[src/trunk]: src/sys/net Add a capability bit that indicates support for Giga...

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

details:   https://anonhg.NetBSD.org/src/rev/7ee1d7a2eba8
branches:  trunk
changeset: 510635:7ee1d7a2eba8
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sun Jun 03 03:07:39 2001 +0000

description:
Add a capability bit that indicates support for Gigabit Ethernet
jumbo frames, and use it in SIOCSIFMTU.

diffstat:

 sys/net/if_ether.h     |   5 ++++-
 sys/net/if_ethersubr.c |  13 +++++++++++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diffs (64 lines):

diff -r d7b6a302ff0e -r 7ee1d7a2eba8 sys/net/if_ether.h
--- a/sys/net/if_ether.h        Sun Jun 03 02:48:45 2001 +0000
+++ b/sys/net/if_ether.h        Sun Jun 03 03:07:39 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_ether.h,v 1.23 2001/04/07 18:01:48 thorpej Exp $    */
+/*     $NetBSD: if_ether.h,v 1.24 2001/06/03 03:07:40 thorpej Exp $    */
 
 /*
  * Copyright (c) 1982, 1986, 1993
@@ -47,6 +47,7 @@
 #define        ETHER_HDR_LEN   ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN)
 #define        ETHER_MIN_LEN   64      /* minimum frame length, including CRC */
 #define        ETHER_MAX_LEN   1518    /* maximum frame length, including CRC */
+#define        ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */
 
 /*
  * Some Ethernet extensions.
@@ -74,6 +75,7 @@
 
 #define        ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
 
+#define        ETHERMTU_JUMBO  (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN)
 #define        ETHERMTU        (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
 #define        ETHERMIN        (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN)
 
@@ -155,6 +157,7 @@
 
 #define        ETHERCAP_VLAN_MTU       0x00000001      /* VLAN-compatible MTU */
 #define        ETHERCAP_VLAN_HWTAGGING 0x00000002      /* hardware VLAN tag support */
+#define        ETHERCAP_JUMBO_MTU      0x00000004      /* 9000 byte MTU supported */
 
 #ifdef _KERNEL
 extern u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
diff -r d7b6a302ff0e -r 7ee1d7a2eba8 sys/net/if_ethersubr.c
--- a/sys/net/if_ethersubr.c    Sun Jun 03 02:48:45 2001 +0000
+++ b/sys/net/if_ethersubr.c    Sun Jun 03 03:07:39 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_ethersubr.c,v 1.81 2001/04/29 09:50:37 martin Exp $ */
+/*     $NetBSD: if_ethersubr.c,v 1.82 2001/06/03 03:07:39 thorpej Exp $        */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -1385,11 +1385,20 @@
                break;
 
        case SIOCSIFMTU:
-               if (ifr->ifr_mtu > ETHERMTU)
+           {
+               int maxmtu;
+
+               if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU)
+                       maxmtu = ETHERMTU_JUMBO;
+               else
+                       maxmtu = ETHERMTU;
+
+               if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu)
                        error = EINVAL;
                else
                        ifp->if_mtu = ifr->ifr_mtu;
                break;
+           }
 
        case SIOCSIFFLAGS:
                if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) {