[PATCH bpf-next 3/3] veth: allow jumbo frames in xdp mode
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: 2022-02-11 01:21:25
Also in:
bpf
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Allow increasing the MTU over page boundaries on veth devices if the attached xdp program declares to support xdp fragments. Enable NETIF_F_ALL_TSO when the device is running in xdp mode. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> --- drivers/net/veth.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 6419de5d1f49..d6ebbfe52969 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c@@ -1498,7 +1498,6 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, struct veth_priv *priv = netdev_priv(dev); struct bpf_prog *old_prog; struct net_device *peer; - unsigned int max_mtu; int err; old_prog = priv->_xdp_prog;
@@ -1506,6 +1505,8 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, peer = rtnl_dereference(priv->peer); if (prog) { + unsigned int max_mtu; + if (!peer) { NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached"); err = -ENOTCONN;
@@ -1515,9 +1516,9 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM - peer->hard_header_len - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); - if (peer->mtu > max_mtu) { - NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP"); - err = -ERANGE; + if (!prog->aux->xdp_has_frags && peer->mtu > max_mtu) { + NL_SET_ERR_MSG_MOD(extack, "prog does not support XDP frags"); + err = -EOPNOTSUPP; goto err; }
@@ -1535,10 +1536,8 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, } } - if (!old_prog) { - peer->hw_features &= ~NETIF_F_GSO_SOFTWARE; - peer->max_mtu = max_mtu; - } + if (!old_prog) + peer->hw_features &= ~NETIF_F_GSO_FRAGLIST; } if (old_prog) {
@@ -1546,10 +1545,8 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, if (dev->flags & IFF_UP) veth_disable_xdp(dev); - if (peer) { - peer->hw_features |= NETIF_F_GSO_SOFTWARE; - peer->max_mtu = ETH_MAX_MTU; - } + if (peer) + peer->hw_features |= NETIF_F_GSO_FRAGLIST; } bpf_prog_put(old_prog); }
--
2.34.1