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linux-zen-server/drivers/infiniband/hw/cxgb4/device.c

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/*
* Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include <linux/math64.h>
#include <rdma/ib_verbs.h>
#include "iw_cxgb4.h"
#define DRV_VERSION "0.1"
MODULE_AUTHOR("Steve Wise");
MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
MODULE_LICENSE("Dual BSD/GPL");
static int allow_db_fc_on_t5;
module_param(allow_db_fc_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_fc_on_t5,
"Allow DB Flow Control on T5 (default = 0)");
static int allow_db_coalescing_on_t5;
module_param(allow_db_coalescing_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_coalescing_on_t5,
"Allow DB Coalescing on T5 (default = 0)");
int c4iw_wr_log = 0;
module_param(c4iw_wr_log, int, 0444);
MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
static int c4iw_wr_log_size_order = 12;
module_param(c4iw_wr_log_size_order, int, 0444);
MODULE_PARM_DESC(c4iw_wr_log_size_order,
"Number of entries (log2) in the work request timing log.");
static LIST_HEAD(uld_ctx_list);
static DEFINE_MUTEX(dev_mutex);
static struct workqueue_struct *reg_workq;
#define DB_FC_RESUME_SIZE 64
#define DB_FC_RESUME_DELAY 1
#define DB_FC_DRAIN_THRESH 0
static struct dentry *c4iw_debugfs_root;
struct c4iw_debugfs_data {
struct c4iw_dev *devp;
char *buf;
int bufsize;
int pos;
};
static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
struct c4iw_debugfs_data *d = file->private_data;
return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
}
void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
{
struct wr_log_entry le;
int idx;
if (!wq->rdev->wr_log)
return;
idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
(wq->rdev->wr_log_size - 1);
le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
le.poll_host_time = ktime_get();
le.valid = 1;
le.cqe_sge_ts = CQE_TS(cqe);
if (SQ_TYPE(cqe)) {
le.qid = wq->sq.qid;
le.opcode = CQE_OPCODE(cqe);
le.post_host_time = wq->sq.sw_sq[wq->sq.cidx].host_time;
le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
le.wr_id = CQE_WRID_SQ_IDX(cqe);
} else {
le.qid = wq->rq.qid;
le.opcode = FW_RI_RECEIVE;
le.post_host_time = wq->rq.sw_rq[wq->rq.cidx].host_time;
le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
le.wr_id = CQE_WRID_MSN(cqe);
}
wq->rdev->wr_log[idx] = le;
}
static int wr_log_show(struct seq_file *seq, void *v)
{
struct c4iw_dev *dev = seq->private;
ktime_t prev_time;
struct wr_log_entry *lep;
int prev_time_set = 0;
int idx, end;
#define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
idx = atomic_read(&dev->rdev.wr_log_idx) &
(dev->rdev.wr_log_size - 1);
end = idx - 1;
if (end < 0)
end = dev->rdev.wr_log_size - 1;
lep = &dev->rdev.wr_log[idx];
while (idx != end) {
if (lep->valid) {
if (!prev_time_set) {
prev_time_set = 1;
prev_time = lep->poll_host_time;
}
seq_printf(seq, "%04u: nsec %llu qid %u opcode "
"%u %s 0x%x host_wr_delta nsec %llu "
"post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
"poll_sge_ts 0x%llx post_poll_delta_ns %llu "
"cqe_poll_delta_ns %llu\n",
idx,
ktime_to_ns(ktime_sub(lep->poll_host_time,
prev_time)),
lep->qid, lep->opcode,
lep->opcode == FW_RI_RECEIVE ?
"msn" : "wrid",
lep->wr_id,
ktime_to_ns(ktime_sub(lep->poll_host_time,
lep->post_host_time)),
lep->post_sge_ts, lep->cqe_sge_ts,
lep->poll_sge_ts,
ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
prev_time = lep->poll_host_time;
}
idx++;
if (idx > (dev->rdev.wr_log_size - 1))
idx = 0;
lep = &dev->rdev.wr_log[idx];
}
#undef ts2ns
return 0;
}
static int wr_log_open(struct inode *inode, struct file *file)
{
return single_open(file, wr_log_show, inode->i_private);
}
static ssize_t wr_log_clear(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
int i;
if (dev->rdev.wr_log)
for (i = 0; i < dev->rdev.wr_log_size; i++)
dev->rdev.wr_log[i].valid = 0;
return count;
}
static const struct file_operations wr_log_debugfs_fops = {
.owner = THIS_MODULE,
.open = wr_log_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek,
.write = wr_log_clear,
};
static struct sockaddr_in zero_sin = {
.sin_family = AF_INET,
};
static struct sockaddr_in6 zero_sin6 = {
.sin6_family = AF_INET6,
};
static void set_ep_sin_addrs(struct c4iw_ep *ep,
struct sockaddr_in **lsin,
struct sockaddr_in **rsin,
struct sockaddr_in **m_lsin,
struct sockaddr_in **m_rsin)
{
struct iw_cm_id *id = ep->com.cm_id;
*m_lsin = (struct sockaddr_in *)&ep->com.local_addr;
*m_rsin = (struct sockaddr_in *)&ep->com.remote_addr;
if (id) {
*lsin = (struct sockaddr_in *)&id->local_addr;
