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Merge the //depot/user/yar/vlan branch into CVS. It contains some collective

Browse Source 
work by yar, thompsa and myself. The checksum offloading part also involves
work done by Mihail Balikov.

The most important changes:

o   Instead of global linked list of all vlan softc use a per-trunk
  hash. The size of hash is dynamically adjusted, depending on
  number of entries. This changes struct ifnet, replacing counter
  of vlans with a pointer to trunk structure. This change is an
  improvement for setups with big number of VLANs, several interfaces
  and several CPUs. It is a small regression for a setup with a single
  VLAN interface.
    An alternative to dynamic hash is a per-trunk static array with
  4096 entries, which is a compile time option - VLAN_ARRAY. In my
  experiments the array is not an improvement, probably because such
  a big trunk structure doesn't fit into CPU cache.
o   Introduce an UMA zone for VLAN tags. Since drivers depend on it,
  the zone is declared in kern_mbuf.c, not in optional vlan(4) driver.
  This change is a big improvement for any setup utilizing vlan(4).
o   Use rwlock(9) instead of mutex(9) for locking. We are the first
  ones to do this! :)
o   Some drivers can do hardware VLAN tagging + hardware checksum
  offloading. Add an infrastructure for this. Whenever vlan(4) is
  attached to a parent or parent configuration is changed, the flags
  on vlan(4) interface are updated.

In collaboration with:	yar, thompsa
In collaboration with:	Mihail Balikov <mihail.balikov interbgc.com>
This commit is contained in:
Gleb Smirnoff 2006-01-30 13:45:15 +00:00
parent c21a88e7f8
commit 75ee267c22
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=155051
9 changed files with 511 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/conf/options
View File

@ -385,6 +385,8 @@ TCPDEBUG
TCP_SIGNATURE opt_inet.h
TCP_SACK_DEBUG opt_tcp_sack.h
TCP_DROP_SYNFIN opt_tcp_input.h
DEV_VLAN opt_vlan.h
VLAN_ARRAY opt_vlan.h
XBONEHACK
# Netgraph(4). Use option NETGRAPH to enable the base netgraph code.

25
sys/kern/kern_mbuf.c
View File

@ -133,6 +133,7 @@ uma_zone_t zone_jumbo4;
uma_zone_t zone_jumbo9;
uma_zone_t zone_jumbo16;
uma_zone_t zone_ext_refcnt;
uma_zone_t zone_mtag_vlan;
/*
* Local prototypes.
@ -145,6 +146,7 @@ static void mb_dtor_clust(void *, int, void *);
static void mb_dtor_pack(void *, int, void *);
static int mb_zinit_pack(void *, int, int);
static void mb_zfini_pack(void *, int);
static int mt_zinit_vlan(void *, int, int);
static void mb_reclaim(void *);
static void mbuf_init(void *);
@ -225,6 +227,12 @@ mbuf_init(void *dummy)
NULL, NULL,
UMA_ALIGN_PTR, UMA_ZONE_ZINIT);
zone_mtag_vlan = uma_zcreate("mtag_vlan",
sizeof(struct m_tag) + sizeof(u_int),
NULL, NULL,
mt_zinit_vlan, NULL,
UMA_ALIGN_INT, 0);
/* uma_prealloc() goes here... */
/*
@ -511,6 +519,23 @@ mb_ctor_pack(void *mem, int size, void *arg, int how)
return (0);
}
static void
mt_vlan_free(struct m_tag *mtag)
{
uma_zfree(zone_mtag_vlan, mtag);
}
static int
mt_zinit_vlan(void *mem, int size, int how)
{
struct m_tag *mtag = (struct m_tag *)mem;
m_tag_setup(mtag, MTAG_VLAN, MTAG_VLAN_TAG, sizeof(u_int));
mtag->m_tag_free = mt_vlan_free;
return (0);
}
/*
* This is the protocol drain routine.
*

3
sys/net/if.c
View File

@ -1040,6 +1040,7 @@ if_route(struct ifnet *ifp, int flag, int fam)
}
void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */
void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
/*
* Handle a change in the interface link state. To avoid LORs
@ -1075,7 +1076,7 @@ do_link_state_change(void *arg, int pending)
else
link = NOTE_LINKINV;
KNOTE_UNLOCKED(&ifp->if_klist, link);
if (ifp->if_nvlans != 0)
if (ifp->if_vlantrunk != NULL)
(*vlan_link_state_p)(ifp, link);
if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&

