matthias
/
iproute2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

rdma: Add copy-on-fork to get sys command 

The new attribute indicates that the kernel copies DMA pages on fork,
hence fork support through madvise and MADV_DONTFORK is not needed.

If the attribute is not reported (expected on older kernels),
copy-on-fork is disabled.

Example:
$ rdma sys
netns shared copy-on-fork on

Signed-off-by: Gal Pressman <galpress@amazon.com>
Acked-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Gal Pressman 2021-04-29 09:48:03 +03:00 committed by David Ahern
parent 212e2c1d0c
commit bce4247869
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
rdma/sys.c
View File

@ -20,6 +20,7 @@ static const char *netns_modes_str[] = {
static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
bool cof = false;
mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
@ -35,9 +36,17 @@ static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
else
mode_str = "unknown";
print_color_string(PRINT_ANY, COLOR_NONE, "netns", "netns %s\n",
print_color_string(PRINT_ANY, COLOR_NONE, "netns", "netns %s ",
mode_str);
}
if (tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK])
cof = mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK]);
print_color_on_off(PRINT_ANY, COLOR_NONE, "copy-on-fork",
"copy-on-fork %s\n",
cof);
return MNL_CB_OK;
}