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Date: Wed, 29 Mar 2023 21:52:35 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Louis Peens <louis.peens@...igine.com>
Cc: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Simon Horman <simon.horman@...igine.com>,
netdev@...r.kernel.org, oss-drivers@...igine.com,
Yinjun Zhang <yinjun.zhang@...igine.com>
Subject: Re: [PATCH net-next 2/2] nfp: separate the port's upper state with
lower phy state
On Wed, Mar 29, 2023 at 04:45:48PM +0200, Louis Peens wrote:
> From: Yinjun Zhang <yinjun.zhang@...igine.com>
>
> For nic application firmware, enable the ports' phy state at the
> beginning. And by default its state doesn't change in pace with
> the upper state, unless the ethtool private flag "link_state_detach"
> is turned off by:
>
> ethtool --set-private-flags <netdev> link_state_detach off
>
> With this separation, we're able to keep the VF state up while
> bringing down the PF.
What does it mean "bringing down the PF"?
Thanks
>
> Signed-off-by: Yinjun Zhang <yinjun.zhang@...igine.com>
> Acked-by: Simon Horman <simon.horman@...igine.com>
> Signed-off-by: Louis Peens <louis.peens@...igine.com>
> ---
> .../ethernet/netronome/nfp/nfp_net_ethtool.c | 103 ++++++++++++++++++
> drivers/net/ethernet/netronome/nfp/nic/main.c | 20 ++++
> 2 files changed, 123 insertions(+)
>
> diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
> index dfedb52b7e70..fd4cf865da4a 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
> @@ -841,6 +841,102 @@ static void nfp_net_self_test(struct net_device *netdev, struct ethtool_test *et
> netdev_info(netdev, "Test end\n");
> }
>
> +static bool nfp_pflag_get_link_state_detach(struct net_device *netdev)
> +{
> + struct nfp_port *port = nfp_port_from_netdev(netdev);
> +
> + if (!__nfp_port_get_eth_port(port))
> + return false;
> +
> + return port->eth_forced;
> +}
> +
> +static int nfp_pflag_set_link_state_detach(struct net_device *netdev, bool en)
> +{
> + struct nfp_port *port = nfp_port_from_netdev(netdev);
> + struct nfp_eth_table_port *eth_port;
> +
> + eth_port = __nfp_port_get_eth_port(port);
> + if (!eth_port)
> + return -EOPNOTSUPP;
> +
> + if (!en) {
> + /* When turning link_state_detach off, we need change the lower
> + * phy state if it's different with admin state.
> + * Contrarily, we can leave the lower phy state as it is when
> + * turning the flag on, since it's detached.
> + */
> + int err = nfp_eth_set_configured(port->app->cpp, eth_port->index,
> + netif_running(netdev));
> + if (err && err != -EOPNOTSUPP)
> + return err;
> + }
> +
> + port->eth_forced = en;
> + return 0;
> +}
> +
> +#define DECLARE_NFP_PFLAG(flag) { \
> + .name = #flag, \
> + .get = nfp_pflag_get_##flag, \
> + .set = nfp_pflag_set_##flag, \
> + }
> +
> +static const struct {
> + const char name[ETH_GSTRING_LEN];
> + bool (*get)(struct net_device *netdev);
> + int (*set)(struct net_device *netdev, bool en);
> +} nfp_pflags[] = {
> + DECLARE_NFP_PFLAG(link_state_detach),
> +};
> +
> +#define NFP_PFLAG_MAX ARRAY_SIZE(nfp_pflags)
> +
> +static void nfp_get_pflag_strings(struct net_device *netdev, u8 *data)
> +{
> + for (u32 i = 0; i < NFP_PFLAG_MAX; i++)
> + ethtool_sprintf(&data, nfp_pflags[i].name);
