1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/net/virtio/virtio_rxtx_simple.c b/drivers/net/virtio/virtio_rxtx_simple.c
new file mode 100644
index 00000000..8f5293dd
--- /dev/null
+++ b/drivers/net/virtio/virtio_rxtx_simple.c
@@ -0,0 +1,418 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ *   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 Intel 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 <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <tmmintrin.h>
+
+#include <rte_cycles.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_branch_prediction.h>
+#include <rte_mempool.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_prefetch.h>
+#include <rte_string_fns.h>
+#include <rte_errno.h>
+#include <rte_byteorder.h>
+
+#include "virtio_logs.h"
+#include "virtio_ethdev.h"
+#include "virtqueue.h"
+#include "virtio_rxtx.h"
+
+#define RTE_VIRTIO_VPMD_RX_BURST 32
+#define RTE_VIRTIO_DESC_PER_LOOP 8
+#define RTE_VIRTIO_VPMD_RX_REARM_THRESH RTE_VIRTIO_VPMD_RX_BURST
+
+#ifndef __INTEL_COMPILER
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+int __attribute__((cold))
+virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
+	struct rte_mbuf *cookie)
+{
+	struct vq_desc_extra *dxp;
+	struct vring_desc *start_dp;
+	uint16_t desc_idx;
+
+	desc_idx = vq->vq_avail_idx & (vq->vq_nentries - 1);
+	dxp = &vq->vq_descx[desc_idx];
+	dxp->cookie = (void *)cookie;
+	vq->sw_ring[desc_idx] = cookie;
+
+	start_dp = vq->vq_ring.desc;
+	start_dp[desc_idx].addr = (uint64_t)((uintptr_t)cookie->buf_physaddr +
+		RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size);
+	start_dp[desc_idx].len = cookie->buf_len -
+		RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size;
+
+	vq->vq_free_cnt--;
+	vq->vq_avail_idx++;
+
+	return 0;
+}
+
+static inline void
+virtio_rxq_rearm_vec(struct virtqueue *rxvq)
+{
+	int i;
+	uint16_t desc_idx;
+	struct rte_mbuf **sw_ring;
+	struct vring_desc *start_dp;
+	int ret;
+
+	desc_idx = rxvq->vq_avail_idx & (rxvq->vq_nentries - 1);
+	sw_ring = &rxvq->sw_ring[desc_idx];
+	start_dp = &rxvq->vq_ring.desc[desc_idx];
+
+	ret = rte_mempool_get_bulk(rxvq->mpool, (void **)sw_ring,
+		RTE_VIRTIO_VPMD_RX_REARM_THRESH);
+	if (unlikely(ret)) {
+		rte_eth_devices[rxvq->port_id].data->rx_mbuf_alloc_failed +=
+			RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+		return;
+	}
+
+	for (i = 0; i < RTE_VIRTIO_VPMD_RX_REARM_THRESH; i++) {
+		uintptr_t p;
+
+		p = (uintptr_t)&sw_ring[i]->rearm_data;
+		*(uint64_t *)p = rxvq->mbuf_initializer;
+
+		start_dp[i].addr =
+			(uint64_t)((uintptr_t)sw_ring[i]->buf_physaddr +
+			RTE_PKTMBUF_HEADROOM - rxvq->hw->vtnet_hdr_size);
+		start_dp[i].len = sw_ring[i]->buf_len -
+			RTE_PKTMBUF_HEADROOM + rxvq->hw->vtnet_hdr_size;
+	}
+
+	rxvq->vq_avail_idx += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+	rxvq->vq_free_cnt -= RTE_VIRTIO_VPMD_RX_REARM_THRESH;
+	vq_update_avail_idx(rxvq);
+}
+
+/* virtio vPMD receive routine, only accept(nb_pkts >= RTE_VIRTIO_DESC_PER_LOOP)
+ *
+ * This routine is for non-mergeable RX, one desc for each guest buffer.
+ * This routine is based on the RX ring layout optimization. Each entry in the
+ * avail ring points to the desc with the same index in the desc ring and this
+ * will never be changed in the driver.
