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Date: Fri, 17 Mar 2023 16:48:54 +0530
From: Gautam Dawar <gdawar@....com>
To: Jason Wang <jasowang@...hat.com>,
Gautam Dawar <gautam.dawar@....com>, linux-net-drivers@....com,
Edward Cree <ecree.xilinx@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
eperezma@...hat.com, harpreet.anand@....com, tanuj.kamde@....com,
koushik.dutta@....com
Subject: Re: [PATCH net-next v2 04/14] sfc: evaluate vdpa support based on FW
capability CLIENT_CMD_VF_PROXY
On 3/14/23 14:08, Martin Habets wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>
>
> On Mon, Mar 13, 2023 at 06:09:19PM +0530, Gautam Dawar wrote:
>> On 3/10/23 10:34, Jason Wang wrote:
>>> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
>>>
>>>
>>> On Tue, Mar 7, 2023 at 7:37 PM Gautam Dawar <gautam.dawar@....com> wrote:
>>>> Add and update vdpa_supported field to struct efx_nic to true if
>>>> running Firmware supports CLIENT_CMD_VF_PROXY capability. This is
>>>> required to ensure DMA isolation between MCDI command buffer and guest
>>>> buffers.
>>>>
>>>> Signed-off-by: Gautam Dawar <gautam.dawar@....com>
>>>> ---
>>>> drivers/net/ethernet/sfc/ef100_netdev.c | 26 +++++++++++++++---
>>>> drivers/net/ethernet/sfc/ef100_nic.c | 35 +++++++++----------------
>>>> drivers/net/ethernet/sfc/ef100_nic.h | 6 +++--
>>>> drivers/net/ethernet/sfc/ef100_vdpa.h | 5 ++--
>>>> 4 files changed, 41 insertions(+), 31 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
>>>> index d916877b5a9a..5d93e870d9b7 100644
>>>> --- a/drivers/net/ethernet/sfc/ef100_netdev.c
>>>> +++ b/drivers/net/ethernet/sfc/ef100_netdev.c
>>>> @@ -355,6 +355,28 @@ void ef100_remove_netdev(struct efx_probe_data *probe_data)
>>>> efx->state = STATE_PROBED;
>>>> }
>>>>
>>>> +static void efx_ef100_update_tso_features(struct efx_nic *efx)
>>>> +{
>>>> + struct ef100_nic_data *nic_data = efx->nic_data;
>>>> + struct net_device *net_dev = efx->net_dev;
>>>> + netdev_features_t tso;
>>>> +
>>>> + if (!efx_ef100_has_cap(nic_data->datapath_caps2, TX_TSO_V3))
>>>> + return;
>>>> +
>>>> + tso = NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_PARTIAL |
>>>> + NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM |
>>>> + NETIF_F_GSO_GRE | NETIF_F_GSO_GRE_CSUM;
>>>> +
>>>> + net_dev->features |= tso;
>>>> + net_dev->hw_features |= tso;
>>>> + net_dev->hw_enc_features |= tso;
>>>> + /* EF100 HW can only offload outer checksums if they are UDP,
>>>> + * so for GRE_CSUM we have to use GSO_PARTIAL.
>>>> + */
>>>> + net_dev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
>>>> +}
>>> I don't see a direct relationship between vDPA and the TSO capability.
>>> Is this an independent fix?
>> This isn't actually fixing any issue. This a minor code refactoring that
>> wraps-up updating of the TSO capabilities in a separate function for better
>> readability.
> There definity was an issue here: the vDPA code now needs access to the NIC
> capabilities. For this is should use the efx_ef100_init_datapath_caps below,
> but that was also doing this netdev specific stuff.
> The solution is to split up efx_ef100_init_datapath_caps into a generic API
> that vDPA can use, and this netdev specific API which should not be used by vDPA.
>
> Gautam, you could explain this API split in the description.
Sure, will update the commit description with this information.
Thanks
>
> Martin
>
>>>> +
>>>> int ef100_probe_netdev(struct efx_probe_data *probe_data)
>>>> {
>>>> struct efx_nic *efx = &probe_data->efx;
>>>> @@ -387,9 +409,7 @@ int ef100_probe_netdev(struct efx_probe_data *probe_data)
>>>> ESE_EF100_DP_GZ_TSO_MAX_HDR_NUM_SEGS_DEFAULT);
>>>> efx->mdio.dev = net_dev;
>>>>
>>>> - rc = efx_ef100_init_datapath_caps(efx);
>>>> - if (rc < 0)
>>>> - goto fail;
>>>> + efx_ef100_update_tso_features(efx);
>>>>
>>>> rc = ef100_phy_probe(efx);
>>>> if (rc)
>>>> diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
>>>> index 8cbe5e0f4bdf..ef6e295efcf7 100644
>>>> --- a/drivers/net/ethernet/sfc/ef100_nic.c
>>>> +++ b/drivers/net/ethernet/sfc/ef100_nic.c
>>>> @@ -161,7 +161,7 @@ int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
>>>> return 0;
>>>> }
>>>>
>>>> -int efx_ef100_init_datapath_caps(struct efx_nic *efx)
>>>> +static int efx_ef100_init_datapath_caps(struct efx_nic *efx)
>>>> {
>>>> MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CAPABILITIES_V7_OUT_LEN);
>>>> struct ef100_nic_data *nic_data = efx->nic_data;
>>>> @@ -197,25 +197,15 @@ int efx_ef100_init_datapath_caps(struct efx_nic *efx)
>>>> if (rc)
>>>> return rc;
>>>>
>>>> - if (efx_ef100_has_cap(nic_data->datapath_caps2, TX_TSO_V3)) {
>>>> - struct net_device *net_dev = efx->net_dev;
>>>> - netdev_features_t tso = NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_PARTIAL |
>>>> - NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM |
>>>> - NETIF_F_GSO_GRE | NETIF_F_GSO_GRE_CSUM;
>>>> -
>>>> - net_dev->features |= tso;
>>>> - net_dev->hw_features |= tso;
>>>> - net_dev->hw_enc_features |= tso;
>>>> - /* EF100 HW can only offload outer checksums if they are UDP,
>>>> - * so for GRE_CSUM we have to use GSO_PARTIAL.