*rsin = (struct sockaddr_in *)&id->remote_addr;
} else {
*lsin = &zero_sin;
*rsin = &zero_sin;
}
}
static void set_ep_sin6_addrs(struct c4iw_ep *ep,
struct sockaddr_in6 **lsin6,
struct sockaddr_in6 **rsin6,
struct sockaddr_in6 **m_lsin6,
struct sockaddr_in6 **m_rsin6)
{
struct iw_cm_id *id = ep->com.cm_id;
*m_lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
*m_rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
if (id) {
*lsin6 = (struct sockaddr_in6 *)&id->local_addr;
*rsin6 = (struct sockaddr_in6 *)&id->remote_addr;
} else {
*lsin6 = &zero_sin6;
*rsin6 = &zero_sin6;
}
}
static int dump_qp(unsigned long id, struct c4iw_qp *qp,
struct c4iw_debugfs_data *qpd)
{
int space;
int cc;
if (id != qp->wq.sq.qid)
return 0;
space = qpd->bufsize - qpd->pos - 1;
if (space == 0)
return 1;
if (qp->ep) {
struct c4iw_ep *ep = qp->ep;
if (ep->com.local_addr.ss_family == AF_INET) {
struct sockaddr_in *lsin;
struct sockaddr_in *rsin;
struct sockaddr_in *m_lsin;
struct sockaddr_in *m_rsin;
set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
cc = snprintf(qpd->buf + qpd->pos, space,
"rc qp sq id %u %s id %u state %u "
"onchip %u ep tid %u state %u "
"%pI4:%u/%u->%pI4:%u/%u\n",
qp->wq.sq.qid, qp->srq ? "srq" : "rq",
qp->srq ? qp->srq->idx : qp->wq.rq.qid,
(int)qp->attr.state,
qp->wq.sq.flags & T4_SQ_ONCHIP,
ep->hwtid, (int)ep->com.state,
&lsin->sin_addr, ntohs(lsin->sin_port),
ntohs(m_lsin->sin_port),
&rsin->sin_addr, ntohs(rsin->sin_port),
ntohs(m_rsin->sin_port));
} else {
struct sockaddr_in6 *lsin6;
struct sockaddr_in6 *rsin6;
struct sockaddr_in6 *m_lsin6;
struct sockaddr_in6 *m_rsin6;
set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
&m_rsin6);
cc = snprintf(qpd->buf + qpd->pos, space,
"rc qp sq id %u rq id %u state %u "
"onchip %u ep tid %u state %u "
"%pI6:%u/%u->%pI6:%u/%u\n",
qp->wq.sq.qid, qp->wq.rq.qid,
(int)qp->attr.state,
qp->wq.sq.flags & T4_SQ_ONCHIP,
ep->hwtid, (int)ep->com.state,
&lsin6->sin6_addr,
ntohs(lsin6->sin6_port),
ntohs(m_lsin6->sin6_port),
&rsin6->sin6_addr,
ntohs(rsin6->sin6_port),
ntohs(m_rsin6->sin6_port));
}
} else
cc = snprintf(qpd->buf + qpd->pos, space,
"qp sq id %u rq id %u state %u onchip %u\n",
qp->wq.sq.qid, qp->wq.rq.qid,
(int)qp->attr.state,
qp->wq.sq.flags & T4_SQ_ONCHIP);
if (cc < space)
qpd->pos += cc;
return 0;
}
static int qp_release(struct inode *inode, struct file *file)
{
struct c4iw_debugfs_data *qpd = file->private_data;
if (!qpd) {
pr_info("%s null qpd?\n", __func__);
return 0;
}
vfree(qpd->buf);
kfree(qpd);
return 0;
}
static int qp_open(struct inode *inode, struct file *file)
{
struct c4iw_qp *qp;
struct c4iw_debugfs_data *qpd;
unsigned long index;
int count = 1;
qpd = kmalloc(sizeof(*qpd), GFP_KERNEL);
if (!qpd)
return -ENOMEM;
qpd->devp = inode->i_private;
qpd->pos = 0;
/*
* No need to lock; we drop the lock to call vmalloc so it's racy
* anyway. Someone who cares should switch this over to seq_file
*/
xa_for_each(&qpd->devp->qps, index, qp)
count++;
qpd->bufsize = count * 180;
qpd->buf = vmalloc(qpd->bufsize);
if (!qpd->buf) {
kfree(qpd);
return -ENOMEM;
}
xa_lock_irq(&qpd->devp->qps);
xa_for_each(&qpd->devp->qps, index, qp)
dump_qp(index, qp, qpd);
xa_unlock_irq(&qpd->devp->qps);
qpd->buf[qpd->pos++] = 0;
file->private_data = qpd;
return 0;
}
static const struct file_operations qp_debugfs_fops = {
.owner = THIS_MODULE,
.open = qp_open,
.release = qp_release,
.read = debugfs_read,
.llseek = default_llseek,
};
static int dump_stag(unsigned long id, struct c4iw_debugfs_data *stagd)
{
int space;
int cc;
struct fw_ri_tpte tpte;
int ret;
space = stagd->bufsize - stagd->pos - 1;
if (space == 0)
return 1;
ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
(__be32 *)&tpte);
if (ret) {
dev_err(&stagd->devp->rdev.lldi.pdev->dev,
"%s cxgb4_read_tpte err %d\n", __func__, ret);
return ret;
}
cc = snprintf(stagd->buf + stagd->pos, space,
"stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
"perm 0x%x ps %d len 0x%llx va 0x%llx\n",
(u32)id<<8,
FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
if (cc < space)
stagd->pos += cc;
return 0;
}
static int stag_release(struct inode *inode, struct file *file)
{
struct c4iw_debugfs_data *stagd = file->private_data;
if (!stagd) {
pr_info("%s null stagd?\n", __func__);
return 0;
}
vfree(stagd->buf);
kfree(stagd);
return 0;
}
static int stag_open(struct inode *inode, struct file *file)
{
struct c4iw_debugfs_data *stagd;
void *p;
unsigned long index;
int ret = 0;
int count = 1;
stagd = kmalloc(sizeof(*stagd), GFP_KERNEL);
if (!stagd) {
ret = -ENOMEM;
goto out;
}
