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726e2c5929
After feeding a decapsulated packet to a veth device with act_mirred,
skb_headlen() may be 0. But veth_xmit() calls __dev_forward_skb(),
which expects at least ETH_HLEN byte of linear data (as
__dev_forward_skb2() calls eth_type_trans(), which pulls ETH_HLEN bytes
unconditionally).
Use pskb_may_pull() to ensure veth_xmit() respects this constraint.
kernel BUG at include/linux/skbuff.h:2328!
RIP: 0010:eth_type_trans+0xcf/0x140
Call Trace:
<IRQ>
__dev_forward_skb2+0xe3/0x160
veth_xmit+0x6e/0x250 [veth]
dev_hard_start_xmit+0xc7/0x200
__dev_queue_xmit+0x47f/0x520
? skb_ensure_writable+0x85/0xa0
? skb_mpls_pop+0x98/0x1c0
tcf_mirred_act+0x442/0x47e [act_mirred]
tcf_action_exec+0x86/0x140
fl_classify+0x1d8/0x1e0 [cls_flower]
? dma_pte_clear_level+0x129/0x1a0
? dma_pte_clear_level+0x129/0x1a0
? prb_fill_curr_block+0x2f/0xc0
? skb_copy_bits+0x11a/0x220
__tcf_classify+0x58/0x110
tcf_classify_ingress+0x6b/0x140
__netif_receive_skb_core.constprop.0+0x47d/0xfd0
? __iommu_dma_unmap_swiotlb+0x44/0x90
__netif_receive_skb_one_core+0x3d/0xa0
netif_receive_skb+0x116/0x170
be_process_rx+0x22f/0x330 [be2net]
be_poll+0x13c/0x370 [be2net]
__napi_poll+0x2a/0x170
net_rx_action+0x22f/0x2f0
__do_softirq+0xca/0x2a8
__irq_exit_rcu+0xc1/0xe0
common_interrupt+0x83/0xa0
Fixes: e314dbdc1c
("[NET]: Virtual ethernet device driver.")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1911 lines
44 KiB
C
1911 lines
44 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/net/veth.c
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*
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* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
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*
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* Author: Pavel Emelianov <xemul@openvz.org>
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* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
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*
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*/
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/u64_stats_sync.h>
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#include <net/rtnetlink.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <net/xdp.h>
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#include <linux/veth.h>
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#include <linux/module.h>
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/ptr_ring.h>
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#include <linux/bpf_trace.h>
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#include <linux/net_tstamp.h>
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#define DRV_NAME "veth"
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#define DRV_VERSION "1.0"
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#define VETH_XDP_FLAG BIT(0)
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#define VETH_RING_SIZE 256
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#define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN)
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#define VETH_XDP_TX_BULK_SIZE 16
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#define VETH_XDP_BATCH 16
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struct veth_stats {
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u64 rx_drops;
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/* xdp */
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u64 xdp_packets;
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u64 xdp_bytes;
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u64 xdp_redirect;
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u64 xdp_drops;
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u64 xdp_tx;
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u64 xdp_tx_err;
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u64 peer_tq_xdp_xmit;
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u64 peer_tq_xdp_xmit_err;
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};
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struct veth_rq_stats {
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struct veth_stats vs;
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struct u64_stats_sync syncp;
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};
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struct veth_rq {
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struct napi_struct xdp_napi;
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struct napi_struct __rcu *napi; /* points to xdp_napi when the latter is initialized */
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struct net_device *dev;
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struct bpf_prog __rcu *xdp_prog;
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struct xdp_mem_info xdp_mem;
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struct veth_rq_stats stats;
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bool rx_notify_masked;
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struct ptr_ring xdp_ring;
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struct xdp_rxq_info xdp_rxq;
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};
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struct veth_priv {
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struct net_device __rcu *peer;
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atomic64_t dropped;
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struct bpf_prog *_xdp_prog;
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struct veth_rq *rq;
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unsigned int requested_headroom;
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};
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struct veth_xdp_tx_bq {
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struct xdp_frame *q[VETH_XDP_TX_BULK_SIZE];
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unsigned int count;
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};
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/*
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* ethtool interface
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*/
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struct veth_q_stat_desc {
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char desc[ETH_GSTRING_LEN];
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size_t offset;
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};
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#define VETH_RQ_STAT(m) offsetof(struct veth_stats, m)
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static const struct veth_q_stat_desc veth_rq_stats_desc[] = {
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{ "xdp_packets", VETH_RQ_STAT(xdp_packets) },
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{ "xdp_bytes", VETH_RQ_STAT(xdp_bytes) },
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{ "drops", VETH_RQ_STAT(rx_drops) },
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{ "xdp_redirect", VETH_RQ_STAT(xdp_redirect) },
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{ "xdp_drops", VETH_RQ_STAT(xdp_drops) },
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{ "xdp_tx", VETH_RQ_STAT(xdp_tx) },
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{ "xdp_tx_errors", VETH_RQ_STAT(xdp_tx_err) },
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};
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#define VETH_RQ_STATS_LEN ARRAY_SIZE(veth_rq_stats_desc)
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static const struct veth_q_stat_desc veth_tq_stats_desc[] = {
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{ "xdp_xmit", VETH_RQ_STAT(peer_tq_xdp_xmit) },
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{ "xdp_xmit_errors", VETH_RQ_STAT(peer_tq_xdp_xmit_err) },
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};
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#define VETH_TQ_STATS_LEN ARRAY_SIZE(veth_tq_stats_desc)
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static struct {
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const char string[ETH_GSTRING_LEN];
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} ethtool_stats_keys[] = {
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{ "peer_ifindex" },
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};
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static int veth_get_link_ksettings(struct net_device *dev,
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struct ethtool_link_ksettings *cmd)
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{
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cmd->base.speed = SPEED_10000;
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cmd->base.duplex = DUPLEX_FULL;
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cmd->base.port = PORT_TP;
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cmd->base.autoneg = AUTONEG_DISABLE;
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return 0;
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}
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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}
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static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
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{
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u8 *p = buf;
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int i, j;
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switch(stringset) {
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case ETH_SS_STATS:
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memcpy(p, ðtool_stats_keys, sizeof(ethtool_stats_keys));
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p += sizeof(ethtool_stats_keys);
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for (i = 0; i < dev->real_num_rx_queues; i++)
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for (j = 0; j < VETH_RQ_STATS_LEN; j++)
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ethtool_sprintf(&p, "rx_queue_%u_%.18s",
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i, veth_rq_stats_desc[j].desc);
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for (i = 0; i < dev->real_num_tx_queues; i++)
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for (j = 0; j < VETH_TQ_STATS_LEN; j++)
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ethtool_sprintf(&p, "tx_queue_%u_%.18s",
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i, veth_tq_stats_desc[j].desc);
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break;
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}
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}
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static int veth_get_sset_count(struct net_device *dev, int sset)
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{
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switch (sset) {
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case ETH_SS_STATS:
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return ARRAY_SIZE(ethtool_stats_keys) +
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VETH_RQ_STATS_LEN * dev->real_num_rx_queues +
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VETH_TQ_STATS_LEN * dev->real_num_tx_queues;
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default:
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return -EOPNOTSUPP;
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}
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}
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static void veth_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats, u64 *data)
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{
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struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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int i, j, idx;
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data[0] = peer ? peer->ifindex : 0;
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idx = 1;
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for (i = 0; i < dev->real_num_rx_queues; i++) {
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const struct veth_rq_stats *rq_stats = &priv->rq[i].stats;
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const void *stats_base = (void *)&rq_stats->vs;
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unsigned int start;
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size_t offset;
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do {
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start = u64_stats_fetch_begin_irq(&rq_stats->syncp);
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for (j = 0; j < VETH_RQ_STATS_LEN; j++) {
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offset = veth_rq_stats_desc[j].offset;
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data[idx + j] = *(u64 *)(stats_base + offset);
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}
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} while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start));
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idx += VETH_RQ_STATS_LEN;
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}
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if (!peer)
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return;
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rcv_priv = netdev_priv(peer);
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for (i = 0; i < peer->real_num_rx_queues; i++) {
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const struct veth_rq_stats *rq_stats = &rcv_priv->rq[i].stats;
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const void *base = (void *)&rq_stats->vs;
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unsigned int start, tx_idx = idx;
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size_t offset;
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tx_idx += (i % dev->real_num_tx_queues) * VETH_TQ_STATS_LEN;
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do {
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start = u64_stats_fetch_begin_irq(&rq_stats->syncp);
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for (j = 0; j < VETH_TQ_STATS_LEN; j++) {
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offset = veth_tq_stats_desc[j].offset;
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data[tx_idx + j] += *(u64 *)(base + offset);
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}
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} while (u64_stats_fetch_retry_irq(&rq_stats->syncp, start));
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}
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}
