mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
7967168cef
Having separate fields in sk_buff for TSO/UFO (tso_size/ufo_size) is not going to scale if we add any more segmentation methods (e.g., DCCP). So let's merge them. They were used to tell the protocol of a packet. This function has been subsumed by the new gso_type field. This is essentially a set of netdev feature bits (shifted by 16 bits) that are required to process a specific skb. As such it's easy to tell whether a given device can process a GSO skb: you just have to and the gso_type field and the netdev's features field. I've made gso_type a conjunction. The idea is that you have a base type (e.g., SKB_GSO_TCPV4) that can be modified further to support new features. For example, if we add a hardware TSO type that supports ECN, they would declare NETIF_F_TSO | NETIF_F_TSO_ECN. All TSO packets with CWR set would have a gso_type of SKB_GSO_TCPV4 | SKB_GSO_TCPV4_ECN while all other TSO packets would be SKB_GSO_TCPV4. This means that only the CWR packets need to be emulated in software. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/*
|
|
* linux/drivers/s390/net/qeth_tso.h
|
|
*
|
|
* Header file for qeth TCP Segmentation Offload support.
|
|
*
|
|
* Copyright 2004 IBM Corporation
|
|
*
|
|
* Author(s): Frank Pavlic <fpavlic@de.ibm.com>
|
|
*
|
|
*/
|
|
#ifndef __QETH_TSO_H__
|
|
#define __QETH_TSO_H__
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <net/ip6_checksum.h>
|
|
#include "qeth.h"
|
|
#include "qeth_mpc.h"
|
|
|
|
|
|
static inline struct qeth_hdr_tso *
|
|
qeth_tso_prepare_skb(struct qeth_card *card, struct sk_buff **skb)
|
|
{
|
|
QETH_DBF_TEXT(trace, 5, "tsoprsk");
|
|
return qeth_push_skb(card, skb, sizeof(struct qeth_hdr_tso));
|
|
}
|
|
|
|
/**
|
|
* fill header for a TSO packet
|
|
*/
|
|
static inline void
|
|
qeth_tso_fill_header(struct qeth_card *card, struct sk_buff *skb)
|
|
{
|
|
struct qeth_hdr_tso *hdr;
|
|
struct tcphdr *tcph;
|
|
struct iphdr *iph;
|
|
|
|
QETH_DBF_TEXT(trace, 5, "tsofhdr");
|
|
|
|
hdr = (struct qeth_hdr_tso *) skb->data;
|
|
iph = skb->nh.iph;
|
|
tcph = skb->h.th;
|
|
/*fix header to TSO values ...*/
|
|
hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO;
|
|
/*set values which are fix for the first approach ...*/
|
|
hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);
|
|
hdr->ext.imb_hdr_no = 1;
|
|
hdr->ext.hdr_type = 1;
|
|
hdr->ext.hdr_version = 1;
|
|
hdr->ext.hdr_len = 28;
|
|
/*insert non-fix values */
|
|
hdr->ext.mss = skb_shinfo(skb)->gso_size;
|
|
hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4);
|
|
hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -
|
|
sizeof(struct qeth_hdr_tso));
|
|
}
|
|
|
|
/**
|
|
* change some header values as requested by hardware
|
|
*/
|
|
static inline void
|
|
qeth_tso_set_tcpip_header(struct qeth_card *card, struct sk_buff *skb)
|
|
{
|
|
struct iphdr *iph;
|
|
struct ipv6hdr *ip6h;
|
|
struct tcphdr *tcph;
|
|
|
|
iph = skb->nh.iph;
|
|
ip6h = skb->nh.ipv6h;
|
|
tcph = skb->h.th;
|
|
|
|
tcph->check = 0;
|
|
if (skb->protocol == ETH_P_IPV6) {
|
|
ip6h->payload_len = 0;
|
|
tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
|
|
0, IPPROTO_TCP, 0);
|
|
return;
|
|
}
|
|
/*OSA want us to set these values ...*/
|
|
tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
|
|
0, IPPROTO_TCP, 0);
|
|
iph->tot_len = 0;
|
|
iph->check = 0;
|
|
}
|
|
|
|
static inline int
|
|
qeth_tso_prepare_packet(struct qeth_card *card, struct sk_buff *skb,
|
|
int ipv, int cast_type)
|
|
{
|
|
struct qeth_hdr_tso *hdr;
|
|
|
|
QETH_DBF_TEXT(trace, 5, "tsoprep");
|
|
|
|
hdr = (struct qeth_hdr_tso *) qeth_tso_prepare_skb(card, &skb);
|
|
if (hdr == NULL) {
|
|
QETH_DBF_TEXT(trace, 4, "tsoperr");
|
|
return -ENOMEM;
|
|
}
|
|
memset(hdr, 0, sizeof(struct qeth_hdr_tso));
|
|
/*fill first 32 bytes of qdio header as used
|
|
*FIXME: TSO has two struct members
|
|
* with different names but same size
|
|
* */
|
|
qeth_fill_header(card, &hdr->hdr, skb, ipv, cast_type);
|
|
qeth_tso_fill_header(card, skb);
|
|
qeth_tso_set_tcpip_header(card, skb);
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
__qeth_fill_buffer_frag(struct sk_buff *skb, struct qdio_buffer *buffer,
|
|
int is_tso, int *next_element_to_fill)
|
|
{
|
|
struct skb_frag_struct *frag;
|
|
int fragno;
|
|
unsigned long addr;
|
|
int element, cnt, dlen;
|
|
|
|
fragno = skb_shinfo(skb)->nr_frags;
|
|
element = *next_element_to_fill;
|
|
dlen = 0;
|
|
|
|
if (is_tso)
|
|
buffer->element[element].flags =
|
|
SBAL_FLAGS_MIDDLE_FRAG;
|
|
else
|
|
buffer->element[element].flags =
|
|
SBAL_FLAGS_FIRST_FRAG;
|
|
if ( (dlen = (skb->len - skb->data_len)) ) {
|
|
buffer->element[element].addr = skb->data;
|
|
buffer->element[element].length = dlen;
|
|
element++;
|
|
}
|
|
for (cnt = 0; cnt < fragno; cnt++) {
|
|
frag = &skb_shinfo(skb)->frags[cnt];
|
|
addr = (page_to_pfn(frag->page) << PAGE_SHIFT) +
|
|
frag->page_offset;
|
|
buffer->element[element].addr = (char *)addr;
|
|
buffer->element[element].length = frag->size;
|
|
if (cnt < (fragno - 1))
|
|
buffer->element[element].flags =
|
|
SBAL_FLAGS_MIDDLE_FRAG;
|
|
else
|
|
buffer->element[element].flags =
|
|
SBAL_FLAGS_LAST_FRAG;
|
|
element++;
|
|
}
|
|
*next_element_to_fill = element;
|
|
}
|
|
#endif /* __QETH_TSO_H__ */
|