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Message-ID: <20161019100253.vxqxp5fhoxrlt6ay@linux-x5ow.site>
Date: Wed, 19 Oct 2016 12:02:53 +0200
From: Johannes Thumshirn <jthumshirn@...e.de>
To: manish.rangankar@...ium.com
Cc: lduncan@...e.com, cleech@...hat.com, martin.petersen@...cle.com,
jejb@...ux.vnet.ibm.com, linux-scsi@...r.kernel.org,
netdev@...r.kernel.org, Yuval.Mintz@...ium.com,
QLogic-Storage-Upstream@...ium.com,
Nilesh Javali <nilesh.javali@...ium.com>,
Adheer Chandravanshi <adheer.chandravanshi@...gic.com>,
Chad Dupuis <chad.dupuis@...ium.com>,
Saurav Kashyap <saurav.kashyap@...ium.com>,
Arun Easi <arun.easi@...ium.com>
Subject: Re: [RFC 3/6] qedi: Add QLogic FastLinQ offload iSCSI driver
framework.
On Wed, Oct 19, 2016 at 01:01:10AM -0400, manish.rangankar@...ium.com wrote:
> From: Manish Rangankar <manish.rangankar@...ium.com>
>
> The QLogic FastLinQ Driver for iSCSI (qedi) is the iSCSI specific module
> for 41000 Series Converged Network Adapters by QLogic.
>
> This patch consists of following changes:
> - MAINTAINERS Makefile and Kconfig changes for qedi,
> - PCI driver registration,
> - iSCSI host level initialization,
> - Debugfs and log level infrastructure.
>
> Signed-off-by: Nilesh Javali <nilesh.javali@...ium.com>
> Signed-off-by: Adheer Chandravanshi <adheer.chandravanshi@...gic.com>
> Signed-off-by: Chad Dupuis <chad.dupuis@...ium.com>
> Signed-off-by: Saurav Kashyap <saurav.kashyap@...ium.com>
> Signed-off-by: Arun Easi <arun.easi@...ium.com>
> Signed-off-by: Manish Rangankar <manish.rangankar@...ium.com>
> ---
[...]
> +static inline void *qedi_get_task_mem(struct qed_iscsi_tid *info, u32 tid)
> +{
> + return (void *)(info->blocks[tid / info->num_tids_per_block] +
> + (tid % info->num_tids_per_block) * info->size);
> +}
Unnecessary cast here.
[...]
> +void
> +qedi_dbg_err(struct qedi_dbg_ctx *qedi, const char *func, u32 line,
> + const char *fmt, ...)
> +{
> + va_list va;
> + struct va_format vaf;
> + char nfunc[32];
> +
> + memset(nfunc, 0, sizeof(nfunc));
> + memcpy(nfunc, func, sizeof(nfunc) - 1);
> +
> + va_start(va, fmt);
> +
> + vaf.fmt = fmt;
> + vaf.va = &va;
> +
> + if (likely(qedi) && likely(qedi->pdev))
> + pr_crit("[%s]:[%s:%d]:%d: %pV", dev_name(&qedi->pdev->dev),
> + nfunc, line, qedi->host_no, &vaf);
> + else
> + pr_crit("[0000:00:00.0]:[%s:%d]: %pV", nfunc, line, &vaf);
pr_crit, seriously?
[...]
> +static void qedi_int_fp(struct qedi_ctx *qedi)
> +{
> + struct qedi_fastpath *fp;
> + int id;
> +
> + memset((void *)qedi->fp_array, 0, MIN_NUM_CPUS_MSIX(qedi) *
> + sizeof(*qedi->fp_array));
> + memset((void *)qedi->sb_array, 0, MIN_NUM_CPUS_MSIX(qedi) *
> + sizeof(*qedi->sb_array));
I don't think the cast is necessary here.
[...]
> +static int qedi_setup_cid_que(struct qedi_ctx *qedi)
> +{
> + int i;
> +
> + qedi->cid_que.cid_que_base = kmalloc((qedi->max_active_conns *
> + sizeof(u32)), GFP_KERNEL);
> + if (!qedi->cid_que.cid_que_base)
> + return -ENOMEM;
> +
> + qedi->cid_que.conn_cid_tbl = kmalloc((qedi->max_active_conns *
> + sizeof(struct qedi_conn *)),
> + GFP_KERNEL);
Please use kmalloc_array() here.
[...]
> +/* MSI-X fastpath handler code */
> +static irqreturn_t qedi_msix_handler(int irq, void *dev_id)
> +{
> + struct qedi_fastpath *fp = dev_id;
> + struct qedi_ctx *qedi = fp->qedi;
> + bool wake_io_thread = true;
> +
> + qed_sb_ack(fp->sb_info, IGU_INT_DISABLE, 0);
> +
> +process_again:
> + wake_io_thread = qedi_process_completions(fp);
> + if (wake_io_thread) {
> + QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_DISC,
> + "process already running\n");
> + }
> +
> + if (qedi_fp_has_work(fp) == 0)
> + qed_sb_update_sb_idx(fp->sb_info);
> +
> + /* Check for more work */
> + rmb();
> +
> + if (qedi_fp_has_work(fp) == 0)
> + qed_sb_ack(fp->sb_info, IGU_INT_ENABLE, 1);
> + else
> + goto process_again;
> +
> + return IRQ_HANDLED;
> +}
You might want to consider workqueues here.
