IB/hfi1: VNIC SDMA support
HFI1 VNIC SDMA support enables transmission of VNIC packets over SDMA. Map VNIC queues to SDMA engines and support halting and wakeup of the VNIC queues. Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Vishwanathapura, Niranjana
Doug Ledford
parent
2280740f01
commit
64551ede6c
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@ -12,7 +12,7 @@ hfi1-y := affinity.o chip.o device.o driver.o efivar.o \
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init.o intr.o mad.o mmu_rb.o pcie.o pio.o pio_copy.o platform.o \
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qp.o qsfp.o rc.o ruc.o sdma.o sysfs.o trace.o \
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uc.o ud.o user_exp_rcv.o user_pages.o user_sdma.o verbs.o \
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verbs_txreq.o vnic_main.o
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verbs_txreq.o vnic_main.o vnic_sdma.o
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hfi1-$(CONFIG_DEBUG_FS) += debugfs.o
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CFLAGS_trace.o = -I$(src)
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@ -834,6 +834,7 @@ struct hfi1_asic_data {
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/* Virtual NIC information */
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struct hfi1_vnic_data {
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struct hfi1_ctxtdata *ctxt[HFI1_NUM_VNIC_CTXT];
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struct kmem_cache *txreq_cache;
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u8 num_vports;
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struct idr vesw_idr;
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u8 rmt_start;
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@ -681,6 +681,7 @@ int hfi1_init(struct hfi1_devdata *dd, int reinit)
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dd->process_pio_send = hfi1_verbs_send_pio;
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dd->process_dma_send = hfi1_verbs_send_dma;
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dd->pio_inline_send = pio_copy;
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dd->process_vnic_dma_send = hfi1_vnic_send_dma;
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if (is_ax(dd)) {
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atomic_set(&dd->drop_packet, DROP_PACKET_ON);
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@ -49,6 +49,7 @@
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#include <rdma/opa_vnic.h>
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#include "hfi.h"
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#include "sdma.h"
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#define HFI1_VNIC_MAX_TXQ 16
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#define HFI1_VNIC_MAX_PAD 12
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@ -84,6 +85,26 @@
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#define HFI1_VNIC_MAX_QUEUE 16
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/**
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* struct hfi1_vnic_sdma - VNIC per Tx ring SDMA information
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* @dd - device data pointer
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* @sde - sdma engine
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* @vinfo - vnic info pointer
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* @wait - iowait structure
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* @stx - sdma tx request
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* @state - vnic Tx ring SDMA state
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* @q_idx - vnic Tx queue index
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*/
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struct hfi1_vnic_sdma {
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struct hfi1_devdata *dd;
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struct sdma_engine *sde;
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struct hfi1_vnic_vport_info *vinfo;
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struct iowait wait;
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struct sdma_txreq stx;
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unsigned int state;
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u8 q_idx;
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};
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/**
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* struct hfi1_vnic_rx_queue - HFI1 VNIC receive queue
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* @idx: queue index
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@ -111,6 +132,7 @@ struct hfi1_vnic_rx_queue {
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* @vesw_id: virtual switch id
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* @rxq: Array of receive queues
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* @stats: per queue stats
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* @sdma: VNIC SDMA structure per TXQ
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*/
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struct hfi1_vnic_vport_info {
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struct hfi1_devdata *dd;
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@ -126,6 +148,7 @@ struct hfi1_vnic_vport_info {
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struct hfi1_vnic_rx_queue rxq[HFI1_NUM_VNIC_CTXT];
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struct opa_vnic_stats stats[HFI1_VNIC_MAX_QUEUE];
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struct hfi1_vnic_sdma sdma[HFI1_VNIC_MAX_TXQ];
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};
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#define v_dbg(format, arg...) \
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@ -138,8 +161,13 @@ struct hfi1_vnic_vport_info {
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/* vnic hfi1 internal functions */
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void hfi1_vnic_setup(struct hfi1_devdata *dd);
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void hfi1_vnic_cleanup(struct hfi1_devdata *dd);
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int hfi1_vnic_txreq_init(struct hfi1_devdata *dd);
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void hfi1_vnic_txreq_deinit(struct hfi1_devdata *dd);
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void hfi1_vnic_bypass_rcv(struct hfi1_packet *packet);
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void hfi1_vnic_sdma_init(struct hfi1_vnic_vport_info *vinfo);
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bool hfi1_vnic_sdma_write_avail(struct hfi1_vnic_vport_info *vinfo,
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u8 q_idx);
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/* vnic rdma netdev operations */
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struct net_device *hfi1_vnic_alloc_rn(struct ib_device *device,
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@ -406,6 +406,10 @@ static void hfi1_vnic_maybe_stop_tx(struct hfi1_vnic_vport_info *vinfo,
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u8 q_idx)
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{
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netif_stop_subqueue(vinfo->netdev, q_idx);
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if (!hfi1_vnic_sdma_write_avail(vinfo, q_idx))
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return;
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netif_start_subqueue(vinfo->netdev, q_idx);
