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Message-Id: <20231121025111.257597-11-yahui.cao@intel.com>
Date: Tue, 21 Nov 2023 02:51:09 +0000
From: Yahui Cao <yahui.cao@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: kvm@...r.kernel.org,
netdev@...r.kernel.org,
lingyu.liu@...el.com,
kevin.tian@...el.com,
madhu.chittim@...el.com,
sridhar.samudrala@...el.com,
alex.williamson@...hat.com,
jgg@...dia.com,
yishaih@...dia.com,
shameerali.kolothum.thodi@...wei.com,
brett.creeley@....com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com
Subject: [PATCH iwl-next v4 10/12] ice: Add device suspend function for migration
From: Lingyu Liu <lingyu.liu@...el.com>
Device suspend handler is called by vfio driver before saving device
state. Typical operation includes stopping TX/RX queue.
Signed-off-by: Lingyu Liu <lingyu.liu@...el.com>
Signed-off-by: Yahui Cao <yahui.cao@...el.com>
---
.../net/ethernet/intel/ice/ice_migration.c | 69 +++++++++++++++++++
include/linux/net/intel/ice_migration.h | 6 ++
2 files changed, 75 insertions(+)
diff --git a/drivers/net/ethernet/intel/ice/ice_migration.c b/drivers/net/ethernet/intel/ice/ice_migration.c
index 082ae2b79f60..a11cd0d3ad3d 100644
--- a/drivers/net/ethernet/intel/ice/ice_migration.c
+++ b/drivers/net/ethernet/intel/ice/ice_migration.c
@@ -2,6 +2,8 @@
/* Copyright (C) 2018-2023 Intel Corporation */
#include "ice.h"
+#include "ice_lib.h"
+#include "ice_fltr.h"
#include "ice_base.h"
#include "ice_txrx_lib.h"
@@ -274,6 +276,73 @@ u32 ice_migration_supported_caps(void)
return VIRTCHNL_VF_MIGRATION_SUPPORT_FEATURE;
}
+/**
+ * ice_migration_suspend_dev - suspend device
+ * @pf: pointer to PF of migration device
+ * @vf_id: VF index of migration device
+ *
+ * Return 0 for success, negative for error
+ */
+int ice_migration_suspend_dev(struct ice_pf *pf, int vf_id)
+{
+ struct device *dev = ice_pf_to_dev(pf);
+ struct ice_vsi *vsi;
+ struct ice_vf *vf;
+ int ret;
+
+ vf = ice_get_vf_by_id(pf, vf_id);
+ if (!vf) {
+ dev_err(dev, "Unable to locate VF from VF ID%d\n", vf_id);
+ return -EINVAL;
+ }
+
+ if (!test_bit(ICE_VF_STATE_QS_ENA, vf->vf_states)) {
+ ret = 0;
+ goto out_put_vf;
+ }
+
+ if (vf->virtchnl_msg_num > VIRTCHNL_MSG_MAX) {
+ dev_err(dev, "SR-IOV live migration disabled on VF %d. Migration buffer exceeded\n",
+ vf->vf_id);
+ ret = -EIO;
+ goto out_put_vf;
+ }
+
+ vsi = ice_get_vf_vsi(vf);
+ if (!vsi) {
+ dev_err(dev, "VF %d VSI is NULL\n", vf->vf_id);
+ ret = -EINVAL;
+ goto out_put_vf;
+ }
+
+ /* Prevent VSI from queuing incoming packets by removing all filters */
+ ice_fltr_remove_all(vsi);
+
+ /* MAC based filter rule is disabled at this point. Set MAC to zero
+ * to keep consistency with VF mac address info shown by ip link
+ */
+ eth_zero_addr(vf->hw_lan_addr);
+ eth_zero_addr(vf->dev_lan_addr);
+
+ ret = ice_vsi_stop_lan_tx_rings(vsi, ICE_NO_RESET, vf->vf_id);
+ if (ret) {
+ dev_err(dev, "VF %d failed to stop tx rings\n", vf->vf_id);
+ ret = -EIO;
+ goto out_put_vf;
+ }
+ ret = ice_vsi_stop_all_rx_rings(vsi);
+ if (ret) {
+ dev_err(dev, "VF %d failed to stop rx rings\n", vf->vf_id);
+ ret = -EIO;
+ goto out_put_vf;
+ }
+
+out_put_vf:
+ ice_put_vf(vf);
+ return ret;
+}
+EXPORT_SYMBOL(ice_migration_suspend_dev);
+
/**
* ice_migration_save_rx_head - save rx head into device state buffer
* @vf: pointer to VF structure
diff --git a/include/linux/net/intel/ice_migration.h b/include/linux/net/intel/ice_migration.h
index a142b78283a8..47f46dca07ae 100644
--- a/include/linux/net/intel/ice_migration.h
+++ b/include/linux/net/intel/ice_migration.h
@@ -14,6 +14,7 @@ int ice_migration_save_devstate(struct ice_pf *pf, int vf_id,
u8 *buf, u64 buf_sz);
int ice_migration_load_devstate(struct ice_pf *pf, int vf_id,
const u8 *buf, u64 buf_sz);
+int ice_migration_suspend_dev(struct ice_pf *pf, int vf_id);
#else
static inline struct ice_pf *ice_migration_get_pf(struct pci_dev *pdev)
{
@@ -37,6 +38,11 @@ static inline int ice_migration_load_devstate(struct ice_pf *pf, int vf_id,
{
return 0;
}
+
+static inline int ice_migration_suspend_dev(struct ice_pf *pf, int vf_id)
+{
+ return 0;
+}
#endif /* CONFIG_ICE_VFIO_PCI */
#endif /* _ICE_MIGRATION_H_ */
--
2.34.1
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