mlx5: Add driver for Mellanox Connect-IB adapters
The driver is comprised of two kernel modules: mlx5_ib and mlx5_core.
This partitioning resembles what we have for mlx4, except that mlx5_ib
is the pci device driver and not mlx5_core.
mlx5_core is essentially a library that provides general functionality
that is intended to be used by other Mellanox devices that will be
introduced in the future. mlx5_ib has a similar role as any hardware
device under drivers/infiniband/hw.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
[ Merge in coccinelle fixes from Fengguang Wu <fengguang.wu@intel.com>.
- Roland ]
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/mlx5/srq.c b/drivers/infiniband/hw/mlx5/srq.c
new file mode 100644
index 0000000..84d297a
--- /dev/null
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -0,0 +1,473 @@
+/*
+ * Copyright (c) 2013, Mellanox Technologies 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/mlx5/qp.h>
+#include <linux/mlx5/srq.h>
+#include <linux/slab.h>
+#include <rdma/ib_umem.h>
+
+#include "mlx5_ib.h"
+#include "user.h"
+
+/* not supported currently */
+static int srq_signature;
+
+static void *get_wqe(struct mlx5_ib_srq *srq, int n)
+{
+ return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
+}
+
+static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
+{
+ struct ib_event event;
+ struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
+
+ if (ibsrq->event_handler) {
+ event.device = ibsrq->device;
+ event.element.srq = ibsrq;
+ switch (type) {
+ case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
+ event.event = IB_EVENT_SRQ_LIMIT_REACHED;
+ break;
+ case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
+ event.event = IB_EVENT_SRQ_ERR;
+ break;
+ default:
+ pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
+ type, srq->srqn);
+ return;
+ }
+
+ ibsrq->event_handler(&event, ibsrq->srq_context);
+ }
+}
+
+static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
+ struct mlx5_create_srq_mbox_in **in,
+ struct ib_udata *udata, int buf_size, int *inlen)
+{
+ struct mlx5_ib_dev *dev = to_mdev(pd->device);
+ struct mlx5_ib_create_srq ucmd;
+ int err;
+ int npages;
+ int page_shift;
+ int ncont;
+ u32 offset;
+
+ if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
+ mlx5_ib_dbg(dev, "failed copy udata\n");
+ return -EFAULT;
+ }
+ srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
+
+ srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
+ 0, 0);
+ if (IS_ERR(srq->umem)) {
+ mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
+ err = PTR_ERR(srq->umem);
+ return err;
+ }
+
+ mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
+ &page_shift, &ncont, NULL);
+ err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
+ &offset);
+ if (err) {
+ mlx5_ib_warn(dev, "bad offset\n");
+ goto err_umem;
+ }
+
+ *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
+ *in = mlx5_vzalloc(*inlen);
+ if (!(*in)) {
+ err = -ENOMEM;
+ goto err_umem;
+ }
+
+ mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
+
+ err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
+ ucmd.db_addr, &srq->db);
+ if (err) {
+ mlx5_ib_dbg(dev, "map doorbell failed\n");
+ goto err_in;
+ }
+
+ (*in)->ctx.log_pg_sz = page_shift - PAGE_SHIFT;
+ (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
+
+ return 0;
+
+err_in:
+ mlx5_vfree(*in);
+
+err_umem:
+ ib_umem_release(srq->umem);
+
+ return err;
+}
+
+static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
+ struct mlx5_create_srq_mbox_in **in, int buf_size,
+ int *inlen)
+{
+ int err;
+ int i;
+ struct mlx5_wqe_srq_next_seg *next;
+ int page_shift;
+ int npages;
+
+ err = mlx5_db_alloc(&dev->mdev, &srq->db);
+ if (err) {
+ mlx5_ib_warn(dev, "alloc dbell rec failed\n");
+ return err;
+ }
+
+ *srq->db.db = 0;
+
+ if (mlx5_buf_alloc(&dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
+ mlx5_ib_dbg(dev, "buf alloc failed\n");
