[dpdk-dev] [PATCH] net/ifcvf: remove live migration

[Xiao Wang]

Live migration feature will be based on future development on ifc driver,
including port representor implementation and potential change in QEMU
and vhost user lib.

This patch removes live migration in ifcvf driver, if possible we could
squash this patch into 7c9f28370437 ("net/ifcvf: add ifcvf vdpa driver"),
and remove the live migration segment in that commit log.

Signed-off-by: Xiao Wang <xiao.w.wang at intel.com>
---
 doc/guides/nics/ifcvf.rst    |  4 +---
 drivers/net/ifc/base/ifcvf.c | 31 ------------------------
 drivers/net/ifc/base/ifcvf.h |  6 -----
 drivers/net/ifc/ifcvf_vdpa.c | 57 +++-----------------------------------------
 4 files changed, 4 insertions(+), 94 deletions(-)

diff --git a/doc/guides/nics/ifcvf.rst b/doc/guides/nics/ifcvf.rst
index d7e76353c..48f9adf1d 100644
--- a/doc/guides/nics/ifcvf.rst
+++ b/doc/guides/nics/ifcvf.rst
@@ -8,8 +8,7 @@ The IFCVF vDPA (vhost data path acceleration) driver provides support for the
 Intel FPGA 100G VF (IFCVF). IFCVF's datapath is virtio ring compatible, it
 works as a HW vhost backend which can send/receive packets to/from virtio
 directly by DMA. Besides, it supports dirty page logging and device state
-report/restore. This driver enables its vDPA functionality with live migration
-feature.
+report/restore, this driver enables its vDPA functionality.
 
 
 Pre-Installation Configuration
@@ -71,7 +70,6 @@ Features
 Features of the IFCVF driver are:
 
 - Compatibility with virtio 0.95 and 1.0.
-- Live migration.
 
 
 Prerequisites
diff --git a/drivers/net/ifc/base/ifcvf.c b/drivers/net/ifc/base/ifcvf.c
index bbeed30e8..4b22d9ed1 100644
--- a/drivers/net/ifc/base/ifcvf.c
+++ b/drivers/net/ifc/base/ifcvf.c
@@ -278,37 +278,6 @@ ifcvf_stop_hw(struct ifcvf_hw *hw)
 	ifcvf_reset(hw);
 }
 
-void
-ifcvf_enable_logging(struct ifcvf_hw *hw, u64 log_base, u64 log_size)
-{
-	u8 *lm_cfg;
-
-	lm_cfg = hw->lm_cfg;
-
-	*(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_LOW) =
-		log_base & IFCVF_32_BIT_MASK;
-
-	*(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_HIGH) =
-		(log_base >> 32) & IFCVF_32_BIT_MASK;
-
-	*(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_LOW) =
-		(log_base + log_size) & IFCVF_32_BIT_MASK;
-
-	*(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_HIGH) =
-		((log_base + log_size) >> 32) & IFCVF_32_BIT_MASK;
-
-	*(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_ENABLE_PF;
-}
-
-void
-ifcvf_disable_logging(struct ifcvf_hw *hw)
-{
-	u8 *lm_cfg;
-
-	lm_cfg = hw->lm_cfg;
-	*(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_DISABLE;
-}
-
 void
 ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
 {
diff --git a/drivers/net/ifc/base/ifcvf.h b/drivers/net/ifc/base/ifcvf.h
index 77a2bfa83..badacb615 100644
--- a/drivers/net/ifc/base/ifcvf.h
+++ b/drivers/net/ifc/base/ifcvf.h
@@ -142,12 +142,6 @@ ifcvf_start_hw(struct ifcvf_hw *hw);
 void
 ifcvf_stop_hw(struct ifcvf_hw *hw);
 
