linux-kernel - [PATCH rdma-next 3/9] RDMA/core: Add FRMR pools statistics

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Message-ID: <20251116-frmr_pools-v1-3-5eb3c8f5c9c4@nvidia.com>
Date: Sun, 16 Nov 2025 21:10:24 +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 3/9] 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 406664a6e2099b2a7827e12a40820ecab75cb59c..9af2f6aa6c06cee8a1157aac05aa64f361451083 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 a20323e03e3f446856dda921811e2359232e0b82..814d8a2106c2978a1a1feca3ba50420025fca994 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 {

-- 
2.47.1