Hi Narsimhulu,
On 03/11/2015 06:01 PM, Narsimhulu Musini wrote:
> snic_io.h contains meta request structure definition
> meta request contains high level information about firmware requests.
> such as request information, size, SGLs.
>
> snic_io.c contains interfaces to handle meta request, firmware acknowledgment,
> and high level generic queueing interface.
>
> Signed-off-by: Narsimhulu Musini <nmusini@xxxxxxxxx>
> Signed-off-by: Sesidhar Baddela <sebaddel@xxxxxxxxx>
Please find some comments inline.
> ---
> drivers/scsi/snic/snic_io.c | 546 ++++++++++++++++++++++++++++++++++++++++++++
> drivers/scsi/snic/snic_io.h | 111 +++++++++
> 2 files changed, 657 insertions(+)
> create mode 100644 drivers/scsi/snic/snic_io.c
> create mode 100644 drivers/scsi/snic/snic_io.h
>
> diff --git a/drivers/scsi/snic/snic_io.c b/drivers/scsi/snic/snic_io.c
> new file mode 100644
> index 0000000..fe38c0b
> --- /dev/null
> +++ b/drivers/scsi/snic/snic_io.c
> @@ -0,0 +1,546 @@
> +/*
> + * Copyright 2014 Cisco Systems, Inc. All rights reserved.
> + *
> + * This program is free software; you may redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/pci.h>
> +#include <linux/slab.h>
> +
> +#include <linux/interrupt.h>
> +#include <linux/workqueue.h>
> +#include <linux/spinlock.h>
> +#include <linux/mempool.h>
> +#include <scsi/scsi_tcq.h>
> +
> +#include "snic_io.h"
> +#include "snic.h"
> +#include "cq_enet_desc.h"
> +#include "snic_fwint.h"
> +#include "snic_os.h"
> +
> +static void
> +snic_wq_cmpl_frame_send(struct vnic_wq *wq,
> + struct cq_desc *cq_desc,
> + struct vnic_wq_buf *buf,
> + void *opaque)
> +{
> + struct snic *snic = vnic_dev_priv(wq->vdev);
> +
> + SNIC_BUG_ON(buf->os_buf == NULL);
> +
> + if (snic_log_level & SNIC_DESC_LOGGING)
> + SNIC_HOST_INFO(snic->shost,
> + "Ack received for snic_host_req %p.\n",
> + buf->os_buf);
> +
> + SNIC_TRC(snic->shost->host_no, 0, 0,
> + ((u64)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0, 0);
> + pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
> + buf->os_buf = NULL;
> +}
> +
> +static int
> +snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
> + struct cq_desc *cq_desc,
> + u8 type,
> + u16 q_num,
> + u16 cmpl_idx,
> + void *opaque)
> +{
> + struct snic *snic = vnic_dev_priv(vdev);
> + unsigned long flags;
> +
> + SNIC_BUG_ON(q_num != 0);
> +
> + spin_lock_irqsave(&snic->wq_lock[q_num], flags);
> + vnic_wq_service(&snic->wq[q_num],
> + cq_desc,
> + cmpl_idx,
> + snic_wq_cmpl_frame_send,
> + NULL);
> + spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
> +
> + return 0;
> +} /* end of snic_cmpl_handler_cont */
> +
> +int
> +snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
> +{
> + unsigned int work_done = 0;
> + unsigned int i;
> +
> + snic->s_stats.misc.last_ack_time = jiffies;
> + for (i = 0; i < snic->wq_count; i++) {
> + work_done += vnic_cq_service(&snic->cq[i],
> + work_to_do,
> + snic_wq_cmpl_handler_cont,
> + NULL);
> + }
> +
> + return work_done;
> +} /* end of snic_wq_cmpl_handler */
> +
> +void
> +snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
> +{
> +
> + struct snic_host_req *req = buf->os_buf;
> + struct snic *snic = vnic_dev_priv(wq->vdev);
> + struct snic_req_info *rqi = NULL;
> + unsigned long flags;
> +
> + pci_unmap_single(snic->pdev, buf->dma_addr, buf->len, PCI_DMA_TODEVICE);
> +
> + rqi = req_to_rqi(req);
> + spin_lock_irqsave(&snic->spl_cmd_lock, flags);
> + if (list_empty(&rqi->list)) {
> + spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
> + goto end;
> + }
> +
> + SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
> + list_del_init(&rqi->list);
> + spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
> +
> + if (rqi->sge_va) {
> + snic_pci_unmap_rsp_buf(snic, rqi);
> + kfree((void *)rqi->sge_va);
> + rqi->sge_va = 0;
> + }
> + snic_req_free(snic, rqi);
> + SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");
> +
> +end:
> + return;
> +}
> +
> +/* Criteria to select work queue in multi queue mode */
> +static int
> +snic_select_wq(struct snic *snic)
> +{
> + /* No multi queue support for now */
> + BUILD_BUG_ON(SNIC_WQ_MAX > 1);
> +
> + return 0;
> +}
> +
> +int
> +snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
> +{
> + dma_addr_t pa = 0;
> + unsigned long flags;
> + struct snic_fw_stats *fwstats = &snic->s_stats.fw;
> + long act_reqs;
> + int q_num = 0;
> +
> + snic_print_desc(__func__, os_buf, len);
> +
> + /* Map request buffer */
> + pa = pci_map_single(snic->pdev, os_buf, len, PCI_DMA_TODEVICE);
> + if (pci_dma_mapping_error(snic->pdev, pa)) {
> + SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");
> +
> + return -ENOMEM;
> + }
> +
> + q_num = snic_select_wq(snic);
> +
> + spin_lock_irqsave(&snic->wq_lock[q_num], flags);
> + if (!vnic_wq_desc_avail(snic->wq)) {
> + pci_unmap_single(snic->pdev, pa, len, PCI_DMA_TODEVICE);
> + spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
> + atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
> + SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
> +
> + return -ENOMEM;
> + }
> +
> + snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
> + spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
> +
> + /* Update stats */
> + act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
> + if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
> + atomic64_set(&fwstats->max_actv_reqs, act_reqs);
> +
> + return 0;
> +} /* end of snic_queue_wq_desc() */
> +
> +/*
> + * snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
> + * Purpose : Used during driver unload to clean up the requests.
> + */
> +void
> +snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
> +{
> + unsigned long flags;
> +
> + INIT_LIST_HEAD(&rqi->list);
> +
> + spin_lock_irqsave(&snic->spl_cmd_lock, flags);
> + list_add_tail(&rqi->list, &snic->spl_cmd_list);
> + spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
> +}
> +
> +static struct snic_host_req *
> +snic_req_align(struct snic_host_req *req)
> +{
> + unsigned long sgl_ptr;
> +
> + sgl_ptr = (unsigned long) req;
> + /* Cache sgl list allocated address before alignment */
> + if (sgl_ptr % SNIC_SG_DESC_ALIGN) {
> + req = (struct snic_host_req *)
> + ((sgl_ptr + SNIC_SG_DESC_ALIGN - 1) &
> + ~(SNIC_SG_DESC_ALIGN - 1));
> +
> + }
> +
> + return req;
> +}
> +
> +/*
> + * snic_req_init:
> + * Allocates snic_req_info + snic_host_req + sgl data, and initializes.
> + */
> +struct snic_req_info *
> +snic_req_init(struct snic *snic, int sg_cnt)
> +{
> + u8 typ;
> + struct snic_req_info *rqi = NULL;
> +
> + typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
> + SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;
> +
> + rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
> + if (!rqi) {
> + atomic64_inc(&snic->s_stats.io.alloc_fail);
> + SNIC_HOST_ERR(snic->shost,
> + "Failed to allocate memory from snic req pool id = %d\n",
> + typ);
> + return rqi;
> + }
> +
> + memset(rqi, 0, sizeof(*rqi));
> + rqi->rq_pool_type = typ;
> + rqi->start_time = jiffies;
> + rqi->req = (struct snic_host_req *) (rqi + 1);
> + rqi->req_len = sizeof(struct snic_host_req);
> + rqi->snic = snic;
> +
> + BUILD_BUG_ON((sizeof(struct snic_req_info) % SNIC_SG_DESC_ALIGN) != 0);
> + BUILD_BUG_ON((sizeof(struct snic_host_req) % SNIC_SG_DESC_ALIGN) != 0);
> +
> + rqi->req = snic_req_align(rqi->req);
> +
Any reason why you can't allocate aligned requests directly from the
mempool?
> + if (sg_cnt == 0)
> + goto end;
> +
> + rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));
> +
> + if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
> + atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);
> +
> + SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
> + atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);
> +
> +end:
> + memset(rqi->req, 0, rqi->req_len);
> +
> + /* pre initialization of init_ctx to support req_to_rqi */
> + rqi->req->hdr.init_ctx = (u64) rqi;
> +
> + SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);
> +
> + return rqi;
> +} /* end of snic_req_init */
> +
> +/*
> + * snic_abort_req_init : Inits abort request.
> + */
> +struct snic_host_req *
> +snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
> +{
> + struct snic_host_req *req = NULL;
> +
> + SNIC_BUG_ON(!rqi);
> +
> + /* If abort to be issued second time, then reuse */
> + if (rqi->abort_req)
> + return rqi->abort_req;
> +
> +
> + req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
> + if (!req) {
> + SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
> + WARN_ON_ONCE(1);
> +
> + return NULL;
> + }
> +
> + rqi->abort_req_unaligned = req;
> + rqi->abort_req = snic_req_align(req);
Same here.
> + req = rqi->abort_req;
> + memset(req, 0, sizeof(struct snic_host_req));
> + /* pre initialization of init_ctx to support req_to_rqi */
> + req->hdr.init_ctx = (u64) rqi;
> +
> + return req;
> +} /* end of snic_abort_req_init */
> +
> +/*
> + * snic_dr_req_init : Inits device reset req
> + */
> +struct snic_host_req *
> +snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
> +{
> + struct snic_host_req *req = NULL;
> +
> + SNIC_BUG_ON(!rqi);
> +
> + req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
> + if (!req) {
> + SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
> + WARN_ON_ONCE(1);
> +
> + return NULL;
> + }
> +
> + SNIC_BUG_ON(rqi->dr_req_unaligned != NULL);
> + rqi->dr_req_unaligned = req;
> + rqi->dr_req = snic_req_align(req);
And here.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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