stagd->devp = inode->i_private;
stagd->pos = 0;
xa_for_each(&stagd->devp->mrs, index, p)
count++;
stagd->bufsize = count * 256;
stagd->buf = vmalloc(stagd->bufsize);
if (!stagd->buf) {
ret = -ENOMEM;
goto err1;
}
xa_lock_irq(&stagd->devp->mrs);
xa_for_each(&stagd->devp->mrs, index, p)
dump_stag(index, stagd);
xa_unlock_irq(&stagd->devp->mrs);
stagd->buf[stagd->pos++] = 0;
file->private_data = stagd;
goto out;
err1:
kfree(stagd);
out:
return ret;
}
static const struct file_operations stag_debugfs_fops = {
.owner = THIS_MODULE,
.open = stag_open,
.release = stag_release,
.read = debugfs_read,
.llseek = default_llseek,
};
static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
static int stats_show(struct seq_file *seq, void *v)
{
struct c4iw_dev *dev = seq->private;
seq_printf(seq, " Object: %10s %10s %10s %10s\n", "Total", "Current",
"Max", "Fail");
seq_printf(seq, " PDID: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
seq_printf(seq, " QID: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
seq_printf(seq, " SRQS: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.srqt.total, dev->rdev.stats.srqt.cur,
dev->rdev.stats.srqt.max, dev->rdev.stats.srqt.fail);
seq_printf(seq, " TPTMEM: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
seq_printf(seq, " PBLMEM: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
seq_printf(seq, " RQTMEM: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
seq_printf(seq, " OCQPMEM: %10llu %10llu %10llu %10llu\n",
dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
seq_printf(seq, " DB FULL: %10llu\n", dev->rdev.stats.db_full);
seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
seq_printf(seq, " DB DROP: %10llu\n", dev->rdev.stats.db_drop);
seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
db_state_str[dev->db_state],
dev->rdev.stats.db_state_transitions,
dev->rdev.stats.db_fc_interruptions);
seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
dev->rdev.stats.act_ofld_conn_fails);
seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
dev->rdev.stats.pas_ofld_conn_fails);
seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
return 0;
}
static int stats_open(struct inode *inode, struct file *file)
{
return single_open(file, stats_show, inode->i_private);
}
static ssize_t stats_clear(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
mutex_lock(&dev->rdev.stats.lock);
dev->rdev.stats.pd.max = 0;
dev->rdev.stats.pd.fail = 0;
dev->rdev.stats.qid.max = 0;
dev->rdev.stats.qid.fail = 0;
dev->rdev.stats.stag.max = 0;
dev->rdev.stats.stag.fail = 0;
dev->rdev.stats.pbl.max = 0;
dev->rdev.stats.pbl.fail = 0;
dev->rdev.stats.rqt.max = 0;
dev->rdev.stats.rqt.fail = 0;
dev->rdev.stats.rqt.max = 0;
dev->rdev.stats.rqt.fail = 0;
dev->rdev.stats.ocqp.max = 0;
dev->rdev.stats.ocqp.fail = 0;
dev->rdev.stats.db_full = 0;
dev->rdev.stats.db_empty = 0;
dev->rdev.stats.db_drop = 0;
dev->rdev.stats.db_state_transitions = 0;
dev->rdev.stats.tcam_full = 0;
dev->rdev.stats.act_ofld_conn_fails = 0;
dev->rdev.stats.pas_ofld_conn_fails = 0;
mutex_unlock(&dev->rdev.stats.lock);
return count;
}
static const struct file_operations stats_debugfs_fops = {
.owner = THIS_MODULE,
.open = stats_open,
.release = single_release,
.read = seq_read,
.llseek = seq_lseek,
.write = stats_clear,
};
static int dump_ep(struct c4iw_ep *ep, struct c4iw_debugfs_data *epd)
{
int space;
int cc;
space = epd->bufsize - epd->pos - 1;
if (space == 0)
return 1;
if (ep->com.local_addr.ss_family == AF_INET) {
struct sockaddr_in *lsin;
struct sockaddr_in *rsin;
struct sockaddr_in *m_lsin;
struct sockaddr_in *m_rsin;
set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
cc = snprintf(epd->buf + epd->pos, space,
"ep %p cm_id %p qp %p state %d flags 0x%lx "
"history 0x%lx hwtid %d atid %d "
"conn_na %u abort_na %u "
"%pI4:%d/%d <-> %pI4:%d/%d\n",
ep, ep->com.cm_id, ep->com.qp,
(int)ep->com.state, ep->com.flags,
ep->com.history, ep->hwtid, ep->atid,
ep->stats.connect_neg_adv,
ep->stats.abort_neg_adv,
&lsin->sin_addr, ntohs(lsin->sin_port),
ntohs(m_lsin->sin_port),
&rsin->sin_addr, ntohs(rsin->sin_port),
ntohs(m_rsin->sin_port));
} else {
struct sockaddr_in6 *lsin6;
struct sockaddr_in6 *rsin6;
struct sockaddr_in6 *m_lsin6;
struct sockaddr_in6 *m_rsin6;
set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
cc = snprintf(epd->buf + epd->pos, space,
"ep %p cm_id %p qp %p state %d flags 0x%lx "
"history 0x%lx hwtid %d atid %d "
"conn_na %u abort_na %u "
"%pI6:%d/%d <-> %pI6:%d/%d\n",
ep, ep->com.cm_id, ep->com.qp,
(int)ep->com.state, ep->com.flags,
ep->com.history, ep->hwtid, ep->atid,
