[patch 8/10] s390: fakell for high speed token ring

From: Frank Pavlic
Date: Fri May 27 2005 - 04:18:12 EST

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[patch 8/10] s390: fakell for high speed token ring.

From: Michael Holzheu <holzheu@xxxxxxxxxx>

Implement fake-link-layer for high speed token ring. Without it
token ring packages get leading ethernet headers, which confuses
dhcp.

Signed-off-by: Frank Pavlic <pavlic@xxxxxxxxxx>

diffstat:
drivers/s390/net/qeth.h | 5 -
drivers/s390/net/qeth_main.c | 136 +++++++++++++++++++++++++++++++++++--------
2 files changed, 114 insertions(+), 27 deletions(-)

diff -urpN linux-2.6/drivers/s390/net/qeth.h linux-2.6-patched/drivers/s390/net/qeth.h
--- linux-2.6/drivers/s390/net/qeth.h 2005-05-06 11:26:14.000000000 +0200
+++ linux-2.6-patched/drivers/s390/net/qeth.h 2005-05-06 11:26:15.000000000 +0200
@@ -24,7 +24,7 @@

#include "qeth_mpc.h"

-#define VERSION_QETH_H "$Revision: 1.136 $"
+#define VERSION_QETH_H "$Revision: 1.137 $"

#ifdef CONFIG_QETH_IPV6
#define QETH_VERSION_IPV6 ":IPv6"
@@ -288,7 +288,8 @@ qeth_is_ipa_enabled(struct qeth_ipa_info
#define QETH_TX_TIMEOUT 100 * HZ
#define QETH_HEADER_SIZE 32
#define MAX_PORTNO 15
-#define QETH_FAKE_LL_LEN ETH_HLEN
+#define QETH_FAKE_LL_LEN_ETH ETH_HLEN
+#define QETH_FAKE_LL_LEN_TR (sizeof(struct trh_hdr)-TR_MAXRIFLEN+sizeof(struct trllc))
#define QETH_FAKE_LL_V6_ADDR_POS 24

/*IPv6 address autoconfiguration stuff*/
diff -urpN linux-2.6/drivers/s390/net/qeth_main.c linux-2.6-patched/drivers/s390/net/qeth_main.c
--- linux-2.6/drivers/s390/net/qeth_main.c 2005-05-06 11:26:14.000000000 +0200
+++ linux-2.6-patched/drivers/s390/net/qeth_main.c 2005-05-06 11:26:15.000000000 +0200
@@ -1,6 +1,6 @@
/*
*
- * linux/drivers/s390/net/qeth_main.c ($Revision: 1.207 $)
+ * linux/drivers/s390/net/qeth_main.c ($Revision: 1.209 $)
*
* Linux on zSeries OSA Express and HiperSockets support
*
@@ -12,7 +12,7 @@
* Frank Pavlic (pavlic@xxxxxxxxxx) and
* Thomas Spatzier <tspat@xxxxxxxxxx>
*
- * $Revision: 1.207 $ $Date: 2005/04/01 21:40:40 $
+ * $Revision: 1.209 $ $Date: 2005/04/18 11:58:48 $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -80,7 +80,7 @@ qeth_eyecatcher(void)
#include "qeth_eddp.h"
#include "qeth_tso.h"

-#define VERSION_QETH_C "$Revision: 1.207 $"
+#define VERSION_QETH_C "$Revision: 1.209 $"
static const char *version = "qeth S/390 OSA-Express driver";

/**
@@ -2152,9 +2152,15 @@ qeth_get_next_skb(struct qeth_card *card
if (!skb_len)
return NULL;
if (card->options.fake_ll){
- if (!(skb = qeth_get_skb(skb_len + QETH_FAKE_LL_LEN)))
- goto no_mem;
- skb_pull(skb, QETH_FAKE_LL_LEN);
+ if(card->dev->type == ARPHRD_IEEE802_TR){
+ if (!(skb = qeth_get_skb(skb_len+QETH_FAKE_LL_LEN_TR)))
+ goto no_mem;
+ skb_reserve(skb,QETH_FAKE_LL_LEN_TR);
+ } else {
+ if (!(skb = qeth_get_skb(skb_len+QETH_FAKE_LL_LEN_ETH)))
+ goto no_mem;
+ skb_reserve(skb,QETH_FAKE_LL_LEN_ETH);
+ }
} else if (!(skb = qeth_get_skb(skb_len)))
goto no_mem;
data_ptr = element->addr + offset;
@@ -2229,14 +2235,68 @@ qeth_type_trans(struct sk_buff *skb, str
}

