mlx4_core: Add QP range reservation support

To allow allocating an aligned range of consecutive QP numbers, add an
interface to reserve an aligned range of QP numbers and have the QP
allocation function always take a QP number.

This will be used for RSS support in the mlx4_en Ethernet driver and
also potentially by IPoIB RSS support.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

4 files changed, 125 insertions, 17 deletions

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index baa01deb2436..39167a797f99 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -451,6 +451,7 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
                             struct ib_qp_init_attr *init_attr,
                             struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
 {
+        int qpn;
         int err;
 
         mutex_init(&qp->mutex);
@@ -545,9 +546,17 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
                 }
         }
 
-        err = mlx4_qp_alloc(dev->dev, sqpn, &qp->mqp);
+        if (sqpn) {
+                qpn = sqpn;
+        } else {
+                err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
+                if (err)
+                        goto err_wrid;
+        }
+
+        err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
         if (err)
-                goto err_wrid;
+                goto err_qpn;
 
         /*
          * Hardware wants QPN written in big-endian order (after
@@ -560,6 +569,10 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
 
         return 0;
 
+err_qpn:
+        if (!sqpn)
+                mlx4_qp_release_range(dev->dev, qpn, 1);
+
 err_wrid:
         if (pd->uobject) {
                 if (!init_attr->srq)
@@ -655,6 +668,10 @@ static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
         mlx4_ib_unlock_cqs(send_cq, recv_cq);
 
         mlx4_qp_free(dev->dev, &qp->mqp);
+
+        if (!is_sqp(dev, qp))
+                mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
+
         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 
         if (is_user) {
diff --git a/drivers/net/mlx4/alloc.c b/drivers/net/mlx4/alloc.c
index 096bca54bcf7..e6c0d5bb5dcb 100644
--- a/drivers/net/mlx4/alloc.c
+++ b/drivers/net/mlx4/alloc.c
@@ -65,10 +65,82 @@ u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap)
 
 void mlx4_bitmap_free(struct mlx4_bitmap *bitmap, u32 obj)
 {
+        mlx4_bitmap_free_range(bitmap, obj, 1);
+}
+
+static unsigned long find_aligned_range(unsigned long *bitmap,
+                                        u32 start, u32 nbits,
+                                        int len, int align)
+{
+        unsigned long end, i;
+
+again:
+        start = ALIGN(start, align);
+
+        while ((start < nbits) && test_bit(start, bitmap))
+                start += align;
+
+        if (start >= nbits)
+                return -1;
+
+        end = start+len;
+        if (end > nbits)
+                return -1;
+
+        for (i = start + 1; i < end; i++) {
+                if (test_bit(i, bitmap)) {
+                        start = i + 1;
+                        goto again;
+                }
+        }
+
+        return start;
+}
+
+u32 mlx4_bitmap_alloc_range(struct mlx4_bitmap *bitmap, int cnt, int align)
+{
+        u32 obj, i;
+
+        if (likely(cnt == 1 && align == 1))
+                return mlx4_bitmap_alloc(bitmap);
+
+        spin_lock(&bitmap->lock);
+
+        obj = find_aligned_range(bitmap->table, bitmap->last,
+                                 bitmap->max, cnt, align);
+        if (obj >= bitmap->max) {
+                bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask;
+                obj = find_aligned_range(bitmap->table, 0,
+                                         bitmap->max,
+                                         cnt, align);
+        }
+
+        if (obj < bitmap->max) {
+                for (i = 0; i < cnt; i++)
+                        set_bit(obj + i, bitmap->table);
+                if (obj == bitmap->last) {
+                        bitmap->last = (obj + cnt);
+                        if (bitmap->last >= bitmap->max)
+                                bitmap->last = 0;
+                }
+                obj |= bitmap->top;
+        } else
+                obj = -1;
+
+        spin_unlock(&bitmap->lock);
+
+        return obj;
+}
+
+void mlx4_bitmap_free_range(struct mlx4_bitmap *bitmap, u32 obj, int cnt)
+{
+        u32 i;
+
         obj &= bitmap->max - 1;
 
