--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright (c) 2016-2017 Solarflare Communications Inc.
+ * All rights reserved.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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 "sfc.h"
+#include "sfc_debug.h"
+#include "sfc_log.h"
+#include "sfc_ev.h"
+#include "sfc_tx.h"
+#include "sfc_tweak.h"
+#include "sfc_kvargs.h"
+
+/*
+ * Maximum number of TX queue flush attempts in case of
+ * failure or flush timeout
+ */
+#define SFC_TX_QFLUSH_ATTEMPTS (3)
+
+/*
+ * Time to wait between event queue polling attempts when waiting for TX
+ * queue flush done or flush failed events
+ */
+#define SFC_TX_QFLUSH_POLL_WAIT_MS (1)
+
+/*
+ * Maximum number of event queue polling attempts when waiting for TX queue
+ * flush done or flush failed events; it defines TX queue flush attempt timeout
+ * together with SFC_TX_QFLUSH_POLL_WAIT_MS
+ */
+#define SFC_TX_QFLUSH_POLL_ATTEMPTS (2000)
+
+static int
+sfc_tx_qcheck_conf(struct sfc_adapter *sa, uint16_t nb_tx_desc,
+ const struct rte_eth_txconf *tx_conf)
+{
+ unsigned int flags = tx_conf->txq_flags;
+ const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
+ int rc = 0;
+
+ if (tx_conf->tx_rs_thresh != 0) {
+ sfc_err(sa, "RS bit in transmit descriptor is not supported");
+ rc = EINVAL;
+ }
+
+ if (tx_conf->tx_free_thresh > EFX_TXQ_LIMIT(nb_tx_desc)) {
+ sfc_err(sa,
+ "TxQ free threshold too large: %u vs maximum %u",
+ tx_conf->tx_free_thresh, EFX_TXQ_LIMIT(nb_tx_desc));
+ rc = EINVAL;
+ }
+
+ if (tx_conf->tx_thresh.pthresh != 0 ||
+ tx_conf->tx_thresh.hthresh != 0 ||
+ tx_conf->tx_thresh.wthresh != 0) {
+ sfc_err(sa,
+ "prefetch/host/writeback thresholds are not supported");
+ rc = EINVAL;
+ }
+
+ if (((flags & ETH_TXQ_FLAGS_NOMULTSEGS) == 0) &&
+ (~sa->dp_tx->features & SFC_DP_TX_FEAT_MULTI_SEG)) {
+ sfc_err(sa, "Multi-segment is not supported by %s datapath",
+ sa->dp_tx->dp.name);
+ rc = EINVAL;
+ }
+
+ if ((flags & ETH_TXQ_FLAGS_NOVLANOFFL) == 0) {
+ if (!encp->enc_hw_tx_insert_vlan_enabled) {
+ sfc_err(sa, "VLAN offload is not supported");
+ rc = EINVAL;
+ } else if (~sa->dp_tx->features & SFC_DP_TX_FEAT_VLAN_INSERT) {
+ sfc_err(sa,
+ "VLAN offload is not supported by %s datapath",
+ sa->dp_tx->dp.name);
+ rc = EINVAL;
+ }
+ }
+
+ if ((flags & ETH_TXQ_FLAGS_NOXSUMSCTP) == 0) {
+ sfc_err(sa, "SCTP offload is not supported");
+ rc = EINVAL;
+ }
+
+ /* We either perform both TCP and UDP offload, or no offload at all */
+ if (((flags & ETH_TXQ_FLAGS_NOXSUMTCP) == 0) !=
+ ((flags & ETH_TXQ_FLAGS_NOXSUMUDP) == 0)) {
+ sfc_err(sa, "TCP and UDP offloads can't be set independently");
+ rc = EINVAL;
+ }
+
+ return rc;
+}
+
+void
+sfc_tx_qflush_done(struct sfc_txq *txq)
+{
+ txq->state |= SFC_TXQ_FLUSHED;
+ txq->state &= ~SFC_TXQ_FLUSHING;
+}
+
+int
+sfc_tx_qinit(struct sfc_adapter *sa, unsigned int sw_index,
+ uint16_t nb_tx_desc, unsigned int socket_id,
+ const struct rte_eth_txconf *tx_conf)
+{
+ const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
+ struct sfc_txq_info *txq_info;
+ struct sfc_evq *evq;
+ struct sfc_txq *txq;
+ int rc = 0;
+ struct sfc_dp_tx_qcreate_info info;
+
+ sfc_log_init(sa, "TxQ = %u", sw_index);
+
+ rc = sfc_tx_qcheck_conf(sa, nb_tx_desc, tx_conf);
+ if (rc != 0)
+ goto fail_bad_conf;
+
+ SFC_ASSERT(sw_index < sa->txq_count);
