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IB/iser: Simplify send flow/descriptors

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Simplify and shrink the logic/code used for the send descriptors.
Changes include removing struct iser_dto (an unnecessary abstraction),
using struct iser_regd_buf only for handling SCSI commands, using
dma_sync instead of dma_map/unmap, etc.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Or Gerlitz 2010-02-08 13:19:56 +00:00 committed by Roland Dreier
parent 78ad0a34dc
commit f19624aa92
5 changed files with 115 additions and 278 deletions
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34
drivers/infiniband/ulp/iser/iscsi_iser.c
View File

@ -128,6 +128,28 @@ static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
return 0;
}
int iser_initialize_task_headers(struct iscsi_task *task,
struct iser_tx_desc *tx_desc)
{
struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
struct iser_device *device = iser_conn->ib_conn->device;
struct iscsi_iser_task *iser_task = task->dd_data;
u64 dma_addr;
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr))
return -ENOMEM;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
tx_desc->tx_sg[0].lkey = device->mr->lkey;
iser_task->headers_initialized = 1;
iser_task->iser_conn = iser_conn;
return 0;
}
/**
* iscsi_iser_task_init - Initialize task
* @task: iscsi task
@ -137,17 +159,17 @@ static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
static int
iscsi_iser_task_init(struct iscsi_task *task)
{
struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
struct iscsi_iser_task *iser_task = task->dd_data;
if (!iser_task->headers_initialized)
if (iser_initialize_task_headers(task, &iser_task->desc))
return -ENOMEM;
/* mgmt task */
if (!task->sc) {
iser_task->desc.data = task->data;
if (!task->sc)
return 0;
}
iser_task->command_sent = 0;
iser_task->iser_conn = iser_conn;
iser_task_rdma_init(iser_task);
return 0;
}
@ -675,7 +697,7 @@ static int __init iser_init(void)
memset(&ig, 0, sizeof(struct iser_global));
ig.desc_cache = kmem_cache_create("iser_descriptors",
sizeof (struct iser_desc),
sizeof(struct iser_tx_desc),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (ig.desc_cache == NULL)

48
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -193,28 +193,8 @@ struct iser_regd_buf {
struct iser_mem_reg reg; /* memory registration info */
void *virt_addr;
struct iser_device *device; /* device->device for dma_unmap */
u64 dma_addr; /* if non zero, addr for dma_unmap */
enum dma_data_direction direction; /* direction for dma_unmap */
unsigned int data_size;
atomic_t ref_count; /* refcount, freed when dec to 0 */
};
#define MAX_REGD_BUF_VECTOR_LEN 2
struct iser_dto {
struct iscsi_iser_task *task;
struct iser_conn *ib_conn;
int notify_enable;
/* vector of registered buffers */
unsigned int regd_vector_len;
struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
/* offset into the registered buffer may be specified */
unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
/* a smaller size may be specified, if 0, then full size is used */
unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
};
enum iser_desc_type {
@ -223,14 +203,15 @@ enum iser_desc_type {
ISCSI_TX_DATAOUT
};
struct iser_desc {
struct iser_tx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
struct iser_regd_buf hdr_regd_buf;
void *data; /* used by RX & TX_CONTROL */
struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
enum iser_desc_type type;
struct iser_dto dto;
u64 dma_addr;
/* sg[0] points to iser/iscsi headers, sg[1] optionally points to either
of immediate data, unsolicited data-out or control (login,text) */
struct ib_sge tx_sg[2];
int num_sge;
};
#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
@ -287,7 +268,7 @@ struct iscsi_iser_conn {
};
struct iscsi_iser_task {
struct iser_desc desc;
struct iser_tx_desc desc;
struct iscsi_iser_conn *iser_conn;
enum iser_task_status status;
int command_sent; /* set if command sent */
@ -295,6 +276,7 @@ struct iscsi_iser_task {
struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
int headers_initialized;
};
struct iser_page_vec {
@ -346,22 +328,14 @@ void iser_rcv_completion(struct iser_rx_desc *desc,
unsigned long dto_xfer_len,
struct iser_conn *ib_conn);
void iser_snd_completion(struct iser_desc *desc);
void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn);
void iser_task_rdma_init(struct iscsi_iser_task *task);
void iser_task_rdma_finalize(struct iscsi_iser_task *task);
void iser_dto_buffs_release(struct iser_dto *dto);
int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
void iser_free_rx_descriptors(struct iser_conn *ib_conn);
void iser_reg_single(struct iser_device *device,
struct iser_regd_buf *regd_buf,
enum dma_data_direction direction);
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
enum iser_data_dir cmd_dir);
@ -381,7 +355,7 @@ void iser_unreg_mem(struct iser_mem_reg *mem_reg);
int iser_post_recvl(struct iser_conn *ib_conn);
int iser_post_recvm(struct iser_conn *ib_conn, int count);
int iser_post_send(struct iser_desc *tx_desc);
int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc);
int iser_conn_state_comp(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp);
@ -392,4 +366,6 @@ int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
enum dma_data_direction dma_dir);
void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);
int iser_initialize_task_headers(struct iscsi_task *task,
struct iser_tx_desc *tx_desc);
#endif

