Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
e018ba1f | 2 | * linux/drivers/s390/net/qeth_tso.h |
1da177e4 LT |
3 | * |
4 | * Header file for qeth TCP Segmentation Offload support. | |
5 | * | |
6 | * Copyright 2004 IBM Corporation | |
7 | * | |
1387780f | 8 | * Author(s): Frank Pavlic <fpavlic@de.ibm.com> |
1da177e4 | 9 | * |
1da177e4 LT |
10 | */ |
11 | #ifndef __QETH_TSO_H__ | |
12 | #define __QETH_TSO_H__ | |
13 | ||
05e08a2a FP |
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" | |
1da177e4 | 21 | |
1da177e4 | 22 | |
05e08a2a FP |
23 | static inline struct qeth_hdr_tso * |
24 | qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb) | |
25 | { | |
26 | QETH_DBF_TEXT(trace, 5, "tsoprsk"); | |
f7b65d70 | 27 | return qeth_push_skb(card, *skb, sizeof(struct qeth_hdr_tso)); |
05e08a2a FP |
28 | } |
29 | ||
30 | /** | |
31 | * fill header for a TSO packet | |
32 | */ | |
33 | static inline void | |
34 | qeth_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; | |
1da177e4 | 39 | |
05e08a2a FP |
40 | QETH_DBF_TEXT(trace, 5, "tsofhdr"); |
41 | ||
42 | hdr = (struct qeth_hdr_tso *) skb->data; | |
eddc9ec5 | 43 | iph = ip_hdr(skb); |
05e08a2a FP |
44 | tcph = skb->h.th; |
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 */ | |
7967168c | 54 | hdr->ext.mss = skb_shinfo(skb)->gso_size; |
05e08a2a FP |
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 | */ | |
63 | static inline void | |
64 | qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb) | |
65 | { | |
eddc9ec5 ACM |
66 | struct iphdr *iph = ip_hdr(skb); |
67 | struct ipv6hdr *ip6h = skb->nh.ipv6h; | |
68 | struct tcphdr *tcph = skb->h.th; | |
05e08a2a FP |
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 | } | |
1da177e4 | 83 | |
1da177e4 | 84 | static inline int |
05e08a2a FP |
85 | qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb, |
86 | int ipv, int cast_type) | |
1da177e4 | 87 | { |
05e08a2a | 88 | struct qeth_hdr_tso *hdr; |
1da177e4 | 89 | |
05e08a2a FP |
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 | /*fill first 32 bytes of qdio header as used | |
99 | *FIXME: TSO has two struct members | |
100 | * with different names but same size | |
101 | * */ | |
102 | qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type); | |
103 | qeth_tso_fill_header(card, skb); | |
104 | qeth_tso_set_tcpip_header(card, skb); | |
105 | return 0; | |
d801145d FP |
106 | } |
107 | ||
108 | static inline void | |
109 | __qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer, | |
110 | int is_tso, int *next_element_to_fill) | |
111 | { | |
d801145d FP |
112 | struct skb_frag_struct *frag; |
113 | int fragno; | |
114 | unsigned long addr; | |
05e08a2a | 115 | int element, cnt, dlen; |
e82b0f2c | 116 | |
05e08a2a FP |
117 | fragno = skb_shinfo(skb)->nr_frags; |
118 | element = *next_element_to_fill; | |
119 | dlen = 0; | |
e82b0f2c | 120 | |
05e08a2a FP |
121 | if (is_tso) |
122 | buffer->element[element].flags = | |
123 | SBAL_FLAGS_MIDDLE_FRAG; | |
124 | else | |
125 | buffer->element[element].flags = | |
126 | SBAL_FLAGS_FIRST_FRAG; | |
127 | if ( (dlen = (skb->len - skb->data_len)) ) { | |
128 | buffer->element[element].addr = skb->data; | |
129 | buffer->element[element].length = dlen; | |
130 | element++; | |
1da177e4 | 131 | } |
05e08a2a FP |
132 | for (cnt = 0; cnt < fragno; cnt++) { |
133 | frag = &skb_shinfo(skb)->frags[cnt]; | |
134 | addr = (page_to_pfn(frag->page) << PAGE_SHIFT) + | |
135 | frag->page_offset; | |
136 | buffer->element[element].addr = (char *)addr; | |
137 | buffer->element[element].length = frag->size; | |
138 | if (cnt < (fragno - 1)) | |
139 | buffer->element[element].flags = | |
140 | SBAL_FLAGS_MIDDLE_FRAG; | |
141 | else | |
142 | buffer->element[element].flags = | |
143 | SBAL_FLAGS_LAST_FRAG; | |
144 | element++; | |
145 | } | |
146 | *next_element_to_fill = element; | |
1da177e4 LT |
147 | } |
148 | #endif /* __QETH_TSO_H__ */ |