[TG3]: Fix TSO bugs.

1. Remove the check for skb->len greater than MTU when doing TSO.
When the destination has a smaller MSS than the source, a TSO packet
may be smaller than the MTU and we still need to process it as a TSO
packet.

2. On 5705A3 devices with TSO enabled, the DMA engine can hang due to a
hardware bug.  This patch avoids the hanging condition by reducing the
DMA burst size.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 9488f49ea569..b8141be56d74 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -3895,8 +3895,7 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
         entry = tp->tx_prod;
         base_flags = 0;
         mss = 0;
-        if (skb->len > (tp->dev->mtu + ETH_HLEN) &&
-            (mss = skb_shinfo(skb)->gso_size) != 0) {
+        if ((mss = skb_shinfo(skb)->gso_size) != 0) {
                 int tcp_opt_len, ip_tcp_len;
 
                 if (skb_header_cloned(skb) &&
@@ -4053,8 +4052,7 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
         if (skb->ip_summed == CHECKSUM_PARTIAL)
                 base_flags |= TXD_FLAG_TCPUDP_CSUM;
         mss = 0;
-        if (skb->len > (tp->dev->mtu + ETH_HLEN) &&
-            (mss = skb_shinfo(skb)->gso_size) != 0) {
+        if ((mss = skb_shinfo(skb)->gso_size) != 0) {
                 struct iphdr *iph;
                 int tcp_opt_len, ip_tcp_len, hdr_len;
 
@@ -6346,8 +6344,7 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
              tp->pci_chip_rev_id != CHIPREV_ID_5705_A0) ||
             (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5750)) {
                 if (tp->tg3_flags2 & TG3_FLG2_TSO_CAPABLE &&
-                    (tp->pci_chip_rev_id == CHIPREV_ID_5705_A1 ||
-                     tp->pci_chip_rev_id == CHIPREV_ID_5705_A2)) {
+                    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5705) {
                         rdmac_mode |= RDMAC_MODE_FIFO_SIZE_128;
                 } else if (!(tr32(TG3PCI_PCISTATE) & PCISTATE_BUS_SPEED_HIGH) &&
                            !(tp->tg3_flags2 & TG3_FLG2_IS_5788)) {