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OpenCloudOS-Kernel/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 <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");
MODULE_VERSION(DRV_VERSION);
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)");
struct uld_ctx {
struct list_head entry;
struct cxgb4_lld_info lldi;
struct c4iw_dev *dev;
};
static LIST_HEAD(uld_ctx_list);
static DEFINE_MUTEX(dev_mutex);
#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 int count_idrs(int id, void *p, void *data)
{
int *countp = data;
*countp = *countp + 1;
return 0;
}
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);
}
static int dump_qp(int id, void *p, void *data)
{
struct c4iw_qp *qp = p;
struct c4iw_debugfs_data *qpd = data;
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) {
if (qp->ep->com.local_addr.ss_family == AF_INET) {
struct sockaddr_in *lsin = (struct sockaddr_in *)
&qp->ep->com.local_addr;
struct sockaddr_in *rsin = (struct sockaddr_in *)
&qp->ep->com.remote_addr;
cc = snprintf(qpd->buf + qpd->pos, space,
"rc qp sq id %u rq id %u state %u "
"onchip %u ep tid %u state %u "
"%pI4:%u->%pI4:%u\n",
qp->wq.sq.qid, qp->wq.rq.qid,
(int)qp->attr.state,
qp->wq.sq.flags & T4_SQ_ONCHIP,
qp->ep->hwtid, (int)qp->ep->com.state,
&lsin->sin_addr, ntohs(lsin->sin_port),
&rsin->sin_addr, ntohs(rsin->sin_port));
} else {
struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
&qp->ep->com.local_addr;
struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
&qp->ep->com.remote_addr;
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->%pI6:%u\n",
qp->wq.sq.qid, qp->wq.rq.qid,
(int)qp->attr.state,
qp->wq.sq.flags & T4_SQ_ONCHIP,
qp->ep->hwtid, (int)qp->ep->com.state,
&lsin6->sin6_addr,
ntohs(lsin6->sin6_port),
&rsin6->sin6_addr,
ntohs(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) {
printk(KERN_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_debugfs_data *qpd;
int ret = 0;
int count = 1;
qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
if (!qpd) {
ret = -ENOMEM;
goto out;
}
qpd->devp = inode->i_private;
qpd->pos = 0;
spin_lock_irq(&qpd->devp->lock);
idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
spin_unlock_irq(&qpd->devp->lock);
qpd->bufsize = count * 128;
qpd->buf = vmalloc(qpd->bufsize);
if (!qpd->buf) {
ret = -ENOMEM;
goto err1;
}
spin_lock_irq(&qpd->devp->lock);
idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
spin_unlock_irq(&qpd->devp->lock);
qpd->buf[qpd->pos++] = 0;
file->private_data = qpd;
goto out;
err1:
kfree(qpd);
out:
return ret;
}
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(int id, void *p, void *data)
{
struct c4iw_debugfs_data *stagd = data;
int space;
int cc;
space = stagd->bufsize - stagd->pos - 1;
if (space == 0)
return 1;
cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
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) {
printk(KERN_INFO "%s null stagd?\n", __func__);
return 0;
}
kfree(stagd->buf);
kfree(stagd);
return 0;
}
static int stag_open(struct inode *inode, struct file *file)
{
struct c4iw_debugfs_data *stagd;
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;
spin_lock_irq(&stagd->devp->lock);
idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
spin_unlock_irq(&stagd->devp->lock);
stagd->bufsize = count * sizeof("0x12345678\n");
stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
if (!stagd->buf) {
ret = -ENOMEM;
goto err1;
}
spin_lock_irq(&stagd->devp->lock);
idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
spin_unlock_irq(&stagd->devp->lock);
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, " 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);
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.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(int id, void *p, void *data)
{
