diff options
Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_ib.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_ib.c | 1312 |
1 files changed, 1312 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c new file mode 100644 index 000000000..82b9c5b6e --- /dev/null +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -0,0 +1,1312 @@ +/* + * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. + * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. + * Copyright (c) 2005 Mellanox Technologies. All rights reserved. + * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * 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. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/delay.h> +#include <linux/moduleparam.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> + +#include <linux/ip.h> +#include <linux/tcp.h> +#include <rdma/ib_cache.h> + +#include "ipoib.h" + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA +static int data_debug_level; + +module_param(data_debug_level, int, 0644); +MODULE_PARM_DESC(data_debug_level, + "Enable data path debug tracing if > 0"); +#endif + +struct ipoib_ah *ipoib_create_ah(struct net_device *dev, + struct ib_pd *pd, struct rdma_ah_attr *attr) +{ + struct ipoib_ah *ah; + struct ib_ah *vah; + + ah = kmalloc(sizeof(*ah), GFP_KERNEL); + if (!ah) + return ERR_PTR(-ENOMEM); + + ah->dev = dev; + ah->last_send = 0; + kref_init(&ah->ref); + + vah = rdma_create_ah(pd, attr); + if (IS_ERR(vah)) { + kfree(ah); + ah = (struct ipoib_ah *)vah; + } else { + ah->ah = vah; + ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah); + } + + return ah; +} + +void ipoib_free_ah(struct kref *kref) +{ + struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); + struct ipoib_dev_priv *priv = ipoib_priv(ah->dev); + + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + list_add_tail(&ah->list, &priv->dead_ahs); + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, + u64 mapping[IPOIB_UD_RX_SG]) +{ + ib_dma_unmap_single(priv->ca, mapping[0], + IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), + DMA_FROM_DEVICE); +} + +static int ipoib_ib_post_receive(struct net_device *dev, int id) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int ret; + + priv->rx_wr.wr_id = id | IPOIB_OP_RECV; + priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; + priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; + + + ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL); + if (unlikely(ret)) { + ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); + ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); + dev_kfree_skb_any(priv->rx_ring[id].skb); + priv->rx_ring[id].skb = NULL; + } + + return ret; +} + +static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct sk_buff *skb; + int buf_size; + u64 *mapping; + + buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); + + skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN); + if (unlikely(!skb)) + return NULL; + + /* + * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is + * 64 bytes aligned + */ + skb_reserve(skb, sizeof(struct ipoib_pseudo_header)); + + mapping = priv->rx_ring[id].mapping; + mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, + DMA_FROM_DEVICE); + if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) + goto error; + + priv->rx_ring[id].skb = skb; + return skb; +error: + dev_kfree_skb_any(skb); + return NULL; +} + +static int ipoib_ib_post_receives(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int i; + + for (i = 0; i < ipoib_recvq_size; ++i) { + if (!ipoib_alloc_rx_skb(dev, i)) { + ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); + return -ENOMEM; + } + if (ipoib_ib_post_receive(dev, i)) { + ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); + return -EIO; + } + } + + return 0; +} + +static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; + struct sk_buff *skb; + u64 mapping[IPOIB_UD_RX_SG]; + union ib_gid *dgid; + union ib_gid *sgid; + + ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", + wr_id, wc->status); + + if (unlikely(wr_id >= ipoib_recvq_size)) { + ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", + wr_id, ipoib_recvq_size); + return; + } + + skb = priv->rx_ring[wr_id].skb; + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + if (wc->status != IB_WC_WR_FLUSH_ERR) + ipoib_warn(priv, + "failed recv event (status=%d, wrid=%d vend_err %#x)\n", + wc->status, wr_id, wc->vendor_err); + ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); + dev_kfree_skb_any(skb); + priv->rx_ring[wr_id].skb = NULL; + return; + } + + memcpy(mapping, priv->rx_ring[wr_id].mapping, + IPOIB_UD_RX_SG * sizeof(*mapping)); + + /* + * If we can't allocate