static inline void
-qeth_rebuild_skb_fake_ll(struct qeth_card *card, struct sk_buff *skb,
+qeth_rebuild_skb_fake_ll_tr(struct qeth_card *card, struct sk_buff *skb,
+ struct qeth_hdr *hdr)
+{
+ struct trh_hdr *fake_hdr;
+ struct trllc *fake_llc;
+ struct iphdr *ip_hdr;
+
+ QETH_DBF_TEXT(trace,5,"skbfktr");
+ skb->mac.raw = skb->data - QETH_FAKE_LL_LEN_TR;
+ /* this is a fake ethernet header */
+ fake_hdr = (struct trh_hdr *) skb->mac.raw;
+
+ /* the destination MAC address */
+ switch (skb->pkt_type){
+ case PACKET_MULTICAST:
+ switch (skb->protocol){
+#ifdef CONFIG_QETH_IPV6
+ case __constant_htons(ETH_P_IPV6):
+ ndisc_mc_map((struct in6_addr *)
+ skb->data + QETH_FAKE_LL_V6_ADDR_POS,
+ fake_hdr->daddr, card->dev, 0);
+ break;
+#endif /* CONFIG_QETH_IPV6 */
+ case __constant_htons(ETH_P_IP):
+ ip_hdr = (struct iphdr *)skb->data;
+ ip_tr_mc_map(ip_hdr->daddr, fake_hdr->daddr);
+ break;
+ default:
+ memcpy(fake_hdr->daddr, card->dev->dev_addr, TR_ALEN);
+ }
+ break;
+ case PACKET_BROADCAST:
+ memset(fake_hdr->daddr, 0xff, TR_ALEN);
+ break;
+ default:
+ memcpy(fake_hdr->daddr, card->dev->dev_addr, TR_ALEN);
+ }
+ /* the source MAC address */
+ if (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_SRC_MAC_ADDR)
+ memcpy(fake_hdr->saddr, &hdr->hdr.l3.dest_addr[2], TR_ALEN);
+ else
+ memset(fake_hdr->saddr, 0, TR_ALEN);
+ fake_hdr->rcf=0;
+ fake_llc = (struct trllc*)&(fake_hdr->rcf);
+ fake_llc->dsap = EXTENDED_SAP;
+ fake_llc->ssap = EXTENDED_SAP;
+ fake_llc->llc = UI_CMD;
+ fake_llc->protid[0] = 0;
+ fake_llc->protid[1] = 0;
+ fake_llc->protid[2] = 0;
+ fake_llc->ethertype = ETH_P_IP;
+}
+
+static inline void
+qeth_rebuild_skb_fake_ll_eth(struct qeth_card *card, struct sk_buff *skb,
struct qeth_hdr *hdr)
{
struct ethhdr *fake_hdr;
struct iphdr *ip_hdr;

- QETH_DBF_TEXT(trace,5,"skbfake");
- skb->mac.raw = skb->data - QETH_FAKE_LL_LEN;
+ QETH_DBF_TEXT(trace,5,"skbfketh");
+ skb->mac.raw = skb->data - QETH_FAKE_LL_LEN_ETH;
/* this is a fake ethernet header */
fake_hdr = (struct ethhdr *) skb->mac.raw;