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}
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static netdev_tx_t hfi1_netdev_start_xmit(struct sk_buff *skb,
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@ -477,7 +481,13 @@ static u16 hfi1_vnic_select_queue(struct net_device *netdev,
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void *accel_priv,
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select_queue_fallback_t fallback)
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{
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return 0;
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struct hfi1_vnic_vport_info *vinfo = opa_vnic_dev_priv(netdev);
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struct opa_vnic_skb_mdata *mdata;
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struct sdma_engine *sde;
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mdata = (struct opa_vnic_skb_mdata *)skb->data;
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sde = sdma_select_engine_vl(vinfo->dd, mdata->entropy, mdata->vl);
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return sde->this_idx;
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}
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/* hfi1_vnic_decap_skb - strip OPA header from the skb (ethernet) packet */
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@ -733,8 +743,13 @@ static int hfi1_vnic_init(struct hfi1_vnic_vport_info *vinfo)
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int i, rc = 0;
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mutex_lock(&hfi1_mutex);
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if (!dd->vnic.num_vports)
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if (!dd->vnic.num_vports) {
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rc = hfi1_vnic_txreq_init(dd);
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if (rc)
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goto txreq_fail;
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dd->vnic.msix_idx = dd->first_dyn_msix_idx;
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}
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for (i = dd->vnic.num_ctxt; i < vinfo->num_rx_q; i++) {
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rc = hfi1_vnic_allot_ctxt(dd, &dd->vnic.ctxt[i]);
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@ -762,7 +777,11 @@ static int hfi1_vnic_init(struct hfi1_vnic_vport_info *vinfo)
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}
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dd->vnic.num_vports++;
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hfi1_vnic_sdma_init(vinfo);
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alloc_fail:
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if (!dd->vnic.num_vports)
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hfi1_vnic_txreq_deinit(dd);
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txreq_fail:
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mutex_unlock(&hfi1_mutex);
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return rc;
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}
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@ -780,6 +799,7 @@ static void hfi1_vnic_deinit(struct hfi1_vnic_vport_info *vinfo)
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}
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hfi1_deinit_vnic_rsm(dd);
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dd->vnic.num_ctxt = 0;
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hfi1_vnic_txreq_deinit(dd);
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}
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mutex_unlock(&hfi1_mutex);
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}
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@ -0,0 +1,323 @@
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/*
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* Copyright(c) 2017 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* This file contains HFI1 support for VNIC SDMA functionality
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*/
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#include "sdma.h"
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#include "vnic.h"
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#define HFI1_VNIC_SDMA_Q_ACTIVE BIT(0)
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#define HFI1_VNIC_SDMA_Q_DEFERRED BIT(1)
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#define HFI1_VNIC_TXREQ_NAME_LEN 32
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#define HFI1_VNIC_SDMA_DESC_WTRMRK 64
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#define HFI1_VNIC_SDMA_RETRY_COUNT 1
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/*
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* struct vnic_txreq - VNIC transmit descriptor
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* @txreq: sdma transmit request
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* @sdma: vnic sdma pointer
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* @skb: skb to send
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* @pad: pad buffer
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* @plen: pad length
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* @pbc_val: pbc value
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* @retry_count: tx retry count
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*/
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struct vnic_txreq {
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struct sdma_txreq txreq;
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struct hfi1_vnic_sdma *sdma;
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struct sk_buff *skb;
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unsigned char pad[HFI1_VNIC_MAX_PAD];
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u16 plen;
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__le64 pbc_val;
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u32 retry_count;
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};
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static void vnic_sdma_complete(struct sdma_txreq *txreq,
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int status)
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{
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struct vnic_txreq *tx = container_of(txreq, struct vnic_txreq, txreq);
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struct hfi1_vnic_sdma *vnic_sdma = tx->sdma;
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sdma_txclean(vnic_sdma->dd, txreq);
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dev_kfree_skb_any(tx->skb);
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kmem_cache_free(vnic_sdma->dd->vnic.txreq_cache, tx);
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}
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static noinline int build_vnic_ulp_payload(struct sdma_engine *sde,
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struct vnic_txreq *tx)
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{
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int i, ret = 0;
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ret = sdma_txadd_kvaddr(
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sde->dd,
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&tx->txreq,
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tx->skb->data,
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skb_headlen(tx->skb));
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if (unlikely(ret))
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goto bail_txadd;