+ *
+ * - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
+ */
+uint16_t
+virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+	uint16_t nb_pkts)
+{
+	struct virtqueue *rxvq = rx_queue;
+	uint16_t nb_used;
+	uint16_t desc_idx;
+	struct vring_used_elem *rused;
+	struct rte_mbuf **sw_ring;
+	struct rte_mbuf **sw_ring_end;
+	uint16_t nb_pkts_received;
+	__m128i shuf_msk1, shuf_msk2, len_adjust;
+
+	shuf_msk1 = _mm_set_epi8(
+		0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF,		/* vlan tci */
+		5, 4,			/* dat len */
+		0xFF, 0xFF, 5, 4,	/* pkt len */
+		0xFF, 0xFF, 0xFF, 0xFF	/* packet type */
+
+	);
+
+	shuf_msk2 = _mm_set_epi8(
+		0xFF, 0xFF, 0xFF, 0xFF,
+		0xFF, 0xFF,		/* vlan tci */
+		13, 12,			/* dat len */
+		0xFF, 0xFF, 13, 12,	/* pkt len */
+		0xFF, 0xFF, 0xFF, 0xFF	/* packet type */
+	);
+
+	/* Subtract the header length.
+	*  In which case do we need the header length in used->len ?
+	*/
+	len_adjust = _mm_set_epi16(
+		0, 0,
+		0,
+		(uint16_t)-rxvq->hw->vtnet_hdr_size,
+		0, (uint16_t)-rxvq->hw->vtnet_hdr_size,
+		0, 0);
+
+	if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))
+		return 0;
+
+	nb_used = *(volatile uint16_t *)&rxvq->vq_ring.used->idx -
+		rxvq->vq_used_cons_idx;
+
+	rte_compiler_barrier();
+
+	if (unlikely(nb_used == 0))
+		return 0;
+
+	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_VIRTIO_DESC_PER_LOOP);
+	nb_used = RTE_MIN(nb_used, nb_pkts);
+
+	desc_idx = (uint16_t)(rxvq->vq_used_cons_idx & (rxvq->vq_nentries - 1));
+	rused = &rxvq->vq_ring.used->ring[desc_idx];
+	sw_ring  = &rxvq->sw_ring[desc_idx];
+	sw_ring_end = &rxvq->sw_ring[rxvq->vq_nentries];
+
+	_mm_prefetch((const void *)rused, _MM_HINT_T0);
+
+	if (rxvq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
+		virtio_rxq_rearm_vec(rxvq);
+		if (unlikely(virtqueue_kick_prepare(rxvq)))
+			virtqueue_notify(rxvq);
+	}
+
+	for (nb_pkts_received = 0;
+		nb_pkts_received < nb_used;) {
+		__m128i desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
+		__m128i mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
+		__m128i pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
+
+		mbp[0] = _mm_loadu_si128((__m128i *)(sw_ring + 0));
+		desc[0] = _mm_loadu_si128((__m128i *)(rused + 0));
+		_mm_storeu_si128((__m128i *)&rx_pkts[0], mbp[0]);
+
+		mbp[1] = _mm_loadu_si128((__m128i *)(sw_ring + 2));
+		desc[1] = _mm_loadu_si128((__m128i *)(rused + 2));
+		_mm_storeu_si128((__m128i *)&rx_pkts[2], mbp[1]);
+
+		mbp[2] = _mm_loadu_si128((__m128i *)(sw_ring + 4));
+		desc[2] = _mm_loadu_si128((__m128i *)(rused + 4));
+		_mm_storeu_si128((__m128i *)&rx_pkts[4], mbp[2]);
+
+		mbp[3] = _mm_loadu_si128((__m128i *)(sw_ring + 6));
+		desc[3] = _mm_loadu_si128((__m128i *)(rused + 6));
+		_mm_storeu_si128((__m128i *)&rx_pkts[6], mbp[3]);
+
+		pkt_mb[1] = _mm_shuffle_epi8(desc[0], shuf_msk2);
