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From:   Horatiu Vultur <horatiu.vultur@microchip.com>
To:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <bpf@vger.kernel.org>
CC:     <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
        <pabeni@redhat.com>, <ast@kernel.org>, <daniel@iogearbox.net>,
        <hawk@kernel.org>, <john.fastabend@gmail.com>,
        <UNGLinuxDriver@microchip.com>,
        Horatiu Vultur <horatiu.vultur@microchip.com>
Subject: [PATCH net-next v3 3/7] net: lan966x: Add len field to lan966x_tx_dcb_buf
Date:   Mon, 21 Nov 2022 22:28:46 +0100
Message-ID: <20221121212850.3212649-4-horatiu.vultur@microchip.com>
In-Reply-To: <20221121212850.3212649-1-horatiu.vultur@microchip.com>
References: <20221121212850.3212649-1-horatiu.vultur@microchip.com>
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Currently when a frame was transmitted, it is required to unamp the
frame that was transmitted. The length of the frame was taken from the
transmitted skb. In the future we might not have an skb, therefore store
the length skb directly in the lan966x_tx_dcb_buf and use this one to
unamp the frame.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c | 5 +++--
 drivers/net/ethernet/microchip/lan966x/lan966x_main.h | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
index 94c720e59caee..384ed34197d58 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
@@ -391,12 +391,12 @@ static void lan966x_fdma_tx_clear_buf(struct lan966x *lan966x, int weight)
 			continue;
 
 		dcb_buf->dev->stats.tx_packets++;
-		dcb_buf->dev->stats.tx_bytes += dcb_buf->skb->len;
+		dcb_buf->dev->stats.tx_bytes += dcb_buf->len;
 
 		dcb_buf->used = false;
 		dma_unmap_single(lan966x->dev,
 				 dcb_buf->dma_addr,
-				 dcb_buf->skb->len,
+				 dcb_buf->len,
 				 DMA_TO_DEVICE);
 		if (!dcb_buf->ptp)
 			dev_kfree_skb_any(dcb_buf->skb);
@@ -709,6 +709,7 @@ int lan966x_fdma_xmit(struct sk_buff *skb, __be32 *ifh, struct net_device *dev)
 	/* Fill up the buffer */
 	next_dcb_buf = &tx->dcbs_buf[next_to_use];
 	next_dcb_buf->skb = skb;
+	next_dcb_buf->len = skb->len;
 	next_dcb_buf->dma_addr = dma_addr;
 	next_dcb_buf->used = true;
 	next_dcb_buf->ptp = false;
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index bc93051aa0798..7bb9098496f60 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -175,6 +175,7 @@ struct lan966x_rx {
 struct lan966x_tx_dcb_buf {
 	struct net_device *dev;
 	struct sk_buff *skb;
+	int len;
 	dma_addr_t dma_addr;
 	bool used;
 	bool ptp;
-- 
2.38.0