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8aa5a33578
It can be useful for the user to know the reason behind a dropped packet. Introduce new counters which track drops on the receive path caused by: 1. rx ring being full 2. fill ring being empty Also, on the tx path introduce a counter which tracks the number of times we attempt pull from the tx ring when it is empty. Signed-off-by: Ciara Loftus <ciara.loftus@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200708072835.4427-2-ciara.loftus@intel.com
1185 lines
26 KiB
C
1185 lines
26 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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* 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 <linux/rculist.h>
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#include <net/xdp_sock_drv.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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#include "xsk.h"
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#define TX_BATCH_SIZE 16
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static DEFINE_PER_CPU(struct list_head, xskmap_flush_list);
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bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
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{
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return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) &&
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READ_ONCE(xs->umem->fq);
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}
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void xsk_set_rx_need_wakeup(struct xdp_umem *umem)
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{
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if (umem->need_wakeup & XDP_WAKEUP_RX)
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return;
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umem->fq->ring->flags |= XDP_RING_NEED_WAKEUP;
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umem->need_wakeup |= XDP_WAKEUP_RX;
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}
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EXPORT_SYMBOL(xsk_set_rx_need_wakeup);
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void xsk_set_tx_need_wakeup(struct xdp_umem *umem)
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{
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struct xdp_sock *xs;
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if (umem->need_wakeup & XDP_WAKEUP_TX)
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return;
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rcu_read_lock();
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list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) {
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xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP;
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}
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rcu_read_unlock();
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umem->need_wakeup |= XDP_WAKEUP_TX;
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}
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EXPORT_SYMBOL(xsk_set_tx_need_wakeup);
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void xsk_clear_rx_need_wakeup(struct xdp_umem *umem)
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{
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if (!(umem->need_wakeup & XDP_WAKEUP_RX))
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return;
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umem->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP;
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umem->need_wakeup &= ~XDP_WAKEUP_RX;
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}
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EXPORT_SYMBOL(xsk_clear_rx_need_wakeup);
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void xsk_clear_tx_need_wakeup(struct xdp_umem *umem)
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{
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struct xdp_sock *xs;
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if (!(umem->need_wakeup & XDP_WAKEUP_TX))
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return;
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rcu_read_lock();
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list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) {
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xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP;
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}
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rcu_read_unlock();
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umem->need_wakeup &= ~XDP_WAKEUP_TX;
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}
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EXPORT_SYMBOL(xsk_clear_tx_need_wakeup);
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bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem)
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{
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return umem->flags & XDP_UMEM_USES_NEED_WAKEUP;
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}
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EXPORT_SYMBOL(xsk_umem_uses_need_wakeup);
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void xp_release(struct xdp_buff_xsk *xskb)
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{
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xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;
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}
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static u64 xp_get_handle(struct xdp_buff_xsk *xskb)
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{
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u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;
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offset += xskb->pool->headroom;
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if (!xskb->pool->unaligned)
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return xskb->orig_addr + offset;
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return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
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}
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static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
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{
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struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
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u64 addr;
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int err;
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addr = xp_get_handle(xskb);
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err = xskq_prod_reserve_desc(xs->rx, addr, len);
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if (err) {
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xs->rx_queue_full++;
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return err;
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}
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xp_release(xskb);
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return 0;
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}
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static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len)
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{
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void *from_buf, *to_buf;
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u32 metalen;
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if (unlikely(xdp_data_meta_unsupported(from))) {
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from_buf = from->data;
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to_buf = to->data;
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metalen = 0;
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} else {
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from_buf = from->data_meta;
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metalen = from->data - from->data_meta;
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to_buf = to->data - metalen;
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}
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memcpy(to_buf, from_buf, len + metalen);
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}
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static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len,
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bool explicit_free)
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{
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struct xdp_buff *xsk_xdp;
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int err;
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if (len > xsk_umem_get_rx_frame_size(xs->umem)) {
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xs->rx_dropped++;
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return -ENOSPC;
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}
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xsk_xdp = xsk_buff_alloc(xs->umem);
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if (!xsk_xdp) {
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xs->rx_dropped++;
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return -ENOSPC;
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}
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xsk_copy_xdp(xsk_xdp, xdp, len);
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err = __xsk_rcv_zc(xs, xsk_xdp, len);
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if (err) {
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xsk_buff_free(xsk_xdp);
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return err;
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}
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if (explicit_free)
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xdp_return_buff(xdp);
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return 0;
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}
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static bool xsk_is_bound(struct xdp_sock *xs)
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{
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if (READ_ONCE(xs->state) == XSK_BOUND) {
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/* Matches smp_wmb() in bind(). */
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smp_rmb();
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return true;
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}
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return false;
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}
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static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp,
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bool explicit_free)
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{
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u32 len;
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if (!xsk_is_bound(xs))
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return -EINVAL;
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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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len = xdp->data_end - xdp->data;
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return xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL ?
