1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* 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 = ipv6_hdr(skb);
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__ */
|
