OpenCloudOS-Kernel/drivers/infiniband/hw/hfi1/vnic_main.c

/*
 * Copyright(c) 2017 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * 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.
 *
 */

/*
 * This file contains HFI1 support for VNIC functionality
 */

#include <linux/io.h>
#include <linux/if_vlan.h>

#include "vnic.h"

#define HFI_TX_TIMEOUT_MS 1000

#define HFI1_VNIC_RCV_Q_SIZE   1024

#define HFI1_VNIC_UP 0

static DEFINE_SPINLOCK(vport_cntr_lock);

static int setup_vnic_ctxt(struct hfi1_devdata *dd, struct hfi1_ctxtdata *uctxt)
{
	unsigned int rcvctrl_ops = 0;
	int ret;

	hfi1_init_ctxt(uctxt->sc);

	uctxt->do_interrupt = &handle_receive_interrupt;

	/* Now allocate the RcvHdr queue and eager buffers. */
	ret = hfi1_create_rcvhdrq(dd, uctxt);
	if (ret)
		goto done;

	ret = hfi1_setup_eagerbufs(uctxt);
	if (ret)
		goto done;

	if (uctxt->rcvhdrtail_kvaddr)
		clear_rcvhdrtail(uctxt);

	rcvctrl_ops = HFI1_RCVCTRL_CTXT_ENB;
	rcvctrl_ops |= HFI1_RCVCTRL_INTRAVAIL_ENB;

	if (!HFI1_CAP_KGET_MASK(uctxt->flags, MULTI_PKT_EGR))
		rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
	if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_EGR_FULL))
		rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
	if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
		rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
	if (HFI1_CAP_KGET_MASK(uctxt->flags, DMA_RTAIL))
		rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;

	hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);

	uctxt->is_vnic = true;
done:
	return ret;
}

static int allocate_vnic_ctxt(struct hfi1_devdata *dd,
			      struct hfi1_ctxtdata **vnic_ctxt)
{
	struct hfi1_ctxtdata *uctxt;
	u16 ctxt;
	int ret;

	if (dd->flags & HFI1_FROZEN)
		return -EIO;

	for (ctxt = dd->first_dyn_alloc_ctxt;
	     ctxt < dd->num_rcv_contexts; ctxt++)
		if (!dd->rcd[ctxt])
			break;

	if (ctxt == dd->num_rcv_contexts)
		return -EBUSY;

	uctxt = hfi1_create_ctxtdata(dd->pport, ctxt, dd->node);
	if (!uctxt) {
		dd_dev_err(dd, "Unable to create ctxtdata, failing open\n");
		return -ENOMEM;
	}

	uctxt->flags = HFI1_CAP_KGET(MULTI_PKT_EGR) |
			HFI1_CAP_KGET(NODROP_RHQ_FULL) |
			HFI1_CAP_KGET(NODROP_EGR_FULL) |
			HFI1_CAP_KGET(DMA_RTAIL);
	uctxt->seq_cnt = 1;

	/* Allocate and enable a PIO send context */
	uctxt->sc = sc_alloc(dd, SC_VNIC, uctxt->rcvhdrqentsize,
			     uctxt->numa_id);

	ret = uctxt->sc ? 0 : -ENOMEM;
	if (ret)
		goto bail;

	dd_dev_dbg(dd, "allocated vnic send context %u(%u)\n",
		   uctxt->sc->sw_index, uctxt->sc->hw_context);
	ret = sc_enable(uctxt->sc);
	if (ret)
		goto bail;

	if (dd->num_msix_entries)
		hfi1_set_vnic_msix_info(uctxt);

	hfi1_stats.sps_ctxts++;
	dd_dev_dbg(dd, "created vnic context %d\n", uctxt->ctxt);
	*vnic_ctxt = uctxt;

