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![Magnus Karlsson](/assets/img/avatar_default.png)
In this commit, a new getsockopt is added: XDP_STATISTICS. This is used to obtain stats from the sockets. v2: getsockopt now returns size of stats structure. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
656 lines
13 KiB
C
656 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* XDP sockets
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*
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* AF_XDP sockets allows a channel between XDP programs and userspace
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* applications.
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* Author(s): Björn Töpel <bjorn.topel@intel.com>
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* Magnus Karlsson <magnus.karlsson@intel.com>
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*/
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#define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__
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#include <linux/if_xdp.h>
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#include <linux/init.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task.h>
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#include <linux/socket.h>
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#include <linux/file.h>
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#include <linux/uaccess.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <net/xdp_sock.h>
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#include <net/xdp.h>
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#include "xsk_queue.h"
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#include "xdp_umem.h"
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#define TX_BATCH_SIZE 16
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static struct xdp_sock *xdp_sk(struct sock *sk)
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{
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return (struct xdp_sock *)sk;
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}
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bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
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{
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return !!xs->rx;
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}
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static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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u32 *id, len = xdp->data_end - xdp->data;
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void *buffer;
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int err = 0;
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if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
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return -EINVAL;
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id = xskq_peek_id(xs->umem->fq);
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if (!id)
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return -ENOSPC;
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buffer = xdp_umem_get_data_with_headroom(xs->umem, *id);
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memcpy(buffer, xdp->data, len);
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err = xskq_produce_batch_desc(xs->rx, *id, len,
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xs->umem->frame_headroom);
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if (!err)
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xskq_discard_id(xs->umem->fq);
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return err;
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}
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int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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int err;
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err = __xsk_rcv(xs, xdp);
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if (likely(!err))
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xdp_return_buff(xdp);
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else
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xs->rx_dropped++;
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return err;
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}
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void xsk_flush(struct xdp_sock *xs)
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{
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xskq_produce_flush_desc(xs->rx);
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xs->sk.sk_data_ready(&xs->sk);
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}
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int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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int err;
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err = __xsk_rcv(xs, xdp);
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if (!err)
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xsk_flush(xs);
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else
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xs->rx_dropped++;
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return err;
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}
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static void xsk_destruct_skb(struct sk_buff *skb)
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{
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u32 id = (u32)(long)skb_shinfo(skb)->destructor_arg;
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struct xdp_sock *xs = xdp_sk(skb->sk);
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WARN_ON_ONCE(xskq_produce_id(xs->umem->cq, id));
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sock_wfree(skb);
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}
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static int xsk_generic_xmit(struct sock *sk, struct msghdr *m,
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size_t total_len)
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{
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bool need_wait = !(m->msg_flags & MSG_DONTWAIT);
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u32 max_batch = TX_BATCH_SIZE;
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struct xdp_sock *xs = xdp_sk(sk);
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bool sent_frame = false;
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struct xdp_desc desc;
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struct sk_buff *skb;
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int err = 0;
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if (unlikely(!xs->tx))
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return -ENOBUFS;
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if (need_wait)
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return -EOPNOTSUPP;
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mutex_lock(&xs->mutex);
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while (xskq_peek_desc(xs->tx, &desc)) {
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char *buffer;
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u32 id, len;
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if (max_batch-- == 0) {
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err = -EAGAIN;
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goto out;
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}
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if (xskq_reserve_id(xs->umem->cq)) {
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err = -EAGAIN;
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goto out;
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}
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len = desc.len;
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if (unlikely(len > xs->dev->mtu)) {
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err = -EMSGSIZE;
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goto out;
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}
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skb = sock_alloc_send_skb(sk, len, !need_wait, &err);
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if (unlikely(!skb)) {
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err = -EAGAIN;
