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Date: Wed, 8 Jul 2020 10:00:36 -0700
From: Alexander Duyck <alexander.duyck@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: David Miller <davem@...emloft.net>,
Netdev <netdev@...r.kernel.org>,
Saeed Mahameed <saeedm@...lanox.com>,
Michael Chan <michael.chan@...adcom.com>,
edwin.peer@...adcom.com,
"Tantilov, Emil S" <emil.s.tantilov@...el.com>,
Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Tariq Toukan <tariqt@...lanox.com>,
Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH net-next 7/9] ixgbe: convert to new udp_tunnel_nic infra
On Tue, Jul 7, 2020 at 2:28 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Make use of new common udp_tunnel_nic infra. ixgbe supports
> IPv4 only, and only single VxLAN and Geneve ports (one each).
>
> I'm dropping the confusing piece of code in ixgbe_set_features().
> ndo_udp_tunnel_add and ndo_udp_tunnel_del did not check if RXCSUM
> is enabled, so this code was either unnecessary or buggy anyway.
The code is unnecessary from what I can tell. I suspect the reason for
adding the code was because the port values are used when performing
the Rx checksum offload. However we never disable it in hardware, and
the software path in ixgbe_rx_checksum will simply disable the related
code anyway since we cannot set skb->encapsulation if RXCSUM is
disabled.
With that said moving this to a separate patch might be preferable as
it would make the patch more readable.
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe.h | 3 -
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 195 ++++--------------
> 2 files changed, 37 insertions(+), 161 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> index debbcf216134..1e8a809233a0 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> @@ -588,11 +588,9 @@ struct ixgbe_adapter {
> #define IXGBE_FLAG_FCOE_ENABLED BIT(21)
> #define IXGBE_FLAG_SRIOV_CAPABLE BIT(22)
> #define IXGBE_FLAG_SRIOV_ENABLED BIT(23)
> -#define IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE BIT(24)
> #define IXGBE_FLAG_RX_HWTSTAMP_ENABLED BIT(25)
> #define IXGBE_FLAG_RX_HWTSTAMP_IN_REGISTER BIT(26)
> #define IXGBE_FLAG_DCB_CAPABLE BIT(27)
> -#define IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE BIT(28)
>
> u32 flags2;
> #define IXGBE_FLAG2_RSC_CAPABLE BIT(0)
> @@ -606,7 +604,6 @@ struct ixgbe_adapter {
> #define IXGBE_FLAG2_RSS_FIELD_IPV6_UDP BIT(9)
> #define IXGBE_FLAG2_PTP_PPS_ENABLED BIT(10)
> #define IXGBE_FLAG2_PHY_INTERRUPT BIT(11)
> -#define IXGBE_FLAG2_UDP_TUN_REREG_NEEDED BIT(12)
> #define IXGBE_FLAG2_VLAN_PROMISC BIT(13)
> #define IXGBE_FLAG2_EEE_CAPABLE BIT(14)
> #define IXGBE_FLAG2_EEE_ENABLED BIT(15)
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index f5d3d6230786..29f1313b5ab0 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -4994,25 +4994,40 @@ static void ixgbe_napi_disable_all(struct ixgbe_adapter *adapter)
> napi_disable(&adapter->q_vector[q_idx]->napi);
> }
>
> -static void ixgbe_clear_udp_tunnel_port(struct ixgbe_adapter *adapter, u32 mask)
> +static int ixgbe_udp_tunnel_sync(struct net_device *dev, unsigned int table)
> {
> + struct ixgbe_adapter *adapter = netdev_priv(dev);
> struct ixgbe_hw *hw = &adapter->hw;
> - u32 vxlanctrl;
> -
> - if (!(adapter->flags & (IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE |
> - IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE)))
> - return;
> + struct udp_tunnel_info ti;
>
> - vxlanctrl = IXGBE_READ_REG(hw, IXGBE_VXLANCTRL) & ~mask;
> - IXGBE_WRITE_REG(hw, IXGBE_VXLANCTRL, vxlanctrl);
> -
> - if (mask & IXGBE_VXLANCTRL_VXLAN_UDPPORT_MASK)
> - adapter->vxlan_port = 0;
> + udp_tunnel_nic_get_port(dev, table, 0, &ti);
> + if (!table)
> + adapter->vxlan_port = ti.port;
> + else
> + adapter->geneve_port = ti.port;
So this !table thing is a bit hard to read. It might be more useful if
you had a define that made it clear that the expectation is that entry
0 is a VXLAN table and entry 1 is the GENEVE.
