diff options
| author |   Magnus Karlsson <magnus.karlsson@intel.com> | 2018-08-28 14:44:28 +0200 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2018-08-29 12:25:53 -0700 |
| commit | 6c5c9581044dd6e0cd284ab653502fb9264f08b6 (patch) | |
| tree | e6fa178bc5bebdf6a58110ede60352ec5ba50151 /include/linux/netdevice.h | |
| parent | xsk: expose xdp_umem_get_{data,dma} to drivers (diff) | |
| download | linux-dev-6c5c9581044dd6e0cd284ab653502fb9264f08b6.tar.xz linux-dev-6c5c9581044dd6e0cd284ab653502fb9264f08b6.zip | |
net: add napi_if_scheduled_mark_missed
The function napi_if_scheduled_mark_missed is used to check if the
NAPI context is scheduled, if so set NAPIF_STATE_MISSED and return
true. Used by the AF_XDP zero-copy i40e Tx code implementation in
order to make sure that irq affinity is honored by the napi context.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/netdevice.h')
| -rw-r--r-- | include/linux/netdevice.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index ca5ab98053c8..4271f6b4e419 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -535,6 +535,32 @@ static inline void napi_synchronize(const struct napi_struct *n) barrier(); } +/** + * napi_if_scheduled_mark_missed - if napi is running, set the + * NAPIF_STATE_MISSED + * @n: NAPI context + * + * If napi is running, set the NAPIF_STATE_MISSED, and return true if + * NAPI is scheduled. + **/ +static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n) +{ + unsigned long val, new; + + do { + val = READ_ONCE(n->state); + if (val & NAPIF_STATE_DISABLE) + return true; + + if (!(val & NAPIF_STATE_SCHED)) + return false; + + new = val | NAPIF_STATE_MISSED; + } while (cmpxchg(&n->state, val, new) != val); + + return true; +} + enum netdev_queue_state_t { __QUEUE_STATE_DRV_XOFF, __QUEUE_STATE_STACK_XOFF, |