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Date: Fri, 4 Dec 2020 12:15:03 +0000
From: "Kiyanovski, Arthur" <akiyano@...zon.com>
To: Heiner Kallweit <hkallweit1@...il.com>,
"kuba@...nel.org" <kuba@...nel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>
CC: "Woodhouse, David" <dwmw@...zon.co.uk>,
"Machulsky, Zorik" <zorik@...zon.com>,
"Matushevsky, Alexander" <matua@...zon.com>,
"Bshara, Saeed" <saeedb@...zon.com>,
"Wilson, Matt" <msw@...zon.com>,
"Liguori, Anthony" <aliguori@...zon.com>,
"Bshara, Nafea" <nafea@...zon.com>,
"Tzalik, Guy" <gtzalik@...zon.com>,
"Belgazal, Netanel" <netanel@...zon.com>,
"Saidi, Ali" <alisaidi@...zon.com>,
"Herrenschmidt, Benjamin" <benh@...zon.com>,
"Dagan, Noam" <ndagan@...zon.com>,
"Agroskin, Shay" <shayagr@...zon.com>,
"Jubran, Samih" <sameehj@...zon.com>
Subject: RE: [PATCH V3 net-next 1/9] net: ena: use constant value for net_device
allocation
> -----Original Message-----
> From: Heiner Kallweit <hkallweit1@...il.com>
> Sent: Thursday, December 3, 2020 10:56 PM
> To: Kiyanovski, Arthur <akiyano@...zon.com>; kuba@...nel.org;
> netdev@...r.kernel.org; davem@...emloft.net
> Cc: Woodhouse, David <dwmw@...zon.co.uk>; Machulsky, Zorik
> <zorik@...zon.com>; Matushevsky, Alexander <matua@...zon.com>;
> Bshara, Saeed <saeedb@...zon.com>; Wilson, Matt <msw@...zon.com>;
> Liguori, Anthony <aliguori@...zon.com>; Bshara, Nafea
> <nafea@...zon.com>; Tzalik, Guy <gtzalik@...zon.com>; Belgazal,
> Netanel <netanel@...zon.com>; Saidi, Ali <alisaidi@...zon.com>;
> Herrenschmidt, Benjamin <benh@...zon.com>; Dagan, Noam
> <ndagan@...zon.com>; Agroskin, Shay <shayagr@...zon.com>; Jubran,
> Samih <sameehj@...zon.com>
> Subject: RE: [EXTERNAL] [PATCH V3 net-next 1/9] net: ena: use constant
> value for net_device allocation
>
> CAUTION: This email originated from outside of the organization. Do not click
> links or open attachments unless you can confirm the sender and know the
> content is safe.
>
>
>
> Am 03.12.2020 um 15:38 schrieb Kiyanovski, Arthur:
> >
> >
> >> -----Original Message-----
> >> From: Heiner Kallweit <hkallweit1@...il.com>
> >> Sent: Wednesday, December 2, 2020 11:55 PM
> >> To: Kiyanovski, Arthur <akiyano@...zon.com>; kuba@...nel.org;
> >> netdev@...r.kernel.org
> >> Cc: Woodhouse, David <dwmw@...zon.co.uk>; Machulsky, Zorik
> >> <zorik@...zon.com>; Matushevsky, Alexander <matua@...zon.com>;
> >> Bshara, Saeed <saeedb@...zon.com>; Wilson, Matt
> <msw@...zon.com>;
> >> Liguori, Anthony <aliguori@...zon.com>; Bshara, Nafea
> >> <nafea@...zon.com>; Tzalik, Guy <gtzalik@...zon.com>; Belgazal,
> >> Netanel <netanel@...zon.com>; Saidi, Ali <alisaidi@...zon.com>;
> >> Herrenschmidt, Benjamin <benh@...zon.com>; Dagan, Noam
> >> <ndagan@...zon.com>; Agroskin, Shay <shayagr@...zon.com>;
> Jubran,
> >> Samih <sameehj@...zon.com>
> >> Subject: RE: [EXTERNAL] [PATCH V3 net-next 1/9] net: ena: use
> >> constant value for net_device allocation
> >>
> >> CAUTION: This email originated from outside of the organization. Do
> >> not click links or open attachments unless you can confirm the sender
> >> and know the content is safe.
> >>
> >>
> >>
> >> Am 02.12.2020 um 21:03 schrieb akiyano@...zon.com:
> >>> From: Arthur Kiyanovski <akiyano@...zon.com>
> >>>
> >>> The patch changes the maximum number of RX/TX queues it advertises
> >>> to the kernel (via alloc_etherdev_mq()) from a value received from
> >>> the device to a constant value which is the minimum between 128 and
> >>> the number of CPUs in the system.
> >>>
> >>> By allocating the net_device struct with a constant number of
> >>> queues, the driver is able to allocate it at a much earlier stage,
> >>> before calling any ena_com functions. This would allow to make all
> >>> log prints in ena_com to use netdev_* log functions instead or current
> pr_* ones.
> >>>
> >>
> >> Did you test this? Usually using netdev_* before the net_device is
> >> registered results in quite ugly messages. Therefore there's a number
> >> of patches doing the opposite, replacing netdev_* with dev_* before
> >> register_netdev(). See e.g.
> >> 22148df0d0bd ("r8169: don't use netif_info et al before net_device
> >> has been
> >> registered")
> >
> > Thanks for your comment.
> > Yes we did test it.
> > Please see the discussion which led to this patch in a previous thread here:
> > https://www.mail-archive.com/netdev@vger.kernel.org/msg353590.html
> >
>
> Ah, I see. After reading the mail thread your motivation is clear.
