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Add CAM/NVMe support for CAM_DATA_SG

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This adds support in pass(4) for data to be described with a
scatter-gather list (sglist) to augment the existing (single) virtual
address.

Differential Revision: https://reviews.freebsd.org/D11361
Submitted by: Chuck Tuffli
Reviewed by: imp@, scottl@, kenm@
This commit is contained in:
Warner Losh 2017-08-29 15:29:57 +00:00
parent 850564b948
commit 519772814d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=322997
7 changed files with 31 additions and 14 deletions
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3
sys/cam/cam_ccb.h
View File

@ -831,7 +831,8 @@ struct ccb_nvmeio {
struct nvme_completion cpl; /* NVME completion, per NVME standard */
uint8_t *data_ptr; /* Ptr to the data buf/SG list */
uint32_t dxfer_len; /* Data transfer length */
uint32_t resid; /* Transfer residual length: 2's comp unused ?*/
uint16_t sglist_cnt; /* Number of SG list entries */
uint16_t unused; /* padding for removed uint32_t */
};
/*

7
sys/cam/nvme/nvme_da.c
View File

@ -1010,12 +1010,7 @@ ndadone(struct cam_periph *periph, union ccb *done_ccb)
bp->bio_resid = bp->bio_bcount;
bp->bio_flags |= BIO_ERROR;
} else {
if (state == NDA_CCB_TRIM)
bp->bio_resid = 0;
else
bp->bio_resid = nvmeio->resid;
if (bp->bio_resid > 0)
bp->bio_flags |= BIO_ERROR;
bp->bio_resid = 0;
}
if (state == NDA_CCB_TRIM)
free(bp->bio_driver2, M_NVMEDA);

8
sys/cam/scsi/scsi_pass.c
View File

@ -1396,15 +1396,11 @@ passmemsetup(struct cam_periph *periph, struct pass_io_req *io_req)
io_req->data_flags = ccb->ccb_h.flags & CAM_DATA_MASK;
/*
* We only support a single virtual address for NVMe
*/
if ((ccb->ccb_h.flags & CAM_DATA_MASK) != CAM_DATA_VADDR)
return (EINVAL);
data_ptrs[0] = &ccb->nvmeio.data_ptr;
lengths[0] = ccb->nvmeio.dxfer_len;
dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
num_segs = ccb->nvmeio.sglist_cnt;
seg_cnt_ptr = &ccb->nvmeio.sglist_cnt;
numbufs = 1;
maxmap = softc->maxio;
break;

15
sys/dev/nvme/nvme_private.h
View File

@ -135,6 +135,7 @@ struct nvme_completion_poll_status {
#ifdef NVME_UNMAPPED_BIO_SUPPORT
#define NVME_REQUEST_BIO 4
#endif
#define NVME_REQUEST_CCB 5
struct nvme_request {
@ -517,6 +518,20 @@ nvme_allocate_request_bio(struct bio *bio, nvme_cb_fn_t cb_fn, void *cb_arg)
return (req);
}
static __inline struct nvme_request *
nvme_allocate_request_ccb(union ccb *ccb, nvme_cb_fn_t cb_fn, void *cb_arg)
{
struct nvme_request *req;
req = _nvme_allocate_request(cb_fn, cb_arg);
if (req != NULL) {
req->type = NVME_REQUEST_CCB;
req->u.payload = ccb;
}
return (req);
}
#define nvme_free_request(req) uma_zfree(nvme_request_zone, req)
void nvme_notify_async_consumers(struct nvme_controller *ctrlr,

8
sys/dev/nvme/nvme_qpair.c
View File

@ -851,6 +851,14 @@ _nvme_qpair_submit_request(struct nvme_qpair *qpair, struct nvme_request *req)
"bus_dmamap_load_bio returned 0x%x!\n", err);
break;
#endif
case NVME_REQUEST_CCB:
err = bus_dmamap_load_ccb(tr->qpair->dma_tag_payload,
tr->payload_dma_map, req->u.payload,
nvme_payload_map, tr, 0);
if (err != 0)
nvme_printf(qpair->ctrlr,
"bus_dmamap_load_ccb returned 0x%x!\n", err);
break;
default:
panic("unknown nvme request type 0x%x\n", req->type);
break;

2
sys/dev/nvme/nvme_sim.c
View File

@ -96,6 +96,8 @@ nvme_sim_nvmeio(struct cam_sim *sim, union ccb *ccb)
if ((nvmeio->ccb_h.flags & CAM_DATA_MASK) == CAM_DATA_BIO)
req = nvme_allocate_request_bio((struct bio *)payload,
nvme_sim_nvmeio_done, ccb);
else if ((nvmeio->ccb_h.flags & CAM_DATA_SG) == CAM_DATA_SG)
req = nvme_allocate_request_ccb(ccb, nvme_sim_nvmeio_done, ccb);
else if (payload == NULL)
req = nvme_allocate_request_null(nvme_sim_nvmeio_done, ccb);
else

2
sys/kern/subr_bus_dma.c
View File

@ -225,7 +225,7 @@ _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
nvmeio = &ccb->nvmeio;
data_ptr = nvmeio->data_ptr;
dxfer_len = nvmeio->dxfer_len;
sglist_cnt = 0;
sglist_cnt = nvmeio->sglist_cnt;
break;
}
default: