[deliverable/linux.git] / drivers / net / wireless / brcm80211 / brcmfmac / dhd_cdc.c

/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * 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.
 */

/*******************************************************************************
 * Communicates with the dongle by using dcmd codes.
 * For certain dcmd codes, the dongle interprets string data from the host.
 ******************************************************************************/

#include <linux/types.h>
#include <linux/netdevice.h>

#include <brcmu_utils.h>
#include <brcmu_wifi.h>

#include "dhd.h"
#include "dhd_proto.h"
#include "dhd_bus.h"
#include "dhd_dbg.h"

struct brcmf_proto_cdc_dcmd {
	__le32 cmd;	/* dongle command value */
	__le32 len;	/* lower 16: output buflen;
			 * upper 16: input buflen (excludes header) */
	__le32 flags;	/* flag defns given below */
	__le32 status;	/* status code returned from the device */
};

/* Max valid buffer size that can be sent to the dongle */
#define CDC_MAX_MSG_SIZE	(ETH_FRAME_LEN+ETH_FCS_LEN)

/* CDC flag definitions */
#define CDC_DCMD_ERROR		0x01	/* 1=cmd failed */
#define CDC_DCMD_SET		0x02	/* 0=get, 1=set cmd */
#define CDC_DCMD_IF_MASK	0xF000		/* I/F index */
#define CDC_DCMD_IF_SHIFT	12
#define CDC_DCMD_ID_MASK	0xFFFF0000	/* id an cmd pairing */
#define CDC_DCMD_ID_SHIFT	16		/* ID Mask shift bits */
#define CDC_DCMD_ID(flags)	\
	(((flags) & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT)

/*
 * BDC header - Broadcom specific extension of CDC.
 * Used on data packets to convey priority across USB.
 */
#define	BDC_HEADER_LEN		4
#define BDC_PROTO_VER		2	/* Protocol version */
#define BDC_FLAG_VER_MASK	0xf0	/* Protocol version mask */
#define BDC_FLAG_VER_SHIFT	4	/* Protocol version shift */
#define BDC_FLAG_SUM_GOOD	0x04	/* Good RX checksums */
#define BDC_FLAG_SUM_NEEDED	0x08	/* Dongle needs to do TX checksums */
#define BDC_PRIORITY_MASK	0x7
#define BDC_FLAG2_IF_MASK	0x0f	/* packet rx interface in APSTA */
#define BDC_FLAG2_IF_SHIFT	0

#define BDC_GET_IF_IDX(hdr) \
	((int)((((hdr)->flags2) & BDC_FLAG2_IF_MASK) >> BDC_FLAG2_IF_SHIFT))
#define BDC_SET_IF_IDX(hdr, idx) \
	((hdr)->flags2 = (((hdr)->flags2 & ~BDC_FLAG2_IF_MASK) | \
	((idx) << BDC_FLAG2_IF_SHIFT)))

struct brcmf_proto_bdc_header {
	u8 flags;
	u8 priority;	/* 802.1d Priority, 4:7 flow control info for usb */
	u8 flags2;
	u8 data_offset;
};


#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
#define BUS_HEADER_LEN	(16+64)		/* Must be atleast SDPCM_RESERVE
					 * (amount of header tha might be added)
					 * plus any space that might be needed
					 * for bus alignment padding.
					 */
#define ROUND_UP_MARGIN	2048	/* Biggest bus block size possible for
				 * round off at the end of buffer
				 * Currently is SDIO
				 */

struct brcmf_proto {
	u16 reqid;
	u8 bus_header[BUS_HEADER_LEN];
	struct brcmf_proto_cdc_dcmd msg;
	unsigned char buf[BRCMF_DCMD_MAXLEN + ROUND_UP_MARGIN];
};

static int brcmf_proto_cdc_msg(struct brcmf_pub *drvr)
{
	struct brcmf_proto *prot = drvr->prot;
	int len = le32_to_cpu(prot->msg.len) +
			sizeof(struct brcmf_proto_cdc_dcmd);

	brcmf_dbg(CDC, "Enter\n");

	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
	 *        returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
	 *        is actually sent to the dongle
	 */
	if (len > CDC_MAX_MSG_SIZE)
		len = CDC_MAX_MSG_SIZE;

