path: root/drivers/net/bnxt/bnxt_txr.c

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) Broadcom Limited.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Broadcom Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <inttypes.h>

#include <rte_byteorder.h>
#include <rte_malloc.h>

#include "bnxt.h"
#include "bnxt_cpr.h"
#include "bnxt_ring.h"
#include "bnxt_txq.h"
#include "bnxt_txr.h"
#include "hsi_struct_def_dpdk.h"
#include <stdbool.h>

/*
 * TX Ring handling
 */

void bnxt_free_tx_rings(struct bnxt *bp)
{
	int i;

	for (i = 0; i < (int)bp->tx_nr_rings; i++) {
		struct bnxt_tx_queue *txq = bp->tx_queues[i];

		if (!txq)
			continue;

		bnxt_free_ring(txq->tx_ring->tx_ring_struct);
		rte_free(txq->tx_ring->tx_ring_struct);
		rte_free(txq->tx_ring);

		bnxt_free_ring(txq->cp_ring->cp_ring_struct);
		rte_free(txq->cp_ring->cp_ring_struct);
		rte_free(txq->cp_ring);

		rte_free(txq);
		bp->tx_queues[i] = NULL;
	}
}

int bnxt_init_one_tx_ring(struct bnxt_tx_queue *txq)
{
	struct bnxt_tx_ring_info *txr = txq->tx_ring;
	struct bnxt_ring *ring = txr->tx_ring_struct;

	txq->tx_wake_thresh = ring->ring_size / 2;
	ring->fw_ring_id = INVALID_HW_RING_ID;

	return 0;
}

int bnxt_init_tx_ring_struct(struct bnxt_tx_queue *txq, unsigned int socket_id)
{
	struct bnxt_cp_ring_info *cpr;
	struct bnxt_tx_ring_info *txr;
	struct bnxt_ring *ring;

	txr = rte_zmalloc_socket("bnxt_tx_ring",
				 sizeof(struct bnxt_tx_ring_info),
				 RTE_CACHE_LINE_SIZE, socket_id);
	if (txr == NULL)
		return -ENOMEM;
	txq->tx_ring = txr;

	ring = rte_zmalloc_socket("bnxt_tx_ring_struct",
				  sizeof(struct bnxt_ring),
				  RTE_CACHE_LINE_SIZE, socket_id);
	if (ring == NULL)
		return -ENOMEM;
	txr->tx_ring_struct = ring;
	ring->ring_size = rte_align32pow2(txq->nb_tx_desc + 1);
	ring->ring_mask = ring->ring_size - 1;
	ring->bd = (void *)txr->tx_desc_ring;
	ring->bd_dma = txr->tx_desc_mapping;
	ring->vmem_size = ring->ring_size * sizeof(struct bnxt_sw_tx_bd);
	ring->vmem = (void **)&txr->tx_buf_ring;

	cpr = rte_zmalloc_socket("bnxt_tx_ring",
				 sizeof(struct bnxt_cp_ring_info),
				 RTE_CACHE_LINE_SIZE, socket_id);
	if (cpr == NULL)
		return -ENOMEM;
	txq->cp_ring = cpr;

	ring = rte_zmalloc_socket("bnxt_tx_ring_struct",
				  sizeof(struct bnxt_ring),
				  RTE_CACHE_LINE_SIZE, socket_id);
	if (ring == NULL)
		return -ENOMEM;
	cpr->cp_ring_struct = ring;
	ring->ring_size = txr->tx_ring_struct->ring_size;
	ring->ring_mask = ring->ring_size - 1;
	ring->bd = (void *)cpr->cp_desc_ring;
	ring->bd_dma = cpr->cp_desc_mapping;
	ring->vmem_size = 0;
	ring->vmem = NULL;

	return 0;
}

static inline uint32_t bnxt_tx_avail(struct bnxt_tx_ring_info *txr)
{
	/* Tell compiler to fetch tx indices from memory. */
	rte_compiler_barrier();

	return txr->tx_ring_struct->ring_size -
		((txr->tx_prod - txr->tx_cons) &
			txr->tx_ring_struct->ring_mask) - 1;
}

