forked from Minki/linux
49b8e74438
In several places, this snippet is used when removing neigh entries: list_del(&neigh->list); ipoib_neigh_free(neigh); The list_del() removes neigh from the associated struct ipoib_path, while ipoib_neigh_free() removes neigh from the device's neigh entry lookup table. Both of these operations are protected by the priv->lock spinlock. The table however is also protected via RCU, and so naturally the lock is not held when doing reads. This leads to a race condition, in which a thread may successfully look up a neigh entry that has already been deleted from neigh->list. Since the previous deletion will have marked the entry with poison, a second list_del() on the object will cause a panic: #5 [ffff8802338c3c70] general_protection at ffffffff815108c5 [exception RIP: list_del+16] RIP: ffffffff81289020 RSP: ffff8802338c3d20 RFLAGS: 00010082 RAX: dead000000200200 RBX: ffff880433e60c88 RCX: 0000000000009e6c RDX: 0000000000000246 RSI: ffff8806012ca298 RDI: ffff880433e60c88 RBP: ffff8802338c3d30 R8: ffff8806012ca2e8 R9: 00000000ffffffff R10: 0000000000000001 R11: 0000000000000000 R12: ffff8804346b2020 R13: ffff88032a3e7540 R14: ffff8804346b26e0 R15: 0000000000000246 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0000 #6 [ffff8802338c3d38] ipoib_cm_tx_handler at ffffffffa066fe0a [ib_ipoib] #7 [ffff8802338c3d98] cm_process_work at ffffffffa05149a7 [ib_cm] #8 [ffff8802338c3de8] cm_work_handler at ffffffffa05161aa [ib_cm] #9 [ffff8802338c3e38] worker_thread at ffffffff81090e10 #10 [ffff8802338c3ee8] kthread at ffffffff81096c66 #11 [ffff8802338c3f48] kernel_thread at ffffffff8100c0ca We move the list_del() into ipoib_neigh_free(), so that deletion happens only once, after the entry has been successfully removed from the lookup table. This same behavior is already used in ipoib_del_neighs_by_gid() and __ipoib_reap_neigh(). Signed-off-by: Jim Foraker <foraker1@llnl.gov> Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com> Reviewed-by: Jack Wang <jinpu.wang@profitbricks.com> Reviewed-by: Shlomo Pongratz <shlomop@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
1600 lines
42 KiB
C
1600 lines
42 KiB
C
/*
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* Copyright (c) 2006 Mellanox Technologies. All rights reserved
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <rdma/ib_cm.h>
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#include <net/dst.h>
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#include <net/icmp.h>
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#include <linux/icmpv6.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/moduleparam.h>
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#include "ipoib.h"
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int ipoib_max_conn_qp = 128;
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module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
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MODULE_PARM_DESC(max_nonsrq_conn_qp,
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"Max number of connected-mode QPs per interface "
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"(applied only if shared receive queue is not available)");
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#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
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static int data_debug_level;
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module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
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MODULE_PARM_DESC(cm_data_debug_level,
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"Enable data path debug tracing for connected mode if > 0");
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#endif
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#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
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#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
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#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
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#define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
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#define IPOIB_CM_RX_UPDATE_MASK (0x3)
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static struct ib_qp_attr ipoib_cm_err_attr = {
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.qp_state = IB_QPS_ERR
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};
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#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
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static struct ib_send_wr ipoib_cm_rx_drain_wr = {
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.wr_id = IPOIB_CM_RX_DRAIN_WRID,
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.opcode = IB_WR_SEND,
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};
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static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
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struct ib_cm_event *event);
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static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
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u64 mapping[IPOIB_CM_RX_SG])
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{
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int i;
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ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
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for (i = 0; i < frags; ++i)
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ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
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}
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static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ib_recv_wr *bad_wr;
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int i, ret;
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priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
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for (i = 0; i < priv->cm.num_frags; ++i)
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priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
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ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
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if (unlikely(ret)) {
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ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
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ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
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priv->cm.srq_ring[id].mapping);
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dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
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priv->cm.srq_ring[id].skb = NULL;
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}
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return ret;
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}
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static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
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struct ipoib_cm_rx *rx,
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struct ib_recv_wr *wr,
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struct ib_sge *sge, int id)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ib_recv_wr *bad_wr;
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int i, ret;
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wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
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for (i = 0; i < IPOIB_CM_RX_SG; ++i)
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sge[i].addr = rx->rx_ring[id].mapping[i];
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ret = ib_post_recv(rx->qp, wr, &bad_wr);
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if (unlikely(ret)) {
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ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
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ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
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rx->rx_ring[id].mapping);
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dev_kfree_skb_any(rx->rx_ring[id].skb);
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rx->rx_ring[id].skb = NULL;
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}
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return ret;
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}
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static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
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struct ipoib_cm_rx_buf *rx_ring,
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int id, int frags,
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u64 mapping[IPOIB_CM_RX_SG])
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct sk_buff *skb;
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int i;
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skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
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if (unlikely(!skb))
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return NULL;
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/*
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* IPoIB adds a 4 byte header. So we need 12 more bytes to align the
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* IP header to a multiple of 16.