struct c4iw_ep *ep = p;
struct c4iw_debugfs_data *epd = data;
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.local_addr;
struct sockaddr_in *rsin = (struct sockaddr_in *)
&ep->com.remote_addr;
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 "
"%pI4:%d <-> %pI4:%d\n",
ep, ep->com.cm_id, ep->com.qp,
(int)ep->com.state, ep->com.flags,
ep->com.history, ep->hwtid, ep->atid,
&lsin->sin_addr, ntohs(lsin->sin_port),
&rsin->sin_addr, ntohs(rsin->sin_port));
} else {
struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
&ep->com.local_addr;
struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
&ep->com.remote_addr;
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 "
"%pI6:%d <-> %pI6:%d\n",
ep, ep->com.cm_id, ep->com.qp,
(int)ep->com.state, ep->com.flags,
ep->com.history, ep->hwtid, ep->atid,
&lsin6->sin6_addr, ntohs(lsin6->sin6_port),
&rsin6->sin6_addr, ntohs(rsin6->sin6_port));
}
if (cc < space)
epd->pos += cc;
return 0;
}
static int dump_listen_ep(int id, void *p, void *data)
{
struct c4iw_listen_ep *ep = p;
struct c4iw_debugfs_data *epd = data;
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.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\n",
ep, ep->com.cm_id, (int)ep->com.state,
ep->com.flags, ep->stid, ep->backlog,
&lsin->sin_addr, ntohs(lsin->sin_port));
} else {
struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
&ep->com.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\n",
ep, ep->com.cm_id, (int)ep->com.state,
ep->com.flags, ep->stid, ep->backlog,
&lsin6->sin6_addr, ntohs(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_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;
spin_lock_irq(&epd->devp->lock);
idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
spin_unlock_irq(&epd->devp->lock);
epd->bufsize = count * 160;
epd->buf = vmalloc(epd->bufsize);
if (!epd->buf) {
ret = -ENOMEM;
goto err1;
}
spin_lock_irq(&epd->devp->lock);
idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
spin_unlock_irq(&epd->devp->lock);
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 int setup_debugfs(struct c4iw_dev *devp)
{
struct dentry *de;
if (!devp->debugfs_root)
return -1;
de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
(void *)devp, &qp_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
(void *)devp, &stag_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
(void *)devp, &stats_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
(void *)devp, &ep_debugfs_fops);
if (de && de->d_inode)
de->d_inode->i_size = 4096;
return 0;
}
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->qpids) {
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;
c4iw_init_dev_ucontext(rdev, &rdev->uctx);
/*
* qpshift is the number of bits to shift the qpid left in order
* to get the correct address of the doorbell for that qp.
*/
rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
rdev->qpmask = rdev->lldi.udb_density - 1;
rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
rdev->cqmask = rdev->lldi.ucq_density - 1;
PDBG("%s 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\n",
__func__, 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);
PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
"qpmask 0x%x cqshift %lu cqmask 0x%x\n",
(unsigned)pci_resource_len(rdev->lldi.pdev, 2),
(u64)pci_resource_start(rdev->lldi.pdev, 2),
rdev->lldi.db_reg,
rdev->lldi.gts_reg,
rdev->qpshift, rdev->qpmask,
rdev->cqshift, rdev->cqmask);
if (c4iw_num_stags(rdev) == 0) {
err = -EINVAL;
goto err1;
}
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.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);
if (err) {
printk(KERN_ERR MOD "error %d initializing resources\n", err);
goto err1;
}
err = c4iw_pblpool_create(rdev);
if (err) {
printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