static uint16_t bnxt_start_xmit(struct rte_mbuf *tx_pkt,
				struct bnxt_tx_queue *txq)
{
	struct bnxt_tx_ring_info *txr = txq->tx_ring;
	struct tx_bd_long *txbd;
	struct tx_bd_long_hi *txbd1;
	uint32_t vlan_tag_flags, cfa_action;
	bool long_bd = false;
	uint16_t last_prod = 0;
	struct rte_mbuf *m_seg;
	struct bnxt_sw_tx_bd *tx_buf;
	static const uint32_t lhint_arr[4] = {
		TX_BD_LONG_FLAGS_LHINT_LT512,
		TX_BD_LONG_FLAGS_LHINT_LT1K,
		TX_BD_LONG_FLAGS_LHINT_LT2K,
		TX_BD_LONG_FLAGS_LHINT_LT2K
	};

	if (tx_pkt->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_TCP_CKSUM |
				PKT_TX_UDP_CKSUM | PKT_TX_IP_CKSUM |
				PKT_TX_VLAN_PKT))
		long_bd = true;

	tx_buf = &txr->tx_buf_ring[txr->tx_prod];
	tx_buf->mbuf = tx_pkt;
	tx_buf->nr_bds = long_bd + tx_pkt->nb_segs;
	last_prod = (txr->tx_prod + tx_buf->nr_bds - 1) &
				txr->tx_ring_struct->ring_mask;

	if (unlikely(bnxt_tx_avail(txr) < tx_buf->nr_bds))
		return -ENOMEM;

	txbd = &txr->tx_desc_ring[txr->tx_prod];
	txbd->opaque = txr->tx_prod;
	txbd->flags_type = tx_buf->nr_bds << TX_BD_LONG_FLAGS_BD_CNT_SFT;
	txbd->len = tx_pkt->data_len;
	if (txbd->len >= 2014)
		txbd->flags_type |= TX_BD_LONG_FLAGS_LHINT_GTE2K;
	else
		txbd->flags_type |= lhint_arr[txbd->len >> 9];
	txbd->addr = rte_cpu_to_le_32(RTE_MBUF_DATA_DMA_ADDR(tx_buf->mbuf));

	if (long_bd) {
		txbd->flags_type |= TX_BD_LONG_TYPE_TX_BD_LONG;
		vlan_tag_flags = 0;
		cfa_action = 0;
		if (tx_buf->mbuf->ol_flags & PKT_TX_VLAN_PKT) {
			/* shurd: Should this mask at
			 * TX_BD_LONG_CFA_META_VLAN_VID_MASK?
			 */
			vlan_tag_flags = TX_BD_LONG_CFA_META_KEY_VLAN_TAG |
				tx_buf->mbuf->vlan_tci;
			/* Currently supports 8021Q, 8021AD vlan offloads
			 * QINQ1, QINQ2, QINQ3 vlan headers are deprecated
			 */
			/* DPDK only supports 802.11q VLAN packets */
			vlan_tag_flags |=
					TX_BD_LONG_CFA_META_VLAN_TPID_TPID8100;
		}

		txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);

		txbd1 = (struct tx_bd_long_hi *)
					&txr->tx_desc_ring[txr->tx_prod];
		txbd1->lflags = 0;
		txbd1->cfa_meta = vlan_tag_flags;
		txbd1->cfa_action = cfa_action;

		if (tx_pkt->ol_flags & PKT_TX_TCP_SEG) {
			/* TSO */
			txbd1->lflags = TX_BD_LONG_LFLAGS_LSO;
			txbd1->hdr_size = tx_pkt->l2_len + tx_pkt->l3_len +
					tx_pkt->l4_len;
			txbd1->mss = tx_pkt->tso_segsz;

		} else if (tx_pkt->ol_flags & (PKT_TX_TCP_CKSUM |
					PKT_TX_UDP_CKSUM)) {
			/* TCP/UDP CSO */
			txbd1->lflags = TX_BD_LONG_LFLAGS_TCP_UDP_CHKSUM;
			txbd1->mss = 0;