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static void veth_get_channels(struct net_device *dev,
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struct ethtool_channels *channels)
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{
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channels->tx_count = dev->real_num_tx_queues;
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channels->rx_count = dev->real_num_rx_queues;
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channels->max_tx = dev->num_tx_queues;
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channels->max_rx = dev->num_rx_queues;
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}
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static int veth_set_channels(struct net_device *dev,
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struct ethtool_channels *ch);
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static const struct ethtool_ops veth_ethtool_ops = {
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.get_drvinfo = veth_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_strings = veth_get_strings,
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.get_sset_count = veth_get_sset_count,
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.get_ethtool_stats = veth_get_ethtool_stats,
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.get_link_ksettings = veth_get_link_ksettings,
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.get_ts_info = ethtool_op_get_ts_info,
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.get_channels = veth_get_channels,
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.set_channels = veth_set_channels,
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};
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/* general routines */
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static bool veth_is_xdp_frame(void *ptr)
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{
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return (unsigned long)ptr & VETH_XDP_FLAG;
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}
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static struct xdp_frame *veth_ptr_to_xdp(void *ptr)
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{
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return (void *)((unsigned long)ptr & ~VETH_XDP_FLAG);
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}
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static void *veth_xdp_to_ptr(struct xdp_frame *xdp)
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{
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return (void *)((unsigned long)xdp | VETH_XDP_FLAG);
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}
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static void veth_ptr_free(void *ptr)
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{
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if (veth_is_xdp_frame(ptr))
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xdp_return_frame(veth_ptr_to_xdp(ptr));
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else
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kfree_skb(ptr);
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}
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static void __veth_xdp_flush(struct veth_rq *rq)
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{
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/* Write ptr_ring before reading rx_notify_masked */
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smp_mb();
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if (!READ_ONCE(rq->rx_notify_masked) &&
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napi_schedule_prep(&rq->xdp_napi)) {
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WRITE_ONCE(rq->rx_notify_masked, true);
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__napi_schedule(&rq->xdp_napi);
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}
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}
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static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb)
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{
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if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) {
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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return NET_RX_SUCCESS;
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}
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static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb,
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struct veth_rq *rq, bool xdp)
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{
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return __dev_forward_skb(dev, skb) ?: xdp ?
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veth_xdp_rx(rq, skb) :
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__netif_rx(skb);
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}
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/* return true if the specified skb has chances of GRO aggregation
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* Don't strive for accuracy, but try to avoid GRO overhead in the most
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* common scenarios.
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* When XDP is enabled, all traffic is considered eligible, as the xmit
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* device has TSO off.
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* When TSO is enabled on the xmit device, we are likely interested only
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* in UDP aggregation, explicitly check for that if the skb is suspected
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* - the sock_wfree destructor is used by UDP, ICMP and XDP sockets -
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* to belong to locally generated UDP traffic.
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*/
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static bool veth_skb_is_eligible_for_gro(const struct net_device *dev,
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const struct net_device *rcv,
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const struct sk_buff *skb)
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{
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return !(dev->features & NETIF_F_ALL_TSO) ||
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(skb->destructor == sock_wfree &&
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rcv->features & (NETIF_F_GRO_FRAGLIST | NETIF_F_GRO_UDP_FWD));
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}
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static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
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struct veth_rq *rq = NULL;
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struct net_device *rcv;
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int length = skb->len;
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bool use_napi = false;
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int rxq;
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rcu_read_lock();
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rcv = rcu_dereference(priv->peer);
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if (unlikely(!rcv) || !pskb_may_pull(skb, ETH_HLEN)) {
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kfree_skb(skb);
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goto drop;
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}
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rcv_priv = netdev_priv(rcv);
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rxq = skb_get_queue_mapping(skb);
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if (rxq < rcv->real_num_rx_queues) {
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rq = &rcv_priv->rq[rxq];
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/* The napi pointer is available when an XDP program is
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* attached or when GRO is enabled
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* Don't bother with napi/GRO if the skb can't be aggregated
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*/
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use_napi = rcu_access_pointer(rq->napi) &&
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veth_skb_is_eligible_for_gro(dev, rcv, skb);
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}
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skb_tx_timestamp(skb);
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if (likely(veth_forward_skb(rcv, skb, rq, use_napi) == NET_RX_SUCCESS)) {
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if (!use_napi)
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dev_lstats_add(dev, length);
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} else {
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drop:
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atomic64_inc(&priv->dropped);
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}
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if (use_napi)
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__veth_xdp_flush(rq);
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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static u64 veth_stats_tx(struct net_device *dev, u64 *packets, u64 *bytes)
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{
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struct veth_priv *priv = netdev_priv(dev);
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dev_lstats_read(dev, packets, bytes);
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return atomic64_read(&priv->dropped);
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}
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static void veth_stats_rx(struct veth_stats *result, struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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int i;
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result->peer_tq_xdp_xmit_err = 0;
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result->xdp_packets = 0;
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result->xdp_tx_err = 0;
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result->xdp_bytes = 0;
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result->rx_drops = 0;
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for (i = 0; i < dev->num_rx_queues; i++) {
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u64 packets, bytes, drops, xdp_tx_err, peer_tq_xdp_xmit_err;
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struct veth_rq_stats *stats = &priv->rq[i].stats;
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_irq(&stats->syncp);
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peer_tq_xdp_xmit_err = stats->vs.peer_tq_xdp_xmit_err;
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xdp_tx_err = stats->vs.xdp_tx_err;
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packets = stats->vs.xdp_packets;
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bytes = stats->vs.xdp_bytes;
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drops = stats->vs.rx_drops;
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} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
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result->peer_tq_xdp_xmit_err += peer_tq_xdp_xmit_err;
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result->xdp_tx_err += xdp_tx_err;
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result->xdp_packets += packets;
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result->xdp_bytes += bytes;
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result->rx_drops += drops;
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}
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}
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static void veth_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer;
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struct veth_stats rx;
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u64 packets, bytes;
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tot->tx_dropped = veth_stats_tx(dev, &packets, &bytes);
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tot->tx_bytes = bytes;
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tot->tx_packets = packets;
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veth_stats_rx(&rx, dev);
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tot->tx_dropped += rx.xdp_tx_err;
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tot->rx_dropped = rx.rx_drops + rx.peer_tq_xdp_xmit_err;
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tot->rx_bytes = rx.xdp_bytes;
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tot->rx_packets = rx.xdp_packets;
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rcu_read_lock();
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peer = rcu_dereference(priv->peer);
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if (peer) {
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veth_stats_tx(peer, &packets, &bytes);
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tot->rx_bytes += bytes;
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tot->rx_packets += packets;
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veth_stats_rx(&rx, peer);
|
|
tot->tx_dropped += rx.peer_tq_xdp_xmit_err;
|
|
tot->rx_dropped += rx.xdp_tx_err;
|
|
tot->tx_bytes += rx.xdp_bytes;
|
|
tot->tx_packets += rx.xdp_packets;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* fake multicast ability */
|
|
static void veth_set_multicast_list(struct net_device *dev)
|
|
{
|
|
}
|
|
|
|
static int veth_select_rxq(struct net_device *dev)
|
|
{
|
|
return smp_processor_id() % dev->real_num_rx_queues;
|
|
}
|
|
|
|
static struct net_device *veth_peer_dev(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
|
|
/* Callers must be under RCU read side. */
|
|
return rcu_dereference(priv->peer);
|
|
}
|
|
|
|
static int veth_xdp_xmit(struct net_device *dev, int n,
|
|
struct xdp_frame **frames,
|
|
u32 flags, bool ndo_xmit)
|
|
{
|
|
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
|
|
int i, ret = -ENXIO, nxmit = 0;
|
|
struct net_device *rcv;
|
|
unsigned int max_len;
|
|
struct veth_rq *rq;
|
|
|
|
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
|
|
return -EINVAL;
|
|
|
|
rcu_read_lock();
|
|
rcv = rcu_dereference(priv->peer);
|
|
if (unlikely(!rcv))
|
|
goto out;
|
|
|
|
rcv_priv = netdev_priv(rcv);
|
|
rq = &rcv_priv->rq[veth_select_rxq(rcv)];
|
|
/* The napi pointer is set if NAPI is enabled, which ensures that
|
|
* xdp_ring is initialized on receive side and the peer device is up.
