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authorRoopa Prabhu <roopa@cumulusnetworks.com>2016-08-30 21:56:45 -0700
committerDavid S. Miller <davem@davemloft.net>2016-09-01 16:56:15 -0700
commitd297653dd6f07afbe7e6c702a4bcd7615680002e (patch)
treee1db2aa802f30afcb2849e8b5a4a2c12866d86d0
parentrps: flow_dissector: Add the const for the parameter of flow_keys_have_l4 (diff)
downloadlinux-dev-d297653dd6f07afbe7e6c702a4bcd7615680002e.tar.xz
linux-dev-d297653dd6f07afbe7e6c702a4bcd7615680002e.zip
rtnetlink: fdb dump: optimize by saving last interface markers
fdb dumps spanning multiple skb's currently restart from the first interface again for every skb. This results in unnecessary iterations on the already visited interfaces and their fdb entries. In large scale setups, we have seen this to slow down fdb dumps considerably. On a system with 30k macs we see fdb dumps spanning across more than 300 skbs. To fix the problem, this patch replaces the existing single fdb marker with three markers: netdev hash entries, netdevs and fdb index to continue where we left off instead of restarting from the first netdev. This is consistent with link dumps. In the process of fixing the performance issue, this patch also re-implements fix done by commit 472681d57a5d ("net: ndo_fdb_dump should report -EMSGSIZE to rtnl_fdb_dump") (with an internal fix from Wilson Kok) in the following ways: - change ndo_fdb_dump handlers to return error code instead of the last fdb index - use cb->args strictly for dump frag markers and not error codes. This is consistent with other dump functions. Below results were taken on a system with 1000 netdevs and 35085 fdb entries: before patch: $time bridge fdb show | wc -l 15065 real 1m11.791s user 0m0.070s sys 1m8.395s (existing code does not return all macs) after patch: $time bridge fdb show | wc -l 35085 real 0m2.017s user 0m0.113s sys 0m1.942s Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: Wilson Kok <wkok@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c7
-rw-r--r--drivers/net/vxlan.c14
-rw-r--r--include/linux/netdevice.h4
-rw-r--r--include/linux/rtnetlink.h2
-rw-r--r--include/net/switchdev.h4
-rw-r--r--net/bridge/br_fdb.c23
-rw-r--r--net/bridge/br_private.h2
-rw-r--r--net/core/rtnetlink.c105
-rw-r--r--net/switchdev/switchdev.c10
9 files changed, 98 insertions, 73 deletions
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 3ebef27e0964..3ae3968b0edf 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -432,18 +432,19 @@ static int qlcnic_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
static int qlcnic_fdb_dump(struct sk_buff *skb, struct netlink_callback *ncb,
struct net_device *netdev,
- struct net_device *filter_dev, int idx)
+ struct net_device *filter_dev, int *idx)
{
struct qlcnic_adapter *adapter = netdev_priv(netdev);
+ int err = 0;
if (!adapter->fdb_mac_learn)
return ndo_dflt_fdb_dump(skb, ncb, netdev, filter_dev, idx);
if ((adapter->flags & QLCNIC_ESWITCH_ENABLED) ||
qlcnic_sriov_check(adapter))
- idx = ndo_dflt_fdb_dump(skb, ncb, netdev, filter_dev, idx);
+ err = ndo_dflt_fdb_dump(skb, ncb, netdev, filter_dev, idx);
- return idx;
+ return err;
}
static void qlcnic_82xx_cancel_idc_work(struct qlcnic_adapter *adapter)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 3f7e0d2dd21a..f605a3684a7f 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -860,20 +860,20 @@ out:
/* Dump forwarding table */
static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
- struct net_device *filter_dev, int idx)
+ struct net_device *filter_dev, int *idx)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
unsigned int h;
+ int err = 0;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct vxlan_fdb *f;
- int err;
hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
struct vxlan_rdst *rd;
list_for_each_entry_rcu(rd, &f->remotes, list) {
- if (idx < cb->args[0])
+ if (*idx < cb->args[2])
goto skip;
err = vxlan_fdb_info(skb, vxlan, f,
@@ -881,17 +881,15 @@ static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
cb->nlh->nlmsg_seq,
RTM_NEWNEIGH,
NLM_F_MULTI, rd);
- if (err < 0) {
- cb->args[1] = err;
+ if (err < 0)
goto out;
- }
skip:
- ++idx;
+ *idx += 1;
}
}
}
out:
- return idx;
+ return err;
}
/* Watch incoming packets to learn mapping between Ethernet address
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d122be9345c7..67bb978470dc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1031,7 +1031,7 @@ struct netdev_xdp {
* Deletes the FDB entry from dev coresponding to addr.