176
drivers/infiniband/ulp/iser/iser_initiator.c
View File

@ -39,26 +39,6 @@
#include "iscsi_iser.h"
/* iser_dto_add_regd_buff - increments the reference count for *
* the registered buffer & adds it to the DTO object */
static void iser_dto_add_regd_buff(struct iser_dto *dto,
struct iser_regd_buf *regd_buf,
unsigned long use_offset,
unsigned long use_size)
{
int add_idx;
atomic_inc(&regd_buf->ref_count);
add_idx = dto->regd_vector_len;
dto->regd[add_idx] = regd_buf;
dto->used_sz[add_idx] = use_size;
dto->offset[add_idx] = use_offset;
dto->regd_vector_len++;
}
/* Register user buffer memory and initialize passive rdma
* dto descriptor. Total data size is stored in
* iser_task->data[ISER_DIR_IN].data_len
@ -119,9 +99,9 @@ iser_prepare_write_cmd(struct iscsi_task *task,
struct iscsi_iser_task *iser_task = task->dd_data;
struct iser_regd_buf *regd_buf;
int err;
struct iser_dto *send_dto = &iser_task->desc.dto;
struct iser_hdr *hdr = &iser_task->desc.iser_header;
struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
err = iser_dma_map_task_data(iser_task,
buf_out,
@ -160,37 +140,36 @@ iser_prepare_write_cmd(struct iscsi_task *task,
if (imm_sz > 0) {
iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
task->itt, imm_sz);
iser_dto_add_regd_buff(send_dto,
regd_buf,
0,
imm_sz);
tx_dsg->addr = regd_buf->reg.va;
tx_dsg->length = imm_sz;
tx_dsg->lkey = regd_buf->reg.lkey;
iser_task->desc.num_sge = 2;
}
return 0;
}
/* creates a new tx descriptor and adds header regd buffer */
static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
struct iser_desc *tx_desc)
static void iser_create_send_desc(struct iser_conn *ib_conn,
struct iser_tx_desc *tx_desc)
{
struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
struct iser_dto *send_dto = &tx_desc->dto;
struct iser_device *device = ib_conn->device;
memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
regd_hdr->device = iser_conn->ib_conn->device;
regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
regd_hdr->data_size = ISER_HEADERS_LEN;
send_dto->ib_conn = iser_conn->ib_conn;
send_dto->notify_enable = 1;
send_dto->regd_vector_len = 0;
ib_dma_sync_single_for_cpu(device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
tx_desc->iser_header.flags = ISER_VER;
iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
tx_desc->num_sge = 1;
if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
tx_desc->tx_sg[0].lkey = device->mr->lkey;
iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
}
}
int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
{
int i, j;
@ -303,12 +282,12 @@ int iser_send_command(struct iscsi_conn *conn,
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
struct iscsi_iser_task *iser_task = task->dd_data;
struct iser_dto *send_dto = NULL;
unsigned long edtl;
int err;
struct iser_data_buf *data_buf;
struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr;
struct scsi_cmnd *sc = task->sc;
struct iser_tx_desc *tx_desc = &iser_task->desc;
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
@ -320,10 +299,8 @@ int iser_send_command(struct iscsi_conn *conn,
edtl = ntohl(hdr->data_length);
/* build the tx desc regd header and add it to the tx desc dto */
iser_task->desc.type = ISCSI_TX_SCSI_COMMAND;
send_dto = &iser_task->desc.dto;
send_dto->task = iser_task;
iser_create_send_desc(iser_conn, &iser_task->desc);
tx_desc->type = ISCSI_TX_SCSI_COMMAND;
iser_create_send_desc(iser_conn->ib_conn, tx_desc);
if (hdr->flags & ISCSI_FLAG_CMD_READ)
data_buf = &iser_task->data[ISER_DIR_IN];
@ -352,17 +329,13 @@ int iser_send_command(struct iscsi_conn *conn,
goto send_command_error;
}
iser_reg_single(iser_conn->ib_conn->device,
send_dto->regd[0], DMA_TO_DEVICE);
iser_task->status = ISER_TASK_STATUS_STARTED;
err = iser_post_send(&iser_task->desc);
err = iser_post_send(iser_conn->ib_conn, tx_desc);
if (!err)
return 0;
send_command_error:
iser_dto_buffs_release(send_dto);
iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
return err;
}
@ -376,12 +349,14 @@ int iser_send_data_out(struct iscsi_conn *conn,
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
struct iscsi_iser_task *iser_task = task->dd_data;
struct iser_desc *tx_desc = NULL;
struct iser_dto *send_dto = NULL;
struct iser_tx_desc *tx_desc = NULL;
struct iser_regd_buf *regd_buf;
unsigned long buf_offset;
unsigned long data_seg_len;
uint32_t itt;
int err = 0;
struct ib_sge *tx_dsg;
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
@ -398,28 +373,25 @@ int iser_send_data_out(struct iscsi_conn *conn,
iser_dbg("%s itt %d dseg_len %d offset %d\n",
__func__,(int)itt,(int)data_seg_len,(int)buf_offset);
tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_NOIO);
if (tx_desc == NULL) {
iser_err("Failed to alloc desc for post dataout\n");
return -ENOMEM;
}
tx_desc->type = ISCSI_TX_DATAOUT;
tx_desc->iser_header.flags = ISER_VER;
memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
/* build the tx desc regd header and add it to the tx desc dto */
