[PATCH v2 net-next 0/2] ipv6: Random cleanup for in6addr_any.

[PATCH v2 net-next 0/2] ipv6: Random cleanup for in6addr_any.

[Kuniyuki Iwashima]

The first patch removes in6addr_any alternatives and the second
removes redundant initialisation of a local variable.


Changes:
  v2: Use ipv6_addr_any() in patch 1. (David Ahern)

  v1: https://lore.kernel.org/netdev/20230322012204.33157-1-kuniyu@amazon.com/


Kuniyuki Iwashima (2):
  ipv6: Remove in6addr_any alternatives.
  6lowpan: Remove redundant initialisation.

 .../net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c |  5 ++---
 include/net/ip6_fib.h                                 |  9 +++------
 include/trace/events/fib.h                            |  5 ++---
 include/trace/events/fib6.h                           |  5 +----
 net/6lowpan/iphc.c                                    |  2 +-
 net/ethtool/ioctl.c                                   | 10 +++++-----
 net/ipv4/inet_hashtables.c                            | 11 ++++-------
 7 files changed, 18 insertions(+), 29 deletions(-)

-- 
2.30.2

[PATCH v2 net-next 1/2] ipv6: Remove in6addr_any alternatives.

[Kuniyuki Iwashima]

Some code defines the IPv6 wildcard address as a local variable and
use it with memcmp() or ipv6_addr_equal().

Let's use in6addr_any and ipv6_addr_any() instead.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 .../net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c |  5 ++---
 include/net/ip6_fib.h                                 |  9 +++------
 include/trace/events/fib.h                            |  5 ++---
 include/trace/events/fib6.h                           |  5 +----
 net/ethtool/ioctl.c                                   | 10 +++++-----
 net/ipv4/inet_hashtables.c                            | 11 ++++-------
 6 files changed, 17 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
index a108e73c9f66..20c2d2ecaf93 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
@@ -98,7 +98,6 @@ int mlx5e_tc_set_attr_rx_tun(struct mlx5e_tc_flow *flow,
 #if IS_ENABLED(CONFIG_INET) && IS_ENABLED(CONFIG_IPV6)
 	else if (ip_version == 6) {
 		int ipv6_size = MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6);
-		struct in6_addr zerov6 = {};
 
 		daddr = MLX5_ADDR_OF(fte_match_param, spec->match_value,
 				     outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6);
@@ -106,8 +105,8 @@ int mlx5e_tc_set_attr_rx_tun(struct mlx5e_tc_flow *flow,
 				     outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6);
 		memcpy(&tun_attr->dst_ip.v6, daddr, ipv6_size);
 		memcpy(&tun_attr->src_ip.v6, saddr, ipv6_size);
-		if (!memcmp(&tun_attr->dst_ip.v6, &zerov6, sizeof(zerov6)) ||
-		    !memcmp(&tun_attr->src_ip.v6, &zerov6, sizeof(zerov6)))
+		if (ipv6_addr_any(&tun_attr->dst_ip.v6) ||
+		    ipv6_addr_any(&tun_attr->src_ip.v6))
 			return 0;
 	}
 #endif
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 6268963d9599..6f21d37a07c3 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -472,13 +472,10 @@ void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
 	rcu_read_lock();
 
 	from = rcu_dereference(rt->from);
-	if (from) {
+	if (from)
 		*addr = from->fib6_prefsrc.addr;
-	} else {
-		struct in6_addr in6_zero = {};
-
-		*addr = in6_zero;
-	}
+	else
+		*addr = in6addr_any;
 
 	rcu_read_unlock();
 }
diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
index c2300c407f58..76297ecd4935 100644
--- a/include/trace/events/fib.h
+++ b/include/trace/events/fib.h
@@ -36,7 +36,6 @@ TRACE_EVENT(fib_table_lookup,
 	),
 