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__xsk_rcv_zc(xs, xdp, len) :
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__xsk_rcv(xs, xdp, len, explicit_free);
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}
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static void xsk_flush(struct xdp_sock *xs)
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{
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xskq_prod_submit(xs->rx);
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__xskq_cons_release(xs->umem->fq);
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sock_def_readable(&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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spin_lock_bh(&xs->rx_lock);
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err = xsk_rcv(xs, xdp, false);
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xsk_flush(xs);
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spin_unlock_bh(&xs->rx_lock);
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return err;
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}
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int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
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{
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struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list);
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int err;
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err = xsk_rcv(xs, xdp, true);
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if (err)
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return err;
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if (!xs->flush_node.prev)
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list_add(&xs->flush_node, flush_list);
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return 0;
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}
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void __xsk_map_flush(void)
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{
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struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list);
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struct xdp_sock *xs, *tmp;
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list_for_each_entry_safe(xs, tmp, flush_list, flush_node) {
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xsk_flush(xs);
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__list_del_clearprev(&xs->flush_node);
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}
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}
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void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
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{
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xskq_prod_submit_n(umem->cq, nb_entries);
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}
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EXPORT_SYMBOL(xsk_umem_complete_tx);
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void xsk_umem_consume_tx_done(struct xdp_umem *umem)
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{
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struct xdp_sock *xs;
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rcu_read_lock();
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list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) {
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__xskq_cons_release(xs->tx);
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xs->sk.sk_write_space(&xs->sk);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(xsk_umem_consume_tx_done);
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bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc)
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{
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struct xdp_sock *xs;
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rcu_read_lock();
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list_for_each_entry_rcu(xs, &umem->xsk_tx_list, list) {
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if (!xskq_cons_peek_desc(xs->tx, desc, umem)) {
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xs->tx->queue_empty_descs++;
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continue;
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}
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/* This is the backpressure mechanism for the Tx path.
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* Reserve space in the completion queue and only proceed
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* if there is space in it. This avoids having to implement
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* any buffering in the Tx path.
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*/
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if (xskq_prod_reserve_addr(umem->cq, desc->addr))
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goto out;
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xskq_cons_release(xs->tx);
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rcu_read_unlock();
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return true;
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}
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out:
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rcu_read_unlock();
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return false;
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}
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EXPORT_SYMBOL(xsk_umem_consume_tx);
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static int xsk_wakeup(struct xdp_sock *xs, u8 flags)
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{
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struct net_device *dev = xs->dev;
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int err;
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rcu_read_lock();
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err = dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags);
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rcu_read_unlock();
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return err;
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}
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static int xsk_zc_xmit(struct xdp_sock *xs)
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{
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return xsk_wakeup(xs, XDP_WAKEUP_TX);
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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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u64 addr = (u64)(long)skb_shinfo(skb)->destructor_arg;
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struct xdp_sock *xs = xdp_sk(skb->sk);
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unsigned long flags;
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spin_lock_irqsave(&xs->tx_completion_lock, flags);
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xskq_prod_submit_addr(xs->umem->cq, addr);
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spin_unlock_irqrestore(&xs->tx_completion_lock, flags);
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sock_wfree(skb);
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}
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static int xsk_generic_xmit(struct sock *sk)
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{
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struct xdp_sock *xs = xdp_sk(sk);
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u32 max_batch = TX_BATCH_SIZE;
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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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mutex_lock(&xs->mutex);
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if (xs->queue_id >= xs->dev->real_num_tx_queues)
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goto out;
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while (xskq_cons_peek_desc(xs->tx, &desc, xs->umem)) {
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char *buffer;
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u64 addr;
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u32 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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len = desc.len;
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skb = sock_alloc_send_skb(sk, len, 1, &err);
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if (unlikely(!skb))
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goto out;
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skb_put(skb, len);
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addr = desc.addr;
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buffer = xsk_buff_raw_get_data(xs->umem, addr);
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err = skb_store_bits(skb, 0, buffer, len);
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/* This is the backpressure mechanism for the Tx path.
