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net: core: another layer of lists, around PF_MEMALLOC skb handling

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First example of a layer splitting the list (rather than merely taking
 individual packets off it).
Involves new list.h function, list_cut_before(), like list_cut_position()
 but cuts on the other side of the given entry.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree
2018-07-02 16:13:40 +01:00
committed by David S. Miller
parent 7da517a3bc
commit 4ce0017a37
2 changed files with 66 additions and 8 deletions
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44
net/core/dev.c
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@ -4784,6 +4784,14 @@ int netif_receive_skb_core(struct sk_buff *skb)
}
EXPORT_SYMBOL(netif_receive_skb_core);
static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc)
{
struct sk_buff *skb, *next;
list_for_each_entry_safe(skb, next, head, list)
__netif_receive_skb_core(skb, pfmemalloc);
}
static int __netif_receive_skb(struct sk_buff *skb)
{
int ret;
@ -4809,6 +4817,34 @@ static int __netif_receive_skb(struct sk_buff *skb)
return ret;
}
static void __netif_receive_skb_list(struct list_head *head)
{
unsigned long noreclaim_flag = 0;
struct sk_buff *skb, *next;
bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */
list_for_each_entry_safe(skb, next, head, list) {
if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) {
struct list_head sublist;
/* Handle the previous sublist */
list_cut_before(&sublist, head, &skb->list);
__netif_receive_skb_list_core(&sublist, pfmemalloc);
pfmemalloc = !pfmemalloc;
/* See comments in __netif_receive_skb */
if (pfmemalloc)
noreclaim_flag = memalloc_noreclaim_save();
else
memalloc_noreclaim_restore(noreclaim_flag);
}
}
/* Handle the remaining sublist */
__netif_receive_skb_list_core(head, pfmemalloc);
/* Restore pflags */
if (pfmemalloc)
memalloc_noreclaim_restore(noreclaim_flag);
}
static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
{
struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
@ -4843,14 +4879,6 @@ 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;