+		pkt_mb[0] = _mm_shuffle_epi8(desc[0], shuf_msk1);
+		pkt_mb[1] = _mm_add_epi16(pkt_mb[1], len_adjust);
+		pkt_mb[0] = _mm_add_epi16(pkt_mb[0], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[1]->rx_descriptor_fields1,
+			pkt_mb[1]);
+		_mm_storeu_si128((void *)&rx_pkts[0]->rx_descriptor_fields1,
+			pkt_mb[0]);
+
+		pkt_mb[3] = _mm_shuffle_epi8(desc[1], shuf_msk2);
+		pkt_mb[2] = _mm_shuffle_epi8(desc[1], shuf_msk1);
+		pkt_mb[3] = _mm_add_epi16(pkt_mb[3], len_adjust);
+		pkt_mb[2] = _mm_add_epi16(pkt_mb[2], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[3]->rx_descriptor_fields1,
+			pkt_mb[3]);
+		_mm_storeu_si128((void *)&rx_pkts[2]->rx_descriptor_fields1,
+			pkt_mb[2]);
+
+		pkt_mb[5] = _mm_shuffle_epi8(desc[2], shuf_msk2);
+		pkt_mb[4] = _mm_shuffle_epi8(desc[2], shuf_msk1);
+		pkt_mb[5] = _mm_add_epi16(pkt_mb[5], len_adjust);
+		pkt_mb[4] = _mm_add_epi16(pkt_mb[4], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[5]->rx_descriptor_fields1,
+			pkt_mb[5]);
+		_mm_storeu_si128((void *)&rx_pkts[4]->rx_descriptor_fields1,
+			pkt_mb[4]);
+
+		pkt_mb[7] = _mm_shuffle_epi8(desc[3], shuf_msk2);
+		pkt_mb[6] = _mm_shuffle_epi8(desc[3], shuf_msk1);
+		pkt_mb[7] = _mm_add_epi16(pkt_mb[7], len_adjust);
+		pkt_mb[6] = _mm_add_epi16(pkt_mb[6], len_adjust);
+		_mm_storeu_si128((void *)&rx_pkts[7]->rx_descriptor_fields1,
+			pkt_mb[7]);
+		_mm_storeu_si128((void *)&rx_pkts[6]->rx_descriptor_fields1,
+			pkt_mb[6]);
+
+		if (unlikely(nb_used <= RTE_VIRTIO_DESC_PER_LOOP)) {
+			if (sw_ring + nb_used <= sw_ring_end)
+				nb_pkts_received += nb_used;
+			else
+				nb_pkts_received += sw_ring_end - sw_ring;
+			break;
+		} else {
+			if (unlikely(sw_ring + RTE_VIRTIO_DESC_PER_LOOP >=
+				sw_ring_end)) {
+				nb_pkts_received += sw_ring_end - sw_ring;
+				break;
+			} else {
+				nb_pkts_received += RTE_VIRTIO_DESC_PER_LOOP;
+
+				rx_pkts += RTE_VIRTIO_DESC_PER_LOOP;
+				sw_ring += RTE_VIRTIO_DESC_PER_LOOP;
+				rused   += RTE_VIRTIO_DESC_PER_LOOP;
+				nb_used -= RTE_VIRTIO_DESC_PER_LOOP;
+			}
+		}
+	}
+
+	rxvq->vq_used_cons_idx += nb_pkts_received;
+	rxvq->vq_free_cnt += nb_pkts_received;
+	rxvq->packets += nb_pkts_received;
+	return nb_pkts_received;
+}
+
+#define VIRTIO_TX_FREE_THRESH 32
+#define VIRTIO_TX_MAX_FREE_BUF_SZ 32
+#define VIRTIO_TX_FREE_NR 32
+/* TODO: vq->tx_free_cnt could mean num of free slots so we could avoid shift */
+static inline void
+virtio_xmit_cleanup(struct virtqueue *vq)
+{
+	uint16_t i, desc_idx;
+	int nb_free = 0;
+	struct rte_mbuf *m, *free[VIRTIO_TX_MAX_FREE_BUF_SZ];
+
+	desc_idx = (uint16_t)(vq->vq_used_cons_idx &
+		   ((vq->vq_nentries >> 1) - 1));
+	m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+	m = __rte_pktmbuf_prefree_seg(m);
+	if (likely(m != NULL)) {
+		free[0] = m;
+		nb_free = 1;
+		for (i = 1; i < VIRTIO_TX_FREE_NR; i++) {
