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1eb2cded45
Simon reported that ndo_change_mtu() methods were never
updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted
in commit 501a90c945
("inet: protect against too small
mtu values.")
We read dev->mtu without holding RTNL in many places,
with READ_ONCE() annotations.
It is time to take care of ndo_change_mtu() methods
to use corresponding WRITE_ONCE()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Simon Horman <horms@kernel.org>
Closes: https://lore.kernel.org/netdev/20240505144608.GB67882@kernel.org/
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20240506102812.3025432-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
504 lines
12 KiB
C
504 lines
12 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2012 Intel Corporation. All rights reserved.
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* Copyright (C) 2015 EMC Corporation. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copy
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* PCIe NTB Network Linux driver
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*
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* Contact Information:
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* Jon Mason <jon.mason@intel.com>
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*/
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/ntb.h>
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#include <linux/ntb_transport.h>
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#define NTB_NETDEV_VER "0.7"
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MODULE_DESCRIPTION(KBUILD_MODNAME);
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MODULE_VERSION(NTB_NETDEV_VER);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Intel Corporation");
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/* Time in usecs for tx resource reaper */
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static unsigned int tx_time = 1;
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/* Number of descriptors to free before resuming tx */
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static unsigned int tx_start = 10;
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/* Number of descriptors still available before stop upper layer tx */
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static unsigned int tx_stop = 5;
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struct ntb_netdev {
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struct pci_dev *pdev;
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struct net_device *ndev;
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struct ntb_transport_qp *qp;
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struct timer_list tx_timer;
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};
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#define NTB_TX_TIMEOUT_MS 1000
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#define NTB_RXQ_SIZE 100
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static void ntb_netdev_event_handler(void *data, int link_is_up)
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{
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struct net_device *ndev = data;
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struct ntb_netdev *dev = netdev_priv(ndev);
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netdev_dbg(ndev, "Event %x, Link %x\n", link_is_up,
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ntb_transport_link_query(dev->qp));
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if (link_is_up) {
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if (ntb_transport_link_query(dev->qp))
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netif_carrier_on(ndev);
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} else {
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netif_carrier_off(ndev);
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}
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}
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static void ntb_netdev_rx_handler(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len)
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{
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struct net_device *ndev = qp_data;
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struct sk_buff *skb;
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int rc;
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skb = data;
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if (!skb)
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return;
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netdev_dbg(ndev, "%s: %d byte payload received\n", __func__, len);
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if (len < 0) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_length_errors++;
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goto enqueue_again;
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}
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skb_put(skb, len);
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skb->protocol = eth_type_trans(skb, ndev);
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skb->ip_summed = CHECKSUM_NONE;
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if (__netif_rx(skb) == NET_RX_DROP) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_dropped++;
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} else {
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ndev->stats.rx_packets++;
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ndev->stats.rx_bytes += len;
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}
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skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
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if (!skb) {
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ndev->stats.rx_errors++;
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ndev->stats.rx_frame_errors++;
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return;
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}
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enqueue_again:
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rc = ntb_transport_rx_enqueue(qp, skb, skb->data, ndev->mtu + ETH_HLEN);
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if (rc) {
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dev_kfree_skb_any(skb);
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ndev->stats.rx_errors++;
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ndev->stats.rx_fifo_errors++;
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}
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}
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static int __ntb_netdev_maybe_stop_tx(struct net_device *netdev,
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struct ntb_transport_qp *qp, int size)
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{
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struct ntb_netdev *dev = netdev_priv(netdev);
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netif_stop_queue(netdev);
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/* Make sure to see the latest value of ntb_transport_tx_free_entry()
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* since the queue was last started.