a new RX buffer, dump + * this packet and reuse the old buffer. + */ + if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { + ++dev->stats.rx_dropped; + goto repost; + } + + ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", + wc->byte_len, wc->slid); + + ipoib_ud_dma_unmap_rx(priv, mapping); + + skb_put(skb, wc->byte_len); + + /* First byte of dgid signals multicast when 0xff */ + dgid = &((struct ib_grh *)skb->data)->dgid; + + if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) + skb->pkt_type = PACKET_HOST; + else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) + skb->pkt_type = PACKET_BROADCAST; + else + skb->pkt_type = PACKET_MULTICAST; + + sgid = &((struct ib_grh *)skb->data)->sgid; + + /* + * Drop packets that this interface sent, ie multicast packets + * that the HCA has replicated. + */ + if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) { + int need_repost = 1; + + if ((wc->wc_flags & IB_WC_GRH) && + sgid->global.interface_id != priv->local_gid.global.interface_id) + need_repost = 0; + + if (need_repost) { + dev_kfree_skb_any(skb); + goto repost; + } + } + + skb_pull(skb, IB_GRH_BYTES); + + skb->protocol = ((struct ipoib_header *) skb->data)->proto; + skb_add_pseudo_hdr(skb); + + ++dev->stats.rx_packets; + dev->stats.rx_bytes += skb->len; + if (skb->pkt_type == PACKET_MULTICAST) + dev->stats.multicast++; + + skb->dev = dev; + if ((dev->features & NETIF_F_RXCSUM) && + likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + napi_gro_receive(&priv->recv_napi, skb); + +repost: + if (unlikely(ipoib_ib_post_receive(dev, wr_id))) + ipoib_warn(priv, "ipoib_ib_post_receive failed " + "for buf %d\n", wr_id); +} + +int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req) +{ + struct sk_buff *skb = tx_req->skb; + u64 *mapping = tx_req->mapping; + int i; + int off; + + if (skb_headlen(skb)) { + mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), + DMA_TO_DEVICE); + if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) + return -EIO; + + off = 1; + } else + off = 0; + + for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + mapping[i + off] = ib_dma_map_page(ca, + skb_frag_page(frag), + frag->page_offset, skb_frag_size(frag), + DMA_TO_DEVICE); + if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) + goto partial_error; + } + return 0; + +partial_error: + for (; i > 0; --i) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; + + ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); + } + + if (off) + ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); + + return -EIO; +} + +void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv, + struct ipoib_tx_buf *tx_req) +{ + struct sk_buff *skb = tx_req->skb; + u64 *mapping = tx_req->mapping; + int i; + int off; + + if (skb_headlen(skb)) { + ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb), + DMA_TO_DEVICE); + off = 1; + } else + off = 0; + + for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + ib_dma_unmap_page(priv->ca, mapping[i + off], + skb_frag_size(frag), DMA_TO_DEVICE); + } +} + +/* + * As the result of a completion error the QP Can be transferred to SQE states. + * The function checks if the (send)QP is in SQE state and + * moves it back to RTS state, that in order to have it functional again. + */ +static void ipoib_qp_state_validate_work(struct work_struct *work) +{ + struct ipoib_qp_state_validate *qp_work = + container_of(work, struct ipoib_qp_state_validate, work); + + struct ipoib_dev_priv *priv = qp_work->priv; + struct ib_qp_attr qp_attr; + struct ib_qp_init_attr query_init_attr; + int ret; + + ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr); + if (ret) { + ipoib_warn(priv, "%s: Failed to query QP ret: %d\n", + __func__, ret); + goto free_res; + } + pr_info("%s: QP: 0x%x is in state: %d\n", + __func__, priv->qp->qp_num, qp_attr.qp_state); + + /* currently support only in SQE->RTS transition*/ + if (qp_attr.qp_state == IB_QPS_SQE) { + qp_attr.qp_state = IB_QPS_RTS; + + ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE); + if (ret) { + pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n", + ret, priv->qp->qp_num); + goto free_res; + } + pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n", + __func__, priv->qp->qp_num); + } else { + pr_warn("QP (%d) will stay in state: %d\n", + priv->qp->qp_num, qp_attr.qp_state); + } + +free_res: + kfree(qp_work); +} + +static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + unsigned int wr_id = wc->wr_id; + struct ipoib_tx_buf *tx_req; + + ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", + wr_id, wc->status); + + if (unlikely(wr_id >= ipoib_sendq_size)) { + ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", + wr_id, ipoib_sendq_size); + return; + } + + tx_req = &priv->tx_ring[wr_id]; + + ipoib_dma_unmap_tx(priv, tx_req); + + ++dev->stats.tx_packets; + dev->stats.tx_bytes += tx_req->skb->len; + + dev_kfree_skb_any(tx_req->skb); + + ++priv->tx_tail; + ++priv->global_tx_tail; + + if (unlikely(netif_queue_stopped(dev) && + ((priv->global_tx_head - priv->global_tx_tail) <= + ipoib_sendq_size >> 1) && + test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))) + netif_wake_queue(dev); + + if (wc->status != IB_WC_SUCCESS && + wc->status != IB_WC_WR_FLUSH_ERR) { + struct ipoib_qp_state_validate *qp_work; + ipoib_warn(priv, + "failed send event (status=%d, wrid=%d vend_err %#x)\n", + wc->status, wr_id, wc->vendor_err); + qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC); + if (!qp_work) + return; + + INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work); + qp_work->priv = priv; + queue_work(priv->wq, &qp_work->work); + } +} + +static int poll_tx(struct ipoib_dev_priv *priv) +{ + int n, i; + struct ib_wc *wc; + + n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); + for (i = 0; i < n; ++i) { + wc = priv->send_wc + i; + if (wc->wr_id & IPOIB_OP_CM) + ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i); + else + ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); + } + return n == MAX_SEND_CQE; +} + +int ipoib_rx_poll(struct napi_struct *napi, int budget) +{ + struct ipoib_dev_priv *priv = + container_of(napi, struct ipoib_dev_priv, recv_napi); + struct net_device *dev = priv->dev; + int done; + int t; + int n, i; + + done = 0; + +poll_more: + while (done < budget) { + int max = (budget - done); + + t = min(IPOIB_NUM_WC, max); + n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); + + for (i = 0; i < n; i++) { + struct ib_wc *wc = priv->ibwc + i; + + if (wc->wr_id & IPOIB_OP_RECV) { + ++done; + if (wc->wr_id & IPOIB_OP_CM) + ipoib_cm_handle_rx_wc(dev, wc); + else + ipoib_ib_handle_rx_wc(dev, wc); + } else { + pr_warn("%s: Got unexpected wqe id\n", __func__); + } + } + + if (n != t) + break; + } + + if (done < budget) { + napi_complete(napi); + if (unlikely(ib_req_notify_cq(priv->recv_cq, + IB_CQ_NEXT_COMP | + IB_CQ_REPORT_MISSED_EVENTS)) && + napi_reschedule(napi)) + goto poll_more; + } + + return done; +} + +int ipoib_tx_poll(struct napi_struct *napi, int budget) +{ + struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, + send_napi); + struct net_device *dev = priv->dev; + int n, i; + struct ib_wc *wc; + +poll_more: + n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); + + for (i = 0; i < n; i++) { + wc = priv->send_wc + i; + if (wc->wr_id & IPOIB_OP_CM) + ipoib_cm_handle_tx_wc(dev, wc); + else + ipoib_ib_handle_tx_wc(dev, wc); + } + + if (n < budget) { + napi_complete(napi); + if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP | + IB_CQ_REPORT_MISSED_EVENTS)) && + napi_reschedule(napi)) + goto poll_more; + } + return n < 0 ? 0 : n; +} + +void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr) +{ + struct ipoib_dev_priv *priv = ctx_ptr; + + napi_schedule(&priv->recv_napi); +} + +void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr) +{ + struct ipoib_dev_priv *priv = ctx_ptr; + + napi_schedule(&priv->send_napi); +} + +static inline int post_send(struct ipoib_dev_priv *priv, + unsigned int wr_id, + struct ib_ah *address, u32 dqpn, + struct ipoib_tx_buf *tx_req, + void *head, int hlen) +{ + struct sk_buff *skb = tx_req->skb; + + ipoib_build_sge(priv, tx_req); + + priv->tx_wr.wr.wr_id = wr_id; + priv->tx_wr.remote_qpn = dqpn; + priv->tx_wr.ah = address; + + if (head) { + priv->tx_wr.mss = skb_shinfo(skb)->gso_size; + priv->tx_wr.header = head; + priv->tx_wr.hlen = hlen; + priv->tx_wr.wr.opcode = IB_WR_LSO; + } else + priv->tx_wr.wr.opcode = IB_WR_SEND; + + return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL); +} + +int ipoib_send(struct net_device *dev, struct sk_buff *skb, + struct ib_ah *address, u32 dqpn) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_tx_buf *tx_req; + int hlen, rc; + void *phead; + unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb); + + if (skb_is_gso(skb)) { + hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); + phead = skb->data; + if (unlikely(!skb_pull(skb, hlen))) { + ipoib_warn(priv, "linear data too small\n"); + ++dev->stats.tx_dropped; + ++dev->stats.tx_errors; + dev_kfree_skb_any(skb); + return -1; + } + } else { + if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { + ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", + skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); + ++dev->stats.tx_dropped; + ++dev->stats.tx_errors; + ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); + return -1; + } + phead = NULL; + hlen = 0; + } + if (skb_shinfo(skb)->nr_frags > usable_sge) { + if (skb_linearize(skb) < 0) { + ipoib_warn(priv, "skb could not be linearized\n"); + ++dev->stats.tx_dropped; + ++dev->stats.tx_errors; + dev_kfree_skb_any(skb); + return -1; + } + /* Does skb_linearize return ok without reducing nr_frags? */ + if (skb_shinfo(skb)->nr_frags > usable_sge) { + ipoib_warn(priv, "too many frags after skb linearize\n"); + ++dev->stats.tx_dropped; + ++dev->stats.tx_errors; + dev_kfree_skb_any(skb); + return -1; + } + } + + ipoib_dbg_data(priv, + "sending packet, length=%d address=%p dqpn=0x%06x\n", + skb->len, address, dqpn); + + /* + * We put the skb into the tx_ring _before_ we call post_send() + * because it's entirely possible that the completion handler will + * run before we execute anything after the post_send(). That + * means we have to make sure everything is properly recorded and + * our state is consistent before we call post_send(). + */ + tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; + tx_req->skb = skb; + if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { + ++dev->stats.tx_errors; + dev_kfree_skb_any(skb); + return -1; + } + + if (skb->ip_summed == CHECKSUM_PARTIAL) + priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM; + else + priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; + /* increase the tx_head after send success, but use it for queue state */ + if ((priv->global_tx_head - priv->global_tx_tail) == + ipoib_sendq_size - 1) { + ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); + netif_stop_queue(dev); + } + + skb_orphan(skb); + skb_dst_drop(skb); + + if (netif_queue_stopped(dev)) + if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP | + IB_CQ_REPORT_MISSED_EVENTS) < 0) + ipoib_warn(priv, "request notify on send CQ failed\n"); + + rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), + address, dqpn, tx_req, phead, hlen); + if (unlikely(rc)) { + ipoib_warn(priv, "post_send failed, error %d\n", rc); + ++dev->stats.tx_errors; + ipoib_dma_unmap_tx(priv, tx_req); + dev_kfree_skb_any(skb); + if (netif_queue_stopped(dev)) + netif_wake_queue(dev); + rc = 0; + } else { + netif_trans_update(dev); + + rc = priv->tx_head; + ++priv->tx_head; + ++priv->global_tx_head; + } + return rc; +} + +static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv) +{ + struct ipoib_ah *ah, *tah; + LIST_HEAD(remove_list); + unsigned long flags; + + netif_tx_lock_bh(priv->dev); + spin_lock_irqsave(&priv->lock, flags); + + list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) + if ((int) priv->tx_tail - (int) ah->last_send >= 0) { + list_del(&ah->list); + rdma_destroy_ah(ah->ah); + kfree(ah); + } + + spin_unlock_irqrestore(&priv->lock, flags); + netif_tx_unlock_bh(priv->dev); +} + +void ipoib_reap_ah(struct work_struct *work) +{ + struct ipoib_dev_priv *priv = + container_of(work, struct ipoib_dev_priv, ah_reap_task.work); + + ipoib_reap_dead_ahs(priv); + + if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) + queue_delayed_work(priv->wq, &priv->ah_reap_task, + round_jiffies_relative(HZ)); +} + +static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv) +{ + clear_bit(IPOIB_STOP_REAPER, &priv->flags); + queue_delayed_work(priv->wq, &priv->ah_reap_task, + round_jiffies_relative(HZ)); +} + +static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv) +{ + set_bit(IPOIB_STOP_REAPER, &priv->flags); + cancel_delayed_work(&priv->ah_reap_task); + /* + * After ipoib_stop_ah_reaper() we always go through + * ipoib_reap_dead_ahs() which ensures the work is really stopped and + * does a final flush out of the dead_ah's list + */ +} + +static int recvs_pending(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int pending = 0; + int i; + + for (i = 0; i < ipoib_recvq_size; ++i) + if (priv->rx_ring[i].skb) + ++pending; + + return pending; +} + +static void check_qp_movement_and_print(struct ipoib_dev_priv *priv, + struct ib_qp *qp, + enum ib_qp_state new_state) +{ + struct ib_qp_attr qp_attr; + struct ib_qp_init_attr query_init_attr; + int ret; + + ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr); + if (ret) { + ipoib_warn(priv, "%s: Failed to query QP\n", __func__); + return; + } + /* print according to the new-state and the previous state.