Commit 4b280531 authored by David S. Miller's avatar David S. Miller

Merge branch 'XDP-generic-fixes'

Stephen Hemminger says:

====================
XDP generic fixes

This set of patches came about while investigating XDP
generic on Azure. The split brain nature of the accelerated
networking exposed issues with the stack device model.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents f2696099 458bf2f2
...@@ -2000,6 +2000,12 @@ static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb) ...@@ -2000,6 +2000,12 @@ static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
struct netvsc_vf_pcpu_stats *pcpu_stats struct netvsc_vf_pcpu_stats *pcpu_stats
= this_cpu_ptr(ndev_ctx->vf_stats); = this_cpu_ptr(ndev_ctx->vf_stats);
skb = skb_share_check(skb, GFP_ATOMIC);
if (unlikely(!skb))
return RX_HANDLER_CONSUMED;
*pskb = skb;
skb->dev = ndev; skb->dev = ndev;
u64_stats_update_begin(&pcpu_stats->syncp); u64_stats_update_begin(&pcpu_stats->syncp);
......
...@@ -4502,23 +4502,6 @@ static int netif_rx_internal(struct sk_buff *skb) ...@@ -4502,23 +4502,6 @@ static int netif_rx_internal(struct sk_buff *skb)
trace_netif_rx(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 #ifdef CONFIG_RPS
if (static_branch_unlikely(&rps_needed)) { if (static_branch_unlikely(&rps_needed)) {
struct rps_dev_flow voidflow, *rflow = &voidflow; struct rps_dev_flow voidflow, *rflow = &voidflow;
...@@ -4858,6 +4841,18 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc, ...@@ -4858,6 +4841,18 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc,
__this_cpu_inc(softnet_data.processed); __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) || if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
skb->protocol == cpu_to_be16(ETH_P_8021AD)) { skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
skb = skb_vlan_untag(skb); skb = skb_vlan_untag(skb);
...@@ -5178,19 +5173,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb) ...@@ -5178,19 +5173,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
if (skb_defer_rx_timestamp(skb)) if (skb_defer_rx_timestamp(skb))
return NET_RX_SUCCESS; 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(); rcu_read_lock();
#ifdef CONFIG_RPS #ifdef CONFIG_RPS
if (static_branch_unlikely(&rps_needed)) { if (static_branch_unlikely(&rps_needed)) {
...@@ -5211,7 +5193,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb) ...@@ -5211,7 +5193,6 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
static void netif_receive_skb_list_internal(struct list_head *head) static void netif_receive_skb_list_internal(struct list_head *head)
{ {
struct bpf_prog *xdp_prog = NULL;
struct sk_buff *skb, *next; struct sk_buff *skb, *next;
struct list_head sublist; struct list_head sublist;
...@@ -5224,21 +5205,6 @@ static void netif_receive_skb_list_internal(struct list_head *head) ...@@ -5224,21 +5205,6 @@ static void netif_receive_skb_list_internal(struct list_head *head)
} }
list_splice_init(&sublist, 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(); rcu_read_lock();
#ifdef CONFIG_RPS #ifdef CONFIG_RPS
if (static_branch_unlikely(&rps_needed)) { if (static_branch_unlikely(&rps_needed)) {
......
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