[...]
> +static int qedi_alloc_itt(struct qedi_ctx *qedi)
> +{
> + qedi->itt_map = kzalloc((sizeof(struct qedi_itt_map) *
> + MAX_ISCSI_TASK_ENTRIES), GFP_KERNEL);
that screams for kcalloc()
> + if (!qedi->itt_map) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Unable to allocate itt map array memory\n");
> + return -ENOMEM;
> + }
> + return 0;
> +}
> +
> +static void qedi_free_itt(struct qedi_ctx *qedi)
> +{
> + kfree(qedi->itt_map);
> +}
> +
> +static struct qed_ll2_cb_ops qedi_ll2_cb_ops = {
> + .rx_cb = qedi_ll2_rx,
> + .tx_cb = NULL,
> +};
> +
> +static int qedi_percpu_io_thread(void *arg)
> +{
> + struct qedi_percpu_s *p = arg;
> + struct qedi_work *work, *tmp;
> + unsigned long flags;
> + LIST_HEAD(work_list);
> +
> + set_user_nice(current, -20);
> +
> + while (!kthread_should_stop()) {
> + spin_lock_irqsave(&p->p_work_lock, flags);
> + while (!list_empty(&p->work_list)) {
> + list_splice_init(&p->work_list, &work_list);
> + spin_unlock_irqrestore(&p->p_work_lock, flags);
> +
> + list_for_each_entry_safe(work, tmp, &work_list, list) {
> + list_del_init(&work->list);
> + qedi_fp_process_cqes(work->qedi, &work->cqe,
> + work->que_idx);
> + kfree(work);
> + }
> + spin_lock_irqsave(&p->p_work_lock, flags);
> + }
> + set_current_state(TASK_INTERRUPTIBLE);
> + spin_unlock_irqrestore(&p->p_work_lock, flags);
> + schedule();
> + }
> + __set_current_state(TASK_RUNNING);
> +
> + return 0;
> +}
A kthread with prio -20 IRQs turned off looping over a list, what could
possibly go wrong here. I bet you your favorite beverage that this will
cause Soft Lockups when running I/O stress tests BTDT.
[...]
> + if (mode != QEDI_MODE_RECOVERY) {
> + if (iscsi_host_add(qedi->shost, &pdev->dev)) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Could not add iscsi host\n");
> + rc = -ENOMEM;
> + goto remove_host;
> + }
> +
> + /* Allocate uio buffers */
> + rc = qedi_alloc_uio_rings(qedi);
> + if (rc) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "UIO alloc ring failed err=%d\n", rc);
> + goto remove_host;
> + }
> +
> + rc = qedi_init_uio(qedi);
> + if (rc) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "UIO init failed, err=%d\n", rc);
> + goto free_uio;
> + }
> +
> + /* host the array on iscsi_conn */
> + rc = qedi_setup_cid_que(qedi);
> + if (rc) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Could not setup cid que\n");
> + goto free_uio;
> + }
> +
> + rc = qedi_cm_alloc_mem(qedi);
> + if (rc) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Could not alloc cm memory\n");
> + goto free_cid_que;
> + }
> +
> + rc = qedi_alloc_itt(qedi);
> + if (rc) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Could not alloc itt memory\n");
> + goto free_cid_que;
> + }
> +
> + sprintf(host_buf, "host_%d", qedi->shost->host_no);
> + qedi->tmf_thread = create_singlethread_workqueue(host_buf);
> + if (!qedi->tmf_thread) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Unable to start tmf thread!\n");
> + rc = -ENODEV;
> + goto free_cid_que;
> + }
> +
> + sprintf(host_buf, "qedi_ofld%d", qedi->shost->host_no);
> + qedi->offload_thread = create_workqueue(host_buf);
> + if (!qedi->offload_thread) {
> + QEDI_ERR(&qedi->dbg_ctx,
> + "Unable to start offload thread!\n");
> + rc = -ENODEV;
> + goto free_cid_que;
> + }
> +
> + /* F/w needs 1st task context memory entry for performance */
> + set_bit(QEDI_RESERVE_TASK_ID, qedi->task_idx_map);
> + atomic_set(&qedi->num_offloads, 0);
> + }
> +
> + QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO,
> + "QLogic FastLinQ iSCSI Module qedi %s, FW %d.%d.%d.%d\n",
> + QEDI_MODULE_VERSION, FW_MAJOR_VERSION, FW_MINOR_VERSION,
> + FW_REVISION_VERSION, FW_ENGINEERING_VERSION);
> + return 0;
Please put the QEDI_INFO() above the if and invert the condition.
Thanks,
Johannes
--
Johannes Thumshirn Storage
jthumshirn@...e.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
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