Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / drivers / net / ath / ath_main.c

diff --git a/qemu/roms/ipxe/src/drivers/net/ath/ath_main.c b/qemu/roms/ipxe/src/drivers/net/ath/ath_main.c
new file mode 100644 (file)
index 0000000..85d159a
--- /dev/null
+++ b/qemu/roms/ipxe/src/drivers/net/ath/ath_main.c
@@ -0,0 +1,59 @@
+/*
+ * 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;
+}