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* Reserve space in the completion queue and only proceed
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* if there is space in it. This avoids having to implement
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* any buffering in the Tx path.
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*/
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if (unlikely(err) || xskq_prod_reserve(xs->umem->cq)) {
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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)desc.addr;
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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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xskq_cons_release(xs->tx);
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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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/* SKB completed but not sent */
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err = -EBUSY;
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goto out;
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}
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sent_frame = true;
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}
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xs->tx->queue_empty_descs++;
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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 sock *sk)
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{
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struct xdp_sock *xs = xdp_sk(sk);
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if (unlikely(!(xs->dev->flags & IFF_UP)))
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return -ENETDOWN;
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if (unlikely(!xs->tx))
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return -ENOBUFS;
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return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk);
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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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bool need_wait = !(m->msg_flags & MSG_DONTWAIT);
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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(!xsk_is_bound(xs)))
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return -ENXIO;
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if (unlikely(need_wait))
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return -EOPNOTSUPP;
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return __xsk_sendmsg(sk);
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}
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static __poll_t 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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__poll_t 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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struct xdp_umem *umem;
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if (unlikely(!xsk_is_bound(xs)))
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return mask;
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umem = xs->umem;
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if (umem->need_wakeup) {
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if (xs->zc)
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xsk_wakeup(xs, umem->need_wakeup);
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else
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/* Poll needs to drive Tx also in copy mode */
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__xsk_sendmsg(sk);
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}
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if (xs->rx && !xskq_prod_is_empty(xs->rx))
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mask |= EPOLLIN | EPOLLRDNORM;
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if (xs->tx && !xskq_cons_is_full(xs->tx))
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mask |= EPOLLOUT | EPOLLWRNORM;
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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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|
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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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/* Make sure queue is ready before it can be seen by others */
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smp_wmb();
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WRITE_ONCE(*queue, q);
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return 0;
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}
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static void xsk_unbind_dev(struct xdp_sock *xs)
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{
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struct net_device *dev = xs->dev;
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if (xs->state != XSK_BOUND)
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return;
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WRITE_ONCE(xs->state, XSK_UNBOUND);
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/* Wait for driver to stop using the xdp socket. */
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xdp_del_sk_umem(xs->umem, xs);
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xs->dev = NULL;
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synchronize_net();
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dev_put(dev);
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}
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static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs,
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struct xdp_sock ***map_entry)
|
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{
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struct xsk_map *map = NULL;
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struct xsk_map_node *node;
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|
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*map_entry = NULL;
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|
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spin_lock_bh(&xs->map_list_lock);
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node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node,
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node);
|
|
if (node) {
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WARN_ON(xsk_map_inc(node->map));
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|
map = node->map;
|
|
*map_entry = node->map_entry;
|
|
}
|
|
spin_unlock_bh(&xs->map_list_lock);
|
|
return map;
|
|
}
|
|
|
|
static void xsk_delete_from_maps(struct xdp_sock *xs)
|
|
{
|
|
/* This function removes the current XDP socket from all the
|
|
* maps it resides in. We need to take extra care here, due to
|
|
* the two locks involved. Each map has a lock synchronizing
|
|
* updates to the entries, and each socket has a lock that
|
|
* synchronizes access to the list of maps (map_list). For
|
|
* deadlock avoidance the locks need to be taken in the order
|
|
* "map lock"->"socket map list lock". We start off by
|
|
* accessing the socket map list, and take a reference to the
|
|
* map to guarantee existence between the
|
|
* xsk_get_map_list_entry() and xsk_map_try_sock_delete()
|
|
* calls. Then we ask the map to remove the socket, which
|
|
* tries to remove the socket from the map. Note that there
|
|
* might be updates to the map between
|
|
* xsk_get_map_list_entry() and xsk_map_try_sock_delete().