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*/
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skb_reserve(skb, 12);
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mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
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DMA_FROM_DEVICE);
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if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
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dev_kfree_skb_any(skb);
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return NULL;
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}
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for (i = 0; i < frags; i++) {
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struct page *page = alloc_page(GFP_ATOMIC);
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if (!page)
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goto partial_error;
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skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
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mapping[i + 1] = ib_dma_map_page(priv->ca, page,
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0, PAGE_SIZE, DMA_FROM_DEVICE);
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if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
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goto partial_error;
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}
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rx_ring[id].skb = skb;
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return skb;
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partial_error:
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ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
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for (; i > 0; --i)
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ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
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dev_kfree_skb_any(skb);
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return NULL;
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}
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static void ipoib_cm_free_rx_ring(struct net_device *dev,
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struct ipoib_cm_rx_buf *rx_ring)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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int i;
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for (i = 0; i < ipoib_recvq_size; ++i)
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if (rx_ring[i].skb) {
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ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
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rx_ring[i].mapping);
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dev_kfree_skb_any(rx_ring[i].skb);
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}
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vfree(rx_ring);
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}
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static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
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{
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struct ib_send_wr *bad_wr;
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struct ipoib_cm_rx *p;
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/* We only reserved 1 extra slot in CQ for drain WRs, so
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* make sure we have at most 1 outstanding WR. */
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if (list_empty(&priv->cm.rx_flush_list) ||
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!list_empty(&priv->cm.rx_drain_list))
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return;
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/*
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* QPs on flush list are error state. This way, a "flush
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* error" WC will be immediately generated for each WR we post.
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*/
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p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
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if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
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ipoib_warn(priv, "failed to post drain wr\n");
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list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
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}
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static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
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{
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struct ipoib_cm_rx *p = ctx;
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struct ipoib_dev_priv *priv = netdev_priv(p->dev);
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unsigned long flags;
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if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
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return;
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spin_lock_irqsave(&priv->lock, flags);
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list_move(&p->list, &priv->cm.rx_flush_list);
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p->state = IPOIB_CM_RX_FLUSH;
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ipoib_cm_start_rx_drain(priv);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
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struct ipoib_cm_rx *p)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ib_qp_init_attr attr = {
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.event_handler = ipoib_cm_rx_event_handler,
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.send_cq = priv->recv_cq, /* For drain WR */
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.recv_cq = priv->recv_cq,
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.srq = priv->cm.srq,
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.cap.max_send_wr = 1, /* For drain WR */
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.cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
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.sq_sig_type = IB_SIGNAL_ALL_WR,
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.qp_type = IB_QPT_RC,
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.qp_context = p,
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};
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if (!ipoib_cm_has_srq(dev)) {
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attr.cap.max_recv_wr = ipoib_recvq_size;
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attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
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}
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return ib_create_qp(priv->pd, &attr);
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}
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static int ipoib_cm_modify_rx_qp(struct net_device *dev,
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struct ib_cm_id *cm_id, struct ib_qp *qp,
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unsigned psn)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ib_qp_attr qp_attr;
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int qp_attr_mask, ret;
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qp_attr.qp_state = IB_QPS_INIT;
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ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
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return ret;
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}
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ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
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return ret;
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}
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qp_attr.qp_state = IB_QPS_RTR;
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ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
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return ret;
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}
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qp_attr.rq_psn = psn;
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ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
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return ret;
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}
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/*
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* Current Mellanox HCA firmware won't generate completions
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* with error for drain WRs unless the QP has been moved to
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* RTS first. This work-around leaves a window where a QP has
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* moved to error asynchronously, but this will eventually get
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* fixed in firmware, so let's not error out if modify QP
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* fails.
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*/
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qp_attr.qp_state = IB_QPS_RTS;
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ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
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return 0;
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}
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ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
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if (ret) {
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ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
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return 0;
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}
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return 0;
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}
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static void ipoib_cm_init_rx_wr(struct net_device *dev,
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struct ib_recv_wr *wr,
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struct ib_sge *sge)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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int i;
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for (i = 0; i < priv->cm.num_frags; ++i)
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sge[i].lkey = priv->mr->lkey;
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sge[0].length = IPOIB_CM_HEAD_SIZE;
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for (i = 1; i < priv->cm.num_frags; ++i)
