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OpenCloudOS-Kernel/drivers/infiniband/ulp/ipoib/ipoib_ib.c

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/*
* 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.
*
* $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
*/
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <rdma/ib_cache.h>
#include <linux/ip.h>
#include <linux/tcp.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
static DEFINE_MUTEX(pkey_mutex);
struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
struct ib_pd *pd, struct ib_ah_attr *attr)
{
struct ipoib_ah *ah;
ah = kmalloc(sizeof *ah, GFP_KERNEL);
if (!ah)
return NULL;
ah->dev = dev;
ah->last_send = 0;
kref_init(&ah->ref);
ah->ah = ib_create_ah(pd, attr);
if (IS_ERR(ah->ah)) {
kfree(ah);
ah = NULL;
} else
ipoib_dbg(netdev_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 = netdev_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 int ipoib_ib_post_receive(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_sge list;
struct ib_recv_wr param;
struct ib_recv_wr *bad_wr;
int ret;
list.addr = priv->rx_ring[id].mapping;
list.length = IPOIB_BUF_SIZE;
list.lkey = priv->mr->lkey;
param.next = NULL;
param.wr_id = id | IPOIB_OP_RECV;
param.sg_list = &list;
param.num_sge = 1;
ret = ib_post_recv(priv->qp, &param, &bad_wr);
if (unlikely(ret)) {
ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(priv->rx_ring[id].skb);
priv->rx_ring[id].skb = NULL;
}
return ret;
}
static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
u64 addr;
skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
if (!skb)
return -ENOMEM;
/*
* IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
* header. So we need 4 more bytes to get to 48 and align the
* IP header to a multiple of 16.
*/
skb_reserve(skb, 4);
addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
dev_kfree_skb_any(skb);
return -EIO;
}
priv->rx_ring[id].skb = skb;
priv->rx_ring[id].mapping = addr;
return 0;
}
static int ipoib_ib_post_receives(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_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 = netdev_priv(dev);
unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
struct sk_buff *skb;
u64 addr;
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;
addr = priv->rx_ring[wr_id].mapping;
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);
ib_dma_unmap_single(priv->ca, addr,
IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
priv->rx_ring[wr_id].skb = NULL;
return;
}
/*
* 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)
goto repost;
/*
* 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);
ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
skb_put(skb, wc->byte_len);
skb_pull(skb, IB_GRH_BYTES);
skb->protocol = ((struct ipoib_header *) skb->data)->proto;
skb_reset_mac_header(skb);
skb_pull(skb, IPOIB_ENCAP_LEN);
dev->last_rx = jiffies;
++dev->stats.rx_packets;
dev->stats.rx_bytes += skb->len;
skb->dev = dev;
/* XXX get correct PACKET_ type here */
skb->pkt_type = PACKET_HOST;
if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
skb->ip_summed = CHECKSUM_UNNECESSARY;
netif_receive_skb(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);
}
static 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) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
mapping[i + off] = ib_dma_map_page(ca, frag->page,
frag->page_offset, frag->size,
DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
goto partial_error;
}
return 0;
partial_error:
for (; i > 0; --i) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
}
if (off)
ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
return -EIO;
}
static void ipoib_dma_unmap_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)) {
ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
off = 1;
} else
off = 0;
for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
ib_dma_unmap_page(ca, mapping[i + off], frag->size,
DMA_TO_DEVICE);
}
}
static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
unsigned int wr_id = wc->wr_id;
struct ipoib_tx_buf *tx_req;
unsigned long flags;
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->ca, tx_req);
++dev->stats.tx_packets;
dev->stats.tx_bytes += tx_req->skb->len;
dev_kfree_skb_any(tx_req->skb);
spin_lock_irqsave(&priv->tx_lock, flags);
++priv->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);
spin_unlock_irqrestore(&priv->tx_lock, flags);
if (wc->status != IB_WC_SUCCESS &&
wc->status != IB_WC_WR_FLUSH_ERR)
ipoib_warn(priv, "failed send event "
"(status=%d, wrid=%d vend_err %x)\n",
wc->status, wr_id, wc->vendor_err);
}
int ipoib_poll(struct napi_struct *napi, int budget)
{
struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, 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->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 {
if (wc->wr_id & IPOIB_OP_CM)
ipoib_cm_handle_tx_wc(dev, wc);
else
ipoib_ib_handle_tx_wc(dev, wc);
}
}