> You accept ugly messages when ena_com functions are called from probe()
> for the sake of better messages when the same ena_com functions are
> called later from other parts of the driver. Maybe an explanation of this
> tradeoff would have been good in the commit message (or a link to the mail
> thread).
Good idea.
Added this explanation to the next version of this patchset.
Thanks!
> >>> Signed-off-by: Shay Agroskin <shayagr@...zon.com>
> >>> Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
> >>> ---
> >>> drivers/net/ethernet/amazon/ena/ena_netdev.c | 46
> >>> ++++++++++----------
> >>> 1 file changed, 23 insertions(+), 23 deletions(-)
> >>>
> >>> diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> >>> b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> >>> index df1884d57d1a..985dea1870b5 100644
> >>> --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
> >>> +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
> >>> @@ -29,6 +29,8 @@ MODULE_LICENSE("GPL");
> >>> /* Time in jiffies before concluding the transmitter is hung. */
> >>> #define TX_TIMEOUT (5 * HZ)
> >>>
> >>> +#define ENA_MAX_RINGS min_t(unsigned int,
> >> ENA_MAX_NUM_IO_QUEUES,
> >>> +num_possible_cpus())
> >>> +
> >>> #define ENA_NAPI_BUDGET 64
> >>>
> >>> #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV |
> NETIF_MSG_PROBE
> >> |
> >>> NETIF_MSG_IFUP | \ @@ -4176,18 +4178,34 @@ static int
> >> ena_probe(struct
> >>> pci_dev *pdev, const struct pci_device_id *ent)
> >>>
> >>> ena_dev->dmadev = &pdev->dev;
> >>>
> >>> + netdev = alloc_etherdev_mq(sizeof(struct ena_adapter),
> >> ENA_MAX_RINGS);
> >>> + if (!netdev) {
> >>> + dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
> >>> + rc = -ENOMEM;
> >>> + goto err_free_region;
> >>> + }
> >>> +
> >>> + SET_NETDEV_DEV(netdev, &pdev->dev);
> >>> + adapter = netdev_priv(netdev);
> >>> + adapter->ena_dev = ena_dev;
> >>> + adapter->netdev = netdev;
> >>> + adapter->pdev = pdev;
> >>> + adapter->msg_enable = netif_msg_init(debug,
> >> DEFAULT_MSG_ENABLE);
> >>> +
> >>> + pci_set_drvdata(pdev, adapter);
> >>> +
> >>> rc = ena_device_init(ena_dev, pdev, &get_feat_ctx, &wd_state);
> >>> if (rc) {
> >>> dev_err(&pdev->dev, "ENA device init failed\n");
> >>> if (rc == -ETIME)
> >>> rc = -EPROBE_DEFER;
> >>> - goto err_free_region;
> >>> + goto err_netdev_destroy;
> >>> }
> >>>
> >>> rc = ena_map_llq_mem_bar(pdev, ena_dev, bars);
> >>> if (rc) {
> >>> dev_err(&pdev->dev, "ENA llq bar mapping failed\n");
> >>> - goto err_free_ena_dev;
> >>> + goto err_device_destroy;
> >>> }
> >>>
> >>> calc_queue_ctx.ena_dev = ena_dev; @@ -4207,26 +4225,8 @@
> >>> static int ena_probe(struct pci_dev *pdev, const struct pci_device_id
> *ent)
> >>> goto err_device_destroy;
> >>> }
> >>>
> >>> - /* dev zeroed in init_etherdev */
> >>> - netdev = alloc_etherdev_mq(sizeof(struct ena_adapter),
> >> max_num_io_queues);
> >>> - if (!netdev) {
> >>> - dev_err(&pdev->dev, "alloc_etherdev_mq failed\n");
> >>> - rc = -ENOMEM;
> >>> - goto err_device_destroy;
> >>> - }
> >>> -
> >>> - SET_NETDEV_DEV(netdev, &pdev->dev);
> >>> -
> >>> - adapter = netdev_priv(netdev);
> >>> - pci_set_drvdata(pdev, adapter);
> >>> -
> >>> - adapter->ena_dev = ena_dev;
> >>> - adapter->netdev = netdev;
> >>> - adapter->pdev = pdev;
> >>> -
> >>> ena_set_conf_feat_params(adapter, &get_feat_ctx);
> >>>
> >>> - adapter->msg_enable = netif_msg_init(debug,
> >> DEFAULT_MSG_ENABLE);
> >>> adapter->reset_reason = ENA_REGS_RESET_NORMAL;
> >>>
> >>> adapter->requested_tx_ring_size =
> >>> calc_queue_ctx.tx_queue_size; @@ -4257,7 +4257,7 @@ static int
> >>> ena_probe(struct pci_dev *pdev, const
> >> struct pci_device_id *ent)
> >>> if (rc) {
> >>> dev_err(&pdev->dev,
> >>> "Failed to query interrupt moderation feature\n");
> >>> - goto err_netdev_destroy;
> >>> + goto err_device_destroy;
> >>> }
> >>> ena_init_io_rings(adapter,
> >>> 0,
> >>> @@ -4335,11 +4335,11 @@ static int ena_probe(struct pci_dev *pdev,
> >> const struct pci_device_id *ent)
> >>> ena_disable_msix(adapter);
> >>> err_worker_destroy:
> >>> del_timer(&adapter->timer_service);
> >>> -err_netdev_destroy:
> >>> - free_netdev(netdev);
> >>> err_device_destroy:
> >>> ena_com_delete_host_info(ena_dev);
> >>> ena_com_admin_destroy(ena_dev);
> >>> +err_netdev_destroy:
> >>> + free_netdev(netdev);
> >>> err_free_region:
> >>> ena_release_bars(ena_dev, pdev);
> >>> err_free_ena_dev:
> >>>
> >
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