ep->stats.connect_neg_adv,
ep->stats.abort_neg_adv,
&lsin6->sin6_addr, ntohs(lsin6->sin6_port),
ntohs(m_lsin6->sin6_port),
&rsin6->sin6_addr, ntohs(rsin6->sin6_port),
ntohs(m_rsin6->sin6_port));
}
if (cc < space)
epd->pos += cc;
return 0;
}
static
int dump_listen_ep(struct c4iw_listen_ep *ep, struct c4iw_debugfs_data *epd)
{
int space;
int cc;
space = epd->bufsize - epd->pos - 1;
if (space == 0)
return 1;
if (ep->com.local_addr.ss_family == AF_INET) {
struct sockaddr_in *lsin = (struct sockaddr_in *)
&ep->com.cm_id->local_addr;
struct sockaddr_in *m_lsin = (struct sockaddr_in *)
&ep->com.cm_id->m_local_addr;
cc = snprintf(epd->buf + epd->pos, space,
"ep %p cm_id %p state %d flags 0x%lx stid %d "
"backlog %d %pI4:%d/%d\n",
ep, ep->com.cm_id, (int)ep->com.state,
ep->com.flags, ep->stid, ep->backlog,
&lsin->sin_addr, ntohs(lsin->sin_port),
ntohs(m_lsin->sin_port));
} else {
struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
&ep->com.cm_id->local_addr;
struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
&ep->com.cm_id->m_local_addr;
cc = snprintf(epd->buf + epd->pos, space,
"ep %p cm_id %p state %d flags 0x%lx stid %d "
"backlog %d %pI6:%d/%d\n",
ep, ep->com.cm_id, (int)ep->com.state,
ep->com.flags, ep->stid, ep->backlog,
&lsin6->sin6_addr, ntohs(lsin6->sin6_port),
ntohs(m_lsin6->sin6_port));
}
if (cc < space)
epd->pos += cc;
return 0;
}
static int ep_release(struct inode *inode, struct file *file)
{
struct c4iw_debugfs_data *epd = file->private_data;
if (!epd) {
pr_info("%s null qpd?\n", __func__);
return 0;
}
vfree(epd->buf);
kfree(epd);
return 0;
}
static int ep_open(struct inode *inode, struct file *file)
{
struct c4iw_ep *ep;
struct c4iw_listen_ep *lep;
unsigned long index;
struct c4iw_debugfs_data *epd;
int ret = 0;
int count = 1;
epd = kmalloc(sizeof(*epd), GFP_KERNEL);
if (!epd) {
ret = -ENOMEM;
goto out;
}
epd->devp = inode->i_private;
epd->pos = 0;
xa_for_each(&epd->devp->hwtids, index, ep)
count++;
xa_for_each(&epd->devp->atids, index, ep)
count++;
xa_for_each(&epd->devp->stids, index, lep)
count++;
epd->bufsize = count * 240;
epd->buf = vmalloc(epd->bufsize);
if (!epd->buf) {
ret = -ENOMEM;
goto err1;
}
xa_lock_irq(&epd->devp->hwtids);
xa_for_each(&epd->devp->hwtids, index, ep)
dump_ep(ep, epd);
xa_unlock_irq(&epd->devp->hwtids);
xa_lock_irq(&epd->devp->atids);
xa_for_each(&epd->devp->atids, index, ep)
dump_ep(ep, epd);
xa_unlock_irq(&epd->devp->atids);
xa_lock_irq(&epd->devp->stids);
xa_for_each(&epd->devp->stids, index, lep)
dump_listen_ep(lep, epd);
xa_unlock_irq(&epd->devp->stids);
file->private_data = epd;
goto out;
err1:
kfree(epd);
out:
return ret;
}
static const struct file_operations ep_debugfs_fops = {
.owner = THIS_MODULE,
.open = ep_open,
.release = ep_release,
.read = debugfs_read,
};
static void setup_debugfs(struct c4iw_dev *devp)
{
debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
(void *)devp, &qp_debugfs_fops, 4096);
debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
(void *)devp, &stag_debugfs_fops, 4096);
debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
(void *)devp, &stats_debugfs_fops, 4096);
debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
(void *)devp, &ep_debugfs_fops, 4096);
if (c4iw_wr_log)
debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
(void *)devp, &wr_log_debugfs_fops, 4096);
}
void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
struct c4iw_dev_ucontext *uctx)
{
struct list_head *pos, *nxt;
struct c4iw_qid_list *entry;
mutex_lock(&uctx->lock);
list_for_each_safe(pos, nxt, &uctx->qpids) {
entry = list_entry(pos, struct c4iw_qid_list, entry);
list_del_init(&entry->entry);
if (!(entry->qid & rdev->qpmask)) {
c4iw_put_resource(&rdev->resource.qid_table,
entry->qid);
mutex_lock(&rdev->stats.lock);
rdev->stats.qid.cur -= rdev->qpmask + 1;
mutex_unlock(&rdev->stats.lock);
}
kfree(entry);
}
list_for_each_safe(pos, nxt, &uctx->cqids) {
entry = list_entry(pos, struct c4iw_qid_list, entry);
list_del_init(&entry->entry);
kfree(entry);
}
mutex_unlock(&uctx->lock);
}
void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
struct c4iw_dev_ucontext *uctx)
{
INIT_LIST_HEAD(&uctx->qpids);
INIT_LIST_HEAD(&uctx->cqids);
mutex_init(&uctx->lock);
}
/* Caller takes care of locking if needed */
static int c4iw_rdev_open(struct c4iw_rdev *rdev)
{
int err;
unsigned int factor;
c4iw_init_dev_ucontext(rdev, &rdev->uctx);
/*
* This implementation assumes udb_density == ucq_density! Eventually
* we might need to support this but for now fail the open. Also the
* cqid and qpid range must match for now.
