From 54b7bb76267bb040c38f89b7fe7d4b6cd520d389 Mon Sep 17 00:00:00 2001 From: Alexander Motin Date: Mon, 16 Mar 2015 09:15:59 +0000 Subject: [PATCH] Increase S/G list size of 32 to 33 entries. 32 entries are not enough for the worst case of misaligned 128KB request, that made FreeBSD to chunk large quests in odd pieces. MFC after: 2 weeks --- usr.sbin/bhyve/block_if.h | 2 +- usr.sbin/bhyve/pci_virtio_block.c | 12 +++++------- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/usr.sbin/bhyve/block_if.h b/usr.sbin/bhyve/block_if.h index 4e2c1b4e55e6..1cb7c8048688 100644 --- a/usr.sbin/bhyve/block_if.h +++ b/usr.sbin/bhyve/block_if.h @@ -39,7 +39,7 @@ #include #include -#define BLOCKIF_IOV_MAX 32 /* not practical to be IOV_MAX */ +#define BLOCKIF_IOV_MAX 33 /* not practical to be IOV_MAX */ struct blockif_req { struct iovec br_iov[BLOCKIF_IOV_MAX]; diff --git a/usr.sbin/bhyve/pci_virtio_block.c b/usr.sbin/bhyve/pci_virtio_block.c index b0d3830217a8..163fa0640e6a 100644 --- a/usr.sbin/bhyve/pci_virtio_block.c +++ b/usr.sbin/bhyve/pci_virtio_block.c @@ -55,8 +55,6 @@ __FBSDID("$FreeBSD$"); #define VTBLK_RINGSZ 64 -#define VTBLK_MAXSEGS 32 - #define VTBLK_S_OK 0 #define VTBLK_S_IOERR 1 #define VTBLK_S_UNSUPP 2 @@ -201,10 +199,10 @@ pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) int iolen; int writeop, type; off_t offset; - struct iovec iov[VTBLK_MAXSEGS + 2]; - uint16_t idx, flags[VTBLK_MAXSEGS + 2]; + struct iovec iov[BLOCKIF_IOV_MAX + 2]; + uint16_t idx, flags[BLOCKIF_IOV_MAX + 2]; - n = vq_getchain(vq, &idx, iov, VTBLK_MAXSEGS + 2, flags); + n = vq_getchain(vq, &idx, iov, BLOCKIF_IOV_MAX + 2, flags); /* * The first descriptor will be the read-only fixed header, @@ -214,7 +212,7 @@ pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) * XXX - note - this fails on crash dump, which does a * VIRTIO_BLK_T_FLUSH with a zero transfer length */ - assert(n >= 2 && n <= VTBLK_MAXSEGS + 2); + assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2); io = &sc->vbsc_ios[idx]; assert((flags[0] & VRING_DESC_F_WRITE) == 0); @@ -347,7 +345,7 @@ pci_vtblk_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts) /* setup virtio block config space */ sc->vbsc_cfg.vbc_capacity = size / DEV_BSIZE; /* 512-byte units */ sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */ - sc->vbsc_cfg.vbc_seg_max = VTBLK_MAXSEGS; + sc->vbsc_cfg.vbc_seg_max = BLOCKIF_IOV_MAX; sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */ sc->vbsc_cfg.vbc_geometry.heads = 0; sc->vbsc_cfg.vbc_geometry.sectors = 0;