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sge[i].length = PAGE_SIZE;
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wr->next = NULL;
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wr->sg_list = sge;
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wr->num_sge = priv->cm.num_frags;
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}
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static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
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struct ipoib_cm_rx *rx)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct {
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struct ib_recv_wr wr;
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struct ib_sge sge[IPOIB_CM_RX_SG];
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} *t;
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int ret;
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int i;
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rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
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if (!rx->rx_ring) {
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printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
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priv->ca->name, ipoib_recvq_size);
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return -ENOMEM;
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}
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t = kmalloc(sizeof *t, GFP_KERNEL);
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if (!t) {
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ret = -ENOMEM;
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goto err_free;
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}
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ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
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spin_lock_irq(&priv->lock);
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if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
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spin_unlock_irq(&priv->lock);
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ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
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ret = -EINVAL;
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goto err_free;
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} else
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++priv->cm.nonsrq_conn_qp;
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spin_unlock_irq(&priv->lock);
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for (i = 0; i < ipoib_recvq_size; ++i) {
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if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
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rx->rx_ring[i].mapping)) {
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ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
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ret = -ENOMEM;
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goto err_count;
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}
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ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
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if (ret) {
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ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
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"failed for buf %d\n", i);
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ret = -EIO;
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goto err_count;
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}
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}
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rx->recv_count = ipoib_recvq_size;
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kfree(t);
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return 0;
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err_count:
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spin_lock_irq(&priv->lock);
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--priv->cm.nonsrq_conn_qp;
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spin_unlock_irq(&priv->lock);
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err_free:
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kfree(t);
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ipoib_cm_free_rx_ring(dev, rx->rx_ring);
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return ret;
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}
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static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
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struct ib_qp *qp, struct ib_cm_req_event_param *req,
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unsigned psn)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_data data = {};
|
|
struct ib_cm_rep_param rep = {};
|
|
|
|
data.qpn = cpu_to_be32(priv->qp->qp_num);
|
|
data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
|
|
|
|
rep.private_data = &data;
|
|
rep.private_data_len = sizeof data;
|
|
rep.flow_control = 0;
|
|
rep.rnr_retry_count = req->rnr_retry_count;
|
|
rep.srq = ipoib_cm_has_srq(dev);
|
|
rep.qp_num = qp->qp_num;
|
|
rep.starting_psn = psn;
|
|
return ib_send_cm_rep(cm_id, &rep);
|
|
}
|
|
|
|
static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
|
|
{
|
|
struct net_device *dev = cm_id->context;
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_rx *p;
|
|
unsigned psn;
|
|
int ret;
|
|
|
|
ipoib_dbg(priv, "REQ arrived\n");
|
|
p = kzalloc(sizeof *p, GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
p->dev = dev;
|
|
p->id = cm_id;
|
|
cm_id->context = p;
|
|
p->state = IPOIB_CM_RX_LIVE;
|
|
p->jiffies = jiffies;
|
|
INIT_LIST_HEAD(&p->list);
|
|
|
|
p->qp = ipoib_cm_create_rx_qp(dev, p);
|
|
if (IS_ERR(p->qp)) {
|
|
ret = PTR_ERR(p->qp);
|
|
goto err_qp;
|
|
}
|
|
|
|
psn = prandom_u32() & 0xffffff;
|
|
ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
|
|
if (ret)
|
|
goto err_modify;
|
|
|
|
if (!ipoib_cm_has_srq(dev)) {
|
|
ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
|
|
if (ret)
|
|
goto err_modify;
|
|
}
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
queue_delayed_work(ipoib_workqueue,
|
|
&priv->cm.stale_task, IPOIB_CM_RX_DELAY);
|
|
/* Add this entry to passive ids list head, but do not re-add it
|
|
* if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
|
|
p->jiffies = jiffies;
|
|
if (p->state == IPOIB_CM_RX_LIVE)
|
|
list_move(&p->list, &priv->cm.passive_ids);
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to send REP: %d\n", ret);
|
|
if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
|
|
ipoib_warn(priv, "unable to move qp to error state\n");
|
|
}
|
|
return 0;
|
|
|
|
err_modify:
|
|
ib_destroy_qp(p->qp);
|
|
err_qp:
|
|
kfree(p);
|
|
return ret;
|
|
}
|
|
|
|
static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
|
|
struct ib_cm_event *event)
|
|
{
|
|
struct ipoib_cm_rx *p;
|
|
struct ipoib_dev_priv *priv;
|
|
|
|
switch (event->event) {
|
|
case IB_CM_REQ_RECEIVED:
|
|
return ipoib_cm_req_handler(cm_id, event);
|
|
case IB_CM_DREQ_RECEIVED:
|
|
p = cm_id->context;
|
|
ib_send_cm_drep(cm_id, NULL, 0);
|
|
/* Fall through */
|
|
case IB_CM_REJ_RECEIVED:
|
|
p = cm_id->context;
|
|
priv = netdev_priv(p->dev);
|
|
if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
|
|
ipoib_warn(priv, "unable to move qp to error state\n");
|
|
/* Fall through */
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
/* Adjust length of skb with fragments to match received data */
|
|
static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
|
|
unsigned int length, struct sk_buff *toskb)
|
|
{
|
|
int i, num_frags;
|
|
unsigned int size;
|
|
|
|
/* put header into skb */
|
|
size = min(length, hdr_space);
|
|
skb->tail += size;
|
|
skb->len += size;
|
|
length -= size;
|
|
|
|
num_frags = skb_shinfo(skb)->nr_frags;
|
|
for (i = 0; i < num_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
|
|
if (length == 0) {
|
|
/* don't need this page */
|
|
skb_fill_page_desc(toskb, i, skb_frag_page(frag),
|
|
0, PAGE_SIZE);
|
|
--skb_shinfo(skb)->nr_frags;
|
|
} else {
|
|
size = min(length, (unsigned) PAGE_SIZE);
|
|
|
|
skb_frag_size_set(frag, size);
|
|
skb->data_len += size;
|
|
skb->truesize += size;
|
|
skb->len += size;
|
|
length -= size;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_rx_buf *rx_ring;
|
|
unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
|
|
struct sk_buff *skb, *newskb;
|
|
struct ipoib_cm_rx *p;
|
|
unsigned long flags;
|
|
u64 mapping[IPOIB_CM_RX_SG];
|
|
int frags;
|
|
int has_srq;
|
|
struct sk_buff *small_skb;
|
|
|
|
ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
|
|
wr_id, wc->status);
|
|
|
|
if (unlikely(wr_id >= ipoib_recvq_size)) {
|
|
if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
|
|
ipoib_cm_start_rx_drain(priv);
|
|
queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
} else
|
|
ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
|
|
wr_id, ipoib_recvq_size);
|
|
return;
|
|
}
|
|
|
|
p = wc->qp->qp_context;
|
|
|
|
has_srq = ipoib_cm_has_srq(dev);
|
|
rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
|
|
|
|
skb = rx_ring[wr_id].skb;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
ipoib_dbg(priv, "cm recv error "
|
|
"(status=%d, wrid=%d vend_err %x)\n",
|
|
wc->status, wr_id, wc->vendor_err);
|
|
++dev->stats.rx_dropped;
|
|
if (has_srq)
|
|
goto repost;
|
|
else {
|
|
if (!--p->recv_count) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_move(&p->list, &priv->cm.rx_reap_list);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
|
|
if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
p->jiffies = jiffies;
|
|
/* Move this entry to list head, but do not re-add it
|
|
* if it has been moved out of list. */
|
|
if (p->state == IPOIB_CM_RX_LIVE)
|
|
list_move(&p->list, &priv->cm.passive_ids);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
}
|
|
|
|
if (wc->byte_len < IPOIB_CM_COPYBREAK) {
|
|
int dlen = wc->byte_len;
|
|
|
|
small_skb = dev_alloc_skb(dlen + 12);
|
|
if (small_skb) {
|
|
skb_reserve(small_skb, 12);
|
|
ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
|
|
dlen, DMA_FROM_DEVICE);
|
|
skb_copy_from_linear_data(skb, small_skb->data, dlen);
|
|
ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
|
|
dlen, DMA_FROM_DEVICE);
|
|
skb_put(small_skb, dlen);
|
|
skb = small_skb;
|
|
goto copied;
|
|
}
|
|
}
|
|
|
|
frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
|
|
(unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
|
|
|
|
newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
|
|
if (unlikely(!newskb)) {
|
|
/*
|
|
* If we can't allocate a new RX buffer, dump
|
|
* this packet and reuse the old buffer.
