Date: Sun, 15 Oct 2017 23:53:56 +0000 (UTC) From: Warner Losh <imp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r324644 - in head/sys: cam/nvme dev/nvme Message-ID: <201710152353.v9FNruu1088169@repo.freebsd.org>
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Author: imp Date: Sun Oct 15 23:53:55 2017 New Revision: 324644 URL: https://svnweb.freebsd.org/changeset/base/324644 Log: Closer examination shows that nvme and CAM both normally zero-fill allocations (for req and ccb, which ultimately contain the nvme_cmd). As such, we can micro-optimize these routines. Add a comment to this effect, and bzero the ccb used to make the requests for the nda dump rotuine so it more closely matches a ccb allocated with xpt_get_ccb(). Sponsored by: Netflix Modified: head/sys/cam/nvme/nvme_da.c head/sys/dev/nvme/nvme.h Modified: head/sys/cam/nvme/nvme_da.c ============================================================================== --- head/sys/cam/nvme/nvme_da.c Sun Oct 15 22:45:25 2017 (r324643) +++ head/sys/cam/nvme/nvme_da.c Sun Oct 15 23:53:55 2017 (r324644) @@ -398,6 +398,8 @@ ndadump(void *arg, void *virtual, vm_offset_t physical return (ENXIO); } + /* xpt_get_ccb returns a zero'd allocation for the ccb, mimic that here */ + memset(&nvmeio, 0, sizeof(nvmeio)); if (length > 0) { xpt_setup_ccb(&nvmeio.ccb_h, periph->path, CAM_PRIORITY_NORMAL); nvmeio.ccb_h.ccb_state = NDA_CCB_DUMP; Modified: head/sys/dev/nvme/nvme.h ============================================================================== --- head/sys/dev/nvme/nvme.h Sun Oct 15 22:45:25 2017 (r324643) +++ head/sys/dev/nvme/nvme.h Sun Oct 15 23:53:55 2017 (r324644) @@ -1068,7 +1068,12 @@ uint32_t nvme_ns_get_stripesize(struct nvme_namespace int nvme_ns_bio_process(struct nvme_namespace *ns, struct bio *bp, nvme_cb_fn_t cb_fn); -/* Command building helper functions -- shared with CAM */ +/* + * Command building helper functions -- shared with CAM + * These functions assume allocator zeros out cmd structure + * CAM's xpt_get_ccb and the request allocator for nvme both + * do zero'd allocations. + */ static inline void nvme_ns_flush_cmd(struct nvme_command *cmd, uint32_t nsid) { @@ -1082,17 +1087,10 @@ void nvme_ns_rw_cmd(struct nvme_command *cmd, uint32_t uint64_t lba, uint32_t count) { cmd->opc = rwcmd; - cmd->fuse = 0; - cmd->rsvd1 = 0; cmd->nsid = nsid; - cmd->rsvd2 = 0; - cmd->rsvd3 = 0; cmd->cdw10 = lba & 0xffffffffu; cmd->cdw11 = lba >> 32; cmd->cdw12 = count-1; - cmd->cdw13 = 0; - cmd->cdw14 = 0; - cmd->cdw15 = 0; } static inline
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