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bhyve: implement NVMe Flush command

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This adds support for the NVMe I/O command Flush. For block-based
devices, submit a DIOCGFLUSH to the backing storage. Otherwise, command
is treated like a NOP and completes with a Successful status.

Tested by:	Jason Tubnor
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D24880
This commit is contained in:
Chuck Tuffli 2020-06-29 00:31:17 +00:00
parent a43ab8d253
commit 9963f1805c
1 changed files with 43 additions and 1 deletions
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44
usr.sbin/bhyve/pci_nvme.c
View File

@ -58,6 +58,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/errno.h>
#include <sys/types.h>
#include <net/ieee_oui.h>
@ -1387,6 +1388,46 @@ pci_nvme_io_partial(struct blockif_req *br, int err)
pthread_cond_signal(&req->cv);
}
/*
* Implements the Flush command. The specification states:
* If a volatile write cache is not present, Flush commands complete
* successfully and have no effect
* in the description of the Volatile Write Cache (VWC) field of the Identify
* Controller data. Therefore, set status to Success if the command is
* not supported (i.e. RAM or as indicated by the blockif).
*/
static bool
nvme_opc_flush(struct pci_nvme_softc *sc,
struct nvme_command *cmd,
struct pci_nvme_blockstore *nvstore,
struct pci_nvme_ioreq *req,
uint16_t *status)
{
bool pending = false;
if (nvstore->type == NVME_STOR_RAM) {
pci_nvme_status_genc(status, NVME_SC_SUCCESS);
} else {
int err;
req->io_req.br_callback = pci_nvme_io_done;
err = blockif_flush(nvstore->ctx, &req->io_req);
switch (err) {
case 0:
pending = true;
break;
case EOPNOTSUPP:
pci_nvme_status_genc(status, NVME_SC_SUCCESS);
break;
default:
pci_nvme_status_genc(status, NVME_SC_INTERNAL_DEVICE_ERROR);
}
}
return (pending);
}
static bool
nvme_opc_write_read(struct pci_nvme_softc *sc,
struct nvme_command *cmd,
@ -1682,7 +1723,8 @@ pci_nvme_handle_io_cmd(struct pci_nvme_softc* sc, uint16_t idx)
switch (cmd->opc) {
case NVME_OPC_FLUSH:
pci_nvme_status_genc(&status, NVME_SC_SUCCESS);
pending = nvme_opc_flush(sc, cmd, &sc->nvstore,
req, &status);
break;
case NVME_OPC_WRITE:
case NVME_OPC_READ: