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Date:	Tue, 30 Dec 2014 11:30:55 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Vlad Zolotarov <vladz@...udius-systems.com>
Cc:	netdev <netdev@...r.kernel.org>, gleb@...udius-systems.com,
	avi@...udius-systems.com
Subject: Re: [RFC PATCH net-next 1/5] ixgbe: Add a RETA query command to
 VF-PF channel API

On Tue, 2014-12-30 at 21:28 +0200, Vlad Zolotarov wrote:
> On 12/30/14 21:21, Jeff Kirsher wrote:
> > On Tue, Dec 30, 2014 at 8:30 AM, Vlad Zolotarov
> > <vladz@...udius-systems.com> wrote:
> >> 82599 VFs and PF share the same RSS redirection table (RETA). Therefore we
> >> just return it for all VFs.
> >>
> >> RETA table is an array of 32 registers and the maximum number of registers
> >> that may be delivered in a single VF-PF channel command is 15. Therefore
> >> we will deliver the whole table in 3 steps: 12, 12 and 8 registers in each
> >> step correspondingly. Thus this patch does the following:
> >>
> >>    - Adds a new API version (to specify a new commands set).
> >>    - Adds the IXGBE_VF_GET_RETA_[0,1,2] commands to the VF-PF commands set.
> >>
> >> Signed-off-by: Vlad Zolotarov <vladz@...udius-systems.com>
> >> ---
> >>   drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h   |  6 +++++
> >>   drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 35 ++++++++++++++++++++++++++
> >>   2 files changed, 41 insertions(+)
> >>
> >> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
> >> index a5cb755..c1123d9 100644
> >> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
> >> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h
> >> @@ -73,6 +73,7 @@ enum ixgbe_pfvf_api_rev {
> >>          ixgbe_mbox_api_10,      /* API version 1.0, linux/freebsd VF driver */
> >>          ixgbe_mbox_api_20,      /* API version 2.0, solaris Phase1 VF driver */
> >>          ixgbe_mbox_api_11,      /* API version 1.1, linux/freebsd VF driver */
> >> +       ixgbe_mbox_api_12,      /* API version 1.2, linux/freebsd VF driver */
> >>          /* This value should always be last */
> >>          ixgbe_mbox_api_unknown, /* indicates that API version is not known */
> >>   };
> >> @@ -91,6 +92,11 @@ enum ixgbe_pfvf_api_rev {
> >>   /* mailbox API, version 1.1 VF requests */
> >>   #define IXGBE_VF_GET_QUEUES    0x09 /* get queue configuration */
> >>
> >> +/* mailbox API, version 1.2 VF requests */
> >> +#define IXGBE_VF_GET_RETA_0    0x0a /* get RETA[0..11]  */
> >> +#define IXGBE_VF_GET_RETA_1    0x0b /* get RETA[12..23] */
> >> +#define IXGBE_VF_GET_RETA_2    0x0c /* get RETA[24..31] */
> >> +
> >>   /* GET_QUEUES return data indices within the mailbox */
> >>   #define IXGBE_VF_TX_QUEUES     1       /* number of Tx queues supported */
> >>   #define IXGBE_VF_RX_QUEUES     2       /* number of Rx queues supported */
> >> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> >> index c76ba90..84db1a5 100644
> >> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> >> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> >> @@ -427,6 +427,7 @@ static s32 ixgbe_set_vf_lpe(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
> >>   #endif /* CONFIG_FCOE */
> >>                  switch (adapter->vfinfo[vf].vf_api) {
> >>                  case ixgbe_mbox_api_11:
> >> +               case ixgbe_mbox_api_12:
> >>                          /*
> >>                           * Version 1.1 supports jumbo frames on VFs if PF has
> >>                           * jumbo frames enabled which means legacy VFs are
> >> @@ -894,6 +895,7 @@ static int ixgbe_negotiate_vf_api(struct ixgbe_adapter *adapter,
> >>          switch (api) {
> >>          case ixgbe_mbox_api_10:
> >>          case ixgbe_mbox_api_11:
> >> +       case ixgbe_mbox_api_12:
> >>                  adapter->vfinfo[vf].vf_api = api;
> >>                  return 0;
> >>          default:
> >> @@ -917,6 +919,7 @@ static int ixgbe_get_vf_queues(struct ixgbe_adapter *adapter,
> >>          switch (adapter->vfinfo[vf].vf_api) {
> >>          case ixgbe_mbox_api_20:
> >>          case ixgbe_mbox_api_11:
> >> +       case ixgbe_mbox_api_12:
> >>                  break;
> >>          default:
> >>                  return -1;
> >> @@ -944,6 +947,29 @@ static int ixgbe_get_vf_queues(struct ixgbe_adapter *adapter,
> >>          return 0;
> >>   }
> >>
> >> +static int ixgbe_get_vf_reta(struct ixgbe_adapter *adapter,
> >> +                            u32 *msgbuf, u32 vf, int reta_offset_dw,
> >> +                            size_t dwords)
> >> +{
> >> +       struct ixgbe_hw *hw = &adapter->hw;
> >> +       int i;
> >> +       u32 *reta = &msgbuf[1];
> >> +
> >> +       /* verify the PF is supporting the correct API */
> >> +       switch (adapter->vfinfo[vf].vf_api) {
> >> +       case ixgbe_mbox_api_12:
> >> +               break;
> >> +       default:
> >> +               return -EPERM;
> >> +       }
> > A switch statement is overkill for a single case.  It would be far
> > simpler to just have
> >
> > if (adapter->vfinfo[vf].vf_api != ixgbe_mbox_api_12)
> >          return -EPERM;
> >
> > Later on, if there are multiple API's or future API's that also
> > support this, then we could move to a case statement.
> 
> I thought about it to but decided to make it future-proof. NP. Will make 
> it an "if" in a non-RFC series. Thanks.
> 

Thanks fine, and if you CC me on the non-RFC series, I will pick them up
(and make sure that Greg Rose has a chance to review them).

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