|
|
*/
|
|
ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
|
|
++dev->stats.rx_dropped;
|
|
goto repost;
|
|
}
|
|
|
|
ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
|
|
memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
|
|
|
|
ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
|
|
wc->byte_len, wc->slid);
|
|
|
|
skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
|
|
|
|
copied:
|
|
skb->protocol = ((struct ipoib_header *) skb->data)->proto;
|
|
skb_reset_mac_header(skb);
|
|
skb_pull(skb, IPOIB_ENCAP_LEN);
|
|
|
|
++dev->stats.rx_packets;
|
|
dev->stats.rx_bytes += skb->len;
|
|
|
|
skb->dev = dev;
|
|
/* XXX get correct PACKET_ type here */
|
|
skb->pkt_type = PACKET_HOST;
|
|
netif_receive_skb(skb);
|
|
|
|
repost:
|
|
if (has_srq) {
|
|
if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
|
|
ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
|
|
"for buf %d\n", wr_id);
|
|
} else {
|
|
if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
|
|
&priv->cm.rx_wr,
|
|
priv->cm.rx_sge,
|
|
wr_id))) {
|
|
--p->recv_count;
|
|
ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
|
|
"for buf %d\n", wr_id);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline int post_send(struct ipoib_dev_priv *priv,
|
|
struct ipoib_cm_tx *tx,
|
|
unsigned int wr_id,
|
|
u64 addr, int len)
|
|
{
|
|
struct ib_send_wr *bad_wr;
|
|
|
|
priv->tx_sge[0].addr = addr;
|
|
priv->tx_sge[0].length = len;
|
|
|
|
priv->tx_wr.num_sge = 1;
|
|
priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
|
|
|
|
return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
|
|
}
|
|
|
|
void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_tx_buf *tx_req;
|
|
u64 addr;
|
|
int rc;
|
|
|
|
if (unlikely(skb->len > tx->mtu)) {
|
|
ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
|
|
skb->len, tx->mtu);
|
|
++dev->stats.tx_dropped;
|
|
++dev->stats.tx_errors;
|
|
ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
|
|
return;
|
|
}
|
|
|
|
ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
|
|
tx->tx_head, skb->len, tx->qp->qp_num);
|
|
|
|
/*
|
|
* 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 = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
|
|
tx_req->skb = skb;
|
|
addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
|
|
if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
|
|
++dev->stats.tx_errors;
|
|
dev_kfree_skb_any(skb);
|
|
return;
|
|
}
|
|
|
|
tx_req->mapping = addr;
|
|
|
|
skb_orphan(skb);
|
|
skb_dst_drop(skb);
|
|
|
|
rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
|
|
addr, skb->len);
|
|
if (unlikely(rc)) {
|
|
ipoib_warn(priv, "post_send failed, error %d\n", rc);
|
|
++dev->stats.tx_errors;
|
|
ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
|
|
dev_kfree_skb_any(skb);
|
|
} else {
|
|
dev->trans_start = jiffies;
|
|
++tx->tx_head;
|
|
|
|
if (++priv->tx_outstanding == ipoib_sendq_size) {
|
|
ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
|
|
tx->qp->qp_num);
|
|
netif_stop_queue(dev);
|
|
rc = ib_req_notify_cq(priv->send_cq,
|
|
IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
|
|
if (rc < 0)
|
|
ipoib_warn(priv, "request notify on send CQ failed\n");
|
|
else if (rc)
|
|
ipoib_send_comp_handler(priv->send_cq, dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_tx *tx = wc->qp->qp_context;
|
|
unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
|
|
struct ipoib_cm_tx_buf *tx_req;
|
|
unsigned long flags;
|
|
|
|
ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
|
|
wr_id, wc->status);
|
|
|
|
if (unlikely(wr_id >= ipoib_sendq_size)) {
|
|
ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
|
|
wr_id, ipoib_sendq_size);
|
|
return;
|
|
}
|
|
|
|
tx_req = &tx->tx_ring[wr_id];
|
|
|
|
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
|
|
|
|
/* FIXME: is this right? Shouldn't we only increment on success? */
|
|
++dev->stats.tx_packets;
|
|
dev->stats.tx_bytes += tx_req->skb->len;
|
|
|
|
dev_kfree_skb_any(tx_req->skb);
|
|
|
|
netif_tx_lock(dev);
|
|
|
|
++tx->tx_tail;
|
|
if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
|
|
netif_queue_stopped(dev) &&
|
|
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_neigh *neigh;
|
|
|
|
ipoib_dbg(priv, "failed cm send event "
|
|
"(status=%d, wrid=%d vend_err %x)\n",
|
|
wc->status, wr_id, wc->vendor_err);
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
neigh = tx->neigh;
|
|
|
|
if (neigh) {
|
|
neigh->cm = NULL;
|
|
ipoib_neigh_free(neigh);
|
|
|
|
tx->neigh = NULL;
|
|
}
|
|
|
|
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
|
|
list_move(&tx->list, &priv->cm.reap_list);
|
|
queue_work(ipoib_workqueue, &priv->cm.reap_task);
|
|
}
|
|
|
|
clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
|
|
netif_tx_unlock(dev);
|
|
}
|
|
|
|
int ipoib_cm_dev_open(struct net_device *dev)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
int ret;
|
|
|
|
if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
|
|
return 0;
|
|
|
|
priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
|
|
if (IS_ERR(priv->cm.id)) {
|
|
printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
|
|
ret = PTR_ERR(priv->cm.id);
|
|
goto err_cm;
|
