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IB/srpt: Cache global L_Key

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This patch is a micro-optimization for the hot path.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2017-10-11 10:27:24 -07:00 committed by Doug Ledford
parent 7a01d05cd5
commit 74333f1223
2 changed files with 6 additions and 3 deletions
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6
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -766,7 +766,7 @@ static int srpt_post_recv(struct srpt_device *sdev,
BUG_ON(!sdev);
list.addr = ioctx->ioctx.dma;
list.length = srp_max_req_size;
list.lkey = sdev->pd->local_dma_lkey;
list.lkey = sdev->lkey;
ioctx->ioctx.cqe.done = srpt_recv_done;
wr.wr_cqe = &ioctx->ioctx.cqe;
@ -2343,7 +2343,7 @@ static void srpt_queue_response(struct se_cmd *cmd)
sge.addr = ioctx->ioctx.dma;
sge.length = resp_len;
sge.lkey = sdev->pd->local_dma_lkey;
sge.lkey = sdev->lkey;
ioctx->ioctx.cqe.done = srpt_send_done;
send_wr.next = NULL;
@ -2491,6 +2491,8 @@ static void srpt_add_one(struct ib_device *device)
if (IS_ERR(sdev->pd))
goto free_dev;
sdev->lkey = sdev->pd->local_dma_lkey;
sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
srq_attr.event_handler = srpt_srq_event;

3
drivers/infiniband/ulp/srpt/ib_srpt.h
View File

@ -343,7 +343,7 @@ struct srpt_port {
* struct srpt_device - Information associated by SRPT with a single HCA.
* @device: Backpointer to the struct ib_device managed by the IB core.
* @pd: IB protection domain.
* @mr: L_Key (local key) with write access to all local memory.
* @lkey: L_Key (local key) with write access to all local memory.
* @srq: Per-HCA SRQ (shared receive queue).
* @cm_id: Connection identifier.
* @srq_size: SRQ size.
@ -358,6 +358,7 @@ struct srpt_port {
struct srpt_device {
struct ib_device *device;
struct ib_pd *pd;
u32 lkey;
struct ib_srq *srq;
struct ib_cm_id *cm_id;
int srq_size;