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r8152: limit the RX buffer size of RTL8153A for USB 2.0

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If the USB host controller is EHCI, the throughput is reduced from
300Mb/s to 60Mb/s, when the rx buffer size is modified from 16K to
32K.

According to the EHCI spec, the maximum size of the qTD is 20K.
Therefore, when the driver uses more than 20K buffer, the latency
time of EHCI would be increased. And, it let the RTL8153A get worse
throughput.

However, the driver uses alloc_pages() for rx buffer, so I limit
the rx buffer to 16K rather than 20K.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=205923
Fixes: ec5791c202 ("r8152: separate the rx buffer size")
Reported-by: Robert Davies <robdavies1977@gmail.com>
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hayes Wang 2021-03-19 15:37:21 +08:00 committed by David S. Miller
parent 8a2dc6af67
commit f91a50d8b5
1 changed files with 4 additions and 1 deletions
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5
drivers/net/usb/r8152.c
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@ -6553,7 +6553,10 @@ static int rtl_ops_init(struct r8152 *tp)
ops->in_nway = rtl8153_in_nway;
ops->hw_phy_cfg = r8153_hw_phy_cfg;
ops->autosuspend_en = rtl8153_runtime_enable;
tp->rx_buf_sz = 32 * 1024;
if (tp->udev->speed < USB_SPEED_SUPER)
tp->rx_buf_sz = 16 * 1024;
else
tp->rx_buf_sz = 32 * 1024;
tp->eee_en = true;
tp->eee_adv = MDIO_EEE_1000T | MDIO_EEE_100TX;
break;