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