>
> - if (mask & IXGBE_VXLANCTRL_GENEVE_UDPPORT_MASK)
> - adapter->geneve_port = 0;
> + IXGBE_WRITE_REG(hw, IXGBE_VXLANCTRL,
> + ntohs(adapter->vxlan_port) |
> + ntohs(adapter->geneve_port) <<
> + IXGBE_VXLANCTRL_GENEVE_UDPPORT_SHIFT);
> + return 0;
> }
I'm assuming the new logic will call this for all entries in the
tables regardless of if they are set or not. If so I suppose this is
fine.
> +static const struct udp_tunnel_nic_info ixgbe_udp_tunnels_x550 = {
> + .sync_table = ixgbe_udp_tunnel_sync,
> + .flags = UDP_TUNNEL_NIC_INFO_IPV4_ONLY,
> + .tables = {
> + { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, },
> + },
> +}, ixgbe_udp_tunnels_x550em_a = {
> + .sync_table = ixgbe_udp_tunnel_sync,
> + .flags = UDP_TUNNEL_NIC_INFO_IPV4_ONLY,
> + .tables = {
> + { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, },
> + { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_GENEVE, },
> + },
> +};
> +
This should really be two seperate declarations. It is a bit ugly to
read a structure definition starting with "},".
> #ifdef CONFIG_IXGBE_DCB
> /**
> * ixgbe_configure_dcb - Configure DCB hardware
> @@ -6227,6 +6242,7 @@ static void ixgbe_init_dcb(struct ixgbe_adapter *adapter)
> /**
> * ixgbe_sw_init - Initialize general software structures (struct ixgbe_adapter)
> * @adapter: board private structure to initialize
> + * @netdev: network interface device structure
> * @ii: pointer to ixgbe_info for device
> *
> * ixgbe_sw_init initializes the Adapter private data structure.
> @@ -6234,6 +6250,7 @@ static void ixgbe_init_dcb(struct ixgbe_adapter *adapter)
> * OS network device settings (MTU size).
> **/
> static int ixgbe_sw_init(struct ixgbe_adapter *adapter,
> + struct net_device *netdev,
> const struct ixgbe_info *ii)
> {
> struct ixgbe_hw *hw = &adapter->hw;
There is no need to add the argument. It should be accessible via
adapter->netdev, or for that matter you could pass the netdev and drop
the adapter and just pull it out via netdev_priv since the two are all
contained in the same structure anyway. Another option would be to
just pull the logic out of this section and put it in a switch
statement of its own in the probe function.
> @@ -6332,7 +6349,7 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter,
> adapter->flags2 |= IXGBE_FLAG2_TEMP_SENSOR_CAPABLE;
> break;
> case ixgbe_mac_x550em_a:
> - adapter->flags |= IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE;
> + netdev->udp_tunnel_nic_info = &ixgbe_udp_tunnels_x550em_a;
> switch (hw->device_id) {
> case IXGBE_DEV_ID_X550EM_A_1G_T:
> case IXGBE_DEV_ID_X550EM_A_1G_T_L:
> @@ -6359,7 +6376,8 @@ static int ixgbe_sw_init(struct ixgbe_adapter *adapter,
> #ifdef CONFIG_IXGBE_DCA
> adapter->flags &= ~IXGBE_FLAG_DCA_CAPABLE;
> #endif
> - adapter->flags |= IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE;
> + if (!netdev->udp_tunnel_nic_info)
> + netdev->udp_tunnel_nic_info = &ixgbe_udp_tunnels_x550;
> break;
> default:
> break;
Not a fan of the !udp_tunnel_nic_info check, but I understand you are
having to do it because of the fall-through.