+ txq_info = &sa->txq_info[sw_index];
+
+ SFC_ASSERT(nb_tx_desc <= sa->txq_max_entries);
+ txq_info->entries = nb_tx_desc;
+
+ rc = sfc_ev_qinit(sa, SFC_EVQ_TYPE_TX, sw_index,
+ txq_info->entries, socket_id, &evq);
+ if (rc != 0)
+ goto fail_ev_qinit;
+
+ rc = ENOMEM;
+ txq = rte_zmalloc_socket("sfc-txq", sizeof(*txq), 0, socket_id);
+ if (txq == NULL)
+ goto fail_txq_alloc;
+
+ txq_info->txq = txq;
+
+ txq->hw_index = sw_index;
+ txq->evq = evq;
+ txq->free_thresh =
+ (tx_conf->tx_free_thresh) ? tx_conf->tx_free_thresh :
+ SFC_TX_DEFAULT_FREE_THRESH;
+ txq->flags = tx_conf->txq_flags;
+
+ rc = sfc_dma_alloc(sa, "txq", sw_index, EFX_TXQ_SIZE(txq_info->entries),
+ socket_id, &txq->mem);
+ if (rc != 0)
+ goto fail_dma_alloc;
+
+ memset(&info, 0, sizeof(info));
+ info.free_thresh = txq->free_thresh;
+ info.flags = tx_conf->txq_flags;
+ info.txq_entries = txq_info->entries;
+ info.dma_desc_size_max = encp->enc_tx_dma_desc_size_max;
+ info.txq_hw_ring = txq->mem.esm_base;
+ info.evq_entries = txq_info->entries;
+ info.evq_hw_ring = evq->mem.esm_base;
+ info.hw_index = txq->hw_index;
+ info.mem_bar = sa->mem_bar.esb_base;
+
+ rc = sa->dp_tx->qcreate(sa->eth_dev->data->port_id, sw_index,
+ &SFC_DEV_TO_PCI(sa->eth_dev)->addr,
+ socket_id, &info, &txq->dp);
+ if (rc != 0)
+ goto fail_dp_tx_qinit;
+
+ evq->dp_txq = txq->dp;
+
+ txq->state = SFC_TXQ_INITIALIZED;
+
+ txq_info->deferred_start = (tx_conf->tx_deferred_start != 0);
+
+ return 0;
+
+fail_dp_tx_qinit:
+ sfc_dma_free(sa, &txq->mem);
+
+fail_dma_alloc:
+ txq_info->txq = NULL;
+ rte_free(txq);
+
+fail_txq_alloc:
+ sfc_ev_qfini(evq);
+
+fail_ev_qinit:
+ txq_info->entries = 0;
+
+fail_bad_conf:
+ sfc_log_init(sa, "failed (TxQ = %u, rc = %d)", sw_index, rc);
+ return rc;
+}
+
+void
+sfc_tx_qfini(struct sfc_adapter *sa, unsigned int sw_index)
+{
+ struct sfc_txq_info *txq_info;
+ struct sfc_txq *txq;
+
+ sfc_log_init(sa, "TxQ = %u", sw_index);
+
+ SFC_ASSERT(sw_index < sa->txq_count);
+ txq_info = &sa->txq_info[sw_index];
+
+ txq = txq_info->txq;
+ SFC_ASSERT(txq != NULL);
+ SFC_ASSERT(txq->state == SFC_TXQ_INITIALIZED);
+
+ sa->dp_tx->qdestroy(txq->dp);
+ txq->dp = NULL;
+
+ txq_info->txq = NULL;
+ txq_info->entries = 0;
+
+ sfc_dma_free(sa, &txq->mem);
+
+ sfc_ev_qfini(txq->evq);
+ txq->evq = NULL;
+
+ rte_free(txq);
+}
+
+static int
+sfc_tx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
+{
+ sfc_log_init(sa, "TxQ = %u", sw_index);
+
+ return 0;
+}
+
+static int
+sfc_tx_check_mode(struct sfc_adapter *sa, const struct rte_eth_txmode *txmode)
+{
+ int rc = 0;
+
+ switch (txmode->mq_mode) {
+ case ETH_MQ_TX_NONE:
+ break;
+ default:
+ sfc_err(sa, "Tx multi-queue mode %u not supported",
+ txmode->mq_mode);
+ rc = EINVAL;
+ }
+
+ /*
+ * These features are claimed to be i40e-specific,
+ * but it does make sense to double-check their absence
+ */
+ if (txmode->hw_vlan_reject_tagged) {
+ sfc_err(sa, "Rejecting tagged packets not supported");
+ rc = EINVAL;
+ }
+
+ if (txmode->hw_vlan_reject_untagged) {
+ sfc_err(sa, "Rejecting untagged packets not supported");
+ rc = EINVAL;
+ }
+
+ if (txmode->hw_vlan_insert_pvid) {
+ sfc_err(sa, "Port-based VLAN insertion not supported");
+ rc = EINVAL;
+ }
+
+ return rc;
+}
+
+/**
+ * Destroy excess queues that are no longer needed after reconfiguration
+ * or complete close.
