netdev - Re: [PATCH 2/2] net: add driver for Netronome NFP4000/NFP6000 NIC VFs

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Date:	Mon, 26 Oct 2015 18:23:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jakub.kicinski@...ronome.com
Cc:	netdev@...r.kernel.org, rolf.neugebauer@...ronome.com,
	jason.mcmullan@...ronome.com, simon.horman@...ronome.com
Subject: Re: [PATCH 2/2] net: add driver for Netronome NFP4000/NFP6000 NIC
 VFs

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Fri, 23 Oct 2015 19:58:11 +0100

> +struct nfp_net_tx_buf {
> +	struct sk_buff *skb;
> +	dma_addr_t dma_addr;
> +	short int fidx;
> +	u16 pkt_cnt;
> +	u32 real_len;
> +};

This packs very poorly, and has a lot of padding holes.  Better ordering
would be:

struct nfp_net_tx_buf {
	struct sk_buff *skb;
	dma_addr_t dma_addr;
	u32 real_len;
	short int fidx;
	u16 pkt_cnt;
};

You really should audit the most core datastructures in this driver
for the same problem.
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