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usb: chipidea: udc: limit usb request length to max 16KB

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To let the device controller work properly on short packet limitations,
one usb request should only correspond to one dTD. Then every dTD will
set IOC. In theory, each dTD support up to 20KB data transfer if the
offset is 0. Due to we cannot predetermine the offset, this will limit
the usb request length to max 16KB. This should be fine since most of
the user transfer data based on this size policy.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20240923081203.2851768-2-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2024-09-23 16:12:02 +08:00 committed by Greg Kroah-Hartman
parent ec841b8d73
commit ca8d18aa7b
2 changed files with 7 additions and 0 deletions
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1
drivers/usb/chipidea/ci.h
View File

@ -25,6 +25,7 @@
#define TD_PAGE_COUNT 5
#define CI_HDRC_PAGE_SIZE 4096ul /* page size for TD's */
#define ENDPT_MAX 32
#define CI_MAX_REQ_SIZE (4 * CI_HDRC_PAGE_SIZE)
#define CI_MAX_BUF_SIZE (TD_PAGE_COUNT * CI_HDRC_PAGE_SIZE)
/******************************************************************************

6
drivers/usb/chipidea/udc.c
View File

@ -960,6 +960,12 @@ static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
return -EMSGSIZE;
}
if (ci->has_short_pkt_limit &&
hwreq->req.length > CI_MAX_REQ_SIZE) {
dev_err(hwep->ci->dev, "request length too big (max 16KB)\n");
return -EMSGSIZE;
}
/* first nuke then test link, e.g. previous status has not sent */
if (!list_empty(&hwreq->queue)) {
dev_err(hwep->ci->dev, "request already in queue\n");