[dpdk-dev] [PATCH 2/5] enic: fix device to work with Xen DOM0

[Stephen Hemminger <stephen@networkplumber.org>]

It is possible to passthrough a PCI device when running in Xen
Paravirt mode. The device driver has to accomodate by using
memory zones differently. This patch models the memory allocation
for ENIC device based on changes already done for ixgbe and igb.

Build tested only; has not been tested on ENIC hardware.
---
v2 -- this patch is added

 lib/librte_pmd_enic/enic_main.c     | 19 ++++++++++++++++---
 lib/librte_pmd_enic/vnic/vnic_dev.c | 19 +++++++++++++++----
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/lib/librte_pmd_enic/enic_main.c b/lib/librte_pmd_enic/enic_main.c
index 48fdca2..0be5172 100644
--- a/lib/librte_pmd_enic/enic_main.c
+++ b/lib/librte_pmd_enic/enic_main.c
@@ -537,8 +537,14 @@ enic_alloc_consistent(__rte_unused void *priv, size_t size,
 	const struct rte_memzone *rz;
 	*dma_handle = 0;
 
-	rz = rte_memzone_reserve_aligned((const char *)name,
-		size, 0, 0, ENIC_ALIGN);
+#ifdef RTE_LIBRTE_XEN_DOM0
+	if (is_xen_dom0_supported())
+		rz = rte_memzone_reserve_bounded((char *)name, size,
+					 0, 0, ENIC_ALIGN, RTE_PGSIZE_2M);
+	else
+#endif	
+		rz = rte_memzone_reserve_aligned((char *)name, size,
+					 0, 0, ENIC_ALIGN);
 	if (!rz) {
 		pr_err("%s : Failed to allocate memory requested for %s",
 			__func__, name);
@@ -546,7 +552,14 @@ enic_alloc_consistent(__rte_unused void *priv, size_t size,
 	}
 
 	vaddr = rz->addr;
-	*dma_handle = (dma_addr_t)rz->phys_addr;
+
+#ifdef RTE_LIBRTE_XEN_DOM0
+	if (is_xen_dom0_supported())
+		*dma_handle = rte_mem_phy2mch(rz->memseg_id,
+					      rz->phys_addr);
+	else
+#endif
+		*dma_handle = (dma_addr_t)rz->phys_addr;
 
 	return vaddr;
 }
diff --git a/lib/librte_pmd_enic/vnic/vnic_dev.c b/lib/librte_pmd_enic/vnic/vnic_dev.c
index 6407994..e660aaf 100644
--- a/lib/librte_pmd_enic/vnic/vnic_dev.c
+++ b/lib/librte_pmd_enic/vnic/vnic_dev.c
@@ -276,9 +276,14 @@ int vnic_dev_alloc_desc_ring(__attribute__((unused)) struct vnic_dev *vdev,
 
 	vnic_dev_desc_ring_size(ring, desc_count, desc_size);
 
-	rz = rte_memzone_reserve_aligned(z_name,
-		ring->size_unaligned, socket_id,
-		0, ENIC_ALIGN);
+#ifdef RTE_LIBRTE_XEN_DOM0
+	if (is_xen_dom0_supported())
+		rz = rte_memzone_reserve_bounded(z_name, ring->size_unaligned,
+					 socket_id, 0, ENIC_ALIGN, RTE_PGSIZE_2M);
+	else
+#endif
+		rz = rte_memzone_reserve_aligned(z_name, ring->size_unaligned,
+					 socket_id, 0, ENIC_ALIGN);
 	if (!rz) {
 		pr_err("Failed to allocate ring (size=%d), aborting\n",
 			(int)ring->size);
@@ -292,7 +297,13 @@ int vnic_dev_alloc_desc_ring(__attribute__((unused)) struct vnic_dev *vdev,
 		return -ENOMEM;
 	}
 
-	ring->base_addr_unaligned = (dma_addr_t)rz->phys_addr;
+#ifdef RTE_LIBRTE_XEN_DOM0
+	if (is_xen_dom0_supported())
+		ring->base_addr_unaligned = rte_mem_phy2mch(rz->memseg_id,
+							    rz->phys_addr);
+	else
+#endif
+		ring->base_addr_unaligned = (dma_addr_t)rz->phys_addr;
 
 	ring->base_addr = ALIGN(ring->base_addr_unaligned,
 		ring->base_align);
-- 
2.1.4