On 7/31/2014 11:01 AM, Or Gerlitz wrote:
From: Matan Barak <matanb@xxxxxxxxxxxx>
Add few helper functions to support a mechanism of getting an
MPT, modifying it and updating the HCA with the modified object.
The code takes 2 paths, one for directly changing the MPT (and sometimes
its related MTTs) and another one which queries the MPT and updates the
HCA via fw command SW2HW_MPT. The first path is used in native mode; the
second path is slower and is used only in SRIOV.
Hey Matan,
Couple of comments below...
Signed-off-by: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx>
Signed-off-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx4/mlx4.h | 2 +
drivers/net/ethernet/mellanox/mlx4/mr.c | 160 ++++++++++++++++++++
.../net/ethernet/mellanox/mlx4/resource_tracker.c | 26 +++-
include/linux/mlx4/device.h | 16 ++
4 files changed, 202 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index 1d8af73..b40d587 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -279,6 +279,8 @@ struct mlx4_icm_table {
#define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
#define MLX4_MPT_FLAG_REGION (1 << 8)
+#define MLX4_MPT_PD_MASK (0x1FFFFUL)
+#define MLX4_MPT_PD_VF_MASK (0xFE0000UL)
#define MLX4_MPT_PD_FLAG_FAST_REG (1 << 27)
#define MLX4_MPT_PD_FLAG_RAE (1 << 28)
#define MLX4_MPT_PD_FLAG_EN_INV (3 << 24)
diff --git a/drivers/net/ethernet/mellanox/mlx4/mr.c b/drivers/net/ethernet/mellanox/mlx4/mr.c
index 2839abb..7d717ec 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mr.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mr.c
@@ -298,6 +298,131 @@ static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox
MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
}
+int mlx4_mr_hw_get_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
+ struct mlx4_mpt_entry ***mpt_entry)
+{
+ int err;
+ int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);
+ struct mlx4_cmd_mailbox *mailbox = NULL;
+
+ /* Make sure that at this point we have single-threaded access only */
This is not a specific comment for the below, but a general comment for
the routine (otherwise I would expect the condition below to be
atomic_read). Maybe it's better to document it as a requirement of the
routine above (in kernel-doc style)?
+
+ if (mmr->enabled != MLX4_MPT_EN_HW)
+ return -EINVAL;
+
+ err = mlx4_HW2SW_MPT(dev, NULL, key);
Nit: I'd lose this extra line between err=/if(err) statements.
I see you did in some sections of this patch...
+
+ if (err) {
+ mlx4_warn(dev, "HW2SW_MPT failed (%d).", err);
+ mlx4_warn(dev, "Most likely the MR has MWs bound to it.\n");
+ return err;
+ }
+
+ mmr->enabled = MLX4_MPT_EN_SW;
+
+ if (!mlx4_is_mfunc(dev)) {
+ **mpt_entry = mlx4_table_find(
+ &mlx4_priv(dev)->mr_table.dmpt_table,
+ key, NULL);
+ } else {
+ mailbox = mlx4_alloc_cmd_mailbox(dev);
+ if (IS_ERR_OR_NULL(mailbox))
+ return PTR_ERR(mailbox);
+
+ err = mlx4_cmd_box(dev, 0, mailbox->dma, key,
+ 0, MLX4_CMD_QUERY_MPT,
+ MLX4_CMD_TIME_CLASS_B,
+ MLX4_CMD_WRAPPED);
+
+ if (err)
+ goto free_mailbox;
+
+ *mpt_entry = (struct mlx4_mpt_entry **)&mailbox->buf;
+ }
+
+ if (!(*mpt_entry) || !(**mpt_entry)) {
+ err = -ENOMEM;
+ goto free_mailbox;
+ }
+
+ return 0;
+
+free_mailbox:
+ mlx4_free_cmd_mailbox(dev, mailbox);
+ return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_hw_get_mpt);
+
+int mlx4_mr_hw_write_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
+ struct mlx4_mpt_entry **mpt_entry)
+{
+ int err;
+
+ if (!mlx4_is_mfunc(dev)) {
+ /* Make sure any changes to this entry are flushed */
+ wmb();
+
+ *(u8 *)(*mpt_entry) = MLX4_MPT_STATUS_HW;
+
+ /* Make sure the new status is written */
+ wmb();
+
+ err = mlx4_SYNC_TPT(dev);
+ } else {
+ int key = key_to_hw_index(mmr->key) & (dev->caps.num_mpts - 1);
+
+ struct mlx4_cmd_mailbox *mailbox =
+ container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
+ buf);
+
+ err = mlx4_SW2HW_MPT(dev, mailbox, key);
+ }
+
+ mmr->pd = be32_to_cpu((*mpt_entry)->pd_flags) & MLX4_MPT_PD_MASK;
Here you update the PD even if you failed while ib_core changes them
only if it succeeded, that would causes inconsistency. I think it will
be better to write this update only after write/put_mpt succeeded
(meaning it might be better to move it to the caller - mlx4_ib).
