[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 pending;
	u32 lastcmd;
	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(TRACE, "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(TRACE, "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(TRACE, "Enter\n");
	brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);

	/* Respond "bcmerror" and "bcmerrorstr" with local cache */
	if (cmd == BRCMF_C_GET_VAR && buf) {
		if (!strcmp((char *)buf, "bcmerrorstr")) {
			strncpy((char *)buf, "bcm_error",
				BCME_STRLEN);
			goto done;
		} else if (!strcmp((char *)buf, "bcmerror")) {
			*(int *)buf = drvr->dongle_error;
			goto done;
		}
	}

	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);
		/* Cache error from dongle */
		drvr->dongle_error = ret;
	}

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(TRACE, "Enter\n");
	brcmf_dbg(CTL, "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);
		/* Cache error from dongle */
		drvr->dongle_error = ret;
	}

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(TRACE, "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 device *dev, int *ifidx,
			struct sk_buff *pktbuf)
{
	struct brcmf_proto_bdc_header *h;
	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
	struct brcmf_pub *drvr = bus_if->drvr;

	brcmf_dbg(TRACE, "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;
	}

	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(INFO, "%s: BDC packet received with good rx-csum, 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);

	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;
	95	u8 pending;
	96	u32 lastcmd;
	97	u8 bus_header[BUS_HEADER_LEN];
	98	struct brcmf_proto_cdc_dcmd msg;
	99	unsigned char buf[BRCMF_DCMD_MAXLEN + ROUND_UP_MARGIN];
	100	};
	101
	102	static int brcmf_proto_cdc_msg(struct brcmf_pub *drvr)
	103	{
	104	struct brcmf_proto *prot = drvr->prot;
	105	int len = le32_to_cpu(prot->msg.len) +
	106	sizeof(struct brcmf_proto_cdc_dcmd);
	107
	108	brcmf_dbg(TRACE, "Enter\n");
	109
	110	/* NOTE : cdc->msg.len holds the desired length of the buffer to be
	111	* returned. Only up to CDC_MAX_MSG_SIZE of this buffer area
	112	* is actually sent to the dongle
	113	*/
	114	if (len > CDC_MAX_MSG_SIZE)
	115	len = CDC_MAX_MSG_SIZE;
	116
	117	/* Send request */
d9cb2596	118	return brcmf_bus_txctl(drvr->bus_if, (unsigned char *)&prot->msg, len);
5b435de0 AS	119	}
	120
	121	static int brcmf_proto_cdc_cmplt(struct brcmf_pub *drvr, u32 id, u32 len)
	122	{
	123	int ret;
	124	struct brcmf_proto *prot = drvr->prot;
	125
	126	brcmf_dbg(TRACE, "Enter\n");
d9cb2596	127	len += sizeof(struct brcmf_proto_cdc_dcmd);
5b435de0	128	do {
d9cb2596 AS	129	ret = brcmf_bus_rxctl(drvr->bus_if, (unsigned char *)&prot->msg,
d9cb2596 AS	130	len);
5b435de0 AS	131	if (ret < 0)
	132	break;
	133	} while (CDC_DCMD_ID(le32_to_cpu(prot->msg.flags)) != id);
	134
	135	return ret;
	136	}
	137
	138	int
	139	brcmf_proto_cdc_query_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
	140	void *buf, uint len)
	141	{
	142	struct brcmf_proto *prot = drvr->prot;
	143	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	144	void *info;
	145	int ret = 0, retries = 0;
	146	u32 id, flags;
	147
	148	brcmf_dbg(TRACE, "Enter\n");
	149	brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
	150
	151	/* Respond "bcmerror" and "bcmerrorstr" with local cache */