	return ret;
bail:
	/*
	 * hfi1_rcd_put() will call hfi1_free_ctxtdata(), which will
	 * release send_context structure if uctxt->sc is not null
	 */
	dd->rcd[uctxt->ctxt] = NULL;
	hfi1_rcd_put(uctxt);
	dd_dev_dbg(dd, "vnic allocation failed. rc %d\n", ret);
	return ret;
}

static void deallocate_vnic_ctxt(struct hfi1_devdata *dd,
				 struct hfi1_ctxtdata *uctxt)
{
	unsigned long flags;

	dd_dev_dbg(dd, "closing vnic context %d\n", uctxt->ctxt);
	flush_wc();

	if (dd->num_msix_entries)
		hfi1_reset_vnic_msix_info(uctxt);

	spin_lock_irqsave(&dd->uctxt_lock, flags);
	/*
	 * Disable receive context and interrupt available, reset all
	 * RcvCtxtCtrl bits to default values.
	 */
	hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
		     HFI1_RCVCTRL_TIDFLOW_DIS |
		     HFI1_RCVCTRL_INTRAVAIL_DIS |
		     HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
		     HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
		     HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt);
	/*
	 * VNIC contexts are allocated from user context pool.
	 * Release them back to user context pool.
	 *
	 * Reset context integrity checks to default.
	 * (writes to CSRs probably belong in chip.c)
	 */
	write_kctxt_csr(dd, uctxt->sc->hw_context, SEND_CTXT_CHECK_ENABLE,
			hfi1_pkt_default_send_ctxt_mask(dd, SC_USER));
	sc_disable(uctxt->sc);

	dd->send_contexts[uctxt->sc->sw_index].type = SC_USER;
	spin_unlock_irqrestore(&dd->uctxt_lock, flags);

	dd->rcd[uctxt->ctxt] = NULL;
	uctxt->event_flags = 0;

	hfi1_clear_tids(uctxt);
	hfi1_clear_ctxt_pkey(dd, uctxt);

	hfi1_stats.sps_ctxts--;
	hfi1_rcd_put(uctxt);
}

void hfi1_vnic_setup(struct hfi1_devdata *dd)
{
	idr_init(&dd->vnic.vesw_idr);
}

void hfi1_vnic_cleanup(struct hfi1_devdata *dd)
{
	idr_destroy(&dd->vnic.vesw_idr);
}

#define SUM_GRP_COUNTERS(stats, qstats, x_grp) do {            \
		u64 *src64, *dst64;                            \
		for (src64 = &qstats->x_grp.unicast,           \
			dst64 = &stats->x_grp.unicast;         \
			dst64 <= &stats->x_grp.s_1519_max;) {  \
			*dst64++ += *src64++;                  \
		}                                              \
	} while (0)

/* hfi1_vnic_update_stats - update statistics */
static void hfi1_vnic_update_stats(struct hfi1_vnic_vport_info *vinfo,
				   struct opa_vnic_stats *stats)
{
	struct net_device *netdev = vinfo->netdev;
	u8 i;

	/* add tx counters on different queues */
	for (i = 0; i < vinfo->num_tx_q; i++) {
		struct opa_vnic_stats *qstats = &vinfo->stats[i];
		struct rtnl_link_stats64 *qnstats = &vinfo->stats[i].netstats;

		stats->netstats.tx_fifo_errors += qnstats->tx_fifo_errors;
		stats->netstats.tx_carrier_errors += qnstats->tx_carrier_errors;
		stats->tx_drop_state += qstats->tx_drop_state;
		stats->tx_dlid_zero += qstats->tx_dlid_zero;

		SUM_GRP_COUNTERS(stats, qstats, tx_grp);
		stats->netstats.tx_packets += qnstats->tx_packets;
		stats->netstats.tx_bytes += qnstats->tx_bytes;
	}

	/* add rx counters on different queues */
	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct opa_vnic_stats *qstats = &vinfo->stats[i];
		struct rtnl_link_stats64 *qnstats = &vinfo->stats[i].netstats;

		stats->netstats.rx_fifo_errors += qnstats->rx_fifo_errors;
		stats->netstats.rx_nohandler += qnstats->rx_nohandler;
		stats->rx_drop_state += qstats->rx_drop_state;
		stats->rx_oversize += qstats->rx_oversize;
		stats->rx_runt += qstats->rx_runt;

