dect/linux-2.6
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Merge branch 'iser' into for-next

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This commit is contained in:
Roland Dreier 2010-03-01 23:51:56 -08:00
commit 5c2187f0a1
5 changed files with 405 additions and 618 deletions
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47
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;
}
@ -168,7 +190,7 @@ iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
{
int error = 0;
iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt);
iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
error = iser_send_control(conn, task);
@ -178,9 +200,6 @@ iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
* - if yes, the task is recycled at iscsi_complete_pdu
* - if no, the task is recycled at iser_snd_completion
*/
if (error && error != -ENOBUFS)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return error;
}
@ -232,7 +251,7 @@ iscsi_iser_task_xmit(struct iscsi_task *task)
task->imm_count, task->unsol_r2t.data_length);
}
iser_dbg("task deq [cid %d itt 0x%x]\n",
iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
conn->id, task->itt);
/* Send the cmd PDU */
@ -248,8 +267,6 @@ iscsi_iser_task_xmit(struct iscsi_task *task)
error = iscsi_iser_task_xmit_unsol_data(conn, task);
iscsi_iser_task_xmit_exit:
if (error && error != -ENOBUFS)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return error;
}
@ -283,7 +300,7 @@ iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
* due to issues with the login code re iser sematics
* this not set in iscsi_conn_setup - FIXME
*/
conn->max_recv_dlength = 128;
conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
iser_conn = conn->dd_data;
conn->dd_data = iser_conn;
@ -401,7 +418,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
struct Scsi_Host *shost;
struct iser_conn *ib_conn;
shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
if (!shost)
return NULL;
shost->transportt = iscsi_iser_scsi_transport;
@ -675,7 +692,7 @@ 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)

97
drivers/infiniband/ulp/iser/iscsi_iser.h
View file

@ -102,9 +102,9 @@
#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
* SCSI_TMFUNC(2), LOGOUT(1) */
#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
ISER_MAX_RX_MISC_PDUS + \
ISER_MAX_TX_MISC_PDUS)
#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
#define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
/* the max TX (send) WR supported by the iSER QP is defined by *
* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
@ -132,6 +132,12 @@ struct iser_hdr {
__be64 read_va;
} __attribute__((packed));
/* Constant PDU lengths calculations */
#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
#define ISER_RECV_DATA_SEG_LEN 128
#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
/* Length of an object name string */
#define ISER_OBJECT_NAME_SIZE 64
@ -187,51 +193,43 @@ 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 {
ISCSI_RX,
ISCSI_TX_CONTROL ,
ISCSI_TX_SCSI_COMMAND,
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 + \
sizeof(u64) + sizeof(struct ib_sge)))
struct iser_rx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
char data[ISER_RECV_DATA_SEG_LEN];
u64 dma_addr;
struct ib_sge rx_sg;
char pad[ISER_RX_PAD_SIZE];
} __attribute__((packed));
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
struct ib_cq *cq;
struct ib_cq *rx_cq;
struct ib_cq *tx_cq;
struct ib_mr *mr;
struct tasklet_struct cq_tasklet;
struct list_head ig_list; /* entry in ig devices list */
@ -250,15 +248,18 @@ struct iser_conn {
struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
int disc_evt_flag; /* disconn event delivered */
wait_queue_head_t wait; /* waitq for conn/disconn */
atomic_t post_recv_buf_count; /* posted rx count */
