[PATCH v3 25/31] elx: efct: Hardware IO submission routines

James Smart
2020-04-12T03:33:57Z

This patch continues the efct driver population.

This patch adds driver definitions for:
Routines that write IO to Work queue, send SRRs and raw frames.

Signed-off-by: Ram Vegesna <ram.vegesna@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>

---
v3:
Reduced arguments for sli_fcp_tsend64_wqe(), sli_fcp_trsp64_wqe(),
sli_fcp_treceive64_wqe() calls
---
drivers/scsi/elx/efct/efct_hw.c | 519 ++++++++++++++++++++++++++++++++++++++++
drivers/scsi/elx/efct/efct_hw.h | 19 ++
2 files changed, 538 insertions(+)

diff --git a/drivers/scsi/elx/efct/efct_hw.c b/drivers/scsi/elx/efct/efct_hw.c
index fd3c2dec3ef6..26dd9bd1eeef 100644
--- a/drivers/scsi/elx/efct/efct_hw.c
+++ b/drivers/scsi/elx/efct/efct_hw.c
@@ -2516,3 +2516,522 @@ efct_hw_flush(struct efct_hw *hw)

return EFC_SUCCESS;
}
+
+int
+efct_hw_wq_write(struct hw_wq *wq, struct efct_hw_wqe *wqe)
+{
+ int rc = 0;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&wq->queue->lock, flags);
+ if (!list_empty(&wq->pending_list)) {
+ INIT_LIST_HEAD(&wqe->list_entry);
+ list_add_tail(&wqe->list_entry, &wq->pending_list);
+ wq->wq_pending_count++;
+ while ((wq->free_count > 0) &&
+ ((wqe = list_first_entry(&wq->pending_list,
+ struct efct_hw_wqe, list_entry))
+ != NULL)) {
+ list_del(&wqe->list_entry);
+ rc = _efct_hw_wq_write(wq, wqe);
+ if (rc < 0)
+ break;
+ if (wqe->abort_wqe_submit_needed) {
+ wqe->abort_wqe_submit_needed = false;
+ sli_abort_wqe(&wq->hw->sli,
+ wqe->wqebuf,
+ wq->hw->sli.wqe_size,
+ SLI_ABORT_XRI,
+ wqe->send_abts, wqe->id,
+ 0, wqe->abort_reqtag,
+ SLI4_CQ_DEFAULT);
+
+ INIT_LIST_HEAD(&wqe->list_entry);
+ list_add_tail(&wqe->list_entry,
+ &wq->pending_list);
+ wq->wq_pending_count++;
+ }
+ }
+ } else {
+ if (wq->free_count > 0) {
+ rc = _efct_hw_wq_write(wq, wqe);
+ } else {
+ INIT_LIST_HEAD(&wqe->list_entry);
+ list_add_tail(&wqe->list_entry, &wq->pending_list);
+ wq->wq_pending_count++;
+ }
+ }
+
+ spin_unlock_irqrestore(&wq->queue->lock, flags);
+
+ return rc;
+}
+
+/**
+ * This routine supports communication sequences consisting of a single
+ * request and single response between two endpoints. Examples include:
+ * - Sending an ELS request.
+ * - Sending an ELS response - To send an ELS response, the caller must provide
+ * the OX_ID from the received request.
+ * - Sending a FC Common Transport (FC-CT) request - To send a FC-CT request,
+ * the caller must provide the R_CTL, TYPE, and DF_CTL
+ * values to place in the FC frame header.
+ */
+enum efct_hw_rtn
+efct_hw_srrs_send(struct efct_hw *hw, enum efct_hw_io_type type,
+ struct efct_hw_io *io,
+ struct efc_dma *send, u32 len,
+ struct efc_dma *receive, struct efc_remote_node *rnode,
+ union efct_hw_io_param_u *iparam,
+ efct_hw_srrs_cb_t cb, void *arg)
+{
+ struct sli4_sge *sge = NULL;
+ enum efct_hw_rtn rc = EFCT_HW_RTN_SUCCESS;
+ u16 local_flags = 0;
+ u32 sge0_flags;
+ u32 sge1_flags;
+
+ if (!io || !rnode || !iparam) {
+ pr_err("bad parm hw=%p io=%p s=%p r=%p rn=%p iparm=%p\n",
