From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Keyur Chudgar" Subject: skbuff data pointer alignment requirement Date: Thu, 20 Dec 2007 17:12:12 -0800 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_7392_17081095.1198199532408" To: netdev@vger.kernel.org Return-path: Received: from hs-out-0708.google.com ([64.233.178.248]:2077 "EHLO hs-out-2122.google.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753978AbXLUBMO (ORCPT ); Thu, 20 Dec 2007 20:12:14 -0500 Received: by hs-out-2122.google.com with SMTP id 54so92805hsz.5 for ; Thu, 20 Dec 2007 17:12:12 -0800 (PST) Sender: netdev-owner@vger.kernel.org List-ID: ------=_Part_7392_17081095.1198199532408 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi, I would like to ask/suggest some requirements for memory alignment in Linux memory allocation. Is there any way, in Linux kernel socket buffer allocation scheme, particularly the data pointer of the skb and not the skb itself, that, if I want to have the address of allocated data block to be 256 bytes aligned? If there is any way, can you please let me know about it? Based on my review of memory allocation for data pointer of skb, in the __alloc_skb function, file skbuff.c, the data pointer is allocated based on the size specified. It is allocated by kmalloc. The kmalloc is allocating from one of the fixed sized pools, for which the size will be in power of 2. So, for example, if the size specified is 100, I will get the buffer of size 128 bytes, and for which the address will also be 128 bytes aligned. If some hardware requirements, for example is, they need to have 256 bytes aligned address for them to do the DMA, no matter what the packet size is. In this kind of cases, can you guide me what should I do? Is there any way already in Linux I can do this? If there is no way we can do it as of now, can I propose to have some implementation in __alloc_skb function, so that, if one has defined a flag, specifying the minimum alignment requirement for data pointer, kmalloc will give the pointer with the specified alignment? I have done this change in the __alloc_skb function as folloing: #if defined SKB_ADDR_MIN_ALIGN size+=SKB_ADDR_MIN_ALIGN; #endif Just before following code: size = SKB_DATA_ALIGN(size); data = kmalloc_node_track_caller(size + sizeof(struct skb_shared_info), gfp_mask, node); In the above specified situation, I can define SKB_ADDR_MIN_ALIGN = 256 in my Makefile or I don't define it at all if I am okay with default alignment size. Similarly, if one wants to reserve a specific amount of data as soon as the data pointer is allocated in __alloc_skb, he/she can define flag for this. We can add following code in the same function __alloc_skb, #if defined SKB_RESERVE_MIN skb_reserve(skb,SKB_RESERVE_MIN); #endif Just after following code: memset(skb, 0, offsetof(struct sk_buff, truesize)); skb->truesize = size + sizeof(struct sk_buff); atomic_set(&skb->users, 1); skb->head = data; skb->data = data; skb->tail = data; skb->end = data + size; By doing it this way, others will not get impacted if they have not defined these flags. But, people who need to have some requirements like this, they can define these flags. Would you please kindly advice on the suggested implenentation or let me know if you think Linux can already provide some means of fulfilling these requirements? I would really appreciate your feedback. Sincerely, Keyur Chudgar ------=_Part_7392_17081095.1198199532408 Content-Type: text/plain; name=skbuff.c Content-Transfer-Encoding: base64 X-Attachment-Id: f_fag0znn6 Content-Disposition: attachment; filename=skbuff.c LyoKICoJUm91dGluZXMgaGF2aW5nIHRvIGRvIHdpdGggdGhlICdzdHJ1Y3Qgc2tfYnVmZicgbWVt b3J5IGhhbmRsZXJzLgogKgogKglBdXRob3JzOglBbGFuIENveCA8aWlpdGFjQHB5ci5zd2FuLmFj LnVrPgogKgkJCUZsb3JpYW4gTGEgUm9jaGUgPHJ6c2ZsQHJ6LnVuaS1zYi5kZT4KICoKICoJVmVy c2lvbjoJJElkOiBza2J1ZmYuYyx2IDEuOTAgMjAwMS8xMS8wNyAwNTo1NjoxOSBkYXZlbSBFeHAg JAogKgogKglGaXhlczoKICoJCUFsYW4gQ294CToJRml4ZWQgdGhlIHdvcnN0IG9mIHRoZSBsb2Fk CiAqCQkJCQliYWxhbmNlciBidWdzLgogKgkJRGF2ZSBQbGF0dAk6CUludGVycnVwdCBzdGFja2lu ZyBmaXguCiAqCVJpY2hhcmQgS29vaWptYW4JOglUaW1lc3RhbXAgZml4ZXMuCiAqCQlBbGFuIENv eAk6CUNoYW5nZWQgYnVmZmVyIGZvcm1hdC4KICoJCUFsYW4gQ294CToJZGVzdHJ1Y3RvciBob29r IGZvciBBRl9VTklYIGV0Yy4KICoJCUxpbnVzIFRvcnZhbGRzCToJQmV0dGVyIHNrYl9jbG9uZS4K ICoJCUFsYW4gQ294CToJQWRkZWQgc2tiX2NvcHkuCiAqCQlBbGFuIENveAk6CUFkZGVkIGFsbCB0 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