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Message-Id: <20200420075426.31462-3-maorg@mellanox.com>
Date: Mon, 20 Apr 2020 10:54:18 +0300
From: Maor Gottlieb <maorg@...lanox.com>
To: davem@...emloft.net, jgg@...lanox.com, dledford@...hat.com,
j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
kuba@...nel.org
Cc: leonro@...lanox.com, saeedm@...lanox.com, jiri@...lanox.com,
linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
alexr@...lanox.com, Maor Gottlieb <maorg@...lanox.com>
Subject: [PATCH V2 mlx5-next 02/10] bonding: Rename slave_arr to usable_slaves
This patch renames slave_arr to usable_slaves, since we will
have two arrays, one for the usable slaves and the other to all
slaves. In addition, exports the bond_skip_slave logic to function.
Signed-off-by: Maor Gottlieb <maorg@...lanox.com>
---
drivers/net/bonding/bond_alb.c | 4 +-
drivers/net/bonding/bond_main.c | 85 +++++++++++++++++----------------
include/net/bonding.h | 2 +-
3 files changed, 48 insertions(+), 43 deletions(-)
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index c81698550e5a..7bb49b049dcc 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1360,7 +1360,7 @@ netdev_tx_t bond_tlb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
struct bond_up_slave *slaves;
unsigned int count;
- slaves = rcu_dereference(bond->slave_arr);
+ slaves = rcu_dereference(bond->usable_slaves);
count = slaves ? READ_ONCE(slaves->count) : 0;
if (likely(count))
tx_slave = slaves->arr[hash_index %
@@ -1494,7 +1494,7 @@ netdev_tx_t bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
struct bond_up_slave *slaves;
unsigned int count;
- slaves = rcu_dereference(bond->slave_arr);
+ slaves = rcu_dereference(bond->usable_slaves);
count = slaves ? READ_ONCE(slaves->count) : 0;
if (likely(count))
tx_slave = slaves->arr[bond_xmit_hash(bond, skb) %
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2e70e43c5df5..2cb41d480ae2 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4087,6 +4087,29 @@ static void bond_slave_arr_handler(struct work_struct *work)
bond_slave_arr_work_rearm(bond, 1);
}
+static void bond_skip_slave(struct bond_up_slave *slaves,
+ struct slave *skipslave)
+{
+ int idx;
+
+ /* Rare situation where caller has asked to skip a specific
+ * slave but allocation failed (most likely!). BTW this is
+ * only possible when the call is initiated from
+ * __bond_release_one(). In this situation; overwrite the
+ * skipslave entry in the array with the last entry from the
+ * array to avoid a situation where the xmit path may choose
+ * this to-be-skipped slave to send a packet out.
+ */
+ for (idx = 0; slaves && idx < slaves->count; idx++) {
+ if (skipslave == slaves->arr[idx]) {
+ slaves->arr[idx] =
+ slaves->arr[slaves->count - 1];
+ slaves->count--;
+ break;
+ }
+ }
+}
+
/* Build the usable slaves array in control path for modes that use xmit-hash
* to determine the slave interface -
* (a) BOND_MODE_8023AD
@@ -4097,9 +4120,9 @@ static void bond_slave_arr_handler(struct work_struct *work)
*/
int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
{
+ struct bond_up_slave *usable_slaves, *old_usable_slaves;
struct slave *slave;
struct list_head *iter;
- struct bond_up_slave *new_arr, *old_arr;
int agg_id = 0;
int ret = 0;
@@ -4107,11 +4130,10 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
WARN_ON(lockdep_is_held(&bond->mode_lock));
#endif
- new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
- GFP_KERNEL);
- if (!new_arr) {
+ usable_slaves = kzalloc(struct_size(usable_slaves, arr,
+ bond->slave_cnt), GFP_KERNEL);
+ if (!usable_slaves) {
ret = -ENOMEM;
- pr_err("Failed to build slave-array.\n");
goto out;
}
if (BOND_MODE(bond) == BOND_MODE_8023AD) {
@@ -4119,14 +4141,14 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
pr_debug("bond_3ad_get_active_agg_info failed\n");
- kfree_rcu(new_arr, rcu);
+ kfree_rcu(usable_slaves, rcu);
/* No active aggragator means it's not safe to use
* the previous array.
