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Merge branch 'net-lan966x-fixes-for-when-mtu-is-changed'

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Horatiu Vultur says:

====================
net: lan966x: Fixes for when MTU is changed

There were multiple problems in different parts of the driver when
the MTU was changed.
The first problem was that the HW was missing to configure the correct
value, it was missing ETH_HLEN and ETH_FCS_LEN. The second problem was
when vlan filtering was enabled/disabled, the MRU was not adjusted
corretly. While the last issue was that the FDMA was calculated wrongly
the correct maximum MTU.
====================

Link: https://lore.kernel.org/r/20221030213636.1031408-1-horatiu.vultur@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2022-11-01 21:18:20 -07:00
parent 6c412da54c 872ad758f9
commit 70644f722f
5 changed files with 31 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
View File

@@ -668,12 +668,14 @@ static int lan966x_fdma_get_max_mtu(struct lan966x *lan966x)
int i;
for (i = 0; i < lan966x->num_phys_ports; ++i) {
struct lan966x_port *port;
int mtu;
if (!lan966x->ports[i])
port = lan966x->ports[i];
if (!port)
continue;
mtu = lan966x->ports[i]->dev->mtu;
mtu = lan_rd(lan966x, DEV_MAC_MAXLEN_CFG(port->chip_port));
if (mtu > max_mtu)
max_mtu = mtu;
}
@@ -733,6 +735,8 @@ int lan966x_fdma_change_mtu(struct lan966x *lan966x)
max_mtu = lan966x_fdma_get_max_mtu(lan966x);
max_mtu += IFH_LEN * sizeof(u32);
max_mtu += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
max_mtu += VLAN_HLEN * 2;
if (round_up(max_mtu, PAGE_SIZE) / PAGE_SIZE - 1 ==
lan966x->rx.page_order)

4
drivers/net/ethernet/microchip/lan966x/lan966x_main.c
View File

@@ -386,7 +386,7 @@ static int lan966x_port_change_mtu(struct net_device *dev, int new_mtu)
int old_mtu = dev->mtu;
int err;
lan_wr(DEV_MAC_MAXLEN_CFG_MAX_LEN_SET(new_mtu),
lan_wr(DEV_MAC_MAXLEN_CFG_MAX_LEN_SET(LAN966X_HW_MTU(new_mtu)),
lan966x, DEV_MAC_MAXLEN_CFG(port->chip_port));
dev->mtu = new_mtu;
@@ -395,7 +395,7 @@ static int lan966x_port_change_mtu(struct net_device *dev, int new_mtu)
err = lan966x_fdma_change_mtu(lan966x);
if (err) {
lan_wr(DEV_MAC_MAXLEN_CFG_MAX_LEN_SET(old_mtu),
lan_wr(DEV_MAC_MAXLEN_CFG_MAX_LEN_SET(LAN966X_HW_MTU(old_mtu)),
lan966x, DEV_MAC_MAXLEN_CFG(port->chip_port));
dev->mtu = old_mtu;
}

2
drivers/net/ethernet/microchip/lan966x/lan966x_main.h
View File

@@ -26,6 +26,8 @@
#define LAN966X_BUFFER_MEMORY (160 * 1024)
#define LAN966X_BUFFER_MIN_SZ 60
#define LAN966X_HW_MTU(mtu) ((mtu) + ETH_HLEN + ETH_FCS_LEN)
#define PGID_AGGR 64
#define PGID_SRC 80
#define PGID_ENTRIES 89

15
drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
View File

@@ -585,6 +585,21 @@ enum lan966x_target {
#define DEV_MAC_MAXLEN_CFG_MAX_LEN_GET(x)\
FIELD_GET(DEV_MAC_MAXLEN_CFG_MAX_LEN, x)
/* DEV:MAC_CFG_STATUS:MAC_TAGS_CFG */
#define DEV_MAC_TAGS_CFG(t) __REG(TARGET_DEV, t, 8, 28, 0, 1, 44, 12, 0, 1, 4)
#define DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA BIT(1)
#define DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA_SET(x)\
FIELD_PREP(DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA, x)
#define DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA_GET(x)\
FIELD_GET(DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA, x)
#define DEV_MAC_TAGS_CFG_VLAN_AWR_ENA BIT(0)
#define DEV_MAC_TAGS_CFG_VLAN_AWR_ENA_SET(x)\
FIELD_PREP(DEV_MAC_TAGS_CFG_VLAN_AWR_ENA, x)
#define DEV_MAC_TAGS_CFG_VLAN_AWR_ENA_GET(x)\
FIELD_GET(DEV_MAC_TAGS_CFG_VLAN_AWR_ENA, x)
/* DEV:MAC_CFG_STATUS:MAC_IFG_CFG */
#define DEV_MAC_IFG_CFG(t) __REG(TARGET_DEV, t, 8, 28, 0, 1, 44, 20, 0, 1, 4)

6
drivers/net/ethernet/microchip/lan966x/lan966x_vlan.c
View File

@@ -169,6 +169,12 @@ void lan966x_vlan_port_apply(struct lan966x_port *port)
ANA_VLAN_CFG_VLAN_POP_CNT,
lan966x, ANA_VLAN_CFG(port->chip_port));
lan_rmw(DEV_MAC_TAGS_CFG_VLAN_AWR_ENA_SET(port->vlan_aware) |
DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA_SET(port->vlan_aware),
DEV_MAC_TAGS_CFG_VLAN_AWR_ENA |
DEV_MAC_TAGS_CFG_VLAN_DBL_AWR_ENA,
lan966x, DEV_MAC_TAGS_CFG(port->chip_port));
/* Drop frames with multicast source address */
val = ANA_DROP_CFG_DROP_MC_SMAC_ENA_SET(1);
if (port->vlan_aware && !pvid)