		SUM_GRP_COUNTERS(stats, qstats, rx_grp);
		stats->netstats.rx_packets += qnstats->rx_packets;
		stats->netstats.rx_bytes += qnstats->rx_bytes;
	}

	stats->netstats.tx_errors = stats->netstats.tx_fifo_errors +
				    stats->netstats.tx_carrier_errors +
				    stats->tx_drop_state + stats->tx_dlid_zero;
	stats->netstats.tx_dropped = stats->netstats.tx_errors;

	stats->netstats.rx_errors = stats->netstats.rx_fifo_errors +
				    stats->netstats.rx_nohandler +
				    stats->rx_drop_state + stats->rx_oversize +
				    stats->rx_runt;
	stats->netstats.rx_dropped = stats->netstats.rx_errors;

	netdev->stats.tx_packets = stats->netstats.tx_packets;
	netdev->stats.tx_bytes = stats->netstats.tx_bytes;
	netdev->stats.tx_fifo_errors = stats->netstats.tx_fifo_errors;
	netdev->stats.tx_carrier_errors = stats->netstats.tx_carrier_errors;
	netdev->stats.tx_errors = stats->netstats.tx_errors;
	netdev->stats.tx_dropped = stats->netstats.tx_dropped;

	netdev->stats.rx_packets = stats->netstats.rx_packets;
	netdev->stats.rx_bytes = stats->netstats.rx_bytes;
	netdev->stats.rx_fifo_errors = stats->netstats.rx_fifo_errors;
	netdev->stats.multicast = stats->rx_grp.mcastbcast;
	netdev->stats.rx_length_errors = stats->rx_oversize + stats->rx_runt;
	netdev->stats.rx_errors = stats->netstats.rx_errors;
	netdev->stats.rx_dropped = stats->netstats.rx_dropped;
}

/* update_len_counters - update pkt's len histogram counters */
static inline void update_len_counters(struct opa_vnic_grp_stats *grp,
				       int len)
{
	/* account for 4 byte FCS */
	if (len >= 1515)
		grp->s_1519_max++;
	else if (len >= 1020)
		grp->s_1024_1518++;
	else if (len >= 508)
		grp->s_512_1023++;
	else if (len >= 252)
		grp->s_256_511++;
	else if (len >= 124)
		grp->s_128_255++;
	else if (len >= 61)
		grp->s_65_127++;
	else
		grp->s_64++;
}

/* hfi1_vnic_update_tx_counters - update transmit counters */
static void hfi1_vnic_update_tx_counters(struct hfi1_vnic_vport_info *vinfo,
					 u8 q_idx, struct sk_buff *skb, int err)
{
	struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
	struct opa_vnic_stats *stats = &vinfo->stats[q_idx];
	struct opa_vnic_grp_stats *tx_grp = &stats->tx_grp;
	u16 vlan_tci;

	stats->netstats.tx_packets++;
	stats->netstats.tx_bytes += skb->len + ETH_FCS_LEN;

	update_len_counters(tx_grp, skb->len);

	/* rest of the counts are for good packets only */
	if (unlikely(err))
		return;

	if (is_multicast_ether_addr(mac_hdr->h_dest))
		tx_grp->mcastbcast++;
	else
		tx_grp->unicast++;

	if (!__vlan_get_tag(skb, &vlan_tci))
		tx_grp->vlan++;
	else
		tx_grp->untagged++;
}

