[PATCH] s390: qeth bug fixes

[patch 10/10] s390: qeth bug fixes.

From: Frank Pavlic <pavlic@de.ibm.com>

qeth network driver related changes:
 - due to OSA hardware changes in TCP Segmentation Offload
   support we are able now to pack TSO packets too.
   This fits perfectly in design of qeth buffer handling and
   sending data respectively.
 - remove skb_realloc_headroom from the sending path since
   hard_header_len value provides enough headroom now.
 - device recovery behaviour improvement
 - bug fixed in Enhanced Device Driver Packing functionality

Signed-off-by: Frank Pavlic <pavlic@de.ibm.com>

1 files changed, 25 insertions, 16 deletions

diff --git a/drivers/s390/net/qeth.h b/drivers/s390/net/qeth.h
index d13c105f74e6..a755b57db46b 100644
--- a/drivers/s390/net/qeth.h
+++ b/drivers/s390/net/qeth.h
@@ -24,7 +24,7 @@
 
 #include "qeth_mpc.h"
 
-#define VERSION_QETH_H          "$Revision: 1.137 $"
+#define VERSION_QETH_H          "$Revision: 1.139 $"
 
 #ifdef CONFIG_QETH_IPV6
 #define QETH_VERSION_IPV6       ":IPv6"
@@ -370,6 +370,25 @@ struct qeth_hdr {
         } hdr;
 } __attribute__ ((packed));
 
+/*TCP Segmentation Offload header*/
+struct qeth_hdr_ext_tso {
+        __u16 hdr_tot_len;
+        __u8  imb_hdr_no;
+        __u8  reserved;
+        __u8  hdr_type;
+        __u8  hdr_version;
+        __u16 hdr_len;
+        __u32 payload_len;
+        __u16 mss;
+        __u16 dg_hdr_len;
+        __u8  padding[16];
+} __attribute__ ((packed));
+
+struct qeth_hdr_tso {
+        struct qeth_hdr hdr;    /*hdr->hdr.l3.xxx*/
+        struct qeth_hdr_ext_tso ext;
+} __attribute__ ((packed));
+
 
 /* flags for qeth_hdr.flags */
 #define QETH_HDR_PASSTHRU 0x10
@@ -867,16 +886,6 @@ qeth_push_skb(struct qeth_card *card, struct sk_buff **skb, int size)
         return hdr;
 }
 
-static inline int
-qeth_get_skb_data_len(struct sk_buff *skb)
-{
-        int len = skb->len;
-        int i;
-
-        for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i)
-                len -= skb_shinfo(skb)->frags[i].size;
-        return len;
-}
 
 inline static int
 qeth_get_hlen(__u8 link_type)
@@ -885,19 +894,19 @@ qeth_get_hlen(__u8 link_type)
         switch (link_type) {
         case QETH_LINK_TYPE_HSTR:
         case QETH_LINK_TYPE_LANE_TR:
-                return sizeof(struct qeth_hdr) + TR_HLEN;
+                return sizeof(struct qeth_hdr_tso) + TR_HLEN;
         default:
 #ifdef CONFIG_QETH_VLAN
-                return sizeof(struct qeth_hdr) + VLAN_ETH_HLEN;
+                return sizeof(struct qeth_hdr_tso) + VLAN_ETH_HLEN;
 #else
-                return sizeof(struct qeth_hdr) + ETH_HLEN;
+                return sizeof(struct qeth_hdr_tso) + ETH_HLEN;
 #endif
         }
 #else  /* CONFIG_QETH_IPV6 */
 #ifdef CONFIG_QETH_VLAN
-        return sizeof(struct qeth_hdr) + VLAN_HLEN;
+        return sizeof(struct qeth_hdr_tso) + VLAN_HLEN;
 #else
-        return sizeof(struct qeth_hdr);
+        return sizeof(struct qeth_hdr_tso);
 #endif
 #endif /* CONFIG_QETH_IPV6 */
 }