Release 4.7 drivers/net/ethernet/cavium/liquidio/octeon_nic.h
/**********************************************************************
* Author: Cavium, Inc.
*
* Contact: support@cavium.com
* Please include "LiquidIO" in the subject.
*
* Copyright (c) 2003-2015 Cavium, Inc.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium, Inc. for more information
**********************************************************************/
/*! \file octeon_nic.h
* \brief Host NIC Driver: Routine to send network data &
* control packet to Octeon.
*/
#ifndef __OCTEON_NIC_H__
#define __OCTEON_NIC_H__
/* Maximum number of 8-byte words can be sent in a NIC control message.
*/
#define MAX_NCTRL_UDD 32
typedef void (*octnic_ctrl_pkt_cb_fn_t) (void *);
/* Structure of control information passed by the NIC module to the OSI
* layer when sending control commands to Octeon device software.
*/
struct octnic_ctrl_pkt {
/** Command to be passed to the Octeon device software. */
union octnet_cmd ncmd;
/** Send buffer */
void *data;
u64 dmadata;
/** Response buffer */
void *rdata;
u64 dmardata;
/** Additional data that may be needed by some commands. */
u64 udd[MAX_NCTRL_UDD];
/** Time to wait for Octeon software to respond to this control command.
* If wait_time is 0, OSI assumes no response is expected.
*/
size_t wait_time;
/** The network device that issued the control command. */
u64 netpndev;
/** Callback function called when the command has been fetched */
octnic_ctrl_pkt_cb_fn_t cb_fn;
};
#define MAX_UDD_SIZE(nctrl) (sizeof(nctrl->udd))
/** Structure of data information passed by the NIC module to the OSI
* layer when forwarding data to Octeon device software.
*/
struct octnic_data_pkt {
/** Pointer to information maintained by NIC module for this packet. The
* OSI layer passes this as-is to the driver.
*/
void *buf;
/** Type of buffer passed in "buf" above. */
u32 reqtype;
/** Total data bytes to be transferred in this command. */
u32 datasize;
/** Command to be passed to the Octeon device software. */
struct octeon_instr_64B cmd;
/** Input queue to use to send this command. */
u32 q_no;
};
/** Structure passed by NIC module to OSI layer to prepare a command to send
* network data to Octeon.
*/
union octnic_cmd_setup {
struct {
u32 ifidx:8;
u32 cksum_offset:7;
u32 gather:1;
u32 timestamp:1;
u32 ipv4opts_ipv6exthdr:2;
u32 ip_csum:1;
u32 tnl_csum:1;
u32 rsvd:11;
union {
u32 datasize;
u32 gatherptrs;
}
u;
}
s;
u64 u64;
};
struct octnic_ctrl_params {
u32 resp_order;
};
static inline int octnet_iq_is_full(struct octeon_device *oct, u32 q_no)
{
return ((u32)atomic_read(&oct->instr_queue[q_no]->instr_pending)
>= (oct->instr_queue[q_no]->max_count - 2));
}
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/** Utility function to prepare a 64B NIC instruction based on a setup command
* @param cmd - pointer to instruction to be filled in.
* @param setup - pointer to the setup structure
* @param q_no - which queue for back pressure
*
* Assumes the cmd instruction is pre-allocated, but no fields are filled in.
*/
static inline void
octnet_prepare_pci_cmd(struct octeon_instr_64B *cmd,
union octnic_cmd_setup *setup, u32 tag)
{
struct octeon_instr_ih *ih;
struct octeon_instr_irh *irh;
union octnic_packet_params packet_params;
memset(cmd, 0, sizeof(struct octeon_instr_64B));
ih = (struct octeon_instr_ih *)&cmd->ih;
/* assume that rflag is cleared so therefore front data will only have
* irh and ossp[1] and ossp[2] for a total of 24 bytes
*/
ih->fsz = 24;
ih->tagtype = ORDERED_TAG;
ih->grp = DEFAULT_POW_GRP;
if (tag)
ih->tag = tag;
else
ih->tag = LIO_DATA(setup->s.ifidx);
ih->raw = 1;
ih->qos = (setup->s.ifidx & 3) + 4; /* map qos based on interface */
if (!setup->s.gather) {
ih->dlengsz = setup->s.u.datasize;
} else {
ih->gather = 1;
ih->dlengsz = setup->s.u.gatherptrs;
}
irh = (struct octeon_instr_irh *)&cmd->irh;
irh->opcode = OPCODE_NIC;
irh->subcode = OPCODE_NIC_NW_DATA;
packet_params.u32 = 0;
if (setup->s.cksum_offset) {
packet_params.s.csoffset = setup->s.cksum_offset;
packet_params.s.ipv4opts_ipv6exthdr =
setup->s.ipv4opts_ipv6exthdr;
}
packet_params.s.ip_csum = setup->s.ip_csum;
packet_params.s.tnl_csum = setup->s.tnl_csum;
packet_params.s.ifidx = setup->s.ifidx;
packet_params.s.tsflag = setup->s.timestamp;
irh->ossp = packet_params.u32;
}
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/** Allocate and a soft command with space for a response immediately following
* the commnad.
* @param oct - octeon device pointer
* @param cmd - pointer to the command structure, pre-filled for everything
* except the response.
* @param rdatasize - size in bytes of the response.
*
* @returns pointer to allocated buffer with command copied into it, and
* response space immediately following.
*/
void *
octeon_alloc_soft_command_resp(struct octeon_device *oct,
struct octeon_instr_64B *cmd,
size_t rdatasize);
/** Send a NIC data packet to the device
* @param oct - octeon device pointer
* @param ndata - control structure with queueing, and buffer information
*
* @returns IQ_FAILED if it failed to add to the input queue. IQ_STOP if it the
* queue should be stopped, and IQ_SEND_OK if it sent okay.
*/
int octnet_send_nic_data_pkt(struct octeon_device *oct,
struct octnic_data_pkt *ndata, u32 xmit_more);
/** Send a NIC control packet to the device
* @param oct - octeon device pointer
* @param nctrl - control structure with command, timout, and callback info
* @param nparams - response control structure
*
* @returns IQ_FAILED if it failed to add to the input queue. IQ_STOP if it the
* queue should be stopped, and IQ_SEND_OK if it sent okay.
*/
int
octnet_send_nic_ctrl_pkt(struct octeon_device *oct,
struct octnic_ctrl_pkt *nctrl,
struct octnic_ctrl_params nparams);
#endif
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