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goto out;
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}
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skb_put(skb, len);
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id = desc.idx;
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buffer = xdp_umem_get_data(xs->umem, id) + desc.offset;
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err = skb_store_bits(skb, 0, buffer, len);
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if (unlikely(err)) {
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kfree_skb(skb);
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goto out;
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}
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skb->dev = xs->dev;
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skb->priority = sk->sk_priority;
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skb->mark = sk->sk_mark;
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skb_shinfo(skb)->destructor_arg = (void *)(long)id;
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skb->destructor = xsk_destruct_skb;
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err = dev_direct_xmit(skb, xs->queue_id);
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/* Ignore NET_XMIT_CN as packet might have been sent */
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if (err == NET_XMIT_DROP || err == NETDEV_TX_BUSY) {
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err = -EAGAIN;
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/* SKB consumed by dev_direct_xmit() */
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goto out;
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}
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sent_frame = true;
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xskq_discard_desc(xs->tx);
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}
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out:
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if (sent_frame)
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sk->sk_write_space(sk);
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mutex_unlock(&xs->mutex);
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return err;
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}
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static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
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{
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struct sock *sk = sock->sk;
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struct xdp_sock *xs = xdp_sk(sk);
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if (unlikely(!xs->dev))
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return -ENXIO;
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if (unlikely(!(xs->dev->flags & IFF_UP)))
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return -ENETDOWN;
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return xsk_generic_xmit(sk, m, total_len);
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}
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static unsigned int xsk_poll(struct file *file, struct socket *sock,
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struct poll_table_struct *wait)
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{
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unsigned int mask = datagram_poll(file, sock, wait);
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struct sock *sk = sock->sk;
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struct xdp_sock *xs = xdp_sk(sk);
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if (xs->rx && !xskq_empty_desc(xs->rx))
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mask |= POLLIN | POLLRDNORM;
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if (xs->tx && !xskq_full_desc(xs->tx))
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mask |= POLLOUT | POLLWRNORM;
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return mask;
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}
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static int xsk_init_queue(u32 entries, struct xsk_queue **queue,
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bool umem_queue)
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{
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struct xsk_queue *q;
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if (entries == 0 || *queue || !is_power_of_2(entries))
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return -EINVAL;
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q = xskq_create(entries, umem_queue);
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if (!q)
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return -ENOMEM;
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*queue = q;
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return 0;
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}
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static void __xsk_release(struct xdp_sock *xs)
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{
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/* Wait for driver to stop using the xdp socket. */
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synchronize_net();
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dev_put(xs->dev);
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}
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static int xsk_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct xdp_sock *xs = xdp_sk(sk);
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struct net *net;
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if (!sk)
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return 0;
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net = sock_net(sk);
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local_bh_disable();
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sock_prot_inuse_add(net, sk->sk_prot, -1);
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local_bh_enable();
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if (xs->dev) {
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__xsk_release(xs);
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xs->dev = NULL;
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}
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sock_orphan(sk);
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sock->sk = NULL;
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sk_refcnt_debug_release(sk);
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sock_put(sk);
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return 0;
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}
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static struct socket *xsk_lookup_xsk_from_fd(int fd)
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{
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struct socket *sock;
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int err;
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sock = sockfd_lookup(fd, &err);
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if (!sock)
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return ERR_PTR(-ENOTSOCK);
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if (sock->sk->sk_family != PF_XDP) {
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sockfd_put(sock);
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return ERR_PTR(-ENOPROTOOPT);
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}
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return sock;
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}
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static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
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{
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struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr;
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struct sock *sk = sock->sk;
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struct net_device *dev, *dev_curr;
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struct xdp_sock *xs = xdp_sk(sk);
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struct xdp_umem *old_umem = NULL;
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int err = 0;