 	TP_fast_assign(
-		struct in6_addr in6_zero = {};
 		struct net_device *dev;
 		struct in6_addr *in6;
 		__be32 *p32;
@@ -74,7 +73,7 @@ TRACE_EVENT(fib_table_lookup,
 				*p32 = nhc->nhc_gw.ipv4;
 
 				in6 = (struct in6_addr *)__entry->gw6;
-				*in6 = in6_zero;
+				*in6 = in6addr_any;
 			} else if (nhc->nhc_gw_family == AF_INET6) {
 				p32 = (__be32 *) __entry->gw4;
 				*p32 = 0;
@@ -87,7 +86,7 @@ TRACE_EVENT(fib_table_lookup,
 			*p32 = 0;
 
 			in6 = (struct in6_addr *)__entry->gw6;
-			*in6 = in6_zero;
+			*in6 = in6addr_any;
 		}
 	),
 
diff --git a/include/trace/events/fib6.h b/include/trace/events/fib6.h
index 6e821eb79450..4d3e607b3cde 100644
--- a/include/trace/events/fib6.h
+++ b/include/trace/events/fib6.h
@@ -68,11 +68,8 @@ TRACE_EVENT(fib6_table_lookup,
 			strcpy(__entry->name, "-");
 		}
 		if (res->f6i == net->ipv6.fib6_null_entry) {
-			struct in6_addr in6_zero = {};
-
 			in6 = (struct in6_addr *)__entry->gw;
-			*in6 = in6_zero;
-
+			*in6 = in6addr_any;
 		} else if (res->nh) {
 			in6 = (struct in6_addr *)__entry->gw;
 			*in6 = res->nh->fib_nh_gw6;
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 646b3e490c71..59adc4e6e9ee 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -27,6 +27,7 @@
 #include <linux/net.h>
 #include <linux/pm_runtime.h>
 #include <net/devlink.h>
+#include <net/ipv6.h>
 #include <net/xdp_sock_drv.h>
 #include <net/flow_offload.h>
 #include <linux/ethtool_netlink.h>
@@ -3127,7 +3128,6 @@ struct ethtool_rx_flow_rule *
 ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
 {
 	const struct ethtool_rx_flow_spec *fs = input->fs;
-	static struct in6_addr zero_addr = {};
 	struct ethtool_rx_flow_match *match;
 	struct ethtool_rx_flow_rule *flow;
 	struct flow_action_entry *act;
@@ -3233,20 +3233,20 @@ ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
 
 		v6_spec = &fs->h_u.tcp_ip6_spec;
 		v6_m_spec = &fs->m_u.tcp_ip6_spec;
-		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr))) {
+		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6src)) {
 			memcpy(&match->key.ipv6.src, v6_spec->ip6src,
 			       sizeof(match->key.ipv6.src));
 			memcpy(&match->mask.ipv6.src, v6_m_spec->ip6src,
 			       sizeof(match->mask.ipv6.src));
 		}
-		if (memcmp(v6_m_spec->ip6dst, &zero_addr, sizeof(zero_addr))) {
+		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6dst)) {
 			memcpy(&match->key.ipv6.dst, v6_spec->ip6dst,
 			       sizeof(match->key.ipv6.dst));
 			memcpy(&match->mask.ipv6.dst, v6_m_spec->ip6dst,
 			       sizeof(match->mask.ipv6.dst));
 		}
-		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr)) ||
-		    memcmp(v6_m_spec->ip6dst, &zero_addr, sizeof(zero_addr))) {
+		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6src) ||
+		    !ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6dst)) {
 			match->dissector.used_keys |=
 				BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS);
 			match->dissector.offset[FLOW_DISSECTOR_KEY_IPV6_ADDRS] =
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 6edae3886885..e7391bf310a7 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -826,13 +826,11 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
 				      unsigned short port, int l3mdev, const struct sock *sk)
 {
 #if IS_ENABLED(CONFIG_IPV6)
-	struct in6_addr addr_any = {};
-
 	if (sk->sk_family != tb->family) {
 		if (sk->sk_family == AF_INET)
 			return net_eq(ib2_net(tb), net) && tb->port == port &&
 				tb->l3mdev == l3mdev &&
-				ipv6_addr_equal(&tb->v6_rcv_saddr, &addr_any);
+				ipv6_addr_any(&tb->v6_rcv_saddr);
 
 		return false;
 	}
@@ -840,7 +838,7 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
 	if (sk->sk_family == AF_INET6)
 		return net_eq(ib2_net(tb), net) && tb->port == port &&
 			tb->l3mdev == l3mdev &&
-			ipv6_addr_equal(&tb->v6_rcv_saddr, &addr_any);
+			ipv6_addr_any(&tb->v6_rcv_saddr);
 	else
 #endif
 		return net_eq(ib2_net(tb), net) && tb->port == port &&
@@ -866,11 +864,10 @@ inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, in
 {
 	struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
 	u32 hash;
-#if IS_ENABLED(CONFIG_IPV6)
-	struct in6_addr addr_any = {};
 