if (n != t)
break;
}
if (done < budget) {
netif_rx_complete(dev, napi);
if (unlikely(ib_req_notify_cq(priv->cq,
IB_CQ_NEXT_COMP |
IB_CQ_REPORT_MISSED_EVENTS)) &&
netif_rx_reschedule(dev, napi))
goto poll_more;
}
return done;
}
void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
{
struct net_device *dev = dev_ptr;
struct ipoib_dev_priv *priv = netdev_priv(dev);
netif_rx_schedule(dev, &priv->napi);
}
static inline int post_send(struct ipoib_dev_priv *priv,
unsigned int wr_id,
struct ib_ah *address, u32 qpn,
struct ipoib_tx_buf *tx_req,
void *head, int hlen)
{
struct ib_send_wr *bad_wr;
int i, off;
struct sk_buff *skb = tx_req->skb;
skb_frag_t *frags = skb_shinfo(skb)->frags;
int nr_frags = skb_shinfo(skb)->nr_frags;
u64 *mapping = tx_req->mapping;
if (skb_headlen(skb)) {
priv->tx_sge[0].addr = mapping[0];
priv->tx_sge[0].length = skb_headlen(skb);
off = 1;
} else
off = 0;
for (i = 0; i < nr_frags; ++i) {
priv->tx_sge[i + off].addr = mapping[i + off];
priv->tx_sge[i + off].length = frags[i].size;
}
priv->tx_wr.num_sge = nr_frags + off;
priv->tx_wr.wr_id = wr_id;
priv->tx_wr.wr.ud.remote_qpn = qpn;
priv->tx_wr.wr.ud.ah = address;
if (head) {
priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
priv->tx_wr.wr.ud.header = head;
priv->tx_wr.wr.ud.hlen = hlen;
priv->tx_wr.opcode = IB_WR_LSO;
} else
priv->tx_wr.opcode = IB_WR_SEND;
return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
}
void ipoib_send(struct net_device *dev, struct sk_buff *skb,
struct ipoib_ah *address, u32 qpn)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_tx_buf *tx_req;
int hlen;
void *phead;
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;
}
} 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;
}
phead = NULL;
hlen = 0;
}
ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
skb->len, address, qpn);
/*
* 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;
}
if (skb->ip_summed == CHECKSUM_PARTIAL)
priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
else
priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
address->ah, qpn, tx_req, phead, hlen))) {
ipoib_warn(priv, "post_send failed\n");
++dev->stats.tx_errors;
ipoib_dma_unmap_tx(priv->ca, tx_req);
dev_kfree_skb_any(skb);
} else {
dev->trans_start = jiffies;
address->last_send = priv->tx_head;
++priv->tx_head;
if (++priv->tx_outstanding == ipoib_sendq_size) {
ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
netif_stop_queue(dev);
}
}
}
static void __ipoib_reap_ah(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_ah *ah, *tah;
LIST_HEAD(remove_list);
spin_lock_irq(&priv->tx_lock);
spin_lock(&priv->lock);
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);
ib_destroy_ah(ah->ah);
kfree(ah);
}
spin_unlock(&priv->lock);
spin_unlock_irq(&priv->tx_lock);
}
void ipoib_reap_ah(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
struct net_device *dev = priv->dev;
__ipoib_reap_ah(dev);
if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
round_jiffies_relative(HZ));
}
int ipoib_ib_dev_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int ret;
if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
return -1;
}
set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
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);
ipoib_ib_dev_stop(dev, 1);
return -1;
}
ret = ipoib_cm_dev_open(dev);
if (ret) {
ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
ipoib_ib_dev_stop(dev, 1);
return -1;
}
clear_bit(IPOIB_STOP_REAPER, &priv->flags);
queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
round_jiffies_relative(HZ));
set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
return 0;
}
static void ipoib_pkey_dev_check_presence(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
u16 pkey_index = 0;
if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
else
set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
}
int ipoib_ib_dev_up(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_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 0;
}
set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
return ipoib_mcast_start_thread(dev);
}
int ipoib_ib_dev_down(struct net_device *dev, int flush)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
ipoib_dbg(priv, "downing ib_dev\n");
clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
netif_carrier_off(dev);
/* Shutdown the P_Key thread if still active */
if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
mutex_lock(&pkey_mutex);
set_bit(IPOIB_PKEY_STOP, &priv->flags);
cancel_delayed_work(&priv->pkey_poll_task);
mutex_unlock(&pkey_mutex);
if (flush)
flush_workqueue(ipoib_workqueue);
}
ipoib_mcast_stop_thread(dev, flush);
ipoib_mcast_dev_flush(dev);
ipoib_flush_paths(dev);
return 0;
}
static int recvs_pending(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int pending = 0;
int i;
for (i = 0; i < ipoib_recvq_size; ++i)
if (priv->rx_ring[i].skb)
++pending;
return pending;
}