1
sys/net/if.h
View File

@ -191,6 +191,7 @@ struct if_data {
#define IFCAP_VLAN_HWTAGGING 0x0010 /* hardware VLAN tag support */
#define IFCAP_JUMBO_MTU 0x0020 /* 9000 byte MTU supported */
#define IFCAP_POLLING 0x0040 /* driver supports polling */
#define IFCAP_VLAN_HWCSUM 0x0080 /* can do IFCAP_HWCSUM on VLANs */
#define IFCAP_HWCSUM (IFCAP_RXCSUM | IFCAP_TXCSUM)

6
sys/net/if_ethersubr.c
View File

@ -623,7 +623,7 @@ ether_demux(struct ifnet *ifp, struct mbuf *m)
if (!(ifp->if_bridge) &&
!((ether_type == ETHERTYPE_VLAN || m->m_flags & M_VLANTAG) &&
ifp->if_nvlans > 0)) {
ifp->if_vlantrunk != NULL)) {
#ifdef DEV_CARP
/*
* XXX: Okay, we need to call carp_forus() and - if it is for
@ -696,7 +696,7 @@ ether_demux(struct ifnet *ifp, struct mbuf *m)
/*
* If no VLANs are configured, drop.
*/
if (ifp->if_nvlans == 0) {
if (ifp->if_vlantrunk == NULL) {
ifp->if_noproto++;
m_freem(m);
return;
@ -716,7 +716,7 @@ ether_demux(struct ifnet *ifp, struct mbuf *m)
*/
switch (ether_type) {
case ETHERTYPE_VLAN:
if (ifp->if_nvlans != 0) {
if (ifp->if_vlantrunk != NULL) {
KASSERT(vlan_input_p,("ether_input: VLAN not loaded!"));
(*vlan_input_p)(ifp, m);
} else {

3
sys/net/if_var.h
View File

@ -69,6 +69,7 @@ struct rt_addrinfo;
struct socket;
struct ether_header;
struct carp_if;
struct ifvlantrunk;
#endif
#include <sys/queue.h> /* get TAILQ macros */
@ -133,7 +134,7 @@ struct ifnet {
struct bpf_if *if_bpf; /* packet filter structure */
u_short if_index; /* numeric abbreviation for this if */
short if_timer; /* time 'til if_watchdog called */
u_short if_nvlans; /* number of active vlans */
struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
int if_flags; /* up/down, broadcast, etc. */
int if_capabilities; /* interface capabilities */
int if_capenable; /* enabled features */

