[dpdk-dev] [PATCH v8 06/12] eal: Add pci_uio_alloc_resource()

[Tetsuya Mukawa <mukawa@igel.co.jp>]

From: "Tetsuya.Mukawa" <mukawa@igel.co.jp>

This patch adds a new function called pci_uio_alloc_resource().
The function hides how to prepare uio resource in linuxapp and bsdapp.
With the function, pci_uio_map_resource() will be more abstracted.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_eal/bsdapp/eal/eal_pci.c       | 84 +++++++++++++++++---------
 lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 98 +++++++++++++++++++++----------
 2 files changed, 123 insertions(+), 59 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 92d9886..ce0ca07 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -189,28 +189,17 @@ pci_uio_map_secondary(struct rte_pci_device *dev)
 	return 1;
 }
 
-/* map the PCI resource of a PCI device in virtual memory */
 static int
-pci_uio_map_resource(struct rte_pci_device *dev)
+pci_uio_alloc_resource(struct rte_pci_device *dev,
+		struct mapped_pci_resource **uio_res)
 {
-	int i, map_idx = 0;
 	char devname[PATH_MAX]; /* contains the /dev/uioX */
-	void *mapaddr;
-	uint64_t phaddr;
-	uint64_t offset;
-	uint64_t pagesz;
-	struct rte_pci_addr *loc = &dev->addr;
-	struct mapped_pci_resource *uio_res = NULL;
-	struct mapped_pci_res_list *uio_res_list =
-			RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
-	struct pci_map *maps;
+	struct rte_pci_addr *loc;
 
-	dev->intr_handle.fd = -1;
-	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+	if ((dev == NULL) || (uio_res == NULL))
+		return -1;
 
-	/* secondary processes - use already recorded details */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return pci_uio_map_secondary(dev);
+	loc = &dev->addr;
 
 	snprintf(devname, sizeof(devname), "/dev/uio@pci:%u:%u:%u",
 			dev->addr.bus, dev->addr.devid, dev->addr.function);
@@ -231,18 +220,57 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 	dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
 
 	/* allocate the mapping details for secondary processes*/
-	if ((uio_res = rte_zmalloc("UIO_RES", sizeof (*uio_res), 0)) == NULL) {
+	*uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
+	if (*uio_res == NULL) {
 		RTE_LOG(ERR, EAL,
 			"%s(): cannot store uio mmap details\n", __func__);
 		goto error;
 	}
 
-	snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
-	memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
+	snprintf((*uio_res)->path, sizeof((*uio_res)->path), "%s", devname);
+	memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr));
 
+	return 0;
+
+error:
+	if (dev->intr_handle.fd) {
+		close(dev->intr_handle.fd);
+		dev->intr_handle.fd = -1;
+		dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+	}
+	return -1;
+}
+
+/* map the PCI resource of a PCI device in virtual memory */
+static int
+pci_uio_map_resource(struct rte_pci_device *dev)
+{
+	int i, map_idx = 0, ret;
+	char *devname;
+	void *mapaddr;
+	uint64_t phaddr;
+	uint64_t offset;
+	uint64_t pagesz;
+	struct mapped_pci_resource *uio_res = NULL;
+	struct mapped_pci_res_list *uio_res_list =
+		RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
+	struct pci_map *maps;
+
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
+	/* secondary processes - use already recorded details */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return pci_uio_map_secondary(dev);
+
+	/* allocate uio resource */
+	ret = pci_uio_alloc_resource(dev, &uio_res);
+	if ((ret != 0) || (uio_res == NULL))
+		return ret;
 
 	/* Map all BARs */
 	pagesz = sysconf(_SC_PAGESIZE);
+	devname = uio_res->path;
 
 	maps = uio_res->maps;
 	for (i = 0; i != PCI_MAX_RESOURCE; i++) {
@@ -298,13 +326,15 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 error:
 	for (i = 0; i < map_idx; i++)
 		rte_free(maps[i].path);
-	if (uio_res)
-		rte_free(uio_res);
-	if (dev->intr_handle.fd >= 0) {
-		close(dev->intr_handle.fd);
-		dev->intr_handle.fd = -1;
-		dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
-	}
+
+	/* 'uio_res' has valid value here */
+	rte_free(uio_res);
+
+	/* 'fd' has valid value here */
+	close(dev->intr_handle.fd);
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
 	return -1;
 }
 
