{"id":52160,"date":"2024-12-03T08:34:57","date_gmt":"2024-12-03T00:34:57","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52160\/"},"modified":"2024-12-03T08:34:57","modified_gmt":"2024-12-03T00:34:57","slug":"linux-linkwatch%e8%bf%9b%e7%a8%8b%e6%8c%87%e7%9a%84%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52160\/","title":{"rendered":"linux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>linux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48<\/h1>\n<p>\u600e\u4e48\u5165\u95e8\u6587\u7ae0\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u7c73\u4e91\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300alinux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n<\/p>\n<blockquote>\n<p>linux linkwatch\u662f\u201c\u94fe\u63a5\u72b6\u6001\u6539\u53d8\u201d\u8fdb\u7a0b\uff1b\u5728linux \u7f51\u7edc\u534f\u8bae\u6808\u4e2d\uff0clinkwatch\u6a21\u5757\u7528\u6765\u901a\u77e5\u7f51\u5361\u5f53\u524d\u662f\u5426\u80fd\u591f\u8fdb\u884c\u6570\u636e\u4f20\u8f93\uff1b\u5728\u9a71\u52a8\u4e2d\u8c03\u7528\u201cnetif_carrier_on\/netif_carrier_off\u201d\u51fd\u6570\u6765\u901a\u77e5\u7f51\u7edc\u72b6\u6001\u53d8\u5316\u3002<\/p>\n<\/blockquote>\n<p><strong>\u94fe\u63a5\u72b6\u6001\u6539\u53d8(linkwatch)<\/strong><\/p>\n<p>\u5728Linux\u7f51\u7edc\u534f\u8bae\u6808\u4e2dlinkwatch\u6a21\u5757\u7528\u6765\u901a\u77e5\u7f51\u5361\u5f53\u524d\u662f\u5426\u80fd\u591f\u8fdb\u884c\u6570\u636e\u4f20\u8f93.<\/p>\n<p>\u9a71\u52a8\u4e2d\u8c03\u7528netif_carrier_on\/netif_carrier_off\u51fd\u6570\u6765\u901a\u77e5\u7f51\u7edc\u72b6\u6001\u53d8\u5316.<\/p>\n<p><strong>\u4e3b\u8981\u4f5c\u7528:<\/strong><\/p>\n<ul>\n<li>\n<p>\u542f\u52a8\/\u7981\u6b62 TX\u961f\u5217\u7684\u6d41\u91cf\u63a7\u5236\u529f\u80fd<\/p>\n<\/li>\n<li>\n<p>\u53d1\u8d77netlink\u6d88\u606fNETDEV_CHANGE\u5230\u7528\u6237\u7a7a\u95f4<\/p>\n<\/li>\n<\/ul>\n<pre>void&nbsp;netif_carrier_on(struct&nbsp;net_device&nbsp;*dev)\n{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(test_and_clear_bit(__LINK_STATE_NOCARRIER,&nbsp;&amp;dev-&gt;state))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(dev-&gt;reg_state&nbsp;==&nbsp;NETREG_UNINITIALIZED)\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_fire_event(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(netif_running(dev))\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;__netdev_watchdog_up(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n}\nvoid&nbsp;netif_carrier_off(struct&nbsp;net_device&nbsp;*dev)\n{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!test_and_set_bit(__LINK_STATE_NOCARRIER,&nbsp;&amp;dev-&gt;state))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(dev-&gt;reg_state&nbsp;==&nbsp;NETREG_UNINITIALIZED)\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_fire_event(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n}\nlinwatch\u6a21\u5757\uff0c\u53ea\u9700\u8981\u77e5\u9053\u72b6\u6001\u6539\u53d8\u4e86\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u5177\u4f53\u662fon\u8fd8\u662foff\nvoid&nbsp;linkwatch_fire_event(struct&nbsp;net_device&nbsp;*dev)\n{\n&nbsp;&nbsp;&nbsp;\/*\u5224\u65ad\u662f\u5426\u4e3a\u7d27\u6025\u4e8b\u4ef6,&nbsp;\u5185\u6838\u89c4\u5b9a\u4e24\u6b21\u4e8b\u4ef6\u7684\u95f4\u9694\u81f3\u5c11\u4e3a1\u4e2aHZ*\/\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bool&nbsp;urgent&nbsp;=&nbsp;linkwatch_urgent_event(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!test_and_set_bit(__LINK_STATE_LINKWATCH_PENDING,&nbsp;&amp;dev-&gt;state))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_add_event(dev);\/\/\u628adev\u6dfb\u52a0\u5230lweventlist\u94fe\u8868\