581
sys/net/if_vlan.c
View File

@ -42,12 +42,15 @@
*/
#include "opt_inet.h"
#include "opt_vlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
@ -69,6 +72,24 @@
#endif
#define VLANNAME "vlan"
#define VLAN_DEF_HWIDTH 4
LIST_HEAD(ifvlanhead, ifvlan);
struct ifvlantrunk {
struct ifnet *parent; /* parent interface of this trunk */
struct rwlock rw;
#ifdef VLAN_ARRAY
struct ifvlan *vlans[EVL_VLID_MASK+1]; /* static table */
#else
struct ifvlanhead *hash; /* dynamic hash-list table */
uint16_t hmask;
uint16_t hwidth;
#endif
int refcnt;
LIST_ENTRY(ifvlantrunk) trunk_entry;
};
static LIST_HEAD(, ifvlantrunk) trunk_list;
struct vlan_mc_entry {
struct ether_addr mc_addr;
@ -76,18 +97,20 @@ struct vlan_mc_entry {
};
struct ifvlan {
struct ifvlantrunk *ifv_trunk;
struct ifnet *ifv_ifp;
struct ifnet *ifv_p; /* parent inteface of this vlan */
#define TRUNK(ifv) ((ifv)->ifv_trunk)
#define PARENT(ifv) ((ifv)->ifv_trunk->parent)
int ifv_pflags; /* special flags we have set on parent */
struct ifv_linkmib {
int ifvm_parent;
int ifvm_encaplen; /* encapsulation length */
int ifvm_mtufudge; /* MTU fudged by this much */
int ifvm_mintu; /* min transmission unit */
u_int16_t ifvm_proto; /* encapsulation ethertype */
u_int16_t ifvm_tag; /* tag to apply on packets leaving if */
uint16_t ifvm_proto; /* encapsulation ethertype */
uint16_t ifvm_tag; /* tag to apply on packets leaving if */
} ifv_mib;
SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead;
SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead;
LIST_ENTRY(ifvlan) ifv_list;
};
#define ifv_tag ifv_mib.ifvm_tag
@ -95,7 +118,7 @@ struct ifvlan {
#define ifv_mtufudge ifv_mib.ifvm_mtufudge
#define ifv_mintu ifv_mib.ifvm_mintu
/* Special flags we should propagate to parent */
/* Special flags we should propagate to parent. */
static struct {
int flag;
int (*func)(struct ifnet *, int);
@ -110,19 +133,44 @@ SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface");
static LIST_HEAD(, ifvlan) ifv_list;
/*
* Locking: one lock is used to guard both the ifv_list and modification
* to vlan data structures. We are rather conservative here; probably
* more than necessary.
* We have a global mutex, that is used to serialize configuration
* changes and isn't used in normal packet delivery.
*
* We also have a per-trunk rwlock, that is locked shared on packet
* processing and exclusive when configuration is changed.
*
* The VLAN_ARRAY substitutes the dynamic hash with a static array
* with 4096 entries. In theory this can give a boots in processing,
* however on practice it does not. Probably this is because array
* is too big to fit into CPU cache.
*/
static struct mtx ifv_mtx;
#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, VLANNAME, NULL, MTX_DEF)
#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF)
#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx)
#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED)
#define VLAN_LOCK() mtx_lock(&ifv_mtx)
#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx)
#define VLAN_LOCK() mtx_lock(&ifv_mtx)
#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx)
#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME)
#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw)
#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw)
#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw)
#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED)
#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw)
#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw)
#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED)
#ifndef VLAN_ARRAY
static void vlan_inithash(struct ifvlantrunk *trunk);
static void vlan_freehash(struct ifvlantrunk *trunk);
static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv);
static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch);
static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk,
uint16_t tag);
#endif
static void trunk_destroy(struct ifvlantrunk *trunk);
static void vlan_start(struct ifnet *ifp);
static void vlan_ifinit(void *foo);
@ -133,8 +181,10 @@ static int vlan_setflag(struct ifnet *ifp, int flag, int status,
static int vlan_setflags(struct ifnet *ifp, int status);
static int vlan_setmulti(struct ifnet *ifp);
static int vlan_unconfig(struct ifnet *ifp);
static int vlan_config(struct ifvlan *ifv, struct ifnet *p);
static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag);
static void vlan_link_state(struct ifnet *ifp, int link);
static void vlan_capabilities(struct ifvlan *ifv);