+ hw, io, send, receive, rnode, iparam);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ if (hw->state != EFCT_HW_STATE_ACTIVE) {
+ efc_log_test(hw->os,
+ "cannot send SRRS, HW state=%d\n", hw->state);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ io->rnode = rnode;
+ io->type = type;
+ io->done = cb;
+ io->arg = arg;
+
+ sge = io->sgl->virt;
+
+ /* clear both SGE */
+ memset(io->sgl->virt, 0, 2 * sizeof(struct sli4_sge));
+
+ sge0_flags = le32_to_cpu(sge[0].dw2_flags);
+ sge1_flags = le32_to_cpu(sge[1].dw2_flags);
+ if (send) {
+ sge[0].buffer_address_high =
+ cpu_to_le32(upper_32_bits(send->phys));
+ sge[0].buffer_address_low =
+ cpu_to_le32(lower_32_bits(send->phys));
+
+ sge0_flags |= (SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT);
+
+ sge[0].buffer_length = cpu_to_le32(len);
+ }
+
+ if (type == EFCT_HW_ELS_REQ || type == EFCT_HW_FC_CT) {
+ sge[1].buffer_address_high =
+ cpu_to_le32(upper_32_bits(receive->phys));
+ sge[1].buffer_address_low =
+ cpu_to_le32(lower_32_bits(receive->phys));
+
+ sge1_flags |= (SLI4_SGE_TYPE_DATA << SLI4_SGE_TYPE_SHIFT);
+ sge1_flags |= SLI4_SGE_LAST;
+
+ sge[1].buffer_length = cpu_to_le32(receive->size);
+ } else {
+ sge0_flags |= SLI4_SGE_LAST;
+ }
+
+ sge[0].dw2_flags = cpu_to_le32(sge0_flags);
+ sge[1].dw2_flags = cpu_to_le32(sge1_flags);
+
+ switch (type) {
+ case EFCT_HW_ELS_REQ:
+ if (!send ||
+ sli_els_request64_wqe(&hw->sli, io->wqe.wqebuf,
+ hw->sli.wqe_size, io->sgl,
+ *((u8 *)send->virt),
+ len, receive->size,
+ iparam->els.timeout,
+ io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT, rnode->indicator,
+ rnode->sport->indicator,
+ rnode->attached, rnode->fc_id,
+ rnode->sport->fc_id)) {
+ efc_log_err(hw->os, "REQ WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ case EFCT_HW_ELS_RSP:
+ if (!send ||
+ sli_xmit_els_rsp64_wqe(&hw->sli, io->wqe.wqebuf,
+ hw->sli.wqe_size, send, len,
+ io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT, iparam->els.ox_id,
+ rnode->indicator,
+ rnode->sport->indicator,
+ rnode->attached, rnode->fc_id,
+ local_flags, U32_MAX)) {
+ efc_log_err(hw->os, "RSP WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ case EFCT_HW_ELS_RSP_SID:
+ if (!send ||
+ sli_xmit_els_rsp64_wqe(&hw->sli, io->wqe.wqebuf,
+ hw->sli.wqe_size, send, len,
+ io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT,
+ iparam->els.ox_id,
+ rnode->indicator,
+ rnode->sport->indicator,
+ rnode->attached, rnode->fc_id,
+ local_flags, iparam->els.s_id)) {
+ efc_log_err(hw->os, "RSP (SID) WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ case EFCT_HW_FC_CT:
+ if (!send ||
+ sli_gen_request64_wqe(&hw->sli, io->wqe.wqebuf, io->sgl,
+ len, receive->size, io->indicator,
+ io->reqtag, SLI4_CQ_DEFAULT,
+ rnode->fc_id, rnode->indicator,
+ &iparam->fc_ct)) {
+ efc_log_err(hw->os, "GEN WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ case EFCT_HW_FC_CT_RSP:
+ if (!send ||
+ sli_xmit_sequence64_wqe(&hw->sli, io->wqe.wqebuf,
+ io->sgl, len, io->indicator,
+ io->reqtag, rnode->fc_id,