* int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
* struct net_device *dev, struct net_device *filter_dev,
- * int idx)
+ * int *idx)
* Used to add FDB entries to dump requests. Implementers should add
* entries to skb and update idx with the number of entries.
*
@@ -1263,7 +1263,7 @@ struct net_device_ops {
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
- int idx);
+ int *idx);
int (*ndo_bridge_setlink)(struct net_device *dev,
struct nlmsghdr *nlh,
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 2daece8979f7..57e54847b0b9 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -105,7 +105,7 @@ extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
- int idx);
+ int *idx);
extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
struct nlattr *tb[],
struct net_device *dev,
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 82f5e0462021..6279f2f179ec 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -222,7 +222,7 @@ int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
u16 vid);
int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
- struct net_device *filter_dev, int idx);
+ struct net_device *filter_dev, int *idx);
void switchdev_port_fwd_mark_set(struct net_device *dev,
struct net_device *group_dev,
bool joining);
@@ -342,7 +342,7 @@ static inline int switchdev_port_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
- int idx)
+ int *idx)
{
return idx;
}
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index cd620fab41b0..6b43c8c88f19 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -710,24 +710,27 @@ int br_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
- int idx)
+ int *idx)
{
struct net_bridge *br = netdev_priv(dev);
+ int err = 0;
int i;
if (!(dev->priv_flags & IFF_EBRIDGE))
goto out;
- if (!filter_dev)
- idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
+ if (!filter_dev) {
+ err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
+ if (err < 0)
+ goto out;
+ }
for (i = 0; i < BR_HASH_SIZE; i++) {
struct net_bridge_fdb_entry *f;
hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
- int err;
- if (idx < cb->args[0])
+ if (*idx < cb->args[2])
goto skip;
if (filter_dev &&
@@ -750,17 +753,15 @@ int br_fdb_dump(struct sk_buff *skb,
cb->nlh->nlmsg_seq,
RTM_NEWNEIGH,
NLM_F_MULTI);
- if (err < 0) {
- cb->args[1] = err;
- break;
- }
+ if (err < 0)
+ goto out;
skip:
- ++idx;
+ *idx += 1;
}
}
out:
- return idx;
+ return err;
}
/* Update (create or replace) forwarding database entry */
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2379b2b865c9..3d36493f4487 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -508,7 +508,7 @@ int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
const unsigned char *addr, u16 vid, u16 nlh_flags);
int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
- struct net_device *dev, struct net_device *fdev, int idx);
+ struct net_device *dev, struct net_device *fdev, int *idx);
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 318fc5231b2b..1dfca1c3f8f5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3068,7 +3068,7 @@ static int nlmsg_populate_fdb(struct sk_buff *skb,
seq = cb->nlh->nlmsg_seq;
list_for_each_entry(ha, &list->list, list) {
- if (*idx < cb->args[0])
+ if (*idx < cb->args[2])
goto skip;
err = nlmsg_populate_fdb_fill(skb, dev, ha->addr, 0,
@@ -3095,19 +3095,18 @@ int ndo_dflt_fdb_dump(struct sk_buff *skb,
struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev,
- int idx)
+ int *idx)
{
int err;
netif_addr_lock_bh(dev);
- err = nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->uc);
+ err = nlmsg_populate_fdb(skb, cb, dev, idx, &dev->uc);
if (err)
goto out;
- nlmsg_populate_fdb(skb, cb, dev, &idx, &dev->mc);
+ nlmsg_populate_fdb(skb, cb, dev, idx, &dev->mc);
out:
netif_addr_unlock_bh(dev);
- cb->args[1] = err;
