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Make smartpqi(4) behave better when running out of memory, by returning

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CAM_RESRC_UNAVAIL instead of CAM_REQUEUE_REQ.  This makes CAM delay a bit
before retrying, so that the retries actually get a chance to succeed.

Reviewed by:	sbruno
MFC after:	2 weeks
Sponsored by:	Klara Inc.
Differential Revision:	https://reviews.freebsd.org/D19696
This commit is contained in:
Edward Tomasz Napierala 2019-03-26 15:47:13 +00:00
parent fd5795b23a
commit 7000d321e8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345549
1 changed files with 15 additions and 9 deletions
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24
sys/dev/smartpqi/smartpqi_cam.c
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@ -458,6 +458,15 @@ void os_aio_response_error(rcb_t *rcb, aio_path_error_info_elem_t *err_info)
DBG_IO("OUT\n");
}
static void
pqi_freeze_ccb(union ccb *ccb)
{
if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
ccb->ccb_h.status |= CAM_DEV_QFRZN;
xpt_freeze_devq(ccb->ccb_h.path, 1);
}
}
/*
* Command-mapping helper function - populate this command's s/g table.
*/
@ -472,9 +481,8 @@ pqi_request_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
if( error || nseg > softs->pqi_cap.max_sg_elem )
{
xpt_freeze_simq(softs->os_specific.sim, 1);
rcb->cm_ccb->ccb_h.status |= (CAM_REQUEUE_REQ|
CAM_RELEASE_SIMQ);
rcb->cm_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
pqi_freeze_ccb(rcb->cm_ccb);
DBG_ERR_BTL(rcb->dvp, "map failed err = %d or nseg(%d) > sgelem(%d)\n",
error, nseg, softs->pqi_cap.max_sg_elem);
pqi_unmap_request(rcb);
@ -484,9 +492,8 @@ pqi_request_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
rcb->sgt = os_mem_alloc(softs, nseg * sizeof(rcb_t));
if (rcb->sgt == NULL) {
xpt_freeze_simq(softs->os_specific.sim, 1);
rcb->cm_ccb->ccb_h.status |= (CAM_REQUEUE_REQ|
CAM_RELEASE_SIMQ);
rcb->cm_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
pqi_freeze_ccb(rcb->cm_ccb);
DBG_ERR_BTL(rcb->dvp, "os_mem_alloc() failed; nseg = %d\n", nseg);
pqi_unmap_request(rcb);
xpt_done((union ccb *)rcb->cm_ccb);
@ -514,9 +521,8 @@ pqi_request_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
if (error) {
rcb->req_pending = false;
xpt_freeze_simq(softs->os_specific.sim, 1);
rcb->cm_ccb->ccb_h.status |= (CAM_REQUEUE_REQ
|CAM_RELEASE_SIMQ);
rcb->cm_ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
pqi_freeze_ccb(rcb->cm_ccb);
DBG_ERR_BTL(rcb->dvp, "Build IO failed, error = %d\n", error);
pqi_unmap_request(rcb);
xpt_done((union ccb *)rcb->cm_ccb);