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net: stmmac: disable Split Header (SPH) for Intel platforms 

commit 47f753c110 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: <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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tan Tee Min 2022-04-29 19:58:07 +08:00 committed by Greg Kroah-Hartman
parent 68f35987d4
commit dcf1150f2e
3 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
View File

@ -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;

2
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -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");

1
include/linux/stmmac.h
View File

@ -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