/* hfi1_vnic_update_rx_counters - update receive counters */
static void hfi1_vnic_update_rx_counters(struct hfi1_vnic_vport_info *vinfo,
					 u8 q_idx, struct sk_buff *skb, int err)
{
	struct ethhdr *mac_hdr = (struct ethhdr *)skb->data;
	struct opa_vnic_stats *stats = &vinfo->stats[q_idx];
	struct opa_vnic_grp_stats *rx_grp = &stats->rx_grp;
	u16 vlan_tci;

	stats->netstats.rx_packets++;
	stats->netstats.rx_bytes += skb->len + ETH_FCS_LEN;

	update_len_counters(rx_grp, skb->len);

	/* rest of the counts are for good packets only */
	if (unlikely(err))
		return;

	if (is_multicast_ether_addr(mac_hdr->h_dest))
		rx_grp->mcastbcast++;
	else
		rx_grp->unicast++;

	if (!__vlan_get_tag(skb, &vlan_tci))
		rx_grp->vlan++;
	else
		rx_grp->untagged++;
}

/* This function is overloaded for opa_vnic specific implementation */
static void hfi1_vnic_get_stats64(struct net_device *netdev,
				  struct rtnl_link_stats64 *stats)
{
	struct opa_vnic_stats *vstats = (struct opa_vnic_stats *)stats;
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	hfi1_vnic_update_stats(vinfo, vstats);
}

static u64 create_bypass_pbc(u32 vl, u32 dw_len)
{
	u64 pbc;

	pbc = ((u64)PBC_IHCRC_NONE << PBC_INSERT_HCRC_SHIFT)
		| PBC_INSERT_BYPASS_ICRC | PBC_CREDIT_RETURN
		| PBC_PACKET_BYPASS
		| ((vl & PBC_VL_MASK) << PBC_VL_SHIFT)
		| (dw_len & PBC_LENGTH_DWS_MASK) << PBC_LENGTH_DWS_SHIFT;

	return pbc;
}

/* hfi1_vnic_maybe_stop_tx - stop tx queue if required */
static void hfi1_vnic_maybe_stop_tx(struct hfi1_vnic_vport_info *vinfo,
				    u8 q_idx)
{
	netif_stop_subqueue(vinfo->netdev, q_idx);
	if (!hfi1_vnic_sdma_write_avail(vinfo, q_idx))
		return;

	netif_start_subqueue(vinfo->netdev, q_idx);
}

static netdev_tx_t hfi1_netdev_start_xmit(struct sk_buff *skb,
					  struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	u8 pad_len, q_idx = skb->queue_mapping;
	struct hfi1_devdata *dd = vinfo->dd;
	struct opa_vnic_skb_mdata *mdata;
	u32 pkt_len, total_len;
	int err = -EINVAL;
	u64 pbc;

	v_dbg("xmit: queue %d skb len %d\n", q_idx, skb->len);
	if (unlikely(!netif_oper_up(netdev))) {
		vinfo->stats[q_idx].tx_drop_state++;
		goto tx_finish;
	}

	/* take out meta data */
	mdata = (struct opa_vnic_skb_mdata *)skb->data;
	skb_pull(skb, sizeof(*mdata));
	if (unlikely(mdata->flags & OPA_VNIC_SKB_MDATA_ENCAP_ERR)) {
		vinfo->stats[q_idx].tx_dlid_zero++;
		goto tx_finish;
	}

	/* add tail padding (for 8 bytes size alignment) and icrc */
	pad_len = -(skb->len + OPA_VNIC_ICRC_TAIL_LEN) & 0x7;
	pad_len += OPA_VNIC_ICRC_TAIL_LEN;

