From owner-dev-commits-src-main@freebsd.org Tue Jan 19 05:08:12 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 56D854E4DDE; Tue, 19 Jan 2021 05:08:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DKc9h4GdNz4XDX; Tue, 19 Jan 2021 05:08:08 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 9D02D20B3A; Tue, 19 Jan 2021 05:08:07 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 10J587WL085684; Tue, 19 Jan 2021 05:08:07 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 10J587n1085683; Tue, 19 Jan 2021 05:08:07 GMT (envelope-from git) Date: Tue, 19 Jan 2021 05:08:07 GMT Message-Id: <202101190508.10J587n1085683@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Bryan Venteicher Subject: git: d7f979bed092 - main - virtio_blk: Add modern (V1) support MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: bryanv X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: d7f979bed0924da1dbe4f79cb3b67554aead6e7f Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jan 2021 05:08:12 -0000 The branch main has been updated by bryanv: URL: https://cgit.FreeBSD.org/src/commit/?id=d7f979bed0924da1dbe4f79cb3b67554aead6e7f commit d7f979bed0924da1dbe4f79cb3b67554aead6e7f Author: Bryan Venteicher AuthorDate: 2021-01-19 04:55:24 +0000 Commit: Bryan Venteicher CommitDate: 2021-01-19 04:55:24 +0000 virtio_blk: Add modern (V1) support Rework the header file changes from 2cc8a52 to use our canonical upstream, Linux. geom_disk already checks DISKFLAG_CANDELETE for BIO_DELETE so remove an unnecessary check. Reviewed by: grehan (mentor) Differential Revision: https://reviews.freebsd.org/D27902 --- sys/dev/virtio/block/virtio_blk.c | 121 +++++++++++++++++++++++--------------- sys/dev/virtio/block/virtio_blk.h | 69 ++++++++++++++++------ 2 files changed, 125 insertions(+), 65 deletions(-) diff --git a/sys/dev/virtio/block/virtio_blk.c b/sys/dev/virtio/block/virtio_blk.c index 22005f52f4bc..091eb029530e 100644 --- a/sys/dev/virtio/block/virtio_blk.c +++ b/sys/dev/virtio/block/virtio_blk.c @@ -80,8 +80,7 @@ struct vtblk_softc { #define VTBLK_FLAG_DETACH 0x0004 #define VTBLK_FLAG_SUSPEND 0x0008 #define VTBLK_FLAG_BARRIER 0x0010 -#define VTBLK_FLAG_WC_CONFIG 0x0020 -#define VTBLK_FLAG_DISCARD 0x0040 +#define VTBLK_FLAG_WCE_CONFIG 0x0020 struct virtqueue *vtblk_vq; struct sglist *vtblk_sglist; @@ -110,10 +109,13 @@ static struct virtio_feature_desc vtblk_feature_desc[] = { { VIRTIO_BLK_F_RO, "ReadOnly" }, { VIRTIO_BLK_F_BLK_SIZE, "BlockSize" }, { VIRTIO_BLK_F_SCSI, "SCSICmds" }, - { VIRTIO_BLK_F_WCE, "WriteCache" }, + { VIRTIO_BLK_F_FLUSH, "FlushCmd" }, { VIRTIO_BLK_F_TOPOLOGY, "Topology" }, { VIRTIO_BLK_F_CONFIG_WCE, "ConfigWCE" }, + { VIRTIO_BLK_F_MQ, "Multiqueue" }, { VIRTIO_BLK_F_DISCARD, "Discard" }, + { VIRTIO_BLK_F_WRITE_ZEROES, "WriteZeros" }, + { 0, NULL } }; @@ -194,26 +196,35 @@ static int vtblk_write_cache_sysctl(SYSCTL_HANDLER_ARGS); static void vtblk_setup_sysctl(struct vtblk_softc *); static int vtblk_tunable_int(struct vtblk_softc *, const char *, int); +#define vtblk_modern(_sc) (((_sc)->vtblk_features & VIRTIO_F_VERSION_1) != 0) +#define vtblk_htog16(_sc, _val) virtio_htog16(vtblk_modern(_sc), _val) +#define vtblk_htog32(_sc, _val) virtio_htog32(vtblk_modern(_sc), _val) +#define vtblk_htog64(_sc, _val) virtio_htog64(vtblk_modern(_sc), _val) +#define