	152	if (cmd == BRCMF_C_GET_VAR && buf) {
	153	if (!strcmp((char *)buf, "bcmerrorstr")) {
	154	strncpy((char *)buf, "bcm_error",
	155	BCME_STRLEN);
	156	goto done;
	157	} else if (!strcmp((char *)buf, "bcmerror")) {
	158	(int )buf = drvr->dongle_error;
	159	goto done;
	160	}
	161	}
	162
	163	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
	164
	165	msg->cmd = cpu_to_le32(cmd);
	166	msg->len = cpu_to_le32(len);
	167	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT);
	168	flags = (flags & ~CDC_DCMD_IF_MASK) \|
	169	(ifidx << CDC_DCMD_IF_SHIFT);
	170	msg->flags = cpu_to_le32(flags);
	171
	172	if (buf)
	173	memcpy(prot->buf, buf, len);
	174
	175	ret = brcmf_proto_cdc_msg(drvr);
	176	if (ret < 0) {
5e8149f5	177	brcmf_err("brcmf_proto_cdc_msg failed w/status %d\n",
5b435de0 AS	178	ret);
	179	goto done;
	180	}
	181
	182	retry:
	183	/* wait for interrupt and get first fragment */
	184	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	185	if (ret < 0)
	186	goto done;
	187
	188	flags = le32_to_cpu(msg->flags);
	189	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
	190
	191	if ((id < prot->reqid) && (++retries < RETRIES))
	192	goto retry;
	193	if (id != prot->reqid) {
5e8149f5	194	brcmf_err("%s: unexpected request id %d (expected %d)\n",
5b435de0 AS	195	brcmf_ifname(drvr, ifidx), id, prot->reqid);
	196	ret = -EINVAL;
	197	goto done;
	198	}
	199
	200	/* Check info buffer */
	201	info = (void *)&msg[1];
	202
	203	/* Copy info buffer */
	204	if (buf) {
	205	if (ret < (int)len)
	206	len = ret;
	207	memcpy(buf, info, len);
	208	}
	209
	210	/* Check the ERROR flag */
	211	if (flags & CDC_DCMD_ERROR) {
	212	ret = le32_to_cpu(msg->status);
	213	/* Cache error from dongle */
	214	drvr->dongle_error = ret;
	215	}
	216
	217	done:
	218	return ret;
	219	}
	220
	221	int brcmf_proto_cdc_set_dcmd(struct brcmf_pub *drvr, int ifidx, uint cmd,
	222	void *buf, uint len)
	223	{
	224	struct brcmf_proto *prot = drvr->prot;
	225	struct brcmf_proto_cdc_dcmd *msg = &prot->msg;
	226	int ret = 0;
	227	u32 flags, id;
	228
	229	brcmf_dbg(TRACE, "Enter\n");
	230	brcmf_dbg(CTL, "cmd %d len %d\n", cmd, len);
	231
	232	memset(msg, 0, sizeof(struct brcmf_proto_cdc_dcmd));
	233
	234	msg->cmd = cpu_to_le32(cmd);
	235	msg->len = cpu_to_le32(len);
	236	flags = (++prot->reqid << CDC_DCMD_ID_SHIFT) \| CDC_DCMD_SET;
	237	flags = (flags & ~CDC_DCMD_IF_MASK) \|
	238	(ifidx << CDC_DCMD_IF_SHIFT);
	239	msg->flags = cpu_to_le32(flags);
	240
	241	if (buf)
	242	memcpy(prot->buf, buf, len);
	243
	244	ret = brcmf_proto_cdc_msg(drvr);
	245	if (ret < 0)
	246	goto done;
	247
	248	ret = brcmf_proto_cdc_cmplt(drvr, prot->reqid, len);
	249	if (ret < 0)
	250	goto done;
	251
	252	flags = le32_to_cpu(msg->flags);
	253	id = (flags & CDC_DCMD_ID_MASK) >> CDC_DCMD_ID_SHIFT;
	254
	255	if (id != prot->reqid) {
5e8149f5	256	brcmf_err("%s: unexpected request id %d (expected %d)\n",
5b435de0 AS	257	brcmf_ifname(drvr, ifidx), id, prot->reqid);
	258	ret = -EINVAL;
	259	goto done;
	260	}
	261
	262	/* Check the ERROR flag */
	263	if (flags & CDC_DCMD_ERROR) {
	264	ret = le32_to_cpu(msg->status);
	265	/* Cache error from dongle */
	266	drvr->dongle_error = ret;
	267	}
	268
	269	done:
	270	return ret;
	271	}
	272
5b435de0 AS	273	static bool pkt_sum_needed(struct sk_buff *skb)
	274	{
	275	return skb->ip_summed == CHECKSUM_PARTIAL;
