diff mbox series

[v2,net-next,1/3] gro: simplify gro_list_prepare()

Message ID 20210313202946.59729-2-alobakin@pm.me (mailing list archive)
State Accepted
Delegated to: Netdev Maintainers
Headers show
Series gro: micro-optimize dev_gro_receive() | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 10 this patch: 10
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 44 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 10 this patch: 10
netdev/header_inline success Link

Commit Message

Alexander Lobakin March 13, 2021, 8:30 p.m. UTC 
gro_list_prepare() always returns &napi->gro_hash[bucket].list,
without any variations. Moreover, it uses 'napi' argument only to
have access to this list, and calculates the bucket index for the
second time (firstly it happens at the beginning of
dev_gro_receive()) to do that.
Given that dev_gro_receive() already has an index to the needed
list, just pass it as the first argument to eliminate redundant
calculations, and make gro_list_prepare() return void.
Also, both arguments of gro_list_prepare() can be constified since
this function can only modify the skbs from the bucket list.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 net/core/dev.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--
2.30.2
diff mbox series

Patch

diff --git a/net/core/dev.c b/net/core/dev.c
index 2bfdd528c7c3..1317e6b6758a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5858,15 +5858,13 @@  void napi_gro_flush(struct napi_struct *napi, bool flush_old)
 }
 EXPORT_SYMBOL(napi_gro_flush);

-static struct list_head *gro_list_prepare(struct napi_struct *napi,
-					  struct sk_buff *skb)
+static void gro_list_prepare(const struct list_head *head,
+			     const struct sk_buff *skb)
 {
 	unsigned int maclen = skb->dev->hard_header_len;
 	u32 hash = skb_get_hash_raw(skb);
-	struct list_head *head;
 	struct sk_buff *p;

-	head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list;
 	list_for_each_entry(p, head, list) {
 		unsigned long diffs;

@@ -5892,8 +5890,6 @@  static struct list_head *gro_list_prepare(struct napi_struct *napi,
 				       maclen);
 		NAPI_GRO_CB(p)->same_flow = !diffs;
 	}
-
-	return head;
 }

 static void skb_gro_reset_offset(struct sk_buff *skb)
@@ -5957,10 +5953,10 @@  static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head)
 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
 	u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1);
+	struct list_head *gro_head = &napi->gro_hash[hash].list;
 	struct list_head *head = &offload_base;
 	struct packet_offload *ptype;
 	__be16 type = skb->protocol;
-	struct list_head *gro_head;
 	struct sk_buff *pp = NULL;
 	enum gro_result ret;
 	int same_flow;
@@ -5969,7 +5965,7 @@  static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
 	if (netif_elide_gro(skb->dev))
 		goto normal;

-	gro_head = gro_list_prepare(napi, skb);
+	gro_list_prepare(gro_head, skb);

 	rcu_read_lock();
 	list_for_each_entry_rcu(ptype, head, list) {