static void vlan_trunk_capabilities(struct ifnet *ifp);
static struct ifnet *vlan_clone_match_ethertag(struct if_clone *,
const char *, int *);
@ -145,6 +195,196 @@ static int vlan_clone_destroy(struct if_clone *, struct ifnet *);
static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL,
IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy);
#ifndef VLAN_ARRAY
#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m))
static void
vlan_inithash(struct ifvlantrunk *trunk)
{
int i, n;
/*
* The trunk must not be locked here since we call malloc(M_WAITOK).
* It is OK in case this function is called before the trunk struct
* gets hooked up and becomes visible from other threads.
*/
KASSERT(trunk->hwidth == 0 && trunk->hash == NULL,
("%s: hash already initialized", __func__));
trunk->hwidth = VLAN_DEF_HWIDTH;
n = 1 << trunk->hwidth;
trunk->hmask = n - 1;
trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK);
for (i = 0; i < n; i++)
LIST_INIT(&trunk->hash[i]);
}
static void
vlan_freehash(struct ifvlantrunk *trunk)
{
#ifdef INVARIANTS
int i;
TRUNK_LOCK_ASSERT(trunk); /* XXX just unhook trunk first? */
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
for (i = 0; i < (1 << trunk->hwidth); i++)
KASSERT(LIST_EMPTY(&trunk->hash[i]),
("%s: hash table not empty", __func__));
#endif
free(trunk->hash, M_VLAN);
trunk->hash = NULL;
trunk->hwidth = trunk->hmask = 0;
}
static int
vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
{
int i, b;
struct ifvlan *ifv2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
b = 1 << trunk->hwidth;
i = HASH(ifv->ifv_tag, trunk->hmask);
LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
if (ifv->ifv_tag == ifv2->ifv_tag)
return (EEXIST);
/*
* Grow the hash when the number of vlans exceeds half of the number of
* hash buckets squared. This will make the average linked-list length
* buckets/2.
*/
if (trunk->refcnt > (b * b) / 2) {
vlan_growhash(trunk, 1);
i = HASH(ifv->ifv_tag, trunk->hmask);
}
LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list);
trunk->refcnt++;
return (0);
}
static int
vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv)
{
int i, b;
struct ifvlan *ifv2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
b = 1 << trunk->hwidth;
i = HASH(ifv->ifv_tag, trunk->hmask);
LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list)
if (ifv2 == ifv) {
trunk->refcnt--;
LIST_REMOVE(ifv2, ifv_list);
if (trunk->refcnt < (b * b) / 2)
vlan_growhash(trunk, -1);
return (0);
}
panic("%s: vlan not found\n", __func__);
return (ENOENT); /*NOTREACHED*/
}
/*
* Grow the hash larger or smaller if memory permits.
*/
static void
vlan_growhash(struct ifvlantrunk *trunk, int howmuch)
{
struct ifvlan *ifv;
struct ifvlanhead *hash2;
int hwidth2, i, j, n, n2;
TRUNK_LOCK_ASSERT(trunk);
KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__));
if (howmuch == 0) {
/* Harmless yet obvious coding error */
printf("%s: howmuch is 0\n", __func__);
return;
}
hwidth2 = trunk->hwidth + howmuch;
n = 1 << trunk->hwidth;
n2 = 1 << hwidth2;
/* Do not shrink the table below the default */
if (hwidth2 < VLAN_DEF_HWIDTH)
return;
/* M_NOWAIT because we're called with trunk mutex held */
hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT);
if (hash2 == NULL) {
printf("%s: out of memory -- hash size not changed\n",
__func__);
return; /* We can live with the old hash table */
}
for (j = 0; j < n2; j++)
LIST_INIT(&hash2[j]);
for (i = 0; i < n; i++)
while (!LIST_EMPTY(&trunk->hash[i])) {
ifv = LIST_FIRST(&trunk->hash[i]);
LIST_REMOVE(ifv, ifv_list);
j = HASH(ifv->ifv_tag, n2 - 1);
LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list);
}
free(trunk->hash, M_VLAN);
trunk->hash = hash2;
trunk->hwidth = hwidth2;
trunk->hmask = n2 - 1;
}
static __inline struct ifvlan *
vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag)
{
struct ifvlan *ifv;
TRUNK_LOCK_RASSERT(trunk);
LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list)
if (ifv->ifv_tag == tag)
return (ifv);
return (NULL);
}
#if 0
/* Debugging code to view the hashtables. */
static void
vlan_dumphash(struct ifvlantrunk *trunk)
{
int i;
struct ifvlan *ifv;
for (i = 0; i < (1 << trunk->hwidth); i++) {
printf("%d: ", i);
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
printf("%s ", ifv->ifv_ifp->if_xname);
printf("\n");
}
}
#endif /* 0 */
#endif /* !VLAN_ARRAY */
static void
trunk_destroy(struct ifvlantrunk *trunk)
{
VLAN_LOCK_ASSERT();
TRUNK_LOCK(trunk);
#ifndef VLAN_ARRAY
vlan_freehash(trunk);
#endif
TRUNK_LOCK_DESTROY(trunk);
LIST_REMOVE(trunk, trunk_entry);
