[PATCH net-next v3 4/5] net: modify kthread handler to use __napi_poll()
From: Wei Wang <hidden>
Date: 2020-11-18 20:07:42
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Jakub Kicinski <kuba@kernel.org> The current kthread handler calls napi_poll() and has to pass a dummy repoll list to the function, which seems redundent. The new proposed kthread handler calls the newly proposed __napi_poll(), and respects napi->weight as before. If repoll is needed, cond_resched() is called first to give other tasks a chance to run before repolling. This change is proposed by Jakub Kicinski [off-list ref] on top of the previous patch. Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Wei Wang <redacted> Reviewed-by: Eric Dumazet <edumazet@google.com> --- net/core/dev.c | 62 +++++++++++++++++++------------------------------- 1 file changed, 24 insertions(+), 38 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index a739dbbe4d89..88437cdf29f1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -6840,6 +6840,15 @@ static int __napi_poll(struct napi_struct *n, bool *repoll) gro_normal_list(n); + /* Some drivers may have called napi_schedule + * prior to exhausting their budget. + */ + if (unlikely(!list_empty(&n->poll_list))) { + pr_warn_once("%s: Budget exhausted after napi rescheduled\n", + n->dev ? n->dev->name : "backlog"); + return work; + } + *repoll = true; return work;
@@ -6860,15 +6869,6 @@ static int napi_poll(struct napi_struct *n, struct list_head *repoll) if (!do_repoll) goto out_unlock; - /* Some drivers may have called napi_schedule - * prior to exhausting their budget. - */ - if (unlikely(!list_empty(&n->poll_list))) { - pr_warn_once("%s: Budget exhausted after napi rescheduled\n", - n->dev ? n->dev->name : "backlog"); - goto out_unlock; - } - list_add_tail(&n->poll_list, repoll); out_unlock:
@@ -6897,40 +6897,26 @@ static int napi_thread_wait(struct napi_struct *napi) static int napi_threaded_poll(void *data) { struct napi_struct *napi = data; + void *have; while (!napi_thread_wait(napi)) { - struct list_head dummy_repoll; - int budget = netdev_budget; - unsigned long time_limit; - bool again = true; + for (;;) { + bool repoll = false; - INIT_LIST_HEAD(&dummy_repoll); - local_bh_disable(); - time_limit = jiffies + 2; - do { - /* ensure that the poll list is not empty */ - if (list_empty(&dummy_repoll)) - list_add(&napi->poll_list, &dummy_repoll); - - budget -= napi_poll(napi, &dummy_repoll); - if (unlikely(budget <= 0 || - time_after_eq(jiffies, time_limit))) { - cond_resched(); - - /* refresh the budget */ - budget = netdev_budget; - __kfree_skb_flush(); - time_limit = jiffies + 2; - } + local_bh_disable(); - if (napi_disable_pending(napi)) - again = false; - else if (!test_bit(NAPI_STATE_SCHED, &napi->state)) - again = false; - } while (again); + have = netpoll_poll_lock(napi); + __napi_poll(napi, &repoll); + netpoll_poll_unlock(have); - __kfree_skb_flush(); - local_bh_enable(); + __kfree_skb_flush(); + local_bh_enable(); + + if (!repoll) + break; + + cond_resched(); + } } return 0; }
--
2.29.2.454.gaff20da3a2-goog