netdev - RE: [EXT] Re: [PATCH net-next v3 3/7] octeon_ep: control mailbox for multiple PFs

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Date:   Fri, 17 Feb 2023 17:15:36 +0000
From:   Veerasenareddy Burru <vburru@...vell.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        Sathesh B Edara <sedara@...vell.com>,
        Satananda Burla <sburla@...vell.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: RE: [EXT] Re: [PATCH net-next v3 3/7] octeon_ep: control mailbox for
 multiple PFs



> -----Original Message-----
> From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Sent: Tuesday, February 14, 2023 9:49 AM
> To: Veerasenareddy Burru <vburru@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Abhijit Ayarekar
> <aayarekar@...vell.com>; Sathesh B Edara <sedara@...vell.com>;
> Satananda Burla <sburla@...vell.com>; linux-doc@...r.kernel.org; David S.
> Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>;
> Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>
> Subject: [EXT] Re: [PATCH net-next v3 3/7] octeon_ep: control mailbox for
> multiple PFs
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Mon, Feb 13, 2023 at 09:14:18PM -0800, Veerasenareddy Burru wrote:
> > Add control mailbox support for multiple PFs.
> > Update control mbox base address calculation based on PF function link.
> >
> > Signed-off-by: Veerasenareddy Burru <vburru@...vell.com>
> > Signed-off-by: Abhijit Ayarekar <aayarekar@...vell.com>
> > ---
> > v2 -> v3:
> >  * no change
> >
> > v1 -> v2:
> >  * no change
> >
> >  .../ethernet/marvell/octeon_ep/octep_cn9k_pf.c   | 16
> +++++++++++++++-
> >  1 file changed, 15 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > index f40ebac15a79..c82a1347eed8 100644
> > --- a/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_cn9k_pf.c
> > @@ -13,6 +13,9 @@
> >  #include "octep_main.h"
> >  #include "octep_regs_cn9k_pf.h"
> >
> > +#define CTRL_MBOX_MAX_PF	128
> > +#define CTRL_MBOX_SZ		((size_t)(0x400000 /
> CTRL_MBOX_MAX_PF))
> > +
> >  /* Names of Hardware non-queue generic interrupts */  static char
> > *cn93_non_ioq_msix_names[] = {
> >  	"epf_ire_rint",
> > @@ -199,6 +202,8 @@ static void octep_init_config_cn93_pf(struct
> octep_device *oct)
> >  	struct octep_config *conf = oct->conf;
> >  	struct pci_dev *pdev = oct->pdev;
> >  	u64 val;
> > +	int pos;
> > +	u8 link = 0;
> 
> RCT again
> 

Very sorry for missing these before submitting; Will take care next time.

> >
> >  	/* Read ring configuration:
> >  	 * PF ring count, number of VFs and rings per VF supported @@ -
> 234,7
> > +239,16 @@ static void octep_init_config_cn93_pf(struct octep_device
> *oct)
> >  	conf->msix_cfg.ioq_msix = conf->pf_ring_cfg.active_io_rings;
> >  	conf->msix_cfg.non_ioq_msix_names =
> cn93_non_ioq_msix_names;
> >
> > -	conf->ctrl_mbox_cfg.barmem_addr = (void __iomem *)oct-
> >mmio[2].hw_addr + (0x400000ull * 7);
> > +	pos = pci_find_ext_capability(oct->pdev, PCI_EXT_CAP_ID_SRIOV);
> > +	if (pos) {
> > +		pci_read_config_byte(oct->pdev,
> > +				     pos + PCI_SRIOV_FUNC_LINK,
> > +				     &link);
> > +		link = PCI_DEVFN(PCI_SLOT(oct->pdev->devfn), link);
> > +	}
> > +	conf->ctrl_mbox_cfg.barmem_addr = (void __iomem *)oct-
> >mmio[2].hw_addr +
> > +					   (0x400000ull * 8) +
> 
> can you explain why s/7/8 and was it broken previously?
> 

Thank you for the feedback.
Not broken; It works with 7.
It was an experimental change only; should not have been included in the upstream patch.
Will revert this change in next revision.

> > +					   (link * CTRL_MBOX_SZ);
> >  }
> >
> >  /* Setup registers for a hardware Tx Queue  */
> > --
> > 2.36.0
> >