+ */
+static void
+sfc_tx_fini_queues(struct sfc_adapter *sa, unsigned int nb_tx_queues)
+{
+ int sw_index;
+
+ SFC_ASSERT(nb_tx_queues <= sa->txq_count);
+
+ sw_index = sa->txq_count;
+ while (--sw_index >= (int)nb_tx_queues) {
+ if (sa->txq_info[sw_index].txq != NULL)
+ sfc_tx_qfini(sa, sw_index);
+ }
+
+ sa->txq_count = nb_tx_queues;
+}
+
+int
+sfc_tx_configure(struct sfc_adapter *sa)
+{
+ const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
+ const struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
+ const unsigned int nb_tx_queues = sa->eth_dev->data->nb_tx_queues;
+ int rc = 0;
+
+ sfc_log_init(sa, "nb_tx_queues=%u (old %u)",
+ nb_tx_queues, sa->txq_count);
+
+ /*
+ * The datapath implementation assumes absence of boundary
+ * limits on Tx DMA descriptors. Addition of these checks on
+ * datapath would simply make the datapath slower.
+ */
+ if (encp->enc_tx_dma_desc_boundary != 0) {
+ rc = ENOTSUP;
+ goto fail_tx_dma_desc_boundary;
+ }
+
+ rc = sfc_tx_check_mode(sa, &dev_conf->txmode);
+ if (rc != 0)
+ goto fail_check_mode;
+
+ if (nb_tx_queues == sa->txq_count)
+ goto done;
+
+ if (sa->txq_info == NULL) {
+ sa->txq_info = rte_calloc_socket("sfc-txqs", nb_tx_queues,
+ sizeof(sa->txq_info[0]), 0,
+ sa->socket_id);
+ if (sa->txq_info == NULL)
+ goto fail_txqs_alloc;
+ } else {
+ struct sfc_txq_info *new_txq_info;
+
+ if (nb_tx_queues < sa->txq_count)
+ sfc_tx_fini_queues(sa, nb_tx_queues);
+
+ new_txq_info =
+ rte_realloc(sa->txq_info,
+ nb_tx_queues * sizeof(sa->txq_info[0]), 0);
+ if (new_txq_info == NULL && nb_tx_queues > 0)
+ goto fail_txqs_realloc;
+
+ sa->txq_info = new_txq_info;
+ if (nb_tx_queues > sa->txq_count)
+ memset(&sa->txq_info[sa->txq_count], 0,
+ (nb_tx_queues - sa->txq_count) *
+ sizeof(sa->txq_info[0]));
+ }
+
+ while (sa->txq_count < nb_tx_queues) {
+ rc = sfc_tx_qinit_info(sa, sa->txq_count);
+ if (rc != 0)
+ goto fail_tx_qinit_info;
+
+ sa->txq_count++;
+ }
+
+done:
+ return 0;
+
+fail_tx_qinit_info:
+fail_txqs_realloc:
+fail_txqs_alloc:
+ sfc_tx_close(sa);
+
+fail_check_mode:
+fail_tx_dma_desc_boundary:
+ sfc_log_init(sa, "failed (rc = %d)", rc);
+ return rc;
+}
+
+void
+sfc_tx_close(struct sfc_adapter *sa)
+{
+ sfc_tx_fini_queues(sa, 0);
+
+ rte_free(sa->txq_info);
+ sa->txq_info = NULL;
+}
+
+int
+sfc_tx_qstart(struct sfc_adapter *sa, unsigned int sw_index)
+{
+ struct rte_eth_dev_data *dev_data;
+ struct sfc_txq_info *txq_info;
+ struct sfc_txq *txq;
+ struct sfc_evq *evq;
+ uint16_t flags;
+ unsigned int desc_index;
+ int rc = 0;
+
+ sfc_log_init(sa, "TxQ = %u", sw_index);
+
+ SFC_ASSERT(sw_index < sa->txq_count);
