| Message ID | 20220429115807.2198448-1-tee.min.tan@linux.intel.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 47f753c1108e287edb3e27fad8a7511a9d55578e |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net,v2,1/1] net: stmmac: disable Split Header (SPH) for Intel platforms | expand |
Hello: This patch was applied to netdev/net.git (master) by David S. Miller <davem@davemloft.net>: On Fri, 29 Apr 2022 19:58:07 +0800 you wrote: > Based on DesignWare Ethernet QoS datasheet, we are seeing the limitation > of Split Header (SPH) feature is not supported for Ipv4 fragmented packet. > This SPH limitation will cause ping failure when the packets size exceed > the MTU size. For example, the issue happens once the basic ping packet > size is larger than the configured MTU size and the data is lost inside > the fragmented packet, replaced by zeros/corrupted values, and leads to > ping fail. > > [...] Here is the summary with links: - [net,v2,1/1] net: stmmac: disable Split Header (SPH) for Intel platforms https://git.kernel.org/netdev/net/c/47f753c1108e You are awesome, thank you!
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c index 63754a9c4ba7..0b0be0898ac5 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c @@ -454,6 +454,7 @@ static int intel_mgbe_common_data(struct pci_dev *pdev, plat->has_gmac4 = 1; plat->force_sf_dma_mode = 0; plat->tso_en = 1; + plat->sph_disable = 1; /* Multiplying factor to the clk_eee_i clock time * period to make it closer to 100 ns. This value diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 4a4b3651ab3e..2525a80353b7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -7021,7 +7021,7 @@ int stmmac_dvr_probe(struct device *device, dev_info(priv->device, "TSO feature enabled\n"); } - if (priv->dma_cap.sphen) { + if (priv->dma_cap.sphen && !priv->plat->sph_disable) { ndev->hw_features |= NETIF_F_GRO; priv->sph_cap = true; priv->sph = priv->sph_cap; diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index 24eea1b05ca2..29917850f079 100644 --- a/include/linux/stmmac.h +++ b/include/linux/stmmac.h @@ -270,5 +270,6 @@ struct plat_stmmacenet_data { int msi_rx_base_vec; int msi_tx_base_vec; bool use_phy_wol; + bool sph_disable; }; #endif
Based on DesignWare Ethernet QoS datasheet, we are seeing the limitation of Split Header (SPH) feature is not supported for Ipv4 fragmented packet. This SPH limitation will cause ping failure when the packets size exceed the MTU size. For example, the issue happens once the basic ping packet size is larger than the configured MTU size and the data is lost inside the fragmented packet, replaced by zeros/corrupted values, and leads to ping fail. So, disable the Split Header for Intel platforms. v2: Add fixes tag in commit message. Fixes: 67afd6d1cfdf("net: stmmac: Add Split Header support and enable it in XGMAC cores") Cc: <stable@vger.kernel.org> # 5.10.x Suggested-by: Ong, Boon Leong <boon.leong.ong@intel.com> Signed-off-by: Mohammad Athari Bin Ismail <mohammad.athari.ismail@intel.com> Signed-off-by: Wong Vee Khee <vee.khee.wong@linux.intel.com> Signed-off-by: Tan Tee Min <tee.min.tan@linux.intel.com> --- drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 1 + drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +- include/linux/stmmac.h | 1 + 3 files changed, 3 insertions(+), 1 deletion(-)