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s390/qeth: unionize next-hop field in qeth L3 header

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The L3 packet descriptor's 'dest_addr' field is used for a different
purpose in RX descriptors. Clean up the hard-coded byte accesses and
try to be more self-documenting.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2017-12-20 20:11:06 +01:00 committed by David S. Miller
parent a65d141043
commit a843383a3e
2 changed files with 23 additions and 8 deletions
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19
drivers/s390/net/qeth_core.h
View File

@ -297,8 +297,23 @@ struct qeth_hdr_layer3 {
__u8 ext_flags;
__u16 vlan_id;
__u16 frame_offset;
__u8 dest_addr[16];
} __attribute__ ((packed));
union {
/* TX: */
u8 ipv6_addr[16];
struct ipv4 {
u8 res[12];
u32 addr;
} ipv4;
/* RX: */
struct rx {
u8 res1[2];
u8 src_mac[6];
u8 res2[4];
u16 vlan_id;
u8 res3[2];
} rx;
} next_hop;
};
struct qeth_hdr_layer2 {
__u8 id;

12
drivers/s390/net/qeth_l3_main.c
View File

@ -1637,7 +1637,7 @@ static void qeth_l3_rebuild_skb(struct qeth_card *card, struct sk_buff *skb,
}
if (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_SRC_MAC_ADDR)
card->dev->header_ops->create(skb, card->dev, prot,
tg_addr, &hdr->hdr.l3.dest_addr[2],
tg_addr, &hdr->hdr.l3.next_hop.rx.src_mac,
card->dev->addr_len);
else
card->dev->header_ops->create(skb, card->dev, prot,
@ -1652,7 +1652,7 @@ static void qeth_l3_rebuild_skb(struct qeth_card *card, struct sk_buff *skb,
QETH_HDR_EXT_INCLUDE_VLAN_TAG))) {
u16 tag = (hdr->hdr.l3.ext_flags & QETH_HDR_EXT_VLAN_FRAME) ?
hdr->hdr.l3.vlan_id :
*((u16 *)&hdr->hdr.l3.dest_addr[12]);
hdr->hdr.l3.next_hop.rx.vlan_id;
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), tag);
}
@ -2408,7 +2408,7 @@ static void qeth_l3_fill_af_iucv_hdr(struct qeth_card *card,
daddr[0] = 0xfe;
daddr[1] = 0x80;
memcpy(&daddr[8], iucv_hdr->destUserID, 8);
memcpy(hdr->hdr.l3.dest_addr, daddr, 16);
memcpy(hdr->hdr.l3.next_hop.ipv6_addr, daddr, 16);
}
static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
@ -2445,8 +2445,8 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
/* IPv4 */
hdr->hdr.l3.flags = qeth_l3_get_qeth_hdr_flags4(cast_type);
memset(hdr->hdr.l3.dest_addr, 0, 12);
*((__be32 *) (&hdr->hdr.l3.dest_addr[12])) = *pkey;
memset(hdr->hdr.l3.next_hop.ipv4.res, 0, 12);
*((__be32 *) &hdr->hdr.l3.next_hop.ipv4.addr) = *pkey;
} else if (ipv == 6) {
struct rt6_info *rt = (struct rt6_info *) dst;
struct in6_addr *pkey = &ipv6_hdr(skb)->daddr;
@ -2458,7 +2458,7 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
hdr->hdr.l3.flags = qeth_l3_get_qeth_hdr_flags6(cast_type);
if (card->info.type == QETH_CARD_TYPE_IQD)
hdr->hdr.l3.flags &= ~QETH_HDR_PASSTHRU;
memcpy(hdr->hdr.l3.dest_addr, pkey, 16);
memcpy(hdr->hdr.l3.next_hop.ipv6_addr, pkey, 16);
} else {
if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest,
skb->dev->broadcast)) {