7 +1929,7 @@ static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
unsigned int csum_start = skb_checksum_start_offset(skb);
lepp_frag_t frags[LEPP_MAX_FRAGS];
lepp_frag_t frags[1 + MAX_SKB_FRAGS];
unsigned int num_frags;
@ -1944,7 +1944,7 @@ static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
unsigned int cmd_head, cmd_tail, cmd_next;
unsigned int comp_tail;
lepp_cmd_t cmds[LEPP_MAX_FRAGS];
lepp_cmd_t cmds[1 + MAX_SKB_FRAGS];
/*
@ -2332,7 +2332,10 @@ static void tile_net_setup(struct net_device *dev)
features |= NETIF_F_LLTX;
features |= NETIF_F_HW_CSUM;
features |= NETIF_F_SG;
features |= NETIF_F_TSO;
/* We support TSO iff the HV supports sufficient frags. */
if (LEPP_MAX_FRAGS >= 1 + MAX_SKB_FRAGS)
features |= NETIF_F_TSO;
/* We can't support HIGHDMA without hash_default, since we need
* to be able to finv() with a VA if we don't have hash_default.