[PATCH v2 02/17] IB/mlx5: Enhance UMR support to allow partial page table update

Haggai Eran
2014-11-11T16:36:08Z

The current UMR interface doesn't allow partial updates to a memory region's
page tables. This patch changes the interface to allow that.

It also changes the way the UMR operation validates the memory region's state.
When set, IB_SEND_UMR_FAIL_IF_FREE will cause the UMR operation to fail if the
MKEY is in the free state. When it is unchecked the operation will check that
it isn't in the free state.

Signed-off-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Shachar Raindel <raindel-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 15 ++++++
drivers/infiniband/hw/mlx5/mr.c | 23 +++++----
drivers/infiniband/hw/mlx5/qp.c | 96 +++++++++++++++++++++++-------------
include/linux/mlx5/device.h | 9 ++++
4 files changed, 100 insertions(+), 43 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 29da55222070..53d19e6e69a4 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -111,6 +111,8 @@ struct mlx5_ib_pd {
*/

#define MLX5_IB_SEND_UMR_UNREG IB_SEND_RESERVED_START
+#define MLX5_IB_SEND_UMR_FAIL_IF_FREE (IB_SEND_RESERVED_START << 1)
+#define MLX5_IB_SEND_UMR_UPDATE_MTT (IB_SEND_RESERVED_START << 2)
#define MLX5_IB_QPT_REG_UMR IB_QPT_RESERVED1
#define MLX5_IB_WR_UMR IB_WR_RESERVED1

@@ -206,6 +208,19 @@ enum mlx5_ib_qp_flags {
MLX5_IB_QP_SIGNATURE_HANDLING = 1 << 1,
};

+struct mlx5_umr_wr {
+ union {
+ u64 virt_addr;
+ u64 offset;
+ } target;
+ struct ib_pd *pd;
+ unsigned int page_shift;
+ unsigned int npages;
+ u32 length;
+ int access_flags;
+ u32 mkey;
+};
+
struct mlx5_shared_mr_info {
int mr_id;
struct ib_umem *umem;
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 610500810f75..aee3527030ac 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -37,6 +37,7 @@
#include <linux/export.h>
#include <linux/delay.h>
#include <rdma/ib_umem.h>
+#include <rdma/ib_verbs.h>
#include "mlx5_ib.h"

enum {
@@ -675,6 +676,7 @@ static void prep_umr_reg_wqe(struct ib_pd *pd, struct ib_send_wr *wr,
{
struct mlx5_ib_dev *dev = to_mdev(pd->device);
struct ib_mr *mr = dev->umrc.mr;
+ struct mlx5_umr_wr *umrwr = (struct mlx5_umr_wr *)&wr->wr.fast_reg;

sg->addr = dma;
sg->length = ALIGN(sizeof(u64) * n, 64);
@@ -689,21 +691,24 @@ static void prep_umr_reg_wqe(struct ib_pd *pd, struct ib_send_wr *wr,
wr->num_sge = 0;

wr->opcode = MLX5_IB_WR_UMR;
- wr->wr.fast_reg.page_list_len = n;
- wr->wr.fast_reg.page_shift = page_shift;
- wr->wr.fast_reg.rkey = key;
- wr->wr.fast_reg.iova_start = virt_addr;
- wr->wr.fast_reg.length = len;
- wr->wr.fast_reg.access_flags = access_flags;
- wr->wr.fast_reg.page_list = (struct ib_fast_reg_page_list *)pd;
+
+ umrwr->npages = n;
+ umrwr->page_shift = page_shift;
+ umrwr->mkey = key;
+ umrwr->target.virt_addr = virt_addr;
+ umrwr->length = len;
+ umrwr->access_flags = access_flags;
+ umrwr->pd = pd;
}

static void prep_umr_unreg_wqe(struct mlx5_ib_dev *dev,
struct ib_send_wr *wr, u32 key)
{
- wr->send_flags = MLX5_IB_SEND_UMR_UNREG;
+ struct mlx5_umr_wr *umrwr = (struct mlx5_umr_wr *)&wr->wr.fast_reg;
+
+ wr->send_flags = MLX5_IB_SEND_UMR_UNREG | MLX5_IB_SEND_UMR_FAIL_IF_FREE;
wr->opcode = MLX5_IB_WR_UMR;
- wr->wr.fast_reg.rkey = key;
+ umrwr->mkey = key;
}

void mlx5_umr_cq_handler(struct ib_cq *cq, void *cq_context)
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index e261a53f9a02..7f362afa1a38 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -70,15 +70,6 @@ static const u32 mlx5_ib_opcode[] = {
[MLX5_IB_WR_UMR] = MLX5_OPCODE_UMR,
};

-struct umr_wr {
- u64 virt_addr;
- struct ib_pd *pd;
- unsigned int page_shift;
- unsigned int npages;
- u32 length;
- int access_flags;
- u32 mkey;
-};

static int is_qp0(enum ib_qp_type qp_type)
{
@@ -1838,37 +1829,70 @@ static void set_frwr_umr_segment(struct mlx5_wqe_umr_ctrl_seg *umr,
umr->mkey_mask = frwr_mkey_mask();
}