|
|
*/
|
|
struct xdp_sock **map_entry = NULL;
|
|
struct xsk_map *map;
|
|
|
|
while ((map = xsk_get_map_list_entry(xs, &map_entry))) {
|
|
xsk_map_try_sock_delete(map, xs, map_entry);
|
|
xsk_map_put(map);
|
|
}
|
|
}
|
|
|
|
static int xsk_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
struct net *net;
|
|
|
|
if (!sk)
|
|
return 0;
|
|
|
|
net = sock_net(sk);
|
|
|
|
mutex_lock(&net->xdp.lock);
|
|
sk_del_node_init_rcu(sk);
|
|
mutex_unlock(&net->xdp.lock);
|
|
|
|
local_bh_disable();
|
|
sock_prot_inuse_add(net, sk->sk_prot, -1);
|
|
local_bh_enable();
|
|
|
|
xsk_delete_from_maps(xs);
|
|
mutex_lock(&xs->mutex);
|
|
xsk_unbind_dev(xs);
|
|
mutex_unlock(&xs->mutex);
|
|
|
|
xskq_destroy(xs->rx);
|
|
xskq_destroy(xs->tx);
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
|
|
sk_refcnt_debug_release(sk);
|
|
sock_put(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct socket *xsk_lookup_xsk_from_fd(int fd)
|
|
{
|
|
struct socket *sock;
|
|
int err;
|
|
|
|
sock = sockfd_lookup(fd, &err);
|
|
if (!sock)
|
|
return ERR_PTR(-ENOTSOCK);
|
|
|
|
if (sock->sk->sk_family != PF_XDP) {
|
|
sockfd_put(sock);
|
|
return ERR_PTR(-ENOPROTOOPT);
|
|
}
|
|
|
|
return sock;
|
|
}
|
|
|
|
static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
|
|
{
|
|
struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr;
|
|
struct sock *sk = sock->sk;
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
struct net_device *dev;
|
|
u32 flags, qid;
|
|
int err = 0;
|
|
|
|
if (addr_len < sizeof(struct sockaddr_xdp))
|
|
return -EINVAL;
|
|
if (sxdp->sxdp_family != AF_XDP)
|
|
return -EINVAL;
|
|
|
|
flags = sxdp->sxdp_flags;
|
|
if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY |
|
|
XDP_USE_NEED_WAKEUP))
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->state != XSK_READY) {
|
|
err = -EBUSY;
|
|
goto out_release;
|
|
}
|
|
|
|
dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out_release;
|
|
}
|
|
|
|
if (!xs->rx && !xs->tx) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
qid = sxdp->sxdp_queue_id;
|
|
|
|
if (flags & XDP_SHARED_UMEM) {
|
|
struct xdp_sock *umem_xs;
|
|
struct socket *sock;
|
|
|
|
if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) ||
|
|
(flags & XDP_USE_NEED_WAKEUP)) {
|
|
/* Cannot specify flags for shared sockets. */
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (xs->umem) {
|
|
/* We have already our own. */
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd);
|
|
if (IS_ERR(sock)) {
|
|
err = PTR_ERR(sock);
|
|
goto out_unlock;
|
|
}
|
|
|
|
umem_xs = xdp_sk(sock->sk);
|
|
if (!xsk_is_bound(umem_xs)) {
|
|
err = -EBADF;
|
|
sockfd_put(sock);
|
|
goto out_unlock;
|
|
}
|
|
if (umem_xs->dev != dev || umem_xs->queue_id != qid) {
|
|
err = -EINVAL;
|
|
sockfd_put(sock);
|
|
goto out_unlock;
|
|
}
|
|
|
|
xdp_get_umem(umem_xs->umem);
|
|
WRITE_ONCE(xs->umem, umem_xs->umem);
|
|
sockfd_put(sock);
|
|
} else if (!xs->umem || !xdp_umem_validate_queues(xs->umem)) {
|
|
err = -EINVAL;
|
|
goto out_unlock;
|
|
} else {
|
|
/* This xsk has its own umem. */
|
|
err = xdp_umem_assign_dev(xs->umem, dev, qid, flags);
|
|
if (err)
|
|
goto out_unlock;
|
|
}
|
|
|
|
xs->dev = dev;
|
|
xs->zc = xs->umem->zc;
|
|
xs->queue_id = qid;
|
|
xdp_add_sk_umem(xs->umem, xs);
|
|
|
|
out_unlock:
|
|
if (err) {
|
|
dev_put(dev);
|
|
} else {
|
|
/* Matches smp_rmb() in bind() for shared umem
|
|
* sockets, and xsk_is_bound().
