linux-kernel - [PATCH rdma-next v2 04/11] RDMA/core: Add FRMR pools statistics

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Message-ID: <20251222-frmr_pools-v2-4-f06a99caa538@nvidia.com>
Date: Mon, 22 Dec 2025 14:40:39 +0200
From: Edward Srouji <edwards@...dia.com>
To: Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>, "Saeed
 Mahameed" <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<netdev@...r.kernel.org>, Michael Guralnik <michaelgur@...dia.com>, "Edward
 Srouji" <edwards@...dia.com>, Yishai Hadas <yishaih@...dia.com>
Subject: [PATCH rdma-next v2 04/11] RDMA/core: Add FRMR pools statistics

From: Michael Guralnik <michaelgur@...dia.com>

Count for each pool the number of FRMR handles popped and held by user
MRs.
Also keep track of the max value of this counter.

Next patches will expose the statistics through netlink.

Signed-off-by: Michael Guralnik <michaelgur@...dia.com>
Reviewed-by: Yishai Hadas <yishaih@...dia.com>
Signed-off-by: Edward Srouji <edwards@...dia.com>
---
 drivers/infiniband/core/frmr_pools.c | 12 ++++++++++--
 drivers/infiniband/core/frmr_pools.h |  3 +++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/frmr_pools.c b/drivers/infiniband/core/frmr_pools.c
index 406664a6e209..9af2f6aa6c06 100644
--- a/drivers/infiniband/core/frmr_pools.c
+++ b/drivers/infiniband/core/frmr_pools.c
@@ -319,19 +319,24 @@ static int get_frmr_from_pool(struct ib_device *device,
 		if (pool->inactive_queue.ci > 0) {
 			handle = pop_handle_from_queue_locked(
 				&pool->inactive_queue);
-			spin_unlock(&pool->lock);
 		} else {
 			spin_unlock(&pool->lock);
 			err = pools->pool_ops->create_frmrs(device, &pool->key,
 							    &handle, 1);
 			if (err)
 				return err;
+			spin_lock(&pool->lock);
 		}
 	} else {
 		handle = pop_handle_from_queue_locked(&pool->queue);
-		spin_unlock(&pool->lock);
 	}
 
+	pool->in_use++;
+	if (pool->in_use > pool->max_in_use)
+		pool->max_in_use = pool->in_use;
+
+	spin_unlock(&pool->lock);
+
 	mr->frmr.pool = pool;
 	mr->frmr.handle = handle;
 
@@ -383,6 +388,9 @@ int ib_frmr_pool_push(struct ib_device *device, struct ib_mr *mr)
 	if (pool->queue.ci == 0)
 		schedule_aging = true;
 	ret = push_handle_to_queue_locked(&pool->queue, mr->frmr.handle);
+	if (ret == 0)
+		pool->in_use--;
+
 	spin_unlock(&pool->lock);
 
 	if (ret == 0 && schedule_aging)
diff --git a/drivers/infiniband/core/frmr_pools.h b/drivers/infiniband/core/frmr_pools.h
index a20323e03e3f..814d8a2106c2 100644
--- a/drivers/infiniband/core/frmr_pools.h
+++ b/drivers/infiniband/core/frmr_pools.h
@@ -42,6 +42,9 @@ struct ib_frmr_pool {
 
 	struct delayed_work aging_work;
 	struct ib_device *device;
+
+	u32 max_in_use;
+	u32 in_use;
 };
 
 struct ib_frmr_pools {

-- 
2.49.0