|
|
*/
|
|
if (!rcu_access_pointer(rq->napi))
|
|
goto out;
|
|
|
|
max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN;
|
|
|
|
spin_lock(&rq->xdp_ring.producer_lock);
|
|
for (i = 0; i < n; i++) {
|
|
struct xdp_frame *frame = frames[i];
|
|
void *ptr = veth_xdp_to_ptr(frame);
|
|
|
|
if (unlikely(xdp_get_frame_len(frame) > max_len ||
|
|
__ptr_ring_produce(&rq->xdp_ring, ptr)))
|
|
break;
|
|
nxmit++;
|
|
}
|
|
spin_unlock(&rq->xdp_ring.producer_lock);
|
|
|
|
if (flags & XDP_XMIT_FLUSH)
|
|
__veth_xdp_flush(rq);
|
|
|
|
ret = nxmit;
|
|
if (ndo_xmit) {
|
|
u64_stats_update_begin(&rq->stats.syncp);
|
|
rq->stats.vs.peer_tq_xdp_xmit += nxmit;
|
|
rq->stats.vs.peer_tq_xdp_xmit_err += n - nxmit;
|
|
u64_stats_update_end(&rq->stats.syncp);
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int veth_ndo_xdp_xmit(struct net_device *dev, int n,
|
|
struct xdp_frame **frames, u32 flags)
|
|
{
|
|
int err;
|
|
|
|
err = veth_xdp_xmit(dev, n, frames, flags, true);
|
|
if (err < 0) {
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
|
|
atomic64_add(n, &priv->dropped);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void veth_xdp_flush_bq(struct veth_rq *rq, struct veth_xdp_tx_bq *bq)
|
|
{
|
|
int sent, i, err = 0, drops;
|
|
|
|
sent = veth_xdp_xmit(rq->dev, bq->count, bq->q, 0, false);
|
|
if (sent < 0) {
|
|
err = sent;
|
|
sent = 0;
|
|
}
|
|
|
|
for (i = sent; unlikely(i < bq->count); i++)
|
|
xdp_return_frame(bq->q[i]);
|
|
|
|
drops = bq->count - sent;
|
|
trace_xdp_bulk_tx(rq->dev, sent, drops, err);
|
|
|
|
u64_stats_update_begin(&rq->stats.syncp);
|
|
rq->stats.vs.xdp_tx += sent;
|
|
rq->stats.vs.xdp_tx_err += drops;
|
|
u64_stats_update_end(&rq->stats.syncp);
|
|
|
|
bq->count = 0;
|
|
}
|
|
|
|
static void veth_xdp_flush(struct veth_rq *rq, struct veth_xdp_tx_bq *bq)
|
|
{
|
|
struct veth_priv *rcv_priv, *priv = netdev_priv(rq->dev);
|
|
struct net_device *rcv;
|
|
struct veth_rq *rcv_rq;
|
|
|
|
rcu_read_lock();
|
|
veth_xdp_flush_bq(rq, bq);
|
|
rcv = rcu_dereference(priv->peer);
|
|
if (unlikely(!rcv))
|
|
goto out;
|
|
|
|
rcv_priv = netdev_priv(rcv);
|
|
rcv_rq = &rcv_priv->rq[veth_select_rxq(rcv)];
|
|
/* xdp_ring is initialized on receive side? */
|
|
if (unlikely(!rcu_access_pointer(rcv_rq->xdp_prog)))
|
|
goto out;
|
|
|
|
__veth_xdp_flush(rcv_rq);
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int veth_xdp_tx(struct veth_rq *rq, struct xdp_buff *xdp,
|
|
struct veth_xdp_tx_bq *bq)
|
|
{
|
|
struct xdp_frame *frame = xdp_convert_buff_to_frame(xdp);
|
|
|
|
if (unlikely(!frame))
|
|
return -EOVERFLOW;
|
|
|
|
if (unlikely(bq->count == VETH_XDP_TX_BULK_SIZE))
|
|
veth_xdp_flush_bq(rq, bq);
|
|
|
|
bq->q[bq->count++] = frame;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq,
|
|
struct xdp_frame *frame,
|
|
struct veth_xdp_tx_bq *bq,
|
|
struct veth_stats *stats)
|
|
{
|
|
struct xdp_frame orig_frame;
|
|
struct bpf_prog *xdp_prog;
|
|
|
|
rcu_read_lock();
|
|
xdp_prog = rcu_dereference(rq->xdp_prog);
|
|
if (likely(xdp_prog)) {
|
|
struct xdp_buff xdp;
|
|
u32 act;
|
|
|
|
xdp_convert_frame_to_buff(frame, &xdp);
|
|
xdp.rxq = &rq->xdp_rxq;
|
|
|
|
act = bpf_prog_run_xdp(xdp_prog, &xdp);
|
|
|
|
switch (act) {
|
|
case XDP_PASS:
|
|
if (xdp_update_frame_from_buff(&xdp, frame))
|
|
goto err_xdp;
|
|
break;
|
|
case XDP_TX:
|
|
orig_frame = *frame;
|
|
xdp.rxq->mem = frame->mem;
|
|
if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) {
|
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
|
frame = &orig_frame;
|
|
stats->rx_drops++;
|
|
goto err_xdp;
|
|
}
|
|
stats->xdp_tx++;
|
|
rcu_read_unlock();
|
|
goto xdp_xmit;
|
|
case XDP_REDIRECT:
|
|
orig_frame = *frame;
|
|
xdp.rxq->mem = frame->mem;
|
|
if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) {
|
|
frame = &orig_frame;
|
|
stats->rx_drops++;
|
|
goto err_xdp;
|
|
}
|
|
stats->xdp_redirect++;
|
|
rcu_read_unlock();
|
|
goto xdp_xmit;
|
|
default:
|
|
bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act);
|
|
fallthrough;
|
|
case XDP_ABORTED:
|
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
|
fallthrough;
|
|
case XDP_DROP:
|
|
stats->xdp_drops++;
|
|
goto err_xdp;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return frame;
|
|
err_xdp:
|
|
rcu_read_unlock();
|
|
xdp_return_frame(frame);
|
|
xdp_xmit:
|
|
return NULL;
|
|
}
|
|
|
|
/* frames array contains VETH_XDP_BATCH at most */
|
|
static void veth_xdp_rcv_bulk_skb(struct veth_rq *rq, void **frames,
|
|
int n_xdpf, struct veth_xdp_tx_bq *bq,
|
|
struct veth_stats *stats)
|
|
{
|
|
void *skbs[VETH_XDP_BATCH];
|
|
int i;
|
|
|
|
if (xdp_alloc_skb_bulk(skbs, n_xdpf,
|
|
GFP_ATOMIC | __GFP_ZERO) < 0) {
|
|
for (i = 0; i < n_xdpf; i++)
|
|
xdp_return_frame(frames[i]);
|
|
stats->rx_drops += n_xdpf;
|
|
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < n_xdpf; i++) {
|
|
struct sk_buff *skb = skbs[i];
|
|
|
|
skb = __xdp_build_skb_from_frame(frames[i], skb,
|
|
rq->dev);
|
|
if (!skb) {
|
|
xdp_return_frame(frames[i]);
|
|
stats->rx_drops++;
|
|
continue;
|
|
}
|
|
napi_gro_receive(&rq->xdp_napi, skb);
|
|
}
|
|
}
|
|
|
|