+ rnode->indicator, &iparam->fc_ct)) {
+ efc_log_err(hw->os, "XMIT SEQ WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ case EFCT_HW_BLS_ACC:
+ case EFCT_HW_BLS_RJT:
+ {
+ struct sli_bls_payload bls;
+
+ if (type == EFCT_HW_BLS_ACC) {
+ bls.type = SLI4_SLI_BLS_ACC;
+ memcpy(&bls.u.acc, iparam->bls.payload,
+ sizeof(bls.u.acc));
+ } else {
+ bls.type = SLI4_SLI_BLS_RJT;
+ memcpy(&bls.u.rjt, iparam->bls.payload,
+ sizeof(bls.u.rjt));
+ }
+
+ bls.ox_id = cpu_to_le16(iparam->bls.ox_id);
+ bls.rx_id = cpu_to_le16(iparam->bls.rx_id);
+
+ if (sli_xmit_bls_rsp64_wqe(&hw->sli, io->wqe.wqebuf,
+ hw->sli.wqe_size, &bls,
+ io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT,
+ rnode->attached,
+ rnode->indicator,
+ rnode->sport->indicator,
+ rnode->fc_id, rnode->sport->fc_id,
+ U32_MAX)) {
+ efc_log_err(hw->os, "XMIT_BLS_RSP64 WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ }
+ case EFCT_HW_BLS_ACC_SID:
+ {
+ struct sli_bls_payload bls;
+
+ bls.type = SLI4_SLI_BLS_ACC;
+ memcpy(&bls.u.acc, iparam->bls.payload,
+ sizeof(bls.u.acc));
+
+ bls.ox_id = cpu_to_le16(iparam->bls.ox_id);
+ bls.rx_id = cpu_to_le16(iparam->bls.rx_id);
+
+ if (sli_xmit_bls_rsp64_wqe(&hw->sli, io->wqe.wqebuf,
+ hw->sli.wqe_size, &bls,
+ io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT,
+ rnode->attached,
+ rnode->indicator,
+ rnode->sport->indicator,
+ rnode->fc_id, rnode->sport->fc_id,
+ iparam->bls.s_id)) {
+ efc_log_err(hw->os, "XMIT_BLS_RSP64 WQE SID error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ }
+ default:
+ efc_log_err(hw->os, "bad SRRS type %#x\n", type);
+ rc = EFCT_HW_RTN_ERROR;
+ }
+
+ if (rc == EFCT_HW_RTN_SUCCESS) {
+
+ io->xbusy = true;
+
+ /*
+ * Add IO to active io wqe list before submitting, in case the
+ * wcqe processing preempts this thread.
+ */
+ io->wq->use_count++;
+ rc = efct_hw_wq_write(io->wq, &io->wqe);
+ if (rc >= 0) {
+ /* non-negative return is success */
+ rc = 0;
+ } else {
+ /* failed to write wqe, remove from active wqe list */
+ efc_log_err(hw->os,
+ "sli_queue_write failed: %d\n", rc);
+ io->xbusy = false;
+ }
+ }
+
+ return rc;
+}
+
+/**
+ * Send a read, write, or response IO.
+ *
+ * This routine supports sending a higher-level IO (for example, FCP) between
+ * two endpoints as a target or initiator. Examples include:
+ * - Sending read data and good response (target).
+ * - Sending a response (target with no data or after receiving write data).
+ * .
+ * This routine assumes all IOs use the SGL associated with the HW IO. Prior to
+ * calling this routine, the data should be loaded using efct_hw_io_add_sge().
+ */
+enum efct_hw_rtn
+efct_hw_io_send(struct efct_hw *hw, enum efct_hw_io_type type,
+ struct efct_hw_io *io,
+ u32 len, union efct_hw_io_param_u *iparam,
+ struct efc_remote_node *rnode, void *cb, void *arg)
+{
+ enum efct_hw_rtn rc = EFCT_HW_RTN_SUCCESS;
+ u32 rpi;
+ bool send_wqe = true;
+
+ if (!io || !rnode || !iparam) {
+ pr_err("bad parm hw=%p io=%p iparam=%p rnode=%p\n",
+ hw, io, iparam, rnode);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ if (hw->state != EFCT_HW_STATE_ACTIVE) {
