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78 lines
2.1 KiB
78 lines
2.1 KiB
#include <linux/export.h> |
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#include <net/ip.h> |
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#include <net/tso.h> |
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#include <asm/unaligned.h> |
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/* Calculate expected number of TX descriptors */ |
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int tso_count_descs(struct sk_buff *skb) |
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{ |
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/* The Marvell Way */ |
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return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags; |
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} |
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EXPORT_SYMBOL(tso_count_descs); |
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void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso, |
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int size, bool is_last) |
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{ |
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struct iphdr *iph; |
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struct tcphdr *tcph; |
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int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); |
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int mac_hdr_len = skb_network_offset(skb); |
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memcpy(hdr, skb->data, hdr_len); |
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iph = (struct iphdr *)(hdr + mac_hdr_len); |
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iph->id = htons(tso->ip_id); |
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iph->tot_len = htons(size + hdr_len - mac_hdr_len); |
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tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb)); |
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put_unaligned_be32(tso->tcp_seq, &tcph->seq); |
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tso->ip_id++; |
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if (!is_last) { |
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/* Clear all special flags for not last packet */ |
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tcph->psh = 0; |
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tcph->fin = 0; |
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tcph->rst = 0; |
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} |
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} |
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EXPORT_SYMBOL(tso_build_hdr); |
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void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size) |
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{ |
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tso->tcp_seq += size; |
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tso->size -= size; |
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tso->data += size; |
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if ((tso->size == 0) && |
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(tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) { |
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skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx]; |
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/* Move to next segment */ |
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tso->size = frag->size; |
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tso->data = page_address(frag->page.p) + frag->page_offset; |
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tso->next_frag_idx++; |
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} |
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} |
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EXPORT_SYMBOL(tso_build_data); |
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void tso_start(struct sk_buff *skb, struct tso_t *tso) |
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{ |
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int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); |
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tso->ip_id = ntohs(ip_hdr(skb)->id); |
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tso->tcp_seq = ntohl(tcp_hdr(skb)->seq); |
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tso->next_frag_idx = 0; |
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/* Build first data */ |
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tso->size = skb_headlen(skb) - hdr_len; |
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tso->data = skb->data + hdr_len; |
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if ((tso->size == 0) && |
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(tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) { |
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skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx]; |
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/* Move to next segment */ |
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tso->size = frag->size; |
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tso->data = page_address(frag->page.p) + frag->page_offset; |
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tso->next_frag_idx++; |
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} |
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} |
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EXPORT_SYMBOL(tso_start);
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