*/
if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
pr_err("%s: unsupported udb/ucq densities %u/%u\n",
pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
rdev->lldi.ucq_density);
return -EINVAL;
}
if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
rdev->lldi.vr->cq.size);
return -EINVAL;
}
/* This implementation requires a sge_host_page_size <= PAGE_SIZE. */
if (rdev->lldi.sge_host_page_size > PAGE_SIZE) {
pr_err("%s: unsupported sge host page size %u\n",
pci_name(rdev->lldi.pdev),
rdev->lldi.sge_host_page_size);
return -EINVAL;
}
factor = PAGE_SIZE / rdev->lldi.sge_host_page_size;
rdev->qpmask = (rdev->lldi.udb_density * factor) - 1;
rdev->cqmask = (rdev->lldi.ucq_density * factor) - 1;
pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u srq size %u\n",
pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
rdev->lldi.vr->pbl.start,
rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
rdev->lldi.vr->rq.size,
rdev->lldi.vr->qp.start,
rdev->lldi.vr->qp.size,
rdev->lldi.vr->cq.start,
rdev->lldi.vr->cq.size,
rdev->lldi.vr->srq.size);
pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
&rdev->lldi.pdev->resource[2],
rdev->lldi.db_reg, rdev->lldi.gts_reg,
rdev->qpmask, rdev->cqmask);
if (c4iw_num_stags(rdev) == 0)
return -EINVAL;
rdev->stats.pd.total = T4_MAX_NUM_PD;
rdev->stats.stag.total = rdev->lldi.vr->stag.size;
rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
rdev->stats.srqt.total = rdev->lldi.vr->srq.size;
rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
rdev->stats.qid.total = rdev->lldi.vr->qp.size;
err = c4iw_init_resource(rdev, c4iw_num_stags(rdev),
T4_MAX_NUM_PD, rdev->lldi.vr->srq.size);
if (err) {
pr_err("error %d initializing resources\n", err);
return err;
}
err = c4iw_pblpool_create(rdev);
if (err) {
pr_err("error %d initializing pbl pool\n", err);
goto destroy_resource;
}
err = c4iw_rqtpool_create(rdev);
if (err) {
pr_err("error %d initializing rqt pool\n", err);
goto destroy_pblpool;
}
err = c4iw_ocqp_pool_create(rdev);
if (err) {
pr_err("error %d initializing ocqp pool\n", err);
goto destroy_rqtpool;
}
rdev->status_page = (struct t4_dev_status_page *)
__get_free_page(GFP_KERNEL);
if (!rdev->status_page) {
err = -ENOMEM;
goto destroy_ocqp_pool;
}
rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
rdev->status_page->write_cmpl_supported = rdev->lldi.write_cmpl_support;
if (c4iw_wr_log) {
rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
sizeof(*rdev->wr_log),
GFP_KERNEL);
if (rdev->wr_log) {
rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
atomic_set(&rdev->wr_log_idx, 0);
}
}
rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
if (!rdev->free_workq) {
err = -ENOMEM;
goto err_free_status_page_and_wr_log;
}
rdev->status_page->db_off = 0;
init_completion(&rdev->rqt_compl);
init_completion(&rdev->pbl_compl);
kref_init(&rdev->rqt_kref);
kref_init(&rdev->pbl_kref);
return 0;
err_free_status_page_and_wr_log:
if (c4iw_wr_log && rdev->wr_log)
kfree(rdev->wr_log);
free_page((unsigned long)rdev->status_page);
destroy_ocqp_pool:
c4iw_ocqp_pool_destroy(rdev);
destroy_rqtpool:
c4iw_rqtpool_destroy(rdev);
destroy_pblpool:
c4iw_pblpool_destroy(rdev);
destroy_resource:
c4iw_destroy_resource(&rdev->resource);
return err;
}
static void c4iw_rdev_close(struct c4iw_rdev *rdev)
{
kfree(rdev->wr_log);
c4iw_release_dev_ucontext(rdev, &rdev->uctx);
free_page((unsigned long)rdev->status_page);
c4iw_pblpool_destroy(rdev);
c4iw_rqtpool_destroy(rdev);
wait_for_completion(&rdev->pbl_compl);
wait_for_completion(&rdev->rqt_compl);
c4iw_ocqp_pool_destroy(rdev);
destroy_workqueue(rdev->free_workq);
c4iw_destroy_resource(&rdev->resource);
}
void c4iw_dealloc(struct uld_ctx *ctx)
{
c4iw_rdev_close(&ctx->dev->rdev);
WARN_ON(!xa_empty(&ctx->dev->cqs));
WARN_ON(!xa_empty(&ctx->dev->qps));
WARN_ON(!xa_empty(&ctx->dev->mrs));
wait_event(ctx->dev->wait, xa_empty(&ctx->dev->hwtids));
WARN_ON(!xa_empty(&ctx->dev->stids));
WARN_ON(!xa_empty(&ctx->dev->atids));
if (ctx->dev->rdev.bar2_kva)
iounmap(ctx->dev->rdev.bar2_kva);
if (ctx->dev->rdev.oc_mw_kva)
iounmap(ctx->dev->rdev.oc_mw_kva);
ib_dealloc_device(&ctx->dev->ibdev);
ctx->dev = NULL;
}
static void c4iw_remove(struct uld_ctx *ctx)
{
pr_debug("c4iw_dev %p\n", ctx->dev);