-void
-ifcvf_enable_logging(struct ifcvf_hw *hw, u64 log_base, u64 log_size);
-
-void
-ifcvf_disable_logging(struct ifcvf_hw *hw);
-
 void
 ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid);
 
diff --git a/drivers/net/ifc/ifcvf_vdpa.c b/drivers/net/ifc/ifcvf_vdpa.c
index 26d70be18..c6627c23a 100644
--- a/drivers/net/ifc/ifcvf_vdpa.c
+++ b/drivers/net/ifc/ifcvf_vdpa.c
@@ -280,12 +280,8 @@ static void
 vdpa_ifcvf_stop(struct ifcvf_internal *internal)
 {
 	struct ifcvf_hw *hw = &internal->hw;
-	uint32_t i, j;
+	uint32_t i;
 	int vid;
-	uint64_t features, pfn;
-	uint64_t log_base, log_size;
-	uint32_t size;
-	uint8_t *log_buf;
 
 	vid = internal->vid;
 	ifcvf_stop_hw(hw);
@@ -293,24 +289,6 @@ vdpa_ifcvf_stop(struct ifcvf_internal *internal)
 	for (i = 0; i < hw->nr_vring; i++)
 		rte_vhost_set_vring_base(vid, i, hw->vring[i].last_avail_idx,
 				hw->vring[i].last_used_idx);
-
-	rte_vhost_get_negotiated_features(vid, &features);
-	if (RTE_VHOST_NEED_LOG(features)) {
-		ifcvf_disable_logging(hw);
-		rte_vhost_get_log_base(internal->vid, &log_base, &log_size);
-		/*
-		 * IFCVF marks dirty memory pages for only packet buffer,
-		 * SW helps to mark the used ring as dirty after device stops.
-		 */
-		log_buf = (uint8_t *)(uintptr_t)log_base;
-		size = hw->vring[i].size * 8 + 4;
-		for (i = 0; i < hw->nr_vring; i++) {
-			pfn = hw->vring[i].used / PAGE_SIZE;
-			for (j = 0; j <= size / PAGE_SIZE; j++)
-				__sync_fetch_and_or_8(&log_buf[(pfn + j) / 8],
-						 1 << ((pfn + j) % 8));
-		}
-	}
 }
 
 #define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \
@@ -570,34 +548,6 @@ ifcvf_dev_close(int vid)
 	return 0;
 }
 
-static int
-ifcvf_set_features(int vid)
-{
-	uint64_t features;
-	int did;
-	struct internal_list *list;
-	struct ifcvf_internal *internal;
-	uint64_t log_base, log_size;
-
-	did = rte_vhost_get_vdpa_device_id(vid);
-	list = find_internal_resource_by_did(did);
-	if (list == NULL) {
-		DRV_LOG(ERR, "Invalid device id: %d", did);
-		return -1;
-	}
-
-	internal = list->internal;
-	rte_vhost_get_negotiated_features(internal->vid, &features);
-
-	if (RTE_VHOST_NEED_LOG(features)) {
-		rte_vhost_get_log_base(internal->vid, &log_base, &log_size);
-		log_base = rte_mem_virt2phy((void *)(uintptr_t)log_base);
-		ifcvf_enable_logging(&internal->hw, log_base, log_size);
-	}
-
-	return 0;
-}
-
 static int
 ifcvf_get_vfio_group_fd(int vid)
 {
@@ -711,7 +661,7 @@ struct rte_vdpa_dev_ops ifcvf_ops = {
 	.dev_conf = ifcvf_dev_config,
 	.dev_close = ifcvf_dev_close,
 	.set_vring_state = NULL,
-	.set_features = ifcvf_set_features,
+	.set_features = NULL,
 	.migration_done = NULL,
 	.get_vfio_group_fd = ifcvf_get_vfio_group_fd,
 	.get_vfio_device_fd = ifcvf_get_vfio_device_fd,
@@ -746,8 +696,7 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
 	features = ifcvf_get_features(&internal->hw);
 	internal->features = (features &
 		~(1ULL << VIRTIO_F_IOMMU_PLATFORM)) |
-		(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) |
-		(1ULL << VHOST_F_LOG_ALL);
+		(1ULL << VHOST_USER_F_PROTOCOL_FEATURES);
 
 	internal->dev_addr.pci_addr = pci_dev->addr;
 	internal->dev_addr.type = PCI_ADDR;
-- 
2.15.1