target/linux/ipq806x/patches-5.10/106-5.13-net-stmmac-Set-FIFO-sizes-for-ipq806x.patch

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   5 X-Patchwork-Submitter: Jonathan McDowell <noodles@earth.li>
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  52 Date: Sat, 13 Mar 2021 13:18:26 +0000
  53 From: Jonathan McDowell <noodles@earth.li>
  54 To: Giuseppe Cavallaro <peppe.cavallaro@st.com>,
  55         Alexandre Torgue <alexandre.torgue@st.com>,
  56         Jose Abreu <joabreu@synopsys.com>,
  57         David Miller <davem@davemloft.net>,
  58         Jakub Kicinski <kuba@kernel.org>,
  59         Maxime Coquelin <mcoquelin.stm32@gmail.com>,
  60         netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
  61         linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
  62 Subject: [PATCH net-next] net: stmmac: Set FIFO sizes for ipq806x
  63 Message-ID: <20210313131826.GA17553@earth.li>
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  68 List-ID: <netdev.vger.kernel.org>
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  70 X-Patchwork-Delegate: kuba@kernel.org
  71
  72 Commit eaf4fac47807 ("net: stmmac: Do not accept invalid MTU values")
  73 started using the TX FIFO size to verify what counts as a valid MTU
  74 request for the stmmac driver.  This is unset for the ipq806x variant.
  75 Looking at older patches for this it seems the RX + TXs buffers can be
  76 up to 8k, so set appropriately.
  77
  78 (I sent this as an RFC patch in June last year, but received no replies.
  79 I've been running with this on my hardware (a MikroTik RB3011) since
  80 then with larger MTUs to support both the internal qca8k switch and
  81 VLANs with no problems. Without the patch it's impossible to set the
  82 larger MTU required to support this.)
  83
  84 Signed-off-by: Jonathan McDowell <noodles@earth.li>
  85 ---
  86  drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c | 2 ++
  87  1 file changed, 2 insertions(+)
  88
  89 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
  90 +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
  91 @@ -352,6 +352,8 @@ static int ipq806x_gmac_probe(struct pla
  92         plat_dat->bsp_priv = gmac;
  93         plat_dat->fix_mac_speed = ipq806x_gmac_fix_mac_speed;
  94         plat_dat->multicast_filter_bins = 0;
  95 +       plat_dat->tx_fifo_size = 8192;
  96 +       plat_dat->rx_fifo_size = 8192;
  97
  98         err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
  99         if (err)