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enic: detect SR-IOV VF type from PCI capability

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Read the VF device ID from the SR-IOV PCI capability at probe time to
determine whether the PF is configured for V1, USNIC, or V2 virtual
functions. Store the result in enic->vf_type for use by subsequent
SR-IOV operations.

The VF type is a firmware-configured property (set via UCSM, CIMC,
Intersight etc) that is immutable from the driver's perspective. Only
PFs are probed for this capability; VFs and dynamic vnics skip
detection.

Signed-off-by: Satish Kharat <satishkh@cisco.com>
Link: https://patch.msgid.link/20260401-enic-sriov-v2-prep-v4-3-d5834b2ef1b9@cisco.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Satish Kharat 2026-04-01 08:31:13 -07:00 committed by Jakub Kicinski
parent 803a1b0202
commit 56a4d7a865
2 changed files with 45 additions and 0 deletions
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8
drivers/net/ethernet/cisco/enic/enic.h
View File

@ -225,6 +225,13 @@ struct enic_rq {
struct page_pool *pool;
} ____cacheline_aligned;
enum enic_vf_type {
ENIC_VF_TYPE_NONE,
ENIC_VF_TYPE_V1,
ENIC_VF_TYPE_USNIC,
ENIC_VF_TYPE_V2,
};
/* Per-instance private data structure */
struct enic {
struct net_device *netdev;
@ -252,6 +259,7 @@ struct enic {
#ifdef CONFIG_PCI_IOV
u16 num_vfs;
#endif
enum enic_vf_type vf_type;
spinlock_t enic_api_lock;
bool enic_api_busy;
struct enic_port_profile *pp;

37
drivers/net/ethernet/cisco/enic/enic_main.c
View File

@ -67,6 +67,7 @@
#define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN 0x0044 /* enet dynamic vnic */
#define PCI_DEVICE_ID_CISCO_VIC_ENET_VF 0x0071 /* enet SRIOV VF */
#define PCI_DEVICE_ID_CISCO_VIC_ENET_VF_V2 0x02b7 /* enet SRIOV V2 VF */
#define PCI_DEVICE_ID_CISCO_VIC_ENET_VF_USNIC 0x00cf /* enet USNIC VF */
/* Supported devices */
static const struct pci_device_id enic_id_table[] = {
@ -2621,6 +2622,41 @@ static void enic_iounmap(struct enic *enic)
iounmap(enic->bar[i].vaddr);
}
#ifdef CONFIG_PCI_IOV
static void enic_sriov_detect_vf_type(struct enic *enic)
{
struct pci_dev *pdev = enic->pdev;
int pos;
u16 vf_dev_id;
if (enic_is_sriov_vf(enic) || enic_is_dynamic(enic))
return;
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
if (!pos) {
enic->vf_type = ENIC_VF_TYPE_NONE;
return;
}
pci_read_config_word(pdev, pos + PCI_SRIOV_VF_DID, &vf_dev_id);
switch (vf_dev_id) {
case PCI_DEVICE_ID_CISCO_VIC_ENET_VF:
enic->vf_type = ENIC_VF_TYPE_V1;
break;
case PCI_DEVICE_ID_CISCO_VIC_ENET_VF_USNIC:
enic->vf_type = ENIC_VF_TYPE_USNIC;
break;
case PCI_DEVICE_ID_CISCO_VIC_ENET_VF_V2:
enic->vf_type = ENIC_VF_TYPE_V2;
break;
default:
enic->vf_type = ENIC_VF_TYPE_NONE;
break;
}
}
#endif
static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct device *dev = &pdev->dev;
@ -2734,6 +2770,7 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
num_pps = enic->num_vfs;
}
}
enic_sriov_detect_vf_type(enic);
#endif
/* Allocate structure for port profiles */