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authorArtemy Kovalyov <artemyko@mellanox.com>2017-04-05 09:23:59 +0300
committerDoug Ledford <dledford@redhat.com>2017-04-25 15:40:28 -0400
commitdb570d7deafb47ee635981f403a6531844c18ba5 (patch)
treea7a9f824a0a9e6b6786fcddfe7aea32227c5bc31
parent1b7dbc26fcb4822787d6a183d78384a866508d2f (diff)
IB/mlx5: Add ODP support to MW
Internally MW implemented as KLM MKey and filled by userspace UMR postsends. Handle pagefault trigered by operations on this MKeys. Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
-rw-r--r--drivers/infiniband/hw/mlx5/mlx5_ib.h1
-rw-r--r--drivers/infiniband/hw/mlx5/mr.c1
-rw-r--r--drivers/infiniband/hw/mlx5/odp.c161
3 files changed, 120 insertions, 43 deletions
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 191b82b038d7..93c646691208 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -513,6 +513,7 @@ struct mlx5_ib_mr {
struct mlx5_ib_mw {
struct ib_mw ibmw;
struct mlx5_core_mkey mmkey;
+ int ndescs;
};
struct mlx5_ib_umr_context {
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 9a74260e9899..93c0e82aa491 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1688,6 +1688,7 @@ struct ib_mw *mlx5_ib_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
mw->mmkey.type = MLX5_MKEY_MW;
mw->ibmw.rkey = mw->mmkey.key;
+ mw->ndescs = ndescs;
resp.response_length = min(offsetof(typeof(resp), response_length) +
sizeof(resp.response_length), udata->outlen);
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 842e1dbb50b8..ae0746754008 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -288,24 +288,6 @@ void mlx5_ib_internal_fill_odp_caps(struct mlx5_ib_dev *dev)
return;
}
-static struct mlx5_ib_mr *mlx5_ib_odp_find_mr_lkey(struct mlx5_ib_dev *dev,
- u32 key)
-{
- u32 base_key = mlx5_base_mkey(key);
- struct mlx5_core_mkey *mmkey = __mlx5_mr_lookup(dev->mdev, base_key);
- struct mlx5_ib_mr *mr;
-
- if (!mmkey || mmkey->key != key || mmkey->type != MLX5_MKEY_MR)
- return NULL;
-
- mr = container_of(mmkey, struct mlx5_ib_mr, mmkey);
-
- if (!mr->live)
- return NULL;
-
- return container_of(mmkey, struct mlx5_ib_mr, mmkey);
-}
-
static void mlx5_ib_page_fault_resume(struct mlx5_ib_dev *dev,
struct mlx5_pagefault *pfault,
int error)
@@ -625,6 +607,14 @@ out:
return ret;
}
+struct pf_frame {
+ struct pf_frame *next;
+ u32 key;
+ u64 io_virt;
+ size_t bcnt;
+ int depth;
+};
+
/*
* Handle a single data segment in a page-fault WQE or RDMA region.
*
@@ -641,43 +631,128 @@ static int pagefault_single_data_segment(struct mlx5_ib_dev *dev,
u32 *bytes_committed,
u32 *bytes_mapped)
{
- int npages = 0, srcu_key, ret;
+ int npages = 0, srcu_key, ret, i, outlen, cur_outlen = 0, depth = 0;
+ struct pf_frame *head = NULL, *frame;
+ struct mlx5_core_mkey *mmkey;
+ struct mlx5_ib_mw *mw;
struct mlx5_ib_mr *mr;
- size_t size;
+ struct mlx5_klm *pklm;
+ u32 *out = NULL;
+ size_t offset;
srcu_key = srcu_read_lock(&dev->mr_srcu);
- mr = mlx5_ib_odp_find_mr_lkey(dev, key);
- /*
- * If we didn't find the MR, it means the MR was closed while we were
- * handling the ODP event. In this case we return -EFAULT so that the
- * QP will be closed.
