Use percpu data to move the large temporary buffer off the push_nsh
stack. This reduces stack consumption from 336 bytes to 64 bytes.
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
net/openvswitch/actions.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index be15ef693284..fa53e22f3ebe 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -349,12 +349,18 @@ static int push_eth(struct sk_buff *skb, struct
sw_flow_key *key,
return 0;
}
+struct tmp_nsh_hdr {
+ u8 data[NSH_HDR_MAX_LEN];
+};
+
+static DEFINE_PER_CPU(struct tmp_nsh_hdr, tmp_nsh_hdr);
+
static noinline_for_stack int push_nsh(struct sk_buff *skb,
struct sw_flow_key *key,
const struct nlattr *a)
{
- u8 buffer[NSH_HDR_MAX_LEN];
- struct nshhdr *nh = (struct nshhdr *)buffer;
+ struct tmp_nsh_hdr *hdr = this_cpu_ptr(&tmp_nsh_hdr);
+ struct nshhdr *nh = (struct nshhdr *)&hdr->data[0];
int err;
err = nsh_hdr_from_nlattr(a, nh, NSH_HDR_MAX_LEN);
--
2.42.0
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