mwifiex: add custom IE framework

1. support for setting custom IE from application hostapd etc.
Custom IE addition using auto-indexing and Custom IE deletion using
static indices (which are allocated during IE addition and stored in
driver) are supported.
2. Separate file for handling IE related execution.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 149 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/ie.c b/drivers/net/wireless/mwifiex/ie.c
new file mode 100644
index 000000000000..772bf3e57006
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/ie.c
@@ -0,0 +1,149 @@
+/*
+ * Marvell Wireless LAN device driver: management IE handling- setting and
+ * deleting IE.
+ *
+ * Copyright (C) 2012, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available by writing to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
+ * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include "main.h"
+
+/* This function checks if current IE index is used by any on other interface.
+ * Return: -1: yes, current IE index is used by someone else.
+ *          0: no, current IE index is NOT used by other interface.
+ */
+static int
+mwifiex_ie_index_used_by_other_intf(struct mwifiex_private *priv, u16 idx)
+{
+	int i;
+	struct mwifiex_adapter *adapter = priv->adapter;
+	struct mwifiex_ie *ie;
+
+	for (i = 0; i < adapter->priv_num; i++) {
+		if (adapter->priv[i] != priv) {
+			ie = &adapter->priv[i]->mgmt_ie[idx];
+			if (ie->mgmt_subtype_mask && ie->ie_length)
+				return -1;
+		}
+	}
+
+	return 0;
+}
+
+/* Get unused IE index. This index will be used for setting new IE */
+static int
+mwifiex_ie_get_autoidx(struct mwifiex_private *priv, u16 subtype_mask,
+		       struct mwifiex_ie *ie, u16 *index)
+{
+	u16 mask, len, i;
+
+	for (i = 0; i < priv->adapter->max_mgmt_ie_index; i++) {
+		mask = le16_to_cpu(priv->mgmt_ie[i].mgmt_subtype_mask);
+		len = le16_to_cpu(priv->mgmt_ie[i].ie_length) +
+		      le16_to_cpu(ie->ie_length);
+
+		if (mask == MWIFIEX_AUTO_IDX_MASK)
+			continue;
+
+		if (mask == subtype_mask) {
+			if (len > IEEE_MAX_IE_SIZE)
+				continue;
+
+			*index = i;
+			return 0;
+		}
+
+		if (!priv->mgmt_ie[i].ie_length) {
+			if (mwifiex_ie_index_used_by_other_intf(priv, i))
+				continue;
+
+			*index = i;
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+/* This function prepares IE data buffer for command to be sent to FW */
+static int
+mwifiex_update_autoindex_ies(struct mwifiex_private *priv,
+			     struct mwifiex_ie_list *ie_list)
+{
+	u16 travel_len, index, mask;
+	s16 input_len;
+	struct mwifiex_ie *ie;
+	u8 *tmp;
+
+	input_len = le16_to_cpu(ie_list->len);
+	travel_len = sizeof(struct host_cmd_tlv);
+
+	ie_list->len = 0;
+
+	while (input_len > 0) {
+		ie = (struct mwifiex_ie *)(((u8 *)ie_list) + travel_len);
+		input_len -= le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;
+		travel_len += le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;
+
+		index = le16_to_cpu(ie->ie_index);
+		mask = le16_to_cpu(ie->mgmt_subtype_mask);
+
+		if (index == MWIFIEX_AUTO_IDX_MASK) {
+			/* automatic addition */
+			if (mwifiex_ie_get_autoidx(priv, mask, ie, &index))
+				return -1;
+			if (index == MWIFIEX_AUTO_IDX_MASK)
+				return -1;
+
+			tmp = (u8 *)&priv->mgmt_ie[index].ie_buffer;
+			tmp += le16_to_cpu(priv->mgmt_ie[index].ie_length);
+			memcpy(tmp, &ie->ie_buffer, le16_to_cpu(ie->ie_length));
+			le16_add_cpu(&priv->mgmt_ie[index].ie_length,
+				     le16_to_cpu(ie->ie_length));
+			priv->mgmt_ie[index].ie_index = cpu_to_le16(index);
+			priv->mgmt_ie[index].mgmt_subtype_mask =
+							cpu_to_le16(mask);
+
+			ie->ie_index = cpu_to_le16(index);
+			ie->ie_length = priv->mgmt_ie[index].ie_length;
+			memcpy(&ie->ie_buffer, &priv->mgmt_ie[index].ie_buffer,
+			       le16_to_cpu(priv->mgmt_ie[index].ie_length));
+		} else {
+			if (mask != MWIFIEX_DELETE_MASK)
+				return -1;
+			/*
+			 * Check if this index is being used on any
+			 * other interface.
+			 */
+			if (mwifiex_ie_index_used_by_other_intf(priv, index))
+				return -1;
+
+			ie->ie_length = 0;
+			memcpy(&priv->mgmt_ie[index], ie,
+			       sizeof(struct mwifiex_ie));
+		}
+
+		le16_add_cpu(&ie_list->len,
+			     le16_to_cpu(priv->mgmt_ie[index].ie_length) +
+			     MWIFIEX_IE_HDR_SIZE);
+	}
+
+	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP)
+		return mwifiex_send_cmd_async(priv, HostCmd_CMD_UAP_SYS_CONFIG,
+					      HostCmd_ACT_GEN_SET,
+					      UAP_CUSTOM_IE_I, ie_list);
+
+	return 0;
+}