linux/drivers/net/ethernet/sfc/mcdi_functions.c

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2019 Solarflare Communications Inc.
 *
 * This program 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, incorporated herein by reference.
 */

#include "net_driver.h"
#include "efx.h"
#include "nic.h"
#include "mcdi_functions.h"
#include "mcdi.h"
#include "mcdi_pcol.h"

int efx_mcdi_free_vis(struct efx_nic *efx)
{
	MCDI_DECLARE_BUF_ERR(outbuf);
	size_t outlen;
	int rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FREE_VIS, NULL, 0,
				    outbuf, sizeof(outbuf), &outlen);

	/* -EALREADY means nothing to free, so ignore */
	if (rc == -EALREADY)
		rc = 0;
	if (rc)
		efx_mcdi_display_error(efx, MC_CMD_FREE_VIS, 0, outbuf, outlen,
				       rc);
	return rc;
}

int efx_mcdi_alloc_vis(struct efx_nic *efx, unsigned int min_vis,
		       unsigned int max_vis, unsigned int *vi_base,
		       unsigned int *allocated_vis)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_ALLOC_VIS_OUT_LEN);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_ALLOC_VIS_IN_LEN);
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MIN_VI_COUNT, min_vis);
	MCDI_SET_DWORD(inbuf, ALLOC_VIS_IN_MAX_VI_COUNT, max_vis);
	rc = efx_mcdi_rpc(efx, MC_CMD_ALLOC_VIS, inbuf, sizeof(inbuf),
			  outbuf, sizeof(outbuf), &outlen);
	if (rc != 0)
		return rc;

	if (outlen < MC_CMD_ALLOC_VIS_OUT_LEN)
		return -EIO;

	netif_dbg(efx, drv, efx->net_dev, "base VI is A0x%03x\n",
		  MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE));

	if (vi_base)
		*vi_base = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_BASE);
	if (allocated_vis)
		*allocated_vis = MCDI_DWORD(outbuf, ALLOC_VIS_OUT_VI_COUNT);
	return 0;
}

int efx_mcdi_ev_probe(struct efx_channel *channel)
{
	return efx_nic_alloc_buffer(channel->efx, &channel->eventq.buf,
				    (channel->eventq_mask + 1) *
				    sizeof(efx_qword_t),
				    GFP_KERNEL);
}

int efx_mcdi_ev_init(struct efx_channel *channel, bool v1_cut_thru, bool v2)
{
	MCDI_DECLARE_BUF(inbuf,
			 MC_CMD_INIT_EVQ_V2_IN_LEN(EFX_MAX_EVQ_SIZE * 8 /
						   EFX_BUF_SIZE));
	MCDI_DECLARE_BUF(outbuf, MC_CMD_INIT_EVQ_V2_OUT_LEN);
	size_t entries = channel->eventq.buf.len / EFX_BUF_SIZE;
	struct efx_nic *efx = channel->efx;
	struct efx_ef10_nic_data *nic_data;
	size_t inlen, outlen;
	dma_addr_t dma_addr;
	int rc, i;

	nic_data = efx->nic_data;

	/* Fill event queue with all ones (i.e. empty events) */
	memset(channel->eventq.buf.addr, 0xff, channel->eventq.buf.len);

	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_SIZE, channel->eventq_mask + 1);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_INSTANCE, channel->channel);
	/* INIT_EVQ expects index in vector table, not absolute */
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_IRQ_NUM, channel->channel);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_MODE,
		       MC_CMD_INIT_EVQ_IN_TMR_MODE_DIS);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_LOAD, 0);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_TMR_RELOAD, 0);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_MODE,
		       MC_CMD_INIT_EVQ_IN_COUNT_MODE_DIS);
	MCDI_SET_DWORD(inbuf, INIT_EVQ_IN_COUNT_THRSHLD, 0);

	if (v2) {
		/* Use the new generic approach to specifying event queue
		 * configuration, requesting lower latency or higher throughput.
		 * The options that actually get used appear in the output.
		 */
		MCDI_POPULATE_DWORD_2(inbuf, INIT_EVQ_V2_IN_FLAGS,
				      INIT_EVQ_V2_IN_FLAG_INTERRUPTING, 1,
				      INIT_EVQ_V2_IN_FLAG_TYPE,
				      MC_CMD_INIT_EVQ_V2_IN_FLAG_TYPE_AUTO);
	} else {
		MCDI_POPULATE_DWORD_4(inbuf, INIT_EVQ_IN_FLAGS,
				      INIT_EVQ_IN_FLAG_INTERRUPTING, 1,
				      INIT_EVQ_IN_FLAG_RX_MERGE, 1,
				      INIT_EVQ_IN_FLAG_TX_MERGE, 1,
				      INIT_EVQ_IN_FLAG_CUT_THRU, v1_cut_thru);
	}

	dma_addr = channel->eventq.buf.dma_addr;
	for (i = 0; i < entries; ++i) {
		MCDI_SET_ARRAY_QWORD(inbuf, INIT_EVQ_IN_DMA_ADDR, i, dma_addr);
		dma_addr += EFX_BUF_SIZE;
	}

	inlen = MC_CMD_INIT_EVQ_IN_LEN(entries);

	rc = efx_mcdi_rpc(efx, MC_CMD_INIT_EVQ, inbuf, inlen,
			  outbuf, sizeof(outbuf), &outlen);

