X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=drivers%2Fnet%2Fsfc%2Fsfc_tx.c;h=a2406109d453702545078cf04dfb01ff32f14a8a;hb=c100fd464bb7;hp=9c4d6b730d86530e33bb1fde46d49aa392c7e1e8;hpb=dbf0f6278f6747d93475067b2860a6f691c319fe;p=dpdk.git

diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index 9c4d6b730d..a2406109d4 100644
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -28,9 +28,219 @@
  */
 
 #include "sfc.h"
+#include "sfc_debug.h"
 #include "sfc_log.h"
 #include "sfc_ev.h"
 #include "sfc_tx.h"
+#include "sfc_tweak.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,
+		   const struct rte_eth_txconf *tx_conf)
+{
+	unsigned int flags = tx_conf->txq_flags;
+	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 != 0) {
+		sfc_err(sa,
+			"setting explicit TX free threshold is not supported");
+		rc = EINVAL;
+	}
+
+	if (tx_conf->tx_deferred_start != 0) {
+		sfc_err(sa, "TX queue deferred start is not supported (yet)");
+		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_NOVLANOFFL) == 0) {
+		sfc_err(sa, "VLAN offload is not supported");
+		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;
+}
+
+static void
+sfc_tx_reap(struct sfc_txq *txq)
+{
+	unsigned int    completed;
+
+
+	sfc_ev_qpoll(txq->evq);
+
+	for (completed = txq->completed;
+	     completed != txq->pending; completed++) {
+		struct sfc_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;
+}
+
+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)
+{
+	struct sfc_txq_info *txq_info;
+	struct sfc_evq *evq;
+	struct sfc_txq *txq;
+	unsigned int evq_index = sfc_evq_index_by_txq_sw_index(sa, sw_index);
+	int rc = 0;
+
+	sfc_log_init(sa, "TxQ = %u", sw_index);
+
+	rc = sfc_tx_qcheck_conf(sa, 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, evq_index, txq_info->entries, socket_id);
+	if (rc != 0)
+		goto fail_ev_qinit;
+
+	evq = sa->evq_info[evq_index].evq;
+
+	rc = ENOMEM;
+	txq = rte_zmalloc_socket("sfc-txq", sizeof(*txq), 0, socket_id);
+	if (txq == NULL)
+		goto fail_txq_alloc;
+
+	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;
+
+	rc = ENOMEM;
+	txq->pend_desc = rte_calloc_socket("sfc-txq-pend-desc",
+					   EFX_TXQ_LIMIT(txq_info->entries),
+					   sizeof(efx_desc_t), 0, socket_id);
+	if (txq->pend_desc == NULL)
+		goto fail_pend_desc_alloc;
+
+	rc = ENOMEM;
+	txq->sw_ring = rte_calloc_socket("sfc-txq-desc", txq_info->entries,
+					 sizeof(*txq->sw_ring), 0, socket_id);
+	if (txq->sw_ring == NULL)
+		goto fail_desc_alloc;
+
+	txq->state = SFC_TXQ_INITIALIZED;
+	txq->ptr_mask = txq_info->entries - 1;
+	txq->hw_index = sw_index;
+	txq->flags = tx_conf->txq_flags;
+	txq->evq = evq;
+
+	evq->txq = txq;
+
+	txq_info->txq = txq;
+
+	return 0;
+
+fail_desc_alloc:
+	rte_free(txq->pend_desc);
+
+fail_pend_desc_alloc:
+	sfc_dma_free(sa, &txq->mem);
+
+fail_dma_alloc:
+	rte_free(txq);
+
+fail_txq_alloc:
+	sfc_ev_qfini(sa, evq_index);
+
+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);
+
+	txq_info->txq = NULL;
+	txq_info->entries = 0;
+
+	rte_free(txq->sw_ring);
+	rte_free(txq->pend_desc);
+	sfc_dma_free(sa, &txq->mem);
+	rte_free(txq);
+}
 
 static int
 sfc_tx_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
@@ -118,7 +328,316 @@ fail_check_mode:
 void
 sfc_tx_fini(struct sfc_adapter *sa)
 {
+	int sw_index;
+
+	sw_index = sa->txq_count;
+	while (--sw_index >= 0) {
+		if (sa->txq_info[sw_index].txq != NULL)
+			sfc_tx_qfini(sa, sw_index);
+	}
+
 	rte_free(sa->txq_info);
 	sa->txq_info = NULL;
 	sa->txq_count = 0;
 }
+
+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(sa, evq->evq_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;
+
+	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)
+		goto fail_tx_qcreate;
+
+	txq->added = txq->pending = txq->completed = desc_index;
+
+	efx_tx_qenable(txq->common);
+
+	txq->state |= (SFC_TXQ_STARTED | SFC_TXQ_RUNNING);
+
+	/*
+	 * 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_tx_qcreate:
+	sfc_ev_qstop(sa, evq->evq_index);
+
+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;
+	unsigned int txds;
+
+	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_STARTED);
+
+	txq->state &= ~SFC_TXQ_RUNNING;
+
+	/*
+	 * 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);
+	}
+
+	sfc_tx_reap(txq);
+
+	for (txds = 0; txds < txq_info->entries; txds++) {
+		if (txq->sw_ring[txds].mbuf != NULL) {
+			rte_pktmbuf_free(txq->sw_ring[txds].mbuf);
+			txq->sw_ring[txds].mbuf = NULL;
+		}
+	}
+
+	txq->state = SFC_TXQ_INITIALIZED;
+
+	efx_tx_qdestroy(txq->common);
+
+	sfc_ev_qstop(sa, txq->evq->evq_index);
+
+	/*
+	 * 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);
+
+	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) {
+		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);
+}
+
+uint16_t
+sfc_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+{
+	struct sfc_txq *txq = (struct sfc_txq *)tx_queue;
+	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 -
+					   SFC_TX_MAX_PKT_DESC;
+	unsigned int fill_level = added - txq->completed;
+	boolean_t reap_done;
+	int rc __rte_unused;
+	struct rte_mbuf **pktp;
+
+	if (unlikely((txq->state & SFC_TXQ_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_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;
+
+		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);
+
+			do {
+				efsys_dma_addr_t	frag_addr = next_frag;
+				size_t			frag_len;
+
+				next_frag = RTE_ALIGN(frag_addr + 1,
+						      SFC_TX_SEG_BOUNDARY);
+				frag_len = MIN(next_frag - frag_addr, seg_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_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_tx_reap(txq);
+#endif
+
+done:
+	return pkts_sent;
+}