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
index 38a93c9..f408bd3 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -254,30 +254,20 @@ pci_get_uio_dev(struct rte_pci_device *dev, char *dstbuf,
 	return uio_num;
 }
 
-/* map the PCI resource of a PCI device in virtual memory */
-int
-pci_uio_map_resource(struct rte_pci_device *dev)
+static int
+pci_uio_alloc_resource(struct rte_pci_device *dev,
+		struct mapped_pci_resource **uio_res)
 {
-	int i, map_idx = 0;
 	char dirname[PATH_MAX];
 	char cfgname[PATH_MAX];
 	char devname[PATH_MAX]; /* contains the /dev/uioX */
-	void *mapaddr;
 	int uio_num;
-	uint64_t phaddr;
-	struct rte_pci_addr *loc = &dev->addr;
-	struct mapped_pci_resource *uio_res = NULL;
-	struct mapped_pci_res_list *uio_res_list =
-			RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
-	struct pci_map *maps;
+	struct rte_pci_addr *loc;
 
-	dev->intr_handle.fd = -1;
-	dev->intr_handle.uio_cfg_fd = -1;
-	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+	if ((dev == NULL) || (uio_res == NULL))
+		return -1;
 
-	/* secondary processes - use already recorded details */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return pci_uio_map_secondary(dev);
+	loc = &dev->addr;
 
 	/* find uio resource */
 	uio_num = pci_get_uio_dev(dev, dirname, sizeof(dirname));
@@ -318,15 +308,57 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 	}
 
 	/* allocate the mapping details for secondary processes*/
-	uio_res = rte_zmalloc("UIO_RES", sizeof(*uio_res), 0);
-	if (uio_res == NULL) {
+	*uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
+	if (*uio_res == NULL) {
 		RTE_LOG(ERR, EAL,
 			"%s(): cannot store uio mmap details\n", __func__);
 		goto error;
 	}
 
-	snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
-	memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
+	snprintf((*uio_res)->path, sizeof((*uio_res)->path), "%s", devname);
+	memcpy(&(*uio_res)->pci_addr, &dev->addr, sizeof((*uio_res)->pci_addr));
+
+	return 0;
+
+error:
+	if (dev->intr_handle.uio_cfg_fd >= 0) {
+		close(dev->intr_handle.uio_cfg_fd);
+		dev->intr_handle.uio_cfg_fd = -1;
+	}
+	if (dev->intr_handle.fd >= 0) {
+		close(dev->intr_handle.fd);
+		dev->intr_handle.fd = -1;
+		dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+	}
+	return -1;
+}
+
+/* map the PCI resource of a PCI device in virtual memory */
+int
+pci_uio_map_resource(struct rte_pci_device *dev)
+{
+	int i, map_idx = 0, ret;
+	char devname[PATH_MAX]; /* contains the /dev/uioX */
+	void *mapaddr;
+	uint64_t phaddr;
+	struct rte_pci_addr *loc = &dev->addr;
+	struct mapped_pci_resource *uio_res = NULL;
+	struct mapped_pci_res_list *uio_res_list =
+		RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
+	struct pci_map *maps;
+
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.uio_cfg_fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
+	/* secondary processes - use already recorded details */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+		return pci_uio_map_secondary(dev);
+
+	/* allocate uio resource */
+	ret = pci_uio_alloc_resource(dev, &uio_res);
+	if ((ret != 0) || (uio_res == NULL))
+		return ret;
 
 	/* Map all BARs */
 	maps = uio_res->maps;
@@ -400,17 +432,19 @@ error:
 				(size_t)uio_res->maps[i].size);
 		rte_free(maps[i].path);
 	}
-	if (uio_res)
-		rte_free(uio_res);
-	if (dev->intr_handle.uio_cfg_fd >= 0) {
-		close(dev->intr_handle.uio_cfg_fd);
-		dev->intr_handle.uio_cfg_fd = -1;
-	}
-	if (dev->intr_handle.fd >= 0) {
-		close(dev->intr_handle.fd);
-		dev->intr_handle.fd = -1;
-		dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
-	}
+
+	/* 'uio_res' has valid value here */
+	rte_free(uio_res);
+
+	/* 'uio_cfg_fd' has valid value here */
+	close(dev->intr_handle.uio_cfg_fd);
+	dev->intr_handle.uio_cfg_fd = -1;
+
+	/* 'fd' has valid value here */
+	close(dev->intr_handle.fd);
+	dev->intr_handle.fd = -1;
+	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
 	return -1;
 }
 
-- 
2.1.4