/* * 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 = 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__ */