trunk->parent->if_vlantrunk = NULL;
free(trunk, M_VLAN);
}
/*
* Program our multicast filter. What we're actually doing is
* programming the multicast filter of the parent. This has the
@ -170,14 +410,7 @@ vlan_setmulti(struct ifnet *ifp)
/* Find the parent. */
sc = ifp->if_softc;
ifp_p = sc->ifv_p;
/*
* If we don't have a parent, just remember the membership for
* when we do.
*/
if (ifp_p == NULL)
return (0);
ifp_p = PARENT(sc);
bzero((char *)&sdl, sizeof(sdl));
sdl.sdl_len = sizeof(sdl);
@ -223,12 +456,6 @@ vlan_setmulti(struct ifnet *ifp)
* into this code through vlan_input_p which is defined there and
* set here. Noone else in the system should be aware of this so
* we use an explicit reference here.
*
* NB: Noone should ever need to check if vlan_input_p is null or
* not. This is because interfaces have a count of the number
* of active vlans (if_nvlans) and this should never be bumped
* except by vlan_config--which is in this module so therefore
* the module must be loaded and vlan_input_p must be non-NULL.
*/
extern void (*vlan_input_p)(struct ifnet *, struct mbuf *);
@ -241,18 +468,28 @@ vlan_modevent(module_t mod, int type, void *data)
switch (type) {
case MOD_LOAD:
LIST_INIT(&ifv_list);
LIST_INIT(&trunk_list);
VLAN_LOCK_INIT();
vlan_input_p = vlan_input;
vlan_link_state_p = vlan_link_state;
vlan_trunk_cap_p = vlan_trunk_capabilities;
if_clone_attach(&vlan_cloner);
break;
case MOD_UNLOAD:
{
struct ifvlantrunk *trunk, *trunk1;
if_clone_detach(&vlan_cloner);
vlan_input_p = NULL;
vlan_link_state_p = NULL;
vlan_trunk_cap_p = NULL;
VLAN_LOCK();
LIST_FOREACH_SAFE(trunk, &trunk_list, trunk_entry, trunk1)
trunk_destroy(trunk);
VLAN_UNLOCK();
VLAN_LOCK_DESTROY();
break;
}
default:
return (EOPNOTSUPP);
}
@ -397,31 +634,22 @@ vlan_clone_create(struct if_clone *ifc, char *name, size_t len)
ifp->if_type = IFT_L2VLAN;
ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN;
VLAN_LOCK();
LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list);
VLAN_UNLOCK();
if (ethertag) {
VLAN_LOCK();
error = vlan_config(ifv, p);
error = vlan_config(ifv, p, tag);
if (error != 0) {
/*
* Since we've partialy failed, we need to back
* out all the way, otherwise userland could get
* confused. Thus, we destroy the interface.
*/
LIST_REMOVE(ifv, ifv_list);
vlan_unconfig(ifp);
VLAN_UNLOCK();
ether_ifdetach(ifp);
if_free_type(ifp, IFT_ETHER);
free(ifv, M_VLAN);
return (error);
}
ifv->ifv_tag = tag;
ifp->if_drv_flags |= IFF_DRV_RUNNING;
VLAN_UNLOCK();
/* Update flags on the parent, if necessary. */
vlan_setflags(ifp, 1);
@ -438,10 +666,7 @@ vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
unit = ifp->if_dunit;
VLAN_LOCK();
LIST_REMOVE(ifv, ifv_list);
vlan_unconfig(ifp);
VLAN_UNLOCK();
ether_ifdetach(ifp);
if_free_type(ifp, IFT_ETHER);
@ -475,12 +700,11 @@ vlan_start(struct ifnet *ifp)
{
struct ifvlan *ifv;
struct ifnet *p;
struct ether_vlan_header *evl;
struct mbuf *m;
int error;
ifv = ifp->if_softc;
p = ifv->ifv_p;
p = PARENT(ifv);
for (;;) {
IF_DEQUEUE(&ifp->if_snd, m);
@ -507,10 +731,8 @@ vlan_start(struct ifnet *ifp)
* packet tag that holds it.
*/
if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
struct m_tag *mtag = m_tag_alloc(MTAG_VLAN,
MTAG_VLAN_TAG,
sizeof(u_int),
M_NOWAIT);
struct m_tag *mtag = (struct m_tag *)
uma_zalloc(zone_mtag_vlan, M_NOWAIT);
if (mtag == NULL) {
ifp->if_oerrors++;
m_freem(m);
@ -520,6 +742,8 @@ vlan_start(struct ifnet *ifp)
m_tag_prepend(m, mtag);
m->m_flags |= M_VLANTAG;
} else {
struct ether_vlan_header *evl;
M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT);
if (m == NULL) {
if_printf(ifp,
@ -570,10 +794,12 @@ vlan_start(struct ifnet *ifp)
static void
vlan_input(struct ifnet *ifp, struct mbuf *m)
{
struct ether_vlan_header *evl;
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
struct m_tag *mtag;
u_int tag;
uint16_t tag;
KASSERT(trunk != NULL, ("%s: no trunk", __func__));
if (m->m_flags & M_VLANTAG) {
/*
@ -587,6 +813,8 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
m_tag_delete(m, mtag);
m->m_flags &= ~M_VLANTAG;
} else {
struct ether_vlan_header *evl;
/*
* Packet is tagged in-band as specified by 802.1q.
*/
@ -613,7 +841,7 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
evl->evl_encap_proto = evl->evl_proto;
break;
default:
tag = (u_int) -1;
tag = (uint16_t) -1;
#ifdef INVARIANTS
panic("%s: unsupported if_type (%u)",
__func__, ifp->if_type);
@ -622,23 +850,26 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
}
}
VLAN_LOCK();
LIST_FOREACH(ifv, &ifv_list, ifv_list)
if (ifp == ifv->ifv_p && tag == ifv->ifv_tag)
