1/* 2 * linux/drivers/s390/net/qeth_tso.h 3 * 4 * Header file for qeth TCP Segmentation Offload support. 5 * 6 * Copyright 2004 IBM Corporation 7 * 8 * Author(s): Frank Pavlic <fpavlic@de.ibm.com> 9 * 10 */ 11#ifndef __QETH_TSO_H__ 12#define __QETH_TSO_H__ 13 14#include <linux/skbuff.h> 15#include <linux/tcp.h> 16#include <linux/ip.h> 17#include <linux/ipv6.h> 18#include <net/ip6_checksum.h> 19#include "qeth.h" 20#include "qeth_mpc.h" 21 22 23static inline struct qeth_hdr_tso * 24qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb) 25{ 26 QETH_DBF_TEXT(trace, 5, "tsoprsk"); 27 return qeth_push_skb(card, *skb, sizeof(struct qeth_hdr_tso)); 28} 29 30/** 31 * fill header for a TSO packet 32 */ 33static inline void 34qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb) 35{ 36 struct qeth_hdr_tso *hdr; 37 struct tcphdr *tcph; 38 struct iphdr *iph; 39 40 QETH_DBF_TEXT(trace, 5, "tsofhdr"); 41 42 hdr = (struct qeth_hdr_tso *) skb->data; 43 iph = ip_hdr(skb); 44 tcph = tcp_hdr(skb); 45 /*fix header to TSO values ...*/ 46 hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO; 47 /*set values which are fix for the first approach ...*/ 48 hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso); 49 hdr->ext.imb_hdr_no = 1; 50 hdr->ext.hdr_type = 1; 51 hdr->ext.hdr_version = 1; 52 hdr->ext.hdr_len = 28; 53 /*insert non-fix values */ 54 hdr->ext.mss = skb_shinfo(skb)->gso_size; 55 hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4); 56 hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len - 57 sizeof(struct qeth_hdr_tso)); 58} 59 60/** 61 * change some header values as requested by hardware 62 */ 63static inline void 64qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb) 65{ 66 struct iphdr *iph = ip_hdr(skb); 67 struct ipv6hdr *ip6h = ipv6_hdr(skb); 68 struct tcphdr *tcph = tcp_hdr(skb); 69 70 tcph->check = 0; 71 if (skb->protocol == ETH_P_IPV6) { 72 ip6h->payload_len = 0; 73 tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 74 0, IPPROTO_TCP, 0); 75 return; 76 } 77 /*OSA want us to set these values ...*/ 78 tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, 79 0, IPPROTO_TCP, 0); 80 iph->tot_len = 0; 81 iph->check = 0; 82} 83 84static inline int 85qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb, 86 int ipv, int cast_type) 87{ 88 struct qeth_hdr_tso *hdr; 89 90 QETH_DBF_TEXT(trace, 5, "tsoprep"); 91 92 hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb); 93 if (hdr == NULL) { 94 QETH_DBF_TEXT(trace, 4, "tsoperr"); 95 return -ENOMEM; 96 } 97 memset(hdr, 0, sizeof(struct qeth_hdr_tso)); 98 qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type); 99 qeth_tso_fill_header(card, skb); 100 qeth_tso_set_tcpip_header(card, skb); 101 return 0; 102} 103 104static inline void 105__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer, 106 int is_tso, int *next_element_to_fill) 107{ 108 struct skb_frag_struct *frag; 109 int fragno; 110 unsigned long addr; 111 int element, cnt, dlen; 112 113 fragno = skb_shinfo(skb)->nr_frags; 114 element = *next_element_to_fill; 115 dlen = 0; 116 117 if (is_tso) 118 buffer->element[element].flags = 119 SBAL_FLAGS_MIDDLE_FRAG; 120 else 121 buffer->element[element].flags = 122 SBAL_FLAGS_FIRST_FRAG; 123 if ( (dlen = (skb->len - skb->data_len)) ) { 124 buffer->element[element].addr = skb->data; 125 buffer->element[element].length = dlen; 126 element++; 127 } 128 for (cnt = 0; cnt < fragno; cnt++) { 129 frag = &skb_shinfo(skb)->frags[cnt]; 130 addr = (page_to_pfn(frag->page) << PAGE_SHIFT) + 131 frag->page_offset; 132 buffer->element[element].addr = (char *)addr; 133 buffer->element[element].length = frag->size; 134 if (cnt < (fragno - 1)) 135 buffer->element[element].flags = 136 SBAL_FLAGS_MIDDLE_FRAG; 137 else 138 buffer->element[element].flags = 139 SBAL_FLAGS_LAST_FRAG; 140 element++; 141 } 142 *next_element_to_fill = element; 143} 144#endif /* __QETH_TSO_H__ */ 145