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*/
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smp_mb();
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if (likely(ntb_transport_tx_free_entry(qp) < size)) {
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mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
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return -EBUSY;
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}
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netif_start_queue(netdev);
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return 0;
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}
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static int ntb_netdev_maybe_stop_tx(struct net_device *ndev,
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struct ntb_transport_qp *qp, int size)
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{
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if (netif_queue_stopped(ndev) ||
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(ntb_transport_tx_free_entry(qp) >= size))
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return 0;
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return __ntb_netdev_maybe_stop_tx(ndev, qp, size);
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}
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static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
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void *data, int len)
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{
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struct net_device *ndev = qp_data;
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struct sk_buff *skb;
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struct ntb_netdev *dev = netdev_priv(ndev);
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skb = data;
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if (!skb || !ndev)
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return;
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if (len > 0) {
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ndev->stats.tx_packets++;
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ndev->stats.tx_bytes += skb->len;
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} else {
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ndev->stats.tx_errors++;
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ndev->stats.tx_aborted_errors++;
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}
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dev_kfree_skb_any(skb);
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if (ntb_transport_tx_free_entry(dev->qp) >= tx_start) {
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/* Make sure anybody stopping the queue after this sees the new
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* value of ntb_transport_tx_free_entry()
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*/
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smp_mb();
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if (netif_queue_stopped(ndev))
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netif_wake_queue(ndev);
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}
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}
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static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
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struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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int rc;
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ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
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rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
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if (rc)
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goto err;
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/* check for next submit */
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ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
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return NETDEV_TX_OK;
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err:
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ndev->stats.tx_dropped++;
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ndev->stats.tx_errors++;
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return NETDEV_TX_BUSY;
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}
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static void ntb_netdev_tx_timer(struct timer_list *t)
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{
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struct ntb_netdev *dev = from_timer(dev, t, tx_timer);
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struct net_device *ndev = dev->ndev;
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if (ntb_transport_tx_free_entry(dev->qp) < tx_stop) {
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mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
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} else {
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/* Make sure anybody stopping the queue after this sees the new
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* value of ntb_transport_tx_free_entry()
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*/
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smp_mb();
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if (netif_queue_stopped(ndev))
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netif_wake_queue(ndev);
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}
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}
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static int ntb_netdev_open(struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int rc, i, len;
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/* Add some empty rx bufs */
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for (i = 0; i < NTB_RXQ_SIZE; i++) {
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skb = netdev_alloc_skb(ndev, ndev->mtu + ETH_HLEN);
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if (!skb) {
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rc = -ENOMEM;
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goto err;
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}
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rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
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ndev->mtu + ETH_HLEN);
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if (rc) {
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dev_kfree_skb(skb);
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goto err;
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}
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}
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timer_setup(&dev->tx_timer, ntb_netdev_tx_timer, 0);
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netif_carrier_off(ndev);
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ntb_transport_link_up(dev->qp);
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netif_start_queue(ndev);
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return 0;
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err:
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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return rc;
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}
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static int ntb_netdev_close(struct net_device *ndev)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int len;
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ntb_transport_link_down(dev->qp);
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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del_timer_sync(&dev->tx_timer);
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return 0;
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}
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static int ntb_netdev_change_mtu(struct net_device *ndev, int new_mtu)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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struct sk_buff *skb;
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int len, rc;
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if (new_mtu > ntb_transport_max_size(dev->qp) - ETH_HLEN)
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return -EINVAL;
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if (!netif_running(ndev)) {
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WRITE_ONCE(ndev->mtu, new_mtu);
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return 0;
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}
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/* Bring down the link and dispose of posted rx entries */
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ntb_transport_link_down(dev->qp);
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if (ndev->mtu < new_mtu) {
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int i;
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for (i = 0; (skb = ntb_transport_rx_remove(dev->qp, &len)); i++)
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dev_kfree_skb(skb);
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for (; i; i--) {
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skb = netdev_alloc_skb(ndev, new_mtu + ETH_HLEN);
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if (!skb) {
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rc = -ENOMEM;
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goto err;
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}
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rc = ntb_transport_rx_enqueue(dev->qp, skb, skb->data,
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new_mtu + ETH_HLEN);
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if (rc) {
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dev_kfree_skb(skb);
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goto err;
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}