+#if IS_ENABLED(CONFIG_IPV6)
 	if (sk->sk_family == AF_INET6)
-		hash = ipv6_portaddr_hash(net, &addr_any, port);
+		hash = ipv6_portaddr_hash(net, &in6addr_any, port);
 	else
 #endif
 		hash = ipv4_portaddr_hash(net, 0, port);
-- 
2.30.2

Re: [PATCH v2 net-next 1/2] ipv6: Remove in6addr_any alternatives.

[Mark Bloch]

On 28/03/2023 2:54, Kuniyuki Iwashima wrote:
> Some code defines the IPv6 wildcard address as a local variable and
> use it with memcmp() or ipv6_addr_equal().
> 
> Let's use in6addr_any and ipv6_addr_any() instead.
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
> ---
>  .../net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c |  5 ++---
>  include/net/ip6_fib.h                                 |  9 +++------
>  include/trace/events/fib.h                            |  5 ++---
>  include/trace/events/fib6.h                           |  5 +----
>  net/ethtool/ioctl.c                                   | 10 +++++-----
>  net/ipv4/inet_hashtables.c                            | 11 ++++-------
>  6 files changed, 17 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> index a108e73c9f66..20c2d2ecaf93 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c
> @@ -98,7 +98,6 @@ int mlx5e_tc_set_attr_rx_tun(struct mlx5e_tc_flow *flow,
>  #if IS_ENABLED(CONFIG_INET) && IS_ENABLED(CONFIG_IPV6)
>  	else if (ip_version == 6) {
>  		int ipv6_size = MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6);
> -		struct in6_addr zerov6 = {};
>  
>  		daddr = MLX5_ADDR_OF(fte_match_param, spec->match_value,
>  				     outer_headers.dst_ipv4_dst_ipv6.ipv6_layout.ipv6);
> @@ -106,8 +105,8 @@ int mlx5e_tc_set_attr_rx_tun(struct mlx5e_tc_flow *flow,
>  				     outer_headers.src_ipv4_src_ipv6.ipv6_layout.ipv6);
>  		memcpy(&tun_attr->dst_ip.v6, daddr, ipv6_size);
>  		memcpy(&tun_attr->src_ip.v6, saddr, ipv6_size);
> -		if (!memcmp(&tun_attr->dst_ip.v6, &zerov6, sizeof(zerov6)) ||
> -		    !memcmp(&tun_attr->src_ip.v6, &zerov6, sizeof(zerov6)))
> +		if (ipv6_addr_any(&tun_attr->dst_ip.v6) ||
> +		    ipv6_addr_any(&tun_attr->src_ip.v6))
>  			return 0;
>  	}
>  #endif
> diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
> index 6268963d9599..6f21d37a07c3 100644
> --- a/include/net/ip6_fib.h
> +++ b/include/net/ip6_fib.h
> @@ -472,13 +472,10 @@ void rt6_get_prefsrc(const struct rt6_info *rt, struct in6_addr *addr)
>  	rcu_read_lock();
>  
>  	from = rcu_dereference(rt->from);
> -	if (from) {
> +	if (from)
>  		*addr = from->fib6_prefsrc.addr;
> -	} else {
> -		struct in6_addr in6_zero = {};
> -
> -		*addr = in6_zero;
> -	}
> +	else
> +		*addr = in6addr_any;
>  
>  	rcu_read_unlock();
>  }
> diff --git a/include/trace/events/fib.h b/include/trace/events/fib.h
> index c2300c407f58..76297ecd4935 100644
> --- a/include/trace/events/fib.h
> +++ b/include/trace/events/fib.h
> @@ -36,7 +36,6 @@ TRACE_EVENT(fib_table_lookup,
>  	),
>  
>  	TP_fast_assign(
> -		struct in6_addr in6_zero = {};
>  		struct net_device *dev;
>  		struct in6_addr *in6;
>  		__be32 *p32;
> @@ -74,7 +73,7 @@ TRACE_EVENT(fib_table_lookup,
>  				*p32 = nhc->nhc_gw.ipv4;
>  
>  				in6 = (struct in6_addr *)__entry->gw6;
> -				*in6 = in6_zero;
> +				*in6 = in6addr_any;
>  			} else if (nhc->nhc_gw_family == AF_INET6) {
>  				p32 = (__be32 *) __entry->gw4;
>  				*p32 = 0;
> @@ -87,7 +86,7 @@ TRACE_EVENT(fib_table_lookup,
>  			*p32 = 0;
>  
>  			in6 = (struct in6_addr *)__entry->gw6;
> -			*in6 = in6_zero;
> +			*in6 = in6addr_any;
>  		}
>  	),
>  
> diff --git a/include/trace/events/fib6.h b/include/trace/events/fib6.h
> index 6e821eb79450..4d3e607b3cde 100644
> --- a/include/trace/events/fib6.h
> +++ b/include/trace/events/fib6.h
> @@ -68,11 +68,8 @@ TRACE_EVENT(fib6_table_lookup,
>  			strcpy(__entry->name, "-");
>  		}
>  		if (res->f6i == net->ipv6.fib6_null_entry) {
