> -----Original Message-----
> From: Tetsuya Mukawa [mailto:mukawa at igel.co.jp]
> Sent: Tuesday, March 17, 2015 9:31 AM
> To: dev at dpdk.org
> Cc: Iremonger, Bernard; Richardson, Bruce; Tetsuya Mukawa
> Subject: [PATCH 6/6] eal: Fix interface of pci_map_resource()
>
> The function 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().
> Also, remove redundant error messages from linuxapp.
>
> Signed-off-by: Tetsuya Mukawa <mukawa at igel.co.jp>
> ---
> lib/librte_eal/bsdapp/eal/eal_pci.c | 109
> ++++++++++++++++++------------
> lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 21 +++---
> 2 files changed, 75 insertions(+), 55 deletions(-)
>
> diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c
> b/lib/librte_eal/bsdapp/eal/eal_pci.c
> index 08b91b4..21a3d79 100644
> --- a/lib/librte_eal/bsdapp/eal/eal_pci.c
> +++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
> @@ -100,7 +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]; };
>
> @@ -122,47 +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;
Hi Tetsuya,
Previously pci_map_resource() returned NULL when MAP_FAILED occurred.
It now returns MAP_FAILED.
Where pci_map_resource() is called it should now check for MAP_FAILED instead
of NULL, or else the return value of NULL should be restored.
There is another comment below.
> - }
> -
> - 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); @@ -170,19
> +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;
> }
> @@ -248,24 +246,43 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>
> maps = uio_res->maps;
> for (i = 0, map_idx = 0; i != PCI_MAX_RESOURCE; i++) {
> + int fd;
>
> /* 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 fail0;
> + }
> +
> + /*
> + * 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));
> + goto fail1;
> + }
> +
> /* if matching map is found, then use it */
> offset = i * pagesz;
> - maps[map_idx].offset = offset;
> + mapaddr = pci_map_resource(NULL, fd, (off_t)offset,
> + (size_t)dev->mem_resource[i].len, 0);
> + close(fd);
> + if (mapaddr == NULL)
The check here should be for MAP_FAILED instead of NULL.
Regards,
Bernard.
> + goto fail1;
> +
> maps[map_idx].phaddr = dev->mem_resource[i].phys_addr;
> maps[map_idx].size = dev->mem_resource[i].len;
> - mapaddr = pci_map_resource(NULL, devname, (off_t)offset,
> - (size_t)maps[map_idx].size);
> - if ((maps[map_idx].addr != NULL) || (mapaddr == NULL)) {
> - rte_free(uio_res);
> - return -1;
> - }
> -
> maps[map_idx].addr = mapaddr;
> + maps[map_idx].offset = offset;
> + strcpy(maps[map_idx].path, devname);
> map_idx++;
> dev->mem_resource[i].addr = mapaddr;
> }
> @@ -275,6 +292,12 @@ pci_uio_map_resource(struct rte_pci_device *dev)
> TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
>
> return 0;
> +
> +fail1:
> + rte_free(maps[map_idx].path);
> +fail0:
> + rte_free(uio_res);
> + return -1;
> }
>
> /* Scan one pci sysfs entry, and fill the devices list from it. */ diff --git
> a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> index 5044884..9eeaebb 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;
> }
> @@ -348,8 +342,11 @@ 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 fail0;
> + }
>
> /*
> * open resource file, to mmap it
> --
> 1.9.1