int post_recv_buf_count; /* posted rx count */
atomic_t post_send_buf_count; /* posted tx count */
atomic_t unexpected_pdu_count;/* count of received *
* unexpected pdus *
* not yet retired */
char name[ISER_OBJECT_NAME_SIZE];
struct iser_page_vec *page_vec; /* represents SG to fmr maps*
* maps serialized as tx is*/
struct list_head conn_list; /* entry in ig conn list */
char *login_buf;
u64 login_dma;
unsigned int rx_desc_head;
struct iser_rx_desc *rx_descs;
struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
};
struct iscsi_iser_conn {
@ -267,7 +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 */
@ -275,6 +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 {
@ -322,22 +324,17 @@ void iser_conn_put(struct iser_conn *ib_conn);
void iser_conn_terminate(struct iser_conn *ib_conn);
void iser_rcv_completion(struct iser_desc *desc,
unsigned long dto_xfer_len);
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_reg_single(struct iser_device *device,
struct iser_regd_buf *regd_buf,
enum dma_data_direction direction);
void iser_free_rx_descriptors(struct iser_conn *ib_conn);
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
enum iser_data_dir cmd_dir);
@ -356,11 +353,9 @@ int iser_reg_page_vec(struct iser_conn *ib_conn,
void iser_unreg_mem(struct iser_mem_reg *mem_reg);
int iser_post_recv(struct iser_desc *rx_desc);
int iser_post_send(struct iser_desc *tx_desc);
int iser_conn_state_comp(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp);
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_conn *ib_conn, struct iser_tx_desc *tx_desc);
int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data,
@ -368,4 +363,6 @@ 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

528
drivers/infiniband/ulp/iser/iser_initiator.c
View file

@ -39,29 +39,6 @@
#include "iscsi_iser.h"
/* Constant PDU lengths calculations */
#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
sizeof (struct iscsi_hdr))
/* 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
@ -122,9 +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,
@ -163,135 +140,100 @@ 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;
}
/**
* iser_post_receive_control - allocates, initializes and posts receive DTO.
*/
static int iser_post_receive_control(struct iscsi_conn *conn)
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
struct iser_desc *rx_desc;
struct iser_regd_buf *regd_hdr;
struct iser_regd_buf *regd_data;
struct iser_dto *recv_dto = NULL;
struct iser_device *device = iser_conn->ib_conn->device;
int rx_data_size, err;
int posts, outstanding_unexp_pdus;
/* for the login sequence we must support rx of upto 8K; login is done
* after conn create/bind (connect) and conn stop/bind (reconnect),
* what's common for both schemes is that the connection is not started
*/
if (conn->c_stage != ISCSI_CONN_STARTED)
rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
else /* FIXME till user space sets conn->max_recv_dlength correctly */
rx_data_size = 128;
outstanding_unexp_pdus =
atomic_xchg(&iser_conn->ib_conn->unexpected_pdu_count, 0);
/*
* in addition to the response buffer, replace those consumed by
* unexpected pdus.
*/
for (posts = 0; posts < 1 + outstanding_unexp_pdus; posts++) {
rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
if (rx_desc == NULL) {
iser_err("Failed to alloc desc for post recv %d\n",
posts);
err = -ENOMEM;
goto post_rx_cache_alloc_failure;
}
rx_desc->type = ISCSI_RX;
rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
if (rx_desc->data == NULL) {
iser_err("Failed to alloc data buf for post recv %d\n",
posts);
err = -ENOMEM;
goto post_rx_kmalloc_failure;
}
recv_dto = &rx_desc->dto;
recv_dto->ib_conn = iser_conn->ib_conn;
recv_dto->regd_vector_len = 0;
regd_hdr = &rx_desc->hdr_regd_buf;
memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
regd_hdr->device = device;
regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
regd_data = &rx_desc->data_regd_buf;
memset(regd_data, 0, sizeof(struct iser_regd_buf));
regd_data->device = device;
regd_data->virt_addr = rx_desc->data;
regd_data->data_size = rx_data_size;
iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
err = iser_post_recv(rx_desc);
if (err) {
iser_err("Failed iser_post_recv for post %d\n", posts);
goto post_rx_post_recv_failure;
}
}
/* all posts successful */
return 0;
post_rx_post_recv_failure:
iser_dto_buffs_release(recv_dto);
kfree(rx_desc->data);
post_rx_kmalloc_failure:
kmem_cache_free(ig.desc_cache, rx_desc);
post_rx_cache_alloc_failure:
if (posts > 0) {
/*
* response buffer posted, but did not replace all unexpected
* pdu recv bufs. Ignore error, retry occurs next send
*/
outstanding_unexp_pdus -= (posts - 1);
err = 0;
}
atomic_add(outstanding_unexp_pdus,
&iser_conn->ib_conn->unexpected_pdu_count);
return err;
}
/* 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_TOTAL_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;
u64 dma_addr;
struct iser_rx_desc *rx_desc;
struct ib_sge *rx_sg;
struct iser_device *device = ib_conn->device;
ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
sizeof(struct iser_rx_desc), GFP_KERNEL);
if (!ib_conn->rx_descs)
goto rx_desc_alloc_fail;
rx_desc = ib_conn->rx_descs;
for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) {
dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr))
goto rx_desc_dma_map_failed;
rx_desc->dma_addr = dma_addr;
rx_sg = &rx_desc->rx_sg;
rx_sg->addr = rx_desc->dma_addr;
rx_sg->length = ISER_RX_PAYLOAD_SIZE;
rx_sg->lkey = device->mr->lkey;
}
ib_conn->rx_desc_head = 0;
return 0;
rx_desc_dma_map_failed:
rx_desc = ib_conn->rx_descs;
for (j = 0; j < i; j++, rx_desc++)
ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
kfree(ib_conn->rx_descs);
ib_conn->rx_descs = NULL;
rx_desc_alloc_fail:
iser_err("failed allocating rx descriptors / data buffers\n");
return -ENOMEM;
}
void iser_free_rx_descriptors(struct iser_conn *ib_conn)
{
int i;
struct iser_rx_desc *rx_desc;
struct iser_device *device = ib_conn->device;
if (ib_conn->login_buf) {
ib_dma_unmap_single(device->ib_device, ib_conn->login_dma,
ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
kfree(ib_conn->login_buf);
}
if (!ib_conn->rx_descs)
return;
rx_desc = ib_conn->rx_descs;
for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
kfree(ib_conn->rx_descs);
}
/**
@ -301,46 +243,23 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
int i;
/*
* FIXME this value should be declared to the target during login with
* the MaxOutstandingUnexpectedPDUs key when supported
*/
int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
/* Check that there is no posted recv or send buffers left - */
/* they must be consumed during the login phase */
BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0);
BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
if (iser_alloc_rx_descriptors(iser_conn->ib_conn))
return -ENOMEM;
/* Initial post receive buffers */
for (i = 0; i < initial_post_recv_bufs_num; i++) {
if (iser_post_receive_control(conn) != 0) {
iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
i, conn);
return -ENOMEM;
}
}
iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
return -ENOMEM;
return 0;
}
static int
iser_check_xmit(struct iscsi_conn *conn, void *task)
{
struct iscsi_iser_conn *iser_conn = conn->dd_data;
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
ISER_QP_MAX_REQ_DTOS) {
iser_dbg("%ld can't xmit task %p\n",jiffies,task);
return -ENOBUFS;
}
return 0;
}
/**
* iser_send_command - send command PDU
*/
@ -349,27 +268,18 @@ 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 = 0;
int err;
struct iser_data_buf *data_buf;
struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr;
struct scsi_cmnd *sc = task->sc;
