| Message ID | 20201029063915.4287-1-dqfext@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [RFC,net-next] net: ethernet: mediatek: support setting MTU | expand |
On Thu, Oct 29, 2020 at 02:39:15PM +0800, DENG Qingfang wrote: > MT762x HW supports frame length up to 2048 (maximum length on GDM), > so allow setting MTU up to 2030. > > Signed-off-by: DENG Qingfang <dqfext@gmail.com> > --- > > I only tested this on MT7621, no sure if it is applicable for other SoCs > especially MT7628, which has an old IP. > > --- > drivers/net/ethernet/mediatek/mtk_eth_soc.c | 31 ++++++++++++++++++++- > drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++++-- > 2 files changed, 38 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > index 6d2d60675ffd..a0c56d9be1d5 100644 > --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c > +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > @@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode, > /* Setup gmac */ > mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); > mcr_new = mcr_cur; > - mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > + mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK; Since you no longer set MAC_MCR_MAX_RX_1536, what does the hardware default to? > /* Only update control register when needed! */ > @@ -2499,6 +2499,34 @@ static void mtk_uninit(struct net_device *dev) > mtk_rx_irq_disable(eth, ~0); > } > > +static int mtk_change_mtu(struct net_device *dev, int new_mtu) > +{ > + struct mtk_mac *mac = netdev_priv(dev); > + u32 mcr_cur, mcr_new; > + int length; > + > + mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); > + mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_LEN_MASK; > + length = new_mtu + MTK_RX_ETH_HLEN; > + > + if (length <= 1518) > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1518); > + else if (length <= 1536) > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1536); > + else if (length <= 1552) > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1552); > + else > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_2048); You should have another if here, and return -EIVAL is the user asked for an MTU of 2049 of greater. Andrew
On Thu, Oct 29, 2020 at 9:02 PM Andrew Lunn <andrew@lunn.ch> wrote: > > On Thu, Oct 29, 2020 at 02:39:15PM +0800, DENG Qingfang wrote: > > MT762x HW supports frame length up to 2048 (maximum length on GDM), > > so allow setting MTU up to 2030. > > > > Signed-off-by: DENG Qingfang <dqfext@gmail.com> > > --- > > > > I only tested this on MT7621, no sure if it is applicable for other SoCs > > especially MT7628, which has an old IP. > > > > --- > > drivers/net/ethernet/mediatek/mtk_eth_soc.c | 31 ++++++++++++++++++++- > > drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++++-- > > 2 files changed, 38 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > index 6d2d60675ffd..a0c56d9be1d5 100644 > > --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > @@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode, > > /* Setup gmac */ > > mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); > > mcr_new = mcr_cur; > > - mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > > + mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > > MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK; > > Since you no longer set MAC_MCR_MAX_RX_1536, what does the hardware > default to? 2'b00, i.e. 1518 bytes. > > > /* Only update control register when needed! */ > > @@ -2499,6 +2499,34 @@ static void mtk_uninit(struct net_device *dev) > > mtk_rx_irq_disable(eth, ~0); > > } > > > > +static int mtk_change_mtu(struct net_device *dev, int new_mtu) > > +{ > > + struct mtk_mac *mac = netdev_priv(dev); > > + u32 mcr_cur, mcr_new; > > + int length; > > + > > + mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); > > + mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_LEN_MASK; > > + length = new_mtu + MTK_RX_ETH_HLEN; > > + > > + if (length <= 1518) > > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1518); > > + else if (length <= 1536) > > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1536); > > + else if (length <= 1552) > > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1552); > > + else > > + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_2048); > > You should have another if here, and return -EIVAL is the user asked > for an MTU of 2049 of greater. It is handled in net_device->max_mtu: > eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN; As I tested: > # ip link set eth0 mtu 2031 > RTNETLINK answers: Invalid argument > > Andrew
