linux-kernel - [PATCH 1/3] can: rx-offload: add CANFD support based on offload

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Message-ID: <20181219083637.641-2-qiangqing.zhang@nxp.com>
Date:   Wed, 19 Dec 2018 08:39:00 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
CC:     "wg@...ndegger.com" <wg@...ndegger.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        Joakim Zhang <qiangqing.zhang@....com>
Subject: [PATCH 1/3] can: rx-offload: add CANFD support based on offload

From: Dong Aisheng <aisheng.dong@....com>

Using struct canfd_frame instead of can_frame to add support for CAN FD
mode in offload. FlexCAN controller will set the is_canfd variable when
it supports CAN FD mode.

Signed-off-by: Dong Aisheng <aisheng.dong@....com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 drivers/net/can/rx-offload.c   | 16 ++++++++++------
 include/linux/can/rx-offload.h |  4 +++-
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/rx-offload.c b/drivers/net/can/rx-offload.c
index 2ce4fa8698c7..131fe600deb3 100644
--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -55,11 +55,11 @@ static int can_rx_offload_napi_poll(struct napi_struct *napi, int quota)
 
 	while ((work_done < quota) &&
 	       (skb = skb_dequeue(&offload->skb_queue))) {
-		struct can_frame *cf = (struct can_frame *)skb->data;
+		struct canfd_frame *cf = (struct canfd_frame *)skb->data;
 
 		work_done++;
 		stats->rx_packets++;
-		stats->rx_bytes += cf->can_dlc;
+		stats->rx_bytes += cf->len;
 		netif_receive_skb(skb);
 	}
 
@@ -122,16 +122,20 @@ static struct sk_buff *can_rx_offload_offload_one(struct can_rx_offload *offload
 {
 	struct sk_buff *skb = NULL;
 	struct can_rx_offload_cb *cb;
-	struct can_frame *cf;
+	struct canfd_frame *cf;
 	int ret;
 
 	/* If queue is full or skb not available, read to discard mailbox */
 	if (likely(skb_queue_len(&offload->skb_queue) <=
-		   offload->skb_queue_len_max))
-		skb = alloc_can_skb(offload->dev, &cf);
+		   offload->skb_queue_len_max)) {
+		if (offload->is_canfd)
+			skb = alloc_canfd_skb(offload->dev, &cf);
+		else
+			skb = alloc_can_skb(offload->dev, (struct can_frame **)&cf);
+	}
 
 	if (!skb) {
-		struct can_frame cf_overflow;
+		struct canfd_frame cf_overflow;
 		u32 timestamp;
 
 		ret = offload->mailbox_read(offload, &cf_overflow,
diff --git a/include/linux/can/rx-offload.h b/include/linux/can/rx-offload.h
index 8268811a697e..6448e7dfc170 100644
--- a/include/linux/can/rx-offload.h
+++ b/include/linux/can/rx-offload.h
@@ -23,7 +23,7 @@
 struct can_rx_offload {
 	struct net_device *dev;
 
-	unsigned int (*mailbox_read)(struct can_rx_offload *offload, struct can_frame *cf,
+	unsigned int (*mailbox_read)(struct can_rx_offload *offload, struct canfd_frame *cf,
 				     u32 *timestamp, unsigned int mb);
 
 	struct sk_buff_head skb_queue;
@@ -35,6 +35,8 @@ struct can_rx_offload {
 	struct napi_struct napi;
 
 	bool inc;
+
+	bool is_canfd;
 };
 
 int can_rx_offload_add_timestamp(struct net_device *dev, struct can_rx_offload *offload);
-- 
2.17.1