	/*
	 * pkt_len is how much data we have to write, includes header and data.
	 * total_len is length of the packet in Dwords plus the PBC should not
	 * include the CRC.
	 */
	pkt_len = (skb->len + pad_len) >> 2;
	total_len = pkt_len + 2; /* PBC + packet */

	pbc = create_bypass_pbc(mdata->vl, total_len);

	skb_get(skb);
	v_dbg("pbc 0x%016llX len %d pad_len %d\n", pbc, skb->len, pad_len);
	err = dd->process_vnic_dma_send(dd, q_idx, vinfo, skb, pbc, pad_len);
	if (unlikely(err)) {
		if (err == -ENOMEM)
			vinfo->stats[q_idx].netstats.tx_fifo_errors++;
		else if (err != -EBUSY)
			vinfo->stats[q_idx].netstats.tx_carrier_errors++;
	}
	/* remove the header before updating tx counters */
	skb_pull(skb, OPA_VNIC_HDR_LEN);

	if (unlikely(err == -EBUSY)) {
		hfi1_vnic_maybe_stop_tx(vinfo, q_idx);
		dev_kfree_skb_any(skb);
		return NETDEV_TX_BUSY;
	}

tx_finish:
	/* update tx counters */
	hfi1_vnic_update_tx_counters(vinfo, q_idx, skb, err);
	dev_kfree_skb_any(skb);
	return NETDEV_TX_OK;
}

static u16 hfi1_vnic_select_queue(struct net_device *netdev,
				  struct sk_buff *skb,
				  void *accel_priv,
				  select_queue_fallback_t fallback)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	struct opa_vnic_skb_mdata *mdata;
	struct sdma_engine *sde;

	mdata = (struct opa_vnic_skb_mdata *)skb->data;
	sde = sdma_select_engine_vl(vinfo->dd, mdata->entropy, mdata->vl);
	return sde->this_idx;
}

/* hfi1_vnic_decap_skb - strip OPA header from the skb (ethernet) packet */
static inline int hfi1_vnic_decap_skb(struct hfi1_vnic_rx_queue *rxq,
				      struct sk_buff *skb)
{
	struct hfi1_vnic_vport_info *vinfo = rxq->vinfo;
	int max_len = vinfo->netdev->mtu + VLAN_ETH_HLEN;
	int rc = -EFAULT;

	skb_pull(skb, OPA_VNIC_HDR_LEN);

	/* Validate Packet length */
	if (unlikely(skb->len > max_len))
		vinfo->stats[rxq->idx].rx_oversize++;
	else if (unlikely(skb->len < ETH_ZLEN))
		vinfo->stats[rxq->idx].rx_runt++;
	else
		rc = 0;
	return rc;
}

static inline struct sk_buff *hfi1_vnic_get_skb(struct hfi1_vnic_rx_queue *rxq)
{
	unsigned char *pad_info;
	struct sk_buff *skb;

	skb = skb_dequeue(&rxq->skbq);
	if (unlikely(!skb))
		return NULL;

	/* remove tail padding and icrc */
	pad_info = skb->data + skb->len - 1;
	skb_trim(skb, (skb->len - OPA_VNIC_ICRC_TAIL_LEN -
		       ((*pad_info) & 0x7)));

	return skb;
}

/* hfi1_vnic_handle_rx - handle skb receive */
static void hfi1_vnic_handle_rx(struct hfi1_vnic_rx_queue *rxq,
				int *work_done, int work_to_do)
{
	struct hfi1_vnic_vport_info *vinfo = rxq->vinfo;
	struct sk_buff *skb;
	int rc;

	while (1) {
		if (*work_done >= work_to_do)
			break;

		skb = hfi1_vnic_get_skb(rxq);
		if (unlikely(!skb))
			break;

		rc = hfi1_vnic_decap_skb(rxq, skb);
		/* update rx counters */
		hfi1_vnic_update_rx_counters(vinfo, rxq->idx, skb, rc);
		if (unlikely(rc)) {
			dev_kfree_skb_any(skb);
			continue;
		}

		skb_checksum_none_assert(skb);
		skb->protocol = eth_type_trans(skb, rxq->netdev);

		napi_gro_receive(&rxq->napi, skb);
		(*work_done)++;
	}
}

/* hfi1_vnic_napi - napi receive polling callback function */
static int hfi1_vnic_napi(struct napi_struct *napi, int budget)
{
	struct hfi1_vnic_rx_queue *rxq = container_of(napi,
					      struct hfi1_vnic_rx_queue, napi);
	struct hfi1_vnic_vport_info *vinfo = rxq->vinfo;
	int work_done = 0;

