1 files changed, 376 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_mcg.c b/drivers/infiniband/hw/mthca/mthca_mcg.c
new file mode 100644
index 000000000000..70a6553a588e
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_mcg.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (c) 2004 Topspin Communications.  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.
+ *
+ * $Id: mthca_mcg.c 1349 2004-12-16 21:09:43Z roland $
+ */
+
+#include <linux/init.h>
+
+#include "mthca_dev.h"
+#include "mthca_cmd.h"
+
+enum {
+        MTHCA_QP_PER_MGM = 4 * (MTHCA_MGM_ENTRY_SIZE / 16 - 2)
+};
+
+struct mthca_mgm {
+        u32 next_gid_index;
+        u32 reserved[3];
+        u8  gid[16];
+        u32 qp[MTHCA_QP_PER_MGM];
+};
+
+static const u8 zero_gid[16];   /* automatically initialized to 0 */
+
+/*
+ * Caller must hold MCG table semaphore.  gid and mgm parameters must
+ * be properly aligned for command interface.
+ *
+ *  Returns 0 unless a firmware command error occurs.
+ *
+ * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
+ * and *mgm holds MGM entry.
+ *
+ * if GID is found in AMGM, *index = index in AMGM, *prev = index of
+ * previous entry in hash chain and *mgm holds AMGM entry.
+ *
+ * If no AMGM exists for given gid, *index = -1, *prev = index of last
+ * entry in hash chain and *mgm holds end of hash chain.
+ */
+static int find_mgm(struct mthca_dev *dev,
+                    u8 *gid, struct mthca_mgm *mgm,
+                    u16 *hash, int *prev, int *index)
+{
+        void *mailbox;
+        u8 *mgid;
+        int err;
+        u8 status;
+
+        mailbox = kmalloc(16 + MTHCA_CMD_MAILBOX_EXTRA, GFP_KERNEL);
+        if (!mailbox)
+                return -ENOMEM;
+        mgid = MAILBOX_ALIGN(mailbox);
+
+        memcpy(mgid, gid, 16);
+
+        err = mthca_MGID_HASH(dev, mgid, hash, &status);
+        if (err)
+                goto out;
+        if (status) {
+                mthca_err(dev, "MGID_HASH returned status %02x\n", status);
+                err = -EINVAL;
+                goto out;
+        }
+
+        if (0)
+                mthca_dbg(dev, "Hash for %04x:%04x:%04x:%04x:"
+                          "%04x:%04x:%04x:%04x is %04x\n",
+                          be16_to_cpu(((u16 *) gid)[0]), be16_to_cpu(((u16 *) gid)[1]),
+                          be16_to_cpu(((u16 *) gid)[2]), be16_to_cpu(((u16 *) gid)[3]),
+                          be16_to_cpu(((u16 *) gid)[4]), be16_to_cpu(((u16 *) gid)[5]),
+                          be16_to_cpu(((u16 *) gid)[6]), be16_to_cpu(((u16 *) gid)[7]),
+                          *hash);
+
+        *index = *hash;
+        *prev  = -1;
+
+        do {
+                err = mthca_READ_MGM(dev, *index, mgm, &status);
+                if (err)
+                        goto out;
+                if (status) {
+                        mthca_err(dev, "READ_MGM returned status %02x\n", status);
+                        return -EINVAL;
+                }
+
+                if (!memcmp(mgm->gid, zero_gid, 16)) {
+                        if (*index != *hash) {
+                                mthca_err(dev, "Found zero MGID in AMGM.\n");
+                                err = -EINVAL;
+                        }
+                        goto out;
+                }
+
+                if (!memcmp(mgm->gid, gid, 16))
+                        goto out;
+
+                *prev = *index;
+                *index = be32_to_cpu(mgm->next_gid_index) >> 5;
+        } while (*index);
+
+        *index = -1;
+
+ out:
+        kfree(mailbox);
+        return err;
+}
+
+int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
+{
+        struct mthca_dev *dev = to_mdev(ibqp->device);
+        void *mailbox;
+        struct mthca_mgm *mgm;
+        u16 hash;
+        int index, prev;
+        int link = 0;
+        int i;
+        int err;
+        u8 status;
+
+        mailbox = kmalloc(sizeof *mgm + MTHCA_CMD_MAILBOX_EXTRA, GFP_KERNEL);
+        if (!mailbox)
+                return -ENOMEM;
+        mgm = MAILBOX_ALIGN(mailbox);
+
+        if (down_interruptible(&dev->mcg_table.sem))
+                return -EINTR;
+
+        err = find_mgm(dev, gid->raw, mgm, &hash, &prev, &index);
+        if (err)
+                goto out;
+
+        if (index != -1) {
+                if (!memcmp(mgm->gid, zero_gid, 16))
+                        memcpy(mgm->gid, gid->raw, 16);
+        } else {
+                link = 1;
+
+                index = mthca_alloc(&dev->mcg_table.alloc);
+                if (index == -1) {
+                        mthca_err(dev, "No AMGM entries left\n");
+                        err = -ENOMEM;
+                        goto out;
+                }
+
+                err = mthca_READ_MGM(dev, index, mgm, &status);
+                if (err)
+                        goto out;
+                if (status) {
+                        mthca_err(dev, "READ_MGM returned status %02x\n", status);
+                        err = -EINVAL;
+                        goto out;
+                }
+
+                memcpy(mgm->gid, gid->raw, 16);
+                mgm->next_gid_index = 0;
+        }
+
+        for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
+                if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
+                        mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
+                        break;
+                }
+
+        if (i == MTHCA_QP_PER_MGM) {
+                mthca_err(dev, "MGM at index %x is full.\n", index);
+                err = -ENOMEM;
+                goto out;
+        }
+
+        err = mthca_WRITE_MGM(dev, index, mgm, &status);
+        if (err)
+                goto out;
+        if (status) {