|
|
*/
|
|
smp_wmb();
|
|
WRITE_ONCE(xs->state, XSK_BOUND);
|
|
}
|
|
out_release:
|
|
mutex_unlock(&xs->mutex);
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
struct xdp_umem_reg_v1 {
|
|
__u64 addr; /* Start of packet data area */
|
|
__u64 len; /* Length of packet data area */
|
|
__u32 chunk_size;
|
|
__u32 headroom;
|
|
};
|
|
|
|
static int xsk_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
int err;
|
|
|
|
if (level != SOL_XDP)
|
|
return -ENOPROTOOPT;
|
|
|
|
switch (optname) {
|
|
case XDP_RX_RING:
|
|
case XDP_TX_RING:
|
|
{
|
|
struct xsk_queue **q;
|
|
int entries;
|
|
|
|
if (optlen < sizeof(entries))
|
|
return -EINVAL;
|
|
if (copy_from_user(&entries, optval, sizeof(entries)))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->state != XSK_READY) {
|
|
mutex_unlock(&xs->mutex);
|
|
return -EBUSY;
|
|
}
|
|
q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx;
|
|
err = xsk_init_queue(entries, q, false);
|
|
if (!err && optname == XDP_TX_RING)
|
|
/* Tx needs to be explicitly woken up the first time */
|
|
xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP;
|
|
mutex_unlock(&xs->mutex);
|
|
return err;
|
|
}
|
|
case XDP_UMEM_REG:
|
|
{
|
|
size_t mr_size = sizeof(struct xdp_umem_reg);
|
|
struct xdp_umem_reg mr = {};
|
|
struct xdp_umem *umem;
|
|
|
|
if (optlen < sizeof(struct xdp_umem_reg_v1))
|
|
return -EINVAL;
|
|
else if (optlen < sizeof(mr))
|
|
mr_size = sizeof(struct xdp_umem_reg_v1);
|
|
|
|
if (copy_from_user(&mr, optval, mr_size))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->state != XSK_READY || xs->umem) {
|
|
mutex_unlock(&xs->mutex);
|
|
return -EBUSY;
|
|
}
|
|
|
|
umem = xdp_umem_create(&mr);
|
|
if (IS_ERR(umem)) {
|
|
mutex_unlock(&xs->mutex);
|
|
return PTR_ERR(umem);
|
|
}
|
|
|
|
/* Make sure umem is ready before it can be seen by others */
|
|
smp_wmb();
|
|
WRITE_ONCE(xs->umem, umem);
|
|
mutex_unlock(&xs->mutex);
|
|
return 0;
|
|
}
|
|
case XDP_UMEM_FILL_RING:
|
|
case XDP_UMEM_COMPLETION_RING:
|
|
{
|
|
struct xsk_queue **q;
|
|
int entries;
|
|
|
|
if (copy_from_user(&entries, optval, sizeof(entries)))
|
|
return -EFAULT;
|
|
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->state != XSK_READY) {
|
|
mutex_unlock(&xs->mutex);
|
|
return -EBUSY;
|
|
}
|
|
if (!xs->umem) {
|
|
mutex_unlock(&xs->mutex);
|
|
return -EINVAL;
|
|
}
|
|
|
|
q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq :
|
|
&xs->umem->cq;
|
|
err = xsk_init_queue(entries, q, true);
|
|
if (optname == XDP_UMEM_FILL_RING)
|
|
xp_set_fq(xs->umem->pool, *q);
|
|
mutex_unlock(&xs->mutex);
|
|
return err;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring)
|
|
{
|
|
ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer);
|
|
ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer);
|
|
ring->desc = offsetof(struct xdp_rxtx_ring, desc);
|
|
}
|
|
|
|
static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring)
|
|
{
|
|
ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer);
|
|
ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer);
|
|
ring->desc = offsetof(struct xdp_umem_ring, desc);
|
|
}
|
|
|
|
struct xdp_statistics_v1 {
|
|
__u64 rx_dropped;
|
|
__u64 rx_invalid_descs;
|
|