+			m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+			m = __rte_pktmbuf_prefree_seg(m);
+			if (likely(m != NULL)) {
+				if (likely(m->pool == free[0]->pool))
+					free[nb_free++] = m;
+				else {
+					rte_mempool_put_bulk(free[0]->pool,
+						(void **)free, nb_free);
+					free[0] = m;
+					nb_free = 1;
+				}
+			}
+		}
+		rte_mempool_put_bulk(free[0]->pool, (void **)free, nb_free);
+	} else {
+		for (i = 1; i < VIRTIO_TX_FREE_NR; i++) {
+			m = (struct rte_mbuf *)vq->vq_descx[desc_idx++].cookie;
+			m = __rte_pktmbuf_prefree_seg(m);
+			if (m != NULL)
+				rte_mempool_put(m->pool, m);
+		}
+	}
+
+	vq->vq_used_cons_idx += VIRTIO_TX_FREE_NR;
+	vq->vq_free_cnt += (VIRTIO_TX_FREE_NR << 1);
+}
+
+uint16_t
+virtio_xmit_pkts_simple(void *tx_queue, struct rte_mbuf **tx_pkts,
+	uint16_t nb_pkts)
+{
+	struct virtqueue *txvq = tx_queue;
+	uint16_t nb_used;
+	uint16_t desc_idx;
+	struct vring_desc *start_dp;
+	uint16_t nb_tail, nb_commit;
+	int i;
+	uint16_t desc_idx_max = (txvq->vq_nentries >> 1) - 1;
+
+	nb_used = VIRTQUEUE_NUSED(txvq);
+	rte_compiler_barrier();
+
+	if (nb_used >= VIRTIO_TX_FREE_THRESH)
+		virtio_xmit_cleanup(tx_queue);
+
+	nb_commit = nb_pkts = RTE_MIN((txvq->vq_free_cnt >> 1), nb_pkts);
+	desc_idx = (uint16_t) (txvq->vq_avail_idx & desc_idx_max);
+	start_dp = txvq->vq_ring.desc;
+	nb_tail = (uint16_t) (desc_idx_max + 1 - desc_idx);
+
+	if (nb_commit >= nb_tail) {
+		for (i = 0; i < nb_tail; i++)
+			txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
+		for (i = 0; i < nb_tail; i++) {
+			start_dp[desc_idx].addr =
+				rte_mbuf_data_dma_addr(*tx_pkts);
+			start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
+			tx_pkts++;
+			desc_idx++;
+		}
+		nb_commit -= nb_tail;
+		desc_idx = 0;
+	}
+	for (i = 0; i < nb_commit; i++)
+		txvq->vq_descx[desc_idx + i].cookie = tx_pkts[i];
+	for (i = 0; i < nb_commit; i++) {
+		start_dp[desc_idx].addr = rte_mbuf_data_dma_addr(*tx_pkts);
+		start_dp[desc_idx].len = (*tx_pkts)->pkt_len;
+		tx_pkts++;
+		desc_idx++;
+	}
+
+	rte_compiler_barrier();
+
+	txvq->vq_free_cnt -= (uint16_t)(nb_pkts << 1);
+	txvq->vq_avail_idx += nb_pkts;
+	txvq->vq_ring.avail->idx = txvq->vq_avail_idx;
+	txvq->packets += nb_pkts;
+
+	if (likely(nb_pkts)) {
+		if (unlikely(virtqueue_kick_prepare(txvq)))
+			virtqueue_notify(txvq);
+	}
+
+	return nb_pkts;
+}
+
+int __attribute__((cold))
+virtio_rxq_vec_setup(struct virtqueue *rxq)
+{
+	uintptr_t p;
+	struct rte_mbuf mb_def = { .buf_addr = 0 }; /* zeroed mbuf */
+
+	mb_def.nb_segs = 1;
+	mb_def.data_off = RTE_PKTMBUF_HEADROOM;
+	mb_def.port = rxq->port_id;
+	rte_mbuf_refcnt_set(&mb_def, 1);
+
+	/* prevent compiler reordering: rearm_data covers previous fields */
+	rte_compiler_barrier();
+	p = (uintptr_t)&mb_def.rearm_data;
+	rxq->mbuf_initializer = *(uint64_t *)p;
+
+	return 0;
+}