+ if (!err)
+ mmr->enabled = MLX4_MPT_EN_HW;
+ return err;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_hw_write_mpt);
+
+void mlx4_mr_hw_put_mpt(struct mlx4_dev *dev,
+ struct mlx4_mpt_entry **mpt_entry)
+{
+ if (mlx4_is_mfunc(dev)) {
+ struct mlx4_cmd_mailbox *mailbox =
+ container_of((void *)mpt_entry, struct mlx4_cmd_mailbox,
+ buf);
+ mlx4_free_cmd_mailbox(dev, mailbox);
+ }
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_hw_put_mpt);
+
+int mlx4_mr_hw_change_pd(struct mlx4_dev *dev, struct mlx4_mpt_entry *mpt_entry,
+ u32 pdn)
+{
+ u32 pd_flags = be32_to_cpu(mpt_entry->pd_flags);
+ /* The wrapper function will put the slave's id here */
+ if (mlx4_is_mfunc(dev))
+ pd_flags &= ~MLX4_MPT_PD_VF_MASK;
+ mpt_entry->pd_flags = cpu_to_be32((pd_flags & ~MLX4_MPT_PD_MASK) |
Here you protect against bad pd_flags (corrupted mpt_entry was given?)
with & ~MLX4_MPT_PD_MASK, but you might hide the mpt_corruption by
masking it... isn't it better to fail (internal error) in this case?
+ (pdn & MLX4_MPT_PD_MASK)
+ | MLX4_MPT_PD_FLAG_EN_INV);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_pd);
+
+int mlx4_mr_hw_change_access(struct mlx4_dev *dev,
+ struct mlx4_mpt_entry *mpt_entry,
+ u32 access)
+{
+ u32 flags = (be32_to_cpu(mpt_entry->flags) & ~MLX4_PERM_MASK) |
+ (access & MLX4_PERM_MASK);
+
+ mpt_entry->flags = cpu_to_be32(flags);
Note that you don't update the mmr access flags no where. after you
succeed query_mr will probably return the old permissions.
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_hw_change_access);
+
static int mlx4_mr_alloc_reserved(struct mlx4_dev *dev, u32 mridx, u32 pd,
u64 iova, u64 size, u32 access, int npages,
int page_shift, struct mlx4_mr *mr)
@@ -463,6 +588,41 @@ int mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
}
EXPORT_SYMBOL_GPL(mlx4_mr_free);
+void mlx4_mr_rereg_mem_cleanup(struct mlx4_dev *dev, struct mlx4_mr *mr)
+{
+ mlx4_mtt_cleanup(dev, &mr->mtt);
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_cleanup);
+
+int mlx4_mr_rereg_mem_write(struct mlx4_dev *dev, struct mlx4_mr *mr,
+ u64 iova, u64 size, int npages,
+ int page_shift, struct mlx4_mpt_entry *mpt_entry)
+{
+ int err;
+
+ mpt_entry->start = cpu_to_be64(mr->iova);
+ mpt_entry->length = cpu_to_be64(mr->size);
You pass u64 iova, u64 size, but you don't use them...
