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mem: do not advertise physical address when no hugepages

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When populating a mempool with a virtual memory area, the mempool
library expects to be able to get the physical address of each page.

When started with --no-huge, the physical addresses may not be available
because the pages are not locked in memory. It sometimes returns
RTE_BAD_PHYS_ADDR, which makes the mempool_populate() function to fail.

This was working before the commit cdc242f260e7 ("eal/linux: support
running as unprivileged user"), because rte_mem_virt2phy() was returning
0 instead of RTE_BAD_PHYS_ADDR, which was seen as a valid physical
address.

Since --no-huge is a debug function that breaks the support of physical
drivers, always set physical addresses to RTE_BAD_PHYS_ADDR in memzones
or in rte_mem_virt2phy(), and ensure that mempool won't complain in that
case.

Fixes: cdc242f260e7 ("eal/linux: support running as unprivileged user")
Cc: stable@dpdk.org

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Jan Blunck <jblunck@infradead.org>
This commit is contained in:
Olivier Matz 2017-07-03 12:04:07 +02:00 committed by Thomas Monjalon
parent 5df1c51033
commit ad10c17821
4 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/librte_eal/common/include/rte_malloc.h
View File

@ -329,7 +329,7 @@ rte_malloc_set_limit(const char *type, size_t max);
* @param addr
* Address obtained from a previous rte_malloc call
* @return
* NULL on error
* RTE_BAD_PHYS_ADDR on error
* otherwise return physical address of the buffer
*/
phys_addr_t

4
lib/librte_eal/common/rte_malloc.c
View File

@ -253,6 +253,8 @@ rte_malloc_virt2phy(const void *addr)
{
const struct malloc_elem *elem = malloc_elem_from_data(addr);
if (elem == NULL)
return 0;
return RTE_BAD_PHYS_ADDR;
if (elem->ms->phys_addr == RTE_BAD_PHYS_ADDR)
return RTE_BAD_PHYS_ADDR;
return elem->ms->phys_addr + ((uintptr_t)addr - (uintptr_t)elem->ms->addr);
}

9
lib/librte_eal/linuxapp/eal/eal_memory.c
View File

@ -112,6 +112,13 @@ test_phys_addrs_available(void)
if (rte_xen_dom0_supported())
return;
if (!rte_eal_has_hugepages()) {
RTE_LOG(ERR, EAL,
"Started without hugepages support, physical addresses not available\n");
phys_addrs_available = false;
return;
}
physaddr = rte_mem_virt2phy(&tmp);
if (physaddr == RTE_BAD_PHYS_ADDR) {
RTE_LOG(ERR, EAL,
@ -1054,7 +1061,7 @@ rte_eal_hugepage_init(void)
strerror(errno));
return -1;
}
mcfg->memseg[0].phys_addr = (phys_addr_t)(uintptr_t)addr;
mcfg->memseg[0].phys_addr = RTE_BAD_PHYS_ADDR;
mcfg->memseg[0].addr = addr;
mcfg->memseg[0].hugepage_sz = RTE_PGSIZE_4K;
mcfg->memseg[0].len = internal_config.memory;

2
lib/librte_mempool/rte_mempool.c
View File

@ -476,7 +476,7 @@ rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
/* required for xen_dom0 to get the machine address */
paddr = rte_mem_phy2mch(-1, paddr);
if (paddr == RTE_BAD_PHYS_ADDR) {
if (paddr == RTE_BAD_PHYS_ADDR && rte_eal_has_hugepages()) {
ret = -EINVAL;
goto fail;
}