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ipoib_cm.c
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ipoib_cm.c
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/*
* 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 <linux/sched/signal.h>
#include <linux/sched/mm.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 CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
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,
const 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 = ipoib_priv(dev);
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, NULL);
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 = ipoib_priv(dev);
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, NULL);
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 = ipoib_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 = ipoib_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 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, NULL))
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 = ipoib_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 = ipoib_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 int psn)
{
struct ipoib_dev_priv *priv = ipoib_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 = ipoib_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 = ipoib_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(array_size(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_1;
}
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);
err_free_1:
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,
const struct ib_cm_req_event_param *req,
unsigned int psn)
{
struct ipoib_dev_priv *priv = ipoib_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,
const struct ib_cm_event *event)
{
struct net_device *dev = cm_id->context;
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_cm_rx *p;
unsigned int 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,
const 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:
ib_send_cm_drep(cm_id, NULL, 0);
fallthrough;
case IB_CM_REJ_RECEIVED:
p = cm_id->context;
priv = ipoib_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");
fallthrough;
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_t(unsigned int, length, 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 = ipoib_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_t(u32, wc->byte_len, 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)
{
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, NULL);
}
void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_tx_buf *tx_req;
int rc;
unsigned int 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;
}
if ((priv->global_tx_head - priv->global_tx_tail) ==
ipoib_sendq_size - 1) {
ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
tx->qp->qp_num);
netif_stop_queue(dev);
}
skb_orphan(skb);
skb_dst_drop(skb);
if (netif_queue_stopped(dev)) {
rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
IB_CQ_REPORT_MISSED_EVENTS);
if (unlikely(rc < 0))
ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
else if (rc)
napi_schedule(&priv->send_napi);
}
rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
if (unlikely(rc)) {
ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
++dev->stats.tx_errors;
ipoib_dma_unmap_tx(priv, tx_req);
dev_kfree_skb_any(skb);
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
} else {
netif_trans_update(dev);
++tx->tx_head;
++priv->global_tx_head;
}
}
void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = ipoib_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;
++priv->global_tx_tail;
if (unlikely(netif_queue_stopped(dev) &&
((priv->global_tx_head - priv->global_tx_tail) <=
ipoib_sendq_size >> 1) &&
test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
netif_wake_queue(dev);
if (wc->status != IB_WC_SUCCESS &&
wc->status != IB_WC_WR_FLUSH_ERR) {
struct ipoib_neigh *neigh;
/* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
* so don't make waves.
*/
if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
wc->status == IB_WC_RETRY_EXC_ERR)
ipoib_dbg(priv,
"%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
__func__, wc->status, wr_id, wc->vendor_err);
else
ipoib_warn(priv,
"%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
__func__, 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 = ipoib_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)) {
pr_warn("%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) {
pr_warn("%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 = ipoib_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 = ipoib_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);
usleep_range(1000, 2000);
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,
const struct ib_cm_event *event)
{
struct ipoib_cm_tx *p = cm_id->context;
struct ipoib_dev_priv *priv = ipoib_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);