		} else if (tx_pkt->ol_flags & PKT_TX_IP_CKSUM) {
			/* IP CSO */
			txbd1->lflags = TX_BD_LONG_LFLAGS_IP_CHKSUM;
			txbd1->mss = 0;
		}
	} else {
		txbd->flags_type |= TX_BD_SHORT_TYPE_TX_BD_SHORT;
	}

	m_seg = tx_pkt->next;
	/* i is set at the end of the if(long_bd) block */
	while (txr->tx_prod != last_prod) {
		txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);
		tx_buf = &txr->tx_buf_ring[txr->tx_prod];

		txbd = &txr->tx_desc_ring[txr->tx_prod];
		txbd->addr = rte_cpu_to_le_32(RTE_MBUF_DATA_DMA_ADDR(m_seg));
		txbd->flags_type = TX_BD_SHORT_TYPE_TX_BD_SHORT;
		txbd->len = m_seg->data_len;

		m_seg = m_seg->next;
	}

	txbd->flags_type |= TX_BD_LONG_FLAGS_PACKET_END;

	txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);

	return 0;
}

static void bnxt_tx_cmp(struct bnxt_tx_queue *txq, int nr_pkts)
{
	struct bnxt_tx_ring_info *txr = txq->tx_ring;
	uint16_t cons = txr->tx_cons;
	int i, j;

	for (i = 0; i < nr_pkts; i++) {
		struct bnxt_sw_tx_bd *tx_buf;
		struct rte_mbuf *mbuf;

		tx_buf = &txr->tx_buf_ring[cons];
		cons = RING_NEXT(txr->tx_ring_struct, cons);
		mbuf = tx_buf->mbuf;
		tx_buf->mbuf = NULL;

		/* EW - no need to unmap DMA memory? */

		for (j = 1; j < tx_buf->nr_bds; j++)
			cons = RING_NEXT(txr->tx_ring_struct, cons);
		rte_pktmbuf_free(mbuf);
	}

	txr->tx_cons = cons;
}

static int bnxt_handle_tx_cp(struct bnxt_tx_queue *txq)
{
	struct bnxt_cp_ring_info *cpr = txq->cp_ring;
	uint32_t raw_cons = cpr->cp_raw_cons;
	uint32_t cons;
	int nb_tx_pkts = 0;
	struct tx_cmpl *txcmp;

	if ((txq->tx_ring->tx_ring_struct->ring_size -
			(bnxt_tx_avail(txq->tx_ring))) >
			txq->tx_free_thresh) {
		while (1) {
			cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
			txcmp = (struct tx_cmpl *)&cpr->cp_desc_ring[cons];

			if (!CMP_VALID(txcmp, raw_cons, cpr->cp_ring_struct))
				break;

			if (CMP_TYPE(txcmp) == TX_CMPL_TYPE_TX_L2)
				nb_tx_pkts++;
			else
				RTE_LOG(DEBUG, PMD,
						"Unhandled CMP type %02x\n",
						CMP_TYPE(txcmp));
			raw_cons = NEXT_RAW_CMP(raw_cons);
		}
		if (nb_tx_pkts)
			bnxt_tx_cmp(txq, nb_tx_pkts);
		cpr->cp_raw_cons = raw_cons;
		B_CP_DIS_DB(cpr, cpr->cp_raw_cons);
	}
	return nb_tx_pkts;
}

uint16_t bnxt_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
			       uint16_t nb_pkts)
{
	struct bnxt_tx_queue *txq = tx_queue;
	uint16_t nb_tx_pkts = 0;
	uint16_t db_mask = txq->tx_ring->tx_ring_struct->ring_size >> 2;
	uint16_t last_db_mask = 0;

	/* Handle TX completions */
	bnxt_handle_tx_cp(txq);

	/* Handle TX burst request */
	for (nb_tx_pkts = 0; nb_tx_pkts < nb_pkts; nb_tx_pkts++) {
		if (bnxt_start_xmit(tx_pkts[nb_tx_pkts], txq)) {
			break;
		} else if ((nb_tx_pkts & db_mask) != last_db_mask) {
			B_TX_DB(txq->tx_ring->tx_doorbell,
					txq->tx_ring->tx_prod);
			last_db_mask = nb_tx_pkts & db_mask;
		}
	}
	if (nb_tx_pkts)
		B_TX_DB(txq->tx_ring->tx_doorbell, txq->tx_ring->tx_prod);

	return nb_tx_pkts;
}