From: Julian Wiedmann <jwi@linux.ibm.com>
Subject: s390/qeth: restructure IP notification handlers
Patch-mainline: v4.17-rc1
Git-commit: d66b1c0df3f19812a6edb69fa35a1db01a2251d5
References: FATE#326350, LTC#169511, bsc#1113509
Summary: qeth: performance improvements
Description: This adds recent functional and performance improvements for the
qeth network driver.
Primarily this brings Scatter-Gather support for HiperSockets,
reduced CPU consumption in the L3 IPv4 transmit path for OSA,
improved Promiscuous Mode performance due to IFF_UNICAST_FLT,
support for Scatter-Gather on z/VM virtual NICs, and
support for delayed GRO flushing.
For sanity & stability reasons, this effectively constitutes a
backport of the qeth device driver from 4.19 mainline.
Upstream-Description:
s390/qeth: restructure IP notification handlers
Extract a helper that does the actual work & returns the right NOTIFY_*
responses, and start putting the temporary ipaddr container objects
on the stack rather than kmalloc'ing them. They are small, and this
reduces the confusion of which objects actually get added to qeth's
IP tables.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/s390/net/qeth_l3.h | 10 +++
drivers/s390/net/qeth_l3_main.c | 102 +++++++++++++++-------------------------
2 files changed, 49 insertions(+), 63 deletions(-)
--- a/drivers/s390/net/qeth_l3.h
+++ b/drivers/s390/net/qeth_l3.h
@@ -41,6 +41,16 @@ struct qeth_ipaddr {
} u;
};
+static inline void qeth_l3_init_ipaddr(struct qeth_ipaddr *addr,
+ enum qeth_ip_types type,
+ enum qeth_prot_versions proto)
+{
+ memset(addr, 0, sizeof(*addr));
+ addr->type = type;
+ addr->proto = proto;
+ addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
+}
+
static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1,
struct qeth_ipaddr *a2)
{
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -66,6 +66,15 @@ void qeth_l3_ipaddr_to_string(enum qeth_
qeth_l3_ipaddr6_to_string(addr, buf);
}
+struct qeth_ipaddr *qeth_l3_get_addr_buffer(enum qeth_prot_versions prot)
+{
+ struct qeth_ipaddr *addr = kmalloc(sizeof(*addr), GFP_ATOMIC);
+
+ if (addr)
+ qeth_l3_init_ipaddr(addr, QETH_IP_TYPE_NORMAL, prot);
+ return addr;
+}
+
static struct qeth_ipaddr *qeth_l3_find_addr_by_ip(struct qeth_card *card,
struct qeth_ipaddr *query)
{
@@ -251,23 +260,6 @@ int qeth_l3_add_ip(struct qeth_card *car
return rc;
}
-
-struct qeth_ipaddr *qeth_l3_get_addr_buffer(
- enum qeth_prot_versions prot)
-{
- struct qeth_ipaddr *addr;
-
- addr = kzalloc(sizeof(struct qeth_ipaddr), GFP_ATOMIC);
- if (!addr)
- return NULL;
-
- addr->type = QETH_IP_TYPE_NORMAL;
- addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
- addr->proto = prot;
-
- return addr;
-}
-
static void qeth_l3_clear_ip_htable(struct qeth_card *card, int recover)
{
struct qeth_ipaddr *addr;
@@ -3127,13 +3119,33 @@ struct qeth_discipline qeth_l3_disciplin
};
EXPORT_SYMBOL_GPL(qeth_l3_discipline);
+static int qeth_l3_handle_ip_event(struct qeth_card *card,
+ struct qeth_ipaddr *addr,
+ unsigned long event)
+{
+ switch (event) {
+ case NETDEV_UP:
+ spin_lock_bh(&card->ip_lock);
+ qeth_l3_add_ip(card, addr);
+ spin_unlock_bh(&card->ip_lock);
+ return NOTIFY_OK;
+ case NETDEV_DOWN:
+ spin_lock_bh(&card->ip_lock);
+ qeth_l3_delete_ip(card, addr);
+ spin_unlock_bh(&card->ip_lock);
+ return NOTIFY_OK;
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
static int qeth_l3_ip_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
struct net_device *dev = (struct net_device *)ifa->ifa_dev->dev;
- struct qeth_ipaddr *addr;
+ struct qeth_ipaddr addr;
struct qeth_card *card;
if (dev_net(dev) != &init_net)
@@ -3144,29 +3156,11 @@ static int qeth_l3_ip_event(struct notif
return NOTIFY_DONE;
QETH_CARD_TEXT(card, 3, "ipevent");
- addr = qeth_l3_get_addr_buffer(QETH_PROT_IPV4);
- if (addr) {
- addr->u.a4.addr = be32_to_cpu(ifa->ifa_address);
- addr->u.a4.mask = be32_to_cpu(ifa->ifa_mask);
- addr->type = QETH_IP_TYPE_NORMAL;
- } else
- return NOTIFY_DONE;
-
- switch (event) {
- case NETDEV_UP:
- spin_lock_bh(&card->ip_lock);
- qeth_l3_add_ip(card, addr);
- spin_unlock_bh(&card->ip_lock);
- break;
- case NETDEV_DOWN:
- spin_lock_bh(&card->ip_lock);
- qeth_l3_delete_ip(card, addr);
- spin_unlock_bh(&card->ip_lock);
- break;
- }
+ qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV4);
+ addr.u.a4.addr = be32_to_cpu(ifa->ifa_address);
+ addr.u.a4.mask = be32_to_cpu(ifa->ifa_mask);
- kfree(addr);
- return NOTIFY_DONE;
+ return qeth_l3_handle_ip_event(card, &addr, event);
}
static struct notifier_block qeth_l3_ip_notifier = {
@@ -3179,7 +3173,7 @@ static int qeth_l3_ip6_event(struct noti
{
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct net_device *dev = (struct net_device *)ifa->idev->dev;
- struct qeth_ipaddr *addr;
+ struct qeth_ipaddr addr;
struct qeth_card *card;
card = qeth_l3_get_card_from_dev(dev);
@@ -3189,29 +3183,11 @@ static int qeth_l3_ip6_event(struct noti
if (!qeth_is_supported(card, IPA_IPV6))
return NOTIFY_DONE;
- addr = qeth_l3_get_addr_buffer(QETH_PROT_IPV6);
- if (addr) {
- memcpy(&addr->u.a6.addr, &ifa->addr, sizeof(struct in6_addr));
- addr->u.a6.pfxlen = ifa->prefix_len;
- addr->type = QETH_IP_TYPE_NORMAL;
- } else
- return NOTIFY_DONE;
-
- switch (event) {
- case NETDEV_UP:
- spin_lock_bh(&card->ip_lock);
- qeth_l3_add_ip(card, addr);
- spin_unlock_bh(&card->ip_lock);
- break;
- case NETDEV_DOWN:
- spin_lock_bh(&card->ip_lock);
- qeth_l3_delete_ip(card, addr);
- spin_unlock_bh(&card->ip_lock);
- break;
- }
+ qeth_l3_init_ipaddr(&addr, QETH_IP_TYPE_NORMAL, QETH_PROT_IPV6);
+ addr.u.a6.addr = ifa->addr;
+ addr.u.a6.pfxlen = ifa->prefix_len;
- kfree(addr);
- return NOTIFY_DONE;
+ return qeth_l3_handle_ip_event(card, &addr, event);
}
static struct notifier_block qeth_l3_ip6_notifier = {