|
}
|
|
|
|
ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
|
|
0, NULL);
|
|
if (ret) {
|
|
printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
|
|
IPOIB_CM_IETF_ID | priv->qp->qp_num);
|
|
goto err_listen;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_listen:
|
|
ib_destroy_cm_id(priv->cm.id);
|
|
err_cm:
|
|
priv->cm.id = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_rx *rx, *n;
|
|
LIST_HEAD(list);
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
list_splice_init(&priv->cm.rx_reap_list, &list);
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
list_for_each_entry_safe(rx, n, &list, list) {
|
|
ib_destroy_cm_id(rx->id);
|
|
ib_destroy_qp(rx->qp);
|
|
if (!ipoib_cm_has_srq(dev)) {
|
|
ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
|
|
spin_lock_irq(&priv->lock);
|
|
--priv->cm.nonsrq_conn_qp;
|
|
spin_unlock_irq(&priv->lock);
|
|
}
|
|
kfree(rx);
|
|
}
|
|
}
|
|
|
|
void ipoib_cm_dev_stop(struct net_device *dev)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_rx *p;
|
|
unsigned long begin;
|
|
int ret;
|
|
|
|
if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
|
|
return;
|
|
|
|
ib_destroy_cm_id(priv->cm.id);
|
|
priv->cm.id = NULL;
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
while (!list_empty(&priv->cm.passive_ids)) {
|
|
p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
|
|
list_move(&p->list, &priv->cm.rx_error_list);
|
|
p->state = IPOIB_CM_RX_ERROR;
|
|
spin_unlock_irq(&priv->lock);
|
|
ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
|
|
if (ret)
|
|
ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
|
|
spin_lock_irq(&priv->lock);
|
|
}
|
|
|
|
/* Wait for all RX to be drained */
|
|
begin = jiffies;
|
|
|
|
while (!list_empty(&priv->cm.rx_error_list) ||
|
|
!list_empty(&priv->cm.rx_flush_list) ||
|
|
!list_empty(&priv->cm.rx_drain_list)) {
|
|
if (time_after(jiffies, begin + 5 * HZ)) {
|
|
ipoib_warn(priv, "RX drain timing out\n");
|
|
|
|
/*
|
|
* assume the HW is wedged and just free up everything.
|
|
*/
|
|
list_splice_init(&priv->cm.rx_flush_list,
|
|
&priv->cm.rx_reap_list);
|
|
list_splice_init(&priv->cm.rx_error_list,
|
|
&priv->cm.rx_reap_list);
|
|
list_splice_init(&priv->cm.rx_drain_list,
|
|
&priv->cm.rx_reap_list);
|
|
break;
|
|
}
|
|
spin_unlock_irq(&priv->lock);
|
|
msleep(1);
|
|
ipoib_drain_cq(dev);
|
|
spin_lock_irq(&priv->lock);
|
|
}
|
|
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
ipoib_cm_free_rx_reap_list(dev);
|
|
|
|
cancel_delayed_work(&priv->cm.stale_task);
|
|
}
|
|
|
|
static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
|
|
{
|
|
struct ipoib_cm_tx *p = cm_id->context;
|
|
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
|
|
struct ipoib_cm_data *data = event->private_data;
|
|
struct sk_buff_head skqueue;
|
|
struct ib_qp_attr qp_attr;
|
|
int qp_attr_mask, ret;
|
|
struct sk_buff *skb;
|
|
|
|
p->mtu = be32_to_cpu(data->mtu);
|
|
|
|
if (p->mtu <= IPOIB_ENCAP_LEN) {
|
|
ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
|
|
p->mtu, IPOIB_ENCAP_LEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
qp_attr.qp_state = IB_QPS_RTR;
|
|
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
qp_attr.rq_psn = 0 /* FIXME */;
|
|
ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
qp_attr.qp_state = IB_QPS_RTS;
|
|
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
|
|
return ret;
|
|
}
|
|
ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
skb_queue_head_init(&skqueue);
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
|
|
if (p->neigh)
|
|
while ((skb = __skb_dequeue(&p->neigh->queue)))
|
|
__skb_queue_tail(&skqueue, skb);
|
|
spin_unlock_irq(&priv->lock);
|
|
|
|
while ((skb = __skb_dequeue(&skqueue))) {
|
|
skb->dev = p->dev;
|
|
if (dev_queue_xmit(skb))
|
|
ipoib_warn(priv, "dev_queue_xmit failed "
|
|
"to requeue packet\n");
|
|
}
|
|
|
|
ret = ib_send_cm_rtu(cm_id, NULL, 0);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to send RTU: %d\n", ret);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ib_qp_init_attr attr = {
|
|
.send_cq = priv->recv_cq,
|
|
.recv_cq = priv->recv_cq,
|
|
.srq = priv->cm.srq,
|
|
.cap.max_send_wr = ipoib_sendq_size,
|
|
.cap.max_send_sge = 1,
|
|
.sq_sig_type = IB_SIGNAL_ALL_WR,
|
|
.qp_type = IB_QPT_RC,
|
|
.qp_context = tx
|
|
};
|
|
|
|
return ib_create_qp(priv->pd, &attr);
|
|
}
|
|
|
|
static int ipoib_cm_send_req(struct net_device *dev,
|
|
struct ib_cm_id *id, struct ib_qp *qp,
|
|
u32 qpn,
|
|
struct ib_sa_path_rec *pathrec)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_data data = {};
|
|
struct ib_cm_req_param req = {};
|
|
|
|
data.qpn = cpu_to_be32(priv->qp->qp_num);
|
|
data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
|
|
|
|
req.primary_path = pathrec;
|
|
req.alternate_path = NULL;
|
|
req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
|
|
req.qp_num = qp->qp_num;
|
|
req.qp_type = qp->qp_type;
|
|
req.private_data = &data;
|
|
req.private_data_len = sizeof data;
|
|
req.flow_control = 0;
|
|
|
|
req.starting_psn = 0; /* FIXME */
|
|
|
|
/*
|
|
* Pick some arbitrary defaults here; we could make these
|
|
* module parameters if anyone cared about setting them.
