From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch converts ib_srpt to use existing percpu_ida tag
pre-allocation for struct srpt_send_ioctx.
This allows ib_srpt to drop it's internal pre-allocation
mechanisms with the extra spin_lock_irqsave, and use
percpu_ida common code for doing this.
Cc: Vu Pham <vu@xxxxxxxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/infiniband/ulp/srpt/ib_srpt.c | 55 +++++++++++------------------------
drivers/infiniband/ulp/srpt/ib_srpt.h | 2 --
2 files changed, 17 insertions(+), 40 deletions(-)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 72a671e..b0707a7 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1261,40 +1261,26 @@ free_mem:
*/
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
{
+ struct se_session *se_sess;
struct srpt_send_ioctx *ioctx;
- unsigned long flags;
+ int tag;
BUG_ON(!ch);
+ se_sess = ch->sess;
- 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);
+ tag = percpu_ida_alloc(&se_sess->sess_tag_pool, TASK_RUNNING);
+ if (tag < 0) {
+ pr_err("Unable to obtain tag for srpt_send_ioctx\n");
+ return NULL;
}
- spin_unlock_irqrestore(&ch->spinlock, flags);
-
- if (!ioctx)
- return ioctx;
-
- BUG_ON(ioctx->ch != ch);
+ ioctx = &((struct srpt_send_ioctx *)se_sess->sess_cmd_map)[tag];
+ memset(ioctx, 0, sizeof(struct srpt_send_ioctx));
+ ioctx->ch = ch;
spin_lock_init(&ioctx->spinlock);
ioctx->state = SRPT_STATE_NEW;
- ioctx->n_rbuf = 0;
- ioctx->rbufs = NULL;
- ioctx->n_rdma = 0;
- ioctx->n_rdma_wrs = 0;
- ioctx->rdma_wrs = NULL;
- ioctx->mapped_sg_count = 0;
init_completion(&ioctx->tx_done);
- ioctx->queue_status_only = false;
- /*
- * transport_init_se_cmd() does not initialize all fields, so do it
- * here.
- */
- memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
- memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
+
+ ioctx->cmd.map_tag = tag;
return ioctx;
}
@@ -2241,7 +2227,7 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
struct ib_cm_rep_param *rep_param;
struct srpt_rdma_ch *ch, *tmp_ch;
u32 it_iu_len;
- int i, ret = 0;
+ int ret = 0;
unsigned char *p;
WARN_ON_ONCE(irqs_disabled());
@@ -2370,12 +2356,6 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
if (!ch->ioctx_ring)
goto free_ch;
- INIT_LIST_HEAD(&ch->free_list);
- 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);
- }
-
ret = srpt_create_ch_ib(ch);
if (ret) {
rej->reason = cpu_to_be32(
@@ -2406,7 +2386,8 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
p = &ch->sess_name[0];
try_again:
- ch->sess = target_alloc_session(&sport->port_tpg_1, 0, 0,
+ ch->sess = target_alloc_session(&sport->port_tpg_1, ch->rq_size,
+ sizeof(struct srpt_send_ioctx),
TARGET_PROT_NORMAL, p, ch, NULL);
if (IS_ERR(ch->sess)) {
pr_info("Rejected login because no ACL has been"
@@ -3194,7 +3175,7 @@ static void srpt_release_cmd(struct se_cmd *se_cmd)
struct srpt_send_ioctx *ioctx = container_of(se_cmd,
struct srpt_send_ioctx, cmd);
struct srpt_rdma_ch *ch = ioctx->ch;
- unsigned long flags;
+ struct se_session *se_sess = ch->sess;
WARN_ON(ioctx->state != SRPT_STATE_DONE);
WARN_ON(ioctx->mapped_sg_count != 0);
@@ -3205,9 +3186,7 @@ static void srpt_release_cmd(struct se_cmd *se_cmd)
ioctx->n_rbuf = 0;
}
- spin_lock_irqsave(&ch->spinlock, flags);
- list_add(&ioctx->free_list, &ch->free_list);
- spin_unlock_irqrestore(&ch->spinlock, flags);
+ percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
}
/**
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
index 09037f2..6fbb6e7 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.h
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -179,7 +179,6 @@ struct srpt_recv_ioctx {
* struct srpt_send_ioctx - SRPT send I/O context.
* @ioctx: See above.
* @ch: Channel pointer.
- * @free_list: Node in srpt_rdma_ch.free_list.
* @n_rbuf: Number of data buffers in the received SRP command.
* @rbufs: Pointer to SRP data buffer array.
* @single_rbuf: SRP data buffer if the command has only a single buffer.
@@ -202,7 +201,6 @@ struct srpt_send_ioctx {
struct srp_direct_buf *rbufs;
struct srp_direct_buf single_rbuf;
struct scatterlist *sg;
- struct list_head free_list;
spinlock_t spinlock;
enum srpt_command_state state;
struct se_cmd cmd;
--
1.9.1
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