	276	}
	277
	278	static void pkt_set_sum_good(struct sk_buff *skb, bool x)
	279	{
	280	skb->ip_summed = (x ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
	281	}
	282
	283	void brcmf_proto_hdrpush(struct brcmf_pub *drvr, int ifidx,
	284	struct sk_buff *pktbuf)
	285	{
	286	struct brcmf_proto_bdc_header *h;
	287
	288	brcmf_dbg(TRACE, "Enter\n");
	289
	290	/* Push BDC header used to convey priority for buses that don't */
	291
	292	skb_push(pktbuf, BDC_HEADER_LEN);
	293
	294	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
	295
	296	h->flags = (BDC_PROTO_VER << BDC_FLAG_VER_SHIFT);
	297	if (pkt_sum_needed(pktbuf))
	298	h->flags \|= BDC_FLAG_SUM_NEEDED;
	299
	300	h->priority = (pktbuf->priority & BDC_PRIORITY_MASK);
	301	h->flags2 = 0;
e40aed06	302	h->data_offset = 0;
5b435de0 AS	303	BDC_SET_IF_IDX(h, ifidx);
	304	}
	305
d5625ee6	306	int brcmf_proto_hdrpull(struct device dev, int ifidx,
5b435de0 AS	307	struct sk_buff *pktbuf)
	308	{
	309	struct brcmf_proto_bdc_header *h;
d5625ee6 FL	310	struct brcmf_bus *bus_if = dev_get_drvdata(dev);
d5625ee6 FL	311	struct brcmf_pub *drvr = bus_if->drvr;
5b435de0 AS	312
	313	brcmf_dbg(TRACE, "Enter\n");
	314
	315	/* Pop BDC header used to convey priority for buses that don't */
	316
	317	if (pktbuf->len < BDC_HEADER_LEN) {
5e8149f5	318	brcmf_err("rx data too short (%d < %d)\n",
5b435de0 AS	319	pktbuf->len, BDC_HEADER_LEN);
	320	return -EBADE;
	321	}
	322
	323	h = (struct brcmf_proto_bdc_header *)(pktbuf->data);
	324
	325	*ifidx = BDC_GET_IF_IDX(h);
	326	if (*ifidx >= BRCMF_MAX_IFS) {
5e8149f5	327	brcmf_err("rx data ifnum out of range (%d)\n", *ifidx);
5b435de0 AS	328	return -EBADE;
	329	}
	330
	331	if (((h->flags & BDC_FLAG_VER_MASK) >> BDC_FLAG_VER_SHIFT) !=
	332	BDC_PROTO_VER) {
5e8149f5	333	brcmf_err("%s: non-BDC packet received, flags 0x%x\n",
5b435de0 AS	334	brcmf_ifname(drvr, *ifidx), h->flags);
	335	return -EBADE;
	336	}
	337
	338	if (h->flags & BDC_FLAG_SUM_GOOD) {
	339	brcmf_dbg(INFO, "%s: BDC packet received with good rx-csum, flags 0x%x\n",
	340	brcmf_ifname(drvr, *ifidx), h->flags);
	341	pkt_set_sum_good(pktbuf, true);
	342	}
	343
	344	pktbuf->priority = h->priority & BDC_PRIORITY_MASK;
	345
	346	skb_pull(pktbuf, BDC_HEADER_LEN);
8f1ab44d	347	skb_pull(pktbuf, h->data_offset << 2);
5b435de0 AS	348
	349	return 0;
	350	}
	351
	352	int brcmf_proto_attach(struct brcmf_pub *drvr)
	353	{
	354	struct brcmf_proto *cdc;
	355
	356	cdc = kzalloc(sizeof(struct brcmf_proto), GFP_ATOMIC);
	357	if (!cdc)
	358	goto fail;
	359
	360	/* ensure that the msg buf directly follows the cdc msg struct */
	361	if ((unsigned long)(&cdc->msg + 1) != (unsigned long)cdc->buf) {
5e8149f5	362	brcmf_err("struct brcmf_proto is not correctly defined\n");
5b435de0 AS	363	goto fail;
	364	}
	365
	366	drvr->prot = cdc;
	367	drvr->hdrlen += BDC_HEADER_LEN;
b01a6b3c	368	drvr->bus_if->maxctl = BRCMF_DCMD_MAXLEN +
5b435de0 AS	369	sizeof(struct brcmf_proto_cdc_dcmd) + ROUND_UP_MARGIN;
	370	return 0;
	371
	372	fail:
	373	kfree(cdc);
	374	return -ENOMEM;
	375	}
	376
	377	/* ~NOTE~ What if another thread is waiting on the semaphore? Holding it? */
	378	void brcmf_proto_detach(struct brcmf_pub *drvr)
	379	{
	380	kfree(drvr->prot);
	381	drvr->prot = NULL;
	382	}
	383
5b435de0 AS	384	void brcmf_proto_stop(struct brcmf_pub *drvr)
	385	{
	386	/* Nothing to do for CDC */
	387	}