RDMA/efa: Count mmap failures

Add a new stat that counts mmap failures, which might help when debugging
different issues.

Link: https://lore.kernel.org/r/20200420062213.44577-3-galpress@amazon.com
Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/efa/efa.h b/drivers/infiniband/hw/efa/efa.h
index 45d519e..1889dd1 100644 (file)
--- a/drivers/infiniband/hw/efa/efa.h
+++ b/drivers/infiniband/hw/efa/efa.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
 /*
- * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * Copyright 2018-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
  */
 
 #ifndef _EFA_H_
@@ -40,6 +40,7 @@ struct efa_sw_stats {
        atomic64_t reg_mr_err;
        atomic64_t alloc_ucontext_err;
        atomic64_t create_ah_err;
+       atomic64_t mmap_err;
 };
 
 /* Don't use anything other than atomic64 */

diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 43cc93b..1f8162b 100644 (file)
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -44,7 +44,8 @@ struct efa_user_mmap_entry {
        op(EFA_CREATE_CQ_ERR, "create_cq_err") \
        op(EFA_REG_MR_ERR, "reg_mr_err") \
        op(EFA_ALLOC_UCONTEXT_ERR, "alloc_ucontext_err") \
-       op(EFA_CREATE_AH_ERR, "create_ah_err")
+       op(EFA_CREATE_AH_ERR, "create_ah_err") \
+       op(EFA_MMAP_ERR, "mmap_err")
 
 #define EFA_STATS_ENUM(ename, name) ename,
 #define EFA_STATS_STR(ename, name) [ename] = name,
@@ -1569,6 +1570,7 @@ static int __efa_mmap(struct efa_dev *dev, struct efa_ucontext *ucontext,
                ibdev_dbg(&dev->ibdev,
                          "pgoff[%#lx] does not have valid entry\n",
                          vma->vm_pgoff);
+               atomic64_inc(&dev->stats.sw_stats.mmap_err);
                return -EINVAL;
        }
        entry = to_emmap(rdma_entry);
@@ -1604,12 +1606,14 @@ static int __efa_mmap(struct efa_dev *dev, struct efa_ucontext *ucontext,
                err = -EINVAL;
        }
 
-       if (err)
+       if (err) {
                ibdev_dbg(
                        &dev->ibdev,
                        "Couldn't mmap address[%#llx] length[%#zx] mmap_flag[%d] err[%d]\n",
                        entry->address, rdma_entry->npages * PAGE_SIZE,
                        entry->mmap_flag, err);
+               atomic64_inc(&dev->stats.sw_stats.mmap_err);
+       }
 
        rdma_user_mmap_entry_put(rdma_entry);
        return err;
@@ -1758,6 +1762,7 @@ int efa_get_hw_stats(struct ib_device *ibdev, struct rdma_hw_stats *stats,
        stats->value[EFA_REG_MR_ERR] = atomic64_read(&s->sw_stats.reg_mr_err);
        stats->value[EFA_ALLOC_UCONTEXT_ERR] = atomic64_read(&s->sw_stats.alloc_ucontext_err);
        stats->value[EFA_CREATE_AH_ERR] = atomic64_read(&s->sw_stats.create_ah_err);
+       stats->value[EFA_MMAP_ERR] = atomic64_read(&s->sw_stats.mmap_err);
 
        return ARRAY_SIZE(efa_stats_names);
 }