- */
- if (!mr || !mr->ibmr.pd) {
- mlx5_ib_dbg(dev, "Failed to find relevant mr for lkey=0x%06x, probably the MR was destroyed\n",
- key);
+
+ io_virt += *bytes_committed;
+ bcnt -= *bytes_committed;
+
+next_mr:
+ mmkey = __mlx5_mr_lookup(dev->mdev, mlx5_base_mkey(key));
+ if (!mmkey || mmkey->key != key) {
+ mlx5_ib_dbg(dev, "failed to find mkey %x\n", key);
ret = -EFAULT;
goto srcu_unlock;
}
- if (!mr->umem->odp_data) {
- mlx5_ib_dbg(dev, "skipping non ODP MR (lkey=0x%06x) in page fault handler.\n",
- key);
- if (bytes_mapped)
- *bytes_mapped +=
- (bcnt - *bytes_committed);
+
+ switch (mmkey->type) {
+ case MLX5_MKEY_MR:
+ mr = container_of(mmkey, struct mlx5_ib_mr, mmkey);
+ if (!mr->live || !mr->ibmr.pd) {
+ mlx5_ib_dbg(dev, "got dead MR\n");
+ ret = -EFAULT;
+ goto srcu_unlock;
+ }
+
+ ret = pagefault_mr(dev, mr, io_virt, bcnt, bytes_mapped);
+ if (ret < 0)
+ goto srcu_unlock;
+
+ npages += ret;
+ ret = 0;
+ break;
+
+ case MLX5_MKEY_MW:
+ mw = container_of(mmkey, struct mlx5_ib_mw, mmkey);
+
+ if (depth >= MLX5_CAP_GEN(dev->mdev, max_indirection)) {
+ mlx5_ib_dbg(dev, "indirection level exceeded\n");
+ ret = -EFAULT;
+ goto srcu_unlock;
+ }
+
+ outlen = MLX5_ST_SZ_BYTES(query_mkey_out) +
+ sizeof(*pklm) * (mw->ndescs - 2);
+
+ if (outlen > cur_outlen) {
+ kfree(out);
+ out = kzalloc(outlen, GFP_KERNEL);
+ if (!out) {
+ ret = -ENOMEM;
+ goto srcu_unlock;
+ }
+ cur_outlen = outlen;
+ }
+
+ pklm = (struct mlx5_klm *)MLX5_ADDR_OF(query_mkey_out, out,
+ bsf0_klm0_pas_mtt0_1);
+
+ ret = mlx5_core_query_mkey(dev->mdev, &mw->mmkey, out, outlen);
+ if (ret)
+ goto srcu_unlock;
+
+ offset = io_virt - MLX5_GET64(query_mkey_out, out,
+ memory_key_mkey_entry.start_addr);
+
+ for (i = 0; bcnt && i < mw->ndescs; i++, pklm++) {
+ if (offset >= be32_to_cpu(pklm->bcount)) {
+ offset -= be32_to_cpu(pklm->bcount);
+ continue;
+ }
+
+ frame = kzalloc(sizeof(*frame), GFP_KERNEL);
+ if (!frame) {
+ ret = -ENOMEM;
+ goto srcu_unlock;
+ }
+
+ frame->key = be32_to_cpu(pklm->key);
+ frame->io_virt = be64_to_cpu(pklm->va) + offset;
+ frame->bcnt = min_t(size_t, bcnt,
+ be32_to_cpu(pklm->bcount) - offset);
+ frame->depth = depth + 1;
+ frame->next = head;
+ head = frame;
+
+ bcnt -= frame->bcnt;
+ }
+ break;
+
+ default:
+ mlx5_ib_dbg(dev, "wrong mkey type %d\n", mmkey->type);
+ ret = -EFAULT;
goto srcu_unlock;
}
- /*
- * Avoid branches - this code will perform correctly
- * in all iterations (in iteration 2 and above,
- * bytes_committed == 0).
- */
- io_virt += *bytes_committed;
- bcnt -= *bytes_committed;
+ if (head) {
+ frame = head;
+ head = frame->next;
- npages = pagefault_mr(dev, mr, io_virt, size, bytes_mapped);
+ key = frame->key;
+ io_virt = frame->io_virt;
+ bcnt = frame->bcnt;
+ depth = frame->depth;
+ kfree(frame);
+
+ goto next_mr;
+ }
srcu_unlock:
+ while (head) {
+ frame = head;
+ head = frame->next;
+ kfree(frame);
+ }
+ kfree(out);
+
srcu_read_unlock(&dev->mr_srcu, srcu_key);
*bytes_committed = 0;
return ret ? ret : npages;

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