Message-Id: <20241118101630.2936711-1-pawel.chmielewski@intel.com>
Date: Mon, 18 Nov 2024 11:16:30 +0100
From: Pawel Chmielewski <pawel.chmielewski@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: pmenzel@...gen.mpg.de,
	wojciech.drewek@...el.com,
	marcin.szycik@...el.com,
	netdev@...r.kernel.org,
	rafal.romanowski@...el.com,
	konrad.knitter@...el.com,
	horms@...nel.org,
	David.Laight@...LAB.COM,
	nex.sw.ncis.nat.hpm.dev@...el.com,
	pio.raczynski@...il.com,
	sridhar.samudrala@...el.com,
	jacob.e.keller@...el.com,
	jiri@...nulli.us,
	przemyslaw.kitszel@...el.com,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Pawel Chmielewski <pawel.chmielewski@...el.com>
Subject: [PATCH 4/8] ice, irdma: move interrupts code to irdma

From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

Move responsibility of MSI-X requesting for RDMA feature from ice driver
to irdma driver. It is done to allow simple fallback when there is not
enough MSI-X available.

Change amount of MSI-X used for control from 4 to 1, as it isn't needed
to have more than one MSI-X for this purpose.

Reduce the maximum number of interrupts requested by irdma to 64.
This improves the overall utilization of interrupts by the base driver
for systems with a large number of cores.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Pawel Chmielewski <pawel.chmielewski@...el.com>
---
Proposed change for a v8 of original patch:
 - Add a limit of 64 of MSI-X for RDMA, as suggested in [1]

[1]: https://lore.kernel.org/netdev/5eca295e-1675-4779-b0d6-ec8a7550516f@intel.com/
---
 drivers/infiniband/hw/irdma/hw.c         |  2 -
 drivers/infiniband/hw/irdma/main.c       | 50 +++++++++++++++++-
 drivers/infiniband/hw/irdma/main.h       |  4 ++
 drivers/net/ethernet/intel/ice/ice.h     |  1 -
 drivers/net/ethernet/intel/ice/ice_idc.c | 64 ++++++------------------
 drivers/net/ethernet/intel/ice/ice_irq.c |  3 +-
 include/linux/net/intel/iidc.h           |  2 +
 7 files changed, 70 insertions(+), 56 deletions(-)

diff --git a/drivers/infiniband/hw/irdma/hw.c b/drivers/infiniband/hw/irdma/hw.c
index ad50b77282f8..69ce1862eabe 100644
--- a/drivers/infiniband/hw/irdma/hw.c
+++ b/drivers/infiniband/hw/irdma/hw.c
@@ -498,8 +498,6 @@ static int irdma_save_msix_info(struct irdma_pci_f *rf)
 	iw_qvlist->num_vectors = rf->msix_count;
 	if (rf->msix_count <= num_online_cpus())
 		rf->msix_shared = true;
-	else if (rf->msix_count > num_online_cpus() + 1)
-		rf->msix_count = num_online_cpus() + 1;
 
 	pmsix = rf->msix_entries;
 	for (i = 0, ceq_idx = 0; i < rf->msix_count; i++, iw_qvinfo++) {
diff --git a/drivers/infiniband/hw/irdma/main.c b/drivers/infiniband/hw/irdma/main.c
index 3f13200ff71b..f538f4923825 100644
--- a/drivers/infiniband/hw/irdma/main.c
+++ b/drivers/infiniband/hw/irdma/main.c
@@ -206,6 +206,47 @@ static void irdma_lan_unregister_qset(struct irdma_sc_vsi *vsi,
 		ibdev_dbg(&iwdev->ibdev, "WS: LAN free_res for rdma qset failed.\n");
 }
 
+static int irdma_init_interrupts(struct irdma_pci_f *rf, struct ice_pf *pf)
+{
+	int i;
+
+	rf->msix_count = num_online_cpus() + IRDMA_NUM_AEQ_MSIX;
+
+	if (rf->msix_count > IRDMA_MAX_MSIX)
+		rf->msix_count = IRDMA_MAX_MSIX;
+
+	rf->msix_entries = kcalloc(rf->msix_count, sizeof(*rf->msix_entries),
+				   GFP_KERNEL);
+	if (!rf->msix_entries)
+		return -ENOMEM;
+
+	for (i = 0; i < rf->msix_count; i++)
+		if (ice_alloc_rdma_qvector(pf, &rf->msix_entries[i]))
+			break;
+
+	if (i < IRDMA_MIN_MSIX) {
+		for (; i > 0; i--)
+			ice_free_rdma_qvector(pf, &rf->msix_entries[i]);
+
+		kfree(rf->msix_entries);
+		return -ENOMEM;
+	}
+
+	rf->msix_count = i;
+
+	return 0;
+}
+
+static void irdma_deinit_interrupts(struct irdma_pci_f *rf, struct ice_pf *pf)
+{
+	int i;
+
+	for (i = 0; i < rf->msix_count; i++)
+		ice_free_rdma_qvector(pf, &rf->msix_entries[i]);
+
+	kfree(rf->msix_entries);
+}
+
 static void irdma_remove(struct auxiliary_device *aux_dev)
 {
 	struct iidc_auxiliary_dev *iidc_adev = container_of(aux_dev,
@@ -216,6 +257,7 @@ static void irdma_remove(struct auxiliary_device *aux_dev)
 
