Commit 871578c9 authored by Bjørn Mork's avatar Bjørn Mork Committed by David S. Miller
Browse files

net: cdc_ncm: export NCM Transfer Block (NTB) parameters 



The mandatory GetNtbParameters control request is an important part of
the host <-> device protocol negotiation in CDC NCM (and CDC MBIM). It
gives device limits which the host must obey when configuring the
protocol aggregation variables. The driver will enforce this by
rejecting attempts to set any of the tunable variables to a value
which is not supported by the device.  Exporting the parameter block
helps userspace decide which values are allowed without resorting
to trial and error.

Signed-off-by: default avatarBjørn Mork <bjorn@mork.no>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e368d27f

drivers/net/usb/cdc_ncm.c

+30 −0
Original line number Diff line number Diff line
@@ -260,10 +260,40 @@ static DEVICE_ATTR(rx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_rx_max, cdc_ncm_store 
static DEVICE_ATTR(tx_max, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);

static DEVICE_ATTR(tx_timer_usecs, S_IRUGO | S_IWUSR, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);



#define NCM_PARM_ATTR(name, format, tocpu)				\

static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \

{ \

	struct usbnet *dev = netdev_priv(to_net_dev(d)); \

	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \

	return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name));	\

} \

static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)



NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);

NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);

NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);

NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);

NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);

NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);

NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);

NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);

NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);

NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);



static struct attribute *cdc_ncm_sysfs_attrs[] = {

	&dev_attr_rx_max.attr,

	&dev_attr_tx_max.attr,

	&dev_attr_tx_timer_usecs.attr,

	&dev_attr_bmNtbFormatsSupported.attr,

	&dev_attr_dwNtbInMaxSize.attr,

	&dev_attr_wNdpInDivisor.attr,

	&dev_attr_wNdpInPayloadRemainder.attr,

	&dev_attr_wNdpInAlignment.attr,

	&dev_attr_dwNtbOutMaxSize.attr,

	&dev_attr_wNdpOutDivisor.attr,

	&dev_attr_wNdpOutPayloadRemainder.attr,

	&dev_attr_wNdpOutAlignment.attr,

	&dev_attr_wNtbOutMaxDatagrams.attr,

	NULL,

};

CRA Git | Maintained and supported by SUSTech CRA and CCSE