RDMA/cxgb4: Add driver for Chelsio T4 RNIC

Add an RDMA/iWARP driver for Chelsio T4 Ethernet adapters.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

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);