 	irdma_ib_unregister_device(iwdev);
 	ice_rdma_update_vsi_filter(pf, iwdev->vsi_num, false);
+	irdma_deinit_interrupts(iwdev->rf, pf);
 
 	pr_debug("INIT: Gen2 PF[%d] device remove success\n", PCI_FUNC(pf->pdev->devfn));
 }
@@ -230,9 +272,7 @@ static void irdma_fill_device_info(struct irdma_device *iwdev, struct ice_pf *pf
 	rf->gen_ops.unregister_qset = irdma_lan_unregister_qset;
 	rf->hw.hw_addr = pf->hw.hw_addr;
 	rf->pcidev = pf->pdev;
-	rf->msix_count =  pf->num_rdma_msix;
 	rf->pf_id = pf->hw.pf_id;
-	rf->msix_entries = &pf->msix_entries[pf->rdma_base_vector];
 	rf->default_vsi.vsi_idx = vsi->vsi_num;
 	rf->protocol_used = pf->rdma_mode & IIDC_RDMA_PROTOCOL_ROCEV2 ?
 			    IRDMA_ROCE_PROTOCOL_ONLY : IRDMA_IWARP_PROTOCOL_ONLY;
@@ -281,6 +321,10 @@ static int irdma_probe(struct auxiliary_device *aux_dev, const struct auxiliary_
 	irdma_fill_device_info(iwdev, pf, vsi);
 	rf = iwdev->rf;
 
+	err = irdma_init_interrupts(rf, pf);
+	if (err)
+		goto err_init_interrupts;
+
 	err = irdma_ctrl_init_hw(rf);
 	if (err)
 		goto err_ctrl_init;
@@ -311,6 +355,8 @@ static int irdma_probe(struct auxiliary_device *aux_dev, const struct auxiliary_
 err_rt_init:
 	irdma_ctrl_deinit_hw(rf);
 err_ctrl_init:
+	irdma_deinit_interrupts(rf, pf);
+err_init_interrupts:
 	kfree(iwdev->rf);
 	ib_dealloc_device(&iwdev->ibdev);
 
diff --git a/drivers/infiniband/hw/irdma/main.h b/drivers/infiniband/hw/irdma/main.h
index 9f0ed6e84471..53a20f2dd681 100644
--- a/drivers/infiniband/hw/irdma/main.h
+++ b/drivers/infiniband/hw/irdma/main.h
@@ -117,6 +117,10 @@ extern struct auxiliary_driver i40iw_auxiliary_drv;
 
 #define IRDMA_IRQ_NAME_STR_LEN (64)
 
+#define IRDMA_NUM_AEQ_MSIX	1
+#define IRDMA_MIN_MSIX		2
+#define IRDMA_MAX_MSIX		64
+
 enum init_completion_state {
 	INVALID_STATE = 0,
 	INITIAL_STATE,
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index bde04595b592..71525bf4918e 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -96,7 +96,6 @@
 #define ICE_MIN_LAN_OICR_MSIX	1
 #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_NO_VSI		0xffff
 #define ICE_VSI_MAP_CONTIG	0
 #define ICE_VSI_MAP_SCATTER	1
diff --git a/drivers/net/ethernet/intel/ice/ice_idc.c b/drivers/net/ethernet/intel/ice/ice_idc.c
index 145b27f2a4ce..bab3e81cad5d 100644
--- a/drivers/net/ethernet/intel/ice/ice_idc.c
+++ b/drivers/net/ethernet/intel/ice/ice_idc.c
@@ -228,61 +228,34 @@ void ice_get_qos_params(struct ice_pf *pf, struct iidc_qos_params *qos)
 }
 EXPORT_SYMBOL_GPL(ice_get_qos_params);
 
-/**
- * ice_alloc_rdma_qvectors - Allocate vector resources for RDMA driver
- * @pf: board private structure to initialize
- */
-static int ice_alloc_rdma_qvectors(struct ice_pf *pf)
+int ice_alloc_rdma_qvector(struct ice_pf *pf, struct msix_entry *entry)
 {
-	if (ice_is_rdma_ena(pf)) {
-		int i;
-
-		pf->msix_entries = kcalloc(pf->num_rdma_msix,
-					   sizeof(*pf->msix_entries),
-						  GFP_KERNEL);
-		if (!pf->msix_entries)
-			return -ENOMEM;
+	struct msi_map map = ice_alloc_irq(pf, true);
 