+static __be64 get_umr_reg_mr_mask(void)
+{
+ u64 result;
+
+ result = MLX5_MKEY_MASK_LEN |
+ MLX5_MKEY_MASK_PAGE_SIZE |
+ MLX5_MKEY_MASK_START_ADDR |
+ MLX5_MKEY_MASK_PD |
+ MLX5_MKEY_MASK_LR |
+ MLX5_MKEY_MASK_LW |
+ MLX5_MKEY_MASK_KEY |
+ MLX5_MKEY_MASK_RR |
+ MLX5_MKEY_MASK_RW |
+ MLX5_MKEY_MASK_A |
+ MLX5_MKEY_MASK_FREE;
+
+ return cpu_to_be64(result);
+}
+
+static __be64 get_umr_unreg_mr_mask(void)
+{
+ u64 result;
+
+ result = MLX5_MKEY_MASK_FREE;
+
+ return cpu_to_be64(result);
+}
+
+static __be64 get_umr_update_mtt_mask(void)
+{
+ u64 result;
+
+ result = MLX5_MKEY_MASK_FREE;
+
+ return cpu_to_be64(result);
+}
+
static void set_reg_umr_segment(struct mlx5_wqe_umr_ctrl_seg *umr,
struct ib_send_wr *wr)
{
- struct umr_wr *umrwr = (struct umr_wr *)&wr->wr.fast_reg;
- u64 mask;
+ struct mlx5_umr_wr *umrwr = (struct mlx5_umr_wr *)&wr->wr.fast_reg;

memset(umr, 0, sizeof(*umr));

+ if (wr->send_flags & MLX5_IB_SEND_UMR_FAIL_IF_FREE)
+ umr->flags = MLX5_UMR_CHECK_FREE; /* fail if free */
+ else
+ umr->flags = MLX5_UMR_CHECK_NOT_FREE; /* fail if not free */
+
if (!(wr->send_flags & MLX5_IB_SEND_UMR_UNREG)) {
- umr->flags = 1 << 5; /* fail if not free */
umr->klm_octowords = get_klm_octo(umrwr->npages);
- mask = MLX5_MKEY_MASK_LEN |
- MLX5_MKEY_MASK_PAGE_SIZE |
- MLX5_MKEY_MASK_START_ADDR |
- MLX5_MKEY_MASK_PD |
- MLX5_MKEY_MASK_LR |
- MLX5_MKEY_MASK_LW |
- MLX5_MKEY_MASK_KEY |
- MLX5_MKEY_MASK_RR |
- MLX5_MKEY_MASK_RW |
- MLX5_MKEY_MASK_A |
- MLX5_MKEY_MASK_FREE;
- umr->mkey_mask = cpu_to_be64(mask);
+ if (wr->send_flags & MLX5_IB_SEND_UMR_UPDATE_MTT) {
+ umr->mkey_mask = get_umr_update_mtt_mask();
+ umr->bsf_octowords = get_klm_octo(umrwr->target.offset);
+ umr->flags |= MLX5_UMR_TRANSLATION_OFFSET_EN;
+ } else {
+ umr->mkey_mask = get_umr_reg_mr_mask();
+ }
} else {
- umr->flags = 2 << 5; /* fail if free */
- mask = MLX5_MKEY_MASK_FREE;
- umr->mkey_mask = cpu_to_be64(mask);
+ umr->mkey_mask = get_umr_unreg_mr_mask();
}

if (!wr->num_sge)
- umr->flags |= (1 << 7); /* inline */
+ umr->flags |= MLX5_UMR_INLINE;
}

static u8 get_umr_flags(int acc)
@@ -1902,19 +1926,23 @@ static void set_mkey_segment(struct mlx5_mkey_seg *seg, struct ib_send_wr *wr,

static void set_reg_mkey_segment(struct mlx5_mkey_seg *seg, struct ib_send_wr *wr)
{
+ struct mlx5_umr_wr *umrwr = (struct mlx5_umr_wr *)&wr->wr.fast_reg;
+
memset(seg, 0, sizeof(*seg));
if (wr->send_flags & MLX5_IB_SEND_UMR_UNREG) {
seg->status = 1 << 6;
return;
}

- seg->flags = convert_access(wr->wr.fast_reg.access_flags);
- seg->flags_pd = cpu_to_be32(to_mpd((struct ib_pd *)wr->wr.fast_reg.page_list)->pdn);
- seg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start);
- seg->len = cpu_to_be64(wr->wr.fast_reg.length);
- seg->log2_page_size = wr->wr.fast_reg.page_shift;
+ seg->flags = convert_access(umrwr->access_flags);
+ if (!(wr->send_flags & MLX5_IB_SEND_UMR_UPDATE_MTT)) {
+ seg->flags_pd = cpu_to_be32(to_mpd(umrwr->pd)->pdn);
+ seg->start_addr = cpu_to_be64(umrwr->target.virt_addr);
+ }
+ seg->len = cpu_to_be64(umrwr->length);
+ seg->log2_page_size = umrwr->page_shift;
seg->qpn_mkey7_0 = cpu_to_be32(0xffffff00 |
- mlx5_mkey_variant(wr->wr.fast_reg.rkey));
+ mlx5_mkey_variant(umrwr->mkey));
}

static void set_frwr_pages(struct mlx5_wqe_data_seg *dseg,
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 1d67fd32e71c..bc0193590598 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -180,6 +180,15 @@ enum {
MLX5_MKEY_MASK_FREE = 1ull << 29,
};

+enum {
+ MLX5_UMR_TRANSLATION_OFFSET_EN = (1 << 4),
+
+ MLX5_UMR_CHECK_NOT_FREE = (1 << 5),
+ MLX5_UMR_CHECK_FREE = (2 << 5),
+
+ MLX5_UMR_INLINE = (1 << 7),
+};
+
enum mlx5_event {
MLX5_EVENT_TYPE_COMP = 0x0,