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Message-Id: <20210128112551.18780-3-jwi@linux.ibm.com>
Date: Thu, 28 Jan 2021 12:25:48 +0100
From: Julian Wiedmann <jwi@...ux.ibm.com>
To: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: linux-netdev <netdev@...r.kernel.org>,
linux-s390 <linux-s390@...r.kernel.org>,
Heiko Carstens <hca@...ux.ibm.com>,
Karsten Graul <kgraul@...ux.ibm.com>,
Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next 2/5] s390/qeth: remove qeth_get_ip_version()
Replace our home-grown helper with the more robust vlan_get_protocol().
This is pretty much a 1:1 replacement, we just need to pass around a
proper ETH_P_* everyhwere and convert the old value range.
For readability also convert the protocol checks in
qeth_l3_hard_start_xmit() to a switch statement.
Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
---
drivers/s390/net/qeth_core.h | 40 ++++++++-------------
drivers/s390/net/qeth_core_main.c | 18 +++++-----
drivers/s390/net/qeth_l2_main.c | 6 ++--
drivers/s390/net/qeth_l3_main.c | 60 ++++++++++++++++++-------------
4 files changed, 62 insertions(+), 62 deletions(-)
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 331dcbbf3e25..a1da83b0b0ef 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -956,24 +956,6 @@ static inline int qeth_get_elements_for_range(addr_t start, addr_t end)
return PFN_UP(end) - PFN_DOWN(start);
}
-static inline int qeth_get_ip_version(struct sk_buff *skb)
-{
- struct vlan_ethhdr *veth = vlan_eth_hdr(skb);
- __be16 prot = veth->h_vlan_proto;
-
- if (prot == htons(ETH_P_8021Q))
- prot = veth->h_vlan_encapsulated_proto;
-
- switch (prot) {
- case htons(ETH_P_IPV6):
- return 6;
- case htons(ETH_P_IP):
- return 4;
- default:
- return 0;
- }
-}
-
static inline int qeth_get_ether_cast_type(struct sk_buff *skb)
{
u8 *addr = eth_hdr(skb)->h_dest;
@@ -984,14 +966,20 @@ static inline int qeth_get_ether_cast_type(struct sk_buff *skb)
return RTN_UNICAST;
}
-static inline struct dst_entry *qeth_dst_check_rcu(struct sk_buff *skb, int ipv)
+static inline struct dst_entry *qeth_dst_check_rcu(struct sk_buff *skb,
+ __be16 proto)
{
struct dst_entry *dst = skb_dst(skb);
struct rt6_info *rt;
rt = (struct rt6_info *) dst;
- if (dst)
- dst = dst_check(dst, (ipv == 6) ? rt6_get_cookie(rt) : 0);
+ if (dst) {
+ if (proto == htons(ETH_P_IPV6))
+ dst = dst_check(dst, rt6_get_cookie(rt));
+ else
+ dst = dst_check(dst, 0);
+ }
+
return dst;
}
@@ -1014,11 +1002,11 @@ static inline struct in6_addr *qeth_next_hop_v6_rcu(struct sk_buff *skb,
return &ipv6_hdr(skb)->daddr;
}
-static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv)
+static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, __be16 proto)
{
*flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ;
- if ((ipv == 4 && ip_hdr(skb)->protocol == IPPROTO_UDP) ||
- (ipv == 6 && ipv6_hdr(skb)->nexthdr == IPPROTO_UDP))
+ if ((proto == htons(ETH_P_IP) && ip_hdr(skb)->protocol == IPPROTO_UDP) ||
+ (proto == htons(ETH_P_IPV6) && ipv6_hdr(skb)->nexthdr == IPPROTO_UDP))
