Date: Mon, 27 Jun 2016 09:34:03 GMT From: vincenzo@FreeBSD.org To: svn-soc-all@FreeBSD.org Subject: socsvn commit: r305576 - soc2016/vincenzo/head/sys/dev/netmap Message-ID: <201606270934.u5R9Y39C027352@socsvn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: vincenzo Date: Mon Jun 27 09:34:03 2016 New Revision: 305576 URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=305576 Log: freebsd: ptnet_transmit: add doublecheck with rescheduling Modified: soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Modified: soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c ============================================================================== --- soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Mon Jun 27 09:33:54 2016 (r305575) +++ soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Mon Jun 27 09:34:03 2016 (r305576) @@ -937,8 +937,20 @@ if (head == ring->tail) { /* Reactivate the interrupts so that we can be notified - * when some netmap slots are made available by the host. */ + * when some free slots are made available by the host. */ ptring->guest_need_kick = 1; + + /* Double check. */ + ptnet_sync_tail(ptring, kring); + if (unlikely(head != ring->tail)) { + RD(1, "Doublecheck finds more slots"); + /* More slots were freed before reactivating + * the interrupts. */ + ptring->guest_need_kick = 0; + if (!drbr_empty(ifp, pq->bufring)) { + taskqueue_enqueue(pq->taskq, &pq->task); + } + } } PTNET_Q_UNLOCK(pq);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201606270934.u5R9Y39C027352>