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);
return -EPERM;
}
if (iser_check_xmit(conn, task))
return -ENOBUFS;
struct iser_tx_desc *tx_desc = &iser_task->desc;
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];
@ -398,23 +308,13 @@ 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);
if (iser_post_receive_control(conn) != 0) {
iser_err("post_recv failed!\n");
err = -ENOMEM;
goto send_command_error;
}
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;
}
@ -428,20 +328,13 @@ 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;
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);
return -EPERM;
}
if (iser_check_xmit(conn, task))
return -ENOBUFS;
struct ib_sge *tx_dsg;
itt = (__force uint32_t)hdr->itt;
data_seg_len = ntoh24(hdr->dlength);
@ -450,28 +343,25 @@ 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_ATOMIC);
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 "
@ -485,12 +375,11 @@ 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;
@ -501,64 +390,44 @@ 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 = 0;
struct iser_regd_buf *regd_buf;
struct iser_device *device;
unsigned char opcode;
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);
return -EPERM;
}
if (iser_check_xmit(conn, task))
return -ENOBUFS;
/* 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);
}
opcode = task->hdr->opcode & ISCSI_OPCODE_MASK;
/* post recv buffer for response if one is expected */
if (!(opcode == ISCSI_OP_NOOP_OUT && task->hdr->itt == RESERVED_ITT)) {
if (iser_post_receive_control(conn) != 0) {
iser_err("post_rcv_buff failed!\n");
err = -ENOMEM;
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;
}
err = iser_post_send(mdesc);
if (task == conn->login_task) {
err = iser_post_recvl(iser_conn->ib_conn);
if (err)
goto send_control_error;
}
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;
}
@ -566,104 +435,71 @@ send_control_error:
/**
* iser_rcv_dto_completion - recv DTO completion
*/
void iser_rcv_completion(struct iser_desc *rx_desc,
unsigned long dto_xfer_len)
void iser_rcv_completion(struct iser_rx_desc *rx_desc,
unsigned long rx_xfer_len,
struct iser_conn *ib_conn)
{
struct iser_dto *dto = &rx_desc->dto;
struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn;
struct iscsi_task *task;
struct iscsi_iser_task *iser_task;
struct iscsi_iser_conn *conn = ib_conn->iser_conn;
struct iscsi_hdr *hdr;
char *rx_data = NULL;
int rx_data_len = 0;
unsigned char opcode;
u64 rx_dma;
int rx_buflen, outstanding, count, err;
/* differentiate between login to all other PDUs */
if ((char *)rx_desc == ib_conn->login_buf) {
rx_dma = ib_conn->login_dma;
rx_buflen = ISER_RX_LOGIN_SIZE;
} else {
rx_dma = rx_desc->dma_addr;
rx_buflen = ISER_RX_PAYLOAD_SIZE;
}
ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
rx_buflen, DMA_FROM_DEVICE);
hdr = &rx_desc->iscsi_header;
iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
rx_data = dto->regd[1]->virt_addr;
rx_data += dto->offset[1];
}
iscsi_iser_recv(conn->iscsi_conn, hdr,
rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
spin_lock(&conn->iscsi_conn->session->lock);
task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt);
if (task)
__iscsi_get_task(task);
spin_unlock(&conn->iscsi_conn->session->lock);
if (!task)
iser_err("itt can't be matched to task!!! "
"conn %p opcode %d itt %d\n",
conn->iscsi_conn, opcode, hdr->itt);
else {
iser_task = task->dd_data;
iser_dbg("itt %d task %p\n",hdr->itt, task);
iser_task->status = ISER_TASK_STATUS_COMPLETED;
iser_task_rdma_finalize(iser_task);
iscsi_put_task(task);
}
}
iser_dto_buffs_release(dto);
iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
kfree(rx_desc->data);
kmem_cache_free(ig.desc_cache, rx_desc);
ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
rx_buflen, DMA_FROM_DEVICE);
/* decrementing conn->post_recv_buf_count only --after-- freeing the *