goto err2;
}
err = c4iw_rqtpool_create(rdev);
if (err) {
printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
goto err3;
}
err = c4iw_ocqp_pool_create(rdev);
if (err) {
printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
goto err4;
}
rdev->status_page = (struct t4_dev_status_page *)
__get_free_page(GFP_KERNEL);
if (!rdev->status_page) {
pr_err(MOD "error allocating status page\n");
goto err4;
}
return 0;
err4:
c4iw_rqtpool_destroy(rdev);
err3:
c4iw_pblpool_destroy(rdev);
err2:
c4iw_destroy_resource(&rdev->resource);
err1:
return err;
}
static void c4iw_rdev_close(struct c4iw_rdev *rdev)
{
free_page((unsigned long)rdev->status_page);
c4iw_pblpool_destroy(rdev);
c4iw_rqtpool_destroy(rdev);
c4iw_destroy_resource(&rdev->resource);
}
static void c4iw_dealloc(struct uld_ctx *ctx)
{
c4iw_rdev_close(&ctx->dev->rdev);
idr_destroy(&ctx->dev->cqidr);
idr_destroy(&ctx->dev->qpidr);
idr_destroy(&ctx->dev->mmidr);
idr_destroy(&ctx->dev->hwtid_idr);
idr_destroy(&ctx->dev->stid_idr);
idr_destroy(&ctx->dev->atid_idr);
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)
{
PDBG("%s c4iw_dev %p\n", __func__, ctx->dev);
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)) {
printk(KERN_INFO MOD "%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 = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
if (!devp) {
printk(KERN_ERR MOD "Cannot allocate ib device\n");
return ERR_PTR(-ENOMEM);
}
devp->rdev.lldi = *infop;
/*
* For T5 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_t5(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(MOD "Unable to ioremap BAR2\n");
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(MOD "Unable to ioremap onchip mem\n");
return ERR_PTR(-EINVAL);
}
}
PDBG(KERN_INFO MOD "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) {
printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
ib_dealloc_device(&devp->ibdev);
return ERR_PTR(ret);
}
idr_init(&devp->cqidr);
idr_init(&devp->qpidr);
idr_init(&devp->mmidr);
idr_init(&devp->hwtid_idr);
idr_init(&devp->stid_idr);
idr_init(&devp->atid_idr);
spin_lock_init(&devp->lock);
mutex_init(&devp->rdev.stats.lock);
mutex_init(&devp->db_mutex);
INIT_LIST_HEAD(&devp->db_fc_list);
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;
PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
__func__, 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++)
PDBG("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,
(unsigned long long)be64_to_cpu(*rsp),
(unsigned long long)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;
PDBG("%s new_state %u\n", __func__, new_state);
switch (new_state) {
case CXGB4_STATE_UP:
printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
if (!ctx->dev) {
int ret;
ctx->dev = c4iw_alloc(&ctx->lldi);
if (IS_ERR(ctx->dev)) {
printk(KERN_ERR MOD
"%s: initialization failed: %ld\n",
pci_name(ctx->lldi.pdev),
PTR_ERR(ctx->dev));
ctx->dev = NULL;
break;
}
ret = c4iw_register_device(ctx->dev);
if (ret) {
printk(KERN_ERR MOD
"%s: RDMA registration failed: %d\n",
pci_name(ctx->lldi.pdev), ret);
c4iw_dealloc(ctx);
}
}
break;
case CXGB4_STATE_DOWN:
printk(KERN_INFO MOD "%s: Down\n",
pci_name(ctx->lldi.pdev));
if (ctx->dev)
c4iw_remove(ctx);
break;
case CXGB4_STATE_START_RECOVERY:
printk(KERN_INFO MOD "%s: Fatal Error\n",
pci_name(ctx->lldi.pdev));
if (ctx->dev) {
struct ib_event event;
ctx->dev->rdev.flags |= T4_FATAL_ERROR;
memset(&event, 0, sizeof event);
event.event = IB_EVENT_DEVICE_FATAL;
event.device = &ctx->dev->ibdev;
ib_dispatch_event(&event);
c4iw_remove(ctx);
}
break;
case CXGB4_STATE_DETACH:
printk(KERN_INFO MOD "%s: Detach\n",
pci_name(ctx->lldi.pdev));
if (ctx->dev)
c4iw_remove(ctx);
break;
}
return 0;
}
static int disable_qp_db(int id, void *p, void *data)
{
struct c4iw_qp *qp = p;
