cxgb4: add support for per queue tx scheduling
Add support to bind/unbind specified tx queues to/from scheduling
classes. If a queue is already bound to a scheduling class, it is
unbound first and then bound to a new specified class.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
index 6158daf..539de76 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
@@ -67,6 +67,312 @@
return err;
}
+/* Spinlock must be held by caller */
+static int t4_sched_bind_unbind_op(struct port_info *pi, void *arg,
+ enum sched_bind_type type, bool bind)
+{
+ struct adapter *adap = pi->adapter;
+ u32 fw_mnem, fw_class, fw_param;
+ unsigned int pf = adap->pf;
+ unsigned int vf = 0;
+ int err = 0;
+
+ switch (type) {
+ case SCHED_QUEUE: {
+ struct sched_queue_entry *qe;
+
+ qe = (struct sched_queue_entry *)arg;
+
+ /* Create a template for the FW_PARAMS_CMD mnemonic and
+ * value (TX Scheduling Class in this case).
+ */
+ fw_mnem = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_DMAQ) |
+ FW_PARAMS_PARAM_X_V(
+ FW_PARAMS_PARAM_DMAQ_EQ_SCHEDCLASS_ETH));
+ fw_class = bind ? qe->param.class : FW_SCHED_CLS_NONE;
+ fw_param = (fw_mnem | FW_PARAMS_PARAM_YZ_V(qe->cntxt_id));
+
+ pf = adap->pf;
+ vf = 0;
+ break;
+ }
+ default:
+ err = -ENOTSUPP;
+ goto out;
+ }
+
+ err = t4_set_params(adap, adap->mbox, pf, vf, 1, &fw_param, &fw_class);
+
+out:
+ return err;
+}
+
+static struct sched_class *t4_sched_queue_lookup(struct port_info *pi,
+ const unsigned int qid,
+ int *index)
+{
+ struct sched_table *s = pi->sched_tbl;
+ struct sched_class *e, *end;
+ struct sched_class *found = NULL;
+ int i;
+
+ /* Look for a class with matching bound queue parameters */
+ end = &s->tab[s->sched_size];
+ for (e = &s->tab[0]; e != end; ++e) {
+ struct sched_queue_entry *qe;
+
+ i = 0;
+ if (e->state == SCHED_STATE_UNUSED)
+ continue;
+
+ list_for_each_entry(qe, &e->queue_list, list) {
+ if (qe->cntxt_id == qid) {
+ found = e;
+ if (index)
+ *index = i;
+ break;
+ }
+ i++;
+ }
+
+ if (found)
+ break;
+ }
+
+ return found;
+}
+
+static int t4_sched_queue_unbind(struct port_info *pi, struct ch_sched_queue *p)
+{
+ struct adapter *adap = pi->adapter;
+ struct sched_class *e;
+ struct sched_queue_entry *qe = NULL;
+ struct sge_eth_txq *txq;
+ unsigned int qid;
+ int index = -1;
+ int err = 0;
+
+ if (p->queue < 0 || p->queue >= pi->nqsets)
+ return -ERANGE;
+
+ txq = &adap->sge.ethtxq[pi->first_qset + p->queue];
+ qid = txq->q.cntxt_id;
+
+ /* Find the existing class that the queue is bound to */
+ e = t4_sched_queue_lookup(pi, qid, &index);
+ if (e && index >= 0) {
+ int i = 0;
+
+ spin_lock(&e->lock);
+ list_for_each_entry(qe, &e->queue_list, list) {
+ if (i == index)
+ break;
+ i++;
+ }
+ err = t4_sched_bind_unbind_op(pi, (void *)qe, SCHED_QUEUE,
+ false);
+ if (err) {
+ spin_unlock(&e->lock);
+ goto out;
+ }
+
+ list_del(&qe->list);
+ t4_free_mem(qe);
+ if (atomic_dec_and_test(&e->refcnt)) {
+ e->state = SCHED_STATE_UNUSED;
+ memset(&e->info, 0, sizeof(e->info));
+ }
+ spin_unlock(&e->lock);
+ }
+out:
+ return err;
+}
+
+static int t4_sched_queue_bind(struct port_info *pi, struct ch_sched_queue *p)
+{
+ struct adapter *adap = pi->adapter;
+ struct sched_table *s = pi->sched_tbl;
+ struct sched_class *e;
+ struct sched_queue_entry *qe = NULL;
+ struct sge_eth_txq *txq;
+ unsigned int qid;
+ int err = 0;
+
+ if (p->queue < 0 || p->queue >= pi->nqsets)
+ return -ERANGE;
+
+ qe = t4_alloc_mem(sizeof(struct sched_queue_entry));
+ if (!qe)
+ return -ENOMEM;
+
+ txq = &adap->sge.ethtxq[pi->first_qset + p->queue];
+ qid = txq->q.cntxt_id;
+
+ /* Unbind queue from any existing class */
+ err = t4_sched_queue_unbind(pi, p);
+ if (err)
+ goto out;
+
+ /* Bind queue to specified class */
+ memset(qe, 0, sizeof(*qe));
+ qe->cntxt_id = qid;
+ memcpy(&qe->param, p, sizeof(qe->param));
+
+ e = &s->tab[qe->param.class];
+ spin_lock(&e->lock);
+ err = t4_sched_bind_unbind_op(pi, (void *)qe, SCHED_QUEUE, true);
+ if (err) {
