[PATCH v9 bpf-next 3/9] bpf: udp: Encapsulate logic to get udp table

[Aditi Ghag <aditi.ghag@xxxxxxxxxxxxx>]

This is a preparatory commit that encapsulates the logic
to get udp table in iterator inside udp_get_table_afinfo, and
renames the function to `udp_get_table_seq` accordingly.

Suggested-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Signed-off-by: Aditi Ghag <aditi.ghag@xxxxxxxxxxxxx>
---
 net/ipv4/udp.c | 35 ++++++++++++-----------------------
 1 file changed, 12 insertions(+), 23 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 71e3fef44fd5..c426ebafeb13 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2993,9 +2993,16 @@ static bool seq_sk_match(struct seq_file *seq, const struct sock *sk)
 		net_eq(sock_net(sk), seq_file_net(seq)));
 }
 
-static struct udp_table *udp_get_table_afinfo(struct udp_seq_afinfo *afinfo,
-					      struct net *net)
+static struct udp_table *udp_get_table_seq(struct seq_file *seq,
+					   struct net *net)
 {
+	const struct udp_iter_state *state = seq->private;
+	const struct udp_seq_afinfo *afinfo;
+
+	if (state->bpf_seq_afinfo)
+		return net->ipv4.udp_table;
+
+	afinfo = pde_data(file_inode(seq->file));
 	return afinfo->udp_table ? : net->ipv4.udp_table;
 }
 
@@ -3003,16 +3010,10 @@ static struct sock *udp_get_first(struct seq_file *seq, int start)
 {
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
-	struct udp_seq_afinfo *afinfo;
 	struct udp_table *udptable;
 	struct sock *sk;
 
-	if (state->bpf_seq_afinfo)
-		afinfo = state->bpf_seq_afinfo;
-	else
-		afinfo = pde_data(file_inode(seq->file));
-
-	udptable = udp_get_table_afinfo(afinfo, net);
+	udptable = udp_get_table_seq(seq, net);
 
 	for (state->bucket = start; state->bucket <= udptable->mask;
 	     ++state->bucket) {
@@ -3037,20 +3038,14 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
 {
 	struct udp_iter_state *state = seq->private;
 	struct net *net = seq_file_net(seq);
-	struct udp_seq_afinfo *afinfo;
 	struct udp_table *udptable;
 
-	if (state->bpf_seq_afinfo)
-		afinfo = state->bpf_seq_afinfo;
-	else
-		afinfo = pde_data(file_inode(seq->file));
-
 	do {
 		sk = sk_next(sk);
 	} while (sk && !seq_sk_match(seq, sk));
 
 	if (!sk) {
-		udptable = udp_get_table_afinfo(afinfo, net);
+		udptable = udp_get_table_seq(seq, net);
 
 		if (state->bucket <= udptable->mask)
 			spin_unlock_bh(&udptable->hash[state->bucket].lock);
@@ -3096,15 +3091,9 @@ EXPORT_SYMBOL(udp_seq_next);
 void udp_seq_stop(struct seq_file *seq, void *v)
 {
 	struct udp_iter_state *state = seq->private;
-	struct udp_seq_afinfo *afinfo;
 	struct udp_table *udptable;
 
-	if (state->bpf_seq_afinfo)
-		afinfo = state->bpf_seq_afinfo;
-	else
-		afinfo = pde_data(file_inode(seq->file));
-
-	udptable = udp_get_table_afinfo(afinfo, seq_file_net(seq));
+	udptable = udp_get_table_seq(seq, seq_file_net(seq));
 
 	if (state->bucket <= udptable->mask)
 		spin_unlock_bh(&udptable->hash[state->bucket].lock);
-- 
2.34.1