+                mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
+                err = -EINVAL;
+        }
+
+        if (!link)
+                goto out;
+
+        err = mthca_READ_MGM(dev, prev, mgm, &status);
+        if (err)
+                goto out;
+        if (status) {
+                mthca_err(dev, "READ_MGM returned status %02x\n", status);
+                err = -EINVAL;
+                goto out;
+        }
+
+        mgm->next_gid_index = cpu_to_be32(index << 5);
+
+        err = mthca_WRITE_MGM(dev, prev, mgm, &status);
+        if (err)
+                goto out;
+        if (status) {
+                mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
+                err = -EINVAL;
+        }
+
+ out:
+        up(&dev->mcg_table.sem);
+        kfree(mailbox);
+        return err;
+}
+
+int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
+{
+        struct mthca_dev *dev = to_mdev(ibqp->device);
+        void *mailbox;
+        struct mthca_mgm *mgm;
+        u16 hash;
+        int prev, index;
+        int i, loc;
+        int err;
+        u8 status;
+
+        mailbox = kmalloc(sizeof *mgm + MTHCA_CMD_MAILBOX_EXTRA, GFP_KERNEL);
+        if (!mailbox)
+                return -ENOMEM;
+        mgm = MAILBOX_ALIGN(mailbox);
+
+        if (down_interruptible(&dev->mcg_table.sem))
+                return -EINTR;
+
+        err = find_mgm(dev, gid->raw, mgm, &hash, &prev, &index);
+        if (err)
+                goto out;
+
+        if (index == -1) {
+                mthca_err(dev, "MGID %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+                          "not found\n",
+                          be16_to_cpu(((u16 *) gid->raw)[0]),
+                          be16_to_cpu(((u16 *) gid->raw)[1]),
+                          be16_to_cpu(((u16 *) gid->raw)[2]),
+                          be16_to_cpu(((u16 *) gid->raw)[3]),
+                          be16_to_cpu(((u16 *) gid->raw)[4]),
+                          be16_to_cpu(((u16 *) gid->raw)[5]),
+                          be16_to_cpu(((u16 *) gid->raw)[6]),
+                          be16_to_cpu(((u16 *) gid->raw)[7]));
+                err = -EINVAL;
+                goto out;
+        }
+
+        for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
+                if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
+                        loc = i;
+                if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
+                        break;
+        }
+
+        if (loc == -1) {
+                mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
+                err = -EINVAL;
+                goto out;
+        }
+
+        mgm->qp[loc]   = mgm->qp[i - 1];
+        mgm->qp[i - 1] = 0;
+
+        err = mthca_WRITE_MGM(dev, index, mgm, &status);
+        if (err)
+                goto out;
+        if (status) {
+                mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
+                err = -EINVAL;
+                goto out;
+        }
+
+        if (i != 1)
+                goto out;
+
+        goto out;
+
+        if (prev == -1) {
+                /* Remove entry from MGM */
+                if (be32_to_cpu(mgm->next_gid_index) >> 5) {
+                        err = mthca_READ_MGM(dev,
+                                             be32_to_cpu(mgm->next_gid_index) >> 5,
+                                             mgm, &status);
+                        if (err)
+                                goto out;
+                        if (status) {
+                                mthca_err(dev, "READ_MGM returned status %02x\n",
+                                          status);
+                                err = -EINVAL;
+                                goto out;
+                        }
+                } else
+                        memset(mgm->gid, 0, 16);
+
+                err = mthca_WRITE_MGM(dev, index, mgm, &status);
+                if (err)
+                        goto out;
+                if (status) {
+                        mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
+                        err = -EINVAL;
+                        goto out;
+                }
+        } else {
+                /* Remove entry from AMGM */
+                index = be32_to_cpu(mgm->next_gid_index) >> 5;
+                err = mthca_READ_MGM(dev, prev, mgm, &status);
+                if (err)
+                        goto out;
+                if (status) {
+                        mthca_err(dev, "READ_MGM returned status %02x\n", status);
+                        err = -EINVAL;
+                        goto out;
+                }
+
+                mgm->next_gid_index = cpu_to_be32(index << 5);
+
+                err = mthca_WRITE_MGM(dev, prev, mgm, &status);
+                if (err)
+                        goto out;
+                if (status) {
+                        mthca_err(dev, "WRITE_MGM returned status %02x\n", status);
+                        err = -EINVAL;
+                        goto out;
+                }
+        }
+
+ out:
+        up(&dev->mcg_table.sem);
+        kfree(mailbox);
+        return err;
+}
+
+int __devinit mthca_init_mcg_table(struct mthca_dev *dev)
+{
+        int err;
+
+        err = mthca_alloc_init(&dev->mcg_table.alloc,
+                               dev->limits.num_amgms,
+                               dev->limits.num_amgms - 1,
+                               0);
+        if (err)
+                return err;
+
+        init_MUTEX(&dev->mcg_table.sem);
+
+        return 0;
+}
+
+void __devexit mthca_cleanup_mcg_table(struct mthca_dev *dev)
+{
+        mthca_alloc_cleanup(&dev->mcg_table.alloc);
+}