break;
/*
* In VLAN_ARRAY case we proceed completely lockless.
*/
#ifdef VLAN_ARRAY
ifv = trunk->vlans[tag];
if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) {
VLAN_UNLOCK();
m_freem(m);
ifp->if_noproto++;
#ifdef DEBUG
printf("%s: tag %d, no interface\n", __func__, tag);
#endif
return;
}
VLAN_UNLOCK(); /* XXX extend below? */
#ifdef DEBUG
printf("%s: tag %d, parent %s\n", __func__, tag, ifv->ifv_p->if_xname);
#else
TRUNK_RLOCK(trunk);
ifv = vlan_gethash(trunk, tag);
if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) {
TRUNK_RUNLOCK(trunk);
m_freem(m);
ifp->if_noproto++;
return;
}
TRUNK_RUNLOCK(trunk);
#endif
if (mtag == NULL) {
@ -661,28 +892,58 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
}
static int
vlan_config(struct ifvlan *ifv, struct ifnet *p)
vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag)
{
struct ifvlantrunk *trunk;
struct ifnet *ifp;
int error = 0;
VLAN_LOCK_ASSERT();
/* VID numbers 0x0 and 0xFFF are reserved */
if (tag == 0 || tag == 0xFFF)
return (EINVAL);
if (p->if_type != IFT_ETHER)
return (EPROTONOSUPPORT);
if (ifv->ifv_p)
if (ifv->ifv_trunk)
return (EBUSY);
if (p->if_vlantrunk == NULL) {
trunk = malloc(sizeof(struct ifvlantrunk),
M_VLAN, M_WAITOK | M_ZERO);
VLAN_LOCK();
if (p->if_vlantrunk != NULL) {
/* A race that that is very unlikely to be hit. */
free(trunk, M_VLAN);
goto exists;
}
#ifndef VLAN_ARRAY
vlan_inithash(trunk);
#endif
TRUNK_LOCK_INIT(trunk);
LIST_INSERT_HEAD(&trunk_list, trunk, trunk_entry);
TRUNK_LOCK(trunk);
p->if_vlantrunk = trunk;
trunk->parent = p;
} else {
VLAN_LOCK();
exists:
trunk = p->if_vlantrunk;
TRUNK_LOCK(trunk);
}
ifv->ifv_tag = tag;
#ifdef VLAN_ARRAY
if (trunk->vlans[tag] != NULL)
error = EEXIST;
#else
error = vlan_inshash(trunk, ifv);
#endif
if (error)
goto done;
ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN;
ifv->ifv_mintu = ETHERMIN;
ifv->ifv_pflags = 0;
/*
* The active VLAN counter on the parent is used
* at various places to see if there is a vlan(4)
* attached to this physical interface.
*/
p->if_nvlans++;
/*
* If the parent supports the VLAN_MTU capability,
* i.e. can Tx/Rx larger than ETHER_MAX_LEN frames,
@ -705,10 +966,10 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p)
ifv->ifv_mtufudge = ifv->ifv_encaplen;
}
ifv->ifv_p = p;
ifv->ifv_trunk = trunk;
ifp = ifv->ifv_ifp;
ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge;
ifv->ifv_ifp->if_baudrate = p->if_baudrate;
ifp->if_baudrate = p->if_baudrate;
/*
* Copy only a selected subset of flags from the parent.
* Other flags are none of our business.
@ -721,20 +982,7 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p)
ifp->if_link_state = p->if_link_state;
#if 0
/*
* Not ready yet. We need notification from the parent
* when hw checksumming flags in its if_capenable change.
* Flags set in if_capabilities only are useless.
*/
/*
* If the parent interface can do hardware-assisted
* VLAN encapsulation, then propagate its hardware-
* assisted checksumming flags.
*/
if (p->if_capabilities & IFCAP_VLAN_HWTAGGING)
ifp->if_capabilities |= p->if_capabilities & IFCAP_HWCSUM;
#endif
vlan_capabilities(ifv);
/*
* Set up our ``Ethernet address'' to reflect the underlying
@ -748,24 +996,40 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p)
*/
(void)vlan_setmulti(ifp); /* XXX: VLAN lock held */
return (0);
#ifdef VLAN_ARRAY
atomic_store_rel_ptr((uintptr_t *)&trunk->vlans[tag], (uintptr_t)ifv);
trunk->refcnt++;
#endif
done:
TRUNK_UNLOCK(trunk);
VLAN_UNLOCK();
return (error);
}
static int
vlan_unconfig(struct ifnet *ifp)
{
struct ifvlantrunk *trunk;
struct vlan_mc_entry *mc;
struct ifvlan *ifv;
struct ifnet *p;
int error;
VLAN_LOCK_ASSERT();
VLAN_LOCK();
ifv = ifp->if_softc;
p = ifv->ifv_p;
trunk = ifv->ifv_trunk;
if (p) {
if (trunk) {
struct sockaddr_dl sdl;
struct ifnet *p = trunk->parent;
TRUNK_LOCK(trunk);
#ifdef VLAN_ARRAY
atomic_store_rel_ptr((uintptr_t *)&trunk->vlans[ifv->ifv_tag],
(uintptr_t)NULL);
trunk->refcnt--;
#endif
/*
* Since the interface is being unconfigured, we need to
@ -791,19 +1055,43 @@ vlan_unconfig(struct ifnet *ifp)
}
vlan_setflags(ifp, 0); /* clear special flags on parent */
p->if_nvlans--;
#ifndef VLAN_ARRAY
vlan_remhash(trunk, ifv);
#endif
ifv->ifv_trunk = NULL;
/*
* Check if we were the last.
*/
if (trunk->refcnt == 0) {
atomic_store_rel_ptr((uintptr_t *)
&trunk->parent->if_vlantrunk,
(uintptr_t)NULL);
/*
* XXXGL: If some ithread has already entered
* vlan_input() and is now blocked on the trunk
* lock, then it should preempt us right after