send_dto = &tx_desc->dto;
send_dto->task = iser_task;
iser_create_send_desc(iser_conn, tx_desc);
/* build the tx desc */
iser_initialize_task_headers(task, tx_desc);
iser_reg_single(iser_conn->ib_conn->device,
send_dto->regd[0], DMA_TO_DEVICE);
/* all data was registered for RDMA, we can use the lkey */
iser_dto_add_regd_buff(send_dto,
&iser_task->rdma_regd[ISER_DIR_OUT],
buf_offset,
data_seg_len);
regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
tx_dsg = &tx_desc->tx_sg[1];
tx_dsg->addr = regd_buf->reg.va + buf_offset;
tx_dsg->length = data_seg_len;
tx_dsg->lkey = regd_buf->reg.lkey;
tx_desc->num_sge = 2;
if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
iser_err("Offset:%ld & DSL:%ld in Data-Out "
@ -433,12 +405,11 @@ int iser_send_data_out(struct iscsi_conn *conn,
itt, buf_offset, data_seg_len);
err = iser_post_send(tx_desc);
err = iser_post_send(iser_conn->ib_conn, tx_desc);
if (!err)
return 0;
send_data_out_error:
iser_dto_buffs_release(send_dto);
kmem_cache_free(ig.desc_cache, tx_desc);
iser_err("conn %p failed err %d\n",conn, err);
return err;
@ -449,11 +420,9 @@ int iser_send_control(struct iscsi_conn *conn,
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
struct iscsi_iser_task *iser_task = task->dd_data;
struct iser_desc *mdesc = &iser_task->desc;
struct iser_dto *send_dto = NULL;
struct iser_tx_desc *mdesc = &iser_task->desc;
unsigned long data_seg_len;
int err;
struct iser_regd_buf *regd_buf;
int err = 0;
struct iser_device *device;
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
@ -466,27 +435,24 @@ int iser_send_control(struct iscsi_conn *conn,
/* build the tx desc regd header and add it to the tx desc dto */
mdesc->type = ISCSI_TX_CONTROL;
send_dto = &mdesc->dto;
send_dto->task = NULL;
iser_create_send_desc(iser_conn, mdesc);
iser_create_send_desc(iser_conn->ib_conn, mdesc);
device = iser_conn->ib_conn->device;
iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
data_seg_len = ntoh24(task->hdr->dlength);
if (data_seg_len > 0) {
regd_buf = &mdesc->data_regd_buf;
memset(regd_buf, 0, sizeof(struct iser_regd_buf));
regd_buf->device = device;
regd_buf->virt_addr = task->data;
regd_buf->data_size = task->data_count;
iser_reg_single(device, regd_buf,
DMA_TO_DEVICE);
iser_dto_add_regd_buff(send_dto, regd_buf,
0,
data_seg_len);
struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
if (task != conn->login_task) {
iser_err("data present on non login task!!!\n");
goto send_control_error;
}
memcpy(iser_conn->ib_conn->login_buf, task->data,
task->data_count);
tx_dsg->addr = iser_conn->ib_conn->login_dma;
tx_dsg->length = data_seg_len;
tx_dsg->lkey = device->mr->lkey;
mdesc->num_sge = 2;
}
if (task == conn->login_task) {
@ -495,12 +461,11 @@ int iser_send_control(struct iscsi_conn *conn,
goto send_control_error;
}
err = iser_post_send(mdesc);
err = iser_post_send(iser_conn->ib_conn, mdesc);
if (!err)
return 0;
send_control_error:
iser_dto_buffs_release(send_dto);
iser_err("conn %p failed err %d\n",conn, err);
return err;
}
@ -584,21 +549,20 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc,
}
}
void iser_snd_completion(struct iser_desc *tx_desc)
void iser_snd_completion(struct iser_tx_desc *tx_desc,
struct iser_conn *ib_conn)
{
struct iser_dto *dto = &tx_desc->dto;
struct iser_conn *ib_conn = dto->ib_conn;
struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn;
struct iscsi_conn *conn = iser_conn->iscsi_conn;
struct iscsi_task *task;
int resume_tx = 0;
struct iser_device *device = ib_conn->device;
iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
iser_dto_buffs_release(dto);
if (tx_desc->type == ISCSI_TX_DATAOUT)
if (tx_desc->type == ISCSI_TX_DATAOUT) {
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
kmem_cache_free(ig.desc_cache, tx_desc);
}
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
ISER_QP_MAX_REQ_DTOS)
@ -639,7 +603,6 @@ void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
{
int deferred;
int is_rdma_aligned = 1;
struct iser_regd_buf *regd;
@ -657,32 +620,17 @@ void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
if (iser_task->dir[ISER_DIR_IN]) {
regd = &iser_task->rdma_regd[ISER_DIR_IN];
deferred = iser_regd_buff_release(regd);
if (deferred) {
iser_err("%d references remain for BUF-IN rdma reg\n",
atomic_read(&regd->ref_count));
}
if (regd->reg.is_fmr)
iser_unreg_mem(&regd->reg);
}
if (iser_task->dir[ISER_DIR_OUT]) {
regd = &iser_task->rdma_regd[ISER_DIR_OUT];
deferred = iser_regd_buff_release(regd);
if (deferred) {
iser_err("%d references remain for BUF-OUT rdma reg\n",
atomic_read(&regd->ref_count));
}
if (regd->reg.is_fmr)
iser_unreg_mem(&regd->reg);
}
/* if the data was unaligned, it was already unmapped and then copied */
if (is_rdma_aligned)
iser_dma_unmap_task_data(iser_task);
}
void iser_dto_buffs_release(struct iser_dto *dto)
{
int i;
for (i = 0; i < dto->regd_vector_len; i++)
iser_regd_buff_release(dto->regd[i]);
}

