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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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