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if (addr_len < sizeof(struct sockaddr_xdp))
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return -EINVAL;
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if (sxdp->sxdp_family != AF_XDP)
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return -EINVAL;
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mutex_lock(&xs->mutex);
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dev_curr = xs->dev;
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dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex);
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if (!dev) {
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err = -ENODEV;
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goto out_release;
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}
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if (!xs->rx && !xs->tx) {
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err = -EINVAL;
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goto out_unlock;
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}
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if (sxdp->sxdp_queue_id >= dev->num_rx_queues) {
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err = -EINVAL;
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goto out_unlock;
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}
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if (sxdp->sxdp_flags & XDP_SHARED_UMEM) {
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struct xdp_sock *umem_xs;
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struct socket *sock;
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if (xs->umem) {
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/* We have already our own. */
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err = -EINVAL;
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goto out_unlock;
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}
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sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd);
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if (IS_ERR(sock)) {
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err = PTR_ERR(sock);
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goto out_unlock;
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}
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umem_xs = xdp_sk(sock->sk);
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if (!umem_xs->umem) {
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/* No umem to inherit. */
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err = -EBADF;
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sockfd_put(sock);
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goto out_unlock;
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} else if (umem_xs->dev != dev ||
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umem_xs->queue_id != sxdp->sxdp_queue_id) {
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err = -EINVAL;
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sockfd_put(sock);
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goto out_unlock;
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}
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xdp_get_umem(umem_xs->umem);
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old_umem = xs->umem;
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xs->umem = umem_xs->umem;
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sockfd_put(sock);
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} else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) {
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err = -EINVAL;
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goto out_unlock;
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} else {
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/* This xsk has its own umem. */
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xskq_set_umem(xs->umem->fq, &xs->umem->props);
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xskq_set_umem(xs->umem->cq, &xs->umem->props);
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}
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/* Rebind? */
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if (dev_curr && (dev_curr != dev ||
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xs->queue_id != sxdp->sxdp_queue_id)) {
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__xsk_release(xs);
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if (old_umem)
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xdp_put_umem(old_umem);
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}
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xs->dev = dev;
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xs->queue_id = sxdp->sxdp_queue_id;
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xskq_set_umem(xs->rx, &xs->umem->props);
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xskq_set_umem(xs->tx, &xs->umem->props);
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out_unlock:
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if (err)
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dev_put(dev);
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out_release:
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mutex_unlock(&xs->mutex);
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return err;
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}
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static int xsk_setsockopt(struct socket *sock, int level, int optname,
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char __user *optval, unsigned int optlen)
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{
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struct sock *sk = sock->sk;
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struct xdp_sock *xs = xdp_sk(sk);
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int err;
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if (level != SOL_XDP)
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return -ENOPROTOOPT;
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switch (optname) {
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case XDP_RX_RING:
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case XDP_TX_RING:
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{
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struct xsk_queue **q;
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int entries;
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if (optlen < sizeof(entries))
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return -EINVAL;
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if (copy_from_user(&entries, optval, sizeof(entries)))
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return -EFAULT;
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mutex_lock(&xs->mutex);
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q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx;
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err = xsk_init_queue(entries, q, false);
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mutex_unlock(&xs->mutex);
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return err;
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}
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case XDP_UMEM_REG:
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{
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struct xdp_umem_reg mr;
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struct xdp_umem *umem;
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if (xs->umem)
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return -EBUSY;
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if (copy_from_user(&mr, optval, sizeof(mr)))
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return -EFAULT;
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mutex_lock(&xs->mutex);
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err = xdp_umem_create(&umem);
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err = xdp_umem_reg(umem, &mr);
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if (err) {
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kfree(umem);
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mutex_unlock(&xs->mutex);
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return err;
