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bpf: offload: keep the offload state per-ASIC 

Create a higher-level entity to represent a device/ASIC to allow
programs and maps to be shared between device ports.  The extra
work is required to make sure we don't destroy BPF objects as
soon as the netdev for which they were loaded gets destroyed,
as other ports may still be using them.  When netdev goes away
all of its BPF objects will be moved to other netdevs of the
device, and only destroyed when last netdev is unregistered.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-07-17 10:53:25 -07:00 committed by Daniel Borkmann
parent 9fd7c55591
commit 602144c224
6 changed files with 103 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/ethernet/netronome/nfp/bpf/main.c
View File

@ -406,12 +406,16 @@ err_release_free:
static int nfp_bpf_ndo_init(struct nfp_app *app, struct net_device *netdev)
{
return bpf_offload_dev_netdev_register(netdev);
struct nfp_app_bpf *bpf = app->priv;
return bpf_offload_dev_netdev_register(bpf->bpf_dev, netdev);
}
static void nfp_bpf_ndo_uninit(struct nfp_app *app, struct net_device *netdev)
{
bpf_offload_dev_netdev_unregister(netdev);
struct nfp_app_bpf *bpf = app->priv;
bpf_offload_dev_netdev_unregister(bpf->bpf_dev, netdev);
}
static int nfp_bpf_init(struct nfp_app *app)
@ -437,6 +441,11 @@ static int nfp_bpf_init(struct nfp_app *app)
if (err)
goto err_free_neutral_maps;
bpf->bpf_dev = bpf_offload_dev_create();
err = PTR_ERR_OR_ZERO(bpf->bpf_dev);
if (err)
goto err_free_neutral_maps;
return 0;
err_free_neutral_maps:
@ -455,6 +464,7 @@ static void nfp_bpf_clean(struct nfp_app *app)
{
struct nfp_app_bpf *bpf = app->priv;
bpf_offload_dev_destroy(bpf->bpf_dev);
WARN_ON(!skb_queue_empty(&bpf->cmsg_replies));
WARN_ON(!list_empty(&bpf->map_list));
WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);

4
drivers/net/ethernet/netronome/nfp/bpf/main.h
View File

@ -110,6 +110,8 @@ enum pkt_vec {
* struct nfp_app_bpf - bpf app priv structure
* @app: backpointer to the app
*
* @bpf_dev: BPF offload device handle
*
* @tag_allocator: bitmap of control message tags in use
* @tag_alloc_next: next tag bit to allocate
* @tag_alloc_last: next tag bit to be freed
@ -150,6 +152,8 @@ enum pkt_vec {
struct nfp_app_bpf {
struct nfp_app *app;
struct bpf_offload_dev *bpf_dev;
DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
u16 tag_alloc_next;
u16 tag_alloc_last;

17
drivers/net/netdevsim/bpf.c
View File

@ -592,11 +592,16 @@ int nsim_bpf_init(struct netdevsim *ns)
debugfs_create_dir("bpf_bound_progs", ns->sdev->ddir);
if (IS_ERR_OR_NULL(ns->sdev->ddir_bpf_bound_progs))
return -ENOMEM;
ns->sdev->bpf_dev = bpf_offload_dev_create();
err = PTR_ERR_OR_ZERO(ns->sdev->bpf_dev);
if (err)
return err;
}
err = bpf_offload_dev_netdev_register(ns->netdev);
err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
if (err)
return err;
goto err_destroy_bdev;
debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
&ns->bpf_offloaded_id);
@ -624,6 +629,11 @@ int nsim_bpf_init(struct netdevsim *ns)
&ns->bpf_map_accept);
return 0;
err_destroy_bdev:
if (ns->sdev->refcnt == 1)
bpf_offload_dev_destroy(ns->sdev->bpf_dev);
return err;
}
void nsim_bpf_uninit(struct netdevsim *ns)
@ -631,10 +641,11 @@ void nsim_bpf_uninit(struct netdevsim *ns)
WARN_ON(ns->xdp.prog);
WARN_ON(ns->xdp_hw.prog);
WARN_ON(ns->bpf_offloaded);
bpf_offload_dev_netdev_unregister(ns->netdev);
bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
if (ns->sdev->refcnt == 1) {
WARN_ON(!list_empty(&ns->sdev->bpf_bound_progs));
WARN_ON(!list_empty(&ns->sdev->bpf_bound_maps));
bpf_offload_dev_destroy(ns->sdev->bpf_dev);
}
}

3
drivers/net/netdevsim/netdevsim.h
View File

@ -27,6 +27,7 @@
#define NSIM_EA(extack, msg) NL_SET_ERR_MSG_MOD((extack), msg)
struct bpf_prog;
struct bpf_offload_dev;
struct dentry;
struct nsim_vf_config;
@ -36,6 +37,8 @@ struct netdevsim_shared_dev {
struct dentry *ddir;
struct bpf_offload_dev *bpf_dev;
struct dentry *ddir_bpf_bound_progs;
u32 prog_id_gen;

