aggr_send.c revision 0dc2366f7b9f9f36e10909b1e95edbf2a261c2ac
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* IEEE 802.3ad Link Aggregation - Send code.
*
* Implements the Distributor function.
*/
#include <sys/conf.h>
#include <sys/modctl.h>
#include <sys/sunddi.h>
#include <sys/callb.h>
#include <sys/vlan.h>
#include <sys/strsun.h>
#include <sys/strsubr.h>
#include <sys/dlpi.h>
#include <inet/common.h>
#include <inet/led.h>
#include <inet/ip.h>
#include <inet/ip6.h>
#include <inet/tcp.h>
#include <netinet/udp.h>
#include <sys/aggr.h>
#include <sys/aggr_impl.h>
/*
* Update the TX load balancing policy of the specified group.
*/
void
aggr_send_update_policy(aggr_grp_t *grp, uint32_t policy)
{
uint8_t mac_policy = 0;
ASSERT(MAC_PERIM_HELD(grp->lg_mh));
if ((policy & AGGR_POLICY_L2) != 0)
mac_policy |= MAC_PKT_HASH_L2;
if ((policy & AGGR_POLICY_L3) != 0)
mac_policy |= MAC_PKT_HASH_L3;
if ((policy & AGGR_POLICY_L4) != 0)
mac_policy |= MAC_PKT_HASH_L4;
grp->lg_tx_policy = policy;
grp->lg_mac_tx_policy = mac_policy;
}
#define HASH_HINT(hint) \
((hint) ^ ((hint) >> 24) ^ ((hint) >> 16) ^ ((hint) >> 8))
/*
* Function invoked by mac layer to find a specific TX ring on a port
* to send data.
*/
mblk_t *
aggr_find_tx_ring(void *arg, mblk_t *mp, uintptr_t hint, mac_ring_handle_t *rh)
{
aggr_grp_t *grp = arg;
aggr_port_t *port;
uint64_t hash;
rw_enter(&grp->lg_tx_lock, RW_READER);
if (grp->lg_ntx_ports == 0) {
/*
* We could have returned from aggr_m_start() before
* the ports were actually attached. Drop the chain.
*/
rw_exit(&grp->lg_tx_lock);
freemsgchain(mp);
return (NULL);
}
hash = mac_pkt_hash(DL_ETHER, mp, grp->lg_mac_tx_policy, B_TRUE);
port = grp->lg_tx_ports[hash % grp->lg_ntx_ports];
/*
* Use hash as the hint so to direct traffic to
* different TX rings. Note below bit operation
* is needed in case hint is 0 to get the most
* benefit from HASH_HINT() algorithm.
*/
if (port->lp_tx_ring_cnt > 1) {
if (hint == 0) {
hash = (hash << 24 | hash << 16 | hash);
hash = (hash << 32 | hash);
} else {
hash = hint;
}
hash = HASH_HINT(hash);
*rh = port->lp_pseudo_tx_rings[hash % port->lp_tx_ring_cnt];
} else {
*rh = port->lp_pseudo_tx_rings[0];
}
rw_exit(&grp->lg_tx_lock);
return (mp);
}
/*
* aggr_tx_notify_thread:
*
* aggr_tx_ring_update() callback function wakes up this thread when
* it gets called. This thread will call mac_tx_ring_update() to
* notify upper mac of flow control getting relieved. Note that
* aggr_tx_ring_update() cannot call mac_tx_ring_update() directly
* because aggr_tx_ring_update() is called from lower mac with
* mi_rw_lock held.
*/
void
aggr_tx_notify_thread(void *arg)
{
callb_cpr_t cprinfo;
aggr_grp_t *grp = (aggr_grp_t *)arg;
mac_ring_handle_t pseudo_mrh;
CALLB_CPR_INIT(&cprinfo, &grp->lg_tx_flowctl_lock, callb_generic_cpr,
"aggr_tx_notify_thread");
mutex_enter(&grp->lg_tx_flowctl_lock);
while (!grp->lg_tx_notify_done) {
if ((grp->lg_tx_blocked_cnt) == 0) {
CALLB_CPR_SAFE_BEGIN(&cprinfo);
cv_wait(&grp->lg_tx_flowctl_cv,
&grp->lg_tx_flowctl_lock);
CALLB_CPR_SAFE_END(&cprinfo, &grp->lg_tx_flowctl_lock);
continue;
}
while (grp->lg_tx_blocked_cnt != 0) {
grp->lg_tx_blocked_cnt--;
pseudo_mrh =
grp->lg_tx_blocked_rings[grp->lg_tx_blocked_cnt];
mutex_exit(&grp->lg_tx_flowctl_lock);
mac_tx_ring_update(grp->lg_mh, pseudo_mrh);
mutex_enter(&grp->lg_tx_flowctl_lock);
}
}
/*
* The grp is being destroyed, exit the thread.
*/
grp->lg_tx_notify_thread = NULL;
CALLB_CPR_EXIT(&cprinfo);
thread_exit();
}
/*
* Callback function registered with lower mac to receive wakeups from
* drivers when flow control is relieved (i.e. Tx descriptors are
* available).