@@ -2253,10 +2313,7 @@ qeth_rebuild_skb_fake_ll(struct qeth_car
#endif /* CONFIG_QETH_IPV6 */
case __constant_htons(ETH_P_IP):
ip_hdr = (struct iphdr *)skb->data;
- if (card->dev->type == ARPHRD_IEEE802_TR)
- ip_tr_mc_map(ip_hdr->daddr, fake_hdr->h_dest);
- else
- ip_eth_mc_map(ip_hdr->daddr, fake_hdr->h_dest);
+ ip_eth_mc_map(ip_hdr->daddr, fake_hdr->h_dest);
break;
default:
memcpy(fake_hdr->h_dest, card->dev->dev_addr, ETH_ALEN);
@@ -2278,6 +2335,16 @@ qeth_rebuild_skb_fake_ll(struct qeth_car
}

static inline void
+qeth_rebuild_skb_fake_ll(struct qeth_card *card, struct sk_buff *skb,
+ struct qeth_hdr *hdr)
+{
+ if (card->dev->type == ARPHRD_IEEE802_TR)
+ qeth_rebuild_skb_fake_ll_tr(card, skb, hdr);
+ else
+ qeth_rebuild_skb_fake_ll_eth(card, skb, hdr);
+}
+
+static inline void
qeth_rebuild_skb_vlan(struct qeth_card *card, struct sk_buff *skb,
struct qeth_hdr *hdr)
{
@@ -3440,16 +3507,25 @@ qeth_fake_header(struct sk_buff *skb, st
unsigned short type, void *daddr, void *saddr,
unsigned len)
{
- struct ethhdr *hdr;
+ if(dev->type == ARPHRD_IEEE802_TR){
+ struct trh_hdr *hdr;
+ hdr = (struct trh_hdr *)skb_push(skb, QETH_FAKE_LL_LEN_TR);
+ memcpy(hdr->saddr, dev->dev_addr, TR_ALEN);
+ memcpy(hdr->daddr, "FAKELL", TR_ALEN);
+ return QETH_FAKE_LL_LEN_TR;
+
+ } else {
+ struct ethhdr *hdr;
+ hdr = (struct ethhdr *)skb_push(skb, QETH_FAKE_LL_LEN_ETH);
+ memcpy(hdr->h_source, dev->dev_addr, ETH_ALEN);
+ memcpy(hdr->h_dest, "FAKELL", ETH_ALEN);
+ if (type != ETH_P_802_3)
+ hdr->h_proto = htons(type);
+ else
+ hdr->h_proto = htons(len);
+ return QETH_FAKE_LL_LEN_ETH;

- hdr = (struct ethhdr *)skb_push(skb, QETH_FAKE_LL_LEN);
- memcpy(hdr->h_source, dev->dev_addr, ETH_ALEN);
- memcpy(hdr->h_dest, "FAKELL", ETH_ALEN);
- if (type != ETH_P_802_3)
- hdr->h_proto = htons(type);
- else
- hdr->h_proto = htons(len);
- return QETH_FAKE_LL_LEN;
+ }
}

static inline int
@@ -3882,9 +3958,15 @@ qeth_fill_header(struct qeth_card *card,
memcpy(hdr->hdr.l3.dest_addr, &skb->nh.ipv6h->daddr, 16);
}
} else { /* passthrough */
- if (!memcmp(skb->data + sizeof(struct qeth_hdr),
+ if((skb->dev->type == ARPHRD_IEEE802_TR) &&
+ !memcmp(skb->data + sizeof(struct qeth_hdr) + 2,
+ skb->dev->broadcast, 6)) {
+ hdr->hdr.l3.flags = QETH_CAST_BROADCAST |
+ QETH_HDR_PASSTHRU;
+ } else if (!memcmp(skb->data + sizeof(struct qeth_hdr),
skb->dev->broadcast, 6)) { /* broadcast? */
- hdr->hdr.l3.flags = QETH_CAST_BROADCAST | QETH_HDR_PASSTHRU;
+ hdr->hdr.l3.flags = QETH_CAST_BROADCAST |
+ QETH_HDR_PASSTHRU;
} else {
hdr->hdr.l3.flags = (cast_type == RTN_MULTICAST) ?
QETH_CAST_MULTICAST | QETH_HDR_PASSTHRU :
@@ -4164,7 +4246,11 @@ qeth_send_packet(struct qeth_card *card,
dev_kfree_skb_irq(skb);
return 0;
}
- skb_pull(skb, QETH_FAKE_LL_LEN);
+ if(card->dev->type == ARPHRD_IEEE802_TR){
+ skb_pull(skb, QETH_FAKE_LL_LEN_TR);
+ } else {
+ skb_pull(skb, QETH_FAKE_LL_LEN_ETH);
+ }
}
}
cast_type = qeth_get_cast_type(card, skb);
-
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