linux/drivers/infiniband/hw/hfi1/vnic_sdma.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright(c) 2017 - 2018 Intel Corporation.
 */

/*
 * This file contains HFI1 support for VNIC SDMA functionality
 */

#include "sdma.h"
#include "vnic.h"

#define HFI1_VNIC_SDMA_Q_ACTIVE …
#define HFI1_VNIC_SDMA_Q_DEFERRED …

#define HFI1_VNIC_TXREQ_NAME_LEN …
#define HFI1_VNIC_SDMA_DESC_WTRMRK …

/*
 * struct vnic_txreq - VNIC transmit descriptor
 * @txreq: sdma transmit request
 * @sdma: vnic sdma pointer
 * @skb: skb to send
 * @pad: pad buffer
 * @plen: pad length
 * @pbc_val: pbc value
 */
struct vnic_txreq { … };

static void vnic_sdma_complete(struct sdma_txreq *txreq,
			       int status)
{ … }

static noinline int build_vnic_ulp_payload(struct sdma_engine *sde,
					   struct vnic_txreq *tx)
{ … }

static int build_vnic_tx_desc(struct sdma_engine *sde,
			      struct vnic_txreq *tx,
			      u64 pbc)
{ … }

/* setup the last plen bypes of pad */
static inline void hfi1_vnic_update_pad(unsigned char *pad, u8 plen)
{ … }

int hfi1_vnic_send_dma(struct hfi1_devdata *dd, u8 q_idx,
		       struct hfi1_vnic_vport_info *vinfo,
		       struct sk_buff *skb, u64 pbc, u8 plen)
{ … }

/*
 * hfi1_vnic_sdma_sleep - vnic sdma sleep function
 *
 * This function gets called from sdma_send_txreq() when there are not enough
 * sdma descriptors available to send the packet. It adds Tx queue's wait
 * structure to sdma engine's dmawait list to be woken up when descriptors
 * become available.
 */
static int hfi1_vnic_sdma_sleep(struct sdma_engine *sde,
				struct iowait_work *wait,
				struct sdma_txreq *txreq,
				uint seq,
				bool pkts_sent)
{ … }

/*
 * hfi1_vnic_sdma_wakeup - vnic sdma wakeup function
 *
 * This function gets called when SDMA descriptors becomes available and Tx
 * queue's wait structure was previously added to sdma engine's dmawait list.
 * It notifies the upper driver about Tx queue wakeup.
 */
static void hfi1_vnic_sdma_wakeup(struct iowait *wait, int reason)
{
	struct hfi1_vnic_sdma *vnic_sdma =
		container_of(wait, struct hfi1_vnic_sdma, wait);
	struct hfi1_vnic_vport_info *vinfo = vnic_sdma->vinfo;

	vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
	if (__netif_subqueue_stopped(vinfo->netdev, vnic_sdma->q_idx))
		netif_wake_subqueue(vinfo->netdev, vnic_sdma->q_idx);
};

inline bool hfi1_vnic_sdma_write_avail(struct hfi1_vnic_vport_info *vinfo,
				       u8 q_idx)
{ … }

void hfi1_vnic_sdma_init(struct hfi1_vnic_vport_info *vinfo)
{ … }

int hfi1_vnic_txreq_init(struct hfi1_devdata *dd)
{ … }

void hfi1_vnic_txreq_deinit(struct hfi1_devdata *dd)
{ … }