From dcf1150f2e69d6ad44a98f61bab48b2f75f4c9e2 Mon Sep 17 00:00:00 2001 From: Tan Tee Min Date: Fri, 29 Apr 2022 19:58:07 +0800 Subject: [PATCH] net: stmmac: disable Split Header (SPH) for Intel platforms commit 47f753c1108e287edb3e27fad8a7511a9d55578e upstream. 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: # 5.10.x Suggested-by: Ong, Boon Leong Signed-off-by: Mohammad Athari Bin Ismail Signed-off-by: Wong Vee Khee Signed-off-by: Tan Tee Min Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- 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(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c index a9087dae767d..fb065b074553 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c @@ -243,6 +243,7 @@ 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; plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP; diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index a46c32257de4..e9aa9a5eba6b 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -5046,7 +5046,7 @@ 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 = true; dev_info(priv->device, "SPH feature enabled\n"); diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index b56e1dedcf2f..40df88728a6f 100644 --- a/include/linux/stmmac.h +++ b/include/linux/stmmac.h @@ -203,5 +203,6 @@ struct plat_stmmacenet_data { bool vlan_fail_q_en; u8 vlan_fail_q; unsigned int eee_usecs_rate; + bool sph_disable; }; #endif