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for (i = 0; i < skb_shinfo(tx->skb)->nr_frags; i++) {
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struct skb_frag_struct *frag = &skb_shinfo(tx->skb)->frags[i];
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/* combine physically continuous fragments later? */
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ret = sdma_txadd_page(sde->dd,
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&tx->txreq,
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skb_frag_page(frag),
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frag->page_offset,
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skb_frag_size(frag));
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if (unlikely(ret))
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goto bail_txadd;
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}
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if (tx->plen)
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ret = sdma_txadd_kvaddr(sde->dd, &tx->txreq,
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tx->pad + HFI1_VNIC_MAX_PAD - tx->plen,
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tx->plen);
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bail_txadd:
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return ret;
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}
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static int build_vnic_tx_desc(struct sdma_engine *sde,
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struct vnic_txreq *tx,
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u64 pbc)
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{
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int ret = 0;
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u16 hdrbytes = 2 << 2; /* PBC */
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ret = sdma_txinit_ahg(
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&tx->txreq,
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0,
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hdrbytes + tx->skb->len + tx->plen,
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0,
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0,
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NULL,
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0,
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vnic_sdma_complete);
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if (unlikely(ret))
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goto bail_txadd;
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/* add pbc */
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tx->pbc_val = cpu_to_le64(pbc);
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ret = sdma_txadd_kvaddr(
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sde->dd,
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&tx->txreq,
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&tx->pbc_val,
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hdrbytes);
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if (unlikely(ret))
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goto bail_txadd;
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/* add the ulp payload */
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ret = build_vnic_ulp_payload(sde, tx);
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bail_txadd:
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return ret;
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}
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/* setup the last plen bypes of pad */
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static inline void hfi1_vnic_update_pad(unsigned char *pad, u8 plen)
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{
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pad[HFI1_VNIC_MAX_PAD - 1] = plen - OPA_VNIC_ICRC_TAIL_LEN;
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}
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int hfi1_vnic_send_dma(struct hfi1_devdata *dd, u8 q_idx,
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struct hfi1_vnic_vport_info *vinfo,
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struct sk_buff *skb, u64 pbc, u8 plen)
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{
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struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
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struct sdma_engine *sde = vnic_sdma->sde;
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struct vnic_txreq *tx;
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int ret = -ECOMM;
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if (unlikely(READ_ONCE(vnic_sdma->state) != HFI1_VNIC_SDMA_Q_ACTIVE))
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goto tx_err;
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if (unlikely(!sde || !sdma_running(sde)))
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goto tx_err;
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tx = kmem_cache_alloc(dd->vnic.txreq_cache, GFP_ATOMIC);
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if (unlikely(!tx)) {
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ret = -ENOMEM;
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goto tx_err;
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}
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tx->sdma = vnic_sdma;
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tx->skb = skb;
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hfi1_vnic_update_pad(tx->pad, plen);
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tx->plen = plen;
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ret = build_vnic_tx_desc(sde, tx, pbc);
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if (unlikely(ret))
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goto free_desc;
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tx->retry_count = 0;
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ret = sdma_send_txreq(sde, &vnic_sdma->wait, &tx->txreq);
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/* When -ECOMM, sdma callback will be called with ABORT status */
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if (unlikely(ret && unlikely(ret != -ECOMM)))
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goto free_desc;
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return ret;
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free_desc:
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sdma_txclean(dd, &tx->txreq);
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kmem_cache_free(dd->vnic.txreq_cache, tx);
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tx_err:
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if (ret != -EBUSY)
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dev_kfree_skb_any(skb);
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return ret;
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}
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/*
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* hfi1_vnic_sdma_sleep - vnic sdma sleep function
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*
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* This function gets called from sdma_send_txreq() when there are not enough
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* sdma descriptors available to send the packet. It adds Tx queue's wait
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* structure to sdma engine's dmawait list to be woken up when descriptors
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* become available.
