linux-kernel - [PATCH net-next v2 2/3] mvpp2: sync only the received frame

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Date:   Thu, 24 Oct 2019 19:24:57 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 2/3] mvpp2: sync only the received frame

In the RX path we always sync against the maximum frame size for that pool.
Do the DMA sync and the unmap separately, so we can only sync by the
size of the received frame.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 33f327447b70..15818e1d6b04 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -2960,6 +2960,10 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
 		if (rx_status & MVPP2_RXD_ERR_SUMMARY)
 			goto err_drop_frame;
 
+		dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
+					rx_bytes + MVPP2_MH_SIZE,
+					DMA_FROM_DEVICE);
+
 		if (bm_pool->frag_size > PAGE_SIZE)
 			frag_size = 0;
 		else
@@ -2977,8 +2981,9 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
 			goto err_drop_frame;
 		}
 
-		dma_unmap_single(dev->dev.parent, dma_addr,
-				 bm_pool->buf_size, DMA_FROM_DEVICE);
+		dma_unmap_single_attrs(dev->dev.parent, dma_addr,
+				       bm_pool->buf_size, DMA_FROM_DEVICE,
+				       DMA_ATTR_SKIP_CPU_SYNC);
 
 		rcvd_pkts++;
 		rcvd_bytes += rx_bytes;
-- 
2.21.0