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}
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/* Make sure umem is ready before it can be seen by others */
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smp_wmb();
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xs->umem = umem;
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mutex_unlock(&xs->mutex);
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return 0;
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}
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case XDP_UMEM_FILL_RING:
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case XDP_UMEM_COMPLETION_RING:
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{
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struct xsk_queue **q;
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int entries;
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if (!xs->umem)
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return -EINVAL;
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if (copy_from_user(&entries, optval, sizeof(entries)))
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return -EFAULT;
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mutex_lock(&xs->mutex);
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q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq :
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&xs->umem->cq;
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err = xsk_init_queue(entries, q, true);
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mutex_unlock(&xs->mutex);
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return err;
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}
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default:
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break;
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}
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return -ENOPROTOOPT;
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}
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static int xsk_getsockopt(struct socket *sock, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct sock *sk = sock->sk;
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struct xdp_sock *xs = xdp_sk(sk);
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int len;
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if (level != SOL_XDP)
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return -ENOPROTOOPT;
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if (get_user(len, optlen))
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return -EFAULT;
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if (len < 0)
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return -EINVAL;
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switch (optname) {
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case XDP_STATISTICS:
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{
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struct xdp_statistics stats;
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if (len < sizeof(stats))
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return -EINVAL;
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mutex_lock(&xs->mutex);
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stats.rx_dropped = xs->rx_dropped;
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stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx);
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stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx);
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mutex_unlock(&xs->mutex);
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if (copy_to_user(optval, &stats, sizeof(stats)))
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return -EFAULT;
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if (put_user(sizeof(stats), optlen))
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return -EFAULT;
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return 0;
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}
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default:
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break;
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}
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return -EOPNOTSUPP;
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}
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static int xsk_mmap(struct file *file, struct socket *sock,
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struct vm_area_struct *vma)
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{
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long size = vma->vm_end - vma->vm_start;
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struct xdp_sock *xs = xdp_sk(sock->sk);
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struct xsk_queue *q = NULL;
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unsigned long pfn;
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struct page *qpg;
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if (offset == XDP_PGOFF_RX_RING) {
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q = xs->rx;
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} else if (offset == XDP_PGOFF_TX_RING) {
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q = xs->tx;
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} else {
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if (!xs->umem)
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return -EINVAL;
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if (offset == XDP_UMEM_PGOFF_FILL_RING)
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q = xs->umem->fq;
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else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
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q = xs->umem->cq;
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}
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if (!q)
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return -EINVAL;
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|
|
qpg = virt_to_head_page(q->ring);
|
|
if (size > (PAGE_SIZE << compound_order(qpg)))
|
|
return -EINVAL;
|
|
|
|
pfn = virt_to_phys(q->ring) >> PAGE_SHIFT;
|
|
return remap_pfn_range(vma, vma->vm_start, pfn,
|
|
size, vma->vm_page_prot);
|
|
}
|
|
|
|
static struct proto xsk_proto = {
|
|
.name = "XDP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct xdp_sock),
|
|
};
|
|
|
|
static const struct proto_ops xsk_proto_ops = {
|
|
.family = PF_XDP,
|
|
.owner = THIS_MODULE,
|
|
.release = xsk_release,
|
|
.bind = xsk_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = sock_no_getname,
|
|
.poll = xsk_poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = xsk_setsockopt,
|
|
.getsockopt = xsk_getsockopt,
|
|
.sendmsg = xsk_sendmsg,
|
|
.recvmsg = sock_no_recvmsg,
|
|
.mmap = xsk_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static void xsk_destruct(struct sock *sk)
|
|
{
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
return;
|
|
|
|
xskq_destroy(xs->rx);
|
|
xskq_destroy(xs->tx);
|
|
xdp_put_umem(xs->umem);
|
|
|
|
sk_refcnt_debug_dec(sk);
|
|
}
|
|
|
|
static int xsk_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct xdp_sock *xs;
|
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_RAW))
|
|
return -EPERM;
|
|
if (sock->type != SOCK_RAW)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
if (protocol)
|
|
return -EPROTONOSUPPORT;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern);
|
|
if (!sk)
|
|
return -ENOBUFS;
|
|
|
|
sock->ops = &xsk_proto_ops;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sk->sk_family = PF_XDP;
|
|
|
|
sk->sk_destruct = xsk_destruct;
|
|
sk_refcnt_debug_inc(sk);
|
|
|
|
xs = xdp_sk(sk);
|
|
mutex_init(&xs->mutex);
|
|
|
|
local_bh_disable();
|
|
sock_prot_inuse_add(net, &xsk_proto, 1);
|
|
local_bh_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_proto_family xsk_family_ops = {
|
|
.family = PF_XDP,
|
|
.create = xsk_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init xsk_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = proto_register(&xsk_proto, 0 /* no slab */);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = sock_register(&xsk_family_ops);
|
|
if (err)
|
|
goto out_proto;
|
|
|
|
return 0;
|
|
|
|
out_proto:
|
|
proto_unregister(&xsk_proto);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
fs_initcall(xsk_init);
|