*/
void
aggr_tx_ring_update(void *arg1, uintptr_t arg2)
{
aggr_port_t *port = (aggr_port_t *)arg1;
mac_ring_handle_t mrh = (mac_ring_handle_t)arg2;
mac_ring_handle_t pseudo_mrh;
aggr_grp_t *grp = port->lp_grp;
int i = 0;
if (mrh == NULL) {
/*
* If the underlying NIC does not expose TX rings,
* still as pseudo TX ring is presented to the
* aggr mac.
*/
pseudo_mrh = port->lp_pseudo_tx_rings[0];
} else {
for (i = 0; i < port->lp_tx_ring_cnt; i++) {
if (port->lp_tx_rings[i] == mrh)
break;
}
ASSERT(i < port->lp_tx_ring_cnt);
pseudo_mrh = port->lp_pseudo_tx_rings[i];
}
mutex_enter(&grp->lg_tx_flowctl_lock);
/*
* It could be possible that some (broken?) device driver
* could send more than one wakeup on the same ring. In
* such a case, multiple instances of the same pseudo TX
* ring should not be saved in lg_tx_blocked_rings[]
* array. So first check if woken up ring (pseudo_mrh) is
* already in the lg_tx_blocked_rings[] array.
*/
for (i = 0; i < grp->lg_tx_blocked_cnt; i++) {
if (grp->lg_tx_blocked_rings[i] == pseudo_mrh) {
mutex_exit(&grp->lg_tx_flowctl_lock);
return;
}
}
/* A distinct mac_ring_handle. Save and increment count */
grp->lg_tx_blocked_rings[grp->lg_tx_blocked_cnt] = pseudo_mrh;
grp->lg_tx_blocked_cnt++;
cv_signal(&grp->lg_tx_flowctl_cv);
mutex_exit(&grp->lg_tx_flowctl_lock);
}
/*
* Send function invoked by the MAC service module.
*/
mblk_t *
aggr_ring_tx(void *arg, mblk_t *mp)
{
aggr_pseudo_tx_ring_t *pseudo_ring = (aggr_pseudo_tx_ring_t *)arg;
aggr_port_t *port = pseudo_ring->atr_port;
return (mac_hwring_send_priv(port->lp_mch, pseudo_ring->atr_hw_rh, mp));
}
/*
* Enable sending on the specified port.
*/
void
aggr_send_port_enable(aggr_port_t *port)
{
aggr_grp_t *grp = port->lp_grp;
ASSERT(MAC_PERIM_HELD(grp->lg_mh));
if (port->lp_tx_enabled || (port->lp_state !=
AGGR_PORT_STATE_ATTACHED)) {
/* already enabled or port not yet attached */
return;
}
/*
* Add to group's array of tx ports.
*/
rw_enter(&grp->lg_tx_lock, RW_WRITER);
if (grp->lg_tx_ports_size < grp->lg_ntx_ports+1) {
/* current array too small */
aggr_port_t **new_ports;
uint_t new_size;
new_size = grp->lg_ntx_ports+1;
new_ports = kmem_zalloc(new_size * sizeof (aggr_port_t *),
KM_SLEEP);
if (grp->lg_tx_ports_size > 0) {
ASSERT(grp->lg_tx_ports != NULL);
bcopy(grp->lg_tx_ports, new_ports,
grp->lg_ntx_ports * sizeof (aggr_port_t *));
kmem_free(grp->lg_tx_ports,
grp->lg_tx_ports_size * sizeof (aggr_port_t *));
}
grp->lg_tx_ports = new_ports;
grp->lg_tx_ports_size = new_size;
}
grp->lg_tx_ports[grp->lg_ntx_ports++] = port;
port->lp_tx_idx = grp->lg_ntx_ports-1;
rw_exit(&grp->lg_tx_lock);
port->lp_tx_enabled = B_TRUE;
}
/*
* Disable sending from the specified port.
*/
void
aggr_send_port_disable(aggr_port_t *port)
{
uint_t idx, ntx;
aggr_grp_t *grp = port->lp_grp;
ASSERT(MAC_PERIM_HELD(grp->lg_mh));
ASSERT(MAC_PERIM_HELD(port->lp_mh));
if (!port->lp_tx_enabled) {
/* not yet enabled */
return;
}
rw_enter(&grp->lg_tx_lock, RW_WRITER);
idx = port->lp_tx_idx;
ntx = grp->lg_ntx_ports;
ASSERT(idx < ntx);
/* remove from array of attached ports */
if (idx == (ntx - 1)) {
grp->lg_tx_ports[idx] = NULL;
} else {
/* not the last entry, replace with last one */
aggr_port_t *victim;
victim = grp->lg_tx_ports[ntx - 1];
grp->lg_tx_ports[ntx - 1] = NULL;
victim->lp_tx_idx = idx;
grp->lg_tx_ports[idx] = victim;
}
port->lp_tx_idx = 0;
grp->lg_ntx_ports--;
rw_exit(&grp->lg_tx_lock);
port->lp_tx_enabled = B_FALSE;
}