	v_dbg("napi %d budget %d\n", rxq->idx, budget);
	hfi1_vnic_handle_rx(rxq, &work_done, budget);

	v_dbg("napi %d work_done %d\n", rxq->idx, work_done);
	if (work_done < budget)
		napi_complete(napi);

	return work_done;
}

void hfi1_vnic_bypass_rcv(struct hfi1_packet *packet)
{
	struct hfi1_devdata *dd = packet->rcd->dd;
	struct hfi1_vnic_vport_info *vinfo = NULL;
	struct hfi1_vnic_rx_queue *rxq;
	struct sk_buff *skb;
	int l4_type, vesw_id = -1;
	u8 q_idx;

	l4_type = HFI1_GET_L4_TYPE(packet->ebuf);
	if (likely(l4_type == OPA_VNIC_L4_ETHR)) {
		vesw_id = HFI1_VNIC_GET_VESWID(packet->ebuf);
		vinfo = idr_find(&dd->vnic.vesw_idr, vesw_id);

		/*
		 * In case of invalid vesw id, count the error on
		 * the first available vport.
		 */
		if (unlikely(!vinfo)) {
			struct hfi1_vnic_vport_info *vinfo_tmp;
			int id_tmp = 0;

			vinfo_tmp =  idr_get_next(&dd->vnic.vesw_idr, &id_tmp);
			if (vinfo_tmp) {
				spin_lock(&vport_cntr_lock);
				vinfo_tmp->stats[0].netstats.rx_nohandler++;
				spin_unlock(&vport_cntr_lock);
			}
		}
	}

	if (unlikely(!vinfo)) {
		dd_dev_warn(dd, "vnic rcv err: l4 %d vesw id %d ctx %d\n",
			    l4_type, vesw_id, packet->rcd->ctxt);
		return;
	}

	q_idx = packet->rcd->vnic_q_idx;
	rxq = &vinfo->rxq[q_idx];
	if (unlikely(!netif_oper_up(vinfo->netdev))) {
		vinfo->stats[q_idx].rx_drop_state++;
		skb_queue_purge(&rxq->skbq);
		return;
	}

	if (unlikely(skb_queue_len(&rxq->skbq) > HFI1_VNIC_RCV_Q_SIZE)) {
		vinfo->stats[q_idx].netstats.rx_fifo_errors++;
		return;
	}

	skb = netdev_alloc_skb(vinfo->netdev, packet->tlen);
	if (unlikely(!skb)) {
		vinfo->stats[q_idx].netstats.rx_fifo_errors++;
		return;
	}

	memcpy(skb->data, packet->ebuf, packet->tlen);
	skb_put(skb, packet->tlen);
	skb_queue_tail(&rxq->skbq, skb);

	if (napi_schedule_prep(&rxq->napi)) {
		v_dbg("napi %d scheduling\n", q_idx);
		__napi_schedule(&rxq->napi);
	}
}

static int hfi1_vnic_up(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	struct net_device *netdev = vinfo->netdev;
	int i, rc;

	/* ensure virtual eth switch id is valid */
	if (!vinfo->vesw_id)
		return -EINVAL;

	rc = idr_alloc(&dd->vnic.vesw_idr, vinfo, vinfo->vesw_id,
		       vinfo->vesw_id + 1, GFP_NOWAIT);
	if (rc < 0)
		return rc;

	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct hfi1_vnic_rx_queue *rxq = &vinfo->rxq[i];

		skb_queue_head_init(&rxq->skbq);
		napi_enable(&rxq->napi);
	}

	netif_carrier_on(netdev);
	netif_tx_start_all_queues(netdev);
	set_bit(HFI1_VNIC_UP, &vinfo->flags);

	return 0;
}

static void hfi1_vnic_down(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	u8 i;

	clear_bit(HFI1_VNIC_UP, &vinfo->flags);
	netif_carrier_off(vinfo->netdev);
	netif_tx_disable(vinfo->netdev);
	idr_remove(&dd->vnic.vesw_idr, vinfo->vesw_id);

