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tipc: delete the unlikely branch in tipc_aead_encrypt

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When a skb comes to tipc_aead_encrypt(), it's always linear. The
unlikely check 'skb_cloned(skb) && tailen <= skb_tailroom(skb)'
can completely be taken care of in skb_cow_data() by the code
in branch "if (!skb_has_frag_list())".

Also, remove the 'TODO:' annotation, as the pages in skbs are not
writable, see more on commit 3cf4375a09 ("tipc: do not write
skb_shinfo frags when doing decrytion").

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Link: https://lore.kernel.org/r/47a478da0b6095b76e3cbe7a75cbd25d9da1df9a.1637773872.git.lucien.xin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2021-11-24 12:11:12 -05:00 committed by Jakub Kicinski
parent 4e35a4f7db
commit 0c51dffcc8
1 changed files with 4 additions and 15 deletions
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19
net/tipc/crypto.c
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@ -761,21 +761,10 @@ static int tipc_aead_encrypt(struct tipc_aead *aead, struct sk_buff *skb,
skb_tailroom(skb), tailen);
}
if (unlikely(!skb_cloned(skb) && tailen <= skb_tailroom(skb))) {
nsg = 1;
trailer = skb;
} else {
/* TODO: We could avoid skb_cow_data() if skb has no frag_list
* e.g. by skb_fill_page_desc() to add another page to the skb
* with the wanted tailen... However, page skbs look not often,
* so take it easy now!
* Cloned skbs e.g. from link_xmit() seems no choice though :(
*/
nsg = skb_cow_data(skb, tailen, &trailer);
if (unlikely(nsg < 0)) {
pr_err("TX: skb_cow_data() returned %d\n", nsg);
return nsg;
}
nsg = skb_cow_data(skb, tailen, &trailer);
if (unlikely(nsg < 0)) {
pr_err("TX: skb_cow_data() returned %d\n", nsg);
return nsg;
}
pskb_put(skb, trailer, tailen);