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*/
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static int hfi1_vnic_sdma_sleep(struct sdma_engine *sde,
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struct iowait *wait,
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struct sdma_txreq *txreq,
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unsigned int seq)
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{
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struct hfi1_vnic_sdma *vnic_sdma =
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container_of(wait, struct hfi1_vnic_sdma, wait);
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struct hfi1_ibdev *dev = &vnic_sdma->dd->verbs_dev;
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struct vnic_txreq *tx = container_of(txreq, struct vnic_txreq, txreq);
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if (sdma_progress(sde, seq, txreq))
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if (tx->retry_count++ < HFI1_VNIC_SDMA_RETRY_COUNT)
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return -EAGAIN;
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vnic_sdma->state = HFI1_VNIC_SDMA_Q_DEFERRED;
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write_seqlock(&dev->iowait_lock);
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if (list_empty(&vnic_sdma->wait.list))
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list_add_tail(&vnic_sdma->wait.list, &sde->dmawait);
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write_sequnlock(&dev->iowait_lock);
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return -EBUSY;
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}
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/*
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* hfi1_vnic_sdma_wakeup - vnic sdma wakeup function
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*
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* This function gets called when SDMA descriptors becomes available and Tx
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* queue's wait structure was previously added to sdma engine's dmawait list.
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* It notifies the upper driver about Tx queue wakeup.
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*/
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static void hfi1_vnic_sdma_wakeup(struct iowait *wait, int reason)
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{
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struct hfi1_vnic_sdma *vnic_sdma =
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container_of(wait, struct hfi1_vnic_sdma, wait);
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struct hfi1_vnic_vport_info *vinfo = vnic_sdma->vinfo;
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|
||||
vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
|
||||
if (__netif_subqueue_stopped(vinfo->netdev, vnic_sdma->q_idx))
|
||||
netif_wake_subqueue(vinfo->netdev, vnic_sdma->q_idx);
|
||||
};
|
||||
|
||||
inline bool hfi1_vnic_sdma_write_avail(struct hfi1_vnic_vport_info *vinfo,
|
||||
u8 q_idx)
|
||||
{
|
||||
struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
|
||||
|
||||
return (READ_ONCE(vnic_sdma->state) == HFI1_VNIC_SDMA_Q_ACTIVE);
|
||||
}
|
||||
|
||||
void hfi1_vnic_sdma_init(struct hfi1_vnic_vport_info *vinfo)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < vinfo->num_tx_q; i++) {
|
||||
struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[i];
|
||||
|
||||
iowait_init(&vnic_sdma->wait, 0, NULL, hfi1_vnic_sdma_sleep,
|
||||
hfi1_vnic_sdma_wakeup, NULL);
|
||||
vnic_sdma->sde = &vinfo->dd->per_sdma[i];
|
||||
vnic_sdma->dd = vinfo->dd;
|
||||
vnic_sdma->vinfo = vinfo;
|
||||
vnic_sdma->q_idx = i;
|
||||
vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
|
||||
|
||||
/* Add a free descriptor watermark for wakeups */
|
||||
if (vnic_sdma->sde->descq_cnt > HFI1_VNIC_SDMA_DESC_WTRMRK) {
|
||||
INIT_LIST_HEAD(&vnic_sdma->stx.list);
|
||||
vnic_sdma->stx.num_desc = HFI1_VNIC_SDMA_DESC_WTRMRK;
|
||||
list_add_tail(&vnic_sdma->stx.list,
|
||||
&vnic_sdma->wait.tx_head);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void hfi1_vnic_txreq_kmem_cache_ctor(void *obj)
|
||||
{
|
||||
struct vnic_txreq *tx = (struct vnic_txreq *)obj;
|
||||
|
||||
memset(tx, 0, sizeof(*tx));
|
||||
}
|
||||
|
||||
int hfi1_vnic_txreq_init(struct hfi1_devdata *dd)
|
||||
{
|
||||
char buf[HFI1_VNIC_TXREQ_NAME_LEN];
|
||||
|
||||
snprintf(buf, sizeof(buf), "hfi1_%u_vnic_txreq_cache", dd->unit);
|
||||
dd->vnic.txreq_cache = kmem_cache_create(buf,
|
||||
sizeof(struct vnic_txreq),
|
||||
0, SLAB_HWCACHE_ALIGN,
|
||||
hfi1_vnic_txreq_kmem_cache_ctor);
|
||||
if (!dd->vnic.txreq_cache)
|
||||
return -ENOMEM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void hfi1_vnic_txreq_deinit(struct hfi1_devdata *dd)
|
||||
{
|
||||
kmem_cache_destroy(dd->vnic.txreq_cache);
|
||||
dd->vnic.txreq_cache = NULL;
|
||||
}
|
||||
Loading…
Reference in New Issue