From 1650113888fe7b7e16604a5019c32dd3ddeb3af2 Mon Sep 17 00:00:00 2001 From: Jussi Kivilinna Date: Fri, 12 Aug 2016 17:28:05 +0300 Subject: [PATCH] usb: gadget: f_ncm: add SuperSpeed descriptors for CDC NCM Patch enables SuperSpeed for NCM gadget. Tested with USB3380 and measured TCP throughput with two Intel PCs: udc to host: 920 Mbit/s host to udc: 550 Mbit/s Signed-off-by: Jussi Kivilinna Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_ncm.c | 82 ++++++++++++++++++++++++++++++++++++- 1 file changed, 80 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c index 97f0a9b..08cff49 100644 --- a/drivers/usb/gadget/function/f_ncm.c +++ b/drivers/usb/gadget/function/f_ncm.c @@ -90,7 +90,9 @@ static inline struct f_ncm *func_to_ncm(struct usb_function *f) /* peak (theoretical) bulk transfer rate in bits-per-second */ static inline unsigned ncm_bitrate(struct usb_gadget *g) { - if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) + if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER) + return 13 * 1024 * 8 * 1000 * 8; + else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) return 13 * 512 * 8 * 1000 * 8; else return 19 * 64 * 1 * 1000 * 8; @@ -333,6 +335,76 @@ static struct usb_descriptor_header *ncm_hs_function[] = { NULL, }; + +/* super speed support: */ + +static struct usb_endpoint_descriptor ss_ncm_notify_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_INT, + .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT), + .bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS) +}; + +static struct usb_ss_ep_comp_descriptor ss_ncm_notify_comp_desc = { + .bLength = sizeof(ss_ncm_notify_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /* the following 3 values can be tweaked if necessary */ + /* .bMaxBurst = 0, */ + /* .bmAttributes = 0, */ + .wBytesPerInterval = cpu_to_le16(NCM_STATUS_BYTECOUNT), +}; + +static struct usb_endpoint_descriptor ss_ncm_in_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; + +static struct usb_endpoint_descriptor ss_ncm_out_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; + +static struct usb_ss_ep_comp_descriptor ss_ncm_bulk_comp_desc = { + .bLength = sizeof(ss_ncm_bulk_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /* the following 2 values can be tweaked if necessary */ + /* .bMaxBurst = 0, */ + /* .bmAttributes = 0, */ +}; + +static struct usb_descriptor_header *ncm_ss_function[] = { + (struct usb_descriptor_header *) &ncm_iad_desc, + /* CDC NCM control descriptors */ + (struct usb_descriptor_header *) &ncm_control_intf, + (struct usb_descriptor_header *) &ncm_header_desc, + (struct usb_descriptor_header *) &ncm_union_desc, + (struct usb_descriptor_header *) &ecm_desc, + (struct usb_descriptor_header *) &ncm_desc, + (struct usb_descriptor_header *) &ss_ncm_notify_desc, + (struct usb_descriptor_header *) &ss_ncm_notify_comp_desc, + /* data interface, altsettings 0 and 1 */ + (struct usb_descriptor_header *) &ncm_data_nop_intf, + (struct usb_descriptor_header *) &ncm_data_intf, + (struct usb_descriptor_header *) &ss_ncm_in_desc, + (struct usb_descriptor_header *) &ss_ncm_bulk_comp_desc, + (struct usb_descriptor_header *) &ss_ncm_out_desc, + (struct usb_descriptor_header *) &ss_ncm_bulk_comp_desc, + NULL, +}; + /* string descriptors: */ #define STRING_CTRL_IDX 0 @@ -1431,8 +1503,13 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f) hs_ncm_notify_desc.bEndpointAddress = fs_ncm_notify_desc.bEndpointAddress; + ss_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress; + ss_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress; + ss_ncm_notify_desc.bEndpointAddress = + fs_ncm_notify_desc.bEndpointAddress; + status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function, - NULL, NULL); + ncm_ss_function, NULL); if (status) goto fail; @@ -1450,6 +1527,7 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f) ncm->task_timer.function = ncm_tx_timeout; DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n", + gadget_is_superspeed(c->cdev->gadget) ? "super" : gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", ncm->port.in_ep->name, ncm->port.out_ep->name, ncm->notify->name); -- 2.7.4