> +}
> +
> +static int nfp_get_pflag_count(struct net_device *netdev)
> +{
> + return NFP_PFLAG_MAX;
> +}
> +
> +static u32 nfp_net_get_pflags(struct net_device *netdev)
> +{
> + u32 pflags = 0;
> +
> + for (u32 i = 0; i < NFP_PFLAG_MAX; i++) {
> + if (nfp_pflags[i].get(netdev))
> + pflags |= BIT(i);
> + }
> +
> + return pflags;
> +}
> +
> +static int nfp_net_set_pflags(struct net_device *netdev, u32 pflags)
> +{
> + u32 changed = nfp_net_get_pflags(netdev) ^ pflags;
> + int err;
> +
> + for (u32 i = 0; i < NFP_PFLAG_MAX; i++) {
> + bool en;
> +
> + if (!(changed & BIT(i)))
> + continue;
> +
> + en = !!(pflags & BIT(i));
> + err = nfp_pflags[i].set(netdev, en);
> + if (err)
> + return err;
> +
> + netdev_info(netdev, "%s is %sabled.", nfp_pflags[i].name, en ? "en" : "dis");
> + }
> +
> + return 0;
> +}
> +
> static unsigned int nfp_vnic_get_sw_stats_count(struct net_device *netdev)
> {
> struct nfp_net *nn = netdev_priv(netdev);
> @@ -1107,6 +1203,9 @@ static void nfp_net_get_strings(struct net_device *netdev,
> case ETH_SS_TEST:
> nfp_get_self_test_strings(netdev, data);
> break;
> + case ETH_SS_PRIV_FLAGS:
> + nfp_get_pflag_strings(netdev, data);
> + break;
> }
> }
>
> @@ -1143,6 +1242,8 @@ static int nfp_net_get_sset_count(struct net_device *netdev, int sset)
> return cnt;
> case ETH_SS_TEST:
> return nfp_get_self_test_count(netdev);
> + case ETH_SS_PRIV_FLAGS:
> + return nfp_get_pflag_count(netdev);
> default:
> return -EOPNOTSUPP;
> }
> @@ -2116,6 +2217,8 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
> .set_fecparam = nfp_port_set_fecparam,
> .get_pauseparam = nfp_port_get_pauseparam,
> .set_phys_id = nfp_net_set_phys_id,
> + .get_priv_flags = nfp_net_get_pflags,
> + .set_priv_flags = nfp_net_set_pflags,
> };
>
> const struct ethtool_ops nfp_port_ethtool_ops = {
> diff --git a/drivers/net/ethernet/netronome/nfp/nic/main.c b/drivers/net/ethernet/netronome/nfp/nic/main.c
> index 9dd5afe37f6e..7d8505c033ee 100644
> --- a/drivers/net/ethernet/netronome/nfp/nic/main.c
> +++ b/drivers/net/ethernet/netronome/nfp/nic/main.c
> @@ -6,6 +6,7 @@
> #include "../nfp_app.h"
> #include "../nfp_main.h"
> #include "../nfp_net.h"
> +#include "../nfp_port.h"
> #include "main.h"
>
> static int nfp_nic_init(struct nfp_app *app)
> @@ -32,11 +33,30 @@ static void nfp_nic_sriov_disable(struct nfp_app *app)
>
> static int nfp_nic_vnic_init(struct nfp_app *app, struct nfp_net *nn)
> {
> + struct nfp_port *port = nn->port;
> +
> + if (port->type == NFP_PORT_PHYS_PORT) {
> + /* Enable PHY state here, and its state doesn't change in
> + * pace with the port upper state by default. The behavior
> + * can be modified by ethtool private flag "link_state_detach".
> + */
> + int err = nfp_eth_set_configured(app->cpp,
> + port->eth_port->index,
> + true);
> + if (err >= 0)
> + port->eth_forced = true;
> + }
> +
> return nfp_nic_dcb_init(nn);
> }
>
> static void nfp_nic_vnic_clean(struct nfp_app *app, struct nfp_net *nn)
> {
> + struct nfp_port *port = nn->port;
> +
> + if (port->type == NFP_PORT_PHYS_PORT)
> + nfp_eth_set_configured(app->cpp, port->eth_port->index, false);
> +
> nfp_nic_dcb_clean(nn);
> }
>
> --
> 2.34.1
>
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