Date: Thu, 24 Apr 2014 15:16:27 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r264884 - head/sys/cam/ctl Message-ID: <201404241516.s3OFGR0o090169@svn.freebsd.org>
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Author: mav Date: Thu Apr 24 15:16:26 2014 New Revision: 264884 URL: http://svnweb.freebsd.org/changeset/base/264884 Log: Make CAM target CTL frontend respect SIM I/O size limitations. If datamove size is bigger then SIM can handle, or it has more segments then this code can handle -- split it into several CTIO requests. Modified: head/sys/cam/ctl/scsi_ctl.c Modified: head/sys/cam/ctl/scsi_ctl.c ============================================================================== --- head/sys/cam/ctl/scsi_ctl.c Thu Apr 24 14:58:12 2014 (r264883) +++ head/sys/cam/ctl/scsi_ctl.c Thu Apr 24 15:16:26 2014 (r264884) @@ -79,6 +79,7 @@ typedef enum { struct ctlfe_softc { struct ctl_frontend fe; path_id_t path_id; + u_int maxio; struct cam_sim *sim; char port_name[DEV_IDLEN]; struct mtx lun_softc_mtx; @@ -129,13 +130,15 @@ typedef enum { */ struct ctlfe_lun_cmd_info { int cur_transfer_index; + size_t cur_transfer_off; ctlfe_cmd_flags flags; /* * XXX KDM struct bus_dma_segment is 8 bytes on i386, and 16 * bytes on amd64. So with 32 elements, this is 256 bytes on * i386 and 512 bytes on amd64. */ - bus_dma_segment_t cam_sglist[32]; +#define CTLFE_MAX_SEGS 32 + bus_dma_segment_t cam_sglist[CTLFE_MAX_SEGS]; }; /* @@ -375,6 +378,10 @@ ctlfeasync(void *callback_arg, uint32_t bus_softc->path_id = cpi->ccb_h.path_id; bus_softc->sim = xpt_path_sim(path); + if (cpi->maxio != 0) + bus_softc->maxio = cpi->maxio; + else + bus_softc->maxio = DFLTPHYS; mtx_init(&bus_softc->lun_softc_mtx, "LUN softc mtx", NULL, MTX_DEF); STAILQ_INIT(&bus_softc->lun_softc_list); @@ -693,6 +700,90 @@ ctlfecleanup(struct cam_periph *periph) } static void +ctlfedata(struct ctlfe_lun_softc *softc, union ctl_io *io, + ccb_flags *flags, uint8_t **data_ptr, uint32_t *dxfer_len, + u_int16_t *sglist_cnt) +{ + struct ctlfe_softc *bus_softc; + struct ctlfe_lun_cmd_info *cmd_info; + struct ctl_sg_entry *ctl_sglist; + bus_dma_segment_t *cam_sglist; + size_t off; + int i, idx; + + cmd_info = (struct ctlfe_lun_cmd_info *)io->io_hdr.port_priv; + bus_softc = softc->parent_softc; + + /* + * Set the direction, relative to the initiator. + */ + *flags &= ~CAM_DIR_MASK; + if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == CTL_FLAG_DATA_IN) + *flags |= CAM_DIR_IN; + else + *flags |= CAM_DIR_OUT; + + *flags &= ~CAM_DATA_MASK; + idx = cmd_info->cur_transfer_index; + off = cmd_info->cur_transfer_off; + cmd_info->flags &= ~CTLFE_CMD_PIECEWISE; + if (io->scsiio.kern_sg_entries == 0) { + /* No S/G list. */ + *data_ptr = io->scsiio.kern_data_ptr + off; + if (io->scsiio.kern_data_len - off <= bus_softc->maxio) { + *dxfer_len = io->scsiio.kern_data_len - off; + } else { + *dxfer_len = bus_softc->maxio; + cmd_info->cur_transfer_index = -1; + cmd_info->cur_transfer_off = bus_softc->maxio; + cmd_info->flags |= CTLFE_CMD_PIECEWISE; + } + *sglist_cnt = 0; + + if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) + *flags |= CAM_DATA_PADDR; + else + *flags |= CAM_DATA_VADDR; + } else { + /* S/G list with physical or virtual pointers. */ + ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr; + cam_sglist = cmd_info->cam_sglist; + *dxfer_len = 0; + for (i = 0; i < io->scsiio.kern_sg_entries - idx; i++) { + cam_sglist[i].ds_addr = (bus_addr_t)ctl_sglist[i + idx].addr + off; + if (ctl_sglist[i + idx].len - off <= bus_softc->maxio - *dxfer_len) { + cam_sglist[i].ds_len = ctl_sglist[idx + i].len - off; + *dxfer_len += cam_sglist[i].ds_len; + } else { + cam_sglist[i].ds_len = bus_softc->maxio - *dxfer_len; + cmd_info->cur_transfer_index = idx + i; + cmd_info->cur_transfer_off = cam_sglist[i].ds_len + off; + cmd_info->flags |= CTLFE_CMD_PIECEWISE; + *dxfer_len += cam_sglist[i].ds_len; + if (ctl_sglist[i].len != 