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Date: Thu, 10 Mar 2022 15:28:56 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
kernel@...gutronix.de, Peter Fink <pfink@...ist-es.de>,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 22/29] can: gs_usb: use union and FLEX_ARRAY for data in struct gs_host_frame
From: Peter Fink <pfink@...ist-es.de>
Modify struct gs_host_frame to make use of a union and
DECLARE_FLEX_ARRAY to be able to store different data (lengths), which
will be added in later commits.
Store the gs_host_frame length in TX direction (host -> device) in
struct gs_can::hf_size_tx and RX direction (device -> host) in struct
gs_usb::hf_size_rx so it must be calculated only once.
Link: https://lore.kernel.org/all/20220309124132.291861-15-mkl@pengutronix.de
Signed-off-by: Peter Fink <pfink@...ist-es.de>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
drivers/net/can/usb/gs_usb.c | 37 +++++++++++++++++++++++++-----------
1 file changed, 26 insertions(+), 11 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 4bc10264005b..1fe9d9f08c17 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -146,6 +146,10 @@ struct gs_device_bt_const {
#define GS_CAN_FLAG_OVERFLOW BIT(0)
+struct classic_can {
+ u8 data[8];
+} __packed;
+
struct gs_host_frame {
u32 echo_id;
__le32 can_id;
@@ -155,7 +159,9 @@ struct gs_host_frame {
u8 flags;
u8 reserved;
- u8 data[8];
+ union {
+ DECLARE_FLEX_ARRAY(struct classic_can, classic_can);
+ };
} __packed;
/* The GS USB devices make use of the same flags and masks as in
* linux/can.h and linux/can/error.h, and no additional mapping is necessary.
@@ -187,6 +193,8 @@ struct gs_can {
struct can_bittiming_const bt_const;
unsigned int channel; /* channel number */
+ unsigned int hf_size_tx;
+
/* This lock prevents a race condition between xmit and receive. */
spinlock_t tx_ctx_lock;
struct gs_tx_context tx_context[GS_MAX_TX_URBS];
@@ -200,6 +208,7 @@ struct gs_usb {
struct gs_can *canch[GS_MAX_INTF];
struct usb_anchor rx_submitted;
struct usb_device *udev;
+ unsigned int hf_size_rx;
u8 active_channels;
};
@@ -343,7 +352,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
cf->can_id = le32_to_cpu(hf->can_id);
can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode);
- memcpy(cf->data, hf->data, 8);
+ memcpy(cf->data, hf->classic_can->data, 8);
/* ERROR frames tell us information about the controller */
if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
@@ -398,7 +407,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
resubmit_urb:
usb_fill_bulk_urb(urb, usbcan->udev,
usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
- hf, sizeof(struct gs_host_frame),
+ hf, dev->parent->hf_size_rx,
gs_usb_receive_bulk_callback, usbcan);
rc = usb_submit_urb(urb, GFP_ATOMIC);
@@ -485,7 +494,7 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
if (!urb)
goto nomem_urb;
- hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
+ hf = usb_alloc_coherent(dev->udev, dev->hf_size_tx, GFP_ATOMIC,
&urb->transfer_dma);
if (!hf) {
netdev_err(netdev, "No memory left for USB buffer\n");
@@ -509,11 +518,11 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
hf->can_id = cpu_to_le32(cf->can_id);
hf->can_dlc = can_get_cc_dlc(cf, dev->can.ctrlmode);
- memcpy(hf->data, cf->data, cf->len);
+ memcpy(hf->classic_can->data, cf->data, cf->len);
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
- hf, sizeof(*hf),
+ hf, dev->hf_size_tx,
gs_usb_xmit_callback, txc);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
@@ -531,8 +540,8 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
gs_free_tx_context(txc);
usb_unanchor_urb(urb);
- usb_free_coherent(dev->udev,
- sizeof(*hf), hf, urb->transfer_dma);
+ usb_free_coherent(dev->udev, urb->transfer_buffer_length,
+ urb->transfer_buffer, urb->transfer_dma);
if (rc == -ENODEV) {
netif_device_detach(netdev);
@@ -552,7 +561,8 @@ static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
badidx:
- usb_free_coherent(dev->udev, sizeof(*hf), hf, urb->transfer_dma);
+ usb_free_coherent(dev->udev, urb->transfer_buffer_length,
+ urb->transfer_buffer, urb->transfer_dma);
nomem_hf:
usb_free_urb(urb);
@@ -569,6 +579,7 @@ static int gs_can_open(struct net_device *netdev)
struct gs_usb *parent = dev->parent;
int rc, i;
struct gs_device_mode *dm;
+ struct gs_host_frame *hf;
u32 ctrlmode;
u32 flags = 0;
@@ -576,6 +587,8 @@ static int gs_can_open(struct net_device *netdev)
if (rc)
return rc;
+ dev->hf_size_tx = struct_size(hf, classic_can, 1);
+
if (!parent->active_channels) {
for (i = 0; i < GS_MAX_RX_URBS; i++) {
struct urb *urb;
@@ -588,7 +601,7 @@ static int gs_can_open(struct net_device *netdev)
/* alloc rx buffer */
buf = usb_alloc_coherent(dev->udev,
- sizeof(struct gs_host_frame),
+ dev->parent->hf_size_rx,
GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
@@ -604,7 +617,7 @@ static int gs_can_open(struct net_device *netdev)
usb_rcvbulkpipe(dev->udev,
GSUSB_ENDPOINT_IN),
buf,
- sizeof(struct gs_host_frame),
+ dev->parent->hf_size_rx,
gs_usb_receive_bulk_callback, parent);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
@@ -886,6 +899,7 @@ static int gs_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(intf);
+ struct gs_host_frame *hf;
struct gs_usb *dev;
int rc = -ENOMEM;
unsigned int icount, i;
@@ -947,6 +961,7 @@ static int gs_usb_probe(struct usb_interface *intf,
}
init_usb_anchor(&dev->rx_submitted);
+ dev->hf_size_rx = struct_size(hf, classic_can, 1);
usb_set_intfdata(intf, dev);
dev->udev = udev;
--
2.35.1
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