|
|
*/
|
|
req.responder_resources = 4;
|
|
req.remote_cm_response_timeout = 20;
|
|
req.local_cm_response_timeout = 20;
|
|
req.retry_count = 0; /* RFC draft warns against retries */
|
|
req.rnr_retry_count = 0; /* RFC draft warns against retries */
|
|
req.max_cm_retries = 15;
|
|
req.srq = ipoib_cm_has_srq(dev);
|
|
return ib_send_cm_req(id, &req);
|
|
}
|
|
|
|
static int ipoib_cm_modify_tx_init(struct net_device *dev,
|
|
struct ib_cm_id *cm_id, struct ib_qp *qp)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ib_qp_attr qp_attr;
|
|
int qp_attr_mask, ret;
|
|
ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
|
|
if (ret) {
|
|
ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
|
|
return ret;
|
|
}
|
|
|
|
qp_attr.qp_state = IB_QPS_INIT;
|
|
qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
|
|
qp_attr.port_num = priv->port;
|
|
qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
|
|
|
|
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
|
|
struct ib_sa_path_rec *pathrec)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
|
|
int ret;
|
|
|
|
p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring);
|
|
if (!p->tx_ring) {
|
|
ipoib_warn(priv, "failed to allocate tx ring\n");
|
|
ret = -ENOMEM;
|
|
goto err_tx;
|
|
}
|
|
|
|
p->qp = ipoib_cm_create_tx_qp(p->dev, p);
|
|
if (IS_ERR(p->qp)) {
|
|
ret = PTR_ERR(p->qp);
|
|
ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
|
|
goto err_qp;
|
|
}
|
|
|
|
p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
|
|
if (IS_ERR(p->id)) {
|
|
ret = PTR_ERR(p->id);
|
|
ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
|
|
goto err_id;
|
|
}
|
|
|
|
ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
|
|
goto err_modify;
|
|
}
|
|
|
|
ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
|
|
if (ret) {
|
|
ipoib_warn(priv, "failed to send cm req: %d\n", ret);
|
|
goto err_send_cm;
|
|
}
|
|
|
|
ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
|
|
p->qp->qp_num, pathrec->dgid.raw, qpn);
|
|
|
|
return 0;
|
|
|
|
err_send_cm:
|
|
err_modify:
|
|
ib_destroy_cm_id(p->id);
|
|
err_id:
|
|
p->id = NULL;
|
|
ib_destroy_qp(p->qp);
|
|
err_qp:
|
|
p->qp = NULL;
|
|
vfree(p->tx_ring);
|
|
err_tx:
|
|
return ret;
|
|
}
|
|
|
|
static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
|
|
struct ipoib_cm_tx_buf *tx_req;
|
|
unsigned long begin;
|
|
|
|
ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
|
|
p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
|
|
|
|
if (p->id)
|
|
ib_destroy_cm_id(p->id);
|
|
|
|
if (p->tx_ring) {
|
|
/* Wait for all sends to complete */
|
|
begin = jiffies;
|
|
while ((int) p->tx_tail - (int) p->tx_head < 0) {
|
|
if (time_after(jiffies, begin + 5 * HZ)) {
|
|
ipoib_warn(priv, "timing out; %d sends not completed\n",
|
|
p->tx_head - p->tx_tail);
|
|
goto timeout;
|
|
}
|
|
|
|
msleep(1);
|
|
}
|
|
}
|
|
|
|
timeout:
|
|
|
|
while ((int) p->tx_tail - (int) p->tx_head < 0) {
|
|
tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
|
|
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
|
|
DMA_TO_DEVICE);
|
|
dev_kfree_skb_any(tx_req->skb);
|
|
++p->tx_tail;
|
|
netif_tx_lock_bh(p->dev);
|
|
if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
|
|
netif_queue_stopped(p->dev) &&
|
|
test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
|
|
netif_wake_queue(p->dev);
|
|
netif_tx_unlock_bh(p->dev);
|
|
}
|
|
|
|
if (p->qp)
|
|
ib_destroy_qp(p->qp);
|
|
|
|
vfree(p->tx_ring);
|
|
kfree(p);
|
|
}
|
|
|
|
static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
|
|
struct ib_cm_event *event)
|
|
{
|
|
struct ipoib_cm_tx *tx = cm_id->context;
|
|
struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
|
|
struct net_device *dev = priv->dev;
|
|
struct ipoib_neigh *neigh;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
switch (event->event) {
|
|
case IB_CM_DREQ_RECEIVED:
|
|
ipoib_dbg(priv, "DREQ received.\n");
|
|
ib_send_cm_drep(cm_id, NULL, 0);
|
|
break;
|
|
case IB_CM_REP_RECEIVED:
|
|
ipoib_dbg(priv, "REP received.\n");
|
|
ret = ipoib_cm_rep_handler(cm_id, event);
|
|
if (ret)
|
|
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
|
|
NULL, 0, NULL, 0);
|
|
break;
|
|
case IB_CM_REQ_ERROR:
|
|
case IB_CM_REJ_RECEIVED:
|
|
case IB_CM_TIMEWAIT_EXIT:
|
|
ipoib_dbg(priv, "CM error %d.\n", event->event);
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
neigh = tx->neigh;
|
|
|
|
if (neigh) {
|
|
neigh->cm = NULL;
|
|
ipoib_neigh_free(neigh);
|
