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authorGreg Rose <gregory.v.rose@intel.com>2012-02-21 16:54:48 -0500
committerDavid S. Miller <davem@davemloft.net>2012-02-21 16:56:45 -0500
commit115c9b81928360d769a76c632bae62d15206a94a (patch)
treebbbe349bdf3803439cf3a757b9f2a839726348f5 /include/linux/if_link.h
parent84338a6c9dbb6ff3de4749864020f8f25d86fc81 (diff)
rtnetlink: Fix problem with buffer allocation
Implement a new netlink attribute type IFLA_EXT_MASK. The mask is a 32 bit value that can be used to indicate to the kernel that certain extended ifinfo values are requested by the user application. At this time the only mask value defined is RTEXT_FILTER_VF to indicate that the user wants the ifinfo dump to send information about the VFs belonging to the interface. This patch fixes a bug in which certain applications do not have large enough buffers to accommodate the extra information returned by the kernel with large numbers of SR-IOV virtual functions. Those applications will not send the new netlink attribute with the interface info dump request netlink messages so they will not get unexpectedly large request buffers returned by the kernel. Modifies the rtnl_calcit function to traverse the list of net devices and compute the minimum buffer size that can hold the info dumps of all matching devices based upon the filter passed in via the new netlink attribute filter mask. If no filter mask is sent then the buffer allocation defaults to NLMSG_GOODSIZE. With this change it is possible to add yet to be defined netlink attributes to the dump request which should make it fairly extensible in the future. Signed-off-by: Greg Rose <gregory.v.rose@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/if_link.h')
-rw-r--r--include/linux/if_link.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index c52d4b5f872a..4b24ff453aee 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -137,6 +137,7 @@ enum {
137 IFLA_AF_SPEC, 137 IFLA_AF_SPEC,
138 IFLA_GROUP, /* Group the device belongs to */ 138 IFLA_GROUP, /* Group the device belongs to */
139 IFLA_NET_NS_FD, 139 IFLA_NET_NS_FD,
140 IFLA_EXT_MASK, /* Extended info mask, VFs, etc */
140 __IFLA_MAX 141 __IFLA_MAX
141}; 142};
142 143