static void veth_xdp_get(struct xdp_buff *xdp)
|
|
{
|
|
struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
|
|
int i;
|
|
|
|
get_page(virt_to_page(xdp->data));
|
|
if (likely(!xdp_buff_has_frags(xdp)))
|
|
return;
|
|
|
|
for (i = 0; i < sinfo->nr_frags; i++)
|
|
__skb_frag_ref(&sinfo->frags[i]);
|
|
}
|
|
|
|
static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
|
|
struct xdp_buff *xdp,
|
|
struct sk_buff **pskb)
|
|
{
|
|
struct sk_buff *skb = *pskb;
|
|
u32 frame_sz;
|
|
|
|
if (skb_shared(skb) || skb_head_is_locked(skb) ||
|
|
skb_shinfo(skb)->nr_frags) {
|
|
u32 size, len, max_head_size, off;
|
|
struct sk_buff *nskb;
|
|
struct page *page;
|
|
int i, head_off;
|
|
|
|
/* We need a private copy of the skb and data buffers since
|
|
* the ebpf program can modify it. We segment the original skb
|
|
* into order-0 pages without linearize it.
|
|
*
|
|
* Make sure we have enough space for linear and paged area
|
|
*/
|
|
max_head_size = SKB_WITH_OVERHEAD(PAGE_SIZE -
|
|
VETH_XDP_HEADROOM);
|
|
if (skb->len > PAGE_SIZE * MAX_SKB_FRAGS + max_head_size)
|
|
goto drop;
|
|
|
|
/* Allocate skb head */
|
|
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
|
|
if (!page)
|
|
goto drop;
|
|
|
|
nskb = build_skb(page_address(page), PAGE_SIZE);
|
|
if (!nskb) {
|
|
put_page(page);
|
|
goto drop;
|
|
}
|
|
|
|
skb_reserve(nskb, VETH_XDP_HEADROOM);
|
|
size = min_t(u32, skb->len, max_head_size);
|
|
if (skb_copy_bits(skb, 0, nskb->data, size)) {
|
|
consume_skb(nskb);
|
|
goto drop;
|
|
}
|
|
skb_put(nskb, size);
|
|
|
|
skb_copy_header(nskb, skb);
|
|
head_off = skb_headroom(nskb) - skb_headroom(skb);
|
|
skb_headers_offset_update(nskb, head_off);
|
|
|
|
/* Allocate paged area of new skb */
|
|
off = size;
|
|
len = skb->len - off;
|
|
|
|
for (i = 0; i < MAX_SKB_FRAGS && off < skb->len; i++) {
|
|
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
|
|
if (!page) {
|
|
consume_skb(nskb);
|
|
goto drop;
|
|
}
|
|
|
|
size = min_t(u32, len, PAGE_SIZE);
|
|
skb_add_rx_frag(nskb, i, page, 0, size, PAGE_SIZE);
|
|
if (skb_copy_bits(skb, off, page_address(page),
|
|
size)) {
|
|
consume_skb(nskb);
|
|
goto drop;
|
|
}
|
|
|
|
len -= size;
|
|
off += size;
|
|
}
|
|
|
|
consume_skb(skb);
|
|
skb = nskb;
|
|
} else if (skb_headroom(skb) < XDP_PACKET_HEADROOM &&
|
|
pskb_expand_head(skb, VETH_XDP_HEADROOM, 0, GFP_ATOMIC)) {
|
|
goto drop;
|
|
}
|
|
|
|
/* SKB "head" area always have tailroom for skb_shared_info */
|
|
frame_sz = skb_end_pointer(skb) - skb->head;
|
|
frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
|
xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq);
|
|
xdp_prepare_buff(xdp, skb->head, skb_headroom(skb),
|
|
skb_headlen(skb), true);
|
|
|
|
if (skb_is_nonlinear(skb)) {
|
|
skb_shinfo(skb)->xdp_frags_size = skb->data_len;
|
|
xdp_buff_set_frags_flag(xdp);
|
|
} else {
|
|
xdp_buff_clear_frags_flag(xdp);
|
|
}
|
|
*pskb = skb;
|
|
|
|
return 0;
|
|
drop:
|
|
consume_skb(skb);
|
|
*pskb = NULL;
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
|
|
struct sk_buff *skb,
|
|
struct veth_xdp_tx_bq *bq,
|
|
struct veth_stats *stats)
|
|
{
|
|
void *orig_data, *orig_data_end;
|
|
struct bpf_prog *xdp_prog;
|
|
struct xdp_buff xdp;
|
|
u32 act, metalen;
|
|
int off;
|
|
|
|
skb_prepare_for_gro(skb);
|
|
|
|
rcu_read_lock();
|
|
xdp_prog = rcu_dereference(rq->xdp_prog);
|
|
if (unlikely(!xdp_prog)) {
|
|
rcu_read_unlock();
|
|
goto out;
|
|
}
|
|
|
|
__skb_push(skb, skb->data - skb_mac_header(skb));
|
|
if (veth_convert_skb_to_xdp_buff(rq, &xdp, &skb))
|
|
goto drop;
|
|
|
|
orig_data = xdp.data;
|
|
orig_data_end = xdp.data_end;
|
|
|
|
act = bpf_prog_run_xdp(xdp_prog, &xdp);
|
|
|
|
switch (act) {
|
|
case XDP_PASS:
|
|
break;
|
|
case XDP_TX:
|
|
veth_xdp_get(&xdp);
|
|
consume_skb(skb);
|
|
xdp.rxq->mem = rq->xdp_mem;
|
|
if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) {
|
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
|
stats->rx_drops++;
|
|
goto err_xdp;
|
|
}
|
|
stats->xdp_tx++;
|
|
rcu_read_unlock();
|
|
goto xdp_xmit;
|
|
case XDP_REDIRECT:
|
|
veth_xdp_get(&xdp);
|
|
consume_skb(skb);
|
|
xdp.rxq->mem = rq->xdp_mem;
|
|
if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) {
|
|
stats->rx_drops++;
|
|
goto err_xdp;
|
|
}
|
|
stats->xdp_redirect++;
|
|
rcu_read_unlock();
|
|
goto xdp_xmit;
|
|
default:
|
|
bpf_warn_invalid_xdp_action(rq->dev, xdp_prog, act);
|
|
fallthrough;
|
|
case XDP_ABORTED:
|
|
trace_xdp_exception(rq->dev, xdp_prog, act);
|
|
fallthrough;
|
|
case XDP_DROP:
|
|
stats->xdp_drops++;
|
|
goto xdp_drop;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/* check if bpf_xdp_adjust_head was used */
|
|
off = orig_data - xdp.data;
|
|
if (off > 0)
|
|
__skb_push(skb, off);
|
|
else if (off < 0)
|
|
__skb_pull(skb, -off);
|
|
|
|
skb_reset_mac_header(skb);
|
|
|
|
/* check if bpf_xdp_adjust_tail was used */
|
|
off = xdp.data_end - orig_data_end;
|
|
if (off != 0)
|
|
__skb_put(skb, off); /* positive on grow, negative on shrink */
|
|
|
|
/* XDP frag metadata (e.g. nr_frags) are updated in eBPF helpers
|
|
* (e.g. bpf_xdp_adjust_tail), we need to update data_len here.
