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/*
* linux/drivers/s390/net/qeth_tso.h
*
* Header file for qeth TCP Segmentation Offload support.
*
* Copyright 2004 IBM Corporation
*
* Author(s): Frank Pavlic <fpavlic@de.ibm.com>
*
*/
#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 = ip_hdr(skb);
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)->gso_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 = ip_hdr(skb);
struct ipv6hdr *ip6h = skb->nh.ipv6h;
struct tcphdr *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__ */
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