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/*
* Copyright (c) 2009 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include "ath.h"
MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
MODULE_LICENSE("Dual BSD/GPL");
struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
u32 len,
gfp_t gfp_mask)
{
struct sk_buff *skb;
u32 off;
/*
* Cache-line-align. This is important (for the
* 5210 at least) as not doing so causes bogus data
* in rx'd frames.
*/
/* Note: the kernel can allocate a value greater than
* what we ask it to give us. We really only need 4 KB as that
* is this hardware supports and in fact we need at least 3849
* as that is the MAX AMSDU size this hardware supports.
* Unfortunately this means we may get 8 KB here from the
* kernel... and that is actually what is observed on some
* systems :( */
skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
if (skb != NULL) {
off = ((unsigned long) skb->data) % common->cachelsz;
if (off != 0)
skb_reserve(skb, common->cachelsz - off);
} else {
printk(KERN_ERR "skbuff alloc of size %u failed\n", len);
return NULL;
}
return skb;
}
EXPORT_SYMBOL(ath_rxbuf_alloc);
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