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scsi: RDMA/srpt: Rework I/O context allocation 

Instead of maintaining a list of free I/O contexts, use an sbitmap data
structure to track which I/O contexts are in use and which are free. This
makes the ib_srpt driver more consistent with other LIO drivers.

Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2019-01-25 10:34:50 -08:00 committed by Martin K. Petersen
parent 337ec69ed7
commit fd1b668709
2 changed files with 19 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -1217,22 +1217,15 @@ static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
{
struct srpt_send_ioctx *ioctx;
unsigned long flags;
int tag, cpu;
BUG_ON(!ch);
ioctx = NULL;
spin_lock_irqsave(&ch->spinlock, flags);
if (!list_empty(&ch->free_list)) {
ioctx = list_first_entry(&ch->free_list,
struct srpt_send_ioctx, free_list);
list_del(&ioctx->free_list);
}
spin_unlock_irqrestore(&ch->spinlock, flags);
if (!ioctx)
return ioctx;
tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu);
if (tag < 0)
return NULL;
ioctx = ch->ioctx_ring[tag];
BUG_ON(ioctx->ch != ch);
ioctx->state = SRPT_STATE_NEW;
WARN_ON_ONCE(ioctx->recv_ioctx);
@ -1245,6 +1238,8 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
*/
memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
ioctx->cmd.map_tag = tag;
ioctx->cmd.map_cpu = cpu;
return ioctx;
}
@ -2148,7 +2143,7 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
struct srpt_rdma_ch *ch = NULL;
char i_port_id[36];
u32 it_iu_len;
int i, ret;
int i, tag_num, tag_size, ret;
WARN_ON_ONCE(irqs_disabled());
@ -2248,11 +2243,8 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
goto free_rsp_cache;
}
INIT_LIST_HEAD(&ch->free_list);
for (i = 0; i < ch->rq_size; i++) {
for (i = 0; i < ch->rq_size; i++)
ch->ioctx_ring[i]->ch = ch;
list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
}
if (!sdev->use_srq) {
u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ?
be16_to_cpu(req->imm_data_offset) : 0;
@ -2306,18 +2298,20 @@ static int srpt_cm_req_recv(struct srpt_device *const sdev,
pr_debug("registering session %s\n", ch->sess_name);
tag_num = ch->rq_size;
tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */
if (sport->port_guid_tpg.se_tpg_wwn)
ch->sess = target_setup_session(&sport->port_guid_tpg, 0, 0,
TARGET_PROT_NORMAL,
ch->sess = target_setup_session(&sport->port_guid_tpg, tag_num,
tag_size, TARGET_PROT_NORMAL,
ch->sess_name, ch, NULL);
if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0,
TARGET_PROT_NORMAL, i_port_id, ch,
NULL);
ch->sess = target_setup_session(&sport->port_gid_tpg, tag_num,
tag_size, TARGET_PROT_NORMAL, i_port_id,
ch, NULL);
/* Retry without leading "0x" */
if (sport->port_gid_tpg.se_tpg_wwn && IS_ERR_OR_NULL(ch->sess))
ch->sess = target_setup_session(&sport->port_gid_tpg, 0, 0,
TARGET_PROT_NORMAL,
ch->sess = target_setup_session(&sport->port_gid_tpg, tag_num,
tag_size, TARGET_PROT_NORMAL,
i_port_id + 2, ch, NULL);
if (IS_ERR_OR_NULL(ch->sess)) {
WARN_ON_ONCE(ch->sess == NULL);
@ -3279,7 +3273,6 @@ static void srpt_release_cmd(struct se_cmd *se_cmd)
struct srpt_send_ioctx, cmd);
struct srpt_rdma_ch *ch = ioctx->ch;
struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx;
unsigned long flags;
WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
!(ioctx->cmd.transport_state & CMD_T_ABORTED));
@ -3295,9 +3288,7 @@ static void srpt_release_cmd(struct se_cmd *se_cmd)
ioctx->n_rw_ctx = 0;
}
spin_lock_irqsave(&ch->spinlock, flags);
list_add(&ioctx->free_list, &ch->free_list);
spin_unlock_irqrestore(&ch->spinlock, flags);
target_free_tag(se_cmd->se_sess, se_cmd);
}
/**

4
drivers/infiniband/ulp/srpt/ib_srpt.h
View File

@ -207,7 +207,6 @@ struct srpt_rw_ctx {
* @rw_ctxs: RDMA read/write contexts.
* @imm_sg: Scatterlist for immediate data.
* @rdma_cqe: RDMA completion queue element.
* @free_list: Node in srpt_rdma_ch.free_list.
* @state: I/O context state.
* @cmd: Target core command data structure.
* @sense_data: SCSI sense data.
@ -227,7 +226,6 @@ struct srpt_send_ioctx {
struct scatterlist imm_sg;
struct ib_cqe rdma_cqe;
struct list_head free_list;
enum srpt_command_state state;
struct se_cmd cmd;
u8 n_rdma;
@ -277,7 +275,6 @@ enum rdma_ch_state {
* @req_lim_delta: Number of credits not yet sent back to the initiator.
* @imm_data_offset: Offset from start of SRP_CMD for immediate data.
* @spinlock: Protects free_list and state.
* @free_list: Head of list with free send I/O contexts.
* @state: channel state. See also enum rdma_ch_state.
* @using_rdma_cm: Whether the RDMA/CM or IB/CM is used for this channel.
* @processing_wait_list: Whether or not cmd_wait_list is being processed.
@ -318,7 +315,6 @@ struct srpt_rdma_ch {
atomic_t req_lim_delta;
u16 imm_data_offset;
spinlock_t spinlock;
struct list_head free_list;
enum rdma_ch_state state;
struct kmem_cache *rsp_buf_cache;
struct srpt_send_ioctx **ioctx_ring;