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;else&nbsp;if&nbsp;(!urgent)\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return;\n&nbsp;&nbsp;&nbsp;\/*\u8c03\u7528\u5de5\u4f5c\u961f\u5217linkwatch_event&nbsp;*\/\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_schedule_work(urgent);\n}\n&nbsp;\nstatic&nbsp;void&nbsp;__linkwatch_run_queue(int&nbsp;urgent_only)\n{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;struct&nbsp;net_device&nbsp;*dev;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LIST_HEAD(wrk);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while&nbsp;(!list_empty(&amp;wrk))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev&nbsp;=&nbsp;list_first_entry(&amp;wrk,&nbsp;struct&nbsp;net_device,&nbsp;link_watch_list);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;list_del_init(&amp;dev-&gt;link_watch_list);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/*\u5224\u65ad\u662f\u5426\u53ea\u6267\u884c\u7d27\u6025\u4e8b\u4ef6&nbsp;*\/\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(urgent_only&nbsp;&amp;&amp;&nbsp;!linkwatch_urgent_event(dev))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;list_add_tail(&amp;dev-&gt;link_watch_list,&nbsp;&amp;lweventlist);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;continue;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;spin_unlock_irq(&amp;lweventlist_lock);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_do_dev(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;spin_lock_irq(&amp;lweventlist_lock);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!list_empty(&amp;lweventlist)){\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_schedule_work(0);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;spin_unlock_irq(&amp;lweventlist_lock);\n}\n&nbsp;\nstatic&nbsp;void&nbsp;linkwatch_do_dev(struct&nbsp;net_device&nbsp;*dev)\n{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rfc2863_policy(dev);\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(dev-&gt;flags&nbsp;&amp;&nbsp;IFF_UP)&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(netif_carrier_ok(dev))\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_activate(dev);\/\/\u542f\u52a8tx\u961f\u5217\u6d41\u91cf\u63a7\u5236\u529f\u80fd\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_deactivate(dev)\uff1b\/\/\u7981\u6b62tx\u961f\u5217\u6d41\u91cf\u63a7\u5236\u529f\u80fd\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;netdev_state_change(dev);\/\/\u53d1\u8d77Netlink\u4e8b\u4ef6:NETDEV_CHANGE\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_put(dev);\n}<\/pre>\n<p>\u4eca\u5929\u5173\u4e8e\u300alinux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u7c73\u4e91\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>linux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48 \u600e\u4e48\u5165\u95e8\u6587\u7ae0\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u7c73\u4e91\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300alinux linkwatch\u8fdb\u7a0b\u6307\u7684\u662f\u4ec0\u4e48\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b linux linkwatch\u662f\u201c\u94fe\u63a5\u72b6\u6001\u6539\u53d8\u201d\u8fdb\u7a0b\uff1b\u5728linux \u7f51\u7edc\u534f\u8bae\u6808\u4e2d\uff0clinkwatch\u6a21\u5757\u7528\u6765\u901a\u77e5\u7f51\u5361\u5f53\u524d\u662f\u5426\u80fd\u591f\u8fdb\u884c\u6570\u636e\u4f20\u8f93\uff1b\u5728\u9a71\u52a8\u4e2d\u8c03\u7528\u201cnetif_carrier_on\/netif_carrier_off\u201d\u51fd\u6570\u6765\u901a\u77e5\u7f51\u7edc\u72b6\u6001\u53d8\u5316\u3002 \u94fe\u63a5\u72b6\u6001\u6539\u53d8(linkwatch) \u5728Linux\u7f51\u7edc\u534f\u8bae\u6808\u4e2dlinkwatch\u6a21\u5757\u7528\u6765\u901a\u77e5\u7f51\u5361\u5f53\u524d\u662f\u5426\u80fd\u591f\u8fdb\u884c\u6570\u636e\u4f20\u8f93. \u9a71\u52a8\u4e2d\u8c03\u7528netif_carrier_on\/netif_carrier_off\u51fd\u6570\u6765\u901a\u77e5\u7f51\u7edc\u72b6\u6001\u53d8\u5316. \u4e3b\u8981\u4f5c\u7528: \u542f\u52a8\/\u7981\u6b62 TX\u961f\u5217\u7684\u6d41\u91cf\u63a7\u5236\u529f\u80fd \u53d1\u8d77netlink\u6d88\u606fNETDEV_CHANGE\u5230\u7528\u6237\u7a7a\u95f4 void&nbsp;netif_carrier_on(struct&nbsp;net_device&nbsp;*dev) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(test_and_clear_bit(__LINK_STATE_NOCARRIER,&nbsp;&amp;dev-&gt;state))&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(dev-&gt;reg_state&nbsp;==&nbsp;NETREG_UNINITIALIZED) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_fire_event(dev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(netif_running(dev)) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;__netdev_watchdog_up(dev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} } void&nbsp;netif_carrier_off(struct&nbsp;net_device&nbsp;*dev) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!test_and_set_bit(__LINK_STATE_NOCARRIER,&nbsp;&amp;dev-&gt;state))&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(dev-&gt;reg_state&nbsp;==&nbsp;NETREG_UNINITIALIZED) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_fire_event(dev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} } linwatch\u6a21\u5757\uff0c\u53ea\u9700\u8981\u77e5\u9053\u72b6\u6001\u6539\u53d8\u4e86\uff0c\u4e0d\u9700\u8981\u77e5\u9053\u5177\u4f53\u662fon\u8fd8\u662foff void&nbsp;linkwatch_fire_event(struct&nbsp;net_device&nbsp;*dev) { &nbsp;&nbsp;&nbsp;\/*\u5224\u65ad\u662f\u5426\u4e3a\u7d27\u6025\u4e8b\u4ef6,&nbsp;\u5185\u6838\u89c4\u5b9a\u4e24\u6b21\u4e8b\u4ef6\u7684\u95f4\u9694\u81f3\u5c11\u4e3a1\u4e2aHZ*\/ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bool&nbsp;urgent&nbsp;=&nbsp;linkwatch_urgent_event(dev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!test_and_set_bit(__LINK_STATE_LINKWATCH_PENDING,&nbsp;&amp;dev-&gt;state))&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_add_event(dev);\/\/\u628adev\u6dfb\u52a0\u5230lweventlist\u94fe\u8868 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;else&nbsp;if&nbsp;(!urgent) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return; &nbsp;&nbsp;&nbsp;\/*\u8c03\u7528\u5de5\u4f5c\u961f\u5217linkwatch_event&nbsp;*\/ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;linkwatch_schedule_work(urgent); } &nbsp; static&nbsp;void&nbsp;__linkwatch_run_queue(int&nbsp;urgent_only) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;struct&nbsp;net_device&nbsp;*dev; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LIST_HEAD(wrk); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while&nbsp;(!list_empty(&amp;wrk))&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev&nbsp;=&nbsp;list_first_entry(&amp;wrk,&nbsp;struct&nbsp;net_device,&nbsp;link_watch_list); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;list_del_init(&amp;dev-&gt;link_watch_list); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/*\u5224\u65ad\u662f\u5426\u53ea\u6267\u884c\u7d27\u6025\u4e8b\u4ef6&nbsp;*\/ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(urgent_only&nbsp;&amp;&amp;&nbsp;!linkwatch_urgent_event(dev))&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;list_add_tail(&amp;dev-&gt;link_watch_list,&nbsp;&amp;lweventlist); [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-52160","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=52160"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52160\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}