> -			struct in6_addr in6_zero = {};
> -
>  			in6 = (struct in6_addr *)__entry->gw;
> -			*in6 = in6_zero;
> -
> +			*in6 = in6addr_any;
>  		} else if (res->nh) {
>  			in6 = (struct in6_addr *)__entry->gw;
>  			*in6 = res->nh->fib_nh_gw6;
> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
> index 646b3e490c71..59adc4e6e9ee 100644
> --- a/net/ethtool/ioctl.c
> +++ b/net/ethtool/ioctl.c
> @@ -27,6 +27,7 @@
>  #include <linux/net.h>
>  #include <linux/pm_runtime.h>
>  #include <net/devlink.h>
> +#include <net/ipv6.h>
>  #include <net/xdp_sock_drv.h>
>  #include <net/flow_offload.h>
>  #include <linux/ethtool_netlink.h>
> @@ -3127,7 +3128,6 @@ struct ethtool_rx_flow_rule *
>  ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
>  {
>  	const struct ethtool_rx_flow_spec *fs = input->fs;
> -	static struct in6_addr zero_addr = {};
>  	struct ethtool_rx_flow_match *match;
>  	struct ethtool_rx_flow_rule *flow;
>  	struct flow_action_entry *act;
> @@ -3233,20 +3233,20 @@ ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
>  
>  		v6_spec = &fs->h_u.tcp_ip6_spec;
>  		v6_m_spec = &fs->m_u.tcp_ip6_spec;
> -		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr))) {
> +		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6src)) {
>  			memcpy(&match->key.ipv6.src, v6_spec->ip6src,
>  			       sizeof(match->key.ipv6.src));
>  			memcpy(&match->mask.ipv6.src, v6_m_spec->ip6src,
>  			       sizeof(match->mask.ipv6.src));
>  		}
> -		if (memcmp(v6_m_spec->ip6dst, &zero_addr, sizeof(zero_addr))) {
> +		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6dst)) {
>  			memcpy(&match->key.ipv6.dst, v6_spec->ip6dst,
>  			       sizeof(match->key.ipv6.dst));
>  			memcpy(&match->mask.ipv6.dst, v6_m_spec->ip6dst,
>  			       sizeof(match->mask.ipv6.dst));
>  		}
> -		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr)) ||
> -		    memcmp(v6_m_spec->ip6dst, &zero_addr, sizeof(zero_addr))) {
> +		if (!ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6src) ||
> +		    !ipv6_addr_any((struct in6_addr *)v6_m_spec->ip6dst)) {
>  			match->dissector.used_keys |=
>  				BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS);
>  			match->dissector.offset[FLOW_DISSECTOR_KEY_IPV6_ADDRS] =
> diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
> index 6edae3886885..e7391bf310a7 100644
> --- a/net/ipv4/inet_hashtables.c
> +++ b/net/ipv4/inet_hashtables.c
> @@ -826,13 +826,11 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
>  				      unsigned short port, int l3mdev, const struct sock *sk)
>  {
>  #if IS_ENABLED(CONFIG_IPV6)
> -	struct in6_addr addr_any = {};
> -
>  	if (sk->sk_family != tb->family) {
>  		if (sk->sk_family == AF_INET)
>  			return net_eq(ib2_net(tb), net) && tb->port == port &&
>  				tb->l3mdev == l3mdev &&
> -				ipv6_addr_equal(&tb->v6_rcv_saddr, &addr_any);
> +				ipv6_addr_any(&tb->v6_rcv_saddr);
>  
>  		return false;
>  	}
> @@ -840,7 +838,7 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
>  	if (sk->sk_family == AF_INET6)
>  		return net_eq(ib2_net(tb), net) && tb->port == port &&
>  			tb->l3mdev == l3mdev &&
> -			ipv6_addr_equal(&tb->v6_rcv_saddr, &addr_any);
> +			ipv6_addr_any(&tb->v6_rcv_saddr);
>  	else
>  #endif
>  		return net_eq(ib2_net(tb), net) && tb->port == port &&
> @@ -866,11 +864,10 @@ inet_bhash2_addr_any_hashbucket(const struct sock *sk, const struct net *net, in
>  {
>  	struct inet_hashinfo *hinfo = tcp_or_dccp_get_hashinfo(sk);
>  	u32 hash;
> -#if IS_ENABLED(CONFIG_IPV6)
> -	struct in6_addr addr_any = {};
>  
> +#if IS_ENABLED(CONFIG_IPV6)
>  	if (sk->sk_family == AF_INET6)
> -		hash = ipv6_portaddr_hash(net, &addr_any, port);
> +		hash = ipv6_portaddr_hash(net, &in6addr_any, port);
>  	else
>  #endif
>  		hash = ipv4_portaddr_hash(net, 0, port);

