From: Grygorii Strashko grygorii.strashko@ti.com
[ Upstream commit 97067aaf127487788a297267dede0008cd75bb7b ]
The current implementation uses .ndo_set_features() callback to track NETIF_F_HW_CSUM feature changes and update generic CPSW_P0_CONTROL_REG.RX_CHECKSUM_EN option accordingly. It's not going to work in case of multi-port devices as TX csum offload can be changed per netdev.
On K3 CPSWxG devices TX csum offload enabled in the following way:
- the CPSW_P0_CONTROL_REG.RX_CHECKSUM_EN option enables TX csum offload in generic and affects all TX DMA channels and packets;
- corresponding fields in TX DMA descriptor have to be filed properly when upper layer wants to offload TX csum (skb->ip_summed == CHECKSUM_PARTIAL) and it's per-packet option.
The Linux Network core is expected to never request TX csum offload if netdev NETIF_F_HW_CSUM feature is disabled, and, as result, TX DMA descriptors should not be modified, and per-packet TX csum offload will be disabled (or enabled) on per-netdev basis. Which, in turn, makes it safe to enable the CPSW_P0_CONTROL_REG.RX_CHECKSUM_EN option unconditionally.
Hence, fix TX csum offload for multi-port devices by: - enabling the CPSW_P0_CONTROL_REG.RX_CHECKSUM_EN option in am65_cpsw_nuss_common_open() unconditionally - and removing .ndo_set_features() callback implementation, which was used only NETIF_F_HW_CSUM feature update purposes
Signed-off-by: Grygorii Strashko grygorii.strashko@ti.com Reviewed-by: Jesse Brandeburg jesse.brandeburg@intel.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ti/am65-cpsw-nuss.c | 30 +----------------------- 1 file changed, 1 insertion(+), 29 deletions(-)
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 501d676fd88b9..9c359570178c1 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -426,9 +426,7 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common, writel(common->rx_flow_id_base, host_p->port_base + AM65_CPSW_PORT0_REG_FLOW_ID_OFFSET); /* en tx crc offload */ - if (features & NETIF_F_HW_CSUM) - writel(AM65_CPSW_P0_REG_CTL_RX_CHECKSUM_EN, - host_p->port_base + AM65_CPSW_P0_REG_CTL); + writel(AM65_CPSW_P0_REG_CTL_RX_CHECKSUM_EN, host_p->port_base + AM65_CPSW_P0_REG_CTL);
am65_cpsw_nuss_set_p0_ptype(common);
@@ -1369,31 +1367,6 @@ static void am65_cpsw_nuss_ndo_get_stats(struct net_device *dev, stats->tx_dropped = dev->stats.tx_dropped; }
-static int am65_cpsw_nuss_ndo_slave_set_features(struct net_device *ndev, - netdev_features_t features) -{ - struct am65_cpsw_common *common = am65_ndev_to_common(ndev); - netdev_features_t changes = features ^ ndev->features; - struct am65_cpsw_host *host_p; - - host_p = am65_common_get_host(common); - - if (changes & NETIF_F_HW_CSUM) { - bool enable = !!(features & NETIF_F_HW_CSUM); - - dev_info(common->dev, "Turn %s tx-checksum-ip-generic\n", - enable ? "ON" : "OFF"); - if (enable) - writel(AM65_CPSW_P0_REG_CTL_RX_CHECKSUM_EN, - host_p->port_base + AM65_CPSW_P0_REG_CTL); - else - writel(0, - host_p->port_base + AM65_CPSW_P0_REG_CTL); - } - - return 0; -} - static const struct net_device_ops am65_cpsw_nuss_netdev_ops_2g = { .ndo_open = am65_cpsw_nuss_ndo_slave_open, .ndo_stop = am65_cpsw_nuss_ndo_slave_stop, @@ -1406,7 +1379,6 @@ static const struct net_device_ops am65_cpsw_nuss_netdev_ops_2g = { .ndo_vlan_rx_add_vid = am65_cpsw_nuss_ndo_slave_add_vid, .ndo_vlan_rx_kill_vid = am65_cpsw_nuss_ndo_slave_kill_vid, .ndo_do_ioctl = am65_cpsw_nuss_ndo_slave_ioctl, - .ndo_set_features = am65_cpsw_nuss_ndo_slave_set_features, .ndo_setup_tc = am65_cpsw_qos_ndo_setup_tc, };