*/ + if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET) + ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n"); + else + ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n", + new_state, qp_attr.qp_state); +} + +static void ipoib_napi_enable(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + napi_enable(&priv->recv_napi); + napi_enable(&priv->send_napi); +} + +static void ipoib_napi_disable(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + napi_disable(&priv->recv_napi); + napi_disable(&priv->send_napi); +} + +int ipoib_ib_dev_stop_default(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ib_qp_attr qp_attr; + unsigned long begin; + struct ipoib_tx_buf *tx_req; + int i; + + if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) + ipoib_napi_disable(dev); + + ipoib_cm_dev_stop(dev); + + /* + * Move our QP to the error state and then reinitialize in + * when all work requests have completed or have been flushed. + */ + qp_attr.qp_state = IB_QPS_ERR; + if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) + check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR); + + /* Wait for all sends and receives to complete */ + begin = jiffies; + + while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { + if (time_after(jiffies, begin + 5 * HZ)) { + ipoib_warn(priv, + "timing out; %d sends %d receives not completed\n", + priv->tx_head - priv->tx_tail, + recvs_pending(dev)); + + /* + * assume the HW is wedged and just free up + * all our pending work requests. + */ + while ((int)priv->tx_tail - (int)priv->tx_head < 0) { + tx_req = &priv->tx_ring[priv->tx_tail & + (ipoib_sendq_size - 1)]; + ipoib_dma_unmap_tx(priv, tx_req); + dev_kfree_skb_any(tx_req->skb); + ++priv->tx_tail; + ++priv->global_tx_tail; + } + + for (i = 0; i < ipoib_recvq_size; ++i) { + struct ipoib_rx_buf *rx_req; + + rx_req = &priv->rx_ring[i]; + if (!rx_req->skb) + continue; + ipoib_ud_dma_unmap_rx(priv, + priv->rx_ring[i].mapping); + dev_kfree_skb_any(rx_req->skb); + rx_req->skb = NULL; + } + + goto timeout; + } + + ipoib_drain_cq(dev); + + usleep_range(1000, 2000); + } + + ipoib_dbg(priv, "All sends and receives done.\n"); + +timeout: + qp_attr.qp_state = IB_QPS_RESET; + if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) + ipoib_warn(priv, "Failed to modify QP to RESET state\n"); + + ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); + + return 0; +} + +int ipoib_ib_dev_open_default(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int ret; + + ret = ipoib_init_qp(dev); + if (ret) { + ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); + return -1; + } + + ret = ipoib_ib_post_receives(dev); + if (ret) { + ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); + goto out; + } + + ret = ipoib_cm_dev_open(dev); + if (ret) { + ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); + goto out; + } + + if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) + ipoib_napi_enable(dev); + + return 0; +out: + return -1; +} + +int ipoib_ib_dev_open(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_pkey_dev_check_presence(dev); + + if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { + ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, + (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); + return -1; + } + + ipoib_start_ah_reaper(priv); + if (priv->rn_ops->ndo_open(dev)) { + pr_warn("%s: Failed to open dev\n", dev->name); + goto dev_stop; + } + + set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); + + return 0; + +dev_stop: + ipoib_stop_ah_reaper(priv); + return -1; +} + +void ipoib_ib_dev_stop(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + priv->rn_ops->ndo_stop(dev); + + clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); + ipoib_stop_ah_reaper(priv); +} + +void ipoib_pkey_dev_check_presence(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rdma_netdev *rn = netdev_priv(dev); + + if (!(priv->pkey & 0x7fff) || + ib_find_pkey(priv->ca, priv->port, priv->pkey, + &priv->pkey_index)) { + clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); + } else { + if (rn->set_id) + rn->set_id(dev, priv->pkey_index); + set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); + } +} + +void ipoib_ib_dev_up(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_pkey_dev_check_presence(dev); + + if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { + ipoib_dbg(priv, "PKEY is not assigned.