	/* Send request */
	return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&prot->msg, len);
}

static int brcmf_proto_cdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
{
	int ret;
	struct brcmf_proto *prot = drvr->prot;

	brcmf_dbg(CDC, "Enter\n");
	len += sizeof(struct brcmf_proto_cdc_dcmd);
	do {
		ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&prot->msg,
				      len);
		if (ret < 0)
			break;
	} while (CDC_DCMD_ID(le32_to_cpu(prot->msg.flags)) != id);

	return ret;
}

int
brcmf_proto_cdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
			       void *buf, uint len)
{
	struct brcmf_proto *prot = drvr->prot;
	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	void *info;
	int ret = 0, retries = 0;
	u32 id, flags;

	brcmf_dbg(CDC, "Enter, cmd %d len %d\n", cmd, len);

	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));

	msg->cmd = cpu_to_le32(cmd);
	msg->len = cpu_to_le32(len);
	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT);
	flags = (flags & ~CDC_DCMD_IF_MASK) |
		(ifidx << CDC_DCMD_IF_SHIFT);
	msg->flags = cpu_to_le32(flags);

	if (buf)
		memcpy(prot->buf, buf, len);

	ret = brcmf_proto_cdc_msg(drvr);
	if (ret < 0) {
		brcmf_err("brcmf_proto_cdc_msg failed w/status %d\n",
			  ret);
		goto done;
	}

retry:
	/* wait for interrupt and get first fragment */
	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	if (ret < 0)
		goto done;

	flags = le32_to_cpu(msg->flags);
	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;

	if ((id < prot->reqid) && (++retries < RETRIES))
		goto retry;
	if (id != prot->reqid) {
		brcmf_err("%s: unexpected request id %d (expected %d)\n",
			  brcmf_ifname(drvr, ifidx), id, prot->reqid);
		ret = -EINVAL;
		goto done;
	}

	/* Check info buffer */
	info = (void *)&msg[1];

	/* Copy info buffer */
	if (buf) {
		if (ret < (int)len)
			len = ret;
		memcpy(buf, info, len);
	}

	/* Check the ERROR flag */
	if (flags & CDC_DCMD_ERROR)
		ret = le32_to_cpu(msg->status);

done:
	return ret;
}

int brcmf_proto_cdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
				 void *buf, uint len)
{
	struct brcmf_proto *prot = drvr->prot;
	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	int ret = 0;
	u32 flags, id;

	brcmf_dbg(CDC, "Enter, cmd %d len %d\n", cmd, len);

	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));

	msg->cmd = cpu_to_le32(cmd);
	msg->len = cpu_to_le32(len);
	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT) | CDC_DCMD_SET;
	flags = (flags & ~CDC_DCMD_IF_MASK) |
		(ifidx << CDC_DCMD_IF_SHIFT);
	msg->flags = cpu_to_le32(flags);

	if (buf)
		memcpy(prot->buf, buf, len);

	ret = brcmf_proto_cdc_msg(drvr);
	if (ret < 0)
		goto done;

	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	if (ret < 0)
		goto done;

	flags = le32_to_cpu(msg->flags);
	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;

	if (id != prot->reqid) {
		brcmf_err("%s: unexpected request id %d (expected %d)\n",
			  brcmf_ifname(drvr, ifidx), id, prot->reqid);
		ret = -EINVAL;
		goto done;
	}

	/* Check the ERROR flag */
	if (flags & CDC_DCMD_ERROR)
		ret = le32_to_cpu(msg->status);

done:
	return ret;
}

static bool pkt_sum_needed(struct sk_buff *skb)
{
	return skb->ip_summed == CHECKSUM_PARTIAL;
}

static void pkt_set_sum_good(struct sk_buff *skb, bool x)
{
	skb->ip_summed = (x ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
}

void brcmf_proto_hdrpush(struct brcmf_pub *drvr, int ifidx,
			 struct sk_buff *pktbuf)
{
	struct brcmf_proto_bdc_header *h;

	brcmf_dbg(CDC, "Enter\n");

	/* Push BDC header used to convey priority for buses that don't */

	skb_push(pktbuf, BDC_HEADER_LEN);

	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);

	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
	if (pkt_sum_needed(pktbuf))
		h->flags |= BDC_FLAG_SUM_NEEDED;

	h->priority = (pktbuf->priority & BDC_PRIORITY_MASK);
	h->flags2 = 0;
	h->data_offset = 0;
	BDC_SET_IF_IDX(h, ifidx);
}

int brcmf_proto_hdrpull(struct brcmf_pub *drvr, u8 *ifidx,
			struct sk_buff *pktbuf)
{
	struct brcmf_proto_bdc_header *h;

	brcmf_dbg(CDC, "Enter\n");

