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s390/qeth: remove locking for RX modeset cache

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The L2 and L3 .ndo_set_rx_mode callbacks maintain an address cache
to decide which addresses have changed since the last modeset.

When the card is set offline, qeth_l?_stop_card() drains this cache.
This happens only after 1) the net_device has been detached, and
2) any pending RX modeset has completed. Consequently we can access the
cache lock-free.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-03-28 16:39:20 +01:00 committed by David S. Miller
parent d0c7482566
commit 5c0aebc6db
4 changed files with 0 additions and 14 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -775,7 +775,6 @@ struct qeth_card {
struct workqueue_struct *event_wq;
wait_queue_head_t wait_q;
spinlock_t mclock;
unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
DECLARE_HASHTABLE(mac_htable, 4);
DECLARE_HASHTABLE(ip_htable, 4);

1
drivers/s390/net/qeth_core_main.c
View File

@ -1409,7 +1409,6 @@ static void qeth_setup_card(struct qeth_card *card)
card->info.type = CARD_RDEV(card)->id.driver_info;
card->state = CARD_STATE_DOWN;
spin_lock_init(&card->mclock);
spin_lock_init(&card->lock);
spin_lock_init(&card->ip_lock);
spin_lock_init(&card->thread_mask_lock);

6
drivers/s390/net/qeth_l2_main.c
View File

@ -155,12 +155,10 @@ static void qeth_l2_drain_rx_mode_cache(struct qeth_card *card)
struct hlist_node *tmp;
int i;
spin_lock_bh(&card->mclock);
hash_for_each_safe(card->mac_htable, i, tmp, mac, hnode) {
hash_del(&mac->hnode);
kfree(mac);
}
spin_unlock_bh(&card->mclock);
}
static int qeth_l2_get_cast_type(struct qeth_card *card, struct sk_buff *skb)
@ -530,8 +528,6 @@ static void qeth_l2_rx_mode_work(struct work_struct *work)
QETH_CARD_TEXT(card, 3, "setmulti");
spin_lock_bh(&card->mclock);
netif_addr_lock_bh(dev);
netdev_for_each_mc_addr(ha, dev)
qeth_l2_add_mac(card, ha);
@ -560,8 +556,6 @@ static void qeth_l2_rx_mode_work(struct work_struct *work)
}
}
spin_unlock_bh(&card->mclock);
if (qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE))
qeth_setadp_promisc_mode(card);
else

6
drivers/s390/net/qeth_l3_main.c
View File

@ -274,12 +274,10 @@ static void qeth_l3_drain_rx_mode_cache(struct qeth_card *card)
struct hlist_node *tmp;
int i;
spin_lock_bh(&card->mclock);
hash_for_each_safe(card->ip_mc_htable, i, tmp, addr, hnode) {
hash_del(&addr->hnode);
kfree(addr);
}
spin_unlock_bh(&card->mclock);
}
static void qeth_l3_clear_ip_htable(struct qeth_card *card, int recover)
@ -1484,8 +1482,6 @@ static void qeth_l3_rx_mode_work(struct work_struct *work)
QETH_CARD_TEXT(card, 3, "setmulti");
if (!card->options.sniffer) {
spin_lock_bh(&card->mclock);
qeth_l3_add_multicast_ipv4(card);
qeth_l3_add_multicast_ipv6(card);
@ -1513,8 +1509,6 @@ static void qeth_l3_rx_mode_work(struct work_struct *work)
}
}
spin_unlock_bh(&card->mclock);
if (!qeth_adp_supported(card, IPA_SETADP_SET_PROMISC_MODE))
return;
}