cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/cisco/enic/vnic_wq.h

/*
 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova 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 _VNIC_WQ_H_

#define _VNIC_WQ_H_

#include <linux/pci.h>

#include "vnic_dev.h"
#include "vnic_cq.h"

/* Work queue control */

struct vnic_wq_ctrl {
	
u64 ring_base;			/* 0x00 */
	
u32 ring_size;			/* 0x08 */
	
u32 pad0;
	
u32 posted_index;		/* 0x10 */
	
u32 pad1;
	
u32 cq_index;			/* 0x18 */
	
u32 pad2;
	
u32 enable;			/* 0x20 */
	
u32 pad3;
	
u32 running;			/* 0x28 */
	
u32 pad4;
	
u32 fetch_index;		/* 0x30 */
	
u32 pad5;
	
u32 dca_value;			/* 0x38 */
	
u32 pad6;
	
u32 error_interrupt_enable;	/* 0x40 */
	
u32 pad7;
	
u32 error_interrupt_offset;	/* 0x48 */
	
u32 pad8;
	
u32 error_status;		/* 0x50 */
	
u32 pad9;
};


struct vnic_wq_buf {
	
struct vnic_wq_buf *next;
	
dma_addr_t dma_addr;
	
void *os_buf;
	
unsigned int len;
	
unsigned int index;
	
int sop;
	
void *desc;
	
uint64_t wr_id; /* Cookie */
	
uint8_t cq_entry; /* Gets completion event from hw */
	
uint8_t desc_skip_cnt; /* Num descs to occupy */
	
uint8_t compressed_send; /* Both hdr and payload in one desc */
	
struct vnic_wq_buf *prev;
};

/* Break the vnic_wq_buf allocations into blocks of 32/64 entries */

#define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32

#define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64

#define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
	((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
        VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))

#define VNIC_WQ_BUF_BLK_SZ(entries) \
	(VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))

#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
	DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))

#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)


struct vnic_wq {
	
unsigned int index;
	
struct vnic_dev *vdev;
	
struct vnic_wq_ctrl __iomem *ctrl;              /* memory-mapped */
	
struct vnic_dev_ring ring;
	
struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
	
struct vnic_wq_buf *to_use;
	
struct vnic_wq_buf *to_clean;
	
unsigned int pkts_outstanding;
};


struct devcmd2_controller {
	
struct vnic_wq_ctrl __iomem *wq_ctrl;
	
struct vnic_devcmd2 *cmd_ring;
	
struct devcmd2_result *result;
	
u16 next_result;
	
u16 result_size;
	
int color;
	
struct vnic_dev_ring results_ring;
	
struct vnic_wq wq;
	
u32 posted;
};


static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq) { /* how many does SW own? */ return wq->ring.desc_avail; }

Contributors

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Scott Feldman21100.00%1100.00%
Total21100.00%1100.00%


static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq) { /* how many does HW own? */ return wq->ring.desc_count - wq->ring.desc_avail - 1; }

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Scott Feldman29100.00%1100.00%
Total29100.00%1100.00%


static inline void *vnic_wq_next_desc(struct vnic_wq *wq) { return wq->to_use->desc; }

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Scott Feldman20100.00%1100.00%
Total20100.00%1100.00%


static inline void vnic_wq_doorbell(struct vnic_wq *wq) { /* Adding write memory barrier prevents compiler and/or CPU * reordering, thus avoiding descriptor posting before * descriptor is initialized. Otherwise, hardware can read * stale descriptor fields. */ wmb(); iowrite32(wq->to_use->index, &wq->ctrl->posted_index); }

Contributors

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Govindarajulu Varadarajan32100.00%1100.00%
Total32100.00%1100.00%


static inline void vnic_wq_post(struct vnic_wq *wq, void *os_buf, dma_addr_t dma_addr, unsigned int len, int sop, int eop, uint8_t desc_skip_cnt, uint8_t cq_entry, uint8_t compressed_send, uint64_t wrid) { struct vnic_wq_buf *buf = wq->to_use; buf->sop = sop; buf->cq_entry = cq_entry; buf->compressed_send = compressed_send; buf->desc_skip_cnt = desc_skip_cnt; buf->os_buf = eop ? os_buf : NULL; buf->dma_addr = dma_addr; buf->len = len; buf->wr_id = wrid; buf = buf->next; wq->to_use = buf; wq->ring.desc_avail -= desc_skip_cnt; }

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Scott Feldman8468.85%150.00%
Neel Patel3831.15%150.00%
Total122100.00%2100.00%


static inline void vnic_wq_service(struct vnic_wq *wq, struct cq_desc *cq_desc, u16 completed_index, void (*buf_service)(struct vnic_wq *wq, struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), void *opaque) { struct vnic_wq_buf *buf; buf = wq->to_clean; while (1) { (*buf_service)(wq, cq_desc, buf, opaque); wq->ring.desc_avail++; wq->to_clean = buf->next; if (buf->index == completed_index) break; buf = wq->to_clean; } }

Contributors

PersonTokensPropCommitsCommitProp
Scott Feldman111100.00%1100.00%
Total111100.00%1100.00%

void vnic_wq_free(struct vnic_wq *wq); int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, unsigned int desc_count, unsigned int desc_size); void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, unsigned int error_interrupt_enable, unsigned int error_interrupt_offset); unsigned int vnic_wq_error_status(struct vnic_wq *wq); void vnic_wq_enable(struct vnic_wq *wq); int vnic_wq_disable(struct vnic_wq *wq); void vnic_wq_clean(struct vnic_wq *wq, void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int desc_count, unsigned int desc_size); void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, unsigned int fetch_index, unsigned int posted_index, unsigned int error_interrupt_enable, unsigned int error_interrupt_offset); #endif /* _VNIC_WQ_H_ */

Overall Contributors

PersonTokensPropCommitsCommitProp
Scott Feldman57073.74%110.00%
Govindarajulu Varadarajan12716.43%550.00%
Neel Patel546.99%110.00%
Vasanthy Kolluri202.59%220.00%
David S. Miller20.26%110.00%
Total773100.00%10100.00%
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