[dpdk-dev] [PATCH 6/6] eal: Fix interface of pci_map_resource()
Tetsuya Mukawa
mukawa at igel.co.jp
Tue Mar 24 05:18:31 CET 2015
On 2015/03/20 18:53, Iremonger, Bernard wrote:
>> -----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.
Hi Bernard,
I appreciate for your comment.
Yes it should be. I will fix it.
Regards,
Tetsuya
>
>
>> - }
>> -
>> - 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
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