netdev - [RFC net-next 2/2] mvpp2: memory accounting

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Date:   Tue, 24 Dec 2019 02:01:03 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Tomislav Tomasic <tomislav.tomasic@...tura.hr>,
        Marcin Wojtas <mw@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Nadav Haklai <nadavh@...vell.com>
Subject: [RFC net-next 2/2] mvpp2: memory accounting

Use the XDP API for memory accounting.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2.h    |  3 ++
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 31 ++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
index 67b3bf0d3c8b..ffd633e0a3be 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
@@ -1165,6 +1165,9 @@ struct mvpp2_rx_queue {
 
 	/* Port's logic RXQ number to which physical RXQ is mapped */
 	int logic_rxq;
+
+	/* XDP memory accounting */
+	struct xdp_rxq_info xdp_rxq;
 };
 
 struct mvpp2_bm_pool {
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 4edb81c8941f..3b0aac66ac52 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2405,10 +2405,11 @@ static int mvpp2_aggr_txq_init(struct platform_device *pdev,
 /* Create a specified Rx queue */
 static int mvpp2_rxq_init(struct mvpp2_port *port,
 			  struct mvpp2_rx_queue *rxq)
-
 {
+	struct mvpp2 *priv = port->priv;
 	unsigned int thread;
 	u32 rxq_dma;
+	int err;
 
 	rxq->size = port->rx_ring_size;
 
@@ -2446,7 +2447,35 @@ static int mvpp2_rxq_init(struct mvpp2_port *port,
 	/* Add number of descriptors ready for receiving packets */
 	mvpp2_rxq_status_update(port, rxq->id, 0, rxq->size);
 
+	err = xdp_rxq_info_reg(&rxq->xdp_rxq, port->dev, rxq->id);
+	if (err < 0)
+		goto err_free_dma;
+
+	if (priv->percpu_pools) {
+		/* Every RXQ has a pool for short and another for long packets */
+		err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq,
+						 MEM_TYPE_PAGE_POOL,
+						 priv->page_pool[rxq->logic_rxq]);
+		if (err < 0)
+			goto err_unregister_rxq;
+
+		err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq,
+						 MEM_TYPE_PAGE_POOL,
+						 priv->page_pool[rxq->logic_rxq +
+								 port->nrxqs]);
+		if (err < 0)
+			goto err_unregister_rxq;
+	}
+
 	return 0;
+
+err_unregister_rxq:
+	xdp_rxq_info_unreg(&rxq->xdp_rxq);
+err_free_dma:
+	dma_free_coherent(port->dev->dev.parent,
+			  rxq->size * MVPP2_DESC_ALIGNED_SIZE,
+			  rxq->descs, rxq->descs_dma);
+	return err;
 }
 
 /* Push packets received by the RXQ to BM pool */
-- 
2.24.1