+ txq_info = &sa->txq_info[sw_index];
+
+ txq = txq_info->txq;
+
+ SFC_ASSERT(txq->state == SFC_TXQ_INITIALIZED);
+
+ evq = txq->evq;
+
+ rc = sfc_ev_qstart(evq, sfc_evq_index_by_txq_sw_index(sa, sw_index));
+ if (rc != 0)
+ goto fail_ev_qstart;
+
+ /*
+ * It seems that DPDK has no controls regarding IPv4 offloads,
+ * hence, we always enable it here
+ */
+ if ((txq->flags & ETH_TXQ_FLAGS_NOXSUMTCP) ||
+ (txq->flags & ETH_TXQ_FLAGS_NOXSUMUDP)) {
+ flags = EFX_TXQ_CKSUM_IPV4;
+ } else {
+ flags = EFX_TXQ_CKSUM_IPV4 | EFX_TXQ_CKSUM_TCPUDP;
+
+ if (sa->tso)
+ flags |= EFX_TXQ_FATSOV2;
+ }
+
+ rc = efx_tx_qcreate(sa->nic, sw_index, 0, &txq->mem,
+ txq_info->entries, 0 /* not used on EF10 */,
+ flags, evq->common,
+ &txq->common, &desc_index);
+ if (rc != 0) {
+ if (sa->tso && (rc == ENOSPC))
+ sfc_err(sa, "ran out of TSO contexts");
+
+ goto fail_tx_qcreate;
+ }
+
+ efx_tx_qenable(txq->common);
+
+ txq->state |= SFC_TXQ_STARTED;
+
+ rc = sa->dp_tx->qstart(txq->dp, evq->read_ptr, desc_index);
+ if (rc != 0)
+ goto fail_dp_qstart;
+
+ /*
+ * It seems to be used by DPDK for debug purposes only ('rte_ether')
+ */
+ dev_data = sa->eth_dev->data;
+ dev_data->tx_queue_state[sw_index] = RTE_ETH_QUEUE_STATE_STARTED;
+
+ return 0;
+
+fail_dp_qstart:
+ txq->state = SFC_TXQ_INITIALIZED;
+ efx_tx_qdestroy(txq->common);
+
+fail_tx_qcreate:
+ sfc_ev_qstop(evq);
+
+fail_ev_qstart:
+ return rc;
+}
+
+void
+sfc_tx_qstop(struct sfc_adapter *sa, unsigned int sw_index)
+{
+ struct rte_eth_dev_data *dev_data;
+ struct sfc_txq_info *txq_info;
+ struct sfc_txq *txq;
+ unsigned int retry_count;
+ unsigned int wait_count;
+
+ sfc_log_init(sa, "TxQ = %u", sw_index);
+
+ SFC_ASSERT(sw_index < sa->txq_count);
+ txq_info = &sa->txq_info[sw_index];
+
+ txq = txq_info->txq;
+
+ if (txq->state == SFC_TXQ_INITIALIZED)
+ return;
+
+ SFC_ASSERT(txq->state & SFC_TXQ_STARTED);
+
+ sa->dp_tx->qstop(txq->dp, &txq->evq->read_ptr);
+
+ /*
+ * Retry TX queue flushing in case of flush failed or
+ * timeout; in the worst case it can delay for 6 seconds
+ */
+ for (retry_count = 0;
+ ((txq->state & SFC_TXQ_FLUSHED) == 0) &&
+ (retry_count < SFC_TX_QFLUSH_ATTEMPTS);
+ ++retry_count) {
+ if (efx_tx_qflush(txq->common) != 0) {
+ txq->state |= SFC_TXQ_FLUSHING;
+ break;
+ }
+
+ /*
+ * Wait for TX queue flush done or flush failed event at least
+ * SFC_TX_QFLUSH_POLL_WAIT_MS milliseconds and not more
+ * than 2 seconds (SFC_TX_QFLUSH_POLL_WAIT_MS multiplied
+ * by SFC_TX_QFLUSH_POLL_ATTEMPTS)
+ */
+ wait_count = 0;
+ do {
+ rte_delay_ms(SFC_TX_QFLUSH_POLL_WAIT_MS);