|
|
*/
|
|
if (xdp_buff_has_frags(&xdp))
|
|
skb->data_len = skb_shinfo(skb)->xdp_frags_size;
|
|
else
|
|
skb->data_len = 0;
|
|
|
|
skb->protocol = eth_type_trans(skb, rq->dev);
|
|
|
|
metalen = xdp.data - xdp.data_meta;
|
|
if (metalen)
|
|
skb_metadata_set(skb, metalen);
|
|
out:
|
|
return skb;
|
|
drop:
|
|
stats->rx_drops++;
|
|
xdp_drop:
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
err_xdp:
|
|
rcu_read_unlock();
|
|
xdp_return_buff(&xdp);
|
|
xdp_xmit:
|
|
return NULL;
|
|
}
|
|
|
|
static int veth_xdp_rcv(struct veth_rq *rq, int budget,
|
|
struct veth_xdp_tx_bq *bq,
|
|
struct veth_stats *stats)
|
|
{
|
|
int i, done = 0, n_xdpf = 0;
|
|
void *xdpf[VETH_XDP_BATCH];
|
|
|
|
for (i = 0; i < budget; i++) {
|
|
void *ptr = __ptr_ring_consume(&rq->xdp_ring);
|
|
|
|
if (!ptr)
|
|
break;
|
|
|
|
if (veth_is_xdp_frame(ptr)) {
|
|
/* ndo_xdp_xmit */
|
|
struct xdp_frame *frame = veth_ptr_to_xdp(ptr);
|
|
|
|
stats->xdp_bytes += xdp_get_frame_len(frame);
|
|
frame = veth_xdp_rcv_one(rq, frame, bq, stats);
|
|
if (frame) {
|
|
/* XDP_PASS */
|
|
xdpf[n_xdpf++] = frame;
|
|
if (n_xdpf == VETH_XDP_BATCH) {
|
|
veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf,
|
|
bq, stats);
|
|
n_xdpf = 0;
|
|
}
|
|
}
|
|
} else {
|
|
/* ndo_start_xmit */
|
|
struct sk_buff *skb = ptr;
|
|
|
|
stats->xdp_bytes += skb->len;
|
|
skb = veth_xdp_rcv_skb(rq, skb, bq, stats);
|
|
if (skb) {
|
|
if (skb_shared(skb) || skb_unclone(skb, GFP_ATOMIC))
|
|
netif_receive_skb(skb);
|
|
else
|
|
napi_gro_receive(&rq->xdp_napi, skb);
|
|
}
|
|
}
|
|
done++;
|
|
}
|
|
|
|
if (n_xdpf)
|
|
veth_xdp_rcv_bulk_skb(rq, xdpf, n_xdpf, bq, stats);
|
|
|
|
u64_stats_update_begin(&rq->stats.syncp);
|
|
rq->stats.vs.xdp_redirect += stats->xdp_redirect;
|
|
rq->stats.vs.xdp_bytes += stats->xdp_bytes;
|
|
rq->stats.vs.xdp_drops += stats->xdp_drops;
|
|
rq->stats.vs.rx_drops += stats->rx_drops;
|
|
rq->stats.vs.xdp_packets += done;
|
|
u64_stats_update_end(&rq->stats.syncp);
|
|
|
|
return done;
|
|
}
|
|
|
|
static int veth_poll(struct napi_struct *napi, int budget)
|
|
{
|
|
struct veth_rq *rq =
|
|
container_of(napi, struct veth_rq, xdp_napi);
|
|
struct veth_stats stats = {};
|
|
struct veth_xdp_tx_bq bq;
|
|
int done;
|
|
|
|
bq.count = 0;
|
|
|
|
xdp_set_return_frame_no_direct();
|
|
done = veth_xdp_rcv(rq, budget, &bq, &stats);
|
|
|
|
if (done < budget && napi_complete_done(napi, done)) {
|
|
/* Write rx_notify_masked before reading ptr_ring */
|
|
smp_store_mb(rq->rx_notify_masked, false);
|
|
if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) {
|
|
if (napi_schedule_prep(&rq->xdp_napi)) {
|
|
WRITE_ONCE(rq->rx_notify_masked, true);
|
|
__napi_schedule(&rq->xdp_napi);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (stats.xdp_tx > 0)
|
|
veth_xdp_flush(rq, &bq);
|
|
if (stats.xdp_redirect > 0)
|
|
xdp_do_flush();
|
|
xdp_clear_return_frame_no_direct();
|
|
|
|
return done;
|
|
}
|
|
|
|
static int __veth_napi_enable_range(struct net_device *dev, int start, int end)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err, i;
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL);
|
|
if (err)
|
|
goto err_xdp_ring;
|
|
}
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
napi_enable(&rq->xdp_napi);
|
|
rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_xdp_ring:
|
|
for (i--; i >= start; i--)
|
|
ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __veth_napi_enable(struct net_device *dev)
|
|
{
|
|
return __veth_napi_enable_range(dev, 0, dev->real_num_rx_queues);
|
|
}
|
|
|
|
static void veth_napi_del_range(struct net_device *dev, int start, int end)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int i;
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
rcu_assign_pointer(priv->rq[i].napi, NULL);
|
|
napi_disable(&rq->xdp_napi);
|
|
__netif_napi_del(&rq->xdp_napi);
|
|
}
|
|
synchronize_net();
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
rq->rx_notify_masked = false;
|
|
ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free);
|
|
}
|
|
}
|
|
|
|
static void veth_napi_del(struct net_device *dev)
|
|
{
|
|
veth_napi_del_range(dev, 0, dev->real_num_rx_queues);
|
|
}
|
|
|
|
static bool veth_gro_requested(const struct net_device *dev)
|
|
{
|
|
return !!(dev->wanted_features & NETIF_F_GRO);
|
|
}
|
|
|
|
static int veth_enable_xdp_range(struct net_device *dev, int start, int end,
|
|
bool napi_already_on)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err, i;
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
if (!napi_already_on)
|
|
netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);
|
|
err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i, rq->xdp_napi.napi_id);
|
|
if (err < 0)
|
|
goto err_rxq_reg;
|
|
|
|
err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
|
|
MEM_TYPE_PAGE_SHARED,
|
|
NULL);
|
|
if (err < 0)
|
|
goto err_reg_mem;
|
|
|
|
/* Save original mem info as it can be overwritten */
|
|
rq->xdp_mem = rq->xdp_rxq.mem;
|
|
}
|
|
return 0;
|
|
|
|
err_reg_mem:
|
|
xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq);
|
|
err_rxq_reg:
|
|
for (i--; i >= start; i--) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
xdp_rxq_info_unreg(&rq->xdp_rxq);
|
|
if (!napi_already_on)
|
|
netif_napi_del(&rq->xdp_napi);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void veth_disable_xdp_range(struct net_device *dev, int start, int end,
|
|
bool delete_napi)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int i;
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
rq->xdp_rxq.mem = rq->xdp_mem;
|
|
xdp_rxq_info_unreg(&rq->xdp_rxq);
|
|
|
|
if (delete_napi)
|
|
netif_napi_del(&rq->xdp_napi);
|
|
}
|
|
}
|
|
|
|
static int veth_enable_xdp(struct net_device *dev)
|
|
{
|
|
bool napi_already_on = veth_gro_requested(dev) && (dev->flags & IFF_UP);
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err, i;
|
|
|
|
if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) {
|
|
err = veth_enable_xdp_range(dev, 0, dev->real_num_rx_queues, napi_already_on);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!napi_already_on) {
|
|
err = __veth_napi_enable(dev);
|
|
if (err) {
|
|
veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, true);
|
|
return err;
|
|
}
|
|
|
|
if (!veth_gro_requested(dev)) {
|
|
/* user-space did not require GRO, but adding XDP
|
|
* is supposed to get GRO working
|
|
*/
|
|
dev->features |= NETIF_F_GRO;
|
|
netdev_features_change(dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < dev->real_num_rx_queues; i++) {
|
|
rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog);
|
|