	/* Pop BDC header used to convey priority for buses that don't */

	if (pktbuf->len < BDC_HEADER_LEN) {
		brcmf_err("rx data too short (%d < %d)\n",
			  pktbuf->len, BDC_HEADER_LEN);
		return -EBADE;
	}

	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);

	*ifidx = BDC_GET_IF_IDX(h);
	if (*ifidx >= BRCMF_MAX_IFS) {
		brcmf_err("rx data ifnum out of range (%d)\n", *ifidx);
		return -EBADE;
	}
	/* The ifidx is the idx to map to matching netdev/ifp. When receiving
	 * events this is easy because it contains the bssidx which maps
	 * 1-on-1 to the netdev/ifp. But for data frames the ifidx is rcvd.
	 * bssidx 1 is used for p2p0 and no data can be received or
	 * transmitted on it. Therefor bssidx is ifidx + 1 if ifidx > 0
	 */
	if (*ifidx)
		(*ifidx)++;

	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
	    BDC_PROTO_VER) {
		brcmf_err("%s: non-BDC packet received, flags 0x%x\n",
			  brcmf_ifname(drvr, *ifidx), h->flags);
		return -EBADE;
	}

	if (h->flags & BDC_FLAG_SUM_GOOD) {
		brcmf_dbg(CDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
			  brcmf_ifname(drvr, *ifidx), h->flags);
		pkt_set_sum_good(pktbuf, true);
	}

	pktbuf->priority = h->priority & BDC_PRIORITY_MASK;

	skb_pull(pktbuf, BDC_HEADER_LEN);
	skb_pull(pktbuf, h->data_offset << 2);

	if (pktbuf->len == 0)
		return -ENODATA;
	return 0;
}

int brcmf_proto_attach(struct brcmf_pub *drvr)
{
	struct brcmf_proto *cdc;

	cdc = kzalloc(sizeof(struct brcmf_proto), GFP_ATOMIC);
	if (!cdc)
		goto fail;

	/* ensure that the msg buf directly follows the cdc msg struct */
	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
		brcmf_err("struct brcmf_proto is not correctly defined\n");
		goto fail;
	}

	drvr->prot = cdc;
	drvr->hdrlen += BDC_HEADER_LEN;
	drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
			sizeof(struct brcmf_proto_cdc_dcmd) + ROUND_UP_MARGIN;
	return 0;

fail:
	kfree(cdc);
	return -ENOMEM;
}

/* ~NOTE~ What if another thread is waiting on the semaphore?  Holding it? */
void brcmf_proto_detach(struct brcmf_pub *drvr)
{
	kfree(drvr->prot);
	drvr->prot = NULL;
}

