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net/sched: cls_flower: allocate mask dynamically in fl_change()

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Recent changes (especially 05cd271fd6 ("cls_flower: Support multiple
masks per priority")) in the fl_flow_mask structure grow it and its
current size e.g. on x86_64 with defconfig is 760 bytes and more than
1024 bytes with some debug options enabled. Prior the mentioned commit
its size was 176 bytes (using defconfig on x86_64).
With regard to this fact it's reasonable to allocate this structure
dynamically in fl_change() to reduce its stack size.

v2:
- use kzalloc() instead of kcalloc()

Fixes: 05cd271fd6 ("cls_flower: Support multiple masks per priority")
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Paul Blakey <paulb@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ivan Vecera 2019-01-16 16:53:52 +01:00 committed by David S. Miller
parent 3f1bb6abdf
commit 2cddd20147
1 changed files with 14 additions and 5 deletions
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19
net/sched/cls_flower.c
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@ -1290,17 +1290,23 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
struct cls_fl_head *head = rtnl_dereference(tp->root);
struct cls_fl_filter *fold = *arg;
struct cls_fl_filter *fnew;
struct fl_flow_mask *mask;
struct nlattr **tb;
struct fl_flow_mask mask = {};
int err;
if (!tca[TCA_OPTIONS])
return -EINVAL;
tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
if (!tb)
mask = kzalloc(sizeof(struct fl_flow_mask), GFP_KERNEL);
if (!mask)
return -ENOBUFS;
tb = kcalloc(TCA_FLOWER_MAX + 1, sizeof(struct nlattr *), GFP_KERNEL);
if (!tb) {
err = -ENOBUFS;
goto errout_mask_alloc;
}
err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS],
fl_policy, NULL);
if (err < 0)
@ -1343,12 +1349,12 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
}
}
err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr,
err = fl_set_parms(net, tp, fnew, mask, base, tb, tca[TCA_RATE], ovr,
tp->chain->tmplt_priv, extack);
if (err)
goto errout_idr;
err = fl_check_assign_mask(head, fnew, fold, &mask);
err = fl_check_assign_mask(head, fnew, fold, mask);
if (err)
goto errout_idr;
@ -1392,6 +1398,7 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
}
kfree(tb);
kfree(mask);
return 0;
errout_mask:
@ -1405,6 +1412,8 @@ errout:
kfree(fnew);
errout_tb:
kfree(tb);
errout_mask_alloc:
kfree(mask);
return err;
}