+ err = -ENOMEM;
+ goto err_db;
+ }
+ page_shift = srq->buf.page_shift;
+
+ srq->head = 0;
+ srq->tail = srq->msrq.max - 1;
+ srq->wqe_ctr = 0;
+
+ for (i = 0; i < srq->msrq.max; i++) {
+ next = get_wqe(srq, i);
+ next->next_wqe_index =
+ cpu_to_be16((i + 1) & (srq->msrq.max - 1));
+ }
+
+ npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
+ mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
+ buf_size, page_shift, srq->buf.npages, npages);
+ *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
+ *in = mlx5_vzalloc(*inlen);
+ if (!*in) {
+ err = -ENOMEM;
+ goto err_buf;
+ }
+ mlx5_fill_page_array(&srq->buf, (*in)->pas);
+
+ srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
+ if (!srq->wrid) {
+ mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
+ (unsigned long)(srq->msrq.max * sizeof(u64)));
+ err = -ENOMEM;
+ goto err_in;
+ }
+ srq->wq_sig = !!srq_signature;
+
+ (*in)->ctx.log_pg_sz = page_shift - PAGE_SHIFT;
+
+ return 0;
+
+err_in:
+ mlx5_vfree(*in);
+
+err_buf:
+ mlx5_buf_free(&dev->mdev, &srq->buf);
+
+err_db:
+ mlx5_db_free(&dev->mdev, &srq->db);
+ return err;
+}
+
+static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
+{
+ mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
+ ib_umem_release(srq->umem);
+}
+
+
+static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
+{
+ kfree(srq->wrid);
+ mlx5_buf_free(&dev->mdev, &srq->buf);
+ mlx5_db_free(&dev->mdev, &srq->db);
+}
+
+struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
+ struct ib_srq_init_attr *init_attr,
+ struct ib_udata *udata)
+{
+ struct mlx5_ib_dev *dev = to_mdev(pd->device);
+ struct mlx5_ib_srq *srq;
+ int desc_size;
+ int buf_size;
+ int err;
+ struct mlx5_create_srq_mbox_in *uninitialized_var(in);
+ int uninitialized_var(inlen);
+ int is_xrc;
+ u32 flgs, xrcdn;
+
+ /* Sanity check SRQ size before proceeding */
+ if (init_attr->attr.max_wr >= dev->mdev.caps.max_srq_wqes) {
+ mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
+ init_attr->attr.max_wr,
+ dev->mdev.caps.max_srq_wqes);
+ return ERR_PTR(-EINVAL);
+ }
+
+ srq = kmalloc(sizeof(*srq), GFP_KERNEL);
+ if (!srq)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&srq->mutex);
+ spin_lock_init(&srq->lock);
+ srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
+ srq->msrq.max_gs = init_attr->attr.max_sge;
+
+ desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
+ srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
+ desc_size = roundup_pow_of_two(desc_size);
+ desc_size = max_t(int, 32, desc_size);
+ srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
+ sizeof(struct mlx5_wqe_data_seg);
+ srq->msrq.wqe_shift = ilog2(desc_size);
+ buf_size = srq->msrq.max * desc_size;
+ mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n",
+ desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
+ srq->msrq.max_avail_gather);
+
+ if (pd->uobject)
+ err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
+ else
+ err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);
+
+ if (err) {
+ mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
+ pd->uobject ? "user" : "kernel", err);
+ goto err_srq;
+ }
+
+ is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
+ in->ctx.state_log_sz = ilog2(srq->msrq.max);
+ flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
+ xrcdn = 0;
+ if (is_xrc) {
+ xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
+ in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
+ } else if (init_attr->srq_type == IB_SRQT_BASIC) {
+ xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
+ in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
+ }
+
+ in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
+
+ in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
+ in->ctx.db_record = cpu_to_be64(srq->db.dma);
+ err = mlx5_core_create_srq(&dev->mdev, &srq->msrq, in, inlen);
+ mlx5_vfree(in);
+ if (err) {
+ mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
+ goto err_srq;
+ }
+
+ mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
+
+ srq->msrq.event = mlx5_ib_srq_event;
+ srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
+
+ if (pd->uobject)
+ if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
+ mlx5_ib_dbg(dev, "copy to user failed\n");
+ err = -EFAULT;
+ goto err_core;
+ }
+
+ init_attr->attr.max_wr = srq->msrq.max - 1;
+
+ return &srq->ibsrq;
+
+err_core:
+ mlx5_core_destroy_srq(&dev->mdev, &srq->msrq);
+ if (pd->uobject)
+ destroy_srq_user(pd, srq);
+ else
+ destroy_srq_kernel(dev, srq);
+
+err_srq:
+ kfree(srq);
+
+ return ERR_PTR(err);
+}
+
+int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
+ enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
+{
+ struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
+ struct mlx5_ib_srq *srq = to_msrq(ibsrq);
+ int ret;
+
+ /* We don't support resizing SRQs yet */
+ if (attr_mask & IB_SRQ_MAX_WR)
+ return -EINVAL;
+
+ if (attr_mask & IB_SRQ_LIMIT) {
+ if (attr->srq_limit >= srq->msrq.max)
+ return -EINVAL;
+
+ mutex_lock(&srq->mutex);
+ ret = mlx5_core_arm_srq(&dev->mdev, &srq->msrq, attr->srq_limit, 1);
+ mutex_unlock(&srq->mutex);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
+{
+ struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
+ struct mlx5_ib_srq *srq = to_msrq(ibsrq);
+ int ret;
+ struct mlx5_query_srq_mbox_out *out;
+
+ out = kzalloc(sizeof(*out), GFP_KERNEL);
+ if (!out)
+ return -ENOMEM;
+
+ ret = mlx5_core_query_srq(&dev->mdev, &srq->msrq, out);
+ if (ret)
+ goto out_box;
+
+ srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
+ srq_attr->max_wr = srq->msrq.max - 1;
+ srq_attr->max_sge = srq->msrq.max_gs;
+
+out_box:
+ kfree(out);
+ return ret;
+}
+
+int mlx5_ib_destroy_srq(struct ib_srq *srq)
+{
+ struct mlx5_ib_dev *dev = to_mdev(srq->device);
+ struct mlx5_ib_srq *msrq = to_msrq(srq);
+
+ mlx5_core_destroy_srq(&dev->mdev, &msrq->msrq);
+
+ if (srq->uobject) {
+ mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
+ ib_umem_release(msrq->umem);
+ } else {
+ kfree(msrq->wrid);
+ mlx5_buf_free(&dev->mdev, &msrq->buf);
+ mlx5_db_free(&dev->mdev, &msrq->db);
+ }
+
+ kfree(srq);
+ return 0;
+}
+
+void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
+{
+ struct mlx5_wqe_srq_next_seg *next;
+
+ /* always called with interrupts disabled. */
+ spin_lock(&srq->lock);
+
+ next = get_wqe(srq, srq->tail);
+ next->next_wqe_index = cpu_to_be16(wqe_index);
+ srq->tail = wqe_index;
+
+ spin_unlock(&srq->lock);
+}
+
+int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
+ struct ib_recv_wr **bad_wr)
+{
+ struct mlx5_ib_srq *srq = to_msrq(ibsrq);
+ struct mlx5_wqe_srq_next_seg *next;
+ struct mlx5_wqe_data_seg *scat;
+ unsigned long flags;
+ int err = 0;
+ int nreq;
+ int i;
+
+ spin_lock_irqsave(&srq->lock, flags);
+
+ for (nreq = 0; wr; nreq++, wr = wr->next) {
+ if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
+ err = -EINVAL;
+ *bad_wr = wr;
+ break;
+ }
+
+ if (unlikely(srq->head == srq->tail)) {
+ err = -ENOMEM;
+ *bad_wr = wr;
+ break;
+ }
+
+ srq->wrid[srq->head] = wr->wr_id;
+
+ next = get_wqe(srq, srq->head);
+ srq->head = be16_to_cpu(next->next_wqe_index);
+ scat = (struct mlx5_wqe_data_seg *)(next + 1);
+
+ for (i = 0; i < wr->num_sge; i++) {
+ scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
+ scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
+ scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
+ }
+
+ if (i < srq->msrq.max_avail_gather) {
+ scat[i].byte_count = 0;
+ scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY);
+ scat[i].addr = 0;
+ }
+ }
+
+ if (likely(nreq)) {
+ srq->wqe_ctr += nreq;
+
+ /* Make sure that descriptors are written before
+ * doorbell record.
+ */
+ wmb();
+
+ *srq->db.db = cpu_to_be32(srq->wqe_ctr);
+ }
+
+ spin_unlock_irqrestore(&srq->lock, flags);
+
+ return err;
+}