rcu_assign_pointer(priv->rq[i].napi, &priv->rq[i].xdp_napi);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void veth_disable_xdp(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < dev->real_num_rx_queues; i++)
|
|
rcu_assign_pointer(priv->rq[i].xdp_prog, NULL);
|
|
|
|
if (!netif_running(dev) || !veth_gro_requested(dev)) {
|
|
veth_napi_del(dev);
|
|
|
|
/* if user-space did not require GRO, since adding XDP
|
|
* enabled it, clear it now
|
|
*/
|
|
if (!veth_gro_requested(dev) && netif_running(dev)) {
|
|
dev->features &= ~NETIF_F_GRO;
|
|
netdev_features_change(dev);
|
|
}
|
|
}
|
|
|
|
veth_disable_xdp_range(dev, 0, dev->real_num_rx_queues, false);
|
|
}
|
|
|
|
static int veth_napi_enable_range(struct net_device *dev, int start, int end)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err, i;
|
|
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);
|
|
}
|
|
|
|
err = __veth_napi_enable_range(dev, start, end);
|
|
if (err) {
|
|
for (i = start; i < end; i++) {
|
|
struct veth_rq *rq = &priv->rq[i];
|
|
|
|
netif_napi_del(&rq->xdp_napi);
|
|
}
|
|
return err;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int veth_napi_enable(struct net_device *dev)
|
|
{
|
|
return veth_napi_enable_range(dev, 0, dev->real_num_rx_queues);
|
|
}
|
|
|
|
static void veth_disable_range_safe(struct net_device *dev, int start, int end)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
|
|
if (start >= end)
|
|
return;
|
|
|
|
if (priv->_xdp_prog) {
|
|
veth_napi_del_range(dev, start, end);
|
|
veth_disable_xdp_range(dev, start, end, false);
|
|
} else if (veth_gro_requested(dev)) {
|
|
veth_napi_del_range(dev, start, end);
|
|
}
|
|
}
|
|
|
|
static int veth_enable_range_safe(struct net_device *dev, int start, int end)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
if (start >= end)
|
|
return 0;
|
|
|
|
if (priv->_xdp_prog) {
|
|
/* these channels are freshly initialized, napi is not on there even
|
|
* when GRO is requeste
|
|
*/
|
|
err = veth_enable_xdp_range(dev, start, end, false);
|
|
if (err)
|
|
return err;
|
|
|
|
err = __veth_napi_enable_range(dev, start, end);
|
|
if (err) {
|
|
/* on error always delete the newly added napis */
|
|
veth_disable_xdp_range(dev, start, end, true);
|
|
return err;
|
|
}
|
|
} else if (veth_gro_requested(dev)) {
|
|
return veth_napi_enable_range(dev, start, end);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int veth_set_channels(struct net_device *dev,
|
|
struct ethtool_channels *ch)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
unsigned int old_rx_count, new_rx_count;
|
|
struct veth_priv *peer_priv;
|
|
struct net_device *peer;
|
|
int err;
|
|
|
|
/* sanity check. Upper bounds are already enforced by the caller */
|
|
if (!ch->rx_count || !ch->tx_count)
|
|
return -EINVAL;
|
|
|
|
/* avoid braking XDP, if that is enabled */
|
|
peer = rtnl_dereference(priv->peer);
|
|
peer_priv = peer ? netdev_priv(peer) : NULL;
|
|
if (priv->_xdp_prog && peer && ch->rx_count < peer->real_num_tx_queues)
|
|
return -EINVAL;
|
|
|
|
if (peer && peer_priv && peer_priv->_xdp_prog && ch->tx_count > peer->real_num_rx_queues)
|
|
return -EINVAL;
|
|
|
|
old_rx_count = dev->real_num_rx_queues;
|
|
new_rx_count = ch->rx_count;
|
|
if (netif_running(dev)) {
|
|
/* turn device off */
|
|
netif_carrier_off(dev);
|
|
if (peer)
|
|
netif_carrier_off(peer);
|
|
|
|
/* try to allocate new resurces, as needed*/
|
|
err = veth_enable_range_safe(dev, old_rx_count, new_rx_count);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
err = netif_set_real_num_rx_queues(dev, ch->rx_count);
|
|
if (err)
|
|
goto revert;
|
|
|
|
err = netif_set_real_num_tx_queues(dev, ch->tx_count);
|
|
if (err) {
|
|
int err2 = netif_set_real_num_rx_queues(dev, old_rx_count);
|
|
|
|
/* this error condition could happen only if rx and tx change
|
|
* in opposite directions (e.g. tx nr raises, rx nr decreases)
|
|
* and we can't do anything to fully restore the original
|
|
* status
|
|
*/
|
|
if (err2)
|
|
pr_warn("Can't restore rx queues config %d -> %d %d",
|
|
new_rx_count, old_rx_count, err2);
|
|
else
|
|
goto revert;
|
|
}
|
|
|
|
out:
|
|
if (netif_running(dev)) {
|
|
/* note that we need to swap the arguments WRT the enable part
|
|
* to identify the range we have to disable
|
|
*/
|
|
veth_disable_range_safe(dev, new_rx_count, old_rx_count);
|
|
netif_carrier_on(dev);
|
|
if (peer)
|
|
netif_carrier_on(peer);
|
|
}
|
|
return err;
|
|
|
|
revert:
|
|
new_rx_count = old_rx_count;
|
|
old_rx_count = ch->rx_count;
|
|
goto out;
|
|
}
|
|
|
|
static int veth_open(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
int err;
|
|
|
|
if (!peer)
|
|
return -ENOTCONN;
|
|
|
|
if (priv->_xdp_prog) {
|
|
err = veth_enable_xdp(dev);
|
|
if (err)
|
|
return err;
|
|
} else if (veth_gro_requested(dev)) {
|
|
err = veth_napi_enable(dev);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (peer->flags & IFF_UP) {
|
|
netif_carrier_on(dev);
|
|
netif_carrier_on(peer);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int veth_close(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
|
|
netif_carrier_off(dev);
|
|
if (peer)
|
|
netif_carrier_off(peer);
|
|
|
|
if (priv->_xdp_prog)
|
|
veth_disable_xdp(dev);
|
|
else if (veth_gro_requested(dev))
|
|
veth_napi_del(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int is_valid_veth_mtu(int mtu)
|
|
{
|
|
return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
|
|
}
|
|
|
|
static int veth_alloc_queues(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int i;
|
|
|
|
priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL);
|
|
if (!priv->rq)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < dev->num_rx_queues; i++) {
|
|
priv->rq[i].dev = dev;
|
|
u64_stats_init(&priv->rq[i].stats.syncp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void veth_free_queues(struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
|
|
kfree(priv->rq);
|
|
}
|
|
|
|
static int veth_dev_init(struct net_device *dev)
|
|
{
|
|
int err;
|
|
|
|
dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
|
|
if (!dev->lstats)
|
|
return -ENOMEM;
|
|
|
|
err = veth_alloc_queues(dev);
|
|
if (err) {
|
|
free_percpu(dev->lstats);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void veth_dev_free(struct net_device *dev)
|
|
{
|
|
veth_free_queues(dev);
|
|
free_percpu(dev->lstats);
|
|
}
|
|
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
static void veth_poll_controller(struct net_device *dev)
|
|
{
|
|
/* veth only receives frames when its peer sends one
|
|
* Since it has nothing to do with disabling irqs, we are guaranteed
|
|
* never to have pending data when we poll for it so
|
|
* there is nothing to do here.
