netdev - Re: [PATCH V1 net] net: ena: fix napi handler misbehavior when the napi budget is zero

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Date:   Mon, 09 Dec 2019 10:34:58 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     netanel@...zon.com
Cc:     netdev@...r.kernel.org, dwmw@...zon.com, zorik@...zon.com,
        matua@...zon.com, saeedb@...zon.com, msw@...zon.com,
        aliguori@...zon.com, nafea@...zon.com, gtzalik@...zon.com,
        alisaidi@...zon.com, benh@...zon.com, akiyano@...zon.com
Subject: Re: [PATCH V1 net] net: ena: fix napi handler misbehavior when the
 napi budget is zero

From: Netanel Belgazal <netanel@...zon.com>
Date: Sun, 8 Dec 2019 17:30:26 +0000

> In netpoll the napi handler could be called with budget equal to zero.
> Current ENA napi handler doesn't take that into consideration.
> 
> The napi handler handles Rx packets in a do-while loop.
> Currently, the budget check happens only after decrementing the
> budget, therefore the napi handler, in rare cases, could run over
> MAX_INT packets.
> 
> In addition to that, this moves all budget related variables to int
> calculation and stop mixing u32 to avoid ambiguity
> 
> Signed-off-by: Netanel Belgazal <netanel@...zon.com>

Bug fixes need to have an appropriate Fixes: tag.

Please repost with that added, thank you.