+ sfc_ev_qpoll(txq->evq);
+ } while ((txq->state & SFC_TXQ_FLUSHING) &&
+ wait_count++ < SFC_TX_QFLUSH_POLL_ATTEMPTS);
+
+ if (txq->state & SFC_TXQ_FLUSHING)
+ sfc_err(sa, "TxQ %u flush timed out", sw_index);
+
+ if (txq->state & SFC_TXQ_FLUSHED)
+ sfc_info(sa, "TxQ %u flushed", sw_index);
+ }
+
+ sa->dp_tx->qreap(txq->dp);
+
+ txq->state = SFC_TXQ_INITIALIZED;
+
+ efx_tx_qdestroy(txq->common);
+
+ sfc_ev_qstop(txq->evq);
+
+ /*
+ * It seems to be used by DPDK for debug purposes only ('rte_ether')
+ */
+ dev_data = sa->eth_dev->data;
+ dev_data->tx_queue_state[sw_index] = RTE_ETH_QUEUE_STATE_STOPPED;
+}
+
+int
+sfc_tx_start(struct sfc_adapter *sa)
+{
+ unsigned int sw_index;
+ int rc = 0;
+
+ sfc_log_init(sa, "txq_count = %u", sa->txq_count);
+
+ if (sa->tso) {
+ if (!efx_nic_cfg_get(sa->nic)->enc_fw_assisted_tso_v2_enabled) {
+ sfc_warn(sa, "TSO support was unable to be restored");
+ sa->tso = B_FALSE;
+ }
+ }
+
+ rc = efx_tx_init(sa->nic);
+ if (rc != 0)
+ goto fail_efx_tx_init;
+
+ for (sw_index = 0; sw_index < sa->txq_count; ++sw_index) {
+ if (!(sa->txq_info[sw_index].deferred_start) ||
+ sa->txq_info[sw_index].deferred_started) {
+ rc = sfc_tx_qstart(sa, sw_index);
+ if (rc != 0)
+ goto fail_tx_qstart;
+ }
+ }
+
+ return 0;
+
+fail_tx_qstart:
+ while (sw_index-- > 0)
+ sfc_tx_qstop(sa, sw_index);
+
+ efx_tx_fini(sa->nic);
+
+fail_efx_tx_init:
+ sfc_log_init(sa, "failed (rc = %d)", rc);
+ return rc;
+}
+
+void
+sfc_tx_stop(struct sfc_adapter *sa)
+{
+ unsigned int sw_index;
+
+ sfc_log_init(sa, "txq_count = %u", sa->txq_count);
+
+ sw_index = sa->txq_count;
+ while (sw_index-- > 0) {
+ if (sa->txq_info[sw_index].txq != NULL)
+ sfc_tx_qstop(sa, sw_index);
+ }
+
+ efx_tx_fini(sa->nic);
+}
+
+static void
+sfc_efx_tx_reap(struct sfc_efx_txq *txq)
+{
+ unsigned int completed;
+
+ sfc_ev_qpoll(txq->evq);
+
+ for (completed = txq->completed;
+ completed != txq->pending; completed++) {
+ struct sfc_efx_tx_sw_desc *txd;
+
+ txd = &txq->sw_ring[completed & txq->ptr_mask];
+
+ if (txd->mbuf != NULL) {
+ rte_pktmbuf_free(txd->mbuf);
+ txd->mbuf = NULL;
+ }
+ }
+
+ txq->completed = completed;
+}
+
+/*
+ * The function is used to insert or update VLAN tag;
+ * the firmware has state of the firmware tag to insert per TxQ
+ * (controlled by option descriptors), hence, if the tag of the
+ * packet to be sent is different from one remembered by the firmware,
+ * the function will update it
+ */
+static unsigned int
+sfc_efx_tx_maybe_insert_tag(struct sfc_efx_txq *txq, struct rte_mbuf *m,
+ efx_desc_t **pend)
+{
+ uint16_t this_tag = ((m->ol_flags & PKT_TX_VLAN_PKT) ?
