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| author | Tejun Heo <tj@kernel.org> | 2026-09-14 22:12:34 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-09-15 06:57:20 -1000 |
| commit | a9e3760b0838299649c0d57cca44daaf40ba3c33 (patch) | |
| tree | 95807ff0e511c05602ef34808cfc660303309057 /include/net/netns/can.h | |
| download | linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.tar.gz linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.zip | |
sched_ext: Maintain an online cid mask in the scheduler arenagrafted
Schedulers on the default cid mapping treat [0, nr_online_cids) as the
online set and restart on hotplug. Schedulers that install their own mapping
with scx_bpf_cid_override() have no way to learn which cids are online: the
count no longer identifies members and the CPU-form cpumask is unusable from
cid programs. This is an obvious hole in the cid API.
Add scx_bpf_online_cmask(), a kernel-maintained cmask in the scheduler's
arena, allocated alongside the per-CPU scratch masks and populated after the
cid mapping is finalized and before ops.init(), for child schedulers too.
The pointer stays valid through ops.exit() with no reference to take. It is
the arena offset as a void pointer, the same form struct_ops arena arguments
arrive in. The verifier types the void return as a scalar for the program's
arena cast.
The mask follows the SCX hotplug notifications: seeded from cpu_active_mask
and updated before ops.cid_online/offline() runs, so it lags cpu_online_mask
only inside a hotplug transition. Updates walk the scheduler list under the
lock that also serializes unlinking. Reads are live, not atomic snapshots.
Root initialization excludes hotplug.
v2: Reworded the getter kerneldoc (Andrea Righi).
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Diffstat (limited to 'include/net/netns/can.h')
| -rw-r--r-- | include/net/netns/can.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/net/netns/can.h b/include/net/netns/can.h new file mode 100644 index 000000000..48b79f7e6 --- /dev/null +++ b/include/net/netns/can.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * can in net namespaces + */ + +#ifndef __NETNS_CAN_H__ +#define __NETNS_CAN_H__ + +#include <linux/spinlock.h> +#include <linux/timer.h> + +struct can_dev_rcv_lists; +struct can_pkg_stats; +struct can_rcv_lists_stats; + +struct netns_can { +#if IS_ENABLED(CONFIG_PROC_FS) + struct proc_dir_entry *proc_dir; + struct proc_dir_entry *pde_stats; + struct proc_dir_entry *pde_reset_stats; + struct proc_dir_entry *pde_rcvlist_all; + struct proc_dir_entry *pde_rcvlist_fil; + struct proc_dir_entry *pde_rcvlist_inv; + struct proc_dir_entry *pde_rcvlist_sff; + struct proc_dir_entry *pde_rcvlist_eff; + struct proc_dir_entry *pde_rcvlist_err; + struct proc_dir_entry *bcmproc_dir; +#endif + + /* receive filters subscribed for 'all' CAN devices */ + struct can_dev_rcv_lists *rx_alldev_list; + spinlock_t rcvlists_lock; + struct timer_list stattimer; /* timer for statistics update */ + struct can_pkg_stats *pkg_stats; + struct can_rcv_lists_stats *rcv_lists_stats; + + /* CAN GW per-net gateway jobs */ + struct hlist_head cgw_list; +}; + +#endif /* __NETNS_CAN_H__ */ |