From: Eric Dumazet <eric.dumazet@gmail.com>
To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: davem@davemloft.net,
Alexander Duyck <alexander.h.duyck@intel.com>,
netdev@vger.kernel.org, gospo@redhat.com, sassmann@redhat.com
Subject: Re: [net-next 01/11] ixgbe: Support using build_skb in the case that jumbo frames are disabled
Date: Fri, 12 Apr 2013 06:31:05 -0700 [thread overview]
Message-ID: <1365773465.4459.21.camel@edumazet-glaptop> (raw)
In-Reply-To: <1365772204.4459.10.camel@edumazet-glaptop>
On Fri, 2013-04-12 at 06:10 -0700, Eric Dumazet wrote:
> Strange. I feel you overestimate the final skb->truesize
>
> The name 'truesize' is a bit misleading here, as its the size of
> skb->head. A better name would have been frag_size, and you should not
> include in it the struct skb_shared_info overhead because build_skb()
> does it :
>
Oh well, build_skb() does :
size -= SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
so your patch is fine, only the @truesize name is misleading.
> skb->truesize will be set to SKB_TRUESIZE(frag_size)
>
> #define SKB_TRUESIZE(X) ((X) + \
> SKB_DATA_ALIGN(sizeof(struct sk_buff)) + \
> SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
>
>
next prev parent reply other threads:[~2013-04-12 13:31 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-12 11:24 [net-next 00/11][pull request] Intel Wired LAN Driver Updates Jeff Kirsher
2013-04-12 11:24 ` [net-next 01/11] ixgbe: Support using build_skb in the case that jumbo frames are disabled Jeff Kirsher
2013-04-12 13:10 ` Eric Dumazet
2013-04-12 13:31 ` Eric Dumazet [this message]
2013-04-12 22:21 ` Ben Hutchings
2013-04-12 23:50 ` Alexander Duyck
2013-04-12 11:24 ` [net-next 02/11] ixgbe: Mask off check of frag_off as we only want fragment offset Jeff Kirsher
2013-04-12 13:28 ` Eric Dumazet
2013-04-12 13:45 ` Eric Dumazet
2013-04-12 16:38 ` Alexander Duyck
2013-04-12 16:51 ` Eric Dumazet
2013-04-12 18:22 ` Alexander Duyck
2013-04-12 18:44 ` Eric Dumazet
2013-04-12 20:12 ` Alexander Duyck
2013-04-12 20:29 ` Eric Dumazet
2013-04-12 21:05 ` Alexander Duyck
2013-04-12 21:12 ` Eric Dumazet
2013-04-12 21:34 ` Alexander Duyck
2013-04-12 21:40 ` Eric Dumazet
2013-04-12 11:24 ` [net-next 03/11] ixgbe: don't do arithmetic operations on bitmasks Jeff Kirsher
2013-04-12 11:24 ` [net-next 04/11] ixgbe: Drop check for PAGE_SIZE from ixgbe_xmit_frame_ring Jeff Kirsher
2013-04-12 11:24 ` [net-next 05/11] ixgbe: Enable support for recognizing PCI-e Gen3 link speed Jeff Kirsher
2013-04-12 11:24 ` [net-next 06/11] ixgbe: create conversion functions from link_status to bus/speed Jeff Kirsher
2013-04-12 11:24 ` [net-next 07/11] ixgbe: enable devices with internal switch to read pci parent Jeff Kirsher
2013-04-12 11:24 ` [net-next 08/11] ixgbe: walk pci-e bus to find minimum width Jeff Kirsher
2013-04-13 21:28 ` Or Gerlitz
2013-04-15 20:48 ` Keller, Jacob E
2013-04-12 11:24 ` [net-next 09/11] ixgbe: fix MNG FW support when adapter not up Jeff Kirsher
2013-04-12 11:24 ` [net-next 10/11] ixgbe: Fix 1G link WoL Jeff Kirsher
2013-04-12 11:24 ` [net-next 11/11] ixgbe: bump version number Jeff Kirsher
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