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xfrm: prefer secpath_set over secpath_dup 

secpath_set is a wrapper for secpath_dup that will not perform
an allocation if the secpath attached to the skb has a reference count
of one, i.e., it doesn't need to be COW'ed.

Also, secpath_dup doesn't attach the secpath to the skb, it leaves
this to the caller.

Use secpath_set in places that immediately assign the return value to
skb.

This allows to remove skb->sp without touching these spots again.

secpath_dup can eventually be removed in followup patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2018-12-18 17:15:26 +01:00 committed by David S. Miller
parent a053c86649
commit a84e3f5333
5 changed files with 19 additions and 17 deletions
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9
drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
View File

@ -1161,6 +1161,7 @@ void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
struct xfrm_state *xs = NULL;
struct ipv6hdr *ip6 = NULL;
struct iphdr *ip4 = NULL;
struct sec_path *sp;
void *daddr;
__be32 spi;
u8 *c_hdr;
@ -1200,12 +1201,12 @@ void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
if (unlikely(!xs))
return;
skb->sp = secpath_dup(skb->sp);
if (unlikely(!skb->sp))
sp = secpath_set(skb);
if (unlikely(!sp))
return;
skb->sp->xvec[skb->sp->len++] = xs;
skb->sp->olen++;
sp->xvec[sp->len++] = xs;
sp->olen++;
xo = xfrm_offload(skb);
xo->flags = CRYPTO_DONE;
xo->status = CRYPTO_SUCCESS;

9
drivers/net/ethernet/intel/ixgbevf/ipsec.c
View File

@ -548,6 +548,7 @@ void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
struct xfrm_state *xs = NULL;
struct ipv6hdr *ip6 = NULL;
struct iphdr *ip4 = NULL;
struct sec_path *sp;
void *daddr;
__be32 spi;
u8 *c_hdr;
@ -587,12 +588,12 @@ void ixgbevf_ipsec_rx(struct ixgbevf_ring *rx_ring,
if (unlikely(!xs))
return;
skb->sp = secpath_dup(skb->sp);
if (unlikely(!skb->sp))
sp = secpath_set(skb);
if (unlikely(!sp))
return;
skb->sp->xvec[skb->sp->len++] = xs;
skb->sp->olen++;
sp->xvec[sp->len++] = xs;
sp->olen++;
xo = xfrm_offload(skb);
xo->flags = CRYPTO_DONE;
xo->status = CRYPTO_SUCCESS;

10
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_rxtx.c
View File

@ -307,10 +307,11 @@ mlx5e_ipsec_build_sp(struct net_device *netdev, struct sk_buff *skb,
struct mlx5e_priv *priv = netdev_priv(netdev);
struct xfrm_offload *xo;
struct xfrm_state *xs;
struct sec_path *sp;
u32 sa_handle;
skb->sp = secpath_dup(skb->sp);
if (unlikely(!skb->sp)) {
sp = secpath_set(skb);
if (unlikely(!sp)) {
atomic64_inc(&priv->ipsec->sw_stats.ipsec_rx_drop_sp_alloc);
return NULL;
}
@ -322,8 +323,9 @@ mlx5e_ipsec_build_sp(struct net_device *netdev, struct sk_buff *skb,
return NULL;
}
skb->sp->xvec[skb->sp->len++] = xs;
skb->sp->olen++;
sp = skb_sec_path(skb);
sp->xvec[sp->len++] = xs;
sp->olen++;
xo = xfrm_offload(skb);
xo->flags = CRYPTO_DONE;

1
net/xfrm/Kconfig
View File

@ -5,6 +5,7 @@ config XFRM
bool
depends on NET
select GRO_CELLS
select SKB_EXTENSIONS
config XFRM_OFFLOAD
bool

7
net/xfrm/xfrm_output.c
View File

@ -218,19 +218,16 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
if (xfrm_dev_offload_ok(skb, x)) {
struct sec_path *sp;
sp = secpath_dup(skb->sp);
sp = secpath_set(skb);
if (!sp) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
kfree_skb(skb);
return -ENOMEM;
}
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
skb->encapsulation = 1;
sp->olen++;
sp->xvec[skb->sp->len++] = x;
sp->xvec[sp->len++] = x;
xfrm_state_hold(x);
if (skb_is_gso(skb)) {