> @@ -6798,8 +6816,7 @@ int ixgbe_open(struct net_device *netdev)
>
> ixgbe_up_complete(adapter);
>
> - ixgbe_clear_udp_tunnel_port(adapter, IXGBE_VXLANCTRL_ALL_UDPPORT_MASK);
> - udp_tunnel_get_rx_info(netdev);
> + udp_tunnel_nic_reset_ntf(netdev);
>
> return 0;
So I went looking through the earlier patches for an explanation of
udp_tunnel_nic_reset_ntf. It might be useful to have some doxygen
comments with the declaration explaining what it does and when/why we
should use it.
> @@ -7921,12 +7938,6 @@ static void ixgbe_service_task(struct work_struct *work)
> ixgbe_service_event_complete(adapter);
> return;
> }
> - if (adapter->flags2 & IXGBE_FLAG2_UDP_TUN_REREG_NEEDED) {
> - rtnl_lock();
> - adapter->flags2 &= ~IXGBE_FLAG2_UDP_TUN_REREG_NEEDED;
> - udp_tunnel_get_rx_info(adapter->netdev);
> - rtnl_unlock();
> - }
> ixgbe_reset_subtask(adapter);
> ixgbe_phy_interrupt_subtask(adapter);
> ixgbe_sfp_detection_subtask(adapter);
Like I said earlier, this and the other REREG removal bits below might
make more sense in another patch.
> @@ -9784,26 +9795,6 @@ static int ixgbe_set_features(struct net_device *netdev,
>
> netdev->features = features;
>
> - if ((adapter->flags & IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE)) {
> - if (features & NETIF_F_RXCSUM) {
> - adapter->flags2 |= IXGBE_FLAG2_UDP_TUN_REREG_NEEDED;
> - } else {
> - u32 port_mask = IXGBE_VXLANCTRL_VXLAN_UDPPORT_MASK;
> -
> - ixgbe_clear_udp_tunnel_port(adapter, port_mask);
> - }
> - }
> -
> - if ((adapter->flags & IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE)) {
> - if (features & NETIF_F_RXCSUM) {
> - adapter->flags2 |= IXGBE_FLAG2_UDP_TUN_REREG_NEEDED;
> - } else {
> - u32 port_mask = IXGBE_VXLANCTRL_GENEVE_UDPPORT_MASK;
> -
> - ixgbe_clear_udp_tunnel_port(adapter, port_mask);
> - }
> - }
> -
> if ((changed & NETIF_F_HW_L2FW_DOFFLOAD) && adapter->num_rx_pools > 1)
> ixgbe_reset_l2fw_offload(adapter);
> else if (need_reset)
> @@ -9815,118 +9806,6 @@ static int ixgbe_set_features(struct net_device *netdev,
> return 1;
> }
>
> -/**
> - * ixgbe_add_udp_tunnel_port - Get notifications about adding UDP tunnel ports
> - * @dev: The port's netdev
> - * @ti: Tunnel endpoint information
> - **/
> -static void ixgbe_add_udp_tunnel_port(struct net_device *dev,
> - struct udp_tunnel_info *ti)
> -{
> - struct ixgbe_adapter *adapter = netdev_priv(dev);
> - struct ixgbe_hw *hw = &adapter->hw;
> - __be16 port = ti->port;
> - u32 port_shift = 0;
> - u32 reg;
> -
> - if (ti->sa_family != AF_INET)
> - return;
> -
> - switch (ti->type) {
> - case UDP_TUNNEL_TYPE_VXLAN:
> - if (!(adapter->flags & IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE))
> - return;
> -
> - if (adapter->vxlan_port == port)
> - return;
> -
> - if (adapter->vxlan_port) {
> - netdev_info(dev,
> - "VXLAN port %d set, not adding port %d\n",
> - ntohs(adapter->vxlan_port),
> - ntohs(port));
> - return;
> - }
> -
> - adapter->vxlan_port = port;
> - break;
> - case UDP_TUNNEL_TYPE_GENEVE:
> - if (!(adapter->flags & IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE))
> - return;
> -
> - if (adapter->geneve_port == port)
> - return;
> -
> - if (adapter->geneve_port) {
> - netdev_info(dev,
> - "GENEVE port %d set, not adding port %d\n",
> - ntohs(adapter->geneve_port),
> - ntohs(port));
> - return;
> - }
> -
> - port_shift = IXGBE_VXLANCTRL_GENEVE_UDPPORT_SHIFT;
> - adapter->geneve_port = port;
> - break;
> - default:
> - return;
> - }
> -
> - reg = IXGBE_READ_REG(hw, IXGBE_VXLANCTRL) | ntohs(port) << port_shift;
> - IXGBE_WRITE_REG(hw, IXGBE_VXLANCTRL, reg);
> -}
> -
> -/**
> - * ixgbe_del_udp_tunnel_port - Get notifications about removing UDP tunnel ports
> - * @dev: The port's netdev
> - * @ti: Tunnel endpoint information
> - **/
> -static void ixgbe_del_udp_tunnel_port(struct net_device *dev,
> - struct udp_tunnel_info *ti)
> -{
> - struct ixgbe_adapter *adapter = netdev_priv(dev);
> - u32 port_mask;
> -
> - if (ti->type != UDP_TUNNEL_TYPE_VXLAN &&
> - ti->type != UDP_TUNNEL_TYPE_GENEVE)
> - return;
> -
> - if (ti->sa_family != AF_INET)
> - return;
> -
> - switch (ti->type) {
> - case UDP_TUNNEL_TYPE_VXLAN:
> - if (!(adapter->flags & IXGBE_FLAG_VXLAN_OFFLOAD_CAPABLE))
> - return;
> -
> - if (adapter->vxlan_port != ti->port) {
> - netdev_info(dev, "VXLAN port %d not found\n",
> - ntohs(ti->port));
> - return;
> - }
> -
> - port_mask = IXGBE_VXLANCTRL_VXLAN_UDPPORT_MASK;
> - break;
> - case UDP_TUNNEL_TYPE_GENEVE:
> - if (!(adapter->flags & IXGBE_FLAG_GENEVE_OFFLOAD_CAPABLE))
> - return;
> -
> - if (adapter->geneve_port != ti->port) {
> - netdev_info(dev, "GENEVE port %d not found\n",
> - ntohs(ti->port));
> - return;
> - }
> -
> - port_mask = IXGBE_VXLANCTRL_GENEVE_UDPPORT_MASK;
> - break;
> - default:
> - return;
> - }
> -
> - ixgbe_clear_udp_tunnel_port(adapter, port_mask);
> - adapter->flags2 |= IXGBE_FLAG2_UDP_TUN_REREG_NEEDED;
> -}
> -
> static int ixgbe_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
> struct net_device *dev,
> const unsigned char *addr, u16 vid,
> @@ -10416,8 +10295,8 @@ static const struct net_device_ops ixgbe_netdev_ops = {
> .ndo_bridge_getlink = ixgbe_ndo_bridge_getlink,
> .ndo_dfwd_add_station = ixgbe_fwd_add,
> .ndo_dfwd_del_station = ixgbe_fwd_del,
> - .ndo_udp_tunnel_add = ixgbe_add_udp_tunnel_port,
> - .ndo_udp_tunnel_del = ixgbe_del_udp_tunnel_port,
> + .ndo_udp_tunnel_add = udp_tunnel_nic_add_port,
> + .ndo_udp_tunnel_del = udp_tunnel_nic_del_port,
> .ndo_features_check = ixgbe_features_check,
> .ndo_bpf = ixgbe_xdp,
> .ndo_xdp_xmit = ixgbe_xdp_xmit,
> @@ -10858,7 +10737,7 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> hw->phy.mdio.mdio_write = ixgbe_mdio_write;
>
> /* setup the private structure */
> - err = ixgbe_sw_init(adapter, ii);
> + err = ixgbe_sw_init(adapter, netdev, ii);
> if (err)
> goto err_sw_init;
>
> --
> 2.26.2
>
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