diff options
author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2017-12-01 15:08:58 -0800 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2017-12-03 00:27:57 +0100 |
commit | 83c9e13aa39aed5cf9a2f8dd69770b7c35ba1281 (patch) | |
tree | 215f9edf3f07ed1a784998150dda011819a71184 /drivers/net/netdevsim | |
parent | bd0b2e7fe611953470ec7c533b455fb2abd382cd (diff) | |
download | linux-83c9e13aa39aed5cf9a2f8dd69770b7c35ba1281.tar.bz2 |
netdevsim: add software driver for testing offloads
To be able to run selftests without any hardware required we
need a software model. The model can also serve as an example
implementation for those implementing actual HW offloads.
The dummy driver have previously been extended to test SR-IOV,
but the general consensus seems to be against adding further
features to it.
Add a new driver for purposes of software modelling only.
eBPF and SR-IOV will be added here shortly, others are invited
to further extend the driver with their offload models.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/netdevsim')
-rw-r--r-- | drivers/net/netdevsim/Makefile | 6 | ||||
-rw-r--r-- | drivers/net/netdevsim/netdev.c | 118 | ||||
-rw-r--r-- | drivers/net/netdevsim/netdevsim.h | 26 |
3 files changed, 150 insertions, 0 deletions
diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile new file mode 100644 index 000000000000..07867bfe873b --- /dev/null +++ b/drivers/net/netdevsim/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_NETDEVSIM) += netdevsim.o + +netdevsim-objs := \ + netdev.o \ diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c new file mode 100644 index 000000000000..7599c72c477a --- /dev/null +++ b/drivers/net/netdevsim/netdev.c @@ -0,0 +1,118 @@ +/* + * Copyright (C) 2017 Netronome Systems, Inc. + * + * This software is licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree. + * + * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" + * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE + * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME + * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + */ + +#include <linux/etherdevice.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <net/netlink.h> +#include <net/rtnetlink.h> + +#include "netdevsim.h" + +static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + + u64_stats_update_begin(&ns->syncp); + ns->tx_packets++; + ns->tx_bytes += skb->len; + u64_stats_update_end(&ns->syncp); + + dev_kfree_skb(skb); + + return NETDEV_TX_OK; +} + +static void nsim_set_rx_mode(struct net_device *dev) +{ +} + +static void +nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + struct netdevsim *ns = netdev_priv(dev); + unsigned int start; + + do { + start = u64_stats_fetch_begin(&ns->syncp); + stats->tx_bytes = ns->tx_bytes; + stats->tx_packets = ns->tx_packets; + } while (u64_stats_fetch_retry(&ns->syncp, start)); +} + +static const struct net_device_ops nsim_netdev_ops = { + .ndo_start_xmit = nsim_start_xmit, + .ndo_set_rx_mode = nsim_set_rx_mode, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, + .ndo_get_stats64 = nsim_get_stats64, +}; + +static void nsim_setup(struct net_device *dev) +{ + ether_setup(dev); + eth_hw_addr_random(dev); + + dev->netdev_ops = &nsim_netdev_ops; + dev->needs_free_netdev = true; + + dev->tx_queue_len = 0; + dev->flags |= IFF_NOARP; + dev->flags &= ~IFF_MULTICAST; + dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | + IFF_NO_QUEUE; + dev->features |= NETIF_F_HIGHDMA | + NETIF_F_SG | + NETIF_F_FRAGLIST | + NETIF_F_HW_CSUM | + NETIF_F_TSO; + dev->max_mtu = ETH_MAX_MTU; +} + +static int nsim_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + if (tb[IFLA_ADDRESS]) { + if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) + return -EINVAL; + if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) + return -EADDRNOTAVAIL; + } + return 0; +} + +static struct rtnl_link_ops nsim_link_ops __read_mostly = { + .kind = DRV_NAME, + .priv_size = sizeof(struct netdevsim), + .setup = nsim_setup, + .validate = nsim_validate, +}; + +static int __init nsim_module_init(void) +{ + return rtnl_link_register(&nsim_link_ops); +} + +static void __exit nsim_module_exit(void) +{ + rtnl_link_unregister(&nsim_link_ops); +} + +module_init(nsim_module_init); +module_exit(nsim_module_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_RTNL_LINK(DRV_NAME); diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h new file mode 100644 index 000000000000..4558c6f11598 --- /dev/null +++ b/drivers/net/netdevsim/netdevsim.h @@ -0,0 +1,26 @@ +/* + * Copyright (C) 2017 Netronome Systems, Inc. + * + * This software is licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree. + * + * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" + * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE + * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME + * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + */ + +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/u64_stats_sync.h> + +#define DRV_NAME "netdevsim" + +struct netdevsim { + u64 tx_packets; + u64 tx_bytes; + struct u64_stats_sync syncp; +}; |