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net: core: Another step of skb receive list processing 

netif_receive_skb_list_internal() now processes a list and hands it
 on to the next function.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Edward Cree 2018-07-02 16:13:24 +01:00 committed by David S. Miller
parent 920572b732
commit 7da517a3bc
1 changed files with 56 additions and 5 deletions
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61
net/core/dev.c
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@ -4843,6 +4843,14 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
return ret;
}
static void __netif_receive_skb_list(struct list_head *head)
{
struct sk_buff *skb, *next;
list_for_each_entry_safe(skb, next, head, list)
__netif_receive_skb(skb);
}
static int netif_receive_skb_internal(struct sk_buff *skb)
{
int ret;
@ -4883,6 +4891,50 @@ static int netif_receive_skb_internal(struct sk_buff *skb)
return ret;
}
static void netif_receive_skb_list_internal(struct list_head *head)
{
struct bpf_prog *xdp_prog = NULL;
struct sk_buff *skb, *next;
list_for_each_entry_safe(skb, next, head, list) {
net_timestamp_check(netdev_tstamp_prequeue, skb);
if (skb_defer_rx_timestamp(skb))
/* Handled, remove from list */
list_del(&skb->list);
}
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);
if (do_xdp_generic(xdp_prog, skb) != XDP_PASS)
/* Dropped, remove from list */
list_del(&skb->list);
}
rcu_read_unlock();
preempt_enable();
}
rcu_read_lock();
#ifdef CONFIG_RPS
if (static_key_false(&rps_needed)) {
list_for_each_entry_safe(skb, next, head, list) {
struct rps_dev_flow voidflow, *rflow = &voidflow;
int cpu = get_rps_cpu(skb->dev, skb, &rflow);
if (cpu >= 0) {
enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
/* Handled, remove from list */
list_del(&skb->list);
}
}
}
#endif
__netif_receive_skb_list(head);
rcu_read_unlock();
}
/**
* netif_receive_skb - process receive buffer from network
* @skb: buffer to process
@ -4910,20 +4962,19 @@ EXPORT_SYMBOL(netif_receive_skb);
* netif_receive_skb_list - process many receive buffers from network
* @head: list of skbs to process.
*
* For now, just calls netif_receive_skb() in a loop, ignoring the
* return value.
* Since return value of netif_receive_skb() is normally ignored, and
* wouldn't be meaningful for a list, this function returns void.
*
* This function may only be called from softirq context and interrupts
* should be enabled.
*/
void netif_receive_skb_list(struct list_head *head)
{
struct sk_buff *skb, *next;
struct sk_buff *skb;
list_for_each_entry(skb, head, list)
trace_netif_receive_skb_list_entry(skb);
list_for_each_entry_safe(skb, next, head, list)
netif_receive_skb_internal(skb);
netif_receive_skb_list_internal(head);
}
EXPORT_SYMBOL(netif_receive_skb_list);