netdev - [net-next 08/14] ice: Allow 2 queue pairs per VF on SR-IOV initialization

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Message-Id: <20200801161802.867645-9-anthony.l.nguyen@intel.com>
Date:   Sat,  1 Aug 2020 09:17:56 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net
Cc:     Brett Creeley <brett.creeley@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com,
        jeffrey.t.kirsher@...el.com, anthony.l.nguyen@...el.com,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: [net-next 08/14] ice: Allow 2 queue pairs per VF on SR-IOV initialization

From: Brett Creeley <brett.creeley@...el.com>

Currently VFs are only allowed to get 16, 4, and 1 queue pair by
default, which require 17, 5, and 2 MSI-X vectors respectively. This
is because each VF needs a MSI-X per data queue and a MSI-X for its
other interrupt. The calculation is based on the number of VFs created,
MSI-X available, and queue pairs available at the time of VF creation.

Unfortunately the values above exclude 2 queue pairs when only 3 MSI-X
are available to each VF based on resource constraints. The current
calculation would default to 2 MSI-X and 1 queue pair. This is a waste
of resources, so fix this by allowing 2 queue pairs per VF when there
are between 2 and 5 MSI-X available per VF.

Signed-off-by: Brett Creeley <brett.creeley@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c | 2 ++
 drivers/net/ethernet/intel/ice/ice_virtchnl_pf.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index 7061730f0f37..cfdd820e9a2a 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -932,6 +932,8 @@ static int ice_set_per_vf_res(struct ice_pf *pf)
 		num_msix_per_vf = ICE_NUM_VF_MSIX_MED;
 	} else if (msix_avail_per_vf >= ICE_NUM_VF_MSIX_SMALL) {
 		num_msix_per_vf = ICE_NUM_VF_MSIX_SMALL;
+	} else if (msix_avail_per_vf >= ICE_NUM_VF_MSIX_MULTIQ_MIN) {
+		num_msix_per_vf = ICE_NUM_VF_MSIX_MULTIQ_MIN;
 	} else if (msix_avail_per_vf >= ICE_MIN_INTR_PER_VF) {
 		num_msix_per_vf = ICE_MIN_INTR_PER_VF;
 	} else {
diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.h b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.h
index 049e0b583383..0f519fba3770 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.h
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.h
@@ -32,6 +32,7 @@
 #define ICE_MAX_RSS_QS_PER_VF		16
 #define ICE_NUM_VF_MSIX_MED		17
 #define ICE_NUM_VF_MSIX_SMALL		5
+#define ICE_NUM_VF_MSIX_MULTIQ_MIN	3
 #define ICE_MIN_INTR_PER_VF		(ICE_MIN_QS_PER_VF + 1)
 #define ICE_MAX_VF_RESET_TRIES		40
 #define ICE_MAX_VF_RESET_SLEEP_MS	20
-- 
2.26.2