net: hns3: add handling for xmit skb with recursive fraglist

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Currently hns3 driver only handle the xmit skb with one level of
fraglist skb, add handling for multi level by calling hns3_tx_bd_num()
recursively when calculating bd num and calling hns3_fill_skb_to_desc()
recursively when filling tx desc.

When the skb has a fraglist level of 24, the skb is simply dropped and
stats.max_recursion_level is added to record the error. Move the stat
handling from hns3_nic_net_xmit() to hns3_nic_maybe_stop_tx() in order
to handle different error stat and add the 'max_recursion_level' and
'hw_limitation' stat.

Note that the max recursive level as 24 is chose according to below:
commit 48a1df6533 ("skbuff: return -EMSGSIZE in skb_to_sgvec to
prevent overflow").

And that we are not able to find a testcase to verify the recursive
fraglist case, so Fixes tag is not provided.

Reported-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Yunsheng Lin 2021-03-29 11:57:50 +08:00 • committed by David S. Miller

parent 8fa8655100

commit d5d5e0193e

3 changed files with 78 additions and 41 deletions

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115

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

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2

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

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2

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

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