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usb: gadget: f_sourcesink: Support maxburst configurability for bulk endpoints

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Add support to configure maxburst via configfs for bulk endpoints.
Update gadget documentation describing the new configfs property.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
Link: https://patch.msgid.link/20251227145224.2091397-1-krishna.kurapati@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krishna Kurapati 2025-12-27 20:22:24 +05:30 • committed by Greg Kroah-Hartman
parent 6e0e8375f2
commit 090a6c6961
3 changed files with 54 additions and 0 deletions
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1
Documentation/usb/gadget-testing.rst
View file

@ -687,6 +687,7 @@ The SOURCESINK function provides these attributes in its function directory:
isoc_mult 0..2 (hs/ss only)
isoc_maxburst 0..15 (ss only)
bulk_buflen buffer length
bulk_maxburst 0..15 (ss only)
bulk_qlen depth of queue for bulk
iso_qlen depth of queue for iso
=============== ==================================

52
drivers/usb/gadget/function/f_sourcesink.c
View file

@ -46,6 +46,7 @@ struct f_sourcesink {
unsigned isoc_mult;
unsigned isoc_maxburst;
unsigned buflen;
unsigned bulk_maxburst;
unsigned bulk_qlen;
unsigned iso_qlen;
};
@ -328,6 +329,12 @@ sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
source_sink_intf_alt0.bInterfaceNumber = id;
source_sink_intf_alt1.bInterfaceNumber = id;
if (ss->bulk_maxburst > 15)
ss->bulk_maxburst = 15;
ss_source_comp_desc.bMaxBurst = ss->bulk_maxburst;
ss_sink_comp_desc.bMaxBurst = ss->bulk_maxburst;
/* allocate bulk endpoints */
ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
if (!ss->in_ep) {
@ -853,6 +860,7 @@ static struct usb_function *source_sink_alloc_func(
ss->isoc_mult = ss_opts->isoc_mult;
ss->isoc_maxburst = ss_opts->isoc_maxburst;
ss->buflen = ss_opts->bulk_buflen;
ss->bulk_maxburst = ss_opts->bulk_maxburst;
ss->bulk_qlen = ss_opts->bulk_qlen;
ss->iso_qlen = ss_opts->iso_qlen;
@ -1101,6 +1109,49 @@ end:
CONFIGFS_ATTR(f_ss_opts_, isoc_maxburst);
static ssize_t f_ss_opts_bulk_maxburst_show(struct config_item *item, char *page)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int result;
mutex_lock(&opts->lock);
result = sysfs_emit(page, "%u\n", opts->bulk_maxburst);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_ss_opts_bulk_maxburst_store(struct config_item *item,
const char *page, size_t len)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int ret;
u8 num;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtou8(page, 0, &num);
if (ret)
goto end;
if (num > 15) {
ret = -EINVAL;
goto end;
}
opts->bulk_maxburst = num;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
CONFIGFS_ATTR(f_ss_opts_, bulk_maxburst);
static ssize_t f_ss_opts_bulk_buflen_show(struct config_item *item, char *page)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
@ -1222,6 +1273,7 @@ static struct configfs_attribute *ss_attrs[] = {
&f_ss_opts_attr_isoc_mult,
&f_ss_opts_attr_isoc_maxburst,
&f_ss_opts_attr_bulk_buflen,
&f_ss_opts_attr_bulk_maxburst,
&f_ss_opts_attr_bulk_qlen,
&f_ss_opts_attr_iso_qlen,
NULL,

1
drivers/usb/gadget/function/g_zero.h
View file

@ -34,6 +34,7 @@ struct f_ss_opts {
unsigned isoc_mult;
unsigned isoc_maxburst;
unsigned bulk_buflen;
unsigned bulk_maxburst;
unsigned bulk_qlen;
unsigned iso_qlen;