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usb: add short-packet handling to usb-storage driver

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The dwc-hsotg (dwc2) USB host depends on a short packet to
indicate the end of an IN transfer. The usb-storage driver
currently doesn't provide this, so fix it.

I have tested this change rather extensively using a PC
emulation with xhci, ehci, and uhci controllers, and have
not observed any regressions.

Signed-off-by: Paul Zimmerman <pauldzim@gmail.com>
Message-id: 20200520235349.21215-6-pauldzim@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Paul Zimmerman 2020-05-20 16:53:47 -07:00 committed by Peter Maydell
parent 153ef1662c
commit 7ad3d51ebb
1 changed files with 14 additions and 1 deletions
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15
hw/usb/dev-storage.c
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@ -229,6 +229,9 @@ static void usb_msd_copy_data(MSDState *s, USBPacket *p)
usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len);
s->scsi_len -= len;
s->scsi_off += len;
if (len > s->data_len) {
len = s->data_len;
}
s->data_len -= len;
if (s->scsi_len == 0 || s->data_len == 0) {
scsi_req_continue(s->req);
@ -303,6 +306,9 @@ static void usb_msd_command_complete(SCSIRequest *req, uint32_t status, size_t r
if (s->data_len) {
int len = (p->iov.size - p->actual_length);
usb_packet_skip(p, len);
if (len > s->data_len) {
len = s->data_len;
}
s->data_len -= len;
}
if (s->data_len == 0) {
@ -469,6 +475,9 @@ static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
int len = p->iov.size - p->actual_length;
if (len) {
usb_packet_skip(p, len);
if (len > s->data_len) {
len = s->data_len;
}
s->data_len -= len;
if (s->data_len == 0) {
s->mode = USB_MSDM_CSW;
@ -528,13 +537,17 @@ static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
int len = p->iov.size - p->actual_length;
if (len) {
usb_packet_skip(p, len);
if (len > s->data_len) {
len = s->data_len;
}
s->data_len -= len;
if (s->data_len == 0) {
s->mode = USB_MSDM_CSW;
}
}
}
if (p->actual_length < p->iov.size) {
if (p->actual_length < p->iov.size && (p->short_not_ok ||
s->scsi_len >= p->ep->max_packet_size)) {
DPRINTF("Deferring packet %p [wait data-in]\n", p);
s->packet = p;
p->status = USB_RET_ASYNC;