void brcmf_proto_stop(struct brcmf_pub *drvr)
{
	/* Nothing to do for CDC */
}
Commit	Line	Data
5b435de0 AS	1	/*
	2	* Copyright (c) 2010 Broadcom Corporation
	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
	11	* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
	13	* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
	14	* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	/*******************************************************************************
	18	* Communicates with the dongle by using dcmd codes.
	19	* For certain dcmd codes, the dongle interprets string data from the host.
	20	******************************************************************************/
	21
	22	#include <linux/types.h>
	23	#include <linux/netdevice.h>
5b435de0 AS	24
	25	#include <brcmu_utils.h>
	26	#include <brcmu_wifi.h>
	27
	28	#include "dhd.h"
	29	#include "dhd_proto.h"
	30	#include "dhd_bus.h"
	31	#include "dhd_dbg.h"
	32
	33	struct brcmf_proto_cdc_dcmd {
	34	__le32 cmd; /* dongle command value */
	35	__le32 len; /* lower 16: output buflen;
	36	* upper 16: input buflen (excludes header) */
	37	__le32 flags; /* flag defns given below */
	38	__le32 status; /* status code returned from the device */
	39	};
	40
	41	/* Max valid buffer size that can be sent to the dongle */
	42	#define CDC_MAX_MSG_SIZE (ETH_FRAME_LEN+ETH_FCS_LEN)
	43
	44	/* CDC flag definitions */
	45	#define CDC_DCMD_ERROR 0x01 /* 1=cmd failed */
	46	#define CDC_DCMD_SET 0x02 /* 0=get, 1=set cmd */
	47	#define CDC_DCMD_IF_MASK 0xF000 /* I/F index */
	48	#define CDC_DCMD_IF_SHIFT 12
	49	#define CDC_DCMD_ID_MASK 0xFFFF0000 /* id an cmd pairing */
	50	#define CDC_DCMD_ID_SHIFT 16 /* ID Mask shift bits */
	51	#define CDC_DCMD_ID(flags) \
	52	(((flags) & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT)
	53
	54	/*
	55	* BDC header - Broadcom specific extension of CDC.
	56	* Used on data packets to convey priority across USB.
	57	*/
	58	#define BDC_HEADER_LEN 4
e40aed06	59	#define BDC_PROTO_VER 2 /* Protocol version */
5b435de0 AS	60	#define BDC_FLAG_VER_MASK 0xf0 /* Protocol version mask */
	61	#define BDC_FLAG_VER_SHIFT 4 /* Protocol version shift */
	62	#define BDC_FLAG_SUM_GOOD 0x04 /* Good RX checksums */
	63	#define BDC_FLAG_SUM_NEEDED 0x08 /* Dongle needs to do TX checksums */
	64	#define BDC_PRIORITY_MASK 0x7
	65	#define BDC_FLAG2_IF_MASK 0x0f /* packet rx interface in APSTA */
	66	#define BDC_FLAG2_IF_SHIFT 0
	67
	68	#define BDC_GET_IF_IDX(hdr) \
	69	((int)((((hdr)->flags2) & BDC_FLAG2_IF_MASK) >> BDC_FLAG2_IF_SHIFT))
	70	#define BDC_SET_IF_IDX(hdr, idx) \
	71	((hdr)->flags2 = (((hdr)->flags2 & ~BDC_FLAG2_IF_MASK) \| \
	72	((idx) << BDC_FLAG2_IF_SHIFT)))
	73
	74	struct brcmf_proto_bdc_header {
	75	u8 flags;
	76	u8 priority; /* 802.1d Priority, 4:7 flow control info for usb */
	77	u8 flags2;
e40aed06	78	u8 data_offset;
5b435de0 AS	79	};
	80
	81
	82	#define RETRIES 2 /* # of retries to retrieve matching dcmd response */
6e3c7128	83	#define BUS_HEADER_LEN (16+64) /* Must be atleast SDPCM_RESERVE
5b435de0 AS	84	* (amount of header tha might be added)
5b435de0 AS	85	* plus any space that might be needed
6e3c7128	86	* for bus alignment padding.
5b435de0	87	*/
6e3c7128	88	#define ROUND_UP_MARGIN 2048 /* Biggest bus block size possible for
5b435de0	89	* round off at the end of buffer
6e3c7128	90	* Currently is SDIO
5b435de0 AS	91	*/
	92
	93	struct brcmf_proto {
	94	u16 reqid;
5b435de0 AS	95	u8 bus_header[BUS_HEADER_LEN];
	96	struct brcmf_proto_cdc_dcmd msg;
	97	unsigned char buf[BRCMF_DCMD_MAXLEN + ROUND_UP_MARGIN];
	98	};
	99
	100	static int brcmf_proto_cdc_msg(struct brcmf_pub *drvr)
	101	{
	102	struct brcmf_proto *prot = drvr->prot;
	103	int len = le32_to_cpu(prot->msg.len) +
	104	sizeof(struct brcmf_proto_cdc_dcmd);
	105
a6cfb147	106	brcmf_dbg(CDC, "Enter\n");
5b435de0 AS	107
	108	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
	109	* returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
