Messages in this thread Patch in this message | | | From | Macpaul Lin <> | Subject | [PATCH 2/2] usb: gadget: u_serial: improve performance for large data | Date | Tue, 16 Jun 2020 20:34:44 +0800 |
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If the hardware (like DMA engine) could support large usb request exceeds maximum packet size, use larger buffer when performing Rx/Tx could reduce request numbers and improve performance.
Signed-off-by: Macpaul Lin <macpaul.lin@mediatek.com> --- drivers/usb/gadget/function/u_serial.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c index 3cfc6e2..cdcc070 100644 --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -80,6 +80,8 @@ #define QUEUE_SIZE 16 #define WRITE_BUF_SIZE 8192 /* TX only */ #define GS_CONSOLE_BUF_SIZE 8192 +/* for hardware can do more than max packet */ +#define REQ_BUF_SIZE 4096 /* console info */ struct gs_console { @@ -247,7 +249,8 @@ static int gs_start_tx(struct gs_port *port) break; req = list_entry(pool->next, struct usb_request, list); - len = gs_send_packet(port, req->buf, in->maxpacket); + len = gs_send_packet(port, req->buf, in->can_exceed_maxp ? + REQ_BUF_SIZE : in->maxpacket); if (len == 0) { wake_up_interruptible(&port->drain_wait); break; @@ -514,7 +517,9 @@ static int gs_alloc_requests(struct usb_ep *ep, struct list_head *head, * be as speedy as we might otherwise be. */ for (i = 0; i < n; i++) { - req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC); + req = gs_alloc_req(ep, ep->can_exceed_maxp ? + REQ_BUF_SIZE : ep->maxpacket, + GFP_ATOMIC); if (!req) return list_empty(head) ? -ENOMEM : 0; req->complete = fn; -- 1.7.9.5 | |