This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / s390 / net / qeth_tso.h

diff --git a/drivers/s390/net/qeth_tso.h b/drivers/s390/net/qeth_tso.h
new file mode 100644 (file)
index 0000000..ad33e6f
--- /dev/null
+++ b/drivers/s390/net/qeth_tso.h
@@ -0,0 +1,154 @@
+/*
+ * linux/drivers/s390/net/qeth_tso.h ($Revision: 1.7 $)
+ *
+ * Header file for qeth TCP Segmentation Offload support.
+ *
+ * Copyright 2004 IBM Corporation
+ *
+ *    Author(s): Frank Pavlic <pavlic@de.ibm.com>
+ *
+ *    $Revision: 1.7 $  $Date: 2005/05/04 20:19:18 $
+ *
+ */
+#ifndef __QETH_TSO_H__
+#define __QETH_TSO_H__
+
+#include <linux/skbuff.h>
+#include <linux/tcp.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/ip6_checksum.h>
+#include "qeth.h"
+#include "qeth_mpc.h"
+
+
+static inline struct qeth_hdr_tso *
+qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb)
+{
+       QETH_DBF_TEXT(trace, 5, "tsoprsk");
+       return qeth_push_skb(card, skb, sizeof(struct qeth_hdr_tso));
+}
+
+/**
+ * fill header for a TSO packet
+ */
+static inline void
+qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
+{
+       struct qeth_hdr_tso *hdr;
+       struct tcphdr *tcph;
+       struct iphdr *iph;
+
+       QETH_DBF_TEXT(trace, 5, "tsofhdr");
+
+       hdr  = (struct qeth_hdr_tso *) skb->data;
+       iph  = skb->nh.iph;
+       tcph = skb->h.th;
+       /*fix header to TSO values ...*/
+       hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
+       /*set values which are fix for the first approach ...*/
+       hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
+       hdr->ext.imb_hdr_no  = 1;
+       hdr->ext.hdr_type    = 1;
+       hdr->ext.hdr_version = 1;
+       hdr->ext.hdr_len     = 28;
+       /*insert non-fix values */
+       hdr->ext.mss = skb_shinfo(skb)->tso_size;
+       hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
+       hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
+                                      sizeof(struct qeth_hdr_tso));
+}
+
+/**
+ * change some header values as requested by hardware
+ */
+static inline void
+qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
+{
+       struct iphdr *iph;
+       struct ipv6hdr *ip6h;
+       struct tcphdr *tcph;
+
+       iph  = skb->nh.iph;
+       ip6h = skb->nh.ipv6h;
+       tcph = skb->h.th;
+
+       tcph->check = 0;
+       if (skb->protocol == ETH_P_IPV6) {
+               ip6h->payload_len = 0;
+               tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+                                              0, IPPROTO_TCP, 0);
+               return;
+       }
+       /*OSA want us to set these values ...*/
+       tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+                                        0, IPPROTO_TCP, 0);
+       iph->tot_len = 0;
+       iph->check = 0;
+}
+
+static inline int
+qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb,
+                       int ipv, int cast_type)
+{
+       struct qeth_hdr_tso *hdr;
+
+       QETH_DBF_TEXT(trace, 5, "tsoprep");
+
+       hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb);
+       if (hdr == NULL) {
+               QETH_DBF_TEXT(trace, 4, "tsoperr");
+               return -ENOMEM;
+       }
+       memset(hdr, 0, sizeof(struct qeth_hdr_tso));
+       /*fill first 32 bytes of  qdio header as used
+        *FIXME: TSO has two struct members
+        * with different names but same size
+        * */
+       qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type);
+       qeth_tso_fill_header(card, skb);
+       qeth_tso_set_tcpip_header(card, skb);
+       return 0;
+}
+
+static inline void
+__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,
+                       int is_tso, int *next_element_to_fill)
+{
+       struct skb_frag_struct *frag;
+       int fragno;
+       unsigned long addr;
+       int element, cnt, dlen;
+       
+       fragno = skb_shinfo(skb)->nr_frags;
+       element = *next_element_to_fill;
+       dlen = 0;
+       
+       if (is_tso)
+               buffer->element[element].flags =
+                       SBAL_FLAGS_MIDDLE_FRAG;
+       else
+               buffer->element[element].flags =
+                       SBAL_FLAGS_FIRST_FRAG;
+       if ( (dlen = (skb->len - skb->data_len)) ) {
+               buffer->element[element].addr = skb->data;
+               buffer->element[element].length = dlen;
+               element++;
+       }
+       for (cnt = 0; cnt < fragno; cnt++) {
+               frag = &skb_shinfo(skb)->frags[cnt];
+               addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
+                       frag->page_offset;
+               buffer->element[element].addr = (char *)addr;
+               buffer->element[element].length = frag->size;
+               if (cnt < (fragno - 1))
+                       buffer->element[element].flags =
+                               SBAL_FLAGS_MIDDLE_FRAG;
+               else
+                       buffer->element[element].flags =
+                               SBAL_FLAGS_LAST_FRAG;
+               element++;
+       }
+       *next_element_to_fill = element;
+}
+#endif /* __QETH_TSO_H__ */