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}
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}
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WRITE_ONCE(ndev->mtu, new_mtu);
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ntb_transport_link_up(dev->qp);
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return 0;
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err:
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ntb_transport_link_down(dev->qp);
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while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
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dev_kfree_skb(skb);
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netdev_err(ndev, "Error changing MTU, device inoperable\n");
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return rc;
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}
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static const struct net_device_ops ntb_netdev_ops = {
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.ndo_open = ntb_netdev_open,
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.ndo_stop = ntb_netdev_close,
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.ndo_start_xmit = ntb_netdev_start_xmit,
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.ndo_change_mtu = ntb_netdev_change_mtu,
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.ndo_set_mac_address = eth_mac_addr,
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};
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static void ntb_get_drvinfo(struct net_device *ndev,
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struct ethtool_drvinfo *info)
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{
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struct ntb_netdev *dev = netdev_priv(ndev);
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strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
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strscpy(info->version, NTB_NETDEV_VER, sizeof(info->version));
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strscpy(info->bus_info, pci_name(dev->pdev), sizeof(info->bus_info));
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}
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static int ntb_get_link_ksettings(struct net_device *dev,
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struct ethtool_link_ksettings *cmd)
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{
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ethtool_link_ksettings_zero_link_mode(cmd, supported);
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ethtool_link_ksettings_add_link_mode(cmd, supported, Backplane);
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ethtool_link_ksettings_zero_link_mode(cmd, advertising);
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ethtool_link_ksettings_add_link_mode(cmd, advertising, Backplane);
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cmd->base.speed = SPEED_UNKNOWN;
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cmd->base.duplex = DUPLEX_FULL;
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cmd->base.port = PORT_OTHER;
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cmd->base.phy_address = 0;
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cmd->base.autoneg = AUTONEG_ENABLE;
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return 0;
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}
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static const struct ethtool_ops ntb_ethtool_ops = {
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.get_drvinfo = ntb_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_link_ksettings = ntb_get_link_ksettings,
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};
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static const struct ntb_queue_handlers ntb_netdev_handlers = {
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.tx_handler = ntb_netdev_tx_handler,
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.rx_handler = ntb_netdev_rx_handler,
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.event_handler = ntb_netdev_event_handler,
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};
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static int ntb_netdev_probe(struct device *client_dev)
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{
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struct ntb_dev *ntb;
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struct net_device *ndev;
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struct pci_dev *pdev;
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struct ntb_netdev *dev;
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int rc;
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ntb = dev_ntb(client_dev->parent);
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pdev = ntb->pdev;
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if (!pdev)
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return -ENODEV;
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ndev = alloc_etherdev(sizeof(*dev));
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if (!ndev)
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return -ENOMEM;
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SET_NETDEV_DEV(ndev, client_dev);
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dev = netdev_priv(ndev);
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dev->ndev = ndev;
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dev->pdev = pdev;
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ndev->features = NETIF_F_HIGHDMA;
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ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
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ndev->hw_features = ndev->features;
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ndev->watchdog_timeo = msecs_to_jiffies(NTB_TX_TIMEOUT_MS);
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eth_random_addr(ndev->perm_addr);
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dev_addr_set(ndev, ndev->perm_addr);
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ndev->netdev_ops = &ntb_netdev_ops;
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ndev->ethtool_ops = &ntb_ethtool_ops;
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ndev->min_mtu = 0;
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ndev->max_mtu = ETH_MAX_MTU;
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dev->qp = ntb_transport_create_queue(ndev, client_dev,
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&ntb_netdev_handlers);
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if (!dev->qp) {
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rc = -EIO;
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goto err;
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}
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ndev->mtu = ntb_transport_max_size(dev->qp) - ETH_HLEN;
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rc = register_netdev(ndev);
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if (rc)
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goto err1;
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dev_set_drvdata(client_dev, ndev);
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dev_info(&pdev->dev, "%s created\n", ndev->name);
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return 0;
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err1:
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ntb_transport_free_queue(dev->qp);
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err:
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free_netdev(ndev);
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return rc;
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}
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static void ntb_netdev_remove(struct device *client_dev)
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{
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struct net_device *ndev = dev_get_drvdata(client_dev);
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struct ntb_netdev *dev = netdev_priv(ndev);
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unregister_netdev(ndev);
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ntb_transport_free_queue(dev->qp);
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free_netdev(ndev);
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}
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static struct ntb_transport_client ntb_netdev_client = {
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.driver.name = KBUILD_MODNAME,
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.driver.owner = THIS_MODULE,
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.probe = ntb_netdev_probe,
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.remove = ntb_netdev_remove,
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};
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static int __init ntb_netdev_init_module(void)
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{
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int rc;
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rc = ntb_transport_register_client_dev(KBUILD_MODNAME);
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if (rc)
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return rc;
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rc = ntb_transport_register_client(&ntb_netdev_client);
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if (rc) {
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ntb_transport_unregister_client_dev(KBUILD_MODNAME);
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return rc;
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}
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return 0;
|
|
}
|
|
late_initcall(ntb_netdev_init_module);
|
|
|
|
static void __exit ntb_netdev_exit_module(void)
|
|
{
|
|
ntb_transport_unregister_client(&ntb_netdev_client);
|
|
ntb_transport_unregister_client_dev(KBUILD_MODNAME);
|
|
}
|
|
module_exit(ntb_netdev_exit_module);
|