	/* ensure irqs see the change */
	hfi1_vnic_synchronize_irq(dd);

	/* remove unread skbs */
	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct hfi1_vnic_rx_queue *rxq = &vinfo->rxq[i];

		napi_disable(&rxq->napi);
		skb_queue_purge(&rxq->skbq);
	}
}

static int hfi1_netdev_open(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	int rc;

	mutex_lock(&vinfo->lock);
	rc = hfi1_vnic_up(vinfo);
	mutex_unlock(&vinfo->lock);
	return rc;
}

static int hfi1_netdev_close(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	mutex_lock(&vinfo->lock);
	if (test_bit(HFI1_VNIC_UP, &vinfo->flags))
		hfi1_vnic_down(vinfo);
	mutex_unlock(&vinfo->lock);
	return 0;
}

static int hfi1_vnic_allot_ctxt(struct hfi1_devdata *dd,
				struct hfi1_ctxtdata **vnic_ctxt)
{
	int rc;

	rc = allocate_vnic_ctxt(dd, vnic_ctxt);
	if (rc) {
		dd_dev_err(dd, "vnic ctxt alloc failed %d\n", rc);
		return rc;
	}

	rc = setup_vnic_ctxt(dd, *vnic_ctxt);
	if (rc) {
		dd_dev_err(dd, "vnic ctxt setup failed %d\n", rc);
		deallocate_vnic_ctxt(dd, *vnic_ctxt);
		*vnic_ctxt = NULL;
	}

	return rc;
}

static int hfi1_vnic_init(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	int i, rc = 0;

	mutex_lock(&hfi1_mutex);
	if (!dd->vnic.num_vports) {
		rc = hfi1_vnic_txreq_init(dd);
		if (rc)
			goto txreq_fail;

		dd->vnic.msix_idx = dd->first_dyn_msix_idx;
	}

	for (i = dd->vnic.num_ctxt; i < vinfo->num_rx_q; i++) {
		rc = hfi1_vnic_allot_ctxt(dd, &dd->vnic.ctxt[i]);
		if (rc)
			break;
		hfi1_rcd_get(dd->vnic.ctxt[i]);
		dd->vnic.ctxt[i]->vnic_q_idx = i;
	}

	if (i < vinfo->num_rx_q) {
		/*
		 * If required amount of contexts is not
		 * allocated successfully then remaining contexts
		 * are released.
		 */
		while (i-- > dd->vnic.num_ctxt) {
			deallocate_vnic_ctxt(dd, dd->vnic.ctxt[i]);
			hfi1_rcd_put(dd->vnic.ctxt[i]);
			dd->vnic.ctxt[i] = NULL;
		}
		goto alloc_fail;
	}

	if (dd->vnic.num_ctxt != i) {
		dd->vnic.num_ctxt = i;
		hfi1_init_vnic_rsm(dd);
	}

	dd->vnic.num_vports++;
	hfi1_vnic_sdma_init(vinfo);
alloc_fail:
	if (!dd->vnic.num_vports)
		hfi1_vnic_txreq_deinit(dd);
txreq_fail:
	mutex_unlock(&hfi1_mutex);
	return rc;
}

static void hfi1_vnic_deinit(struct hfi1_vnic_vport_info *vinfo)
{
	struct hfi1_devdata *dd = vinfo->dd;
	int i;

	mutex_lock(&hfi1_mutex);
	if (--dd->vnic.num_vports == 0) {
		for (i = 0; i < dd->vnic.num_ctxt; i++) {
			deallocate_vnic_ctxt(dd, dd->vnic.ctxt[i]);
			hfi1_rcd_put(dd->vnic.ctxt[i]);
			dd->vnic.ctxt[i] = NULL;
		}
		hfi1_deinit_vnic_rsm(dd);
		dd->vnic.num_ctxt = 0;
		hfi1_vnic_txreq_deinit(dd);
	}
	mutex_unlock(&hfi1_mutex);
}

static void hfi1_vnic_set_vesw_id(struct net_device *netdev, int id)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
	bool reopen = false;

