forked from rrcarlosr/Jetpack
161 lines
4.1 KiB
C
161 lines
4.1 KiB
C
/*
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* Copyright(c) 2015 Intel Deutschland GmbH
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*
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* Backport functionality introduced in Linux 4.4.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/debugfs.h>
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/if_vlan.h>
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#include <linux/mm.h>
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#include <linux/skbuff.h>
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#include <linux/tcp.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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#ifdef CONFIG_DEBUG_FS
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#if LINUX_VERSION_IS_LESS(4,3,0)
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static ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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char buf[3];
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bool *val = file->private_data;
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if (*val)
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buf[0] = 'Y';
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else
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buf[0] = 'N';
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buf[1] = '\n';
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buf[2] = 0x00;
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return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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}
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static ssize_t debugfs_write_file_bool(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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char buf[32];
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size_t buf_size;
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bool bv;
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bool *val = file->private_data;
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buf_size = min(count, (sizeof(buf)-1));
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if (copy_from_user(buf, user_buf, buf_size))
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return -EFAULT;
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buf[buf_size] = '\0';
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if (strtobool(buf, &bv) == 0)
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*val = bv;
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return count;
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}
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#endif /* < 4.3.0 */
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static const struct file_operations fops_bool = {
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.read = debugfs_read_file_bool,
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.write = debugfs_write_file_bool,
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.open = simple_open,
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.llseek = default_llseek,
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};
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struct dentry *debugfs_create_bool(const char *name, umode_t mode,
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struct dentry *parent, bool *value)
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{
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return debugfs_create_file(name, mode, parent, value, &fops_bool);
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}
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EXPORT_SYMBOL_GPL(debugfs_create_bool);
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#endif /* CONFIG_DEBUG_FS */
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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 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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if (!tso->ipv6) {
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struct iphdr *iph = (void *)(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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tso->ip_id++;
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} else {
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#ifdef CONFIG_IPV6
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struct ipv6hdr *iph = (void *)(hdr + mac_hdr_len);
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iph->payload_len = htons(size + tcp_hdrlen(skb));
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#else /* CONFIG_IPV6 */
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/* tso->ipv6 should never be set if IPV6 is not enabeld */
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WARN_ON(1);
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#endif /* CONFIG_IPV6 */
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}
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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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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(skb_frag_page(frag)) + 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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tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);
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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(skb_frag_page(frag)) + 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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