	110	* is actually sent to the dongle
	111	*/
	112	if (len > CDC_MAX_MSG_SIZE)
	113	len = CDC_MAX_MSG_SIZE;
	114
	115	/* Send request */
d9cb2596	116	return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&prot->msg, len);
5b435de0 AS	117	}
	118
	119	static int brcmf_proto_cdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
	120	{
	121	int ret;
	122	struct brcmf_proto *prot = drvr->prot;
	123
a6cfb147	124	brcmf_dbg(CDC, "Enter\n");
d9cb2596	125	len += sizeof(struct brcmf_proto_cdc_dcmd);
5b435de0	126	do {
d9cb2596 AS	127	ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&prot->msg,
d9cb2596 AS	128	len);
5b435de0 AS	129	if (ret < 0)
	130	break;
	131	} while (CDC_DCMD_ID(le32_to_cpu(prot->msg.flags)) != id);
	132
	133	return ret;
	134	}
	135
	136	int
	137	brcmf_proto_cdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
	138	void *buf, uint len)
	139	{
	140	struct brcmf_proto *prot = drvr->prot;
	141	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	142	void *info;
	143	int ret = 0, retries = 0;
	144	u32 id, flags;
	145
a6cfb147	146	brcmf_dbg(CDC, "Enter, cmd %d len %d\n", cmd, len);
5b435de0	147
5b435de0 AS	148	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
	149
	150	msg->cmd = cpu_to_le32(cmd);
	151	msg->len = cpu_to_le32(len);
	152	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT);
	153	flags = (flags & ~CDC_DCMD_IF_MASK) \|
	154	(ifidx << CDC_DCMD_IF_SHIFT);
	155	msg->flags = cpu_to_le32(flags);
	156
	157	if (buf)
	158	memcpy(prot->buf, buf, len);
	159
	160	ret = brcmf_proto_cdc_msg(drvr);
	161	if (ret < 0) {
5e8149f5	162	brcmf_err("brcmf_proto_cdc_msg failed w/status %d\n",
5b435de0 AS	163	ret);
	164	goto done;
	165	}
	166
	167	retry:
	168	/* wait for interrupt and get first fragment */
	169	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	170	if (ret < 0)
	171	goto done;
	172
	173	flags = le32_to_cpu(msg->flags);
	174	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
	175
	176	if ((id < prot->reqid) && (++retries < RETRIES))
	177	goto retry;
	178	if (id != prot->reqid) {
5e8149f5	179	brcmf_err("%s: unexpected request id %d (expected %d)\n",
5b435de0 AS	180	brcmf_ifname(drvr, ifidx), id, prot->reqid);
	181	ret = -EINVAL;
	182	goto done;
	183	}
	184
	185	/* Check info buffer */
	186	info = (void *)&msg[1];
	187
	188	/* Copy info buffer */
	189	if (buf) {
	190	if (ret < (int)len)
	191	len = ret;
	192	memcpy(buf, info, len);
	193	}
	194
	195	/* Check the ERROR flag */
03abad08	196	if (flags & CDC_DCMD_ERROR)
5b435de0	197	ret = le32_to_cpu(msg->status);
5b435de0 AS	198
	199	done:
	200	return ret;
	201	}
	202
	203	int brcmf_proto_cdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
	204	void *buf, uint len)
	205	{
	206	struct brcmf_proto *prot = drvr->prot;
	207	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	208	int ret = 0;
	209	u32 flags, id;
	210
a6cfb147	211	brcmf_dbg(CDC, "Enter, cmd %d len %d\n", cmd, len);
5b435de0 AS	212
	213	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
	214
	215	msg->cmd = cpu_to_le32(cmd);
	216	msg->len = cpu_to_le32(len);
	217	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT) \| CDC_DCMD_SET;
	218	flags = (flags & ~CDC_DCMD_IF_MASK) \|
	219	(ifidx << CDC_DCMD_IF_SHIFT);
	220	msg->flags = cpu_to_le32(flags);
	221
	222	if (buf)
	223	memcpy(prot->buf, buf, len);
	224
	225	ret = brcmf_proto_cdc_msg(drvr);
	226	if (ret < 0)
	227	goto done;
	228
	229	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	230	if (ret < 0)
	231	goto done;
	232
	233	flags = le32_to_cpu(msg->flags);
	234	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
	235
	236	if (id != prot->reqid) {
5e8149f5	237	brcmf_err("%s: unexpected request id %d (expected %d)\n",
5b435de0 AS	238	brcmf_ifname(drvr, ifidx), id, prot->reqid);
	239	ret = -EINVAL;
	240	goto done;
	241	}
	242
	243	/* Check the ERROR flag */
03abad08	244	if (flags & CDC_DCMD_ERROR)
5b435de0	245	ret = le32_to_cpu(msg->status);
