#include <linux/export.h>
#include <linux/if_vlan.h>
#include <net/ip.h>
#include <net/tso.h>
#include <asm/unaligned.h>

/* Calculate expected number of TX descriptors */
int tso_count_descs(struct sk_buff *skb)
{
	/* The Marvell Way */
	return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
}
EXPORT_SYMBOL(tso_count_descs);

void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
		   int size, bool is_last)
{
	struct tcphdr *tcph;
	int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
	int mac_hdr_len = skb_network_offset(skb);

	memcpy(hdr, skb->data, hdr_len);
	if (!tso->ipv6) {
		struct iphdr *iph = (void *)(hdr + mac_hdr_len);

		iph->id = htons(tso->ip_id);
		iph->tot_len = htons(size + hdr_len - mac_hdr_len);
		tso->ip_id++;
	} else {
		struct ipv6hdr *iph = (void *)(hdr + mac_hdr_len);

		iph->payload_len = htons(size + tcp_hdrlen(skb));
	}
	tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb));
	put_unaligned_be32(tso->tcp_seq, &tcph->seq);

	if (!is_last) {
		/* Clear all special flags for not last packet */
		tcph->psh = 0;
		tcph->fin = 0;
		tcph->rst = 0;
	}
}
EXPORT_SYMBOL(tso_build_hdr);

void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size)
{
	tso->tcp_seq += size;
	tso->size -= size;
	tso->data += size;

	if ((tso->size == 0) &&
	    (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];

		/* Move to next segment */
		tso->size = frag->size;
		tso->data = page_address(frag->page.p) + frag->page_offset;
		tso->next_frag_idx++;
	}
}
EXPORT_SYMBOL(tso_build_data);

void tso_start(struct sk_buff *skb, struct tso_t *tso)
{
	int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);

	tso->ip_id = ntohs(ip_hdr(skb)->id);
	tso->tcp_seq = ntohl(tcp_hdr(skb)->seq);
	tso->next_frag_idx = 0;
	tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);

	/* Build first data */
	tso->size = skb_headlen(skb) - hdr_len;
	tso->data = skb->data + hdr_len;
	if ((tso->size == 0) &&
	    (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];

		/* Move to next segment */
		tso->size = frag->size;
		tso->data = page_address(frag->page.p) + frag->page_offset;
		tso->next_frag_idx++;
	}
}
EXPORT_SYMBOL(tso_start);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=751321b3dd5040dc5be19bd23f985e80c914621a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=751321b3dd5040dc5be19bd23f985e80c914621a'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc?id=751321b3dd5040dc5be19bd23f985e80c914621a'>nfc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/nci?id=751321b3dd5040dc5be19bd23f985e80c914621a'>nci</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a'>Kconfig</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='751321b3dd5040dc5be19bd23f985e80c914621a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-30 13:18:12 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-30 13:18:12 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a'>751321b3dd5040dc5be19bd23f985e80c914621a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=751321b3dd5040dc5be19bd23f985e80c914621a'>967928e24b38dc7fed918f932bb1b243af42bf7f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a'>net/nfc/nci/Kconfig</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/nci/Kconfig?id=566cf877a1fcb6d6dc0126b076aad062054c2637'>566cf877a1fcb6d6dc0126b076aad062054c2637</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/nfc/nci/Kconfig?id=586655d278ba08af7b198b93217746f9a506ee8a'>586655d278ba08af7b198b93217746f9a506ee8a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/nfc/nci/Kconfig?id=751321b3dd5040dc5be19bd23f985e80c914621a&amp;id2=586655d278ba08af7b198b93217746f9a506ee8a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'rtc-4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux</div><div class='commit-msg'>Pull RTC fix from Alexandre Belloni:
 "A single fix for this cycle. It is worth taking it for 4.10 so that
  distributions will not have CONFIG_RTC_DRV_JZ4740 switching from m to
  y in their config.

  Summary:
   - Allow jz4740 to build as a module again by using kernel_halt()"

* tag 'rtc-4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  rtc: jz4740: make the driver buildable as a module again
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=751321b3dd5040dc5be19bd23f985e80c914621a'>Diffstat</a> (limited to 'net/nfc/nci/Kconfig')</div><table summary='diffstat' class='diffstat'>