|
|
*
|
|
* We need this though so netpoll recognizes us as an interface that
|
|
* supports polling, which enables bridge devices in virt setups to
|
|
* still use netconsole
|
|
*/
|
|
}
|
|
#endif /* CONFIG_NET_POLL_CONTROLLER */
|
|
|
|
static int veth_get_iflink(const struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
struct net_device *peer;
|
|
int iflink;
|
|
|
|
rcu_read_lock();
|
|
peer = rcu_dereference(priv->peer);
|
|
iflink = peer ? peer->ifindex : 0;
|
|
rcu_read_unlock();
|
|
|
|
return iflink;
|
|
}
|
|
|
|
static netdev_features_t veth_fix_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
struct net_device *peer;
|
|
|
|
peer = rtnl_dereference(priv->peer);
|
|
if (peer) {
|
|
struct veth_priv *peer_priv = netdev_priv(peer);
|
|
|
|
if (peer_priv->_xdp_prog)
|
|
features &= ~NETIF_F_GSO_SOFTWARE;
|
|
}
|
|
if (priv->_xdp_prog)
|
|
features |= NETIF_F_GRO;
|
|
|
|
return features;
|
|
}
|
|
|
|
static int veth_set_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
netdev_features_t changed = features ^ dev->features;
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
int err;
|
|
|
|
if (!(changed & NETIF_F_GRO) || !(dev->flags & IFF_UP) || priv->_xdp_prog)
|
|
return 0;
|
|
|
|
if (features & NETIF_F_GRO) {
|
|
err = veth_napi_enable(dev);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
veth_napi_del(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
|
|
{
|
|
struct veth_priv *peer_priv, *priv = netdev_priv(dev);
|
|
struct net_device *peer;
|
|
|
|
if (new_hr < 0)
|
|
new_hr = 0;
|
|
|
|
rcu_read_lock();
|
|
peer = rcu_dereference(priv->peer);
|
|
if (unlikely(!peer))
|
|
goto out;
|
|
|
|
peer_priv = netdev_priv(peer);
|
|
priv->requested_headroom = new_hr;
|
|
new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
|
|
dev->needed_headroom = new_hr;
|
|
peer->needed_headroom = new_hr;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
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;
|
|
priv->_xdp_prog = prog;
|
|
peer = rtnl_dereference(priv->peer);
|
|
|
|
if (prog) {
|
|
if (!peer) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached");
|
|
err = -ENOTCONN;
|
|
goto err;
|
|
}
|
|
|
|
max_mtu = SKB_WITH_OVERHEAD(PAGE_SIZE - VETH_XDP_HEADROOM) -
|
|
peer->hard_header_len;
|
|
/* Allow increasing the max_mtu if the program supports
|
|
* XDP fragments.
|
|
*/
|
|
if (prog->aux->xdp_has_frags)
|
|
max_mtu += PAGE_SIZE * MAX_SKB_FRAGS;
|
|
|
|
if (peer->mtu > max_mtu) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP");
|
|
err = -ERANGE;
|
|
goto err;
|
|
}
|
|
|
|
if (dev->real_num_rx_queues < peer->real_num_tx_queues) {
|
|
NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues");
|
|
err = -ENOSPC;
|
|
goto err;
|
|
}
|
|
|
|
if (dev->flags & IFF_UP) {
|
|
err = veth_enable_xdp(dev);
|
|
if (err) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed");
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (!old_prog) {
|
|
peer->hw_features &= ~NETIF_F_GSO_SOFTWARE;
|
|
peer->max_mtu = max_mtu;
|
|
}
|
|
}
|
|
|
|
if (old_prog) {
|
|
if (!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;
|
|
}
|
|
}
|
|
bpf_prog_put(old_prog);
|
|
}
|
|
|
|
if ((!!old_prog ^ !!prog) && peer)
|
|
netdev_update_features(peer);
|
|
|
|
return 0;
|
|
err:
|
|
priv->_xdp_prog = old_prog;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
|
|
{
|
|
switch (xdp->command) {
|
|
case XDP_SETUP_PROG:
|
|
return veth_xdp_set(dev, xdp->prog, xdp->extack);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct net_device_ops veth_netdev_ops = {
|
|
.ndo_init = veth_dev_init,
|
|
.ndo_open = veth_open,
|
|
.ndo_stop = veth_close,
|
|
.ndo_start_xmit = veth_xmit,
|
|
.ndo_get_stats64 = veth_get_stats64,
|
|
.ndo_set_rx_mode = veth_set_multicast_list,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
|
.ndo_poll_controller = veth_poll_controller,
|
|
#endif
|
|
.ndo_get_iflink = veth_get_iflink,
|
|
.ndo_fix_features = veth_fix_features,
|
|
.ndo_set_features = veth_set_features,
|
|
.ndo_features_check = passthru_features_check,
|
|
.ndo_set_rx_headroom = veth_set_rx_headroom,
|
|
.ndo_bpf = veth_xdp,
|
|
.ndo_xdp_xmit = veth_ndo_xdp_xmit,
|
|
.ndo_get_peer_dev = veth_peer_dev,
|
|
};
|
|
|
|
#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
|
|
NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
|
|
NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
|
|
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
|
|
NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
|
|
|
|
static void veth_setup(struct net_device *dev)
|
|
{
|
|
ether_setup(dev);
|
|
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
|
|
dev->priv_flags |= IFF_NO_QUEUE;
|
|
dev->priv_flags |= IFF_PHONY_HEADROOM;
|
|
|
|
dev->netdev_ops = &veth_netdev_ops;
|
|
dev->ethtool_ops = &veth_ethtool_ops;
|
|
dev->features |= NETIF_F_LLTX;
|
|
dev->features |= VETH_FEATURES;
|
|
dev->vlan_features = dev->features &
|
|
~(NETIF_F_HW_VLAN_CTAG_TX |
|
|
NETIF_F_HW_VLAN_STAG_TX |
|
|
NETIF_F_HW_VLAN_CTAG_RX |
|
|
NETIF_F_HW_VLAN_STAG_RX);
|
|
dev->needs_free_netdev = true;
|
|
dev->priv_destructor = veth_dev_free;
|
|
dev->max_mtu = ETH_MAX_MTU;
|
|
|
|
dev->hw_features = VETH_FEATURES;
|
|
dev->hw_enc_features = VETH_FEATURES;
|
|
dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
|
|
}
|
|
|
|
/*
|
|
* netlink interface
|
|
*/
|
|
|
|
static int veth_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
if (tb[IFLA_MTU]) {
|
|
if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct rtnl_link_ops veth_link_ops;
|
|
|
|
static void veth_disable_gro(struct net_device *dev)
|
|
{
|
|
dev->features &= ~NETIF_F_GRO;
|
|