*flags |= QETH_HDR_EXT_UDP;
}
@@ -1145,10 +1133,10 @@ int qeth_stop(struct net_device *dev);
int qeth_vm_request_mac(struct qeth_card *card);
int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
- struct qeth_qdio_out_q *queue, int ipv,
+ struct qeth_qdio_out_q *queue, __be16 proto,
void (*fill_header)(struct qeth_qdio_out_q *queue,
struct qeth_hdr *hdr, struct sk_buff *skb,
- int ipv, unsigned int data_len));
+ __be16 proto, unsigned int data_len));
/* exports for OSN */
int qeth_osn_assist(struct net_device *, void *, int);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 0a65213ab606..de9d27e1c529 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -825,7 +825,8 @@ static bool qeth_next_hop_is_local_v4(struct qeth_card *card,
return false;
rcu_read_lock();
- next_hop = qeth_next_hop_v4_rcu(skb, qeth_dst_check_rcu(skb, 4));
+ next_hop = qeth_next_hop_v4_rcu(skb,
+ qeth_dst_check_rcu(skb, htons(ETH_P_IP)));
key = ipv4_addr_hash(next_hop);
hash_for_each_possible_rcu(card->local_addrs4, tmp, hnode, key) {
@@ -851,7 +852,8 @@ static bool qeth_next_hop_is_local_v6(struct qeth_card *card,
return false;
rcu_read_lock();
- next_hop = qeth_next_hop_v6_rcu(skb, qeth_dst_check_rcu(skb, 6));
+ next_hop = qeth_next_hop_v6_rcu(skb,
+ qeth_dst_check_rcu(skb, htons(ETH_P_IPV6)));
key = ipv6_addr_hash(next_hop);
hash_for_each_possible_rcu(card->local_addrs6, tmp, hnode, key) {
@@ -3896,11 +3898,11 @@ int qeth_get_priority_queue(struct qeth_card *card, struct sk_buff *skb)
switch (card->qdio.do_prio_queueing) {
case QETH_PRIO_Q_ING_TOS:
case QETH_PRIO_Q_ING_PREC:
- switch (qeth_get_ip_version(skb)) {
- case 4:
+ switch (vlan_get_protocol(skb)) {
+ case htons(ETH_P_IP):
tos = ipv4_get_dsfield(ip_hdr(skb));
break;
- case 6:
+ case htons(ETH_P_IPV6):
tos = ipv6_get_dsfield(ipv6_hdr(skb));
break;
default:
@@ -4365,10 +4367,10 @@ static void qeth_fill_tso_ext(struct qeth_hdr_tso *hdr,
}
int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
- struct qeth_qdio_out_q *queue, int ipv,
+ struct qeth_qdio_out_q *queue, __be16 proto,
void (*fill_header)(struct qeth_qdio_out_q *queue,
struct qeth_hdr *hdr, struct sk_buff *skb,
- int ipv, unsigned int data_len))
+ __be16 proto, unsigned int data_len))
{
unsigned int proto_len, hw_hdr_len;
unsigned int frame_len = skb->len;
@@ -4401,7 +4403,7 @@ int qeth_xmit(struct qeth_card *card, struct sk_buff *skb,
data_offset = push_len + proto_len;
}
memset(hdr, 0, hw_hdr_len);
- fill_header(queue, hdr, skb, ipv, frame_len);
+ fill_header(queue, hdr, skb, proto, frame_len);
if (is_tso)
qeth_fill_tso_ext((struct qeth_hdr_tso *) hdr,
frame_len - proto_len, skb, proto_len);
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 4254caf1d9b6..ca44421a6d6e 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -157,7 +157,7 @@ static void qeth_l2_drain_rx_mode_cache(struct qeth_card *card)
static void qeth_l2_fill_header(struct qeth_qdio_out_q *queue,
struct qeth_hdr *hdr, struct sk_buff *skb,
- int ipv, unsigned int data_len)
+ __be16 proto, unsigned int data_len)
