1 files changed, 254 insertions, 0 deletions

diff --git a/drivers/net/mlx4/cq.c b/drivers/net/mlx4/cq.c
new file mode 100644
index 00000000000..437d78ad091
--- /dev/null
+++ b/drivers/net/mlx4/cq.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/init.h>
+#include <linux/hardirq.h>
+
+#include <linux/mlx4/cmd.h>
+
+#include "mlx4.h"
+#include "icm.h"
+
+struct mlx4_cq_context {
+        __be32                  flags;
+        u16                     reserved1[3];
+        __be16                  page_offset;
+        __be32                  logsize_usrpage;
+        u8                      reserved2;
+        u8                      cq_period;
+        u8                      reserved3;
+        u8                      cq_max_count;
+        u8                      reserved4[3];
+        u8                      comp_eqn;
+        u8                      log_page_size;
+        u8                      reserved5[2];
+        u8                      mtt_base_addr_h;
+        __be32                  mtt_base_addr_l;
+        __be32                  last_notified_index;
+        __be32                  solicit_producer_index;
+        __be32                  consumer_index;
+        __be32                  producer_index;
+        u8                      reserved6[2];
+        __be64                  db_rec_addr;
+};
+
+#define MLX4_CQ_STATUS_OK               ( 0 << 28)
+#define MLX4_CQ_STATUS_OVERFLOW         ( 9 << 28)
+#define MLX4_CQ_STATUS_WRITE_FAIL       (10 << 28)
+#define MLX4_CQ_FLAG_CC                 ( 1 << 18)
+#define MLX4_CQ_FLAG_OI                 ( 1 << 17)
+#define MLX4_CQ_STATE_ARMED             ( 9 <<  8)
+#define MLX4_CQ_STATE_ARMED_SOL         ( 6 <<  8)
+#define MLX4_EQ_STATE_FIRED             (10 <<  8)
+
+void mlx4_cq_completion(struct mlx4_dev *dev, u32 cqn)
+{
+        struct mlx4_cq *cq;
+
+        cq = radix_tree_lookup(&mlx4_priv(dev)->cq_table.tree,
+                               cqn & (dev->caps.num_cqs - 1));
+        if (!cq) {
+                mlx4_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
+                return;
+        }
+
+        ++cq->arm_sn;
+
+        cq->comp(cq);
+}
+
+void mlx4_cq_event(struct mlx4_dev *dev, u32 cqn, int event_type)
+{
+        struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
+        struct mlx4_cq *cq;
+
+        spin_lock(&cq_table->lock);
+
+        cq = radix_tree_lookup(&cq_table->tree, cqn & (dev->caps.num_cqs - 1));
+        if (cq)
+                atomic_inc(&cq->refcount);
+
+        spin_unlock(&cq_table->lock);
+
+        if (!cq) {
+                mlx4_warn(dev, "Async event for bogus CQ %08x\n", cqn);
+                return;
+        }
+
+        cq->event(cq, event_type);
+
+        if (atomic_dec_and_test(&cq->refcount))
+                complete(&cq->free);
+}
+
+static int mlx4_SW2HW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                         int cq_num)
+{
+        return mlx4_cmd(dev, mailbox->dma, cq_num, 0, MLX4_CMD_SW2HW_CQ,
+                        MLX4_CMD_TIME_CLASS_A);
+}
+
+static int mlx4_HW2SW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
+                         int cq_num)
+{
+        return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, cq_num,
+                            mailbox ? 0 : 1, MLX4_CMD_HW2SW_CQ,
+                            MLX4_CMD_TIME_CLASS_A);
+}
+
+int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt,
+                  struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_cq_table *cq_table = &priv->cq_table;
+        struct mlx4_cmd_mailbox *mailbox;
