> On Fri, May 31, 2019 at 11:38:23AM +0200, Lorenzo Bianconi wrote: [...] > > } > > > > urb->num_sgs = max_t(int, i, urb->num_sgs); > > - urb->transfer_buffer_length = urb->num_sgs * q->buf_size, > > + urb->transfer_buffer_length = urb->num_sgs * data_size; > > sg_init_marker(urb->sg, urb->num_sgs); > > > > return i ? : -ENOMEM; > > @@ -611,8 +611,12 @@ static int mt76u_alloc_rx(struct mt76_dev *dev) > > if (!q->entry) > > return -ENOMEM; > > > > - q->buf_size = dev->usb.sg_en ? MT_RX_BUF_SIZE : PAGE_SIZE; > > + if (dev->usb.sg_en) > > + q->buf_size = MT_BUF_WITH_OVERHEAD(MT_RX_BUF_SIZE); > > I strongly recommend to not doing this. While this should work > in theory creating buffer with size of 2k + some bytes might > trigger various bugs in dma mapping or other low level code. even in practice actually :) but we can be more cautious since probably copying the first 128B will not make any difference > > And skb_shered_info is needed only in first buffer IIUC. > > Also this patch seems to make first patch unnecessary except for > non sg_en case (in which I think rx AMSDU is broken anyway), > so I would prefer just to apply first patch. I do not think rx AMSDU is broken for non sg_en case since the max rx value allowed should be 3839 IIRC and we alloc one page in this case Regards, Lorenzo > > Stanislaw >
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