+ t4_free_mem(qe);
+ spin_unlock(&e->lock);
+ goto out;
+ }
+
+ list_add_tail(&qe->list, &e->queue_list);
+ atomic_inc(&e->refcnt);
+ spin_unlock(&e->lock);
+out:
+ return err;
+}
+
+static void t4_sched_class_unbind_all(struct port_info *pi,
+ struct sched_class *e,
+ enum sched_bind_type type)
+{
+ if (!e)
+ return;
+
+ switch (type) {
+ case SCHED_QUEUE: {
+ struct sched_queue_entry *qe;
+
+ list_for_each_entry(qe, &e->queue_list, list)
+ t4_sched_queue_unbind(pi, &qe->param);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static int t4_sched_class_bind_unbind_op(struct port_info *pi, void *arg,
+ enum sched_bind_type type, bool bind)
+{
+ int err = 0;
+
+ if (!arg)
+ return -EINVAL;
+
+ switch (type) {
+ case SCHED_QUEUE: {
+ struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
+
+ if (bind)
+ err = t4_sched_queue_bind(pi, qe);
+ else
+ err = t4_sched_queue_unbind(pi, qe);
+ break;
+ }
+ default:
+ err = -ENOTSUPP;
+ break;
+ }
+
+ return err;
+}
+
+/**
+ * cxgb4_sched_class_bind - Bind an entity to a scheduling class
+ * @dev: net_device pointer
+ * @arg: Entity opaque data
+ * @type: Entity type (Queue)
+ *
+ * Binds an entity (queue) to a scheduling class. If the entity
+ * is bound to another class, it will be unbound from the other class
+ * and bound to the class specified in @arg.
+ */
+int cxgb4_sched_class_bind(struct net_device *dev, void *arg,
+ enum sched_bind_type type)
+{
+ struct port_info *pi = netdev2pinfo(dev);
+ struct sched_table *s;
+ int err = 0;
+ u8 class_id;
+
+ if (!can_sched(dev))
+ return -ENOTSUPP;
+
+ if (!arg)
+ return -EINVAL;
+
+ switch (type) {
+ case SCHED_QUEUE: {
+ struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
+
+ class_id = qe->class;
+ break;
+ }
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (!valid_class_id(dev, class_id))
+ return -EINVAL;
+
+ if (class_id == SCHED_CLS_NONE)
+ return -ENOTSUPP;
+
+ s = pi->sched_tbl;
+ write_lock(&s->rw_lock);
+ err = t4_sched_class_bind_unbind_op(pi, arg, type, true);
+ write_unlock(&s->rw_lock);
+
+ return err;
+}
+
+/**
+ * cxgb4_sched_class_unbind - Unbind an entity from a scheduling class
+ * @dev: net_device pointer
+ * @arg: Entity opaque data
+ * @type: Entity type (Queue)
+ *
+ * Unbinds an entity (queue) from a scheduling class.
+ */
+int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
+ enum sched_bind_type type)
+{
+ struct port_info *pi = netdev2pinfo(dev);
+ struct sched_table *s;
+ int err = 0;
+ u8 class_id;
+
+ if (!can_sched(dev))
+ return -ENOTSUPP;
+
+ if (!arg)
+ return -EINVAL;
+
+ switch (type) {
+ case SCHED_QUEUE: {
+ struct ch_sched_queue *qe = (struct ch_sched_queue *)arg;
+
+ class_id = qe->class;
+ break;
+ }
+ default:
+ return -ENOTSUPP;
+ }
+
+ if (!valid_class_id(dev, class_id))
+ return -EINVAL;
+
+ s = pi->sched_tbl;
+ write_lock(&s->rw_lock);
+ err = t4_sched_class_bind_unbind_op(pi, arg, type, false);
+ write_unlock(&s->rw_lock);
+
+ return err;
+}
+
/* If @p is NULL, fetch any available unused class */
static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
const struct ch_sched_params *p)
@@ -199,6 +505,11 @@
return t4_sched_class_alloc(pi, p);
}
+static void t4_sched_class_free(struct port_info *pi, struct sched_class *e)
+{
+ t4_sched_class_unbind_all(pi, e, SCHED_QUEUE);
+}
+
struct sched_table *t4_init_sched(unsigned int sched_size)
{
struct sched_table *s;
@@ -215,6 +526,7 @@
memset(&s->tab[i], 0, sizeof(struct sched_class));
s->tab[i].idx = i;
s->tab[i].state = SCHED_STATE_UNUSED;
+ INIT_LIST_HEAD(&s->tab[i].queue_list);
spin_lock_init(&s->tab[i].lock);
atomic_set(&s->tab[i].refcnt, 0);
}
@@ -230,6 +542,15 @@
struct port_info *pi = netdev2pinfo(adap->port[i]);
s = pi->sched_tbl;
+ for (i = 0; i < s->sched_size; i++) {
+ struct sched_class *e;
+
+ write_lock(&s->rw_lock);
+ e = &s->tab[i];
+ if (e->state == SCHED_STATE_ACTIVE)
+ t4_sched_class_free(pi, e);
+ write_unlock(&s->rw_lock);
+ }
t4_free_mem(s);
}
}