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/*
* Copyright (c) 2009 Atheros Communications Inc.
*
* Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
* Original from Linux kernel 3.0.1
*
* 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 <ipxe/io.h>
#include "ath.h"
struct io_buffer *ath_rxbuf_alloc(struct ath_common *common,
u32 len,
u32 *iob_addr)
{
struct io_buffer *iob;
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 :( */
iob = alloc_iob(len + common->cachelsz - 1);
if (iob != NULL) {
*iob_addr = virt_to_bus(iob->data);
off = ((unsigned long) iob->data) % common->cachelsz;
if (off != 0)
{
iob_reserve(iob, common->cachelsz - off);
*iob_addr += common->cachelsz - off;
}
} else {
DBG("ath: iobuffer alloc of size %d failed\n", len);
return NULL;
}
return iob;
}
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