* task eliminates the need to worry on tasks which are completed in *
* parallel to the execution of iser_conn_term. So the code that waits *
* for the posted rx bufs refcount to become zero handles everything */
atomic_dec(&conn->ib_conn->post_recv_buf_count);
conn->ib_conn->post_recv_buf_count--;
/*
* if an unexpected PDU was received then the recv wr consumed must
* be replaced, this is done in the next send of a control-type PDU
*/
if (opcode == ISCSI_OP_NOOP_IN && hdr->itt == RESERVED_ITT) {
/* nop-in with itt = 0xffffffff */
atomic_inc(&conn->ib_conn->unexpected_pdu_count);
if (rx_dma == ib_conn->login_dma)
return;
outstanding = ib_conn->post_recv_buf_count;
if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
ISER_MIN_POSTED_RX);
err = iser_post_recvm(ib_conn, count);
if (err)
iser_err("posting %d rx bufs err %d\n", count, err);
}
else if (opcode == ISCSI_OP_ASYNC_EVENT) {
/* asyncronous message */
atomic_inc(&conn->ib_conn->unexpected_pdu_count);
}
/* a reject PDU consumes the recv buf posted for the response */
}
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)
resume_tx = 1;
}
atomic_dec(&ib_conn->post_send_buf_count);
if (resume_tx) {
iser_dbg("%ld resuming tx\n",jiffies);
iscsi_conn_queue_work(conn);
}
if (tx_desc->type == ISCSI_TX_CONTROL) {
/* this arithmetic is legal by libiscsi dd_data allocation */
task = (void *) ((long)(void *)tx_desc -
@ -692,7 +528,6 @@ 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;
@ -710,32 +545,17 @@ 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]);
}

64
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
*/
@ -109,10 +53,10 @@ static int iser_start_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
unsigned long cmd_data_len = data->data_len;
if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
mem = (void *)__get_free_pages(GFP_NOIO,
mem = (void *)__get_free_pages(GFP_ATOMIC,
ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
else
mem = kmalloc(cmd_data_len, GFP_NOIO);
mem = kmalloc(cmd_data_len, GFP_ATOMIC);
if (mem == NULL) {
iser_err("Failed to allocate mem size %d %d for copying sglist\n",
@ -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;
}

287
drivers/infiniband/ulp/iser/iser_verbs.c
View file

@ -37,9 +37,8 @@
#include "iscsi_iser.h"
#define ISCSI_ISER_MAX_CONN 8
#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
ISER_QP_MAX_REQ_DTOS) * \
ISCSI_ISER_MAX_CONN)
#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
static void iser_cq_tasklet_fn(unsigned long data);
static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
@ -67,15 +66,23 @@ static int iser_create_device_ib_res(struct iser_device *device)
if (IS_ERR(device->pd))
goto pd_err;
device->cq = ib_create_cq(device->ib_device,
device->rx_cq = ib_create_cq(device->ib_device,
iser_cq_callback,
iser_cq_event_callback,
(void *)device,
ISER_MAX_CQ_LEN, 0);
if (IS_ERR(device->cq))
goto cq_err;
ISER_MAX_RX_CQ_LEN, 0);
if (IS_ERR(device->rx_cq))
goto rx_cq_err;
if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
device->tx_cq = ib_create_cq(device->ib_device,
NULL, iser_cq_event_callback,
(void *)device,
ISER_MAX_TX_CQ_LEN, 0);
if (IS_ERR(device->tx_cq))
goto tx_cq_err;
if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP))
goto cq_arm_err;
tasklet_init(&device->cq_tasklet,
@ -93,8 +100,10 @@ static int iser_create_device_ib_res(struct iser_device *device)
dma_mr_err:
tasklet_kill(&device->cq_tasklet);
cq_arm_err:
ib_destroy_cq(device->cq);
cq_err:
ib_destroy_cq(device->tx_cq);
tx_cq_err:
ib_destroy_cq(device->rx_cq);
rx_cq_err:
ib_dealloc_pd(device->pd);
pd_err:
iser_err("failed to allocate an IB resource\n");
@ -112,11 +121,13 @@ static void iser_free_device_ib_res(struct iser_device *device)
tasklet_kill(&device->cq_tasklet);
(void)ib_dereg_mr(device->mr);
