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net: cdc_ncm: split out rx_max/tx_max update of setup 

Split out the part of setup dealing with updating the rx_max
and tx_max buffer sizes so that this code can be reused for
dynamically updating the limits.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork 2014-05-16 21:48:18 +02:00 committed by David S. Miller
parent 97dc48e220
commit 5aa73d5d72
1 changed files with 57 additions and 31 deletions
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88
drivers/net/usb/cdc_ncm.c
View File

@ -65,6 +65,61 @@ static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
static struct usb_driver cdc_ncm_driver; static struct usb_driver cdc_ncm_driver;
/* handle rx_max and tx_max changes */
static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
{
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
u32 val, max, min;
/* clamp new_rx to sane values */
min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
/* dwNtbInMaxSize spec violation? Use MIN size for both limits */
if (max < min) {
dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
max = min;
}
val = clamp_t(u32, new_rx, min, max);
if (val != new_rx) {
dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range. Using %u\n",
min, max, val);
}
/* inform device about NTB input size changes */
if (val != ctx->rx_max) {
__le32 dwNtbInMaxSize = cpu_to_le32(val);
dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, &dwNtbInMaxSize, 4) < 0)
dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
else
ctx->rx_max = val;
}
/* clamp new_tx to sane values */
min = CDC_NCM_MIN_HDR_SIZE + ctx->max_datagram_size;
max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
/* some devices set dwNtbOutMaxSize too low for the above default */
min = min(min, max);
val = clamp_t(u32, new_tx, min, max);
if (val != new_tx) {
dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range. Using %u\n",
min, max, val);
}
if (val != ctx->tx_max)
dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
ctx->tx_max = val;
}
static int cdc_ncm_setup(struct usbnet *dev) static int cdc_ncm_setup(struct usbnet *dev)
{ {
struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
@ -132,37 +187,8 @@ static int cdc_ncm_setup(struct usbnet *dev)
(ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
/* verify maximum size of received NTB in bytes */ /* clamp rx_max and tx_max and inform device */
if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) { cdc_ncm_update_rxtx_max(dev, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
dev_dbg(&dev->intf->dev, "Using min receive length=%d\n",
USB_CDC_NCM_NTB_MIN_IN_SIZE);
ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE;
}
if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) {
dev_dbg(&dev->intf->dev, "Using default maximum receive length=%d\n",
CDC_NCM_NTB_MAX_SIZE_RX);
ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX;
}
/* inform device about NTB input size changes */
if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) {
__le32 dwNtbInMaxSize = cpu_to_le32(ctx->rx_max);
err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
USB_TYPE_CLASS | USB_DIR_OUT
| USB_RECIP_INTERFACE,
0, iface_no, &dwNtbInMaxSize, 4);
if (err < 0)
dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
}
/* verify maximum size of transmitted NTB in bytes */
if (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX) {
dev_dbg(&dev->intf->dev, "Using default maximum transmit length=%d\n",
CDC_NCM_NTB_MAX_SIZE_TX);
ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
}
/* /*
* verify that the structure alignment is: * verify that the structure alignment is: