[dpdk-dev] [PATCH v5 5/5] eal: Fix uio mapping differences between linuxapp and bsdapp

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

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

This patch fixes below.
- bsdapp
 - Use map_id in pci_uio_map_resource().
 - Fix interface of pci_map_resource().
 - Move path variable of mapped_pci_resource structure to pci_map.
- linuxapp
 - Remove redundant error message of linuxapp.

'pci_uio_map_resource()' is implemented in both linuxapp and bsdapp,
but interface is different. The patch fixes the function of bsdapp
to do same as linuxapp. After applying it, file descriptor should be
opened and closed out of pci_map_resource().

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_eal/bsdapp/eal/eal_pci.c       | 118 ++++++++++++++++++------------
 lib/librte_eal/linuxapp/eal/eal_pci_uio.c |  21 +++---
 2 files changed, 80 insertions(+), 59 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 8261e09..06c564f 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -85,6 +85,7 @@
 
 struct pci_map {
 	void *addr;
+	char *path;
 	uint64_t offset;
 	uint64_t size;
 	uint64_t phaddr;
@@ -99,7 +100,7 @@ struct mapped_pci_resource {
 
 	struct rte_pci_addr pci_addr;
 	char path[PATH_MAX];
-	size_t nb_maps;
+	int nb_maps;
 	struct pci_map maps[PCI_MAX_RESOURCE];
 };
 
@@ -121,47 +122,30 @@ pci_unbind_kernel_driver(struct rte_pci_device *dev __rte_unused)
 
 /* map a particular resource from a file */
 static void *
-pci_map_resource(void *requested_addr, const char *devname, off_t offset,
-		 size_t size)
+pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
+		 int additional_flags)
 {
-	int fd;
 	void *mapaddr;
 
-	/*
-	 * open devname, to mmap it
-	 */
-	fd = open(devname, O_RDWR);
-	if (fd < 0) {
-		RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
-			devname, strerror(errno));
-		goto fail;
-	}
-
 	/* Map the PCI memory resource of device */
 	mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
-			MAP_SHARED, fd, offset);
-	close(fd);
-	if (mapaddr == MAP_FAILED ||
-			(requested_addr != NULL && mapaddr != requested_addr)) {
-		RTE_LOG(ERR, EAL, "%s(): cannot mmap(%s(%d), %p, 0x%lx, 0x%lx):"
-			" %s (%p)\n", __func__, devname, fd, requested_addr,
+			MAP_SHARED | additional_flags, fd, offset);
+	if (mapaddr == MAP_FAILED) {
+		RTE_LOG(ERR, EAL,
+			"%s(): cannot mmap(%d, %p, 0x%lx, 0x%lx): %s (%p)\n",
+			__func__, fd, requested_addr,
 			(unsigned long)size, (unsigned long)offset,
 			strerror(errno), mapaddr);
-		goto fail;
-	}
-
-	RTE_LOG(DEBUG, EAL, "  PCI memory mapped at %p\n", mapaddr);
+	} else
+		RTE_LOG(DEBUG, EAL, "  PCI memory mapped at %p\n", mapaddr);
 
 	return mapaddr;
-
-fail:
-	return NULL;
 }
 
 static int
 pci_uio_map_secondary(struct rte_pci_device *dev)
 {
-	size_t i;
+	int i, fd;
 	struct mapped_pci_resource *uio_res;
 	struct mapped_pci_res_list *uio_res_list =
 			RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
@@ -169,19 +153,34 @@ pci_uio_map_secondary(struct rte_pci_device *dev)
 	TAILQ_FOREACH(uio_res, uio_res_list, next) {
 
 		/* skip this element if it doesn't match our PCI address */
-		if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
+		if (rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
 			continue;
 
 		for (i = 0; i != uio_res->nb_maps; i++) {
-			if (pci_map_resource(uio_res->maps[i].addr,
-					     uio_res->path,
-					     (off_t)uio_res->maps[i].offset,
-					     (size_t)uio_res->maps[i].size)
-			    != uio_res->maps[i].addr) {
+			/*
+			 * open devname, to mmap it
+			 */
+			fd = open(uio_res->maps[i].path, O_RDWR);
+			if (fd < 0) {
+				RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
+					uio_res->maps[i].path, strerror(errno));
+				return -1;
+			}
+
+			void *mapaddr = pci_map_resource(uio_res->maps[i].addr,
+					fd, (off_t)uio_res->maps[i].offset,
+					(size_t)uio_res->maps[i].size, 0);
+			if (mapaddr != uio_res->maps[i].addr) {
 				RTE_LOG(ERR, EAL,
-					"Cannot mmap device resource\n");
+						"Cannot mmap device resource "
+						"file %s to address: %p\n",
+						uio_res->maps[i].path,
+						uio_res->maps[i].addr);
+				close(fd);
 				return -1;
 			}
+			/* fd is not needed in slave process, close it */
+			close(fd);
 		}
 		return 0;
 	}
@@ -194,7 +193,7 @@ pci_uio_map_secondary(struct rte_pci_device *dev)
 static int
 pci_uio_map_resource(struct rte_pci_device *dev)
 {
-	int i, j;
+	int i, map_idx;
 	char devname[PATH_MAX]; /* contains the /dev/uioX */
 	void *mapaddr;
 	uint64_t phaddr;
@@ -246,35 +245,60 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 	pagesz = sysconf(_SC_PAGESIZE);
 
 	maps = uio_res->maps;
-	for (i = uio_res->nb_maps = 0; i != PCI_MAX_RESOURCE; i++) {
+	for (i = 0, map_idx = 0; i != PCI_MAX_RESOURCE; i++) {
+		int fd;
 
-		j = uio_res->nb_maps;
 		/* skip empty BAR */
 		if ((phaddr = dev->mem_resource[i].phys_addr) == 0)
 			continue;
 
+		/* allocate memory to keep path */
+		maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
+		if (maps[map_idx].path == NULL) {
+			RTE_LOG(ERR, EAL, "Cannot allocate memory for "
+					"path: %s\n", strerror(errno));
+			goto free_uio_res;
+		}
+
+		/*
+		 * open resource file, to mmap it
+		 */
+		fd = open(devname, O_RDWR);
+		if (fd < 0) {
+			RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
+					devname, strerror(errno));
+			rte_free(maps[map_idx].path);
+			goto free_uio_res;
+		}
+
 		/* if matching map is found, then use it */
 		offset = i * pagesz;
-		maps[j].offset = offset;
-		maps[j].phaddr = dev->mem_resource[i].phys_addr;
-		maps[j].size = dev->mem_resource[i].len;
-		if (maps[j].addr != NULL ||
-		    (mapaddr = pci_map_resource(NULL, devname, (off_t)offset,
-						(size_t)maps[j].size)
-		    ) == NULL) {
+		mapaddr = pci_map_resource(NULL, fd, (off_t)offset,
+					(size_t)dev->mem_resource[i].len, 0);
+		close(fd);
+		if (mapaddr == MAP_FAILED) {
+			rte_free(maps[map_idx].path);
 			goto free_uio_res;
 		}
 
-		maps[j].addr = mapaddr;
-		uio_res->nb_maps++;
+		maps[map_idx].phaddr = dev->mem_resource[i].phys_addr;
+		maps[map_idx].size = dev->mem_resource[i].len;
+		maps[map_idx].addr = mapaddr;
+		maps[map_idx].offset = offset;
+		strcpy(maps[map_idx].path, devname);
+		map_idx++;
 		dev->mem_resource[i].addr = mapaddr;
 	}
 
+	uio_res->nb_maps = map_idx;
+
 	TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
 
 	return 0;
 
 free_uio_res:
+	for (i = 0; i < map_idx; i++)
+		rte_free(maps[i].path);
 	rte_free(uio_res);
 close_fd:
 	close(dev->intr_handle.fd);
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
index 2dd83d3..98f4847 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
@@ -116,17 +116,11 @@ pci_uio_map_secondary(struct rte_pci_device *dev)
 					fd, (off_t)uio_res->maps[i].offset,
 					(size_t)uio_res->maps[i].size, 0);
 			if (mapaddr != uio_res->maps[i].addr) {
-				if (mapaddr == MAP_FAILED)
-					RTE_LOG(ERR, EAL,
-							"Cannot mmap device resource file %s: %s\n",
-							uio_res->maps[i].path,
-							strerror(errno));
-				else
-					RTE_LOG(ERR, EAL,
-							"Cannot mmap device resource file %s to address: %p\n",
-							uio_res->maps[i].path,
-							uio_res->maps[i].addr);
-
+				RTE_LOG(ERR, EAL,
+						"Cannot mmap device resource "
+						"file %s to address: %p\n",
+						uio_res->maps[i].path,
+						uio_res->maps[i].addr);
 				close(fd);
 				return -1;
 			}
@@ -353,8 +347,11 @@ pci_uio_map_resource(struct rte_pci_device *dev)
 
 		/* allocate memory to keep path */
 		maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
-		if (maps[map_idx].path == NULL)
+		if (maps[map_idx].path == NULL) {
+			RTE_LOG(ERR, EAL, "Cannot allocate memory for "
+					"path: %s\n", strerror(errno));
 			goto free_uio_res;
+		}
 
 		/*
 		 * open resource file, to mmap it
-- 
2.1.4