(void)ib_destroy_cq(device->cq);
(void)ib_destroy_cq(device->tx_cq);
(void)ib_destroy_cq(device->rx_cq);
(void)ib_dealloc_pd(device->pd);
device->mr = NULL;
device->cq = NULL;
device->tx_cq = NULL;
device->rx_cq = NULL;
device->pd = NULL;
}
@ -129,13 +140,23 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
{
struct iser_device *device;
struct ib_qp_init_attr init_attr;
int ret;
int ret = -ENOMEM;
struct ib_fmr_pool_param params;
BUG_ON(ib_conn->device == NULL);
device = ib_conn->device;
ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!ib_conn->login_buf) {
goto alloc_err;
ret = -ENOMEM;
}
ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device,
(void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE,
DMA_FROM_DEVICE);
ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
(sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
GFP_KERNEL);
@ -169,12 +190,12 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
init_attr.event_handler = iser_qp_event_callback;
init_attr.qp_context = (void *)ib_conn;
init_attr.send_cq = device->cq;
init_attr.recv_cq = device->cq;
init_attr.send_cq = device->tx_cq;
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_recv_sge = 2;
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;
@ -192,6 +213,7 @@ qp_err:
(void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
fmr_pool_err:
kfree(ib_conn->page_vec);
kfree(ib_conn->login_buf);
alloc_err:
iser_err("unable to alloc mem or create resource, err %d\n", ret);
return ret;
@ -278,17 +300,6 @@ static void iser_device_try_release(struct iser_device *device)
mutex_unlock(&ig.device_list_mutex);
}
int iser_conn_state_comp(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp)
{
int ret;
spin_lock_bh(&ib_conn->lock);
ret = (ib_conn->state == comp);
spin_unlock_bh(&ib_conn->lock);
return ret;
}
static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
enum iser_ib_conn_state comp,
enum iser_ib_conn_state exch)
@ -314,7 +325,7 @@ static void iser_conn_release(struct iser_conn *ib_conn)
mutex_lock(&ig.connlist_mutex);
list_del(&ib_conn->conn_list);
mutex_unlock(&ig.connlist_mutex);
iser_free_rx_descriptors(ib_conn);
iser_free_ib_conn_res(ib_conn);
ib_conn->device = NULL;
/* on EVENT_ADDR_ERROR there's no device yet for this conn */
@ -442,7 +453,7 @@ static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
ISCSI_ERR_CONN_FAILED);
/* Complete the termination process if no posts are pending */
if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
if (ib_conn->post_recv_buf_count == 0 &&
(atomic_read(&ib_conn->post_send_buf_count) == 0)) {
ib_conn->state = ISER_CONN_DOWN;
wake_up_interruptible(&ib_conn->wait);
@ -489,9 +500,8 @@ void iser_conn_init(struct iser_conn *ib_conn)
{
ib_conn->state = ISER_CONN_INIT;
init_waitqueue_head(&ib_conn->wait);
atomic_set(&ib_conn->post_recv_buf_count, 0);
ib_conn->post_recv_buf_count = 0;
atomic_set(&ib_conn->post_send_buf_count, 0);
atomic_set(&ib_conn->unexpected_pdu_count, 0);
atomic_set(&ib_conn->refcount, 1);
INIT_LIST_HEAD(&ib_conn->conn_list);
spin_lock_init(&ib_conn->lock);
@ -626,136 +636,97 @@ void iser_unreg_mem(struct iser_mem_reg *reg)
reg->mem_h = NULL;
}
/**
* 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 iser_post_recvl(struct iser_conn *ib_conn)
{
int i;
struct ib_sge *sge;
struct iser_regd_buf *regd_buf;
struct ib_recv_wr rx_wr, *rx_wr_failed;
struct ib_sge sge;
int ib_ret;
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();
}
sge.addr = ib_conn->login_dma;
sge.length = ISER_RX_LOGIN_SIZE;
sge.lkey = ib_conn->device->mr->lkey;
for (i = 0; i < dto->regd_vector_len; i++) {
sge = &iov[i];
regd_buf = dto->regd[i];
rx_wr.wr_id = (unsigned long)ib_conn->login_buf;
rx_wr.sg_list = &sge;
rx_wr.num_sge = 1;
rx_wr.next = NULL;
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_post_recv - Posts a receive buffer.
