[dpdk-dev] [PATCH v2 09/16] vfio: generalize pci_vfio_get_group_no

[Jan Viktorin <viktorin@rehivetech.com>]

Generalize the pci_vfio_get_group_no to not be PCI-specific. Move the general
implementation to the eal_vfio.c as vfio_get_group_no and leave the original
pci_vfio_get_group_no being a wrapper around this to preserve compilation
issues. The pci_vfio_get_group_no function will be removed later.

Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
---
 lib/librte_eal/linuxapp/eal/eal_pci_vfio.c | 38 +-------------------------
 lib/librte_eal/linuxapp/eal/eal_vfio.c     | 43 ++++++++++++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/eal_vfio.h     |  7 +++++
 3 files changed, 51 insertions(+), 37 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
index 33c11a1..2b3dd2e 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
@@ -401,43 +401,7 @@ pci_vfio_get_group_fd(int iommu_group_no)
 static int
 pci_vfio_get_group_no(const char *pci_addr, int *iommu_group_no)
 {
-	char linkname[PATH_MAX];
-	char filename[PATH_MAX];
-	char *tok[16], *group_tok, *end;
-	int ret;
-
-	memset(linkname, 0, sizeof(linkname));
-	memset(filename, 0, sizeof(filename));
-
-	/* try to find out IOMMU group for this device */
-	snprintf(linkname, sizeof(linkname),
-			 SYSFS_PCI_DEVICES "/%s/iommu_group", pci_addr);
-
-	ret = readlink(linkname, filename, sizeof(filename));
-
-	/* if the link doesn't exist, no VFIO for us */
-	if (ret < 0)
-		return 0;
-
-	ret = rte_strsplit(filename, sizeof(filename),
-			tok, RTE_DIM(tok), '/');
-
-	if (ret <= 0) {
-		RTE_LOG(ERR, EAL, "  %s cannot get IOMMU group\n", pci_addr);
-		return -1;
-	}
-
-	/* IOMMU group is always the last token */
-	errno = 0;
-	group_tok = tok[ret - 1];
-	end = group_tok;
-	*iommu_group_no = strtol(group_tok, &end, 10);
-	if ((end != group_tok && *end != '\0') || errno != 0) {
-		RTE_LOG(ERR, EAL, "  %s error parsing IOMMU number!\n", pci_addr);
-		return -1;
-	}
-
-	return 1;
+	return vfio_get_group_no(SYSFS_PCI_DEVICES, pci_addr, iommu_group_no);
 }
 
 static void
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c
index 5660ddd..2bf810e 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
@@ -165,6 +165,49 @@ vfio_get_container_fd(void)
 }
 
 int
+vfio_get_group_no(const char *sysfs_base,
+		const char *dev_addr, int *iommu_group_no)
+{
+	char linkname[PATH_MAX];
+	char filename[PATH_MAX];
+	char *tok[16], *group_tok, *end;
+	int ret;
+
+	memset(linkname, 0, sizeof(linkname));
+	memset(filename, 0, sizeof(filename));
+
+	/* try to find out IOMMU group for this device */
+	snprintf(linkname, sizeof(linkname),
+			 "%s/%s/iommu_group", sysfs_base, dev_addr);
+
+	ret = readlink(linkname, filename, sizeof(filename));
+
+	/* if the link doesn't exist, no VFIO for us */
+	if (ret < 0)
+		return 0;
+
+	ret = rte_strsplit(filename, sizeof(filename),
+			tok, RTE_DIM(tok), '/');
+
+	if (ret <= 0) {
+		RTE_LOG(ERR, EAL, "  %s cannot get IOMMU group\n", dev_addr);
+		return -1;
+	}
+
+	/* IOMMU group is always the last token */
+	errno = 0;
+	group_tok = tok[ret - 1];
+	end = group_tok;
+	*iommu_group_no = strtol(group_tok, &end, 10);
+	if ((end != group_tok && *end != '\0') || errno != 0) {
+		RTE_LOG(ERR, EAL, "  %s error parsing IOMMU number!\n", dev_addr);
+		return -1;
+	}
+
+	return 1;
+}
+
+int
 vfio_type1_dma_map(int vfio_container_fd)
 {
 	const struct rte_memseg *ms = rte_eal_get_physmem_layout();
diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.h b/lib/librte_eal/linuxapp/eal/eal_vfio.h
index 0fb05a4..619cd6b 100644
--- a/lib/librte_eal/linuxapp/eal/eal_vfio.h
+++ b/lib/librte_eal/linuxapp/eal/eal_vfio.h
@@ -119,6 +119,13 @@ vfio_has_supported_extensions(int vfio_container_fd);
 int
 vfio_get_container_fd(void);
 
+/* parse IOMMU group number for a device
+ * returns 1 on success, -1 for errors, 0 for non-existent group
+ */
+int
+vfio_get_group_no(const char *sysfs_base,
+		const char *dev_addr, int *iommu_group_no);
+
 #define SOCKET_REQ_CONTAINER 0x100
 #define SOCKET_REQ_GROUP 0x200
 #define SOCKET_OK 0x0
-- 
2.8.0