Thanks,
Reviewed-by: Mark Bloch <mbloch@nvidia.com>

Re: [PATCH v2 net-next 1/2] ipv6: Remove in6addr_any alternatives.

[David Ahern]

On 3/27/23 5:54 PM, Kuniyuki Iwashima wrote:
> Some code defines the IPv6 wildcard address as a local variable and
> use it with memcmp() or ipv6_addr_equal().
> 
> Let's use in6addr_any and ipv6_addr_any() instead.
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
> ---
>  .../net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c |  5 ++---
>  include/net/ip6_fib.h                                 |  9 +++------
>  include/trace/events/fib.h                            |  5 ++---
>  include/trace/events/fib6.h                           |  5 +----
>  net/ethtool/ioctl.c                                   | 10 +++++-----
>  net/ipv4/inet_hashtables.c                            | 11 ++++-------
>  6 files changed, 17 insertions(+), 28 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>

[PATCH v2 net-next 2/2] 6lowpan: Remove redundant initialisation.

[Kuniyuki Iwashima]

We'll call memset(&tmp, 0, sizeof(tmp)) later.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 net/6lowpan/iphc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
index 52fad5dad9f7..e116d308a8df 100644
--- a/net/6lowpan/iphc.c
+++ b/net/6lowpan/iphc.c
@@ -848,7 +848,7 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
 				   const struct lowpan_iphc_ctx *ctx,
 				   const unsigned char *lladdr, bool sam)
 {
-	struct in6_addr tmp = {};
+	struct in6_addr tmp;
 	u8 dam;
 
 	switch (lowpan_dev(dev)->lltype) {
-- 
2.30.2

Re: [PATCH v2 net-next 2/2] 6lowpan: Remove redundant initialisation.

[Mark Bloch]

On 28/03/2023 2:54, Kuniyuki Iwashima wrote:
> We'll call memset(&tmp, 0, sizeof(tmp)) later.

Why not just remove the first memset() then?

Mark

> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
> ---
>  net/6lowpan/iphc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
> index 52fad5dad9f7..e116d308a8df 100644
> --- a/net/6lowpan/iphc.c
> +++ b/net/6lowpan/iphc.c
> @@ -848,7 +848,7 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
>  				   const struct lowpan_iphc_ctx *ctx,
>  				   const unsigned char *lladdr, bool sam)
>  {
> -	struct in6_addr tmp = {};
> +	struct in6_addr tmp;
>  	u8 dam;
>  
>  	switch (lowpan_dev(dev)->lltype) {

Re: [PATCH v2 net-next 2/2] 6lowpan: Remove redundant initialisation.

