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From c560900fc16eeac064cc7c43a96c5343fe68ae76 Mon Sep 17 00:00:00 2001
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From: Hangbin Liu <haliu@redhat.com>
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Date: Wed, 8 Nov 2017 14:39:11 +0800
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Subject: [PATCH] iplink: double the buffer size also in iplink_get()
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1380803
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Upstream Status: iproute2.git commit 460c03f3f3cc
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commit 460c03f3f3cc436ff4673d75722ba68a6ec9343d
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Author: Michal Kubecek <mkubecek@suse.cz>
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Date: Fri Sep 1 18:39:16 2017 +0200
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iplink: double the buffer size also in iplink_get()
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Commit 72b365e8e0fd ("libnetlink: Double the dump buffer size") increased
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the buffer size for "ip link show" command to 32 KB to handle NICs with
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large number of VFs. With "dev" filter, a different code path is taken and
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iplink_get() still uses only 16 KB buffer.
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The size of 32768 is not very future-proof as NICs supporting 120-128 VFs
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are already in use so that single RTM_NEWLINK message in the dump can
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exceed 30000 bytes. But it's what rtnl_talk() and rtnl_dump_filter_l() use
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so let's be consistent. Once this proves insufficient, all three sizes
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should be increased.
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Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
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Signed-off-by: Hangbin Liu <haliu@redhat.com>
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---
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ip/iplink.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/ip/iplink.c b/ip/iplink.c
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index 2b2421f9a2281..5afbadf0ce383 100644
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--- a/ip/iplink.c
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+++ b/ip/iplink.c
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@@ -1015,7 +1015,7 @@ int iplink_get(unsigned int flags, char *name, __u32 filt_mask)
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};
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struct {
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struct nlmsghdr n;
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- char buf[16384];
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+ char buf[32768];
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} answer;
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if (name) {
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--
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2.21.0
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