On Fri, Oct 30, 2020 at 10:43:51AM +0800, DENG Qingfang wrote: > On Thu, Oct 29, 2020 at 9:02 PM Andrew Lunn <andrew@lunn.ch> wrote: > > > > On Thu, Oct 29, 2020 at 02:39:15PM +0800, DENG Qingfang wrote: > > > MT762x HW supports frame length up to 2048 (maximum length on GDM), > > > so allow setting MTU up to 2030. > > > > > > Signed-off-by: DENG Qingfang <dqfext@gmail.com> > > > --- > > > > > > I only tested this on MT7621, no sure if it is applicable for other SoCs > > > especially MT7628, which has an old IP. > > > > > > --- > > > drivers/net/ethernet/mediatek/mtk_eth_soc.c | 31 ++++++++++++++++++++- > > > drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++++-- > > > 2 files changed, 38 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > > index 6d2d60675ffd..a0c56d9be1d5 100644 > > > --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > > +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > > > @@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode, > > > /* Setup gmac */ > > > mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); > > > mcr_new = mcr_cur; > > > - mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > > > + mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | > > > MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK; > > > > Since you no longer set MAC_MCR_MAX_RX_1536, what does the hardware > > default to? > > 2'b00, i.e. 1518 bytes. O.K, that fits the default for a netdev. > It is handled in net_device->max_mtu: > > eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN; Cool. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Andrew
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 6d2d60675ffd..a0c56d9be1d5 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -353,7 +353,7 @@ static void mtk_mac_config(struct phylink_config *config, unsigned int mode, /* Setup gmac */ mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); mcr_new = mcr_cur; - mcr_new |= MAC_MCR_MAX_RX_1536 | MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | + mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE | MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK; /* Only update control register when needed! */ @@ -2499,6 +2499,34 @@ static void mtk_uninit(struct net_device *dev) mtk_rx_irq_disable(eth, ~0); } +static int mtk_change_mtu(struct net_device *dev, int new_mtu) +{ + struct mtk_mac *mac = netdev_priv(dev); + u32 mcr_cur, mcr_new; + int length; + + mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id)); + mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_LEN_MASK; + length = new_mtu + MTK_RX_ETH_HLEN; + + if (length <= 1518) + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1518); + else if (length <= 1536) + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1536); + else if (length <= 1552) + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_1552); + else + mcr_new |= MAC_MCR_MAX_RX_LEN(MAC_MCR_MAX_RX_LEN_2048); + + /* Only update control register when needed! */ + if (mcr_new != mcr_cur) + mtk_w32(mac->hw, mcr_new, MTK_MAC_MCR(mac->id)); + + dev->mtu = new_mtu; + + return 0; +} + static int mtk_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct mtk_mac *mac = netdev_priv(dev); @@ -2795,6 +2823,7 @@ static const struct net_device_ops mtk_netdev_ops = { .ndo_set_mac_address = mtk_set_mac_address, .ndo_validate_addr = eth_validate_addr, .ndo_do_ioctl = mtk_do_ioctl, + .ndo_change_mtu = mtk_change_mtu, .ndo_tx_timeout = mtk_tx_timeout, .ndo_get_stats64 = mtk_get_stats64, .ndo_fix_features = mtk_fix_features, diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index 454cfcd465fd..cfc11654ccd6 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -17,12 +17,12 @@ #include <linux/phylink.h> #define MTK_QDMA_PAGE_SIZE 2048 -#define MTK_MAX_RX_LENGTH 1536 +#define MTK_MAX_RX_LENGTH 2048 #define MTK_TX_DMA_BUF_LEN 0x3fff #define MTK_DMA_SIZE 256 #define MTK_NAPI_WEIGHT 64 #define MTK_MAC_COUNT 2 -#define MTK_RX_ETH_HLEN (VLAN_ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN) +#define MTK_RX_ETH_HLEN (ETH_HLEN + ETH_FCS_LEN) #define MTK_RX_HLEN (NET_SKB_PAD + MTK_RX_ETH_HLEN + NET_IP_ALIGN) #define MTK_DMA_DUMMY_DESC 0xffffffff #define MTK_DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | \ @@ -320,7 +320,12 @@ /* Mac control registers */ #define MTK_MAC_MCR(x) (0x10100 + (x * 0x100)) -#define MAC_MCR_MAX_RX_1536 BIT(24) +#define MAC_MCR_MAX_RX_LEN_MASK GENMASK(25, 24) +#define MAC_MCR_MAX_RX_LEN(_x) (MAC_MCR_MAX_RX_LEN_MASK & ((_x) << 24)) +#define MAC_MCR_MAX_RX_LEN_1518 0x0 +#define MAC_MCR_MAX_RX_LEN_1536 0x1 +#define MAC_MCR_MAX_RX_LEN_1552 0x2 +#define MAC_MCR_MAX_RX_LEN_2048 0x3 #define MAC_MCR_IPG_CFG (BIT(18) | BIT(16)) #define MAC_MCR_FORCE_MODE BIT(15) #define MAC_MCR_TX_EN BIT(14)
MT762x HW supports frame length up to 2048 (maximum length on GDM), so allow setting MTU up to 2030. Signed-off-by: DENG Qingfang <dqfext@gmail.com> --- I only tested this on MT7621, no sure if it is applicable for other SoCs especially MT7628, which has an old IP. --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 31 ++++++++++++++++++++- drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 ++++++-- 2 files changed, 38 insertions(+), 4 deletions(-)