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89 lines
2.3 KiB
Diff
89 lines
2.3 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 8 Feb 2021 11:34:08 -0800
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Subject: [PATCH] net: extract napi poll functionality to __napi_poll()
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This commit introduces a new function __napi_poll() which does the main
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logic of the existing napi_poll() function, and will be called by other
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functions in later commits.
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This idea and implementation is done by Felix Fietkau <nbd@nbd.name> and
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is proposed as part of the patch to move napi work to work_queue
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context.
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This commit by itself is a code restructure.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Signed-off-by: Wei Wang <weiwan@google.com>
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Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -6322,15 +6322,10 @@ void netif_napi_del(struct napi_struct *
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}
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EXPORT_SYMBOL(netif_napi_del);
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-static int napi_poll(struct napi_struct *n, struct list_head *repoll)
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+static int __napi_poll(struct napi_struct *n, bool *repoll)
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{
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- void *have;
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int work, weight;
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- list_del_init(&n->poll_list);
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-
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- have = netpoll_poll_lock(n);
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-
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weight = n->weight;
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/* This NAPI_STATE_SCHED test is for avoiding a race
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@@ -6348,7 +6343,7 @@ static int napi_poll(struct napi_struct
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WARN_ON_ONCE(work > weight);
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if (likely(work < weight))
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- goto out_unlock;
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+ return work;
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/* Drivers must not modify the NAPI state if they
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* consume the entire weight. In such cases this code
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@@ -6357,7 +6352,7 @@ static int napi_poll(struct napi_struct
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*/
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if (unlikely(napi_disable_pending(n))) {
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napi_complete(n);
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- goto out_unlock;
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+ return work;
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}
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if (n->gro_bitmask) {
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@@ -6375,12 +6370,29 @@ static int napi_poll(struct napi_struct
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if (unlikely(!list_empty(&n->poll_list))) {
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pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
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n->dev ? n->dev->name : "backlog");
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- goto out_unlock;
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+ return work;
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}
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- list_add_tail(&n->poll_list, repoll);
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+ *repoll = true;
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+
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+ return work;
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+}
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+
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+static int napi_poll(struct napi_struct *n, struct list_head *repoll)
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+{
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+ bool do_repoll = false;
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+ void *have;
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+ int work;
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+
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+ list_del_init(&n->poll_list);
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+
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+ have = netpoll_poll_lock(n);
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+
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+ work = __napi_poll(n, &do_repoll);
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+
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+ if (do_repoll)
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+ list_add_tail(&n->poll_list, repoll);
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-out_unlock:
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netpoll_poll_unlock(have);
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return work;
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