|
|
|
tx->neigh = NULL;
|
|
}
|
|
|
|
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
|
|
list_move(&tx->list, &priv->cm.reap_list);
|
|
queue_work(ipoib_workqueue, &priv->cm.reap_task);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
|
|
struct ipoib_neigh *neigh)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ipoib_cm_tx *tx;
|
|
|
|
tx = kzalloc(sizeof *tx, GFP_ATOMIC);
|
|
if (!tx)
|
|
return NULL;
|
|
|
|
neigh->cm = tx;
|
|
tx->neigh = neigh;
|
|
tx->path = path;
|
|
tx->dev = dev;
|
|
list_add(&tx->list, &priv->cm.start_list);
|
|
set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
|
|
queue_work(ipoib_workqueue, &priv->cm.start_task);
|
|
return tx;
|
|
}
|
|
|
|
void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
|
|
unsigned long flags;
|
|
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
list_move(&tx->list, &priv->cm.reap_list);
|
|
queue_work(ipoib_workqueue, &priv->cm.reap_task);
|
|
ipoib_dbg(priv, "Reap connection for gid %pI6\n",
|
|
tx->neigh->daddr + 4);
|
|
tx->neigh = NULL;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
}
|
|
}
|
|
|
|
static void ipoib_cm_tx_start(struct work_struct *work)
|
|
{
|
|
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
|
|
cm.start_task);
|
|
struct net_device *dev = priv->dev;
|
|
struct ipoib_neigh *neigh;
|
|
struct ipoib_cm_tx *p;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
struct ib_sa_path_rec pathrec;
|
|
u32 qpn;
|
|
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
|
|
while (!list_empty(&priv->cm.start_list)) {
|
|
p = list_entry(priv->cm.start_list.next, typeof(*p), list);
|
|
list_del_init(&p->list);
|
|
neigh = p->neigh;
|
|
qpn = IPOIB_QPN(neigh->daddr);
|
|
memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
|
|
ret = ipoib_cm_tx_init(p, qpn, &pathrec);
|
|
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
|
|
if (ret) {
|
|
neigh = p->neigh;
|
|
if (neigh) {
|
|
neigh->cm = NULL;
|
|
ipoib_neigh_free(neigh);
|
|
}
|
|
list_del(&p->list);
|
|
kfree(p);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
}
|
|
|
|
static void ipoib_cm_tx_reap(struct work_struct *work)
|
|
{
|
|
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
|
|
cm.reap_task);
|
|
struct net_device *dev = priv->dev;
|
|
struct ipoib_cm_tx *p;
|
|
unsigned long flags;
|
|
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
|
|
while (!list_empty(&priv->cm.reap_list)) {
|
|
p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
|
|
list_del(&p->list);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
ipoib_cm_tx_destroy(p);
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
}
|
|
|
|
static void ipoib_cm_skb_reap(struct work_struct *work)
|
|
{
|
|
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
|
|
cm.skb_task);
|
|
struct net_device *dev = priv->dev;
|
|
struct sk_buff *skb;
|
|
unsigned long flags;
|
|
unsigned mtu = priv->mcast_mtu;
|
|
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
|
|
while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else if (skb->protocol == htons(ETH_P_IPV6))
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
#endif
|
|
dev_kfree_skb_any(skb);
|
|
|
|
netif_tx_lock_bh(dev);
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
netif_tx_unlock_bh(dev);
|
|
}
|
|
|
|
void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
|
|
unsigned int mtu)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
int e = skb_queue_empty(&priv->cm.skb_queue);
|
|
|
|
if (skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
|
|
|
|
skb_queue_tail(&priv->cm.skb_queue, skb);
|
|
if (e)
|
|
queue_work(ipoib_workqueue, &priv->cm.skb_task);
|
|
}
|
|
|
|
static void ipoib_cm_rx_reap(struct work_struct *work)
|
|
{
|
|
ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
|
|
cm.rx_reap_task)->dev);
|
|
}
|
|
|
|
static void ipoib_cm_stale_task(struct work_struct *work)
|
|
{
|
|
struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
|
|
cm.stale_task.work);
|
|
struct ipoib_cm_rx *p;
|
|
int ret;
|
|
|
|
spin_lock_irq(&priv->lock);
|
|
while (!list_empty(&priv->cm.passive_ids)) {
|
|
/* List is sorted by LRU, start from tail,
|
|
* stop when we see a recently used entry */
|
|
p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
|
|
if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
|
|
break;
|
|
list_move(&p->list, &priv->cm.rx_error_list);
|
|
p->state = IPOIB_CM_RX_ERROR;
|
|
spin_unlock_irq(&priv->lock);
|
|
ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
|
|
if (ret)
|
|
ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
|
|
spin_lock_irq(&priv->lock);
|
|
}
|
|
|
|
if (!list_empty(&priv->cm.passive_ids))
|
|
queue_delayed_work(ipoib_workqueue,
|
|
&priv->cm.stale_task, IPOIB_CM_RX_DELAY);
|
|
spin_unlock_irq(&priv->lock);
|
|
}
|
|
|
|
|
|
static ssize_t show_mode(struct device *d, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
|
|
|
|
if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
|
|
return sprintf(buf, "connected\n");
|
|
else
|
|
return sprintf(buf, "datagram\n");
|
|
}
|
|
|
|
static ssize_t set_mode(struct device *d, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct net_device *dev = to_net_dev(d);
|
|
int ret;
|
|
|
|
if (!rtnl_trylock())
|
|
return restart_syscall();
|
|
|
|
ret = ipoib_set_mode(dev, buf);
|
|
|
|
rtnl_unlock();
|
|
|
|
if (!ret)
|
|
return count;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
|
|
|
|
int ipoib_cm_add_mode_attr(struct net_device *dev)
|
|
{
|
|
return device_create_file(&dev->dev, &dev_attr_mode);
|
|
}
|
|
|
|
static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
struct ib_srq_init_attr srq_init_attr = {
|
|
.srq_type = IB_SRQT_BASIC,
|
|
.attr = {
|
|
.max_wr = ipoib_recvq_size,
|
|
.max_sge = max_sge
|
|
}
|
|
};
|
|
|
|
priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
|
|
if (IS_ERR(priv->cm.srq)) {
|
|
if (PTR_ERR(priv->cm.srq) != -ENOSYS)
|
|
printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
|
|
priv->ca->name, PTR_ERR(priv->cm.srq));
|
|
priv->cm.srq = NULL;
|
|
return;
|
|
}
|
|
|
|
priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
|
|
if (!priv->cm.srq_ring) {
|
|
printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
|
|
priv->ca->name, ipoib_recvq_size);
|
|
ib_destroy_srq(priv->cm.srq);
|
|
priv->cm.srq = NULL;
|
|
return;
|
|
}
|
|
|
|
}
|
|
|
|
int ipoib_cm_dev_init(struct net_device *dev)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
int i, ret;
|
|
struct ib_device_attr attr;
|
|
|
|
INIT_LIST_HEAD(&priv->cm.passive_ids);
|
|
INIT_LIST_HEAD(&priv->cm.reap_list);
|
|
INIT_LIST_HEAD(&priv->cm.start_list);
|
|
INIT_LIST_HEAD(&priv->cm.rx_error_list);
|
|
INIT_LIST_HEAD(&priv->cm.rx_flush_list);
|
|
INIT_LIST_HEAD(&priv->cm.rx_drain_list);
|
|
INIT_LIST_HEAD(&priv->cm.rx_reap_list);
|
|
INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
|
|
INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
|
|
INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
|
|
INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
|
|
INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
|
|
|
|
skb_queue_head_init(&priv->cm.skb_queue);
|
|
|
|
ret = ib_query_device(priv->ca, &attr);
|
|
if (ret) {
|
|
printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
|
|
|
|
attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
|
|
ipoib_cm_create_srq(dev, attr.max_srq_sge);
|
|
if (ipoib_cm_has_srq(dev)) {
|
|
priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
|
|
priv->cm.num_frags = attr.max_srq_sge;
|
|
ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
|
|
priv->cm.max_cm_mtu, priv->cm.num_frags);
|
|
} else {
|
|
priv->cm.max_cm_mtu = IPOIB_CM_MTU;
|
|
priv->cm.num_frags = IPOIB_CM_RX_SG;
|
|
}
|
|
|
|
ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
|
|
|
|
if (ipoib_cm_has_srq(dev)) {
|
|
for (i = 0; i < ipoib_recvq_size; ++i) {
|
|
if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
|
|
priv->cm.num_frags - 1,
|
|
priv->cm.srq_ring[i].mapping)) {
|
|
ipoib_warn(priv, "failed to allocate "
|
|
"receive buffer %d\n", i);
|
|
ipoib_cm_dev_cleanup(dev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (ipoib_cm_post_receive_srq(dev, i)) {
|
|
ipoib_warn(priv, "ipoib_cm_post_receive_srq "
|
|
"failed for buf %d\n", i);
|
|
ipoib_cm_dev_cleanup(dev);
|
|
return -EIO;
|
|
}
|
|
}
|
|
}
|
|
|
|
priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
|
|
return 0;
|
|
}
|
|
|
|
void ipoib_cm_dev_cleanup(struct net_device *dev)
|
|
{
|
|
struct ipoib_dev_priv *priv = netdev_priv(dev);
|
|
int ret;
|
|
|
|
if (!priv->cm.srq)
|
|
return;
|
|
|
|
ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
|
|
|
|
ret = ib_destroy_srq(priv->cm.srq);
|
|
if (ret)
|
|
ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
|
|
|
|
priv->cm.srq = NULL;
|
|
if (!priv->cm.srq_ring)
|
|
return;
|
|
|
|
ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
|
|
priv->cm.srq_ring = NULL;
|
|
}
|