{
int cast_type = qeth_get_ether_cast_type(skb);
struct vlan_ethhdr *veth = vlan_eth_hdr(skb);
@@ -169,7 +169,7 @@ static void qeth_l2_fill_header(struct qeth_qdio_out_q *queue,
} else {
hdr->hdr.l2.id = QETH_HEADER_TYPE_LAYER2;
if (skb->ip_summed == CHECKSUM_PARTIAL)
- qeth_tx_csum(skb, &hdr->hdr.l2.flags[1], ipv);
+ qeth_tx_csum(skb, &hdr->hdr.l2.flags[1], proto);
}
/* set byte byte 3 to casting flags */
@@ -551,7 +551,7 @@ static netdev_tx_t qeth_l2_hard_start_xmit(struct sk_buff *skb,
if (IS_OSN(card))
rc = qeth_l2_xmit_osn(card, skb, queue);
else
- rc = qeth_xmit(card, skb, queue, qeth_get_ip_version(skb),
+ rc = qeth_xmit(card, skb, queue, vlan_get_protocol(skb),
qeth_l2_fill_header);
if (!rc)
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 4c2cae7ae9a7..7a7465376e29 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1576,7 +1576,7 @@ static int qeth_l3_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
}
static int qeth_l3_get_cast_type_rcu(struct sk_buff *skb, struct dst_entry *dst,
- int ipv)
+ __be16 proto)
{
struct neighbour *n = NULL;
@@ -1595,13 +1595,13 @@ static int qeth_l3_get_cast_type_rcu(struct sk_buff *skb, struct dst_entry *dst,
}
/* no neighbour (eg AF_PACKET), fall back to target's IP address ... */
- switch (ipv) {
- case 4:
+ switch (proto) {
+ case htons(ETH_P_IP):
if (ipv4_is_lbcast(ip_hdr(skb)->daddr))
return RTN_BROADCAST;
return ipv4_is_multicast(ip_hdr(skb)->daddr) ?
RTN_MULTICAST : RTN_UNICAST;
- case 6:
+ case htons(ETH_P_IPV6):
return ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ?
RTN_MULTICAST : RTN_UNICAST;
default:
@@ -1612,13 +1612,13 @@ static int qeth_l3_get_cast_type_rcu(struct sk_buff *skb, struct dst_entry *dst,
static int qeth_l3_get_cast_type(struct sk_buff *skb)
{
- int ipv = qeth_get_ip_version(skb);
+ __be16 proto = vlan_get_protocol(skb);
struct dst_entry *dst;
int cast_type;
rcu_read_lock();
- dst = qeth_dst_check_rcu(skb, ipv);
- cast_type = qeth_l3_get_cast_type_rcu(skb, dst, ipv);
+ dst = qeth_dst_check_rcu(skb, proto);
+ cast_type = qeth_l3_get_cast_type_rcu(skb, dst, proto);
rcu_read_unlock();
return cast_type;
@@ -1637,7 +1637,7 @@ static u8 qeth_l3_cast_type_to_flag(int cast_type)
static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
struct qeth_hdr *hdr, struct sk_buff *skb,
- int ipv, unsigned int data_len)
+ __be16 proto, unsigned int data_len)
{
struct qeth_hdr_layer3 *l3_hdr = &hdr->hdr.l3;
struct vlan_ethhdr *veth = vlan_eth_hdr(skb);
@@ -1652,7 +1652,7 @@ static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
} else {
hdr->hdr.l3.id = QETH_HEADER_TYPE_LAYER3;
- if (skb->protocol == htons(ETH_P_AF_IUCV)) {
+ if (proto == htons(ETH_P_AF_IUCV)) {
l3_hdr->flags = QETH_HDR_IPV6 | QETH_CAST_UNICAST;
l3_hdr->next_hop.addr.s6_addr16[0] = htons(0xfe80);
memcpy(&l3_hdr->next_hop.addr.s6_addr32[2],
@@ -1661,14 +1661,14 @@ static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
}
if (skb->ip_summed == CHECKSUM_PARTIAL) {
- qeth_tx_csum(skb, &hdr->hdr.l3.ext_flags, ipv);
