Commit | Line | Data |
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484611e5 | 1 | #include <linux/export.h> |
e876f208 EG |
2 | #include <net/ip.h> |
3 | #include <net/tso.h> | |
4 | ||
5 | /* Calculate expected number of TX descriptors */ | |
6 | int tso_count_descs(struct sk_buff *skb) | |
7 | { | |
8 | /* The Marvell Way */ | |
9 | return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags; | |
10 | } | |
484611e5 | 11 | EXPORT_SYMBOL(tso_count_descs); |
e876f208 EG |
12 | |
13 | void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso, | |
14 | int size, bool is_last) | |
15 | { | |
16 | struct iphdr *iph; | |
17 | struct tcphdr *tcph; | |
18 | int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); | |
19 | int mac_hdr_len = skb_network_offset(skb); | |
20 | ||
21 | memcpy(hdr, skb->data, hdr_len); | |
22 | iph = (struct iphdr *)(hdr + mac_hdr_len); | |
23 | iph->id = htons(tso->ip_id); | |
24 | iph->tot_len = htons(size + hdr_len - mac_hdr_len); | |
25 | tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb)); | |
26 | tcph->seq = htonl(tso->tcp_seq); | |
27 | tso->ip_id++; | |
28 | ||
29 | if (!is_last) { | |
30 | /* Clear all special flags for not last packet */ | |
31 | tcph->psh = 0; | |
32 | tcph->fin = 0; | |
33 | tcph->rst = 0; | |
34 | } | |
35 | } | |
484611e5 | 36 | EXPORT_SYMBOL(tso_build_hdr); |
e876f208 EG |
37 | |
38 | void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size) | |
39 | { | |
40 | tso->tcp_seq += size; | |
41 | tso->size -= size; | |
42 | tso->data += size; | |
43 | ||
44 | if ((tso->size == 0) && | |
45 | (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) { | |
46 | skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx]; | |
47 | ||
48 | /* Move to next segment */ | |
49 | tso->size = frag->size; | |
50 | tso->data = page_address(frag->page.p) + frag->page_offset; | |
51 | tso->next_frag_idx++; | |
52 | } | |
53 | } | |
484611e5 | 54 | EXPORT_SYMBOL(tso_build_data); |
e876f208 EG |
55 | |
56 | void tso_start(struct sk_buff *skb, struct tso_t *tso) | |
57 | { | |
58 | int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); | |
59 | ||
60 | tso->ip_id = ntohs(ip_hdr(skb)->id); | |
61 | tso->tcp_seq = ntohl(tcp_hdr(skb)->seq); | |
62 | tso->next_frag_idx = 0; | |
63 | ||
64 | /* Build first data */ | |
65 | tso->size = skb_headlen(skb) - hdr_len; | |
66 | tso->data = skb->data + hdr_len; | |
67 | if ((tso->size == 0) && | |
68 | (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) { | |
69 | skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx]; | |
70 | ||
71 | /* Move to next segment */ | |
72 | tso->size = frag->size; | |
73 | tso->data = page_address(frag->page.p) + frag->page_offset; | |
74 | tso->next_frag_idx++; | |
75 | } | |
76 | } | |
484611e5 | 77 | EXPORT_SYMBOL(tso_start); |