60
drivers/infiniband/ulp/iser/iser_memory.c
View File

@ -40,62 +40,6 @@
#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
/**
* Decrements the reference count for the
* registered buffer & releases it
*
* returns 0 if released, 1 if deferred
*/
int iser_regd_buff_release(struct iser_regd_buf *regd_buf)
{
struct ib_device *dev;
if ((atomic_read(&regd_buf->ref_count) == 0) ||
atomic_dec_and_test(&regd_buf->ref_count)) {
/* if we used the dma mr, unreg is just NOP */
if (regd_buf->reg.is_fmr)
iser_unreg_mem(&regd_buf->reg);
if (regd_buf->dma_addr) {
dev = regd_buf->device->ib_device;
ib_dma_unmap_single(dev,
regd_buf->dma_addr,
regd_buf->data_size,
regd_buf->direction);
}
/* else this regd buf is associated with task which we */
/* dma_unmap_single/sg later */
return 0;
} else {
iser_dbg("Release deferred, regd.buff: 0x%p\n", regd_buf);
return 1;
}
}
/**
* iser_reg_single - fills registered buffer descriptor with
* registration information
*/
void iser_reg_single(struct iser_device *device,
struct iser_regd_buf *regd_buf,
enum dma_data_direction direction)
{
u64 dma_addr;
dma_addr = ib_dma_map_single(device->ib_device,
regd_buf->virt_addr,
regd_buf->data_size, direction);
BUG_ON(ib_dma_mapping_error(device->ib_device, dma_addr));
regd_buf->reg.lkey = device->mr->lkey;
regd_buf->reg.len = regd_buf->data_size;
regd_buf->reg.va = dma_addr;
regd_buf->reg.is_fmr = 0;
regd_buf->dma_addr = dma_addr;
regd_buf->direction = direction;
}
/**
* iser_start_rdma_unaligned_sg
*/
@ -474,9 +418,5 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *iser_task,
return err;
}
}
/* take a reference on this regd buf such that it will not be released *
* (eg in send dto completion) before we get the scsi response */
atomic_inc(&regd_buf->ref_count);
return 0;
}