* unlock and finish its work. Then we will acquire
* lock again in trunk_destroy().
* XXX: not true in case of VLAN_ARRAY
*/
TRUNK_UNLOCK(trunk);
trunk_destroy(trunk);
} else
TRUNK_UNLOCK(trunk);
}
/* Disconnect from parent. */
if (ifv->ifv_pflags)
if_printf(ifp, "%s: ifv_pflags unclean\n", __func__);
ifv->ifv_p = NULL;
ifv->ifv_ifp->if_mtu = ETHERMTU; /* XXX why not 0? */
ifv->ifv_ifp->if_link_state = LINK_STATE_UNKNOWN;
/* Clear our MAC address. */
bzero(IF_LLADDR(ifv->ifv_ifp), ETHER_ADDR_LEN);
VLAN_UNLOCK();
return (0);
}
@ -831,7 +1119,7 @@ vlan_setflag(struct ifnet *ifp, int flag, int status,
* in accord with actual parent's flags.
*/
if (status != (ifv->ifv_pflags & flag)) {
error = (*func)(ifv->ifv_p, status);
error = (*func)(PARENT(ifv), status);
if (error)
return (error);
ifv->ifv_pflags &= ~flag;
@ -863,15 +1151,71 @@ vlan_setflags(struct ifnet *ifp, int status)
static void
vlan_link_state(struct ifnet *ifp, int link)
{
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
int i;
VLAN_LOCK();
LIST_FOREACH(ifv, &ifv_list, ifv_list) {
if (ifv->ifv_p == ifp)
TRUNK_LOCK(trunk);
#ifdef VLAN_ARRAY
for (i = 0; i < EVL_VLID_MASK+1; i++)
if (trunk->vlans[i] != NULL) {
ifv = trunk->vlans[i];
#else
for (i = 0; i < (1 << trunk->hwidth); i++) {
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
#endif
if_link_state_change(ifv->ifv_ifp,
ifv->ifv_p->if_link_state);
trunk->parent->if_link_state);
}
VLAN_UNLOCK();
TRUNK_UNLOCK(trunk);
}
static void
vlan_capabilities(struct ifvlan *ifv)
{
struct ifnet *p = PARENT(ifv);
struct ifnet *ifp = ifv->ifv_ifp;
TRUNK_LOCK_ASSERT(TRUNK(ifv));
/*
* If the parent interface can do checksum offloading
* on VLANs, then propagate its hardware-assisted
* checksumming flags. Also assert that checksum
* offloading requires hardware VLAN tagging.
*/
if (p->if_capabilities & IFCAP_VLAN_HWCSUM)
ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM;
if (p->if_capenable & IFCAP_VLAN_HWCSUM &&
p->if_capenable & IFCAP_VLAN_HWTAGGING) {
ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM;
ifp->if_hwassist = p->if_hwassist;
} else {
ifp->if_capenable = 0;
ifp->if_hwassist = 0;
}
}
static void
vlan_trunk_capabilities(struct ifnet *ifp)
{
struct ifvlantrunk *trunk = ifp->if_vlantrunk;
struct ifvlan *ifv;
int i;
TRUNK_LOCK(trunk);
#ifdef VLAN_ARRAY
for (i = 0; i < EVL_VLID_MASK+1; i++)
if (trunk->vlans[i] != NULL) {
ifv = trunk->vlans[i];
#else
for (i = 0; i < (1 << trunk->hwidth); i++) {
LIST_FOREACH(ifv, &trunk->hash[i], ifv_list)
#endif
vlan_capabilities(ifv);
}
TRUNK_UNLOCK(trunk);
}
static int
@ -915,8 +1259,8 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
case SIOCGIFMEDIA:
VLAN_LOCK();
if (ifv->ifv_p != NULL) {
error = (*ifv->ifv_p->if_ioctl)(ifv->ifv_p,
if (TRUNK(ifv) != NULL) {
error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv),
SIOCGIFMEDIA, data);
VLAN_UNLOCK();
/* Limit the result to the parent's current config. */
@ -946,9 +1290,9 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
* Set the interface MTU.
*/
VLAN_LOCK();
if (ifv->ifv_p != NULL) {
if (TRUNK(ifv) != NULL) {
if (ifr->ifr_mtu >
(ifv->ifv_p->if_mtu - ifv->ifv_mtufudge) ||
(PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) ||
ifr->ifr_mtu <
(ifv->ifv_mintu - ifv->ifv_mtufudge))
error = EINVAL;
@ -985,15 +1329,10 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
error = EINVAL;
break;
}
VLAN_LOCK();
error = vlan_config(ifv, p);
if (error) {
VLAN_UNLOCK();
error = vlan_config(ifv, p, vlr.vlr_tag);
if (error)
break;
}
ifv->ifv_tag = vlr.vlr_tag;
ifp->if_drv_flags |= IFF_DRV_RUNNING;
VLAN_UNLOCK();
/* Update flags on the parent, if necessary. */
vlan_setflags(ifp, 1);
@ -1002,8 +1341,8 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
case SIOCGETVLAN:
bzero(&vlr, sizeof(vlr));
VLAN_LOCK();
if (ifv->ifv_p) {
strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname,
if (TRUNK(ifv) != NULL) {
strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname,
sizeof(vlr.vlr_parent));
vlr.vlr_tag = ifv->ifv_tag;
}
@ -1016,16 +1355,20 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
* We should propagate selected flags to the parent,
* e.g., promiscuous mode.
*/
if (ifv->ifv_p != NULL)
if (TRUNK(ifv) != NULL)
error = vlan_setflags(ifp, 1);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/*VLAN_LOCK();*/
error = vlan_setmulti(ifp);
/*VLAN_UNLOCK();*/
/*
* If we don't have a parent, just remember the membership for
* when we do.
*/
if (TRUNK(ifv) != NULL)
error = vlan_setmulti(ifp);
break;
default:
error = EINVAL;
}