t4_disable_wq_db(&qp->wq);
return 0;
}
static void stop_queues(struct uld_ctx *ctx)
{
unsigned long flags;
spin_lock_irqsave(&ctx->dev->lock, flags);
ctx->dev->rdev.stats.db_state_transitions++;
ctx->dev->db_state = STOPPED;
if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
else
ctx->dev->rdev.status_page->db_off = 1;
spin_unlock_irqrestore(&ctx->dev->lock, flags);
}
static int enable_qp_db(int id, void *p, void *data)
{
struct c4iw_qp *qp = p;
t4_enable_wq_db(&qp->wq);
return 0;
}
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,
is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
qp->wq.sq.wq_pidx_inc = 0;
t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
is_t5(qp->rhp->rdev.lldi.adapter_type), 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)
{
spin_lock_irq(&ctx->dev->lock);
if (ctx->dev->db_state != STOPPED)
goto out;
ctx->dev->db_state = FLOW_CONTROL;
while (1) {
if (list_empty(&ctx->dev->db_fc_list)) {
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) {
idr_for_each(&ctx->dev->qpidr, enable_qp_db,
NULL);
} 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)) {
spin_unlock_irq(&ctx->dev->lock);
if (DB_FC_RESUME_DELAY) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(DB_FC_RESUME_DELAY);
}
spin_lock_irq(&ctx->dev->lock);
if (ctx->dev->db_state != FLOW_CONTROL)
break;
}
}
}
out:
if (ctx->dev->db_state != NORMAL)
ctx->dev->rdev.stats.db_fc_interruptions++;
spin_unlock_irq(&ctx->dev->lock);
}
struct qp_list {
unsigned idx;
struct c4iw_qp **qps;
};
static int add_and_ref_qp(int id, void *p, void *data)
{
struct qp_list *qp_listp = data;
struct c4iw_qp *qp = p;
c4iw_qp_add_ref(&qp->ibqp);
qp_listp->qps[qp_listp->idx++] = qp;
return 0;
}
static int count_qps(int id, void *p, void *data)
{
unsigned *countp = data;
(*countp)++;
return 0;
}
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];
spin_lock_irq(&qp->rhp->lock);
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(KERN_ERR MOD "%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);
spin_unlock_irq(&qp->rhp->lock);
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(KERN_ERR MOD "%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);
spin_unlock_irq(&qp->rhp->lock);
return;
}
qp->wq.rq.wq_pidx_inc = 0;
spin_unlock(&qp->lock);
spin_unlock_irq(&qp->rhp->lock);
/* 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)
{
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) {
printk(KERN_ERR MOD "%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 */
spin_lock_irq(&ctx->dev->lock);
WARN_ON(ctx->dev->db_state != STOPPED);
ctx->dev->db_state = RECOVERY;
idr_for_each(&ctx->dev->qpidr, count_qps, &count);
qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
if (!qp_list.qps) {
printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
pci_name(ctx->lldi.pdev));
spin_unlock_irq(&ctx->dev->lock);
return;
}
qp_list.idx = 0;
/* add and ref each qp so it doesn't get freed */
idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
spin_unlock_irq(&ctx->dev->lock);
/* 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);
spin_lock_irq(&ctx->dev->lock);
WARN_ON(ctx->dev->db_state != RECOVERY);
ctx->dev->db_state = STOPPED;
spin_unlock_irq(&ctx->dev->lock);
}
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:
printk(KERN_WARNING MOD "%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,
.add = c4iw_uld_add,
.rx_handler = c4iw_uld_rx_handler,
.state_change = c4iw_uld_state_change,
.control = c4iw_uld_control,
};
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);
if (!c4iw_debugfs_root)
printk(KERN_WARNING MOD
"could not create debugfs entry, continuing\n");
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);
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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