/*
* Copyright (c) 2006 Mellanox Technologies. 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 <rdma/ib_cm.h>
#include <net/dst.h>
#include <net/icmp.h>
#include <linux/icmpv6.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
#include "ipoib.h"
int ipoib_max_conn_qp = 128;
module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
MODULE_PARM_DESC(max_nonsrq_conn_qp,
"Max number of connected-mode QPs per interface "
"(applied only if shared receive queue is not available)");
#ifdef [31mCONFIG_INFINIBAND_IPOIB_DEBUG_DATA[0m
static int data_debug_level;
module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
MODULE_PARM_DESC(cm_data_debug_level,
"Enable data path debug tracing for connected mode if > 0");
#endif
#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
#define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
#define IPOIB_CM_RX_UPDATE_MASK (0x3)
#define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
static struct ib_qp_attr ipoib_cm_err_attr = {
.qp_state = IB_QPS_ERR
};
#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
static struct ib_send_wr ipoib_cm_rx_drain_wr = {
.opcode = IB_WR_SEND,
};
static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event);
static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
u64 mapping[IPOIB_CM_RX_SG])
{
int i;
ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
for (i = 0; i < frags; ++i)
ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
}
static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_recv_wr *bad_wr;
int i, ret;
priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
for (i = 0; i < priv->cm.num_frags; ++i)
priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
if (unlikely(ret)) {
ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
priv->cm.srq_ring[id].mapping);
dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
priv->cm.srq_ring[id].skb = NULL;
}
return ret;
}
static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
struct ipoib_cm_rx *rx,
struct ib_recv_wr *wr,
struct ib_sge *sge, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_recv_wr *bad_wr;
int i, ret;
wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
for (i = 0; i < IPOIB_CM_RX_SG; ++i)
sge[i].addr = rx->rx_ring[id].mapping[i];
ret = ib_post_recv(rx->qp, wr, &bad_wr);
if (unlikely(ret)) {
ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
rx->rx_ring[id].mapping);
dev_kfree_skb_any(rx->rx_ring[id].skb);
rx->rx_ring[id].skb = NULL;
}
return ret;
}
static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
struct ipoib_cm_rx_buf *rx_ring,
int id, int frags,
u64 mapping[IPOIB_CM_RX_SG],
gfp_t gfp)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
int i;
skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
if (unlikely(!skb))
return NULL;
/*
* IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
* IP header to a multiple of 16.
*/
skb_reserve(skb, IPOIB_CM_RX_RESERVE);
mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
dev_kfree_skb_any(skb);
return NULL;
}
for (i = 0; i < frags; i++) {
struct page *page = alloc_page(gfp);
if (!page)
goto partial_error;
skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
mapping[i + 1] = ib_dma_map_page(priv->ca, page,
0, PAGE_SIZE, DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
goto partial_error;
}
rx_ring[id].skb = skb;
return skb;
partial_error:
ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
for (; i > 0; --i)
ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
return NULL;
}
static void ipoib_cm_free_rx_ring(struct net_device *dev,
struct ipoib_cm_rx_buf *rx_ring)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int i;
for (i = 0; i < ipoib_recvq_size; ++i)
if (rx_ring[i].skb) {
ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
rx_ring[i].mapping);
dev_kfree_skb_any(rx_ring[i].skb);
}
vfree(rx_ring);
}
static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
{
struct ib_send_wr *bad_wr;
struct ipoib_cm_rx *p;
/* We only reserved 1 extra slot in CQ for drain WRs, so
* make sure we have at most 1 outstanding WR. */
if (list_empty(&priv->cm.rx_flush_list) ||
!list_empty(&priv->cm.rx_drain_list))
return;
/*
* QPs on flush list are error state. This way, a "flush
* error" WC will be immediately generated for each WR we post.
*/
p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
ipoib_warn(priv, "failed to post drain wr\n");
list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
}
static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
{
struct ipoib_cm_rx *p = ctx;
struct ipoib_dev_priv *priv = netdev_priv(p->dev);
unsigned long flags;
if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
return;
spin_lock_irqsave(&priv->lock, flags);
list_move(&p->list, &priv->cm.rx_flush_list);
p->state = IPOIB_CM_RX_FLUSH;
ipoib_cm_start_rx_drain(priv);
spin_unlock_irqrestore(&priv->lock, flags);
}
static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
struct ipoib_cm_rx *p)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_init_attr attr = {
.event_handler = ipoib_cm_rx_event_handler,
.send_cq = priv->recv_cq, /* For drain WR */
.recv_cq = priv->recv_cq,
.srq = priv->cm.srq,
.cap.max_send_wr = 1, /* For drain WR */
.cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
.sq_sig_type = IB_SIGNAL_ALL_WR,
.qp_type = IB_QPT_RC,
.qp_context = p,
};
if (!ipoib_cm_has_srq(dev)) {
attr.cap.max_recv_wr = ipoib_recvq_size;
attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
}
return ib_create_qp(priv->pd, &attr);
}
static int ipoib_cm_modify_rx_qp(struct net_device *dev,
struct ib_cm_id *cm_id, struct ib_qp *qp,
unsigned psn)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
qp_attr.qp_state = IB_QPS_INIT;
ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
return ret;
}
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
return ret;
}
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 = psn;
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
return ret;
}
/*
* Current Mellanox HCA firmware won't generate completions
* with error for drain WRs unless the QP has been moved to
* RTS first. This work-around leaves a window where a QP has
* moved to error asynchronously, but this will eventually get
* fixed in firmware, so let's not error out if modify QP
* fails.