>>>> - */
>>>> - net_dev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
>>>> - }
>>>> efx->num_mac_stats = MCDI_WORD(outbuf,
>>>> GET_CAPABILITIES_V4_OUT_MAC_STATS_NUM_STATS);
>>>> netif_dbg(efx, probe, efx->net_dev,
>>>> "firmware reports num_mac_stats = %u\n",
>>>> efx->num_mac_stats);
>>>> +
>>>> + nic_data->vdpa_supported = efx_ef100_has_cap(nic_data->datapath_caps3,
>>>> + CLIENT_CMD_VF_PROXY) &&
>>>> + efx->type->is_vf;
>>>> return 0;
>>>> }
>>>>
>>>> @@ -806,13 +796,6 @@ static char *bar_config_name[] = {
>>>> [EF100_BAR_CONFIG_VDPA] = "vDPA",
>>>> };
>>>>
>>>> -#ifdef CONFIG_SFC_VDPA
>>>> -static bool efx_vdpa_supported(struct efx_nic *efx)
>>>> -{
>>>> - return efx->type->is_vf;
>>>> -}
>>>> -#endif
>>>> -
>>>> int efx_ef100_set_bar_config(struct efx_nic *efx,
>>>> enum ef100_bar_config new_config)
>>>> {
>>>> @@ -828,7 +811,7 @@ int efx_ef100_set_bar_config(struct efx_nic *efx,
>>>>
>>>> #ifdef CONFIG_SFC_VDPA
>>>> /* Current EF100 hardware supports vDPA on VFs only */
>>>> - if (new_config == EF100_BAR_CONFIG_VDPA && !efx_vdpa_supported(efx)) {
>>>> + if (new_config == EF100_BAR_CONFIG_VDPA && !nic_data->vdpa_supported) {
>>>> pci_err(efx->pci_dev, "vdpa over PF not supported : %s",
>>>> efx->name);
>>>> return -EOPNOTSUPP;
>>>> @@ -1208,6 +1191,12 @@ static int ef100_probe_main(struct efx_nic *efx)
>>>> goto fail;
>>>> }
>>>>
>>>> + rc = efx_ef100_init_datapath_caps(efx);
>>>> + if (rc) {
>>>> + pci_info(efx->pci_dev, "Unable to initialize datapath caps\n");
>>>> + goto fail;
>>>> + }
>>>> +
>>>> return 0;
>>>> fail:
>>>> return rc;
>>>> diff --git a/drivers/net/ethernet/sfc/ef100_nic.h b/drivers/net/ethernet/sfc/ef100_nic.h
>>>> index 4562982f2965..117a73d0795c 100644
>>>> --- a/drivers/net/ethernet/sfc/ef100_nic.h
>>>> +++ b/drivers/net/ethernet/sfc/ef100_nic.h
>>>> @@ -76,6 +76,9 @@ struct ef100_nic_data {
>>>> u32 datapath_caps3;
>>>> unsigned int pf_index;
>>>> u16 warm_boot_count;
>>>> +#ifdef CONFIG_SFC_VDPA
>>>> + bool vdpa_supported; /* true if vdpa is supported on this PCIe FN */
>>>> +#endif
>>>> u8 port_id[ETH_ALEN];
>>>> DECLARE_BITMAP(evq_phases, EFX_MAX_CHANNELS);
>>>> enum ef100_bar_config bar_config;
>>>> @@ -95,9 +98,8 @@ struct ef100_nic_data {
>>>> };
>>>>
>>>> #define efx_ef100_has_cap(caps, flag) \
>>>> - (!!((caps) & BIT_ULL(MC_CMD_GET_CAPABILITIES_V4_OUT_ ## flag ## _LBN)))
>>>> + (!!((caps) & BIT_ULL(MC_CMD_GET_CAPABILITIES_V7_OUT_ ## flag ## _LBN)))
>>>>
>>>> -int efx_ef100_init_datapath_caps(struct efx_nic *efx);
>>>> int ef100_phy_probe(struct efx_nic *efx);
>>>> int ef100_filter_table_probe(struct efx_nic *efx);
>>>>
>>>> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
>>>> index f6564448d0c7..90062fd8a25d 100644
>>>> --- a/drivers/net/ethernet/sfc/ef100_vdpa.h
>>>> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
>>>> @@ -1,7 +1,6 @@
>>>> /* SPDX-License-Identifier: GPL-2.0 */
>>>> -/* Driver for Xilinx network controllers and boards
>>>> - * Copyright (C) 2020-2022, Xilinx, Inc.
>>>> - * Copyright (C) 2022, Advanced Micro Devices, Inc.
>>>> +/* Driver for AMD network controllers and boards
>>>> + * Copyright (C) 2023, Advanced Micro Devices, Inc.
>>> Let's fix this in the patch that introduces this.
>> Sure, will fix.
>>
>> Thanks
>>
>>> Thanks
>>>
>>>
>>>
>>>> *
>>>> * This program is free software; you can redistribute it and/or modify it
>>>> * under the terms of the GNU General Public License version 2 as published
>>>> --
>>>> 2.30.1
>>>>
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