75
drivers/infiniband/ulp/iser/iser_verbs.c
View File

@ -194,7 +194,7 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
init_attr.recv_cq = device->rx_cq;
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
init_attr.cap.max_send_sge = 2;
init_attr.cap.max_recv_sge = 1;
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
init_attr.qp_type = IB_QPT_RC;
@ -701,86 +701,37 @@ int iser_post_recvm(struct iser_conn *ib_conn, int count)
}
/**
* iser_dto_to_iov - builds IOV from a dto descriptor
*/
static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
{
int i;
struct ib_sge *sge;
struct iser_regd_buf *regd_buf;
if (dto->regd_vector_len > iov_len) {
iser_err("iov size %d too small for posting dto of len %d\n",
iov_len, dto->regd_vector_len);
BUG();
}
for (i = 0; i < dto->regd_vector_len; i++) {
sge = &iov[i];
regd_buf = dto->regd[i];
sge->addr = regd_buf->reg.va;
sge->length = regd_buf->reg.len;
sge->lkey = regd_buf->reg.lkey;
if (dto->used_sz[i] > 0) /* Adjust size */
sge->length = dto->used_sz[i];
/* offset and length should not exceed the regd buf length */
if (sge->length + dto->offset[i] > regd_buf->reg.len) {
iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
"%ld in dto:0x%p [%d], va:0x%08lX\n",
(unsigned long)sge->length, dto->offset[i],
(unsigned long)regd_buf->reg.len, dto, i,
(unsigned long)sge->addr);
BUG();
}
sge->addr += dto->offset[i]; /* Adjust offset */
}
}
/**
* iser_start_send - Initiate a Send DTO operation
*
* returns 0 on success, -1 on failure
*/
int iser_post_send(struct iser_desc *tx_desc)
int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc)
{
int ib_ret, ret_val = 0;
int ib_ret;
struct ib_send_wr send_wr, *send_wr_failed;
struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
struct iser_conn *ib_conn;
struct iser_dto *dto = &tx_desc->dto;
ib_conn = dto->ib_conn;
iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
ib_dma_sync_single_for_device(ib_conn->device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
send_wr.next = NULL;
send_wr.wr_id = (unsigned long)tx_desc;
send_wr.sg_list = iov;
send_wr.num_sge = dto->regd_vector_len;
send_wr.sg_list = tx_desc->tx_sg;
send_wr.num_sge = tx_desc->num_sge;
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
send_wr.send_flags = IB_SEND_SIGNALED;
atomic_inc(&ib_conn->post_send_buf_count);
ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
if (ib_ret) {
iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
dto, dto->regd_vector_len);
iser_err("ib_post_send failed, ret:%d\n", ib_ret);
atomic_dec(&ib_conn->post_send_buf_count);
ret_val = -1;
}
return ret_val;
return ib_ret;
}
static void iser_handle_comp_error(struct iser_desc *desc,
static void iser_handle_comp_error(struct iser_tx_desc *desc,
struct iser_conn *ib_conn)
{
if (desc && desc->type == ISCSI_TX_DATAOUT)
@ -809,16 +760,16 @@ static int iser_drain_tx_cq(struct iser_device *device)
{
struct ib_cq *cq = device->tx_cq;
struct ib_wc wc;
struct iser_desc *tx_desc;
struct iser_tx_desc *tx_desc;
struct iser_conn *ib_conn;
int completed_tx = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
tx_desc = (struct iser_desc *) (unsigned long) wc.wr_id;
tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id;
ib_conn = wc.qp->qp_context;
if (wc.status == IB_WC_SUCCESS) {
if (wc.opcode == IB_WC_SEND)
iser_snd_completion(tx_desc);
iser_snd_completion(tx_desc, ib_conn);
else
iser_err("expected opcode %d got %d\n",
IB_WC_SEND, wc.opcode);