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Message-ID: <05a1a2179d26849d97cb5ea15f8381cf6e93f6f4.1375385120.git.cmetcalf@tilera.com> Date: Thu, 1 Aug 2013 11:36:42 -0400 From: Chris Metcalf <cmetcalf@...era.com> To: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org> Subject: [PATCH v3 03/13] 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@...era.com> --- drivers/net/ethernet/tile/tilepro.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/tile/tilepro.c b/drivers/net/ethernet/tile/tilepro.c index 327ff7b..2f4b7b9 100644 --- a/drivers/net/ethernet/tile/tilepro.c +++ b/drivers/net/ethernet/tile/tilepro.c @@ -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. -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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