__u64 tx_invalid_descs;
|
|
};
|
|
|
|
static int xsk_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
int len;
|
|
|
|
if (level != SOL_XDP)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case XDP_STATISTICS:
|
|
{
|
|
struct xdp_statistics stats;
|
|
bool extra_stats = true;
|
|
size_t stats_size;
|
|
|
|
if (len < sizeof(struct xdp_statistics_v1)) {
|
|
return -EINVAL;
|
|
} else if (len < sizeof(stats)) {
|
|
extra_stats = false;
|
|
stats_size = sizeof(struct xdp_statistics_v1);
|
|
} else {
|
|
stats_size = sizeof(stats);
|
|
}
|
|
|
|
mutex_lock(&xs->mutex);
|
|
stats.rx_dropped = xs->rx_dropped;
|
|
if (extra_stats) {
|
|
stats.rx_ring_full = xs->rx_queue_full;
|
|
stats.rx_fill_ring_empty_descs =
|
|
xs->umem ? xskq_nb_queue_empty_descs(xs->umem->fq) : 0;
|
|
stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx);
|
|
} else {
|
|
stats.rx_dropped += xs->rx_queue_full;
|
|
}
|
|
stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx);
|
|
stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx);
|
|
mutex_unlock(&xs->mutex);
|
|
|
|
if (copy_to_user(optval, &stats, stats_size))
|
|
return -EFAULT;
|
|
if (put_user(stats_size, optlen))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
case XDP_MMAP_OFFSETS:
|
|
{
|
|
struct xdp_mmap_offsets off;
|
|
struct xdp_mmap_offsets_v1 off_v1;
|
|
bool flags_supported = true;
|
|
void *to_copy;
|
|
|
|
if (len < sizeof(off_v1))
|
|
return -EINVAL;
|
|
else if (len < sizeof(off))
|
|
flags_supported = false;
|
|
|
|
if (flags_supported) {
|
|
/* xdp_ring_offset is identical to xdp_ring_offset_v1
|
|
* except for the flags field added to the end.
|
|
*/
|
|
xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *)
|
|
&off.rx);
|
|
xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *)
|
|
&off.tx);
|
|
xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *)
|
|
&off.fr);
|
|
xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *)
|
|
&off.cr);
|
|
off.rx.flags = offsetof(struct xdp_rxtx_ring,
|
|
ptrs.flags);
|
|
off.tx.flags = offsetof(struct xdp_rxtx_ring,
|
|
ptrs.flags);
|
|
off.fr.flags = offsetof(struct xdp_umem_ring,
|
|
ptrs.flags);
|
|
off.cr.flags = offsetof(struct xdp_umem_ring,
|
|
ptrs.flags);
|
|
|
|
len = sizeof(off);
|
|
to_copy = &off;
|
|
} else {
|
|
xsk_enter_rxtx_offsets(&off_v1.rx);
|
|
xsk_enter_rxtx_offsets(&off_v1.tx);
|
|
xsk_enter_umem_offsets(&off_v1.fr);
|
|
xsk_enter_umem_offsets(&off_v1.cr);
|
|
|
|
len = sizeof(off_v1);
|
|
to_copy = &off_v1;
|
|
}
|
|
|
|
if (copy_to_user(optval, to_copy, len))
|
|
return -EFAULT;
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
case XDP_OPTIONS:
|
|
{
|
|
struct xdp_options opts = {};
|
|
|
|
if (len < sizeof(opts))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->zc)
|
|
opts.flags |= XDP_OPTIONS_ZEROCOPY;
|
|
mutex_unlock(&xs->mutex);
|
|
|
|
len = sizeof(opts);
|
|
if (copy_to_user(optval, &opts, len))
|
|
return -EFAULT;
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int xsk_mmap(struct file *file, struct socket *sock,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
|
|
unsigned long size = vma->vm_end - vma->vm_start;
|
|
struct xdp_sock *xs = xdp_sk(sock->sk);
|
|
struct xsk_queue *q = NULL;
|
|