+        struct mlx4_cq_context *cq_context;
+        u64 mtt_addr;
+        int err;
+
+        cq->cqn = mlx4_bitmap_alloc(&cq_table->bitmap);
+        if (cq->cqn == -1)
+                return -ENOMEM;
+
+        err = mlx4_table_get(dev, &cq_table->table, cq->cqn);
+        if (err)
+                goto err_out;
+
+        err = mlx4_table_get(dev, &cq_table->cmpt_table, cq->cqn);
+        if (err)
+                goto err_put;
+
+        spin_lock_irq(&cq_table->lock);
+        err = radix_tree_insert(&cq_table->tree, cq->cqn, cq);
+        spin_unlock_irq(&cq_table->lock);
+        if (err)
+                goto err_cmpt_put;
+
+        mailbox = mlx4_alloc_cmd_mailbox(dev);
+        if (IS_ERR(mailbox)) {
+                err = PTR_ERR(mailbox);
+                goto err_radix;
+        }
+
+        cq_context = mailbox->buf;
+        memset(cq_context, 0, sizeof *cq_context);
+
+        cq_context->logsize_usrpage = cpu_to_be32((ilog2(nent) << 24) | uar->index);
+        cq_context->comp_eqn        = priv->eq_table.eq[MLX4_EQ_COMP].eqn;
+        cq_context->log_page_size   = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
+
+        mtt_addr = mlx4_mtt_addr(dev, mtt);
+        cq_context->mtt_base_addr_h = mtt_addr >> 32;
+        cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
+        cq_context->db_rec_addr     = cpu_to_be64(db_rec);
+
+        err = mlx4_SW2HW_CQ(dev, mailbox, cq->cqn);
+        mlx4_free_cmd_mailbox(dev, mailbox);
+        if (err)
+                goto err_radix;
+
+        cq->cons_index = 0;
+        cq->arm_sn     = 1;
+        cq->uar        = uar;
+        atomic_set(&cq->refcount, 1);
+        init_completion(&cq->free);
+
+        return 0;
+
+err_radix:
+        spin_lock_irq(&cq_table->lock);
+        radix_tree_delete(&cq_table->tree, cq->cqn);
+        spin_unlock_irq(&cq_table->lock);
+
+err_cmpt_put:
+        mlx4_table_put(dev, &cq_table->cmpt_table, cq->cqn);
+
+err_put:
+        mlx4_table_put(dev, &cq_table->table, cq->cqn);
+
+err_out:
+        mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_cq_alloc);
+
+void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq)
+{
+        struct mlx4_priv *priv = mlx4_priv(dev);
+        struct mlx4_cq_table *cq_table = &priv->cq_table;
+        int err;
+
+        err = mlx4_HW2SW_CQ(dev, NULL, cq->cqn);
+        if (err)
+                mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn);
+
+        synchronize_irq(priv->eq_table.eq[MLX4_EQ_COMP].irq);
+
+        spin_lock_irq(&cq_table->lock);
+        radix_tree_delete(&cq_table->tree, cq->cqn);
+        spin_unlock_irq(&cq_table->lock);
+
+        if (atomic_dec_and_test(&cq->refcount))
+                complete(&cq->free);
+        wait_for_completion(&cq->free);
+
+        mlx4_table_put(dev, &cq_table->table, cq->cqn);
+        mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
+}
+EXPORT_SYMBOL_GPL(mlx4_cq_free);
+
+int __devinit mlx4_init_cq_table(struct mlx4_dev *dev)
+{
+        struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
+        int err;
+
+        spin_lock_init(&cq_table->lock);
+        INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);
+
+        err = mlx4_bitmap_init(&cq_table->bitmap, dev->caps.num_cqs,
+                               dev->caps.num_cqs - 1, dev->caps.reserved_cqs);
+        if (err)
+                return err;
+
+        return 0;
+}
+
+void mlx4_cleanup_cq_table(struct mlx4_dev *dev)
+{
+        /* Nothing to do to clean up radix_tree */
+        mlx4_bitmap_cleanup(&mlx4_priv(dev)->cq_table.bitmap);
+}