14
sys/net/if_vlan_var.h
View File

@ -93,8 +93,6 @@ struct vlanreq {
* Note that a driver must indicate it supports hardware VLAN
* tagging by marking IFCAP_VLAN_HWTAGGING in if_capabilities.
*/
#define MTAG_VLAN 1035328035
#define MTAG_VLAN_TAG 0 /* tag of VLAN interface */
/*
* This macro must expand to a lvalue so that it can be used
@ -103,9 +101,8 @@ struct vlanreq {
#define VLAN_TAG_VALUE(_mt) (*(u_int *)((_mt) + 1))
#define VLAN_INPUT_TAG(_ifp, _m, _t) do { \
struct m_tag *mtag; \
mtag = m_tag_alloc(MTAG_VLAN, MTAG_VLAN_TAG, \
sizeof (u_int), M_NOWAIT); \
struct m_tag *mtag = (struct m_tag *) \
uma_zalloc(zone_mtag_vlan, M_NOWAIT); \
if (mtag != NULL) { \
VLAN_TAG_VALUE(mtag) = (_t); \
m_tag_prepend((_m), mtag); \
@ -120,6 +117,13 @@ struct vlanreq {
#define VLAN_OUTPUT_TAG(_ifp, _m) \
((_m)->m_flags & M_VLANTAG ? \
m_tag_locate((_m), MTAG_VLAN, MTAG_VLAN_TAG, NULL) : NULL)
#define VLAN_CAPABILITIES(_ifp) do { \
if ((_ifp)->if_vlantrunk != NULL) \
(*vlan_trunk_cap_p)(_ifp); \
} while (0)
extern void (*vlan_trunk_cap_p)(struct ifnet *);
#endif /* _KERNEL */
#endif /* _NET_IF_VLAN_VAR_H_ */

5
sys/sys/mbuf.h
View File

@ -337,6 +337,7 @@ extern uma_zone_t zone_jumbo4;
extern uma_zone_t zone_jumbo9;
extern uma_zone_t zone_jumbo16;
extern uma_zone_t zone_ext_refcnt;
extern uma_zone_t zone_mtag_vlan;
static __inline struct mbuf *m_get(int how, short type);
static __inline struct mbuf *m_gethdr(int how, short type);
@ -760,6 +761,10 @@ struct mbuf *m_uiotombuf(struct uio *, int, int, int);
#define PACKET_TAG_IPOPTIONS 27 /* Saved IP options */
#define PACKET_TAG_CARP 28 /* CARP info */
/* Specific cookies and tags. */
#define MTAG_VLAN 1035328035
#define MTAG_VLAN_TAG 0 /* tag of VLAN interface */
/* Packet tag routines. */
struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
void m_tag_delete(struct mbuf *, struct m_tag *);