vtblk_gtoh16(_sc, _val) virtio_gtoh16(vtblk_modern(_sc), _val) +#define vtblk_gtoh32(_sc, _val) virtio_gtoh32(vtblk_modern(_sc), _val) +#define vtblk_gtoh64(_sc, _val) virtio_gtoh64(vtblk_modern(_sc), _val) + /* Tunables. */ static int vtblk_no_ident = 0; TUNABLE_INT("hw.vtblk.no_ident", &vtblk_no_ident); static int vtblk_writecache_mode = -1; TUNABLE_INT("hw.vtblk.writecache_mode", &vtblk_writecache_mode); -/* Features desired/implemented by this driver. */ -#define VTBLK_FEATURES \ - (VIRTIO_BLK_F_BARRIER | \ - VIRTIO_BLK_F_SIZE_MAX | \ +#define VTBLK_COMMON_FEATURES \ + (VIRTIO_BLK_F_SIZE_MAX | \ VIRTIO_BLK_F_SEG_MAX | \ VIRTIO_BLK_F_GEOMETRY | \ VIRTIO_BLK_F_RO | \ VIRTIO_BLK_F_BLK_SIZE | \ - VIRTIO_BLK_F_WCE | \ + VIRTIO_BLK_F_FLUSH | \ VIRTIO_BLK_F_TOPOLOGY | \ VIRTIO_BLK_F_CONFIG_WCE | \ VIRTIO_BLK_F_DISCARD | \ VIRTIO_RING_F_INDIRECT_DESC) +#define VTBLK_MODERN_FEATURES (VTBLK_COMMON_FEATURES) +#define VTBLK_LEGACY_FEATURES (VIRTIO_BLK_F_BARRIER | VTBLK_COMMON_FEATURES) + #define VTBLK_MTX(_sc) &(_sc)->vtblk_mtx #define VTBLK_LOCK_INIT(_sc, _name) \ mtx_init(VTBLK_MTX((_sc)), (_name), \ @@ -227,6 +238,7 @@ TUNABLE_INT("hw.vtblk.writecache_mode", &vtblk_writecache_mode); #define VTBLK_DISK_NAME "vtbd" #define VTBLK_QUIESCE_TIMEOUT (30 * hz) +#define VTBLK_BSIZE 512 /* * Each block request uses at least two segments - one for the header @@ -566,13 +578,6 @@ vtblk_strategy(struct bio *bp) return; } - if ((bp->bio_cmd == BIO_DELETE) && - !(sc->vtblk_flags & VTBLK_FLAG_DISCARD)) { - VTBLK_UNLOCK(sc); - vtblk_bio_done(sc, bp, EOPNOTSUPP); - return; - } - bioq_insert_tail(&sc->vtblk_bioq, bp); vtblk_startio(sc); @@ -586,9 +591,11 @@ vtblk_negotiate_features(struct vtblk_softc *sc) uint64_t features; dev = sc->vtblk_dev; - features = VTBLK_FEATURES; + features = virtio_bus_is_modern(dev) ? VTBLK_MODERN_FEATURES : + VTBLK_LEGACY_FEATURES; sc->vtblk_features = virtio_negotiate_features(dev, features); + virtio_finalize_features(dev); } static void @@ -604,12 +611,12 @@ vtblk_setup_features(struct vtblk_softc *sc) sc->vtblk_flags |= VTBLK_FLAG_INDIRECT; if (virtio_with_feature(dev, VIRTIO_BLK_F_RO)) sc->vtblk_flags |= VTBLK_FLAG_READONLY; + if (virtio_with_feature(dev, VIRTIO_BLK_F_CONFIG_WCE)) + sc->vtblk_flags |= VTBLK_FLAG_WCE_CONFIG; + + /* Legacy. */ if (virtio_with_feature(dev, VIRTIO_BLK_F_BARRIER)) sc->vtblk_flags |= VTBLK_FLAG_BARRIER; - if (virtio_with_feature(dev, VIRTIO_BLK_F_CONFIG_WCE)) - sc->vtblk_flags |= VTBLK_FLAG_WC_CONFIG; - if (virtio_with_feature(dev, VIRTIO_BLK_F_DISCARD)) - sc->vtblk_flags |= VTBLK_FLAG_DISCARD; } static int @@ -688,13 +695,15 @@ vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg) dp->d_name = VTBLK_DISK_NAME; dp->d_unit = device_get_unit(dev); dp->d_drv1 = sc; - dp->d_flags = DISKFLAG_CANFLUSHCACHE | DISKFLAG_UNMAPPED_BIO | - DISKFLAG_DIRECT_COMPLETION; + dp->d_flags = DISKFLAG_UNMAPPED_BIO | DISKFLAG_DIRECT_COMPLETION; dp->d_hba_vendor = virtio_get_vendor(dev); dp->d_hba_device = virtio_get_device(dev); dp->d_hba_subvendor = virtio_get_subvendor(dev); dp->d_hba_subdevice = virtio_get_subdevice(dev); + if (virtio_with_feature(dev, VIRTIO_BLK_F_FLUSH)) + dp->d_flags |= DISKFLAG_CANFLUSHCACHE; + if ((sc->vtblk_flags & VTBLK_FLAG_READONLY) == 0) dp->d_dump = vtblk_dump; @@ -885,30 +894,31 @@ vtblk_request_bio(struct vtblk_softc *sc) bp = bioq_takefirst(bioq); req->vbr_bp = bp; req->vbr_ack = -1; - req->vbr_hdr.ioprio = 1; + req->vbr_hdr.ioprio = vtblk_gtoh32(sc, 1); switch (bp->bio_cmd) { case BIO_FLUSH: - req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_FLUSH); + req->vbr_hdr.sector = 0; break; case BIO_READ: - req->vbr_hdr.type = VIRTIO_BLK_T_IN; - req->vbr_hdr.sector = bp->bio_offset / VTBLK_BSIZE; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_IN); + req->vbr_hdr.sector = vtblk_gtoh64(sc, bp->bio_offset / VTBLK_BSIZE); break; case BIO_WRITE: - req->vbr_hdr.type = VIRTIO_BLK_T_OUT; - req->vbr_hdr.sector = bp->bio_offset / VTBLK_BSIZE; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_OUT); + req->vbr_hdr.sector = vtblk_gtoh64(sc, bp->bio_offset / VTBLK_BSIZE); break; case BIO_DELETE: - req->vbr_hdr.type = VIRTIO_BLK_T_DISCARD; - req->vbr_hdr.sector = bp->bio_offset / VTBLK_BSIZE; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_DISCARD); + req->vbr_hdr.sector = vtblk_gtoh64(sc, bp->bio_offset / VTBLK_BSIZE); break; default: panic("%s: bio with unhandled cmd: %d", __func__, bp->bio_cmd); } if (bp->bio_flags & BIO_ORDERED) - req->vbr_hdr.type |= VIRTIO_BLK_T_BARRIER; + req->vbr_hdr.type |= vtblk_gtoh32(sc, VIRTIO_BLK_T_BARRIER); return (req); } @@ -939,7 +949,8 @@ vtblk_request_execute(struct vtblk_softc *sc, struct vtblk_request *req) if (!virtqueue_empty(vq)) return (EBUSY); ordered = 1; - req->vbr_hdr.type &= ~VIRTIO_BLK_T_BARRIER; + req->vbr_hdr.type &= vtblk_gtoh32(sc, + ~VIRTIO_BLK_T_BARRIER); } } @@ -962,9 +973,10 @@ vtblk_request_execute(struct vtblk_softc *sc, struct vtblk_request *req) discard = malloc(sizeof(*discard), M_DEVBUF, M_NOWAIT | M_ZERO); if (discard == NULL) return (ENOMEM); - discard->sector = bp->bio_offset / VTBLK_BSIZE; - discard->num_sectors = bp->bio_bcount / VTBLK_BSIZE; + bp->bio_driver1 = discard; + discard->sector = vtblk_gtoh64(sc, bp->bio_offset / VTBLK_BSIZE); + discard->num_sectors = vtblk_gtoh32(sc, bp->bio_bcount / VTBLK_BSIZE); error = sglist_append(sg, discard, sizeof(*discard)); if (error || sg->sg_nseg == sg->sg_maxseg) { panic("%s: bio %p data buffer too big %d", @@ -1057,15 +1069,16 @@ vtblk_drain_vq(struct vtblk_softc *sc) static void vtblk_drain(struct vtblk_softc *sc) { - struct bio_queue queue; struct bio_queue_head *bioq; struct vtblk_request *req; struct bio *bp; bioq = &sc->vtblk_bioq; - TAILQ_INIT(&queue); if (sc->vtblk_vq != NULL) { + struct bio_queue queue; + + TAILQ_INIT(&queue); vtblk_queue_completed(sc, &queue); vtblk_done_completed(sc, &queue); @@ -1161,9 +1174,21 @@ vtblk_read_config(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg) /* Read the configuration if the feature was negotiated. */ VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_SIZE_MAX, size_max, blkcfg); VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_SEG_MAX, seg_max, blkcfg); - VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_GEOMETRY, geometry, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_GEOMETRY, + geometry.cylinders, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_GEOMETRY, + geometry.heads, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_GEOMETRY, + geometry.sectors, blkcfg); VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_BLK_SIZE, blk_size, blkcfg); - VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, topology, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, + topology.physical_block_exp, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, + topology.alignment_offset, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, + topology.min_io_size, blkcfg); + VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_TOPOLOGY, + topology.opt_io_size, blkcfg); VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_CONFIG_WCE, wce, blkcfg); VTBLK_GET_CONFIG(dev, VIRTIO_BLK_F_DISCARD, max_discard_sectors, blkcfg); @@ -1193,8 +1218,8 @@ vtblk_ident(struct vtblk_softc *sc) return; req->vbr_ack = -1; - req->vbr_hdr.type = VIRTIO_BLK_T_GET_ID; - req->vbr_hdr.ioprio = 1; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_GET_ID); + req->vbr_hdr.ioprio = vtblk_gtoh32(sc, 1); req->vbr_hdr.sector = 0; req->vbr_bp = &buf; @@ -1325,9 +1350,9 @@ vtblk_dump_write(struct vtblk_softc *sc, void *virtual, off_t offset, req = &sc->vtblk_dump_request; req->vbr_ack = -1; - req->vbr_hdr.type = VIRTIO_BLK_T_OUT; - req->vbr_hdr.ioprio = 1; - req->vbr_hdr.sector = offset / VTBLK_BSIZE; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_OUT); + req->vbr_hdr.ioprio = vtblk_gtoh32(sc, 1); + req->vbr_hdr.sector = vtblk_gtoh64(sc, offset / VTBLK_BSIZE); req->vbr_bp = &buf; g_reset_bio(&buf); @@ -1347,8 +1372,8 @@ vtblk_dump_flush(struct vtblk_softc *sc) req = &sc->vtblk_dump_request; req->vbr_ack = -1; - req->vbr_hdr.type = VIRTIO_BLK_T_FLUSH; - req->vbr_hdr.ioprio = 1; + req->vbr_hdr.type = vtblk_gtoh32(sc, VIRTIO_BLK_T_FLUSH); + req->vbr_hdr.ioprio = vtblk_gtoh32(sc, 1); req->vbr_hdr.sector = 0; req->vbr_bp = &buf; @@ -1385,7 +1410,7 @@ vtblk_write_cache_enabled(struct vtblk_softc *sc, { int wc; - if (sc->vtblk_flags & VTBLK_FLAG_WC_CONFIG) { + if (sc->vtblk_flags & VTBLK_FLAG_WCE_CONFIG) { wc = vtblk_tunable_int(sc, "writecache_mode", vtblk_writecache_mode); if (wc >= 0 && wc < VTBLK_CACHE_MAX) @@ -1393,7 +1418,7 @@ vtblk_write_cache_enabled(struct vtblk_softc *sc, else wc = blkcfg->wce; } else - wc = virtio_with_feature(sc->vtblk_dev, VIRTIO_BLK_F_WCE); + wc = virtio_with_feature(sc->vtblk_dev, VIRTIO_BLK_F_FLUSH); return (wc); } @@ -1410,7 +1435,7 @@ vtblk_write_cache_sysctl(SYSCTL_HANDLER_ARGS) error = sysctl_handle_int(oidp, &wc, 0, req); if (error || req->newptr == NULL) return (error); - if ((sc->vtblk_flags & VTBLK_FLAG_WC_CONFIG) == 0) + if ((sc->vtblk_flags & VTBLK_FLAG_WCE_CONFIG) == 0) return (EPERM); if (wc < 0 || wc >= VTBLK_CACHE_MAX) return (EINVAL); diff --git a/sys/dev/virtio/block/virtio_blk.h b/sys/dev/virtio/block/virtio_blk.h index 519886bad892..4c4a5caf51e8 100644 --- a/sys/dev/virtio/block/virtio_blk.h +++ b/sys/dev/virtio/block/virtio_blk.h @@ -33,26 +33,27 @@ #ifndef _VIRTIO_BLK_H #define _VIRTIO_BLK_H -#define VTBLK_BSIZE 512 - /* Feature bits */ - -#define VIRTIO_BLK_F_BARRIER 0x0001 /* Does host support barriers? */ #define VIRTIO_BLK_F_SIZE_MAX 0x0002 /* Indicates maximum segment size */ #define VIRTIO_BLK_F_SEG_MAX 0x0004 /* Indicates maximum # of segments */ #define VIRTIO_BLK_F_GEOMETRY 0x0010 /* Legacy geometry available */ #define VIRTIO_BLK_F_RO 0x0020 /* Disk is read-only */ #define VIRTIO_BLK_F_BLK_SIZE 0x0040 /* Block size of disk is available*/ -#define VIRTIO_BLK_F_SCSI 0x0080 /* Supports scsi command passthru */ #define VIRTIO_BLK_F_FLUSH 0x0200 /* Flush