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ip_gre: Make GRE and GRETAP devices always NETIF_F_LLTX 

Recently we made o_seqno atomic_t.  Stop special-casing TUNNEL_SEQ, and
always mark GRE[TAP] devices as NETIF_F_LLTX, since we no longer need
the TX lock (&txq->_xmit_lock).

Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Peilin Ye 2022-04-28 22:25:21 -07:00 committed by Paolo Abeni
parent 6e28f56c0d
commit 020e8f60aa
1 changed files with 22 additions and 28 deletions
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50
net/ipv4/ip_gre.c
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@ -748,6 +748,7 @@ free_skb:
static void ipgre_link_update(struct net_device *dev, bool set_mtu)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
__be16 flags;
int len;
len = tunnel->tun_hlen;
@ -763,19 +764,15 @@ static void ipgre_link_update(struct net_device *dev, bool set_mtu)
if (set_mtu)
dev->mtu = max_t(int, dev->mtu - len, 68);
if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||
tunnel->encap.type == TUNNEL_ENCAP_NONE) {
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
} else {
dev->features &= ~NETIF_F_GSO_SOFTWARE;
dev->hw_features &= ~NETIF_F_GSO_SOFTWARE;
}
dev->features |= NETIF_F_LLTX;
} else {
flags = tunnel->parms.o_flags;
if (flags & TUNNEL_SEQ ||
(flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE)) {
dev->features &= ~NETIF_F_GSO_SOFTWARE;
dev->hw_features &= ~NETIF_F_GSO_SOFTWARE;
dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE);
} else {
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
}
}
@ -949,6 +946,7 @@ static void ipgre_tunnel_setup(struct net_device *dev)
static void __gre_tunnel_init(struct net_device *dev)
{
struct ip_tunnel *tunnel;
__be16 flags;
tunnel = netdev_priv(dev);
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
@ -957,25 +955,21 @@ static void __gre_tunnel_init(struct net_device *dev)
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph);
dev->features |= GRE_FEATURES;
dev->features |= GRE_FEATURES | NETIF_F_LLTX;
dev->hw_features |= GRE_FEATURES;
if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
/* TCP offload with GRE SEQ is not supported, nor
* can we support 2 levels of outer headers requiring
* an update.
*/
if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||
(tunnel->encap.type == TUNNEL_ENCAP_NONE)) {
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
}
flags = tunnel->parms.o_flags;
/* Can use a lockless transmit, unless we generate
* output sequences
*/
dev->features |= NETIF_F_LLTX;
}
/* TCP offload with GRE SEQ is not supported, nor can we support 2
* levels of outer headers requiring an update.
*/
if (flags & TUNNEL_SEQ)
return;
if (flags & TUNNEL_CSUM && tunnel->encap.type != TUNNEL_ENCAP_NONE)
return;
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
}
static int ipgre_tunnel_init(struct net_device *dev)