Module Name: src Committed By: martin Date: Fri Aug 4 19:53:43 UTC 2023
Modified Files: src/sys/arch/xen/xen [netbsd-10]: xennetback_xenbus.c Log Message: Pull up following revision(s) (requested by riastradh in ticket #312): sys/arch/xen/xen/xennetback_xenbus.c: revision 1.113 sys/arch/xen/xen/xennetback_xenbus.c: revision 1.114 sys/arch/xen/xen/xennetback_xenbus.c: revision 1.115 Revert "xennetback(4): Omit needless membars in xennetback_connect." PR kern/57560 Revert "xennetback(4): Fix membars in xennetback_rx_copy_process." PR kern/57560 Revert "xennetback(4): Fix xennetback_evthandler loop." PR kern/57560 To generate a diff of this commit: cvs rdiff -u -r1.108.4.1 -r1.108.4.2 src/sys/arch/xen/xen/xennetback_xenbus.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Modified files: Index: src/sys/arch/xen/xen/xennetback_xenbus.c diff -u src/sys/arch/xen/xen/xennetback_xenbus.c:1.108.4.1 src/sys/arch/xen/xen/xennetback_xenbus.c:1.108.4.2 --- src/sys/arch/xen/xen/xennetback_xenbus.c:1.108.4.1 Mon Jul 31 15:23:02 2023 +++ src/sys/arch/xen/xen/xennetback_xenbus.c Fri Aug 4 19:53:43 2023 @@ -1,4 +1,4 @@ -/* $NetBSD: xennetback_xenbus.c,v 1.108.4.1 2023/07/31 15:23:02 martin Exp $ */ +/* $NetBSD: xennetback_xenbus.c,v 1.108.4.2 2023/08/04 19:53:43 martin Exp $ */ /* * Copyright (c) 2006 Manuel Bouyer. @@ -25,7 +25,7 @@ */ #include <sys/cdefs.h> -__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.108.4.1 2023/07/31 15:23:02 martin Exp $"); +__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.108.4.2 2023/08/04 19:53:43 martin Exp $"); #include <sys/types.h> #include <sys/param.h> @@ -497,7 +497,9 @@ xennetback_connect(struct xnetback_insta goto err2; } xneti->xni_evtchn = evop.u.bind_interdomain.local_port; + xen_wmb(); xneti->xni_status = CONNECTED; + xen_wmb(); xneti->xni_ih = xen_intr_establish_xname(-1, &xen_pic, xneti->xni_evtchn, IST_LEVEL, IPL_NET, xennetback_evthandler, @@ -803,7 +805,7 @@ xennetback_evthandler(void *arg) netif_tx_request_t txreq; struct mbuf *m, *m0 = NULL, *mlast = NULL; int receive_pending; - RING_IDX req_cons, req_prod; + RING_IDX req_cons; int queued = 0, m0_len = 0; struct xnetback_xstate *xst; const bool discard = ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != @@ -811,12 +813,17 @@ xennetback_evthandler(void *arg) XENPRINTF(("xennetback_evthandler ")); req_cons = xneti->xni_txring.req_cons; -again: - req_prod = xneti->xni_txring.sring->req_prod; - xen_rmb(); - while (req_cons != req_prod) { + while (1) { + xen_rmb(); /* be sure to read the request before updating */ + xneti->xni_txring.req_cons = req_cons; + xen_wmb(); + RING_FINAL_CHECK_FOR_REQUESTS(&xneti->xni_txring, + receive_pending); + if (receive_pending == 0) + break; RING_COPY_REQUEST(&xneti->xni_txring, req_cons, &txreq); + xen_rmb(); XENPRINTF(("%s pkt size %d\n", xneti->xni_if.if_xname, txreq.size)); req_cons++; @@ -955,12 +962,6 @@ mbuf_fail: queued = 0; } } - xen_wmb(); - RING_FINAL_CHECK_FOR_REQUESTS(&xneti->xni_txring, receive_pending); - if (receive_pending) - goto again; - xneti->xni_txring.req_cons = req_cons; - if (m0) { /* Queue empty, and still unfinished multi-fragment request */ printf("%s: dropped unfinished multi-fragment\n", @@ -1020,13 +1021,14 @@ xennetback_rx_copy_process(struct ifnet } /* update pointer */ + xen_rmb(); xneti->xni_rxring.req_cons += queued; xneti->xni_rxring.rsp_prod_pvt += queued; RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&xneti->xni_rxring, notify); /* send event */ if (notify) { - xen_wmb(); + xen_rmb(); XENPRINTF(("%s receive event\n", xneti->xni_if.if_xname)); hypervisor_notify_via_evtchn(xneti->xni_evtchn);