	/*
	 * If vesw_id is being changed, and if the vnic port is up,
	 * reset the vnic port to ensure new vesw_id gets picked up
	 */
	if (id != vinfo->vesw_id) {
		mutex_lock(&vinfo->lock);
		if (test_bit(HFI1_VNIC_UP, &vinfo->flags)) {
			hfi1_vnic_down(vinfo);
			reopen = true;
		}

		vinfo->vesw_id = id;
		if (reopen)
			hfi1_vnic_up(vinfo);

		mutex_unlock(&vinfo->lock);
	}
}

/* netdev ops */
static const struct net_device_ops hfi1_netdev_ops = {
	.ndo_open = hfi1_netdev_open,
	.ndo_stop = hfi1_netdev_close,
	.ndo_start_xmit = hfi1_netdev_start_xmit,
	.ndo_select_queue = hfi1_vnic_select_queue,
	.ndo_get_stats64 = hfi1_vnic_get_stats64,
};

static void hfi1_vnic_free_rn(struct net_device *netdev)
{
	struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);

	hfi1_vnic_deinit(vinfo);
	mutex_destroy(&vinfo->lock);
	free_netdev(netdev);
}

struct net_device *hfi1_vnic_alloc_rn(struct ib_device *device,
				      u8 port_num,
				      enum rdma_netdev_t type,
				      const char *name,
				      unsigned char name_assign_type,
				      void (*setup)(struct net_device *))
{
	struct hfi1_devdata *dd = dd_from_ibdev(device);
	struct hfi1_vnic_vport_info *vinfo;
	struct net_device *netdev;
	struct rdma_netdev *rn;
	int i, size, rc;

	if (!port_num || (port_num > dd->num_pports))
		return ERR_PTR(-EINVAL);

	if (type != RDMA_NETDEV_OPA_VNIC)
		return ERR_PTR(-EOPNOTSUPP);

	size = sizeof(struct opa_vnic_rdma_netdev) + sizeof(*vinfo);
	netdev = alloc_netdev_mqs(size, name, name_assign_type, setup,
				  dd->chip_sdma_engines, HFI1_NUM_VNIC_CTXT);
	if (!netdev)
		return ERR_PTR(-ENOMEM);

	rn = netdev_priv(netdev);
	vinfo = opa_vnic_dev_priv(netdev);
	vinfo->dd = dd;
	vinfo->num_tx_q = dd->chip_sdma_engines;
	vinfo->num_rx_q = HFI1_NUM_VNIC_CTXT;
	vinfo->netdev = netdev;
	rn->free_rdma_netdev = hfi1_vnic_free_rn;
	rn->set_id = hfi1_vnic_set_vesw_id;

	netdev->features = NETIF_F_HIGHDMA | NETIF_F_SG;
	netdev->hw_features = netdev->features;
	netdev->vlan_features = netdev->features;
	netdev->watchdog_timeo = msecs_to_jiffies(HFI_TX_TIMEOUT_MS);
	netdev->netdev_ops = &hfi1_netdev_ops;
	mutex_init(&vinfo->lock);

	for (i = 0; i < vinfo->num_rx_q; i++) {
		struct hfi1_vnic_rx_queue *rxq = &vinfo->rxq[i];

		rxq->idx = i;
		rxq->vinfo = vinfo;
		rxq->netdev = netdev;
		netif_napi_add(netdev, &rxq->napi, hfi1_vnic_napi, 64);
	}

	rc = hfi1_vnic_init(vinfo);
	if (rc)
		goto init_fail;

	return netdev;
init_fail:
	mutex_destroy(&vinfo->lock);
	free_netdev(netdev);
	return ERR_PTR(rc);
}