Note that TSO core helpers have been implemented in 3.19,
but support for IPv6 was added in 4.4 only.
iwlwifi will soon need this.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
backport/backport-include/net/tso.h | 33 ++++++++++++++
backport/compat/backport-4.4.c | 89 +++++++++++++++++++++++++++++++++++++
2 files changed, 122 insertions(+)
create mode 100644 backport/backport-include/net/tso.h
diff --git a/backport/backport-include/net/tso.h b/backport/backport-include/net/tso.h
new file mode 100644
index 0000000..816928c
--- /dev/null
+++ b/backport/backport-include/net/tso.h
@@ -0,0 +1,33 @@
+#ifndef BACKPORT_TSO_H
+#define BACKPORT_TSO_H
+
+#include <net/ip.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,4,0)
+
+#define tso_t LINUX_BACKPORT(tso_t)
+struct tso_t {
+ int next_frag_idx;
+ void *data;
+ size_t size;
+ u16 ip_id;
+ bool ipv6;
+ u32 tcp_seq;
+};
+
+#define tso_count_descs LINUX_BACKPORT(tso_count_descs)
+int tso_count_descs(struct sk_buff *skb);
+
+#define tso_build_hdr LINUX_BACKPORT(tso_build_hdr)
+void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
+ int size, bool is_last);
+#define tso_build_data LINUX_BACKPORT(tso_build_data)
+void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size);
+#define tso_start LINUX_BACKPORT(tso_start)
+void tso_start(struct sk_buff *skb, struct tso_t *tso);
+
+#else
+#include_next <net/tso.h>
+#endif
+
+#endif /* BACKPORT_TSO_H */
diff --git a/backport/compat/backport-4.4.c b/backport/compat/backport-4.4.c
index 43e26e5..2ea0d67 100644
--- a/backport/compat/backport-4.4.c
+++ b/backport/compat/backport-4.4.c
@@ -11,6 +11,14 @@
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
+#include <linux/export.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_CODE < KERNEL_VERSION(4,3,0)
@@ -64,3 +72,84 @@ struct dentry *debugfs_create_bool(const char *name, umode_t mode,
}
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 = 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 = skb_frag_page(frag) + frag->page_offset;
+ tso->next_frag_idx++;
+ }
+}
+EXPORT_SYMBOL(tso_start);
--
2.5.0
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