dev->wanted_features &= ~NETIF_F_GRO;
|
|
netdev_update_features(dev);
|
|
}
|
|
|
|
static int veth_init_queues(struct net_device *dev, struct nlattr *tb[])
|
|
{
|
|
int err;
|
|
|
|
if (!tb[IFLA_NUM_TX_QUEUES] && dev->num_tx_queues > 1) {
|
|
err = netif_set_real_num_tx_queues(dev, 1);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (!tb[IFLA_NUM_RX_QUEUES] && dev->num_rx_queues > 1) {
|
|
err = netif_set_real_num_rx_queues(dev, 1);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int veth_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err;
|
|
struct net_device *peer;
|
|
struct veth_priv *priv;
|
|
char ifname[IFNAMSIZ];
|
|
struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
|
|
unsigned char name_assign_type;
|
|
struct ifinfomsg *ifmp;
|
|
struct net *net;
|
|
|
|
/*
|
|
* create and register peer first
|
|
*/
|
|
if (data != NULL && data[VETH_INFO_PEER] != NULL) {
|
|
struct nlattr *nla_peer;
|
|
|
|
nla_peer = data[VETH_INFO_PEER];
|
|
ifmp = nla_data(nla_peer);
|
|
err = rtnl_nla_parse_ifla(peer_tb,
|
|
nla_data(nla_peer) + sizeof(struct ifinfomsg),
|
|
nla_len(nla_peer) - sizeof(struct ifinfomsg),
|
|
NULL);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = veth_validate(peer_tb, NULL, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tbp = peer_tb;
|
|
} else {
|
|
ifmp = NULL;
|
|
tbp = tb;
|
|
}
|
|
|
|
if (ifmp && tbp[IFLA_IFNAME]) {
|
|
nla_strscpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
|
|
name_assign_type = NET_NAME_USER;
|
|
} else {
|
|
snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
|
|
name_assign_type = NET_NAME_ENUM;
|
|
}
|
|
|
|
net = rtnl_link_get_net(src_net, tbp);
|
|
if (IS_ERR(net))
|
|
return PTR_ERR(net);
|
|
|
|
peer = rtnl_create_link(net, ifname, name_assign_type,
|
|
&veth_link_ops, tbp, extack);
|
|
if (IS_ERR(peer)) {
|
|
put_net(net);
|
|
return PTR_ERR(peer);
|
|
}
|
|
|
|
if (!ifmp || !tbp[IFLA_ADDRESS])
|
|
eth_hw_addr_random(peer);
|
|
|
|
if (ifmp && (dev->ifindex != 0))
|
|
peer->ifindex = ifmp->ifi_index;
|
|
|
|
netif_set_gso_max_size(peer, dev->gso_max_size);
|
|
netif_set_gso_max_segs(peer, dev->gso_max_segs);
|
|
|
|
err = register_netdevice(peer);
|
|
put_net(net);
|
|
net = NULL;
|
|
if (err < 0)
|
|
goto err_register_peer;
|
|
|
|
/* keep GRO disabled by default to be consistent with the established
|
|
* veth behavior
|
|
*/
|
|
veth_disable_gro(peer);
|
|
netif_carrier_off(peer);
|
|
|
|
err = rtnl_configure_link(peer, ifmp);
|
|
if (err < 0)
|
|
goto err_configure_peer;
|
|
|
|
/*
|
|
* register dev last
|
|
*
|
|
* note, that since we've registered new device the dev's name
|
|
* should be re-allocated
|
|
*/
|
|
|
|
if (tb[IFLA_ADDRESS] == NULL)
|
|
eth_hw_addr_random(dev);
|
|
|
|
if (tb[IFLA_IFNAME])
|
|
nla_strscpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
|
|
else
|
|
snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
|
|
|
|
err = register_netdevice(dev);
|
|
if (err < 0)
|
|
goto err_register_dev;
|
|
|
|
netif_carrier_off(dev);
|
|
|
|
/*
|
|
* tie the deviced together
|
|
*/
|
|
|
|
priv = netdev_priv(dev);
|
|
rcu_assign_pointer(priv->peer, peer);
|
|
err = veth_init_queues(dev, tb);
|
|
if (err)
|
|
goto err_queues;
|
|
|
|
priv = netdev_priv(peer);
|
|
rcu_assign_pointer(priv->peer, dev);
|
|
err = veth_init_queues(peer, tb);
|
|
if (err)
|
|
goto err_queues;
|
|
|
|
veth_disable_gro(dev);
|
|
return 0;
|
|
|
|
err_queues:
|
|
unregister_netdevice(dev);
|
|
err_register_dev:
|
|
/* nothing to do */
|
|
err_configure_peer:
|
|
unregister_netdevice(peer);
|
|
return err;
|
|
|
|
err_register_peer:
|
|
free_netdev(peer);
|
|
return err;
|
|
}
|
|
|
|
static void veth_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct veth_priv *priv;
|
|
struct net_device *peer;
|
|
|
|
priv = netdev_priv(dev);
|
|
peer = rtnl_dereference(priv->peer);
|
|
|
|
/* Note : dellink() is called from default_device_exit_batch(),
|
|
* before a rcu_synchronize() point. The devices are guaranteed
|
|
* not being freed before one RCU grace period.
|
|
*/
|
|
RCU_INIT_POINTER(priv->peer, NULL);
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
if (peer) {
|
|
priv = netdev_priv(peer);
|
|
RCU_INIT_POINTER(priv->peer, NULL);
|
|
unregister_netdevice_queue(peer, head);
|
|
}
|
|
}
|
|
|
|
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
|
|
[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
|
|
};
|
|
|
|
static struct net *veth_get_link_net(const struct net_device *dev)
|
|
{
|
|
struct veth_priv *priv = netdev_priv(dev);
|
|
struct net_device *peer = rtnl_dereference(priv->peer);
|
|
|
|
return peer ? dev_net(peer) : dev_net(dev);
|
|
}
|
|
|
|
static unsigned int veth_get_num_queues(void)
|
|
{
|
|
/* enforce the same queue limit as rtnl_create_link */
|
|
int queues = num_possible_cpus();
|
|
|
|
if (queues > 4096)
|
|
queues = 4096;
|
|
return queues;
|
|
}
|
|
|
|
static struct rtnl_link_ops veth_link_ops = {
|
|
.kind = DRV_NAME,
|
|
.priv_size = sizeof(struct veth_priv),
|
|
.setup = veth_setup,
|
|
.validate = veth_validate,
|
|
.newlink = veth_newlink,
|
|
.dellink = veth_dellink,
|
|
.policy = veth_policy,
|
|
.maxtype = VETH_INFO_MAX,
|
|
.get_link_net = veth_get_link_net,
|
|
.get_num_tx_queues = veth_get_num_queues,
|
|
.get_num_rx_queues = veth_get_num_queues,
|
|
};
|
|
|
|
/*
|
|
* init/fini
|
|
*/
|
|
|
|
static __init int veth_init(void)
|
|
{
|
|
return rtnl_link_register(&veth_link_ops);
|
|
}
|
|
|
|
static __exit void veth_exit(void)
|
|
{
|
|
rtnl_link_unregister(&veth_link_ops);
|
|
}
|
|
|
|
module_init(veth_init);
|
|
module_exit(veth_exit);
|
|
|
|
MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
|