9
include/linux/bpf.h
View File

@ -85,6 +85,7 @@ struct bpf_map {
char name[BPF_OBJ_NAME_LEN];
};
struct bpf_offload_dev;
struct bpf_offloaded_map;
struct bpf_map_dev_ops {
@ -650,8 +651,12 @@ int bpf_map_offload_get_next_key(struct bpf_map *map,
bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
int bpf_offload_dev_netdev_register(struct net_device *netdev);
void bpf_offload_dev_netdev_unregister(struct net_device *netdev);
struct bpf_offload_dev *bpf_offload_dev_create(void);
void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
struct net_device *netdev);
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
struct net_device *netdev);
#if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr);

79
kernel/bpf/offload.c
View File

@ -32,11 +32,17 @@
*/
static DECLARE_RWSEM(bpf_devs_lock);
struct bpf_offload_dev {
struct list_head netdevs;
};
struct bpf_offload_netdev {
struct rhash_head l;
struct net_device *netdev;
struct bpf_offload_dev *offdev;
struct list_head progs;
struct list_head maps;
struct list_head offdev_netdevs;
};
static const struct rhashtable_params offdevs_params = {
@ -526,25 +532,18 @@ bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map)
return ret;
}
int bpf_offload_dev_netdev_register(struct net_device *netdev)
int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
struct net_device *netdev)
{
struct bpf_offload_netdev *ondev;
int err;
down_write(&bpf_devs_lock);
if (!offdevs_inited) {
err = rhashtable_init(&offdevs, &offdevs_params);
if (err)
return err;
offdevs_inited = true;
}
up_write(&bpf_devs_lock);
ondev = kzalloc(sizeof(*ondev), GFP_KERNEL);
if (!ondev)
return -ENOMEM;
ondev->netdev = netdev;
ondev->offdev = offdev;
INIT_LIST_HEAD(&ondev->progs);
INIT_LIST_HEAD(&ondev->maps);
@ -555,6 +554,7 @@ int bpf_offload_dev_netdev_register(struct net_device *netdev)
goto err_unlock_free;
}
list_add(&ondev->offdev_netdevs, &offdev->netdevs);
up_write(&bpf_devs_lock);
return 0;
@ -565,11 +565,12 @@ err_unlock_free:
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_register);
void bpf_offload_dev_netdev_unregister(struct net_device *netdev)
void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
struct net_device *netdev)
{
struct bpf_offload_netdev *ondev, *altdev;
struct bpf_offloaded_map *offmap, *mtmp;
struct bpf_prog_offload *offload, *ptmp;
struct bpf_offload_netdev *ondev;
ASSERT_RTNL();
@ -579,11 +580,26 @@ void bpf_offload_dev_netdev_unregister(struct net_device *netdev)
goto unlock;
WARN_ON(rhashtable_remove_fast(&offdevs, &ondev->l, offdevs_params));
list_del(&ondev->offdev_netdevs);
list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
__bpf_prog_offload_destroy(offload->prog);
list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
__bpf_map_offload_destroy(offmap);
/* Try to move the objects to another netdev of the device */
altdev = list_first_entry_or_null(&offdev->netdevs,
struct bpf_offload_netdev,
offdev_netdevs);
if (altdev) {
list_for_each_entry(offload, &ondev->progs, offloads)
offload->netdev = altdev->netdev;
list_splice_init(&ondev->progs, &altdev->progs);
list_for_each_entry(offmap, &ondev->maps, offloads)
offmap->netdev = altdev->netdev;
list_splice_init(&ondev->maps, &altdev->maps);
} else {
list_for_each_entry_safe(offload, ptmp, &ondev->progs, offloads)
__bpf_prog_offload_destroy(offload->prog);
list_for_each_entry_safe(offmap, mtmp, &ondev->maps, offloads)
__bpf_map_offload_destroy(offmap);
}
WARN_ON(!list_empty(&ondev->progs));
WARN_ON(!list_empty(&ondev->maps));
@ -592,3 +608,34 @@ unlock:
up_write(&bpf_devs_lock);
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_netdev_unregister);
struct bpf_offload_dev *bpf_offload_dev_create(void)
{
struct bpf_offload_dev *offdev;
int err;
down_write(&bpf_devs_lock);
if (!offdevs_inited) {
err = rhashtable_init(&offdevs, &offdevs_params);
if (err)
return ERR_PTR(err);
offdevs_inited = true;
}
up_write(&bpf_devs_lock);
offdev = kzalloc(sizeof(*offdev), GFP_KERNEL);
if (!offdev)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&offdev->netdevs);
return offdev;
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_create);
void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev)
{
WARN_ON(!list_empty(&offdev->netdevs));
kfree(offdev);
}
EXPORT_SYMBOL_GPL(bpf_offload_dev_destroy);