+ qeth_tx_csum(skb, &hdr->hdr.l3.ext_flags, proto);
/* some HW requires combined L3+L4 csum offload: */
- if (ipv == 4)
+ if (proto == htons(ETH_P_IP))
hdr->hdr.l3.ext_flags |= QETH_HDR_EXT_CSUM_HDR_REQ;
}
}
- if (ipv == 4 || IS_IQD(card)) {
+ if (proto == htons(ETH_P_IP) || IS_IQD(card)) {
/* NETIF_F_HW_VLAN_CTAG_TX */
if (skb_vlan_tag_present(skb)) {
hdr->hdr.l3.ext_flags |= QETH_HDR_EXT_VLAN_FRAME;
@@ -1680,18 +1680,18 @@ static void qeth_l3_fill_header(struct qeth_qdio_out_q *queue,
}
rcu_read_lock();
- dst = qeth_dst_check_rcu(skb, ipv);
+ dst = qeth_dst_check_rcu(skb, proto);
if (IS_IQD(card) && skb_get_queue_mapping(skb) != QETH_IQD_MCAST_TXQ)
cast_type = RTN_UNICAST;
else
- cast_type = qeth_l3_get_cast_type_rcu(skb, dst, ipv);
+ cast_type = qeth_l3_get_cast_type_rcu(skb, dst, proto);
l3_hdr->flags |= qeth_l3_cast_type_to_flag(cast_type);
- if (ipv == 4) {
+ if (proto == htons(ETH_P_IP)) {
l3_hdr->next_hop.addr.s6_addr32[3] =
qeth_next_hop_v4_rcu(skb, dst);
- } else if (ipv == 6) {
+ } else if (proto == htons(ETH_P_IPV6)) {
l3_hdr->next_hop.addr = *qeth_next_hop_v6_rcu(skb, dst);
hdr->hdr.l3.flags |= QETH_HDR_IPV6;
@@ -1719,7 +1719,7 @@ static void qeth_l3_fixup_headers(struct sk_buff *skb)
}
static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,
- struct qeth_qdio_out_q *queue, int ipv)
+ struct qeth_qdio_out_q *queue, __be16 proto)
{
unsigned int hw_hdr_len;
int rc;
@@ -1733,15 +1733,15 @@ static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,
skb_pull(skb, ETH_HLEN);
qeth_l3_fixup_headers(skb);
- return qeth_xmit(card, skb, queue, ipv, qeth_l3_fill_header);
+ return qeth_xmit(card, skb, queue, proto, qeth_l3_fill_header);
}
static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct qeth_card *card = dev->ml_priv;
+ __be16 proto = vlan_get_protocol(skb);
u16 txq = skb_get_queue_mapping(skb);
- int ipv = qeth_get_ip_version(skb);
struct qeth_qdio_out_q *queue;
int rc;
@@ -1752,10 +1752,20 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
if (card->options.sniffer)
goto tx_drop;
- if ((card->options.cq != QETH_CQ_ENABLED && !ipv) ||
- (card->options.cq == QETH_CQ_ENABLED &&
- skb->protocol != htons(ETH_P_AF_IUCV)))
+
+ switch (proto) {
+ case htons(ETH_P_AF_IUCV):
+ if (card->options.cq != QETH_CQ_ENABLED)
+ goto tx_drop;
+ break;
+ case htons(ETH_P_IP):
+ case htons(ETH_P_IPV6):
+ if (card->options.cq == QETH_CQ_ENABLED)
+ goto tx_drop;
+ break;
+ default:
goto tx_drop;
+ }
} else {
queue = card->qdio.out_qs[txq];
}
@@ -1764,10 +1774,10 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,
qeth_l3_get_cast_type(skb) == RTN_BROADCAST)
goto tx_drop;
- if (ipv == 4 || IS_IQD(card))
- rc = qeth_l3_xmit(card, skb, queue, ipv);
+ if (proto == htons(ETH_P_IP) || IS_IQD(card))
+ rc = qeth_l3_xmit(card, skb, queue, proto);
else
- rc = qeth_xmit(card, skb, queue, ipv, qeth_l3_fill_header);
+ rc = qeth_xmit(card, skb, queue, proto, qeth_l3_fill_header);
if (!rc)
return NETDEV_TX_OK;
--
2.17.1
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