         spin_lock(&bitmap->lock);
-        clear_bit(obj, bitmap->table);
+        for (i = 0; i < cnt; i++)
+                clear_bit(obj + i, bitmap->table);
         bitmap->last = min(bitmap->last, obj);
         bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask;
         spin_unlock(&bitmap->lock);
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index 5337e3ac3e78..b55ddab73f66 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -288,6 +288,8 @@ static inline struct mlx4_priv *mlx4_priv(struct mlx4_dev *dev)
 
 u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap);
 void mlx4_bitmap_free(struct mlx4_bitmap *bitmap, u32 obj);
+u32 mlx4_bitmap_alloc_range(struct mlx4_bitmap *bitmap, int cnt, int align);
+void mlx4_bitmap_free_range(struct mlx4_bitmap *bitmap, u32 obj, int cnt);
 int mlx4_bitmap_init(struct mlx4_bitmap *bitmap, u32 num, u32 mask, u32 reserved);
 void mlx4_bitmap_cleanup(struct mlx4_bitmap *bitmap);
 
diff --git a/drivers/net/mlx4/qp.c b/drivers/net/mlx4/qp.c
index c49a86044bf7..98e0c40ba368 100644
--- a/drivers/net/mlx4/qp.c
+++ b/drivers/net/mlx4/qp.c
@@ -147,19 +147,42 @@ int mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_modify);
 
-int mlx4_qp_alloc(struct mlx4_dev *dev, int sqpn, struct mlx4_qp *qp)
+int mlx4_qp_reserve_range(struct mlx4_dev *dev, int cnt, int align, int *base)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_qp_table *qp_table = &priv->qp_table;
+        int qpn;
+
+        qpn = mlx4_bitmap_alloc_range(&qp_table->bitmap, cnt, align);
+        if (qpn == -1)
+                return -ENOMEM;
+
+        *base = qpn;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_qp_reserve_range);
+
+void mlx4_qp_release_range(struct mlx4_dev *dev, int base_qpn, int cnt)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_qp_table *qp_table = &priv->qp_table;
+        if (base_qpn < dev->caps.sqp_start + 8)
+                return;
+
+        mlx4_bitmap_free_range(&qp_table->bitmap, base_qpn, cnt);
+}
+EXPORT_SYMBOL_GPL(mlx4_qp_release_range);
+
+int mlx4_qp_alloc(struct mlx4_dev *dev, int qpn, struct mlx4_qp *qp)
 {
         struct mlx4_priv *priv = mlx4_priv(dev);
         struct mlx4_qp_table *qp_table = &priv->qp_table;
         int err;
 
-        if (sqpn)
-                qp->qpn = sqpn;
-        else {
-                qp->qpn = mlx4_bitmap_alloc(&qp_table->bitmap);
-                if (qp->qpn == -1)
-                        return -ENOMEM;
-        }
+        if (!qpn)
+                return -EINVAL;
+
+        qp->qpn = qpn;
 
         err = mlx4_table_get(dev, &qp_table->qp_table, qp->qpn);
         if (err)
@@ -208,9 +231,6 @@ err_put_qp:
         mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);
 
 err_out:
-        if (!sqpn)
-                mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
-
         return err;
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_alloc);
@@ -239,9 +259,6 @@ void mlx4_qp_free(struct mlx4_dev *dev, struct mlx4_qp *qp)
         mlx4_table_put(dev, &qp_table->altc_table, qp->qpn);
         mlx4_table_put(dev, &qp_table->auxc_table, qp->qpn);
         mlx4_table_put(dev, &qp_table->qp_table, qp->qpn);
-
-        if (qp->qpn >= dev->caps.sqp_start + 8)
-                mlx4_bitmap_free(&qp_table->bitmap, qp->qpn);
 }
 EXPORT_SYMBOL_GPL(mlx4_qp_free);