*/
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 0;
}
ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
if (ret) {
ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
return 0;
}
return 0;
}
static void ipoib_cm_init_rx_wr(struct net_device *dev,
struct ib_recv_wr *wr,
struct ib_sge *sge)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
int i;
for (i = 0; i < priv->cm.num_frags; ++i)
sge[i].lkey = priv->pd->local_dma_lkey;
sge[0].length = IPOIB_CM_HEAD_SIZE;
for (i = 1; i < priv->cm.num_frags; ++i)
sge[i].length = PAGE_SIZE;
wr->next = NULL;
wr->sg_list = sge;
wr->num_sge = priv->cm.num_frags;
}
static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
struct ipoib_cm_rx *rx)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct {
struct ib_recv_wr wr;
struct ib_sge sge[IPOIB_CM_RX_SG];
} *t;
int ret;
int i;
rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
if (!rx->rx_ring)
return -ENOMEM;
t = kmalloc(sizeof *t, GFP_KERNEL);
if (!t) {
ret = -ENOMEM;
goto err_free;
}
ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
spin_lock_irq(&priv->lock);
if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
spin_unlock_irq(&priv->lock);
ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
ret = -EINVAL;
goto err_free;
} else
++priv->cm.nonsrq_conn_qp;
spin_unlock_irq(&priv->lock);
for (i = 0; i < ipoib_recvq_size; ++i) {
if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
rx->rx_ring[i].mapping,
GFP_KERNEL)) {
ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
ret = -ENOMEM;
goto err_count;
}
ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
if (ret) {
ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
"failed for buf %d\n", i);
ret = -EIO;
goto err_count;
}
}
rx->recv_count = ipoib_recvq_size;
kfree(t);
return 0;
err_count:
spin_lock_irq(&priv->lock);
--priv->cm.nonsrq_conn_qp;
spin_unlock_irq(&priv->lock);
err_free:
kfree(t);
ipoib_cm_free_rx_ring(dev, rx->rx_ring);
return ret;
}
static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
struct ib_qp *qp, struct ib_cm_req_event_param *req,
unsigned psn)
{
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(priv->wq,
&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(priv->wq, &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(priv->wq, &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 + IPOIB_CM_RX_RESERVE);
if (small_skb) {
skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
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, GFP_ATOMIC);
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_add_pseudo_hdr(skb);
++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,
struct ipoib_tx_buf *tx_req)
{
struct ib_send_wr *bad_wr;
ipoib_build_sge(priv, tx_req);
priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
return ib_post_send(tx->qp, &priv->tx_wr.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_tx_buf *tx_req;
int rc;
unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
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;
}
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;
}
/* 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;
}
}
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;
if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return;
}
skb_orphan(skb);
skb_dst_drop(skb);
rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
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);
} else {
netif_trans_update(dev);
++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_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];
ipoib_dma_unmap_tx(priv, tx_req);
/* 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(priv->wq, &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);
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,
.create_flags = IB_QP_CREATE_USE_GFP_NOIO
};
struct ib_qp *tx_qp;
if (dev->features & NETIF_F_SG)
attr.cap.max_send_sge =
min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
tx_qp = ib_create_qp(priv->pd, &attr);
if (PTR_ERR(tx_qp) == -EINVAL) {
attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
tx_qp = ib_create_qp(priv->pd, &attr);
}
tx->max_send_sge = attr.cap.max_send_sge;
return tx_qp;
}
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 = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
GFP_NOIO, PAGE_KERNEL);
if (!p->tx_ring) {
ret = -ENOMEM;
goto err_tx;
}
memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
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_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)];
ipoib_dma_unmap_tx(priv, tx_req);
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(priv->wq, &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(priv->wq, &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(priv->wq, &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);
}
}
#define QPN_AND_OPTIONS_OFFSET 4
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;
struct ipoib_path *path;
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);
/*
* As long as the search is with these 2 locks,
* path existence indicates its validity.
*/
path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
if (!path) {
pr_info("%s ignore not valid path %pI6\n",
__func__,
neigh->daddr + QPN_AND_OPTIONS_OFFSET);
goto free_neigh;
}
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) {
free_neigh:
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([31mCONFIG_IPV6[0m)
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(priv->wq, &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(priv->wq,
&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;
struct ipoib_dev_priv *priv = netdev_priv(dev);
if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
return -EPERM;
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) {
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 max_srq_sge, i;
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);
ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
ipoib_cm_create_srq(dev, max_srq_sge);
if (ipoib_cm_has_srq(dev)) {
priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
priv->cm.num_frags = 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,
GFP_KERNEL)) {
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;
}