*
* returns 0 on success, -1 on failure
*/
int iser_post_recv(struct iser_desc *rx_desc)
{
int ib_ret, ret_val = 0;
struct ib_recv_wr recv_wr, *recv_wr_failed;
struct ib_sge iov[2];
struct iser_conn *ib_conn;
struct iser_dto *recv_dto = &rx_desc->dto;
/* Retrieve conn */
ib_conn = recv_dto->ib_conn;
iser_dto_to_iov(recv_dto, iov, 2);
recv_wr.next = NULL;
recv_wr.sg_list = iov;
recv_wr.num_sge = recv_dto->regd_vector_len;
recv_wr.wr_id = (unsigned long)rx_desc;
atomic_inc(&ib_conn->post_recv_buf_count);
ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
ib_conn->post_recv_buf_count++;
ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
atomic_dec(&ib_conn->post_recv_buf_count);
ret_val = -1;
ib_conn->post_recv_buf_count--;
}
return ib_ret;
}
int iser_post_recvm(struct iser_conn *ib_conn, int count)
{
struct ib_recv_wr *rx_wr, *rx_wr_failed;
int i, ib_ret;
unsigned int my_rx_head = ib_conn->rx_desc_head;
struct iser_rx_desc *rx_desc;
for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
rx_desc = &ib_conn->rx_descs[my_rx_head];
rx_wr->wr_id = (unsigned long)rx_desc;
rx_wr->sg_list = &rx_desc->rx_sg;
rx_wr->num_sge = 1;
rx_wr->next = rx_wr + 1;
my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1);
}
return ret_val;
rx_wr--;
rx_wr->next = NULL; /* mark end of work requests list */
ib_conn->post_recv_buf_count += count;
ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
ib_conn->post_recv_buf_count -= count;
} else
ib_conn->rx_desc_head = my_rx_head;
return ib_ret;
}
/**
* 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)
{
struct iser_dto *dto = &desc->dto;
struct iser_conn *ib_conn = dto->ib_conn;
iser_dto_buffs_release(dto);
if (desc->type == ISCSI_RX) {
kfree(desc->data);
if (desc && desc->type == ISCSI_TX_DATAOUT)
kmem_cache_free(ig.desc_cache, desc);
atomic_dec(&ib_conn->post_recv_buf_count);
} else { /* type is TX control/command/dataout */
if (desc->type == ISCSI_TX_DATAOUT)
kmem_cache_free(ig.desc_cache, desc);
atomic_dec(&ib_conn->post_send_buf_count);
}
if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
if (ib_conn->post_recv_buf_count == 0 &&
atomic_read(&ib_conn->post_send_buf_count) == 0) {
/* getting here when the state is UP means that the conn is *
* being terminated asynchronously from the iSCSI layer's *
@ -774,32 +745,74 @@ static void iser_handle_comp_error(struct iser_desc *desc)
}
}
static int iser_drain_tx_cq(struct iser_device *device)
{
struct ib_cq *cq = device->tx_cq;
struct ib_wc wc;
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_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, ib_conn);
else
iser_err("expected opcode %d got %d\n",
IB_WC_SEND, wc.opcode);
} else {
iser_err("tx id %llx status %d vend_err %x\n",
wc.wr_id, wc.status, wc.vendor_err);
atomic_dec(&ib_conn->post_send_buf_count);
iser_handle_comp_error(tx_desc, ib_conn);
}
completed_tx++;
}
return completed_tx;
}
static void iser_cq_tasklet_fn(unsigned long data)
{
struct iser_device *device = (struct iser_device *)data;
struct ib_cq *cq = device->cq;
struct ib_cq *cq = device->rx_cq;
struct ib_wc wc;
struct iser_desc *desc;
struct iser_rx_desc *desc;
unsigned long xfer_len;
struct iser_conn *ib_conn;
int completed_tx, completed_rx;
completed_tx = completed_rx = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
desc = (struct iser_desc *) (unsigned long) wc.wr_id;
desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id;
BUG_ON(desc == NULL);
ib_conn = wc.qp->qp_context;
if (wc.status == IB_WC_SUCCESS) {
if (desc->type == ISCSI_RX) {
if (wc.opcode == IB_WC_RECV) {
xfer_len = (unsigned long)wc.byte_len;
iser_rcv_completion(desc, xfer_len);
} else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
iser_snd_completion(desc);
iser_rcv_completion(desc, xfer_len, ib_conn);
} else
iser_err("expected opcode %d got %d\n",
IB_WC_RECV, wc.opcode);
} else {
iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
iser_handle_comp_error(desc);
if (wc.status != IB_WC_WR_FLUSH_ERR)
iser_err("rx id %llx status %d vend_err %x\n",
wc.wr_id, wc.status, wc.vendor_err);
ib_conn->post_recv_buf_count--;
iser_handle_comp_error(NULL, ib_conn);
}
completed_rx++;
if (!(completed_rx & 63))
completed_tx += iser_drain_tx_cq(device);
}
/* #warning "it is assumed here that arming CQ only once its empty" *
* " would not cause interrupts to be missed" */
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
completed_tx += iser_drain_tx_cq(device);
iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx);
}
static void iser_cq_callback(struct ib_cq *cq, void *cq_context)