- return idx;
+ return err;
}
EXPORT_SYMBOL(ndo_dflt_fdb_dump);
@@ -3120,9 +3119,13 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
const struct net_device_ops *cops = NULL;
struct ifinfomsg *ifm = nlmsg_data(cb->nlh);
struct net *net = sock_net(skb->sk);
+ struct hlist_head *head;
int brport_idx = 0;
int br_idx = 0;
- int idx = 0;
+ int h, s_h;
+ int idx = 0, s_idx;
+ int err = 0;
+ int fidx = 0;
if (nlmsg_parse(cb->nlh, sizeof(struct ifinfomsg), tb, IFLA_MAX,
ifla_policy) == 0) {
@@ -3140,49 +3143,71 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
ops = br_dev->netdev_ops;
}
- cb->args[1] = 0;
- for_each_netdev(net, dev) {
- if (brport_idx && (dev->ifindex != brport_idx))
- continue;
+ s_h = cb->args[0];
+ s_idx = cb->args[1];
- if (!br_idx) { /* user did not specify a specific bridge */
- if (dev->priv_flags & IFF_BRIDGE_PORT) {
- br_dev = netdev_master_upper_dev_get(dev);
- cops = br_dev->netdev_ops;
- }
+ for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+ idx = 0;
+ head = &net->dev_index_head[h];
+ hlist_for_each_entry(dev, head, index_hlist) {
- } else {
- if (dev != br_dev &&
- !(dev->priv_flags & IFF_BRIDGE_PORT))
+ if (brport_idx && (dev->ifindex != brport_idx))
continue;
- if (br_dev != netdev_master_upper_dev_get(dev) &&
- !(dev->priv_flags & IFF_EBRIDGE))
- continue;
+ if (!br_idx) { /* user did not specify a specific bridge */
+ if (dev->priv_flags & IFF_BRIDGE_PORT) {
+ br_dev = netdev_master_upper_dev_get(dev);
+ cops = br_dev->netdev_ops;
+ }
+ } else {
+ if (dev != br_dev &&
+ !(dev->priv_flags & IFF_BRIDGE_PORT))
+ continue;
- cops = ops;
- }
+ if (br_dev != netdev_master_upper_dev_get(dev) &&
+ !(dev->priv_flags & IFF_EBRIDGE))
+ continue;
+ cops = ops;
+ }
- if (dev->priv_flags & IFF_BRIDGE_PORT) {
- if (cops && cops->ndo_fdb_dump)
- idx = cops->ndo_fdb_dump(skb, cb, br_dev, dev,
- idx);
- }
- if (cb->args[1] == -EMSGSIZE)
- break;
+ if (idx < s_idx)
+ goto cont;
- if (dev->netdev_ops->ndo_fdb_dump)
- idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
- idx);
- else
- idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
- if (cb->args[1] == -EMSGSIZE)
- break;
+ if (dev->priv_flags & IFF_BRIDGE_PORT) {
+ if (cops && cops->ndo_fdb_dump) {
+ err = cops->ndo_fdb_dump(skb, cb,
+ br_dev, dev,
+ &fidx);
+ if (err == -EMSGSIZE)
+ goto out;
+ }
+ }
- cops = NULL;
+ if (dev->netdev_ops->ndo_fdb_dump)
+ err = dev->netdev_ops->ndo_fdb_dump(skb, cb,
+ dev, NULL,
+ &fidx);
+ else
+ err = ndo_dflt_fdb_dump(skb, cb, dev, NULL,
+ &fidx);
+ if (err == -EMSGSIZE)
+ goto out;
+
+ cops = NULL;
+
+ /* reset fdb offset to 0 for rest of the interfaces */
+ cb->args[2] = 0;
+ fidx = 0;
+cont:
+ idx++;
+ }
}
- cb->args[0] = idx;
+out:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+ cb->args[2] = fidx;
+
return skb->len;
}
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 1031a0327fff..10b819308439 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -1042,7 +1042,7 @@ static int switchdev_port_fdb_dump_cb(struct switchdev_obj *obj)
struct nlmsghdr *nlh;
struct ndmsg *ndm;
- if (dump->idx < dump->cb->args[0])
+ if (dump->idx < dump->cb->args[2])
goto skip;
nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
@@ -1089,7 +1089,7 @@ nla_put_failure:
*/
int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
- struct net_device *filter_dev, int idx)
+ struct net_device *filter_dev, int *idx)
{
struct switchdev_fdb_dump dump = {
.fdb.obj.orig_dev = dev,
@@ -1097,14 +1097,14 @@ int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
.dev = dev,
.skb = skb,
.cb = cb,
- .idx = idx,
+ .idx = *idx,
};
int err;
err = switchdev_port_obj_dump(dev, &dump.fdb.obj,
switchdev_port_fdb_dump_cb);
- cb->args[1] = err;
- return dump.idx;
+ *idx = dump.idx;
+ return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);