5b435de0 AS	246
	247	done:
	248	return ret;
	249	}
	250
5b435de0 AS	251	static bool pkt_sum_needed(struct sk_buff *skb)
	252	{
	253	return skb->ip_summed == CHECKSUM_PARTIAL;
	254	}
	255
	256	static void pkt_set_sum_good(struct sk_buff *skb, bool x)
	257	{
	258	skb->ip_summed = (x ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
	259	}
	260
	261	void brcmf_proto_hdrpush(struct brcmf_pub *drvr, int ifidx,
	262	struct sk_buff *pktbuf)
	263	{
	264	struct brcmf_proto_bdc_header *h;
	265
a6cfb147	266	brcmf_dbg(CDC, "Enter\n");
5b435de0 AS	267
	268	/* Push BDC header used to convey priority for buses that don't */
	269
	270	skb_push(pktbuf, BDC_HEADER_LEN);
	271
	272	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
	273
	274	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
	275	if (pkt_sum_needed(pktbuf))
	276	h->flags \|= BDC_FLAG_SUM_NEEDED;
	277
	278	h->priority = (pktbuf->priority & BDC_PRIORITY_MASK);
	279	h->flags2 = 0;
e40aed06	280	h->data_offset = 0;
5b435de0 AS	281	BDC_SET_IF_IDX(h, ifidx);
	282	}
	283
a43af515	284	int brcmf_proto_hdrpull(struct brcmf_pub drvr, u8 ifidx,
5b435de0 AS	285	struct sk_buff *pktbuf)
	286	{
	287	struct brcmf_proto_bdc_header *h;
	288
a6cfb147	289	brcmf_dbg(CDC, "Enter\n");
5b435de0 AS	290
	291	/* Pop BDC header used to convey priority for buses that don't */
	292
	293	if (pktbuf->len < BDC_HEADER_LEN) {
5e8149f5	294	brcmf_err("rx data too short (%d < %d)\n",
5b435de0 AS	295	pktbuf->len, BDC_HEADER_LEN);
	296	return -EBADE;
	297	}
	298
	299	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
	300
	301	*ifidx = BDC_GET_IF_IDX(h);
	302	if (*ifidx >= BRCMF_MAX_IFS) {
5e8149f5	303	brcmf_err("rx data ifnum out of range (%d)\n", *ifidx);
5b435de0 AS	304	return -EBADE;
5b435de0 AS	305	}
2880b868 HM	306	/* The ifidx is the idx to map to matching netdev/ifp. When receiving
	307	* events this is easy because it contains the bssidx which maps
	308	* 1-on-1 to the netdev/ifp. But for data frames the ifidx is rcvd.
	309	* bssidx 1 is used for p2p0 and no data can be received or
	310	* transmitted on it. Therefor bssidx is ifidx + 1 if ifidx > 0
	311	*/
	312	if (*ifidx)
	313	(*ifidx)++;
5b435de0 AS	314
	315	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
	316	BDC_PROTO_VER) {
5e8149f5	317	brcmf_err("%s: non-BDC packet received, flags 0x%x\n",
5b435de0 AS	318	brcmf_ifname(drvr, *ifidx), h->flags);
	319	return -EBADE;
	320	}
	321
	322	if (h->flags & BDC_FLAG_SUM_GOOD) {
a6cfb147	323	brcmf_dbg(CDC, "%s: BDC rcv, good checksum, flags 0x%x\n",
5b435de0 AS	324	brcmf_ifname(drvr, *ifidx), h->flags);
	325	pkt_set_sum_good(pktbuf, true);
	326	}
	327
	328	pktbuf->priority = h->priority & BDC_PRIORITY_MASK;
	329
	330	skb_pull(pktbuf, BDC_HEADER_LEN);
8f1ab44d	331	skb_pull(pktbuf, h->data_offset << 2);
5b435de0	332
a43af515 AS	333	if (pktbuf->len == 0)
a43af515 AS	334	return -ENODATA;
5b435de0 AS	335	return 0;
	336	}
	337
	338	int brcmf_proto_attach(struct brcmf_pub *drvr)
	339	{
	340	struct brcmf_proto *cdc;
	341
	342	cdc = kzalloc(sizeof(struct brcmf_proto), GFP_ATOMIC);
	343	if (!cdc)
	344	goto fail;
	345
	346	/* ensure that the msg buf directly follows the cdc msg struct */
	347	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
5e8149f5	348	brcmf_err("struct brcmf_proto is not correctly defined\n");
5b435de0 AS	349	goto fail;
	350	}
	351
	352	drvr->prot = cdc;
	353	drvr->hdrlen += BDC_HEADER_LEN;
b01a6b3c	354	drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
5b435de0 AS	355	sizeof(struct brcmf_proto_cdc_dcmd) + ROUND_UP_MARGIN;
	356	return 0;
	357
	358	fail:
	359	kfree(cdc);
	360	return -ENOMEM;
	361	}
	362
	363	/* ~NOTE~ What if another thread is waiting on the semaphore? Holding it? */
	364	void brcmf_proto_detach(struct brcmf_pub *drvr)
	365	{
	366	kfree(drvr->prot);
	367	drvr->prot = NULL;
	368	}
	369
5b435de0 AS	370	void brcmf_proto_stop(struct brcmf_pub *drvr)
	371	{
	372	/* Nothing to do for CDC */
	373	}