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Message-ID: <20241104121337.129287-4-michal.swiatkowski@linux.intel.com>
Date: Mon, 4 Nov 2024 13:13:31 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
pawel.chmielewski@...el.com,
sridhar.samudrala@...el.com,
jacob.e.keller@...el.com,
pio.raczynski@...il.com,
konrad.knitter@...el.com,
marcin.szycik@...el.com,
wojciech.drewek@...el.com,
nex.sw.ncis.nat.hpm.dev@...el.com,
przemyslaw.kitszel@...el.com,
jiri@...nulli.us,
horms@...nel.org,
David.Laight@...LAB.COM,
pmenzel@...gen.mpg.de,
mschmidt@...hat.com
Subject: [iwl-next v7 3/9] ice: remove splitting MSI-X between features
With dynamic approach to alloc MSI-X there is no sense to statically
split MSI-X between PF features.
Splitting was also calculating needed MSI-X. Move this part to separate
function and use as max value.
Remove ICE_ESWITCH_MSIX, as there is no need for additional MSI-X for
switchdev.
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
---
drivers/net/ethernet/intel/ice/ice.h | 2 -
drivers/net/ethernet/intel/ice/ice_irq.c | 172 +++--------------------
2 files changed, 16 insertions(+), 158 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 5baa36a5a500..bf07d64a58a7 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -98,8 +98,6 @@
#define ICE_MIN_MSIX (ICE_MIN_LAN_TXRX_MSIX + ICE_MIN_LAN_OICR_MSIX)
#define ICE_FDIR_MSIX 2
#define ICE_RDMA_NUM_AEQ_MSIX 4
-#define ICE_MIN_RDMA_MSIX 2
-#define ICE_ESWITCH_MSIX 1
#define ICE_NO_VSI 0xffff
#define ICE_VSI_MAP_CONTIG 0
#define ICE_VSI_MAP_SCATTER 1
diff --git a/drivers/net/ethernet/intel/ice/ice_irq.c b/drivers/net/ethernet/intel/ice/ice_irq.c
index 0659b96b9b8c..4a50a6dc817e 100644
--- a/drivers/net/ethernet/intel/ice/ice_irq.c
+++ b/drivers/net/ethernet/intel/ice/ice_irq.c
@@ -84,155 +84,11 @@ static struct ice_irq_entry *ice_get_irq_res(struct ice_pf *pf, bool dyn_only)
return entry;
}
-/**
- * ice_reduce_msix_usage - Reduce usage of MSI-X vectors
- * @pf: board private structure
- * @v_remain: number of remaining MSI-X vectors to be distributed
- *
- * Reduce the usage of MSI-X vectors when entire request cannot be fulfilled.
- * pf->num_lan_msix and pf->num_rdma_msix values are set based on number of
- * remaining vectors.
- */
-static void ice_reduce_msix_usage(struct ice_pf *pf, int v_remain)
+static int ice_get_default_msix_amount(struct ice_pf *pf)
{
- int v_rdma;
-
- if (!ice_is_rdma_ena(pf)) {
- pf->num_lan_msix = v_remain;
- return;
- }
-
- /* RDMA needs at least 1 interrupt in addition to AEQ MSIX */
- v_rdma = ICE_RDMA_NUM_AEQ_MSIX + 1;
-
- if (v_remain < ICE_MIN_LAN_TXRX_MSIX + ICE_MIN_RDMA_MSIX) {
- dev_warn(ice_pf_to_dev(pf), "Not enough MSI-X vectors to support RDMA.\n");
- clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);
-
- pf->num_rdma_msix = 0;
- pf->num_lan_msix = ICE_MIN_LAN_TXRX_MSIX;
- } else if ((v_remain < ICE_MIN_LAN_TXRX_MSIX + v_rdma) ||
- (v_remain - v_rdma < v_rdma)) {
- /* Support minimum RDMA and give remaining vectors to LAN MSIX
- */
- pf->num_rdma_msix = ICE_MIN_RDMA_MSIX;
- pf->num_lan_msix = v_remain - ICE_MIN_RDMA_MSIX;
- } else {
- /* Split remaining MSIX with RDMA after accounting for AEQ MSIX
- */
- pf->num_rdma_msix = (v_remain - ICE_RDMA_NUM_AEQ_MSIX) / 2 +
- ICE_RDMA_NUM_AEQ_MSIX;
- pf->num_lan_msix = v_remain - pf->num_rdma_msix;
- }
-}
-
-/**
- * ice_ena_msix_range - Request a range of MSIX vectors from the OS
- * @pf: board private structure
- *
- * Compute the number of MSIX vectors wanted and request from the OS. Adjust
- * device usage if there are not enough vectors. Return the number of vectors
- * reserved or negative on failure.
