[src/trunk]: src/sys/net make ether_output() MP-safe, so that if_ether can en...

[knakahara <knakahara%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a752fba9e708
branches:  trunk
changeset: 816175:a752fba9e708
user:      knakahara <knakahara%NetBSD.org@localhost>
date:      Mon Jun 20 07:01:45 2016 +0000

description:
make ether_output() MP-safe, so that if_ether can enable IFEF_OUTPUT_MPSAFE.

making MP-scalable is future work.

diffstat:

 sys/net/if_ethersubr.c |  26 +++++++++++++++++++-------
 1 files changed, 19 insertions(+), 7 deletions(-)

diffs (121 lines):

diff -r 252992f13ad6 -r a752fba9e708 sys/net/if_ethersubr.c
--- a/sys/net/if_ethersubr.c    Mon Jun 20 06:52:44 2016 +0000
+++ b/sys/net/if_ethersubr.c    Mon Jun 20 07:01:45 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_ethersubr.c,v 1.223 2016/06/16 03:03:33 ozaki-r Exp $       */
+/*     $NetBSD: if_ethersubr.c,v 1.224 2016/06/20 07:01:45 knakahara Exp $     */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.223 2016/06/16 03:03:33 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.224 2016/06/20 07:01:45 knakahara Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -204,9 +204,7 @@
        struct at_ifaddr *aa;
 #endif /* NETATALK */
 
-#ifndef NET_MPSAFE
-       KASSERT(KERNEL_LOCKED_P());
-#endif
+       KASSERT(ifp->if_extflags & IFEF_OUTPUT_MPSAFE);
 
 #ifdef MBUFTRACE
        m_claimm(m, ifp->if_mowner);
@@ -238,13 +236,17 @@
 
 #ifdef INET
        case AF_INET:
+               KERNEL_LOCK(1, NULL);
                if (m->m_flags & M_BCAST)
                        (void)memcpy(edst, etherbroadcastaddr, sizeof(edst));
                else if (m->m_flags & M_MCAST)
                        ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst);
                else if ((error = arpresolve(ifp, rt, m, dst, edst,
-                   sizeof(edst))) != 0)
+                   sizeof(edst))) != 0) {
+                       KERNEL_UNLOCK_ONE(NULL);
                        return error == EWOULDBLOCK ? 0 : error;
+               }
+               KERNEL_UNLOCK_ONE(NULL);
                /* If broadcasting on a simplex interface, loopback a copy */
                if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
                        mcopy = m_copy(m, 0, (int)M_COPYALL);
@@ -292,10 +294,12 @@
 #endif
 #ifdef NETATALK
     case AF_APPLETALK:
+               KERNEL_LOCK(1, NULL);
                if (aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) {
 #ifdef NETATALKDEBUG
                        printf("aarpresolv failed\n");
 #endif /* NETATALKDEBUG */
+                       KERNEL_UNLOCK_ONE(NULL);
                        return (0);
                }
                /*
@@ -303,8 +307,10 @@
                 */
                aa = (struct at_ifaddr *) at_ifawithnet(
                    (const struct sockaddr_at *)dst, ifp);
-               if (aa == NULL)
+               if (aa == NULL) {
+                   KERNEL_UNLOCK_ONE(NULL);
                    goto bad;
+               }
 
                /*
                 * In the phase 2 case, we need to prepend an mbuf for the
@@ -325,6 +331,7 @@
                } else {
                        etype = htons(ETHERTYPE_ATALK);
                }
+               KERNEL_UNLOCK_ONE(NULL);
                break;
 #endif /* NETATALK */
        case pseudo_AF_HDRCMPLT:
@@ -349,6 +356,7 @@
        }
 
 #ifdef MPLS
+       KERNEL_LOCK(1, NULL);
        {
                struct m_tag *mtag;
                mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL);
@@ -358,6 +366,7 @@
                        m_tag_delete(m, mtag);
                }
        }
+       KERNEL_UNLOCK_ONE(NULL);
 #endif
 
        if (mcopy)
@@ -410,6 +419,7 @@
 #endif /* NCARP > 0 */
 
 #ifdef ALTQ
+       KERNEL_LOCK(1, NULL);
        /*
         * If ALTQ is enabled on the parent interface, do
         * classification; the queueing discipline might not
@@ -418,6 +428,7 @@
         */
        if (ALTQ_IS_ENABLED(&ifp->if_snd))
                altq_etherclassify(&ifp->if_snd, m);
+       KERNEL_UNLOCK_ONE(NULL);
 #endif
        return ifq_enqueue(ifp, m);
 
@@ -910,6 +921,7 @@
 {
        struct ethercom *ec = (struct ethercom *)ifp;
 
+       ifp->if_extflags |= IFEF_OUTPUT_MPSAFE;
        ifp->if_type = IFT_ETHER;
        ifp->if_hdrlen = ETHER_HDR_LEN;
        ifp->if_dlt = DLT_EN10MB;