[PATCH AUTOSEL 4.19 390/671] net: core: support XDP generic on stacked devices.

Sasha Levin
2020-01-16T18:53:32Z

From: Stephen Hemminger <stephen@networkplumber.org>

[ Upstream commit 458bf2f224f04a513b0be972f8708e78ee2c986e ]

When a device is stacked like (team, bonding, failsafe or netvsc) the
XDP generic program for the parent device was not called.

Move the call to XDP generic inside __netif_receive_skb_core where
it can be done multiple times for stacked case.

Fixes: d445516966dc ("net: xdp: support xdp generic on virtual devices")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/dev.c | 58 +++++++++++---------------------------------------
1 file changed, 12 insertions(+), 46 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index a26d87073f71..935fe158cfaf 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4465,23 +4465,6 @@ static int netif_rx_internal(struct sk_buff *skb)

trace_netif_rx(skb);

- if (static_branch_unlikely(&generic_xdp_needed_key)) {
- int ret;
-
- preempt_disable();
- rcu_read_lock();
- ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
- rcu_read_unlock();
- preempt_enable();
-
- /* Consider XDP consuming the packet a success from
- * the netdev point of view we do not want to count
- * this as an error.
- */
- if (ret != XDP_PASS)
- return NET_RX_SUCCESS;
- }
-
#ifdef CONFIG_RPS
if (static_key_false(&rps_needed)) {
struct rps_dev_flow voidflow, *rflow = &voidflow;
@@ -4815,6 +4798,18 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc,

__this_cpu_inc(softnet_data.processed);

+ if (static_branch_unlikely(&generic_xdp_needed_key)) {
+ int ret2;
+
+ preempt_disable();
+ ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
+ preempt_enable();
+
+ if (ret2 != XDP_PASS)
+ return NET_RX_DROP;
+ skb_reset_mac_len(skb);
+ }
+
if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
skb = skb_vlan_untag(skb);
@@ -5133,19 +5128,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
if (skb_defer_rx_timestamp(skb))
return NET_RX_SUCCESS;

- if (static_branch_unlikely(&generic_xdp_needed_key)) {
- int ret;
-
- preempt_disable();
- rcu_read_lock();
- ret = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
- rcu_read_unlock();
- preempt_enable();
-
- if (ret != XDP_PASS)
- return NET_RX_DROP;
- }
-
rcu_read_lock();
#ifdef CONFIG_RPS
if (static_key_false(&rps_needed)) {
@@ -5166,7 +5148,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb)

static void netif_receive_skb_list_internal(struct list_head *head)
{
- struct bpf_prog *xdp_prog = NULL;
struct sk_buff *skb, *next;
struct list_head sublist;

@@ -5179,21 +5160,6 @@ static void netif_receive_skb_list_internal(struct list_head *head)
}
list_splice_init(&sublist, head);

- if (static_branch_unlikely(&generic_xdp_needed_key)) {
- preempt_disable();
- rcu_read_lock();
- list_for_each_entry_safe(skb, next, head, list) {
- xdp_prog = rcu_dereference(skb->dev->xdp_prog);
- skb_list_del_init(skb);
- if (do_xdp_generic(xdp_prog, skb) == XDP_PASS)
- list_add_tail(&skb->list, &sublist);
- }
- rcu_read_unlock();
- preempt_enable();
- /* Put passed packets back on main list */
- list_splice_init(&sublist, head);
- }
-
rcu_read_lock();
#ifdef CONFIG_RPS
if (static_key_false(&rps_needed)) {
--
2.20.1