-		/* RDMA is the only user of pf->msix_entries array */
-		pf->rdma_base_vector = 0;
-
-		for (i = 0; i < pf->num_rdma_msix; i++) {
-			struct msix_entry *entry = &pf->msix_entries[i];
-			struct msi_map map;
+	if (map.index < 0)
+		return -ENOMEM;
 
-			map = ice_alloc_irq(pf, false);
-			if (map.index < 0)
-				break;
+	entry->entry = map.index;
+	entry->vector = map.virq;
 
-			entry->entry = map.index;
-			entry->vector = map.virq;
-		}
-	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(ice_alloc_rdma_qvector);
 
 /**
  * ice_free_rdma_qvector - free vector resources reserved for RDMA driver
  * @pf: board private structure to initialize
+ * @entry: MSI-X entry to be removed
  */
-static void ice_free_rdma_qvector(struct ice_pf *pf)
+void ice_free_rdma_qvector(struct ice_pf *pf, struct msix_entry *entry)
 {
-	int i;
-
-	if (!pf->msix_entries)
-		return;
-
-	for (i = 0; i < pf->num_rdma_msix; i++) {
-		struct msi_map map;
+	struct msi_map map;
 
-		map.index = pf->msix_entries[i].entry;
-		map.virq = pf->msix_entries[i].vector;
-		ice_free_irq(pf, map);
-	}
-
-	kfree(pf->msix_entries);
-	pf->msix_entries = NULL;
+	map.index = entry->entry;
+	map.virq = entry->vector;
+	ice_free_irq(pf, map);
 }
+EXPORT_SYMBOL_GPL(ice_free_rdma_qvector);
 
 /**
  * ice_adev_release - function to be mapped to AUX dev's release op
@@ -382,12 +355,6 @@ int ice_init_rdma(struct ice_pf *pf)
 		return -ENOMEM;
 	}
 
-	/* Reserve vector resources */
-	ret = ice_alloc_rdma_qvectors(pf);
-	if (ret < 0) {
-		dev_err(dev, "failed to reserve vectors for RDMA\n");
-		goto err_reserve_rdma_qvector;
-	}
 	pf->rdma_mode |= IIDC_RDMA_PROTOCOL_ROCEV2;
 	ret = ice_plug_aux_dev(pf);
 	if (ret)
@@ -395,8 +362,6 @@ int ice_init_rdma(struct ice_pf *pf)
 	return 0;
 
 err_plug_aux_dev:
-	ice_free_rdma_qvector(pf);
-err_reserve_rdma_qvector:
 	pf->adev = NULL;
 	xa_erase(&ice_aux_id, pf->aux_idx);
 	return ret;
@@ -412,6 +377,5 @@ void ice_deinit_rdma(struct ice_pf *pf)
 		return;
 
 	ice_unplug_aux_dev(pf);
-	ice_free_rdma_qvector(pf);
 	xa_erase(&ice_aux_id, pf->aux_idx);
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_irq.c b/drivers/net/ethernet/intel/ice/ice_irq.c
index 1a7d446ab5f1..80c9ee2e64c1 100644
--- a/drivers/net/ethernet/intel/ice/ice_irq.c
+++ b/drivers/net/ethernet/intel/ice/ice_irq.c
@@ -84,11 +84,12 @@ static struct ice_irq_entry *ice_get_irq_res(struct ice_pf *pf, bool dyn_only)
 	return entry;
 }
 
+#define ICE_RDMA_AEQ_MSIX 1
 static int ice_get_default_msix_amount(struct ice_pf *pf)
 {
 	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);
+	       (ice_is_rdma_ena(pf) ? num_online_cpus() + ICE_RDMA_AEQ_MSIX : 0);
 }
 
 /**
diff --git a/include/linux/net/intel/iidc.h b/include/linux/net/intel/iidc.h
index 1c1332e4df26..13274c3def66 100644
--- a/include/linux/net/intel/iidc.h
+++ b/include/linux/net/intel/iidc.h
@@ -78,6 +78,8 @@ int ice_del_rdma_qset(struct ice_pf *pf, struct iidc_rdma_qset_params *qset);
 int ice_rdma_request_reset(struct ice_pf *pf, enum iidc_reset_type reset_type);
 int ice_rdma_update_vsi_filter(struct ice_pf *pf, u16 vsi_id, bool enable);
 void ice_get_qos_params(struct ice_pf *pf, struct iidc_qos_params *qos);
+int ice_alloc_rdma_qvector(struct ice_pf *pf, struct msix_entry *entry);
+void ice_free_rdma_qvector(struct ice_pf *pf, struct msix_entry *entry);
 
 /* Structure representing auxiliary driver tailored information about the core
  * PCI dev, each auxiliary driver using the IIDC interface will have an
-- 
2.37.3

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