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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023, Intel Corporation. */
#include "ice.h"
#include "ice_lib.h"
#include "ice_irq.h"
/**
* 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)
{
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, i;
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);
}
pf->msix_entries = devm_kcalloc(dev, v_wanted,
sizeof(*pf->msix_entries), GFP_KERNEL);
if (!pf->msix_entries) {
err = -ENOMEM;
goto exit_err;
}
for (i = 0; i < v_wanted; i++)
pf->msix_entries[i].entry = i;
/* actually reserve the vectors */
v_actual = pci_enable_msix_range(pf->pdev, pf->msix_entries,
ICE_MIN_MSIX, v_wanted);
if (v_actual < 0) {
dev_err(dev, "unable to reserve MSI-X vectors\n");
err = v_actual;
goto msix_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_disable_msix(pf->pdev);
err = -ERANGE;
goto msix_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;
msix_err:
devm_kfree(dev, pf->msix_entries);
exit_err:
pf->num_rdma_msix = 0;
pf->num_lan_msix = 0;
return err;
}
/**
* ice_dis_msix - Disable MSI-X interrupt setup in OS
* @pf: board private structure
*/
static void ice_dis_msix(struct ice_pf *pf)
{
pci_disable_msix(pf->pdev);
devm_kfree(ice_pf_to_dev(pf), pf->msix_entries);
pf->msix_entries = NULL;
}
/**
* ice_clear_interrupt_scheme - Undo things done by ice_init_interrupt_scheme
* @pf: board private structure
*/
void ice_clear_interrupt_scheme(struct ice_pf *pf)
{
ice_dis_msix(pf);
if (pf->irq_tracker) {
devm_kfree(ice_pf_to_dev(pf), pf->irq_tracker);
pf->irq_tracker = NULL;
}
}
/**
* ice_init_interrupt_scheme - Determine proper interrupt scheme
* @pf: board private structure to initialize
*/
int ice_init_interrupt_scheme(struct ice_pf *pf)
{
int vectors;
vectors = ice_ena_msix_range(pf);
if (vectors < 0)
return vectors;
/* set up vector assignment tracking */
pf->irq_tracker = devm_kzalloc(ice_pf_to_dev(pf),
struct_size(pf->irq_tracker, list,
vectors),
GFP_KERNEL);
if (!pf->irq_tracker) {
ice_dis_msix(pf);
return -ENOMEM;
}
/* populate SW interrupts pool with number of OS granted IRQs. */
pf->num_avail_sw_msix = (u16)vectors;
pf->irq_tracker->num_entries = (u16)vectors;
pf->irq_tracker->end = pf->irq_tracker->num_entries;
return 0;
}
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