probably better to use them (and update the mmr after the change - at
mlx4_ib)
+ mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
+
+ err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
+ if (err)
+ return err;
+
+ if (mr->mtt.order < 0) {
+ mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
+ mpt_entry->mtt_addr = 0;
+ } else {
+ mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
+ &mr->mtt));
+ if (mr->mtt.page_shift == 0)
+ mpt_entry->mtt_sz = cpu_to_be32(1 << mr->mtt.order);
+ }
+ mr->enabled = MLX4_MPT_EN_SW;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_mr_rereg_mem_write);
+
int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
struct mlx4_cmd_mailbox *mailbox;
diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
index 0efc136..1089367 100644
--- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
+++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
@@ -2613,12 +2613,34 @@ int mlx4_QUERY_MPT_wrapper(struct mlx4_dev *dev, int slave,
if (err)
return err;
- if (mpt->com.from_state != RES_MPT_HW) {
+ if (mpt->com.from_state == RES_MPT_MAPPED) {
+ /* In order to allow rereg in SRIOV, we need to alter the MPT entry. To do
+ * that, the VF must read the MPT. But since the MPT entry memory is not
+ * in the VF's virtual memory space, it must use QUERY_MPT to obtain the
+ * entry contents. To guarantee that the MPT cannot be changed, the driver
+ * must perform HW2SW_MPT before this query and return the MPT entry to HW
+ * ownership fofollowing the change. The change here allows the VF to
+ * perform QUERY_MPT also when the entry is in SW ownership.
+ */
+ struct mlx4_mpt_entry *mpt_entry = mlx4_table_find(
+ &mlx4_priv(dev)->mr_table.dmpt_table,
+ mpt->key, NULL);
+
+ if (NULL == mpt_entry || NULL == outbox->buf) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ memcpy(outbox->buf, mpt_entry, sizeof(*mpt_entry));
+
+ err = 0;
+ } else if (mpt->com.from_state == RES_MPT_HW) {
+ err = mlx4_DMA_wrapper(dev, slave, vhcr, inbox, outbox, cmd);
+ } else {
err = -EBUSY;
goto out;
}
- err = mlx4_DMA_wrapper(dev, slave, vhcr, inbox, outbox, cmd);
out:
put_res(dev, slave, id, RES_MPT);
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index b12f4bb..a64c397 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -262,6 +262,7 @@ enum {
MLX4_PERM_REMOTE_WRITE = 1 << 13,
MLX4_PERM_ATOMIC = 1 << 14,
MLX4_PERM_BIND_MW = 1 << 15,
+ MLX4_PERM_MASK = 0xFC00
};
enum {
@@ -1243,4 +1244,19 @@ int mlx4_vf_smi_enabled(struct mlx4_dev *dev, int slave, int port);
int mlx4_vf_get_enable_smi_admin(struct mlx4_dev *dev, int slave, int port);
int mlx4_vf_set_enable_smi_admin(struct mlx4_dev *dev, int slave, int port,
int enable);
+int mlx4_mr_hw_get_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
+ struct mlx4_mpt_entry ***mpt_entry);
+int mlx4_mr_hw_write_mpt(struct mlx4_dev *dev, struct mlx4_mr *mmr,
+ struct mlx4_mpt_entry **mpt_entry);
+int mlx4_mr_hw_change_pd(struct mlx4_dev *dev, struct mlx4_mpt_entry *mpt_entry,
+ u32 pdn);
+int mlx4_mr_hw_change_access(struct mlx4_dev *dev,
+ struct mlx4_mpt_entry *mpt_entry,
+ u32 access);
+void mlx4_mr_hw_put_mpt(struct mlx4_dev *dev,
+ struct mlx4_mpt_entry **mpt_entry);
+void mlx4_mr_rereg_mem_cleanup(struct mlx4_dev *dev, struct mlx4_mr *mr);
+int mlx4_mr_rereg_mem_write(struct mlx4_dev *dev, struct mlx4_mr *mr,
+ u64 iova, u64 size, int npages,
+ int page_shift, struct mlx4_mpt_entry *mpt_entry);
#endif /* MLX4_DEVICE_H */
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