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gro: remove rcu_read_lock/rcu_read_unlock from gro_receive handlers 

All gro_receive() handlers are called from dev_gro_receive()
while rcu_read_lock() has been called.

There is no point stacking more rcu_read_lock()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-11-23 14:56:07 -08:00 committed by Jakub Kicinski
parent 1aad9634b9
commit fc1ca3348a
9 changed files with 14 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/geneve.c
View File

@ -517,18 +517,15 @@ static struct sk_buff *geneve_gro_receive(struct sock *sk,
type = gh->proto_type;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
goto out_unlock;
goto out;
skb_gro_pull(skb, gh_len);
skb_gro_postpull_rcsum(skb, gh, gh_len);
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
flush = 0;
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

5
net/8021q/vlan_core.c
View File

@ -476,10 +476,9 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
type = vhdr->h_vlan_encapsulated_proto;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
goto out_unlock;
goto out;
flush = 0;
@ -501,8 +500,6 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head,
ipv6_gro_receive, inet_gro_receive,
head, skb);
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

5
net/ethernet/eth.c
View File

@ -436,11 +436,10 @@ struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
type = eh->h_proto;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (ptype == NULL) {
flush = 1;
goto out_unlock;
goto out;
}
skb_gro_pull(skb, sizeof(*eh));
@ -450,8 +449,6 @@ struct sk_buff *eth_gro_receive(struct list_head *head, struct sk_buff *skb)
ipv6_gro_receive, inet_gro_receive,
head, skb);
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

12
net/ipv4/af_inet.c
View File

@ -1452,19 +1452,18 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
proto = iph->protocol;
rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
goto out_unlock;
goto out;
if (*(u8 *)iph != 0x45)
goto out_unlock;
goto out;
if (ip_is_fragment(iph))
goto out_unlock;
goto out;
if (unlikely(ip_fast_csum((u8 *)iph, 5)))
goto out_unlock;
goto out;
id = ntohl(*(__be32 *)&iph->id);
flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
@ -1541,9 +1540,6 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
ops->callbacks.gro_receive, head, skb);
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

12
net/ipv4/fou.c
View File

@ -247,17 +247,14 @@ static struct sk_buff *fou_gro_receive(struct sock *sk,
/* Flag this frame as already having an outer encap header */
NAPI_GRO_CB(skb)->is_fou = 1;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
goto out_unlock;
goto out;
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
out_unlock:
rcu_read_unlock();
out:
return pp;
}
@ -439,17 +436,14 @@ next_proto:
/* Flag this frame as already having an outer encap header */
NAPI_GRO_CB(skb)->is_fou = 1;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
goto out_unlock;
goto out;
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);
flush = 0;
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final_remcsum(skb, pp, flush, &grc);

9
net/ipv4/gre_offload.c
View File

@ -163,10 +163,9 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
type = greh->protocol;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype)
goto out_unlock;
goto out;
grehlen = GRE_HEADER_SECTION;
@ -180,13 +179,13 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
if (skb_gro_header_hard(skb, hlen)) {
greh = skb_gro_header_slow(skb, hlen, off);
if (unlikely(!greh))
goto out_unlock;
goto out;
}
/* Don't bother verifying checksum if we're going to flush anyway. */
if ((greh->flags & GRE_CSUM) && !NAPI_GRO_CB(skb)->flush) {
if (skb_gro_checksum_simple_validate(skb))
goto out_unlock;
goto out;
skb_gro_checksum_try_convert(skb, IPPROTO_GRE,
null_compute_pseudo);
@ -230,8 +229,6 @@ static struct sk_buff *gre_gro_receive(struct list_head *head,
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
flush = 0;
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

2
net/ipv4/udp_offload.c
View File

@ -628,13 +628,11 @@ struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb)
inet_gro_compute_pseudo);
skip:
NAPI_GRO_CB(skb)->is_ipv6 = 0;
rcu_read_lock();
if (static_branch_unlikely(&udp_encap_needed_key))
sk = udp4_gro_lookup_skb(skb, uh->source, uh->dest);
pp = udp_gro_receive(head, skb, uh, sk);
rcu_read_unlock();
return pp;
flush:

6
net/ipv6/ip6_offload.c
View File

@ -208,7 +208,6 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
flush += ntohs(iph->payload_len) != skb_gro_len(skb);
rcu_read_lock();
proto = iph->nexthdr;
ops = rcu_dereference(inet6_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive) {
@ -221,7 +220,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
ops = rcu_dereference(inet6_offloads[proto]);
if (!ops || !ops->callbacks.gro_receive)
goto out_unlock;
goto out;
iph = ipv6_hdr(skb);
}
@ -279,9 +278,6 @@ not_same_flow:
pp = indirect_call_gro_receive_l4(tcp6_gro_receive, udp6_gro_receive,
ops->callbacks.gro_receive, head, skb);
out_unlock:
rcu_read_unlock();
out:
skb_gro_flush_final(skb, pp, flush);

2
net/ipv6/udp_offload.c
View File

@ -145,13 +145,11 @@ struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb)
skip:
NAPI_GRO_CB(skb)->is_ipv6 = 1;
rcu_read_lock();
if (static_branch_unlikely(&udpv6_encap_needed_key))
sk = udp6_gro_lookup_skb(skb, uh->source, uh->dest);
pp = udp_gro_receive(head, skb, uh, sk);
rcu_read_unlock();
return pp;
flush: