From 0fd10721fe3664f7549e74af9d28a509c9a68719 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Fri, 29 Jan 2016 22:47:58 -0800 Subject: [PATCH] ib_srpt: Convert to percpu_ida tag allocation 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 Cc: Sagi Grimberg Cc: Bart Van Assche Signed-off-by: Nicholas Bellinger --- 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 72a671ed0b46..b0707a7aac02 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 09037f2b0b51..6fbb6e79407c 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; -- 2.39.5