struct xdp_umem *umem;
|
|
unsigned long pfn;
|
|
struct page *qpg;
|
|
|
|
if (READ_ONCE(xs->state) != XSK_READY)
|
|
return -EBUSY;
|
|
|
|
if (offset == XDP_PGOFF_RX_RING) {
|
|
q = READ_ONCE(xs->rx);
|
|
} else if (offset == XDP_PGOFF_TX_RING) {
|
|
q = READ_ONCE(xs->tx);
|
|
} else {
|
|
umem = READ_ONCE(xs->umem);
|
|
if (!umem)
|
|
return -EINVAL;
|
|
|
|
/* Matches the smp_wmb() in XDP_UMEM_REG */
|
|
smp_rmb();
|
|
if (offset == XDP_UMEM_PGOFF_FILL_RING)
|
|
q = READ_ONCE(umem->fq);
|
|
else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
|
|
q = READ_ONCE(umem->cq);
|
|
}
|
|
|
|
if (!q)
|
|
return -EINVAL;
|
|
|
|
/* Matches the smp_wmb() in xsk_init_queue */
|
|
smp_rmb();
|
|
qpg = virt_to_head_page(q->ring);
|
|
if (size > page_size(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 int xsk_notifier(struct notifier_block *this,
|
|
unsigned long msg, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
struct sock *sk;
|
|
|
|
switch (msg) {
|
|
case NETDEV_UNREGISTER:
|
|
mutex_lock(&net->xdp.lock);
|
|
sk_for_each(sk, &net->xdp.list) {
|
|
struct xdp_sock *xs = xdp_sk(sk);
|
|
|
|
mutex_lock(&xs->mutex);
|
|
if (xs->dev == dev) {
|
|
sk->sk_err = ENETDOWN;
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_error_report(sk);
|
|
|
|
xsk_unbind_dev(xs);
|
|
|
|
/* Clear device references in umem. */
|
|
xdp_umem_clear_dev(xs->umem);
|
|
}
|
|
mutex_unlock(&xs->mutex);
|
|
}
|
|
mutex_unlock(&net->xdp.lock);
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
sock_set_flag(sk, SOCK_RCU_FREE);
|
|
|
|
xs = xdp_sk(sk);
|
|
xs->state = XSK_READY;
|
|
mutex_init(&xs->mutex);
|
|
spin_lock_init(&xs->rx_lock);
|
|
spin_lock_init(&xs->tx_completion_lock);
|
|
|
|
INIT_LIST_HEAD(&xs->map_list);
|
|
spin_lock_init(&xs->map_list_lock);
|
|
|
|
mutex_lock(&net->xdp.lock);
|
|
sk_add_node_rcu(sk, &net->xdp.list);
|
|
mutex_unlock(&net->xdp.lock);
|
|
|
|
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 struct notifier_block xsk_netdev_notifier = {
|
|
.notifier_call = xsk_notifier,
|
|
};
|
|
|
|
static int __net_init xsk_net_init(struct net *net)
|
|
{
|
|
mutex_init(&net->xdp.lock);
|
|
INIT_HLIST_HEAD(&net->xdp.list);
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit xsk_net_exit(struct net *net)
|
|
{
|
|
WARN_ON_ONCE(!hlist_empty(&net->xdp.list));
|
|
}
|
|
|
|
static struct pernet_operations xsk_net_ops = {
|
|
.init = xsk_net_init,
|
|
.exit = xsk_net_exit,
|
|
};
|
|
|
|
static int __init xsk_init(void)
|
|
{
|
|
int err, cpu;
|
|
|
|
err = proto_register(&xsk_proto, 0 /* no slab */);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = sock_register(&xsk_family_ops);
|
|
if (err)
|
|
goto out_proto;
|
|
|
|
err = register_pernet_subsys(&xsk_net_ops);
|
|
if (err)
|
|
goto out_sk;
|
|
|
|
err = register_netdevice_notifier(&xsk_netdev_notifier);
|
|
if (err)
|
|
goto out_pernet;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
INIT_LIST_HEAD(&per_cpu(xskmap_flush_list, cpu));
|
|
return 0;
|
|
|
|
out_pernet:
|
|
unregister_pernet_subsys(&xsk_net_ops);
|
|
out_sk:
|
|
sock_unregister(PF_XDP);
|
|
out_proto:
|
|
proto_unregister(&xsk_proto);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
fs_initcall(xsk_init);
|