diff options
Diffstat (limited to 'compat/backport-4.4.c')
| -rw-r--r-- | compat/backport-4.4.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/compat/backport-4.4.c b/compat/backport-4.4.c new file mode 100644 index 0000000..1c11a20 --- /dev/null +++ b/compat/backport-4.4.c @@ -0,0 +1,154 @@ +/* + * Copyright(c) 2015 Intel Deutschland GmbH + * + * Backport functionality introduced in Linux 4.4. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/debugfs.h> +#include <linux/export.h> +#include <linux/uaccess.h> +#include <linux/fs.h> +#include <linux/if_vlan.h> +#include <linux/mm.h> +#include <linux/skbuff.h> +#include <net/ip.h> +#include <net/tso.h> +#include <asm/unaligned.h> + +#ifdef CONFIG_DEBUG_FS +#if LINUX_VERSION_IS_LESS(4,3,0) +static ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + char buf[3]; + bool *val = file->private_data; + + if (*val) + buf[0] = 'Y'; + else + buf[0] = 'N'; + buf[1] = '\n'; + buf[2] = 0x00; + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); +} + +static ssize_t debugfs_write_file_bool(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + char buf[32]; + size_t buf_size; + bool bv; + bool *val = file->private_data; + + buf_size = min(count, (sizeof(buf)-1)); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + + buf[buf_size] = '\0'; + if (strtobool(buf, &bv) == 0) + *val = bv; + + return count; +} +#endif /* < 4.3.0 */ + +static const struct file_operations fops_bool = { + .read = debugfs_read_file_bool, + .write = debugfs_write_file_bool, + .open = simple_open, + .llseek = default_llseek, +}; + +struct dentry *debugfs_create_bool(const char *name, umode_t mode, + struct dentry *parent, bool *value) +{ + return debugfs_create_file(name, mode, parent, value, &fops_bool); +} +EXPORT_SYMBOL_GPL(debugfs_create_bool); +#endif /* CONFIG_DEBUG_FS */ + +/* 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(skb_frag_page(frag)) + 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(skb_frag_page(frag)) + frag->page_offset; + tso->next_frag_idx++; + } +} +EXPORT_SYMBOL(tso_start); |