void ipoib_drain_cq(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int i, n;
do {
n = ib_poll_cq(priv->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 {
if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
else
ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
}
}
} while (n == IPOIB_NUM_WC);
}
int ipoib_ib_dev_stop(struct net_device *dev, int flush)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_attr qp_attr;
unsigned long begin;
struct ipoib_tx_buf *tx_req;
int i;
clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
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))
ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
/* 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->ca, tx_req);
dev_kfree_skb_any(tx_req->skb);
++priv->tx_tail;
--priv->tx_outstanding;
}
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;
ib_dma_unmap_single(priv->ca,
rx_req->mapping,
IPOIB_BUF_SIZE,
DMA_FROM_DEVICE);
dev_kfree_skb_any(rx_req->skb);
rx_req->skb = NULL;
}
goto timeout;
}
ipoib_drain_cq(dev);
msleep(1);
}
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");
/* Wait for all AHs to be reaped */
set_bit(IPOIB_STOP_REAPER, &priv->flags);
cancel_delayed_work(&priv->ah_reap_task);
if (flush)
flush_workqueue(ipoib_workqueue);
begin = jiffies;
while (!list_empty(&priv->dead_ahs)) {
__ipoib_reap_ah(dev);
if (time_after(jiffies, begin + HZ)) {
ipoib_warn(priv, "timing out; will leak address handles\n");
break;
}
msleep(1);
}
ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP);
return 0;
}
int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
priv->ca = ca;
priv->port = port;
priv->qp = NULL;
if (ipoib_transport_dev_init(dev, ca)) {
printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
return -ENODEV;
}
if (dev->flags & IFF_UP) {
if (ipoib_ib_dev_open(dev)) {
ipoib_transport_dev_cleanup(dev);
return -ENODEV;
}
}
return 0;
}
static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
{
struct ipoib_dev_priv *cpriv;
struct net_device *dev = priv->dev;
u16 new_index;
mutex_lock(&priv->vlan_mutex);
/*
* 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, pkey_event);
mutex_unlock(&priv->vlan_mutex);
if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
return;
}
if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
return;
}
if (pkey_event) {
if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
ipoib_ib_dev_down(dev, 0);
ipoib_ib_dev_stop(dev, 0);
if (ipoib_pkey_dev_delay_open(dev))
return;
}
/* restart QP only if P_Key index is changed */
if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
new_index == priv->pkey_index) {
ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
return;
}
priv->pkey_index = new_index;
}
ipoib_dbg(priv, "flushing\n");
ipoib_ib_dev_down(dev, 0);
if (pkey_event) {
ipoib_ib_dev_stop(dev, 0);
ipoib_ib_dev_open(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)) {
ipoib_ib_dev_up(dev);
ipoib_mcast_restart_task(&priv->restart_task);
}
}
void ipoib_ib_dev_flush(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, flush_task);
ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
__ipoib_ib_dev_flush(priv, 0);
}
void ipoib_pkey_event(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, pkey_event_task);
ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
__ipoib_ib_dev_flush(priv, 1);
}
void ipoib_ib_dev_cleanup(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
ipoib_dbg(priv, "cleaning up ib_dev\n");
ipoib_mcast_stop_thread(dev, 1);
ipoib_mcast_dev_flush(dev);
ipoib_transport_dev_cleanup(dev);
}
/*
* Delayed P_Key Assigment Interim Support
*
* The following is initial implementation of delayed P_Key assigment
* mechanism. It is using the same approach implemented for the multicast
* group join. The single goal of this implementation is to quickly address
* Bug #2507. This implementation will probably be removed when the P_Key
* change async notification is available.
*/
void ipoib_pkey_poll(struct work_struct *work)
{
struct ipoib_dev_priv *priv =
container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
struct net_device *dev = priv->dev;
ipoib_pkey_dev_check_presence(dev);
if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
ipoib_open(dev);
else {
mutex_lock(&pkey_mutex);
if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
queue_delayed_work(ipoib_workqueue,
&priv->pkey_poll_task,
HZ);
mutex_unlock(&pkey_mutex);
}
}
int ipoib_pkey_dev_delay_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
/* Look for the interface pkey value in the IB Port P_Key table and */
/* set the interface pkey assigment flag */
ipoib_pkey_dev_check_presence(dev);
/* P_Key value not assigned yet - start polling */
if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
mutex_lock(&pkey_mutex);
clear_bit(IPOIB_PKEY_STOP, &priv->flags);
queue_delayed_work(ipoib_workqueue,
&priv->pkey_poll_task,
HZ);
mutex_unlock(&pkey_mutex);
return 1;
}
return 0;
}
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