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authorMichael Chan <mchan@broadcom.com>2014-05-12 07:22:54 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-14 02:38:51 +0400
commitd3f6f3a1d818410c17445bce4f4caab52eb102f1 (patch)
tree19370e26092b97714c595cee5b71f90f303fd0db /drivers/net/ethernet/broadcom/tg3.c
parentd71c0dc4e961e74143a644f248fc1a39cabf6586 (diff)
downloadlinux-d3f6f3a1d818410c17445bce4f4caab52eb102f1.tar.xz
tg3: Prevent page allocation failure during TSO workaround
If any TSO fragment hits hardware bug conditions (e.g. 4G boundary), the driver will workaround by calling skb_copy() to copy to a linear SKB. Users have reported page allocation failures as the TSO packet can be up to 64K. Copying such a large packet is also very inefficient. We fix this by using existing tg3_tso_bug() to transmit the packet using GSO. Signed-off-by: Prashant Sreedharan <prashant@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom/tg3.c')
-rw-r--r--drivers/net/ethernet/broadcom/tg3.c33
1 files changed, 26 insertions, 7 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index bdfd08bcfe57..36b2b51facb9 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7882,6 +7882,10 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct tg3_napi *tnapi;
struct netdev_queue *txq;
unsigned int last;
+ struct iphdr *iph = NULL;
+ struct tcphdr *tcph = NULL;
+ __sum16 tcp_csum = 0, ip_csum = 0;
+ __be16 ip_tot_len = 0;
txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
tnapi = &tp->napi[skb_get_queue_mapping(skb)];
@@ -7913,7 +7917,6 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
mss = skb_shinfo(skb)->gso_size;
if (mss) {
- struct iphdr *iph;
u32 tcp_opt_len, hdr_len;
if (skb_cow_head(skb, 0))
@@ -7929,6 +7932,8 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
tg3_flag(tp, TSO_BUG))
return tg3_tso_bug(tp, skb);
+ ip_csum = iph->check;
+ ip_tot_len = iph->tot_len;
iph->check = 0;
iph->tot_len = htons(mss + hdr_len);
}
@@ -7936,16 +7941,18 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
base_flags |= (TXD_FLAG_CPU_PRE_DMA |
TXD_FLAG_CPU_POST_DMA);
+ tcph = tcp_hdr(skb);
+ tcp_csum = tcph->check;
+
if (tg3_flag(tp, HW_TSO_1) ||
tg3_flag(tp, HW_TSO_2) ||
tg3_flag(tp, HW_TSO_3)) {
- tcp_hdr(skb)->check = 0;
+ tcph->check = 0;
base_flags &= ~TXD_FLAG_TCPUDP_CSUM;
- } else
- tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
- iph->daddr, 0,
- IPPROTO_TCP,
- 0);
+ } else {
+ tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+ 0, IPPROTO_TCP, 0);
+ }
if (tg3_flag(tp, HW_TSO_3)) {
mss |= (hdr_len & 0xc) << 12;
@@ -8045,6 +8052,18 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (would_hit_hwbug) {
tg3_tx_skb_unmap(tnapi, tnapi->tx_prod, i);
+ if (mss) {
+ /* If it's a TSO packet, do GSO instead of
+ * allocating and copying to a large linear SKB
+ */
+ if (ip_tot_len) {
+ iph->check = ip_csum;
+ iph->tot_len = ip_tot_len;
+ }
+ tcph->check = tcp_csum;
+ return tg3_tso_bug(tp, skb);
+ }
+
/* If the workaround fails due to memory/mapping
* failure, silently drop this packet.
*/