- */
-static int ice_ena_msix_range(struct ice_pf *pf)
-{
- int num_cpus, hw_num_msix, v_other, v_wanted, v_actual;
- struct device *dev = ice_pf_to_dev(pf);
- int err;
-
- hw_num_msix = pf->hw.func_caps.common_cap.num_msix_vectors;
- num_cpus = num_online_cpus();
-
- /* LAN miscellaneous handler */
- v_other = ICE_MIN_LAN_OICR_MSIX;
-
- /* Flow Director */
- if (test_bit(ICE_FLAG_FD_ENA, pf->flags))
- v_other += ICE_FDIR_MSIX;
-
- /* switchdev */
- v_other += ICE_ESWITCH_MSIX;
-
- v_wanted = v_other;
-
- /* LAN traffic */
- pf->num_lan_msix = num_cpus;
- v_wanted += pf->num_lan_msix;
-
- /* RDMA auxiliary driver */
- if (ice_is_rdma_ena(pf)) {
- pf->num_rdma_msix = num_cpus + ICE_RDMA_NUM_AEQ_MSIX;
- v_wanted += pf->num_rdma_msix;
- }
-
- if (v_wanted > hw_num_msix) {
- int v_remain;
-
- dev_warn(dev, "not enough device MSI-X vectors. wanted = %d, available = %d\n",
- v_wanted, hw_num_msix);
-
- if (hw_num_msix < ICE_MIN_MSIX) {
- err = -ERANGE;
- goto exit_err;
- }
-
- v_remain = hw_num_msix - v_other;
- if (v_remain < ICE_MIN_LAN_TXRX_MSIX) {
- v_other = ICE_MIN_MSIX - ICE_MIN_LAN_TXRX_MSIX;
- v_remain = ICE_MIN_LAN_TXRX_MSIX;
- }
-
- ice_reduce_msix_usage(pf, v_remain);
- v_wanted = pf->num_lan_msix + pf->num_rdma_msix + v_other;
-
- dev_notice(dev, "Reducing request to %d MSI-X vectors for LAN traffic.\n",
- pf->num_lan_msix);
- if (ice_is_rdma_ena(pf))
- dev_notice(dev, "Reducing request to %d MSI-X vectors for RDMA.\n",
- pf->num_rdma_msix);
- }
-
- /* actually reserve the vectors */
- v_actual = pci_alloc_irq_vectors(pf->pdev, ICE_MIN_MSIX, v_wanted,
- PCI_IRQ_MSIX);
- if (v_actual < 0) {
- dev_err(dev, "unable to reserve MSI-X vectors\n");
- err = v_actual;
- goto exit_err;
- }
-
- if (v_actual < v_wanted) {
- dev_warn(dev, "not enough OS MSI-X vectors. requested = %d, obtained = %d\n",
- v_wanted, v_actual);
-
- if (v_actual < ICE_MIN_MSIX) {
- /* error if we can't get minimum vectors */
- pci_free_irq_vectors(pf->pdev);
- err = -ERANGE;
- goto exit_err;
- } else {
- int v_remain = v_actual - v_other;
-
- if (v_remain < ICE_MIN_LAN_TXRX_MSIX)
- v_remain = ICE_MIN_LAN_TXRX_MSIX;
-
- ice_reduce_msix_usage(pf, v_remain);
-
- dev_notice(dev, "Enabled %d MSI-X vectors for LAN traffic.\n",
- pf->num_lan_msix);
-
- if (ice_is_rdma_ena(pf))
- dev_notice(dev, "Enabled %d MSI-X vectors for RDMA.\n",
- pf->num_rdma_msix);
- }
- }
-
- return v_actual;
-
-exit_err:
- pf->num_rdma_msix = 0;
- pf->num_lan_msix = 0;
- return err;
+ return ICE_MIN_LAN_OICR_MSIX + num_online_cpus() +
+ (test_bit(ICE_FLAG_FD_ENA, pf->flags) ? ICE_FDIR_MSIX : 0) +
+ (ice_is_rdma_ena(pf) ? num_online_cpus() + ICE_RDMA_NUM_AEQ_MSIX : 0);
}
/**
@@ -259,17 +115,21 @@ int ice_init_interrupt_scheme(struct ice_pf *pf)
pf->msix.min = ICE_MIN_MSIX;
if (!pf->msix.max)
- pf->msix.max = total_vectors / 2;
-
- vectors = ice_ena_msix_range(pf);
+ pf->msix.max = min(total_vectors,
+ ice_get_default_msix_amount(pf));
- if (vectors < 0)
- return -ENOMEM;
-
- if (pci_msix_can_alloc_dyn(pf->pdev))
+ if (pci_msix_can_alloc_dyn(pf->pdev)) {
+ vectors = pf->msix.min;
max_vectors = total_vectors;
- else
+ } else {
+ vectors = pf->msix.max;
max_vectors = vectors;
+ }
+
+ vectors = pci_alloc_irq_vectors(pf->pdev, pf->msix.min, vectors,
+ PCI_IRQ_MSIX);
+ if (vectors < pf->msix.min)
+ return -ENOMEM;
ice_init_irq_tracker(pf, max_vectors, vectors);
--
2.42.0
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