0) + i++; + break; + } + if (i == (CTLFE_MAX_SEGS - 1) && + idx + i < (io->scsiio.kern_sg_entries - 1)) { + cmd_info->cur_transfer_index = idx + i + 1; + cmd_info->cur_transfer_off = 0; + cmd_info->flags |= CTLFE_CMD_PIECEWISE; + i++; + break; + } + off = 0; + } + *sglist_cnt = i; + if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) + *flags |= CAM_DATA_SG_PADDR; + else + *flags |= CAM_DATA_SG; + *data_ptr = (uint8_t *)cam_sglist; + } +} + +static void ctlfestart(struct cam_periph *periph, union ccb *start_ccb) { struct ctlfe_lun_softc *softc; @@ -854,84 +945,10 @@ ctlfestart(struct cam_periph *periph, un bzero(cmd_info, sizeof(*cmd_info)); scsi_status = 0; - /* - * Set the direction, relative to the initiator. - */ - flags &= ~CAM_DIR_MASK; - if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == - CTL_FLAG_DATA_IN) - flags |= CAM_DIR_IN; - else - flags |= CAM_DIR_OUT; - csio->cdb_len = atio->cdb_len; - flags &= ~CAM_DATA_MASK; - if (io->scsiio.kern_sg_entries == 0) { - /* No S/G list */ - data_ptr = io->scsiio.kern_data_ptr; - dxfer_len = io->scsiio.kern_data_len; - csio->sglist_cnt = 0; - - if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) - flags |= CAM_DATA_PADDR; - else - flags |= CAM_DATA_VADDR; - } else if (io->scsiio.kern_sg_entries <= - (sizeof(cmd_info->cam_sglist)/ - sizeof(cmd_info->cam_sglist[0]))) { - /* - * S/G list with physical or virtual pointers. - * Just populate the CAM S/G list with the - * pointers. - */ - int i; - struct ctl_sg_entry *ctl_sglist; - bus_dma_segment_t *cam_sglist; - - ctl_sglist = (struct ctl_sg_entry *) - io->scsiio.kern_data_ptr; - cam_sglist = cmd_info->cam_sglist; - - for (i = 0; i < io->scsiio.kern_sg_entries;i++){ - cam_sglist[i].ds_addr = - (bus_addr_t)ctl_sglist[i].addr; - cam_sglist[i].ds_len = - ctl_sglist[i].len; - } - csio->sglist_cnt = io->scsiio.kern_sg_entries; - if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) - flags |= CAM_DATA_SG_PADDR; - else - flags |= CAM_DATA_SG; - data_ptr = (uint8_t *)cam_sglist; - dxfer_len = io->scsiio.kern_data_len; - } else { - /* S/G list with virtual pointers */ - struct ctl_sg_entry *sglist; - int *ti; - - /* - * If we have more S/G list pointers than - * will fit in the available storage in the - * cmd_info structure inside the ctl_io header, - * then we need to send down the pointers - * one element at a time. - */ - - sglist = (struct ctl_sg_entry *) - io->scsiio.kern_data_ptr; - ti = &cmd_info->cur_transfer_index; - data_ptr = sglist[*ti].addr; - dxfer_len = sglist[*ti].len; - csio->sglist_cnt = 0; - if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) - flags |= CAM_DATA_PADDR; - else - flags |= CAM_DATA_VADDR; - cmd_info->flags |= CTLFE_CMD_PIECEWISE; - (*ti)++; - } + ctlfedata(softc, io, &flags, &data_ptr, &dxfer_len, + &csio->sglist_cnt); io->scsiio.ext_data_filled += dxfer_len; @@ -1416,37 +1433,18 @@ ctlfedone(struct cam_periph *periph, uni * continue sending pieces if necessary. */ if ((cmd_info->flags & CTLFE_CMD_PIECEWISE) - && (io->io_hdr.port_status == 0) - && (cmd_info->cur_transfer_index < - io->scsiio.kern_sg_entries)) { - struct ctl_sg_entry *sglist; + && (io->io_hdr.port_status == 0)) { ccb_flags flags; uint8_t scsi_status; uint8_t *data_ptr; uint32_t dxfer_len; - int *ti; - sglist = (struct ctl_sg_entry *) - io->scsiio.kern_data_ptr; - ti = &cmd_info->cur_transfer_index; flags = atio->ccb_h.flags & (CAM_DIS_DISCONNECT| - CAM_TAG_ACTION_VALID| - CAM_DIR_MASK); - - /* - * Set the direction, relative to the initiator. - */ - flags &= ~CAM_DIR_MASK; - if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) == - CTL_FLAG_DATA_IN) - flags |= CAM_DIR_IN; - else - flags |= CAM_DIR_OUT; + CAM_TAG_ACTION_VALID); - data_ptr = sglist[*ti].addr; - dxfer_len = sglist[*ti].len; - (*ti)++; + ctlfedata(softc, io, &flags, &data_ptr, + &dxfer_len, &csio->sglist_cnt); scsi_status = 0;
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