+ m->vlan_tci : 0);
+
+ if (this_tag == txq->hw_vlan_tci)
+ return 0;
+
+ /*
+ * The expression inside SFC_ASSERT() is not desired to be checked in
+ * a non-debug build because it might be too expensive on the data path
+ */
+ SFC_ASSERT(efx_nic_cfg_get(txq->evq->sa->nic)->enc_hw_tx_insert_vlan_enabled);
+
+ efx_tx_qdesc_vlantci_create(txq->common, rte_cpu_to_be_16(this_tag),
+ *pend);
+ (*pend)++;
+ txq->hw_vlan_tci = this_tag;
+
+ return 1;
+}
+
+static uint16_t
+sfc_efx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+ struct sfc_dp_txq *dp_txq = (struct sfc_dp_txq *)tx_queue;
+ struct sfc_efx_txq *txq = sfc_efx_txq_by_dp_txq(dp_txq);
+ unsigned int added = txq->added;
+ unsigned int pushed = added;
+ unsigned int pkts_sent = 0;
+ efx_desc_t *pend = &txq->pend_desc[0];
+ const unsigned int hard_max_fill = EFX_TXQ_LIMIT(txq->ptr_mask + 1);
+ const unsigned int soft_max_fill = hard_max_fill - txq->free_thresh;
+ unsigned int fill_level = added - txq->completed;
+ boolean_t reap_done;
+ int rc __rte_unused;
+ struct rte_mbuf **pktp;
+
+ if (unlikely((txq->flags & SFC_EFX_TXQ_FLAG_RUNNING) == 0))
+ goto done;
+
+ /*
+ * If insufficient space for a single packet is present,
+ * we should reap; otherwise, we shouldn't do that all the time
+ * to avoid latency increase
+ */
+ reap_done = (fill_level > soft_max_fill);
+
+ if (reap_done) {
+ sfc_efx_tx_reap(txq);
+ /*
+ * Recalculate fill level since 'txq->completed'
+ * might have changed on reap
+ */
+ fill_level = added - txq->completed;
+ }
+
+ for (pkts_sent = 0, pktp = &tx_pkts[0];
+ (pkts_sent < nb_pkts) && (fill_level <= soft_max_fill);
+ pkts_sent++, pktp++) {
+ struct rte_mbuf *m_seg = *pktp;
+ size_t pkt_len = m_seg->pkt_len;
+ unsigned int pkt_descs = 0;
+ size_t in_off = 0;
+
+ /*
+ * Here VLAN TCI is expected to be zero in case if no
+ * DEV_TX_VLAN_OFFLOAD capability is advertised;
+ * if the calling app ignores the absence of
+ * DEV_TX_VLAN_OFFLOAD and pushes VLAN TCI, then
+ * TX_ERROR will occur
+ */
+ pkt_descs += sfc_efx_tx_maybe_insert_tag(txq, m_seg, &pend);
+
+ if (m_seg->ol_flags & PKT_TX_TCP_SEG) {
+ /*
+ * We expect correct 'pkt->l[2, 3, 4]_len' values
+ * to be set correctly by the caller
+ */
+ if (sfc_efx_tso_do(txq, added, &m_seg, &in_off, &pend,
+ &pkt_descs, &pkt_len) != 0) {
+ /* We may have reached this place for
+ * one of the following reasons:
+ *
+ * 1) Packet header length is greater
+ * than SFC_TSOH_STD_LEN
+ * 2) TCP header starts at more then
+ * 208 bytes into the frame
+ *
+ * We will deceive RTE saying that we have sent
+ * the packet, but we will actually drop it.
+ * Hence, we should revert 'pend' to the
+ * previous state (in case we have added
+ * VLAN descriptor) and start processing
+ * another one packet. But the original
+ * mbuf shouldn't be orphaned
+ */
+ pend -= pkt_descs;
+
+ rte_pktmbuf_free(*pktp);
+
+ continue;
+ }
+
+ /*
+ * We've only added 2 FATSOv2 option descriptors
+ * and 1 descriptor for the linearized packet header.
+ * The outstanding work will be done in the same manner
+ * as for the usual non-TSO path
+ */
+ }
+
+ for (; m_seg != NULL; m_seg = m_seg->next) {
+ efsys_dma_addr_t next_frag;
+ size_t seg_len;
+
+ seg_len = m_seg->data_len;
+ next_frag = rte_mbuf_data_dma_addr(m_seg);
+
+ /*
+ * If we've started TSO transaction few steps earlier,
+ * we'll skip packet header using an offset in the
+ * current segment (which has been set to the
+ * first one containing payload)
+ */
+ seg_len -= in_off;
+ next_frag += in_off;
+ in_off = 0;
+
+ do {
+ efsys_dma_addr_t frag_addr = next_frag;
+ size_t frag_len;
+
+ /*
+ * It is assumed here that there is no
+ * limitation on address boundary
+ * crossing by DMA descriptor.
