Commit c8806b6c authored by Narsimhulu Musini's avatar Narsimhulu Musini Committed by James Bottomley
Browse files

snic: driver for Cisco SCSI HBA 



Cisco has developed a new PCI HBA interface called sNIC, which stands for
SCSI NIC. This is a new storage feature supported on specialized network
adapter. The new PCI function provides a uniform host interface and abstracts
backend storage.

[jejb: fix up checkpatch errors]
Signed-off-by: default avatarNarsimhulu Musini <nmusini@cisco.com>
Signed-off-by: default avatarSesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarJames Bottomley <JBottomley@Odin.com>
parent 8d2b21db

MAINTAINERS

+7 −0
Original line number Diff line number Diff line
@@ -2590,6 +2590,13 @@ L: linux-scsi@vger.kernel.org 
S:	Supported

F:	drivers/scsi/fnic/



CISCO SCSI HBA DRIVER

M:	Narsimhulu Musini <nmusini@cisco.com>

M:	Sesidhar Baddela <sebaddel@cisco.com>

L:	linux-scsi@vger.kernel.org

S:	Supported

F:	drivers/scsi/snic/



CMPC ACPI DRIVER

M:	Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>

M:	Daniel Oliveira Nascimento <don@syst.com.br>

drivers/scsi/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -634,6 +634,23 @@ config FCOE_FNIC 
	  <file:Documentation/scsi/scsi.txt>.

	  The module will be called fnic.



config SCSI_SNIC

	tristate "Cisco SNIC Driver"

	depends on PCI && SCSI

	help

	  This is support for the Cisco PCI-Express SCSI HBA.



	  To compile this driver as a module, choose M here and read

	  <file:Documentation/scsi/scsi.txt>.

	  The module will be called snic.



config SCSI_SNIC_DEBUG_FS

	bool "Cisco SNIC Driver Debugfs Support"

	depends on SCSI_SNIC && DEBUG_FS

	help

	  This enables to list debugging information from SNIC Driver

	  available via debugfs file system



config SCSI_DMX3191D

	tristate "DMX3191D SCSI support"

	depends on PCI && SCSI

drivers/scsi/Makefile

+1 −0
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@@ -39,6 +39,7 @@ obj-$(CONFIG_LIBFC) += libfc/ 
obj-$(CONFIG_LIBFCOE)		+= fcoe/

obj-$(CONFIG_FCOE)		+= fcoe/

obj-$(CONFIG_FCOE_FNIC)		+= fnic/

obj-$(CONFIG_SCSI_SNIC)		+= snic/

obj-$(CONFIG_SCSI_BNX2X_FCOE)	+= libfc/ fcoe/ bnx2fc/

obj-$(CONFIG_ISCSI_TCP) 	+= libiscsi.o	libiscsi_tcp.o iscsi_tcp.o

obj-$(CONFIG_INFINIBAND_ISER) 	+= libiscsi.o

drivers/scsi/snic/Makefile

0 → 100644
+17 −0
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obj-$(CONFIG_SCSI_SNIC) += snic.o



snic-y := \

	snic_attrs.o \

	snic_main.o \

	snic_res.o \

	snic_isr.o \

	snic_ctl.o \

	snic_io.o \

	snic_scsi.o \

	snic_disc.o \

	vnic_cq.o \

	vnic_intr.o \

	vnic_dev.o \

	vnic_wq.o



snic-$(CONFIG_SCSI_SNIC_DEBUG_FS) += snic_debugfs.o snic_trc.o

drivers/scsi/snic/cq_desc.h

0 → 100644
+77 −0
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/*

 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.

 *

 * This program is free software; you may redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 */



#ifndef _CQ_DESC_H_

#define _CQ_DESC_H_



/*

 * Completion queue descriptor types

 */

enum cq_desc_types {

	CQ_DESC_TYPE_WQ_ENET = 0,

	CQ_DESC_TYPE_DESC_COPY = 1,

	CQ_DESC_TYPE_WQ_EXCH = 2,

	CQ_DESC_TYPE_RQ_ENET = 3,

	CQ_DESC_TYPE_RQ_FCP = 4,

};



/* Completion queue descriptor: 16B

 *

 * All completion queues have this basic layout.  The

 * type_specific area is unique for each completion

 * queue type.

 */

struct cq_desc {

	__le16 completed_index;

	__le16 q_number;

	u8 type_specific[11];

	u8 type_color;

};



#define CQ_DESC_TYPE_BITS        4

#define CQ_DESC_TYPE_MASK        ((1 << CQ_DESC_TYPE_BITS) - 1)

#define CQ_DESC_COLOR_MASK       1

#define CQ_DESC_COLOR_SHIFT      7

#define CQ_DESC_Q_NUM_BITS       10

#define CQ_DESC_Q_NUM_MASK       ((1 << CQ_DESC_Q_NUM_BITS) - 1)

#define CQ_DESC_COMP_NDX_BITS    12

#define CQ_DESC_COMP_NDX_MASK    ((1 << CQ_DESC_COMP_NDX_BITS) - 1)



static inline void cq_desc_dec(const struct cq_desc *desc_arg,

	u8 *type, u8 *color, u16 *q_number, u16 *completed_index)

{

	const struct cq_desc *desc = desc_arg;

	const u8 type_color = desc->type_color;



	*color = (type_color >> CQ_DESC_COLOR_SHIFT) & CQ_DESC_COLOR_MASK;



	/*

	 * Make sure color bit is read from desc *before* other fields

	 * are read from desc.  Hardware guarantees color bit is last

	 * bit (byte) written.  Adding the rmb() prevents the compiler

	 * and/or CPU from reordering the reads which would potentially

	 * result in reading stale values.

	 */

	rmb();



	*type = type_color & CQ_DESC_TYPE_MASK;

	*q_number = le16_to_cpu(desc->q_number) & CQ_DESC_Q_NUM_MASK;

	*completed_index = le16_to_cpu(desc->completed_index) &

		CQ_DESC_COMP_NDX_MASK;

}



#endif /* _CQ_DESC_H_ */

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