IB/isert: Introduce isert_map/unmap_data_buf
export map/unmap data buffer to a routine that may
be used in various places in the code and keep the
mapping data in a designated descriptor. Also, let
isert_fast_reg_mr to decide weather to use global
MR or do fast registration.
This commit does not change any functionality.
(Fix context change for v3.14-rc6 code - nab)
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 8ee228e..d0ca332 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1392,19 +1392,60 @@
}
}
+static int
+isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+ struct scatterlist *sg, u32 nents, u32 length, u32 offset,
+ enum iser_ib_op_code op, struct isert_data_buf *data)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+ data->dma_dir = op == ISER_IB_RDMA_WRITE ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ data->len = length - offset;
+ data->offset = offset;
+ data->sg_off = data->offset / PAGE_SIZE;
+
+ data->sg = &sg[data->sg_off];
+ data->nents = min_t(unsigned int, nents - data->sg_off,
+ ISCSI_ISER_SG_TABLESIZE);
+ data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
+ PAGE_SIZE);
+
+ data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
+ data->dma_dir);
+ if (unlikely(!data->dma_nents)) {
+ pr_err("Cmd: unable to dma map SGs %p\n", sg);
+ return -EINVAL;
+ }
+
+ pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
+ isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
+
+ return 0;
+}
+
+static void
+isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
+{
+ struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+ ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
+ memset(data, 0, sizeof(*data));
+}
+
+
+
static void
isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
{
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
- struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
- if (wr->sge) {
+
+ if (wr->data.sg) {
pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
- ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
- wr->sge = NULL;
+ isert_unmap_data_buf(isert_conn, &wr->data);
}
if (wr->send_wr) {
@@ -1424,7 +1465,6 @@
isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
{
struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
- struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
LIST_HEAD(unmap_list);
pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
@@ -1438,12 +1478,9 @@
wr->fr_desc = NULL;
}
- if (wr->sge) {
+ if (wr->data.sg) {
pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
- ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
- wr->sge = NULL;
+ isert_unmap_data_buf(isert_conn, &wr->data);
}
wr->ib_sge = NULL;
@@ -1548,7 +1585,7 @@
iscsit_stop_dataout_timer(cmd);
device->unreg_rdma_mem(isert_cmd, isert_conn);
- cmd->write_data_done = wr->cur_rdma_length;
+ cmd->write_data_done = wr->data.len;
wr->send_wr_num = 0;
pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
@@ -2099,54 +2136,39 @@
struct se_cmd *se_cmd = &cmd->se_cmd;
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
- struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_data_buf *data = &wr->data;
struct ib_send_wr *send_wr;
struct ib_sge *ib_sge;
- struct scatterlist *sg_start;
- u32 sg_off = 0, sg_nents;
- u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
- int ret = 0, count, i, ib_sge_cnt;
+ u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
+ int ret = 0, i, ib_sge_cnt;
- if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
- data_left = se_cmd->data_length;
- } else {
- sg_off = cmd->write_data_done / PAGE_SIZE;
- data_left = se_cmd->data_length - cmd->write_data_done;
- offset = cmd->write_data_done;
- isert_cmd->tx_desc.isert_cmd = isert_cmd;
- }
+ isert_cmd->tx_desc.isert_cmd = isert_cmd;
- sg_start = &cmd->se_cmd.t_data_sg[sg_off];
- sg_nents = se_cmd->t_data_nents - sg_off;
+ offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
+ ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
+ se_cmd->t_data_nents, se_cmd->data_length,
+ offset, wr->iser_ib_op, &wr->data);
+ if (ret)
+ return ret;
- count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
- if (unlikely(!count)) {
- pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
- return -EINVAL;
- }
- wr->sge = sg_start;
- wr->num_sge = sg_nents;
- wr->cur_rdma_length = data_left;
- pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
- isert_cmd, count, sg_start, sg_nents, data_left);
+ data_left = data->len;
+ offset = data->offset;
- ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
+ ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
if (!ib_sge) {
pr_warn("Unable to allocate ib_sge\n");
ret = -ENOMEM;
- goto unmap_sg;
+ goto unmap_cmd;
}
wr->ib_sge = ib_sge;
- wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
+ wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
GFP_KERNEL);
if (!wr->send_wr) {
pr_debug("Unable to allocate wr->send_wr\n");
ret = -ENOMEM;
- goto unmap_sg;
+ goto unmap_cmd;
}
wr->isert_cmd = isert_cmd;
@@ -2185,10 +2207,9 @@
}
return 0;
-unmap_sg:
- ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
+unmap_cmd:
+ isert_unmap_data_buf(isert_conn, data);
+
return ret;
}
@@ -2232,10 +2253,10 @@
}
static int
-isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
- struct isert_conn *isert_conn, struct scatterlist *sg_start,
- struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
- unsigned int data_len)