[Kuniyuki Iwashima]

From:   Mark Bloch <mbloch@nvidia.com>
Date:   Tue, 28 Mar 2023 09:27:43 +0300
> On 28/03/2023 2:54, Kuniyuki Iwashima wrote:
> > We'll call memset(&tmp, 0, sizeof(tmp)) later.
> 
> Why not just remove the first memset() then?

The same pattern (memset(), init, compare) is repeated twice, and
I thought it's cleaner.  I don't have no strong preference though.

Also, we need not init it if we hit 'goto out' in the first switch.

---8<---
static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
				   const struct in6_addr *ipaddr,
				   const struct lowpan_iphc_ctx *ctx,
				   const unsigned char *lladdr, bool sam)
{
	struct in6_addr tmp;
	u8 dam;

	switch (lowpan_dev(dev)->lltype) {
	case LOWPAN_LLTYPE_IEEE802154:
		if (lowpan_iphc_compress_ctx_802154_lladdr(ipaddr, ctx,
							   lladdr)) {
			dam = LOWPAN_IPHC_DAM_11;
			goto out;
		}
		break;
	default:
		if (lowpan_iphc_addr_equal(dev, ctx, ipaddr, lladdr)) {
			dam = LOWPAN_IPHC_DAM_11;
			goto out;
		}
		break;
	}

	memset(&tmp, 0, sizeof(tmp));
	/* check for SAM/DAM = 10 */
	tmp.s6_addr[11] = 0xFF;
	tmp.s6_addr[12] = 0xFE;
	memcpy(&tmp.s6_addr[14], &ipaddr->s6_addr[14], 2);
	/* context information are always used */
	ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen);
	if (ipv6_addr_equal(&tmp, ipaddr)) {
		lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[14], 2);
		dam = LOWPAN_IPHC_DAM_10;
		goto out;
	}

	memset(&tmp, 0, sizeof(tmp));
	/* check for SAM/DAM = 01, should always match */
	memcpy(&tmp.s6_addr[8], &ipaddr->s6_addr[8], 8);
	/* context information are always used */
	ipv6_addr_prefix_copy(&tmp, &ctx->pfx, ctx->plen);
	if (ipv6_addr_equal(&tmp, ipaddr)) {
		lowpan_push_hc_data(hc_ptr, &ipaddr->s6_addr[8], 8);
		dam = LOWPAN_IPHC_DAM_01;
		goto out;
	}
...
}
---8<---


> 
> Mark
> 
> > 
> > Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
> > ---
> >  net/6lowpan/iphc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c
> > index 52fad5dad9f7..e116d308a8df 100644
> > --- a/net/6lowpan/iphc.c
> > +++ b/net/6lowpan/iphc.c
> > @@ -848,7 +848,7 @@ static u8 lowpan_compress_ctx_addr(u8 **hc_ptr, const struct net_device *dev,
> >  				   const struct lowpan_iphc_ctx *ctx,
> >  				   const unsigned char *lladdr, bool sam)
> >  {
> > -	struct in6_addr tmp = {};
> > +	struct in6_addr tmp;
> >  	u8 dam;
> >  
> >  	switch (lowpan_dev(dev)->lltype) {

Re: [PATCH v2 net-next 0/2] ipv6: Random cleanup for in6addr_any.

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Mon, 27 Mar 2023 16:54:53 -0700 you wrote:
> The first patch removes in6addr_any alternatives and the second
> removes redundant initialisation of a local variable.
> 
> 
> Changes:
>   v2: Use ipv6_addr_any() in patch 1. (David Ahern)
> 
> [...]

Here is the summary with links:
  - [v2,net-next,1/2] ipv6: Remove in6addr_any alternatives.
    https://git.kernel.org/netdev/net-next/c/8cdc3223e78c
  - [v2,net-next,2/2] 6lowpan: Remove redundant initialisation.
    https://git.kernel.org/netdev/net-next/c/be689c719eb6

You are awesome, thank you!
-- 
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