debugfs_remove_recursive(ctx->dev->debugfs_root);
c4iw_unregister_device(ctx->dev);
c4iw_dealloc(ctx);
}
static int rdma_supported(const struct cxgb4_lld_info *infop)
{
return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
infop->vr->cq.size > 0;
}
static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
{
struct c4iw_dev *devp;
int ret;
if (!rdma_supported(infop)) {
pr_info("%s: RDMA not supported on this device\n",
pci_name(infop->pdev));
return ERR_PTR(-ENOSYS);
}
if (!ocqp_supported(infop))
pr_info("%s: On-Chip Queues not supported on this device\n",
pci_name(infop->pdev));
devp = ib_alloc_device(c4iw_dev, ibdev);
if (!devp) {
pr_err("Cannot allocate ib device\n");
return ERR_PTR(-ENOMEM);
}
devp->rdev.lldi = *infop;
/* init various hw-queue params based on lld info */
pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
devp->rdev.lldi.sge_ingpadboundary,
devp->rdev.lldi.sge_egrstatuspagesize);
devp->rdev.hw_queue.t4_eq_status_entries =
devp->rdev.lldi.sge_egrstatuspagesize / 64;
devp->rdev.hw_queue.t4_max_eq_size = 65520;
devp->rdev.hw_queue.t4_max_iq_size = 65520;
devp->rdev.hw_queue.t4_max_rq_size = 8192 -
devp->rdev.hw_queue.t4_eq_status_entries - 1;
devp->rdev.hw_queue.t4_max_sq_size =
devp->rdev.hw_queue.t4_max_eq_size -
devp->rdev.hw_queue.t4_eq_status_entries - 1;
devp->rdev.hw_queue.t4_max_qp_depth =
devp->rdev.hw_queue.t4_max_rq_size;
devp->rdev.hw_queue.t4_max_cq_depth =
devp->rdev.hw_queue.t4_max_iq_size - 2;
devp->rdev.hw_queue.t4_stat_len =
devp->rdev.lldi.sge_egrstatuspagesize;
/*
* For T5/T6 devices, we map all of BAR2 with WC.
* For T4 devices with onchip qp mem, we map only that part
* of BAR2 with WC.
*/
devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
if (!is_t4(devp->rdev.lldi.adapter_type)) {
devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
pci_resource_len(devp->rdev.lldi.pdev, 2));
if (!devp->rdev.bar2_kva) {
pr_err("Unable to ioremap BAR2\n");
ib_dealloc_device(&devp->ibdev);
return ERR_PTR(-EINVAL);
}
} else if (ocqp_supported(infop)) {
devp->rdev.oc_mw_pa =
pci_resource_start(devp->rdev.lldi.pdev, 2) +
pci_resource_len(devp->rdev.lldi.pdev, 2) -
roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
devp->rdev.lldi.vr->ocq.size);
if (!devp->rdev.oc_mw_kva) {
pr_err("Unable to ioremap onchip mem\n");
ib_dealloc_device(&devp->ibdev);
return ERR_PTR(-EINVAL);
}
}
pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
ret = c4iw_rdev_open(&devp->rdev);
if (ret) {
pr_err("Unable to open CXIO rdev err %d\n", ret);
ib_dealloc_device(&devp->ibdev);
return ERR_PTR(ret);
}
xa_init_flags(&devp->cqs, XA_FLAGS_LOCK_IRQ);
xa_init_flags(&devp->qps, XA_FLAGS_LOCK_IRQ);
xa_init_flags(&devp->mrs, XA_FLAGS_LOCK_IRQ);
xa_init_flags(&devp->hwtids, XA_FLAGS_LOCK_IRQ);
xa_init_flags(&devp->atids, XA_FLAGS_LOCK_IRQ);
xa_init_flags(&devp->stids, XA_FLAGS_LOCK_IRQ);
mutex_init(&devp->rdev.stats.lock);
mutex_init(&devp->db_mutex);
INIT_LIST_HEAD(&devp->db_fc_list);
init_waitqueue_head(&devp->wait);
devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
if (c4iw_debugfs_root) {
devp->debugfs_root = debugfs_create_dir(
pci_name(devp->rdev.lldi.pdev),
c4iw_debugfs_root);
setup_debugfs(devp);
}
return devp;
}
static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
{
struct uld_ctx *ctx;
static int vers_printed;
int i;
if (!vers_printed++)
pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
DRV_VERSION);
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx) {
ctx = ERR_PTR(-ENOMEM);
goto out;
}
ctx->lldi = *infop;
pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
pci_name(ctx->lldi.pdev),
ctx->lldi.nchan, ctx->lldi.nrxq,
ctx->lldi.ntxq, ctx->lldi.nports);
mutex_lock(&dev_mutex);
list_add_tail(&ctx->entry, &uld_ctx_list);
mutex_unlock(&dev_mutex);
for (i = 0; i < ctx->lldi.nrxq; i++)
pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
out:
return ctx;
}
static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
const __be64 *rsp,
u32 pktshift)
{
struct sk_buff *skb;
/*
* Allocate space for cpl_pass_accept_req which will be synthesized by
* driver. Once the driver synthesizes the request the skb will go
* through the regular cpl_pass_accept_req processing.
* The math here assumes sizeof cpl_pass_accept_req >= sizeof
* cpl_rx_pkt.
