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gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 

All gro_complete() handlers are called from napi_gro_complete()
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 14:56:08 -08:00 committed by Jakub Kicinski
parent fc1ca3348a
commit 627b94f75b
8 changed files with 8 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/geneve.c
View File

@ -545,13 +545,10 @@ static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
gh_len = geneve_hlen(gh);
type = gh->proto_type;
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
rcu_read_unlock();
skb_set_inner_mac_header(skb, nhoff + gh_len);
return err;

2
net/8021q/vlan_core.c
View File

@ -513,14 +513,12 @@ static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
struct packet_offload *ptype;
int err = -ENOENT;
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, nhoff + sizeof(*vhdr));
rcu_read_unlock();
return err;
}

2
net/ethernet/eth.c
View File

@ -466,14 +466,12 @@ int eth_gro_complete(struct sk_buff *skb, int nhoff)
if (skb->encapsulation)
skb_set_inner_mac_header(skb, nhoff);
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype != NULL)
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
ipv6_gro_complete, inet_gro_complete,
skb, nhoff + sizeof(*eh));
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(eth_gro_complete);

7
net/ipv4/af_inet.c
View File

@ -1612,10 +1612,9 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
csum_replace2(&iph->check, iph->tot_len, newlen);
iph->tot_len = newlen;
rcu_read_lock();
ops = rcu_dereference(inet_offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out_unlock;
goto out;
/* Only need to add sizeof(*iph) to get to the next hdr below
* because any hdr with option will have been flushed in
@ -1625,9 +1624,7 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff)
tcp4_gro_complete, udp4_gro_complete,
skb, nhoff + sizeof(*iph));
out_unlock:
rcu_read_unlock();
out:
return err;
}

13
net/ipv4/fou.c
View File

@ -266,19 +266,16 @@ static int fou_gro_complete(struct sock *sk, struct sk_buff *skb,
const struct net_offload *ops;
int err = -ENOSYS;
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out_unlock;
goto out;
err = ops->callbacks.gro_complete(skb, nhoff);
skb_set_inner_mac_header(skb, nhoff);
out_unlock:
rcu_read_unlock();
out:
return err;
}
@ -480,18 +477,16 @@ static int gue_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
return err;
}
rcu_read_lock();
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out_unlock;
goto out;
err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
skb_set_inner_mac_header(skb, nhoff + guehlen);
out_unlock:
rcu_read_unlock();
out:
return err;
}

3
net/ipv4/gre_offload.c
View File

@ -253,13 +253,10 @@ static int gre_gro_complete(struct sk_buff *skb, int nhoff)
if (greh->flags & GRE_CSUM)
grehlen += GRE_HEADER_SECTION;
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + grehlen);
rcu_read_unlock();
skb_set_inner_mac_header(skb, nhoff + grehlen);
return err;

2
net/ipv4/udp_offload.c
View File

@ -667,7 +667,6 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
uh->len = newlen;
rcu_read_lock();
sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
udp4_lib_lookup_skb, skb, uh->source, uh->dest);
if (sk && udp_sk(sk)->gro_complete) {
@ -688,7 +687,6 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff,
} else {
err = udp_gro_complete_segment(skb);
}
rcu_read_unlock();
if (skb->remcsum_offload)
skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM;

8
net/ipv6/ip6_offload.c
View File

@ -327,18 +327,14 @@ INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
rcu_read_lock();
nhoff += sizeof(*iph) + ipv6_exthdrs_len(iph, &ops);
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
goto out_unlock;
goto out;
err = INDIRECT_CALL_L4(ops->callbacks.gro_complete, tcp6_gro_complete,
udp6_gro_complete, skb, nhoff);
out_unlock:
rcu_read_unlock();
out:
return err;
}