+isert_fast_reg_mr(struct isert_conn *isert_conn,
+ struct fast_reg_descriptor *fr_desc,
+ struct isert_data_buf *mem,
+ struct ib_sge *sge)
{
struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
struct ib_send_wr fr_wr, inv_wr;
@@ -2244,13 +2265,19 @@
u32 page_off;
u8 key;
- sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
- page_off = offset % PAGE_SIZE;
+ if (mem->dma_nents == 1) {
+ sge->lkey = isert_conn->conn_mr->lkey;
+ sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
+ sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
+ return 0;
+ }
+
+ page_off = mem->offset % PAGE_SIZE;
pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
- fr_desc, sg_nents, offset);
+ fr_desc, mem->nents, mem->offset);
- pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
+ pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
&fr_desc->data_frpl->page_list[0]);
if (!fr_desc->valid) {
@@ -2273,7 +2300,7 @@
fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
fr_wr.wr.fast_reg.page_list_len = pagelist_len;
fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
- fr_wr.wr.fast_reg.length = data_len;
+ fr_wr.wr.fast_reg.length = mem->len;
fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
@@ -2289,12 +2316,12 @@
}
fr_desc->valid = false;
- ib_sge->lkey = fr_desc->data_mr->lkey;
- ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
- ib_sge->length = data_len;
+ sge->lkey = fr_desc->data_mr->lkey;
+ sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
+ sge->length = mem->len;
pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
- ib_sge->addr, ib_sge->length, ib_sge->lkey);
+ sge->addr, sge->length, sge->lkey);
return ret;
}
@@ -2305,54 +2332,43 @@
{
struct se_cmd *se_cmd = &cmd->se_cmd;
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
- struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
- struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+ struct isert_conn *isert_conn = conn->context;
struct ib_send_wr *send_wr;
- struct ib_sge *ib_sge;
- struct scatterlist *sg_start;
- struct fast_reg_descriptor *fr_desc;
- u32 sg_off = 0, sg_nents;
- u32 offset = 0, data_len, data_left, rdma_write_max;
- int ret = 0, count;
+ struct fast_reg_descriptor *fr_desc = NULL;
+ u32 offset;
+ int ret = 0;
unsigned long flags;
- if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
- data_left = se_cmd->data_length;
- } else {
- offset = cmd->write_data_done;
- sg_off = offset / PAGE_SIZE;
- data_left = se_cmd->data_length - cmd->write_data_done;
- isert_cmd->tx_desc.isert_cmd = isert_cmd;
+ isert_cmd->tx_desc.isert_cmd = isert_cmd;
+
+ offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
+ ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
+ se_cmd->t_data_nents, se_cmd->data_length,
+ offset, wr->iser_ib_op, &wr->data);
+ if (ret)
+ return ret;
+
+ if (wr->data.dma_nents != 1) {
+ spin_lock_irqsave(&isert_conn->conn_lock, flags);
+ fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
+ struct fast_reg_descriptor, list);
+ list_del(&fr_desc->list);
+ spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
+ wr->fr_desc = fr_desc;
}
- sg_start = &cmd->se_cmd.t_data_sg[sg_off];
- sg_nents = se_cmd->t_data_nents - sg_off;
+ ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, &wr->s_ib_sge);
+ if (ret)
+ goto unmap_cmd;
- count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
- if (unlikely(!count)) {
- pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
- return -EINVAL;
- }
- wr->sge = sg_start;
- wr->num_sge = sg_nents;
- pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
- isert_cmd, count, sg_start, sg_nents, data_left);
-
- memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
- ib_sge = &wr->s_ib_sge;
- wr->ib_sge = ib_sge;
-
+ wr->ib_sge = &wr->s_ib_sge;
wr->send_wr_num = 1;
memset(&wr->s_send_wr, 0, sizeof(*send_wr));
wr->send_wr = &wr->s_send_wr;
-
wr->isert_cmd = isert_cmd;
- rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
send_wr = &isert_cmd->rdma_wr.s_send_wr;
- send_wr->sg_list = ib_sge;
+ send_wr->sg_list = &wr->s_ib_sge;
send_wr->num_sge = 1;
send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
@@ -2368,37 +2384,15 @@
send_wr->send_flags = IB_SEND_SIGNALED;
}
- data_len = min(data_left, rdma_write_max);
- wr->cur_rdma_length = data_len;
-
- /* if there is a single dma entry, dma mr is sufficient */
- if (count == 1) {
- ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
- ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
- ib_sge->lkey = isert_conn->conn_mr->lkey;
- wr->fr_desc = NULL;
- } else {
- spin_lock_irqsave(&isert_conn->conn_lock, flags);
- fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
- struct fast_reg_descriptor, list);
- list_del(&fr_desc->list);
- spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
- wr->fr_desc = fr_desc;
-
- ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
- ib_sge, sg_nents, offset, data_len);
- if (ret) {
- list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
- goto unmap_sg;
- }
- }
-
return 0;
+unmap_cmd:
+ if (fr_desc) {
+ spin_lock_irqsave(&isert_conn->conn_lock, flags);
+ list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
+ spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
+ }
+ isert_unmap_data_buf(isert_conn, &wr->data);
-unmap_sg:
- ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
- (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
- DMA_TO_DEVICE : DMA_FROM_DEVICE);
return ret;
}