+ */
+ frag_len = MIN(seg_len, txq->dma_desc_size_max);
+ next_frag += frag_len;
+ seg_len -= frag_len;
+ pkt_len -= frag_len;
+
+ efx_tx_qdesc_dma_create(txq->common,
+ frag_addr, frag_len,
+ (pkt_len == 0),
+ pend++);
+
+ pkt_descs++;
+ } while (seg_len != 0);
+ }
+
+ added += pkt_descs;
+
+ fill_level += pkt_descs;
+ if (unlikely(fill_level > hard_max_fill)) {
+ /*
+ * Our estimation for maximum number of descriptors
+ * required to send a packet seems to be wrong.
+ * Try to reap (if we haven't yet).
+ */
+ if (!reap_done) {
+ sfc_efx_tx_reap(txq);
+ reap_done = B_TRUE;
+ fill_level = added - txq->completed;
+ if (fill_level > hard_max_fill) {
+ pend -= pkt_descs;
+ break;
+ }
+ } else {
+ pend -= pkt_descs;
+ break;
+ }
+ }
+
+ /* Assign mbuf to the last used desc */
+ txq->sw_ring[(added - 1) & txq->ptr_mask].mbuf = *pktp;
+ }
+
+ if (likely(pkts_sent > 0)) {
+ rc = efx_tx_qdesc_post(txq->common, txq->pend_desc,
+ pend - &txq->pend_desc[0],
+ txq->completed, &txq->added);
+ SFC_ASSERT(rc == 0);
+
+ if (likely(pushed != txq->added))
+ efx_tx_qpush(txq->common, txq->added, pushed);
+ }
+
+#if SFC_TX_XMIT_PKTS_REAP_AT_LEAST_ONCE
+ if (!reap_done)
+ sfc_efx_tx_reap(txq);
+#endif
+
+done:
+ return pkts_sent;
+}
+
+struct sfc_txq *
+sfc_txq_by_dp_txq(const struct sfc_dp_txq *dp_txq)
+{
+ const struct sfc_dp_queue *dpq = &dp_txq->dpq;
+ struct rte_eth_dev *eth_dev;
+ struct sfc_adapter *sa;
+ struct sfc_txq *txq;
+
+ SFC_ASSERT(rte_eth_dev_is_valid_port(dpq->port_id));
+ eth_dev = &rte_eth_devices[dpq->port_id];
+
+ sa = eth_dev->data->dev_private;
+
+ SFC_ASSERT(dpq->queue_id < sa->txq_count);
+ txq = sa->txq_info[dpq->queue_id].txq;
+
+ SFC_ASSERT(txq != NULL);
+ return txq;
+}
+
+static sfc_dp_tx_qcreate_t sfc_efx_tx_qcreate;
+static int
+sfc_efx_tx_qcreate(uint16_t port_id, uint16_t queue_id,
+ const struct rte_pci_addr *pci_addr,
+ int socket_id,
+ const struct sfc_dp_tx_qcreate_info *info,
+ struct sfc_dp_txq **dp_txqp)
+{
+ struct sfc_efx_txq *txq;
+ struct sfc_txq *ctrl_txq;
+ int rc;
+
+ rc = ENOMEM;
+ txq = rte_zmalloc_socket("sfc-efx-txq", sizeof(*txq),
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (txq == NULL)
+ goto fail_txq_alloc;
+
+ sfc_dp_queue_init(&txq->dp.dpq, port_id, queue_id, pci_addr);
+
+ rc = ENOMEM;
+ txq->pend_desc = rte_calloc_socket("sfc-efx-txq-pend-desc",
+ EFX_TXQ_LIMIT(info->txq_entries),
+ sizeof(*txq->pend_desc), 0,
+ socket_id);
+ if (txq->pend_desc == NULL)
+ goto fail_pend_desc_alloc;
+
+ rc = ENOMEM;
+ txq->sw_ring = rte_calloc_socket("sfc-efx-txq-sw_ring",
+ info->txq_entries,
+ sizeof(*txq->sw_ring),
+ RTE_CACHE_LINE_SIZE, socket_id);
+ if (txq->sw_ring == NULL)
