From d704d16f201ab75d9e348ab932b76d2c924fd472 Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi Date: Tue, 12 Feb 2019 14:42:40 +0100 Subject: [PATCH] mt76: usb: do not use sg buffers for mcu messages Do not use scatter-gather buffers for mcu commands. Introduce mt76u_buf_alloc and mt76u_buf_alloc_sg routines. Signed-off-by: Lorenzo Bianconi Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mt76.h | 3 +- .../wireless/mediatek/mt76/mt76x02_usb_mcu.c | 3 +- drivers/net/wireless/mediatek/mt76/usb.c | 38 +++++++++++++++---- drivers/net/wireless/mediatek/mt76/usb_mcu.c | 5 +-- 4 files changed, 36 insertions(+), 13 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 0eb9152c5d18..f55dc621e060 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -87,6 +87,7 @@ struct mt76u_buf { struct mt76_dev *dev; struct urb *urb; size_t len; + void *buf; bool done; }; @@ -748,7 +749,7 @@ void mt76u_single_wr(struct mt76_dev *dev, const u8 req, int mt76u_init(struct mt76_dev *dev, struct usb_interface *intf); void mt76u_deinit(struct mt76_dev *dev); int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf *buf, - int nsgs, int len, int sglen, gfp_t gfp); + int len, int data_len, gfp_t gfp); void mt76u_buf_free(struct mt76u_buf *buf); int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index, struct mt76u_buf *buf, gfp_t gfp, diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c index 64c777298cee..e469e383cb88 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c @@ -63,9 +63,9 @@ static int mt76x02u_mcu_wait_resp(struct mt76_dev *dev, u8 seq) struct mt76_usb *usb = &dev->usb; struct mt76u_buf *buf = &usb->mcu.res; struct urb *urb = buf->urb; + u8 *data = buf->buf; int i, ret; u32 rxfce; - u8 *data; for (i = 0; i < 5; i++) { if (!wait_for_completion_timeout(&usb->mcu.cmpl, @@ -75,7 +75,6 @@ static int mt76x02u_mcu_wait_resp(struct mt76_dev *dev, u8 seq) if (urb->status) return -EIO; - data = sg_virt(&urb->sg[0]); if (usb->mcu.rp) mt76x02u_multiple_mcu_reads(dev, data + 4, urb->actual_length - 8); diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c index 78b31b9ba8ad..e32ec89781c6 100644 --- a/drivers/net/wireless/mediatek/mt76/usb.c +++ b/drivers/net/wireless/mediatek/mt76/usb.c @@ -319,8 +319,9 @@ mt76u_fill_rx_sg(struct mt76_dev *dev, struct mt76u_buf *buf, return i ? : -ENOMEM; } -int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf *buf, - int nsgs, int len, int sglen, gfp_t gfp) +static int +mt76u_buf_alloc_sg(struct mt76_dev *dev, struct mt76u_buf *buf, + int nsgs, int len, int sglen, gfp_t gfp) { buf->urb = usb_alloc_urb(0, gfp); if (!buf->urb) @@ -337,6 +338,25 @@ int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf *buf, return mt76u_fill_rx_sg(dev, buf, nsgs, len, sglen); } +int mt76u_buf_alloc(struct mt76_dev *dev, struct mt76u_buf *buf, + int len, int data_len, gfp_t gfp) +{ + struct mt76_queue *q = &dev->q_rx[MT_RXQ_MAIN]; + + buf->urb = usb_alloc_urb(0, gfp); + if (!buf->urb) + return -ENOMEM; + + buf->buf = page_frag_alloc(&q->rx_page, len, gfp); + if (!buf->buf) + return -ENOMEM; + + buf->len = data_len; + buf->dev = dev; + + return 0; +} + void mt76u_buf_free(struct mt76u_buf *buf) { struct urb *urb = buf->urb; @@ -350,6 +370,9 @@ void mt76u_buf_free(struct mt76u_buf *buf) skb_free_frag(sg_virt(sg)); } + if (buf->buf) + skb_free_frag(buf->buf); + usb_free_urb(buf->urb); } EXPORT_SYMBOL_GPL(mt76u_buf_free); @@ -360,6 +383,7 @@ int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index, { struct usb_interface *intf = to_usb_interface(dev->dev); struct usb_device *udev = interface_to_usbdev(intf); + u8 *data = buf->urb->num_sgs ? NULL : buf->buf; unsigned int pipe; if (dir == USB_DIR_IN) @@ -367,7 +391,7 @@ int mt76u_submit_buf(struct mt76_dev *dev, int dir, int index, else pipe = usb_sndbulkpipe(udev, dev->usb.out_ep[index]); - usb_fill_bulk_urb(buf->urb, udev, pipe, NULL, buf->len, + usb_fill_bulk_urb(buf->urb, udev, pipe, data, buf->len, complete_fn, context); trace_submit_urb(dev, buf->urb); @@ -555,10 +579,10 @@ static int mt76u_alloc_rx(struct mt76_dev *dev) q->ndesc = MT_NUM_RX_ENTRIES; for (i = 0; i < q->ndesc; i++) { - err = mt76u_buf_alloc(dev, &q->entry[i].ubuf, - nsgs, q->buf_size, - SKB_WITH_OVERHEAD(q->buf_size), - GFP_KERNEL); + err = mt76u_buf_alloc_sg(dev, &q->entry[i].ubuf, + nsgs, q->buf_size, + SKB_WITH_OVERHEAD(q->buf_size), + GFP_KERNEL); if (err < 0) return err; } diff --git a/drivers/net/wireless/mediatek/mt76/usb_mcu.c b/drivers/net/wireless/mediatek/mt76/usb_mcu.c index 9527e1216f3d..72c8607da4b4 100644 --- a/drivers/net/wireless/mediatek/mt76/usb_mcu.c +++ b/drivers/net/wireless/mediatek/mt76/usb_mcu.c @@ -29,9 +29,8 @@ int mt76u_mcu_init_rx(struct mt76_dev *dev) struct mt76_usb *usb = &dev->usb; int err; - err = mt76u_buf_alloc(dev, &usb->mcu.res, 1, - MCU_RESP_URB_SIZE, MCU_RESP_URB_SIZE, - GFP_KERNEL); + err = mt76u_buf_alloc(dev, &usb->mcu.res, MCU_RESP_URB_SIZE, + MCU_RESP_URB_SIZE, GFP_KERNEL); if (err < 0) return err;