	if (outlen >= MC_CMD_INIT_EVQ_V2_OUT_LEN)
		netif_dbg(efx, drv, efx->net_dev,
			  "Channel %d using event queue flags %08x\n",
			  channel->channel,
			  MCDI_DWORD(outbuf, INIT_EVQ_V2_OUT_FLAGS));

	return rc;
}

void efx_mcdi_ev_remove(struct efx_channel *channel)
{
	efx_nic_free_buffer(channel->efx, &channel->eventq.buf);
}

void efx_mcdi_ev_fini(struct efx_channel *channel)
{
	MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_EVQ_IN_LEN);
	MCDI_DECLARE_BUF_ERR(outbuf);
	struct efx_nic *efx = channel->efx;
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, FINI_EVQ_IN_INSTANCE, channel->channel);

	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_EVQ, inbuf, sizeof(inbuf),
				outbuf, sizeof(outbuf), &outlen);

	if (rc && rc != -EALREADY)
		goto fail;

	return;

fail:
	efx_mcdi_display_error(efx, MC_CMD_FINI_EVQ, MC_CMD_FINI_EVQ_IN_LEN,
			       outbuf, outlen, rc);
}

int efx_mcdi_tx_init(struct efx_tx_queue *tx_queue, bool tso_v2)
{
	MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 /
						       EFX_BUF_SIZE));
	bool csum_offload = tx_queue->queue & EFX_TXQ_TYPE_OFFLOAD;
	size_t entries = tx_queue->txd.buf.len / EFX_BUF_SIZE;
	struct efx_channel *channel = tx_queue->channel;
	struct efx_nic *efx = tx_queue->efx;
	struct efx_ef10_nic_data *nic_data;
	dma_addr_t dma_addr;
	size_t inlen;
	int rc, i;

	BUILD_BUG_ON(MC_CMD_INIT_TXQ_OUT_LEN != 0);

	nic_data = efx->nic_data;

	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_SIZE, tx_queue->ptr_mask + 1);
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_TARGET_EVQ, channel->channel);
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_LABEL, tx_queue->queue);
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_INSTANCE, tx_queue->queue);
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_OWNER_ID, 0);
	MCDI_SET_DWORD(inbuf, INIT_TXQ_IN_PORT_ID, nic_data->vport_id);

	dma_addr = tx_queue->txd.buf.dma_addr;

	netif_dbg(efx, hw, efx->net_dev, "pushing TXQ %d. %zu entries (%llx)\n",
		  tx_queue->queue, entries, (u64)dma_addr);

	for (i = 0; i < entries; ++i) {
		MCDI_SET_ARRAY_QWORD(inbuf, INIT_TXQ_IN_DMA_ADDR, i, dma_addr);
		dma_addr += EFX_BUF_SIZE;
	}

	inlen = MC_CMD_INIT_TXQ_IN_LEN(entries);

	do {
		MCDI_POPULATE_DWORD_4(inbuf, INIT_TXQ_IN_FLAGS,
				/* This flag was removed from mcdi_pcol.h for
				 * the non-_EXT version of INIT_TXQ.  However,
				 * firmware still honours it.
				 */
				INIT_TXQ_EXT_IN_FLAG_TSOV2_EN, tso_v2,
				INIT_TXQ_IN_FLAG_IP_CSUM_DIS, !csum_offload,
				INIT_TXQ_IN_FLAG_TCP_CSUM_DIS, !csum_offload,
				INIT_TXQ_EXT_IN_FLAG_TIMESTAMP,
						tx_queue->timestamping);

		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_INIT_TXQ, inbuf, inlen,
					NULL, 0, NULL);
		if (rc == -ENOSPC && tso_v2) {
			/* Retry without TSOv2 if we're short on contexts. */
			tso_v2 = false;
			netif_warn(efx, probe, efx->net_dev,
				   "TSOv2 context not available to segment in "
				   "hardware. TCP performance may be reduced.\n"
				   );
		} else if (rc) {
			efx_mcdi_display_error(efx, MC_CMD_INIT_TXQ,
					       MC_CMD_INIT_TXQ_EXT_IN_LEN,
					       NULL, 0, rc);
			goto fail;
		}
	} while (rc);

	return 0;

fail:
	return rc;
}

void efx_mcdi_tx_remove(struct efx_tx_queue *tx_queue)
{
	efx_nic_free_buffer(tx_queue->efx, &tx_queue->txd.buf);
}

void efx_mcdi_tx_fini(struct efx_tx_queue *tx_queue)
{
	MCDI_DECLARE_BUF(inbuf, MC_CMD_FINI_TXQ_IN_LEN);
	MCDI_DECLARE_BUF_ERR(outbuf);
	struct efx_nic *efx = tx_queue->efx;
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, FINI_TXQ_IN_INSTANCE,
		       tx_queue->queue);

	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_FINI_TXQ, inbuf, sizeof(inbuf),
				outbuf, sizeof(outbuf), &outlen);

	if (rc && rc != -EALREADY)
		goto fail;

	return;

fail:
	efx_mcdi_display_error(efx, MC_CMD_FINI_TXQ, MC_CMD_FINI_TXQ_IN_LEN,
			       outbuf, outlen, rc);
}