+ goto fail_sw_ring_alloc;
+
+ ctrl_txq = sfc_txq_by_dp_txq(&txq->dp);
+ if (ctrl_txq->evq->sa->tso) {
+ rc = sfc_efx_tso_alloc_tsoh_objs(txq->sw_ring,
+ info->txq_entries, socket_id);
+ if (rc != 0)
+ goto fail_alloc_tsoh_objs;
+ }
+
+ txq->evq = ctrl_txq->evq;
+ txq->ptr_mask = info->txq_entries - 1;
+ txq->free_thresh = info->free_thresh;
+ txq->dma_desc_size_max = info->dma_desc_size_max;
+
+ *dp_txqp = &txq->dp;
+ return 0;
+
+fail_alloc_tsoh_objs:
+ rte_free(txq->sw_ring);
+
+fail_sw_ring_alloc:
+ rte_free(txq->pend_desc);
+
+fail_pend_desc_alloc:
+ rte_free(txq);
+
+fail_txq_alloc:
+ return rc;
+}
+
+static sfc_dp_tx_qdestroy_t sfc_efx_tx_qdestroy;
+static void
+sfc_efx_tx_qdestroy(struct sfc_dp_txq *dp_txq)
+{
+ struct sfc_efx_txq *txq = sfc_efx_txq_by_dp_txq(dp_txq);
+
+ sfc_efx_tso_free_tsoh_objs(txq->sw_ring, txq->ptr_mask + 1);
+ rte_free(txq->sw_ring);
+ rte_free(txq->pend_desc);
+ rte_free(txq);
+}
+
+static sfc_dp_tx_qstart_t sfc_efx_tx_qstart;
+static int
+sfc_efx_tx_qstart(struct sfc_dp_txq *dp_txq,
+ __rte_unused unsigned int evq_read_ptr,
+ unsigned int txq_desc_index)
+{
+ /* libefx-based datapath is specific to libefx-based PMD */
+ struct sfc_efx_txq *txq = sfc_efx_txq_by_dp_txq(dp_txq);
+ struct sfc_txq *ctrl_txq = sfc_txq_by_dp_txq(dp_txq);
+
+ txq->common = ctrl_txq->common;
+
+ txq->pending = txq->completed = txq->added = txq_desc_index;
+ txq->hw_vlan_tci = 0;
+
+ txq->flags |= (SFC_EFX_TXQ_FLAG_STARTED | SFC_EFX_TXQ_FLAG_RUNNING);
+
+ return 0;
+}
+
+static sfc_dp_tx_qstop_t sfc_efx_tx_qstop;
+static void
+sfc_efx_tx_qstop(struct sfc_dp_txq *dp_txq,
+ __rte_unused unsigned int *evq_read_ptr)
+{
+ struct sfc_efx_txq *txq = sfc_efx_txq_by_dp_txq(dp_txq);
+
+ txq->flags &= ~SFC_EFX_TXQ_FLAG_RUNNING;
+}
+
+static sfc_dp_tx_qreap_t sfc_efx_tx_qreap;
+static void
+sfc_efx_tx_qreap(struct sfc_dp_txq *dp_txq)
+{
+ struct sfc_efx_txq *txq = sfc_efx_txq_by_dp_txq(dp_txq);
+ unsigned int txds;
+
+ sfc_efx_tx_reap(txq);
+
+ for (txds = 0; txds <= txq->ptr_mask; txds++) {
+ if (txq->sw_ring[txds].mbuf != NULL) {
+ rte_pktmbuf_free(txq->sw_ring[txds].mbuf);
+ txq->sw_ring[txds].mbuf = NULL;
+ }
+ }
+
+ txq->flags &= ~SFC_EFX_TXQ_FLAG_STARTED;
+}
+
+struct sfc_dp_tx sfc_efx_tx = {
+ .dp = {
+ .name = SFC_KVARG_DATAPATH_EFX,
+ .type = SFC_DP_TX,
+ .hw_fw_caps = 0,
+ },
+ .features = SFC_DP_TX_FEAT_VLAN_INSERT |
+ SFC_DP_TX_FEAT_TSO |
+ SFC_DP_TX_FEAT_MULTI_SEG,
+ .qcreate = sfc_efx_tx_qcreate,
+ .qdestroy = sfc_efx_tx_qdestroy,
+ .qstart = sfc_efx_tx_qstart,
+ .qstop = sfc_efx_tx_qstop,
+ .qreap = sfc_efx_tx_qreap,
+ .pkt_burst = sfc_efx_xmit_pkts,
+};
Code Review / deb_dpdk.git / blobdiff