*/
- old_arr = rtnl_dereference(bond->slave_arr);
- if (old_arr) {
- RCU_INIT_POINTER(bond->slave_arr, NULL);
- kfree_rcu(old_arr, rcu);
+ old_usable_slaves = rtnl_dereference(bond->usable_slaves);
+ if (old_usable_slaves) {
+ RCU_INIT_POINTER(bond->usable_slaves, NULL);
+ kfree_rcu(old_usable_slaves, rcu);
}
goto out;
}
@@ -4146,37 +4168,20 @@ int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
continue;
slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
- new_arr->count);
+ usable_slaves->count);
- new_arr->arr[new_arr->count++] = slave;
+ usable_slaves->arr[usable_slaves->count++] = slave;
}
- old_arr = rtnl_dereference(bond->slave_arr);
- rcu_assign_pointer(bond->slave_arr, new_arr);
- if (old_arr)
- kfree_rcu(old_arr, rcu);
+ old_usable_slaves = rtnl_dereference(bond->usable_slaves);
+ rcu_assign_pointer(bond->usable_slaves, usable_slaves);
+ if (old_usable_slaves)
+ kfree_rcu(old_usable_slaves, rcu);
out:
- if (ret != 0 && skipslave) {
- int idx;
-
- /* Rare situation where caller has asked to skip a specific
- * slave but allocation failed (most likely!). BTW this is
- * only possible when the call is initiated from
- * __bond_release_one(). In this situation; overwrite the
- * skipslave entry in the array with the last entry from the
- * array to avoid a situation where the xmit path may choose
- * this to-be-skipped slave to send a packet out.
- */
- old_arr = rtnl_dereference(bond->slave_arr);
- for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
- if (skipslave == old_arr->arr[idx]) {
- old_arr->arr[idx] =
- old_arr->arr[old_arr->count-1];
- old_arr->count--;
- break;
- }
- }
- }
+ if (ret != 0 && skipslave)
+ bond_skip_slave(rtnl_dereference(bond->usable_slaves),
+ skipslave);
+
return ret;
}
@@ -4192,7 +4197,7 @@ static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
struct bond_up_slave *slaves;
unsigned int count;
- slaves = rcu_dereference(bond->slave_arr);
+ slaves = rcu_dereference(bond->usable_slaves);
count = slaves ? READ_ONCE(slaves->count) : 0;
if (likely(count)) {
slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
@@ -4483,9 +4488,9 @@ static void bond_uninit(struct net_device *bond_dev)
__bond_release_one(bond_dev, slave->dev, true, true);
netdev_info(bond_dev, "Released all slaves\n");
- arr = rtnl_dereference(bond->slave_arr);
+ arr = rtnl_dereference(bond->usable_slaves);
if (arr) {
- RCU_INIT_POINTER(bond->slave_arr, NULL);
+ RCU_INIT_POINTER(bond->usable_slaves, NULL);
kfree_rcu(arr, rcu);
}
diff --git a/include/net/bonding.h b/include/net/bonding.h
index dc2ce31a1f52..33bdb6d5182d 100644
--- a/include/net/bonding.h
+++ b/include/net/bonding.h
@@ -200,7 +200,7 @@ struct bonding {
struct slave __rcu *curr_active_slave;
struct slave __rcu *current_arp_slave;
struct slave __rcu *primary_slave;
- struct bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
+ struct bond_up_slave __rcu *usable_slaves; /* Array of usable slaves */
bool force_primary;
s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
int (*recv_probe)(const struct sk_buff *, struct bonding *,
--
2.17.2
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