command supported */ -#define VIRTIO_BLK_F_WCE 0x0200 /* Legacy alias for FLUSH */ #define VIRTIO_BLK_F_TOPOLOGY 0x0400 /* Topology information is available */ #define VIRTIO_BLK_F_CONFIG_WCE 0x0800 /* Writeback mode available in config */ #define VIRTIO_BLK_F_MQ 0x1000 /* Support more than one vq */ -#define VIRTIO_BLK_F_DISCARD 0x2000 /* Trim blocks */ -#define VIRTIO_BLK_F_WRITE_ZEROES 0x4000 /* Write zeros */ +#define VIRTIO_BLK_F_DISCARD 0x2000 /* DISCARD is supported */ +#define VIRTIO_BLK_F_WRITE_ZEROES 0x4000 /* WRITE ZEROES is supported */ + +/* Legacy feature bits */ +#define VIRTIO_BLK_F_BARRIER 0x0001 /* Does host support barriers? */ +#define VIRTIO_BLK_F_SCSI 0x0080 /* Supports scsi command passthru */ + +/* Old (deprecated) name for VIRTIO_BLK_F_FLUSH. */ +#define VIRTIO_BLK_F_WCE VIRTIO_BLK_F_FLUSH -#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ +#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ struct virtio_blk_config { /* The capacity (in 512-byte sectors). */ @@ -87,14 +88,43 @@ struct virtio_blk_config { /* Writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */ uint8_t wce; uint8_t unused; + /* Number of vqs, only available when VIRTIO_BLK_F_MQ is set */ uint16_t num_queues; + + /* + * The next 3 entries are guarded by VIRTIO_BLK_F_DISCARD. + * + * The maximum discard sectors (in 512-byte sectors) for + * one segment. + */ uint32_t max_discard_sectors; + /* + * The maximum number of discard segments in a + * discard command. + */ uint32_t max_discard_seg; + /* Discard commands must be aligned to this number of sectors. */ uint32_t discard_sector_alignment; + + /* + * The next 3 entries are guarded by VIRTIO_BLK_F_WRITE_ZEROES + * + * The maximum number of write zeroes sectors (in 512-byte sectors) in + * one segment. + */ uint32_t max_write_zeroes_sectors; + /* + * The maximum number of segments in a write zeroes + * command. + */ uint32_t max_write_zeroes_seg; + /* + * Set if a VIRTIO_BLK_T_WRITE_ZEROES request may result in the + * deallocation of one or more of the sectors. + */ uint8_t write_zeroes_may_unmap; + uint8_t unused1[3]; } __packed; @@ -133,13 +163,14 @@ struct virtio_blk_config { /* Barrier before this op. */ #define VIRTIO_BLK_T_BARRIER 0x80000000 -/* ID string length */ -#define VIRTIO_BLK_ID_BYTES 20 - /* Unmap this range (only valid for write zeroes command) */ #define VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP 0x00000001 -/* This is the first element of the read scatter-gather list. */ +/* + * This comes first in the read scatter-gather list. + * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, + * this is the first element of the read scatter-gather list. + */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ uint32_t type; @@ -149,13 +180,17 @@ struct virtio_blk_outhdr { uint64_t sector; }; +/* Unmap this range (only valid for write zeroes command) */ +#define VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP 0x00000001 + +/* Discard/write zeroes range for each request. */ struct virtio_blk_discard_write_zeroes { + /* Discard/write zeroes start sector */ uint64_t sector; + /* Number of discard/write zeroes sectors */ uint32_t num_sectors; - struct { - uint32_t unmap:1; - uint32_t reserved:31; - } flags; + /* Flags for this range */ + uint32_t flags; }; struct virtio_scsi_inhdr {