qeth: l3 send dhcp in non pass thru mode

dhcp frames are valid IPv4 packets so there is no need to send them
in pass thru mode. This allows dhcp packets to pass HiperSockets.
Also the dhcp release frame is send out correctly with this patch.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 7 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index a3ac4456e0b1..fcd005aad989 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -763,7 +763,8 @@ static inline int qeth_get_micros(void)
 
 static inline int qeth_get_ip_version(struct sk_buff *skb)
 {
-        switch (skb->protocol) {
+        struct ethhdr *ehdr = (struct ethhdr *)skb->data;
+        switch (ehdr->h_proto) {
         case ETH_P_IPV6:
                 return 6;
         case ETH_P_IP:
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 5475834ab916..42fe92c08c29 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2900,10 +2900,8 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         int data_offset = -1;
         int nr_frags;
 
-        if ((card->info.type == QETH_CARD_TYPE_IQD) &&
-            (((skb->protocol != htons(ETH_P_IPV6)) &&
-              (skb->protocol != htons(ETH_P_IP))) ||
-             card->options.sniffer))
+        if (((card->info.type == QETH_CARD_TYPE_IQD) && (!ipv)) ||
+             card->options.sniffer)
                         goto tx_drop;
 
         if ((card->state != CARD_STATE_UP) || !card->lan_online) {
@@ -2949,14 +2947,14 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 if (data_offset < 0)
                         skb_pull(new_skb, ETH_HLEN);
         } else {
-                if (new_skb->protocol == htons(ETH_P_IP)) {
+                if (ipv == 4) {
                         if (card->dev->type == ARPHRD_IEEE802_TR)
                                 skb_pull(new_skb, TR_HLEN);
                         else
                                 skb_pull(new_skb, ETH_HLEN);
                 }
 
-                if (new_skb->protocol == ETH_P_IPV6 && card->vlangrp &&
+                if (ipv == 6 && card->vlangrp &&
                                 vlan_tx_tag_present(new_skb)) {
                         skb_push(new_skb, VLAN_HLEN);
                         skb_copy_to_linear_data(new_skb, new_skb->data + 4, 4);