1 files changed, 89 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_frame.c b/drivers/scsi/libfc/fc_frame.c
new file mode 100644
index 000000000000..63fe00cfe667
--- /dev/null
+++ b/drivers/scsi/libfc/fc_frame.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Frame allocation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/crc32.h>
+
+#include <scsi/fc_frame.h>
+
+/*
+ * Check the CRC in a frame.
+ */
+u32 fc_frame_crc_check(struct fc_frame *fp)
+{
+        u32 crc;
+        u32 error;
+        const u8 *bp;
+        unsigned int len;
+
+        WARN_ON(!fc_frame_is_linear(fp));
+        fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
+        len = (fr_len(fp) + 3) & ~3;    /* round up length to include fill */
+        bp = (const u8 *) fr_hdr(fp);
+        crc = ~crc32(~0, bp, len);
+        error = crc ^ fr_crc(fp);
+        return error;
+}
+EXPORT_SYMBOL(fc_frame_crc_check);
+
+/*
+ * Allocate a frame intended to be sent via fcoe_xmit.
+ * Get an sk_buff for the frame and set the length.
+ */
+struct fc_frame *__fc_frame_alloc(size_t len)
+{
+        struct fc_frame *fp;
+        struct sk_buff *skb;
+
+        WARN_ON((len % sizeof(u32)) != 0);
+        len += sizeof(struct fc_frame_header);
+        skb = dev_alloc_skb(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM);
+        if (!skb)
+                return NULL;
+        fp = (struct fc_frame *) skb;
+        fc_frame_init(fp);
+        skb_reserve(skb, FC_FRAME_HEADROOM);
+        skb_put(skb, len);
+        return fp;
+}
+EXPORT_SYMBOL(__fc_frame_alloc);
+
+
+struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
+{
+        struct fc_frame *fp;
+        size_t fill;
+
+        fill = payload_len % 4;
+        if (fill != 0)
+                fill = 4 - fill;
+        fp = __fc_frame_alloc(payload_len + fill);
+        if (fp) {
+                memset((char *) fr_hdr(fp) + payload_len, 0, fill);
+                /* trim is OK, we just allocated it so there are no fragments */
+                skb_trim(fp_skb(fp),
+                         payload_len + sizeof(struct fc_frame_header));
+        }
+        return fp;
+}