\n"); + return; + } + + set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); + + ipoib_mcast_start_thread(dev); +} + +void ipoib_ib_dev_down(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "downing ib_dev\n"); + + clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); + netif_carrier_off(dev); + + ipoib_mcast_stop_thread(dev); + ipoib_mcast_dev_flush(dev); + + ipoib_flush_paths(dev); +} + +void ipoib_drain_cq(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int i, n; + + /* + * We call completion handling routines that expect to be + * called from the BH-disabled NAPI poll context, so disable + * BHs here too. + */ + local_bh_disable(); + + do { + n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); + for (i = 0; i < n; ++i) { + /* + * Convert any successful completions to flush + * errors to avoid passing packets up the + * stack after bringing the device down. + */ + if (priv->ibwc[i].status == IB_WC_SUCCESS) + priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; + + if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { + if (priv->ibwc[i].wr_id & IPOIB_OP_CM) + ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); + else + ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); + } else { + pr_warn("%s: Got unexpected wqe id\n", __func__); + } + } + } while (n == IPOIB_NUM_WC); + + while (poll_tx(priv)) + ; /* nothing */ + + local_bh_enable(); +} + +/* + * Takes whatever value which is in pkey index 0 and updates priv->pkey + * returns 0 if the pkey value was changed. + */ +static inline int update_parent_pkey(struct ipoib_dev_priv *priv) +{ + int result; + u16 prev_pkey; + + prev_pkey = priv->pkey; + result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); + if (result) { + ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", + priv->port, result); + return result; + } + + priv->pkey |= 0x8000; + + if (prev_pkey != priv->pkey) { + ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", + prev_pkey, priv->pkey); + /* + * Update the pkey in the broadcast address, while making sure to set + * the full membership bit, so that we join the right broadcast group. + */ + priv->dev->broadcast[8] = priv->pkey >> 8; + priv->dev->broadcast[9] = priv->pkey & 0xff; + return 0; + } + + return 1; +} +/* + * returns 0 if pkey value was found in a different slot. + */ +static inline int update_child_pkey(struct ipoib_dev_priv *priv) +{ + u16 old_index = priv->pkey_index; + + priv->pkey_index = 0; + ipoib_pkey_dev_check_presence(priv->dev); + + if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && + (old_index == priv->pkey_index)) + return 1; + return 0; +} + +/* + * returns true if the device address of the ipoib interface has changed and the + * new address is a valid one (i.e in the gid table), return false otherwise. + */ +static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv) +{ + union ib_gid search_gid; + union ib_gid gid0; + union ib_gid *netdev_gid; + int err; + u16 index; + u8 port; + bool ret = false; + + netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4); + if (rdma_query_gid(priv->ca, priv->port, 0, &gid0)) + return false; + + netif_addr_lock_bh(priv->dev); + + /* The subnet prefix may have changed, update it now so we won't have + * to do it later + */ + priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix; + netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix; + search_gid.global.subnet_prefix = gid0.global.subnet_prefix; + + search_gid.global.interface_id = priv->local_gid.global.interface_id; + + netif_addr_unlock_bh(priv->dev); + + err = ib_find_gid(priv->ca, &search_gid, &port, &index); + + netif_addr_lock_bh(priv->dev); + + if (search_gid.global.interface_id != + priv->local_gid.global.interface_id) + /* There was a change while we were looking up the gid, bail + * here and let the next work sort this out + */ + goto out; + + /* The next section of code needs some background: + * Per IB spec the port GUID can't change if the HCA is powered on. + * port GUID is the basis for GID at index 0 which is the basis for + * the default device address of a ipoib interface. + * + * so it seems the flow should be: + * if user_changed_dev_addr && gid in gid tbl + * set bit dev_addr_set + * return true + * else + * return false + * + * The issue is that there are devices that don't follow the spec, + * they change the port GUID when the HCA is powered, so in order + * not to break userspace applications, We need to check if the + * user wanted to control the device address and we assume that + * if he sets the device address back to be based on GID index 0, + * he no longer wishs to control it. + * + * If the user doesn't control the the device address, + * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means + * the port GUID has changed and GID at index 0 has changed + * so we need to change priv->local_gid and priv->dev->dev_addr + * to reflect the new GID. + */ + if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) { + if (!err && port == priv->port) { + set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); + if (index == 0) + clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL, + &priv->flags); + else + set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags); + ret = true; + } else { + ret = false; + } + } else { + if (!err && port == priv->port) { + ret = true; + } else { + if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) { + memcpy(&priv->local_gid, &gid0, + sizeof(priv->local_gid)); + memcpy(priv->dev->dev_addr + 4, &gid0, + sizeof(priv->local_gid)); + ret = true; + } + } + } + +out: + netif_addr_unlock_bh(priv->dev); + + return ret; +} + +static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, + enum ipoib_flush_level level, + int nesting) +{ + struct ipoib_dev_priv *cpriv; + struct net_device *dev = priv->dev; + int result; + + down_read_nested(&priv->vlan_rwsem, nesting); + + /* + * Flush any child interfaces too -- they might be up even if + * the parent is down. + */ + list_for_each_entry(cpriv, &priv->child_intfs, list) + __ipoib_ib_dev_flush(cpriv, level, nesting + 1); + + up_read(&priv->vlan_rwsem); + + if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && + level != IPOIB_FLUSH_HEAVY) { + /* Make sure the dev_addr is set even if not flushing */ + if (level == IPOIB_FLUSH_LIGHT) + ipoib_dev_addr_changed_valid(priv); + ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); + return; + } + + if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { + /* interface is down. update pkey and leave. */ + if (level == IPOIB_FLUSH_HEAVY) { + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) + update_parent_pkey(priv); + else + update_child_pkey(priv); + } else if (level == IPOIB_FLUSH_LIGHT) + ipoib_dev_addr_changed_valid(priv); + ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); + return; + } + + if (level == IPOIB_FLUSH_HEAVY) { + /* child devices chase their origin pkey value, while non-child + * (parent) devices should always takes what present in pkey index 0 + */ + if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { + result = update_child_pkey(priv); + if (result) { + /* restart QP only if P_Key index is changed */ + ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); + return; + } + + } else { + result = update_parent_pkey(priv); + /* restart QP only if P_Key value changed */ + if (result) { + ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); + return; + } + } + } + + if (level == IPOIB_FLUSH_LIGHT) { + int oper_up; + ipoib_mark_paths_invalid(dev); + /* Set IPoIB operation as down to prevent races between: + * the flush flow which leaves MCG and on the fly joins + * which can happen during that time. mcast restart task + * should deal with join requests we missed. + */ + oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); + ipoib_mcast_dev_flush(dev); + if (oper_up) + set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); + ipoib_reap_dead_ahs(priv); + } + + if (level >= IPOIB_FLUSH_NORMAL) + ipoib_ib_dev_down(dev); + + if (level == IPOIB_FLUSH_HEAVY) { + if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) + ipoib_ib_dev_stop(dev); + + if (ipoib_ib_dev_open(dev)) + return; + + if (netif_queue_stopped(dev)) + netif_start_queue(dev); + } + + /* + * The device could have been brought down between the start and when + * we get here, don't bring it back up if it's not configured up + */ + if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { + if (level >= IPOIB_FLUSH_NORMAL) + ipoib_ib_dev_up(dev); + if (ipoib_dev_addr_changed_valid(priv)) + ipoib_mcast_restart_task(&priv->restart_task); + } +} + +void ipoib_ib_dev_flush_light(struct work_struct *work) +{ + struct ipoib_dev_priv *priv = + container_of(work, struct ipoib_dev_priv, flush_light); + + __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0); +} + +void ipoib_ib_dev_flush_normal(struct work_struct *work) +{ + struct ipoib_dev_priv *priv = + container_of(work, struct ipoib_dev_priv, flush_normal); + + __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0); +} + +void ipoib_ib_dev_flush_heavy(struct work_struct *work) +{ + struct ipoib_dev_priv *priv = + container_of(work, struct ipoib_dev_priv, flush_heavy); + + rtnl_lock(); + __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0); + rtnl_unlock(); +} + +void ipoib_ib_dev_cleanup(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "cleaning up ib_dev\n"); + /* + * We must make sure there are no more (path) completions + * that may wish to touch priv fields that are no longer valid + */ + ipoib_flush_paths(dev); + + ipoib_mcast_stop_thread(dev); + ipoib_mcast_dev_flush(dev); + + /* + * All of our ah references aren't free until after + * ipoib_mcast_dev_flush(), ipoib_flush_paths, and + * the neighbor garbage collection is stopped and reaped. + * That should all be done now, so make a final ah flush. + */ + ipoib_reap_dead_ahs(priv); + + clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); + + priv->rn_ops->ndo_uninit(dev); + + if (priv->pd) { + ib_dealloc_pd(priv->pd); + priv->pd = NULL; + } +} + |