diff options
Diffstat (limited to 'drivers/infiniband/hw/cxgb4/device.c')
-rw-r--r-- | drivers/infiniband/hw/cxgb4/device.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c new file mode 100644 index 000000000000..be23b5eab13b --- /dev/null +++ b/drivers/infiniband/hw/cxgb4/device.c @@ -0,0 +1,520 @@ +/* + * 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 <rdma/ib_verbs.h> + +#include "iw_cxgb4.h" + +#define DRV_VERSION "0.1" + +MODULE_AUTHOR("Steve Wise"); +MODULE_DESCRIPTION("Chelsio T4 RDMA Driver"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(DRV_VERSION); + +static LIST_HEAD(dev_list); +static DEFINE_MUTEX(dev_mutex); + +static struct dentry *c4iw_debugfs_root; + +struct debugfs_qp_data { + struct c4iw_dev *devp; + char *buf; + int bufsize; + int pos; +}; + +static int count_qps(int id, void *p, void *data) +{ + struct c4iw_qp *qp = p; + int *countp = data; + + if (id != qp->wq.sq.qid) + return 0; + + *countp = *countp + 1; + return 0; +} + +static int dump_qps(int id, void *p, void *data) +{ + struct c4iw_qp *qp = p; + struct debugfs_qp_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) + cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u " + "ep tid %u state %u %pI4:%u->%pI4:%u\n", + qp->wq.sq.qid, (int)qp->attr.state, + qp->ep->hwtid, (int)qp->ep->com.state, + &qp->ep->com.local_addr.sin_addr.s_addr, + ntohs(qp->ep->com.local_addr.sin_port), + &qp->ep->com.remote_addr.sin_addr.s_addr, + ntohs(qp->ep->com.remote_addr.sin_port)); + else + cc = snprintf(qpd->buf + qpd->pos, space, "qp id %u state %u\n", + qp->wq.sq.qid, (int)qp->attr.state); + if (cc < space) + qpd->pos += cc; + return 0; +} + +static int qp_release(struct inode *inode, struct file *file) +{ + struct debugfs_qp_data *qpd = file->private_data; + if (!qpd) { + printk(KERN_INFO "%s null qpd?\n", __func__); + return 0; + } + kfree(qpd->buf); + kfree(qpd); + return 0; +} + +static int qp_open(struct inode *inode, struct file *file) +{ + struct debugfs_qp_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_qps, &count); + spin_unlock_irq(&qpd->devp->lock); + + qpd->bufsize = count * 128; + qpd->buf = kmalloc(qpd->bufsize, GFP_KERNEL); + if (!qpd->buf) { + ret = -ENOMEM; + goto err1; + } + + spin_lock_irq(&qpd->devp->lock); + idr_for_each(&qpd->devp->qpidr, dump_qps, 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 ssize_t qp_read(struct file *file, char __user *buf, size_t count, + loff_t *ppos) +{ + struct debugfs_qp_data *qpd = file->private_data; + loff_t pos = *ppos; + loff_t avail = qpd->pos; + + if (pos < 0) + return -EINVAL; + if (pos >= avail) + return 0; + if (count > avail - pos) + count = avail - pos; + + while (count) { + size_t len = 0; + + len = min((int)count, (int)qpd->pos - (int)pos); + if (copy_to_user(buf, qpd->buf + pos, len)) + return -EFAULT; + if (len == 0) + return -EINVAL; + + buf += len; + pos += len; + count -= len; + } + count = pos - *ppos; + *ppos = pos; + return count; +} + +static const struct file_operations qp_debugfs_fops = { + .owner = THIS_MODULE, + .open = qp_open, + .release = qp_release, + .read = qp_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; + 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_fifo, entry->qid, + &rdev->resource.qid_fifo_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\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); + PDBG("udb len 0x%x udb base %p 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), + (void *)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; + } + + 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; + } + return 0; +err3: + c4iw_pblpool_destroy(rdev); +err2: + c4iw_destroy_resource(&rdev->resource); +err1: + return err; +} + +static void c4iw_rdev_close(struct c4iw_rdev *rdev) +{ + c4iw_pblpool_destroy(rdev); + c4iw_rqtpool_destroy(rdev); + c4iw_destroy_resource(&rdev->resource); +} + +static void c4iw_remove(struct c4iw_dev *dev) +{ + PDBG("%s c4iw_dev %p\n", __func__, dev); + cancel_delayed_work_sync(&dev->db_drop_task); + list_del(&dev->entry); + c4iw_unregister_device(dev); + c4iw_rdev_close(&dev->rdev); + idr_destroy(&dev->cqidr); + idr_destroy(&dev->qpidr); + idr_destroy(&dev->mmidr); + ib_dealloc_device(&dev->ibdev); +} + +static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop) +{ + struct c4iw_dev *devp; + int ret; + + devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp)); + if (!devp) { + printk(KERN_ERR MOD "Cannot allocate ib device\n"); + return NULL; + } + devp->rdev.lldi = *infop; + + mutex_lock(&dev_mutex); + + ret = c4iw_rdev_open(&devp->rdev); + if (ret) { + mutex_unlock(&dev_mutex); + printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret); + ib_dealloc_device(&devp->ibdev); + return NULL; + } + + idr_init(&devp->cqidr); + idr_init(&devp->qpidr); + idr_init(&devp->mmidr); + spin_lock_init(&devp->lock); + list_add_tail(&devp->entry, &dev_list); + mutex_unlock(&dev_mutex); + + if (c4iw_register_device(devp)) { + printk(KERN_ERR MOD "Unable to register device\n"); + mutex_lock(&dev_mutex); + c4iw_remove(devp); + mutex_unlock(&dev_mutex); + } + 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 c4iw_dev *dev; + static int vers_printed; + int i; + + if (!vers_printed++) + printk(KERN_INFO MOD "Chelsio T4 RDMA Driver - version %s\n", + DRV_VERSION); + + dev = c4iw_alloc(infop); + if (!dev) + goto out; + + PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n", + __func__, pci_name(dev->rdev.lldi.pdev), + dev->rdev.lldi.nchan, dev->rdev.lldi.nrxq, + dev->rdev.lldi.ntxq, dev->rdev.lldi.nports); + + for (i = 0; i < dev->rdev.lldi.nrxq; i++) + PDBG("rxqid[%u] %u\n", i, dev->rdev.lldi.rxq_ids[i]); + + printk(KERN_INFO MOD "Initialized device %s\n", + pci_name(dev->rdev.lldi.pdev)); +out: + return dev; +} + +static struct sk_buff *t4_pktgl_to_skb(const struct pkt_gl *gl, + unsigned int skb_len, + unsigned int pull_len) +{ + struct sk_buff *skb; + struct skb_shared_info *ssi; + + if (gl->tot_len <= 512) { + skb = alloc_skb(gl->tot_len, GFP_ATOMIC); + if (unlikely(!skb)) + goto out; + __skb_put(skb, gl->tot_len); + skb_copy_to_linear_data(skb, gl->va, gl->tot_len); + } else { + skb = alloc_skb(skb_len, GFP_ATOMIC); + if (unlikely(!skb)) + goto out; + __skb_put(skb, pull_len); + skb_copy_to_linear_data(skb, gl->va, pull_len); + + ssi = skb_shinfo(skb); + ssi->frags[0].page = gl->frags[0].page; + ssi->frags[0].page_offset = gl->frags[0].page_offset + pull_len; + ssi->frags[0].size = gl->frags[0].size - pull_len; + if (gl->nfrags > 1) + memcpy(&ssi->frags[1], &gl->frags[1], + (gl->nfrags - 1) * sizeof(skb_frag_t)); + ssi->nr_frags = gl->nfrags; + + skb->len = gl->tot_len; + skb->data_len = skb->len - pull_len; + skb->truesize += skb->data_len; + + /* Get a reference for the last page, we don't own it */ + get_page(gl->frags[gl->nfrags - 1].page); + } +out: + return skb; +} + +static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp, + const struct pkt_gl *gl) +{ + struct c4iw_dev *dev = handle; + struct sk_buff *skb; + const struct cpl_act_establish *rpl; + unsigned int 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 { + skb = t4_pktgl_to_skb(gl, 128, 128); + if (unlikely(!skb)) + goto nomem; + } + + rpl = cplhdr(skb); + opcode = rpl->ot.opcode; + + if (c4iw_handlers[opcode]) + c4iw_handlers[opcode](dev, skb); + else + printk(KERN_INFO "%s no handler opcode 0x%x...\n", __func__, + opcode); + + return 0; +nomem: + return -1; +} + +static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state) +{ + PDBG("%s new_state %u\n", __func__, new_state); + 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, +}; + +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 c4iw_dev *dev, *tmp; + + cxgb4_unregister_uld(CXGB4_ULD_RDMA); + + mutex_lock(&dev_mutex); + list_for_each_entry_safe(dev, tmp, &dev_list, entry) { + c4iw_remove(dev); + } + mutex_unlock(&dev_mutex); + + c4iw_cm_term(); + debugfs_remove_recursive(c4iw_debugfs_root); +} + +module_init(c4iw_init_module); +module_exit(c4iw_exit_module); |