net: Add a software TSO helper API
Although the implementation probably needs a lot of work, this initial API allows to implement software TSO in mvneta and mv643xx_eth drivers in a not so intrusive way. Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
8af750d739
Коммит
e876f208af
|
@ -0,0 +1,20 @@
|
|||
#ifndef _TSO_H
|
||||
#define _TSO_H
|
||||
|
||||
#include <net/ip.h>
|
||||
|
||||
struct tso_t {
|
||||
int next_frag_idx;
|
||||
void *data;
|
||||
size_t size;
|
||||
u16 ip_id;
|
||||
u32 tcp_seq;
|
||||
};
|
||||
|
||||
int tso_count_descs(struct sk_buff *skb);
|
||||
void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
|
||||
int size, bool is_last);
|
||||
void tso_build_data(struct sk_buff *skb, struct tso_t *tso, int size);
|
||||
void tso_start(struct sk_buff *skb, struct tso_t *tso);
|
||||
|
||||
#endif /* _TSO_H */
|
|
@ -9,7 +9,7 @@ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
|
|||
|
||||
obj-y += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \
|
||||
neighbour.o rtnetlink.o utils.o link_watch.o filter.o \
|
||||
sock_diag.o dev_ioctl.o
|
||||
sock_diag.o dev_ioctl.o tso.o
|
||||
|
||||
obj-$(CONFIG_XFRM) += flow.o
|
||||
obj-y += net-sysfs.o
|
||||
|
|
|
@ -0,0 +1,72 @@
|
|||
#include <net/ip.h>
|
||||
#include <net/tso.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;
|
||||
}
|
||||
|
||||
void tso_build_hdr(struct sk_buff *skb, char *hdr, struct tso_t *tso,
|
||||
int size, bool is_last)
|
||||
{
|
||||
struct iphdr *iph;
|
||||
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);
|
||||
iph = (struct iphdr *)(hdr + mac_hdr_len);
|
||||
iph->id = htons(tso->ip_id);
|
||||
iph->tot_len = htons(size + hdr_len - mac_hdr_len);
|
||||
tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb));
|
||||
tcph->seq = htonl(tso->tcp_seq);
|
||||
tso->ip_id++;
|
||||
|
||||
if (!is_last) {
|
||||
/* Clear all special flags for not last packet */
|
||||
tcph->psh = 0;
|
||||
tcph->fin = 0;
|
||||
tcph->rst = 0;
|
||||
}
|
||||
}
|
||||
|
||||
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++;
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
|
||||
/* 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++;
|
||||
}
|
||||
}
|
Загрузка…
Ссылка в новой задаче