*/
skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
if (unlikely(!skb))
return NULL;
__skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
sizeof(struct rss_header) - pktshift);
/*
* This skb will contain:
* rss_header from the rspq descriptor (1 flit)
* cpl_rx_pkt struct from the rspq descriptor (2 flits)
* space for the difference between the size of an
* rx_pkt and pass_accept_req cpl (1 flit)
* the packet data from the gl
*/
skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
sizeof(struct rss_header));
skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
sizeof(struct cpl_pass_accept_req),
gl->va + pktshift,
gl->tot_len - pktshift);
return skb;
}
static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
const __be64 *rsp)
{
unsigned int opcode = *(u8 *)rsp;
struct sk_buff *skb;
if (opcode != CPL_RX_PKT)
goto out;
skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
if (skb == NULL)
goto out;
if (c4iw_handlers[opcode] == NULL) {
pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
kfree_skb(skb);
goto out;
}
c4iw_handlers[opcode](dev, skb);
return 1;
out:
return 0;
}
static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
const struct pkt_gl *gl)
{
struct uld_ctx *ctx = handle;
struct c4iw_dev *dev = ctx->dev;
struct sk_buff *skb;
u8 opcode;
if (gl == NULL) {
/* omit RSS and rsp_ctrl at end of descriptor */
unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
skb = alloc_skb(256, GFP_ATOMIC);
if (!skb)
goto nomem;
__skb_put(skb, len);
skb_copy_to_linear_data(skb, &rsp[1], len);
} else if (gl == CXGB4_MSG_AN) {
const struct rsp_ctrl *rc = (void *)rsp;
u32 qid = be32_to_cpu(rc->pldbuflen_qid);
c4iw_ev_handler(dev, qid);
return 0;
} else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
if (recv_rx_pkt(dev, gl, rsp))
return 0;
pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
pci_name(ctx->lldi.pdev), gl->va,
be64_to_cpu(*rsp),
be64_to_cpu(*(__force __be64 *)gl->va),
gl->tot_len);
return 0;
} else {
skb = cxgb4_pktgl_to_skb(gl, 128, 128);
if (unlikely(!skb))
goto nomem;
}
opcode = *(u8 *)rsp;
if (c4iw_handlers[opcode]) {
c4iw_handlers[opcode](dev, skb);
} else {
pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
kfree_skb(skb);
}
return 0;
nomem:
return -1;
}
static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
{
struct uld_ctx *ctx = handle;
pr_debug("new_state %u\n", new_state);
switch (new_state) {
case CXGB4_STATE_UP:
pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
if (!ctx->dev) {
ctx->dev = c4iw_alloc(&ctx->lldi);
if (IS_ERR(ctx->dev)) {
pr_err("%s: initialization failed: %ld\n",
pci_name(ctx->lldi.pdev),
PTR_ERR(ctx->dev));
ctx->dev = NULL;
break;
}
INIT_WORK(&ctx->reg_work, c4iw_register_device);
queue_work(reg_workq, &ctx->reg_work);
}
break;
case CXGB4_STATE_DOWN:
pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
if (ctx->dev)
c4iw_remove(ctx);
break;
case CXGB4_STATE_FATAL_ERROR:
case CXGB4_STATE_START_RECOVERY:
pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
if (ctx->dev) {
struct ib_event event = {};
ctx->dev->rdev.flags |= T4_FATAL_ERROR;
event.event = IB_EVENT_DEVICE_FATAL;
event.device = &ctx->dev->ibdev;
ib_dispatch_event(&event);
c4iw_remove(ctx);
}
break;
case CXGB4_STATE_DETACH:
pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
if (ctx->dev)
c4iw_remove(ctx);
break;
}
return 0;
}
static void stop_queues(struct uld_ctx *ctx)
{
struct c4iw_qp *qp;
unsigned long index, flags;
xa_lock_irqsave(&ctx->dev->qps, flags);
ctx->dev->rdev.stats.db_state_transitions++;
ctx->dev->db_state = STOPPED;
if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
xa_for_each(&ctx->dev->qps, index, qp)
t4_disable_wq_db(&qp->wq);
} else {
ctx->dev->rdev.status_page->db_off = 1;
}
xa_unlock_irqrestore(&ctx->dev->qps, flags);
}
static void resume_rc_qp(struct c4iw_qp *qp)
{
spin_lock(&qp->lock);
t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
qp->wq.sq.wq_pidx_inc = 0;
t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
qp->wq.rq.wq_pidx_inc = 0;
spin_unlock(&qp->lock);
}
static void resume_a_chunk(struct uld_ctx *ctx)
{
int i;
struct c4iw_qp *qp;
for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
db_fc_entry);
list_del_init(&qp->db_fc_entry);
resume_rc_qp(qp);
if (list_empty(&ctx->dev->db_fc_list))
break;
}
}
static void resume_queues(struct uld_ctx *ctx)
{
xa_lock_irq(&ctx->dev->qps);
if (ctx->dev->db_state != STOPPED)
goto out;
ctx->dev->db_state = FLOW_CONTROL;
while (1) {
if (list_empty(&ctx->dev->db_fc_list)) {
struct c4iw_qp *qp;
unsigned long index;
WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
ctx->dev->db_state = NORMAL;
ctx->dev->rdev.stats.db_state_transitions++;
if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
xa_for_each(&ctx->dev->qps, index, qp)
t4_enable_wq_db(&qp->wq);
} else {
ctx->dev->rdev.status_page->db_off = 0;
}
break;
} else {
if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
< (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
DB_FC_DRAIN_THRESH)) {
resume_a_chunk(ctx);
}
if (!list_empty(&ctx->dev->db_fc_list)) {
xa_unlock_irq(&ctx->dev->qps);
if (DB_FC_RESUME_DELAY) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(DB_FC_RESUME_DELAY);
}
xa_lock_irq(&ctx->dev->qps);
if (ctx->dev->db_state != FLOW_CONTROL)
break;
}
}
}
out:
if (ctx->dev->db_state != NORMAL)
ctx->dev->rdev.stats.db_fc_interruptions++;
xa_unlock_irq(&ctx->dev->qps);
}
struct qp_list {
unsigned idx;
struct c4iw_qp **qps;
};
static void deref_qps(struct qp_list *qp_list)
{
int idx;
for (idx = 0; idx < qp_list->idx; idx++)
c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
}
static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
{
int idx;
int ret;
for (idx = 0; idx < qp_list->idx; idx++) {
struct c4iw_qp *qp = qp_list->qps[idx];
xa_lock_irq(&qp->rhp->qps);
spin_lock(&qp->lock);
ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
qp->wq.sq.qid,
t4_sq_host_wq_pidx(&qp->wq),
t4_sq_wq_size(&qp->wq));
if (ret) {
pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
spin_unlock(&qp->lock);
xa_unlock_irq(&qp->rhp->qps);
return;
}
qp->wq.sq.wq_pidx_inc = 0;
ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
qp->wq.rq.qid,
t4_rq_host_wq_pidx(&qp->wq),
t4_rq_wq_size(&qp->wq));
if (ret) {
pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
spin_unlock(&qp->lock);
xa_unlock_irq(&qp->rhp->qps);
return;
}
qp->wq.rq.wq_pidx_inc = 0;
spin_unlock(&qp->lock);
xa_unlock_irq(&qp->rhp->qps);
/* Wait for the dbfifo to drain */
while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(10));
}
}
}
static void recover_queues(struct uld_ctx *ctx)
{
struct c4iw_qp *qp;
unsigned long index;
int count = 0;
struct qp_list qp_list;
int ret;
/* slow everybody down */
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(1000));
/* flush the SGE contexts */
ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
if (ret) {
pr_err("%s: Fatal error - DB overflow recovery failed\n",
pci_name(ctx->lldi.pdev));
return;
}
/* Count active queues so we can build a list of queues to recover */
xa_lock_irq(&ctx->dev->qps);
WARN_ON(ctx->dev->db_state != STOPPED);
ctx->dev->db_state = RECOVERY;
xa_for_each(&ctx->dev->qps, index, qp)
count++;
qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
if (!qp_list.qps) {
xa_unlock_irq(&ctx->dev->qps);
return;
}
qp_list.idx = 0;
/* add and ref each qp so it doesn't get freed */
xa_for_each(&ctx->dev->qps, index, qp) {
c4iw_qp_add_ref(&qp->ibqp);
qp_list.qps[qp_list.idx++] = qp;
}
xa_unlock_irq(&ctx->dev->qps);
/* now traverse the list in a safe context to recover the db state*/
recover_lost_dbs(ctx, &qp_list);
/* we're almost done! deref the qps and clean up */
deref_qps(&qp_list);
kfree(qp_list.qps);
xa_lock_irq(&ctx->dev->qps);
WARN_ON(ctx->dev->db_state != RECOVERY);
ctx->dev->db_state = STOPPED;
xa_unlock_irq(&ctx->dev->qps);
}
static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
{
struct uld_ctx *ctx = handle;
switch (control) {
case CXGB4_CONTROL_DB_FULL:
stop_queues(ctx);
ctx->dev->rdev.stats.db_full++;
break;
case CXGB4_CONTROL_DB_EMPTY:
resume_queues(ctx);
mutex_lock(&ctx->dev->rdev.stats.lock);
ctx->dev->rdev.stats.db_empty++;
mutex_unlock(&ctx->dev->rdev.stats.lock);
break;
case CXGB4_CONTROL_DB_DROP:
recover_queues(ctx);
mutex_lock(&ctx->dev->rdev.stats.lock);
ctx->dev->rdev.stats.db_drop++;
mutex_unlock(&ctx->dev->rdev.stats.lock);
break;
default:
pr_warn("%s: unknown control cmd %u\n",
pci_name(ctx->lldi.pdev), control);
break;
}
return 0;
}
static struct cxgb4_uld_info c4iw_uld_info = {
.name = DRV_NAME,
.nrxq = MAX_ULD_QSETS,
.ntxq = MAX_ULD_QSETS,
.rxq_size = 511,
.ciq = true,
.lro = false,
.add = c4iw_uld_add,
.rx_handler = c4iw_uld_rx_handler,
.state_change = c4iw_uld_state_change,
.control = c4iw_uld_control,
};
void _c4iw_free_wr_wait(struct kref *kref)
{
struct c4iw_wr_wait *wr_waitp;
wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
pr_debug("Free wr_wait %p\n", wr_waitp);
kfree(wr_waitp);
}
struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
{
struct c4iw_wr_wait *wr_waitp;
wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
if (wr_waitp) {
kref_init(&wr_waitp->kref);
pr_debug("wr_wait %p\n", wr_waitp);
}
return wr_waitp;
}
static int __init c4iw_init_module(void)
{
int err;
err = c4iw_cm_init();
if (err)
return err;
c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
reg_workq = create_singlethread_workqueue("Register_iWARP_device");
if (!reg_workq) {
pr_err("Failed creating workqueue to register iwarp device\n");
return -ENOMEM;
}
cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
return 0;
}
static void __exit c4iw_exit_module(void)
{
struct uld_ctx *ctx, *tmp;
mutex_lock(&dev_mutex);
list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
if (ctx->dev)
c4iw_remove(ctx);
kfree(ctx);
}
mutex_unlock(&dev_mutex);
destroy_workqueue(reg_workq);
cxgb4_unregister_uld(CXGB4_ULD_RDMA);
c4iw_cm_term();
debugfs_remove_recursive(c4iw_debugfs_root);
}
module_init(c4iw_init_module);
module_exit(c4iw_exit_module);
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