+ efc_log_err(hw->os, "cannot send IO, HW state=%d\n",
+ hw->state);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ rpi = rnode->indicator;
+
+ /*
+ * Save state needed during later stages
+ */
+ io->rnode = rnode;
+ io->type = type;
+ io->done = cb;
+ io->arg = arg;
+
+ /*
+ * Format the work queue entry used to send the IO
+ */
+ switch (type) {
+ case EFCT_HW_IO_TARGET_WRITE: {
+ u16 flags = iparam->fcp_tgt.flags;
+ struct fcp_txrdy *xfer = io->xfer_rdy.virt;
+
+ /*
+ * Fill in the XFER_RDY for IF_TYPE 0 devices
+ */
+ xfer->ft_data_ro = cpu_to_be32(iparam->fcp_tgt.offset);
+ xfer->ft_burst_len = cpu_to_be32(len);
+
+ if (io->xbusy)
+ flags |= SLI4_IO_CONTINUATION;
+ else
+ flags &= ~SLI4_IO_CONTINUATION;
+
+ io->tgt_wqe_timeout = iparam->fcp_tgt.timeout;
+
+ if (sli_fcp_treceive64_wqe(&hw->sli, io->wqe.wqebuf,
+ &io->def_sgl, io->first_data_sge,
+ len, io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT, rpi, rnode->fc_id,
+ 0, 0, &iparam->fcp_tgt)) {
+ efc_log_err(hw->os, "TRECEIVE WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ }
+ case EFCT_HW_IO_TARGET_READ: {
+ u16 flags = iparam->fcp_tgt.flags;
+
+ if (io->xbusy)
+ flags |= SLI4_IO_CONTINUATION;
+ else
+ flags &= ~SLI4_IO_CONTINUATION;
+
+ io->tgt_wqe_timeout = iparam->fcp_tgt.timeout;
+
+ if (sli_fcp_tsend64_wqe(&hw->sli, io->wqe.wqebuf,
+ &io->def_sgl, io->first_data_sge,
+ len, io->indicator, io->reqtag,
+ SLI4_CQ_DEFAULT, rpi, rnode->fc_id,
+ 0, 0, &iparam->fcp_tgt)) {
+ efc_log_err(hw->os, "TSEND WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+ break;
+ }
+ case EFCT_HW_IO_TARGET_RSP: {
+ u16 flags = iparam->fcp_tgt.flags;
+
+ if (io->xbusy)
+ flags |= SLI4_IO_CONTINUATION;
+ else
+ flags &= ~SLI4_IO_CONTINUATION;
+
+ io->tgt_wqe_timeout = iparam->fcp_tgt.timeout;
+
+ if (sli_fcp_trsp64_wqe(&hw->sli, io->wqe.wqebuf,
+ &io->def_sgl, len, io->indicator,
+ io->reqtag, SLI4_CQ_DEFAULT, rpi,
+ rnode->fc_id, 0, &iparam->fcp_tgt)) {
+ efc_log_err(hw->os, "TRSP WQE error\n");
+ rc = EFCT_HW_RTN_ERROR;
+ }
+
+ break;
+ }
+ default:
+ efc_log_err(hw->os, "unsupported IO type %#x\n", type);
+ rc = EFCT_HW_RTN_ERROR;
+ }
+
+ if (send_wqe && rc == EFCT_HW_RTN_SUCCESS) {
+
+ io->xbusy = true;
+
+ /*
+ * Add IO to active io wqe list before submitting, in case the
+ * wcqe processing preempts this thread.
+ */
+ hw->tcmd_wq_submit[io->wq->instance]++;
+ io->wq->use_count++;
+ rc = efct_hw_wq_write(io->wq, &io->wqe);
+ if (rc >= 0) {
+ /* non-negative return is success */
+ rc = 0;
+ } else {
+ /* failed to write wqe, remove from active wqe list */
+ efc_log_err(hw->os,
+ "sli_queue_write failed: %d\n", rc);
+ io->xbusy = false;
+ }
+ }
+
+ return rc;
+}
+
+/**
+ * Send a raw frame
+ *
+ * Using the SEND_FRAME_WQE, a frame consisting of header and payload is sent.
+ */
+enum efct_hw_rtn
+efct_hw_send_frame(struct efct_hw *hw, struct fc_frame_header *hdr,
+ u8 sof, u8 eof, struct efc_dma *payload,
+ struct efct_hw_send_frame_context *ctx,
+ void (*callback)(void *arg, u8 *cqe, int status),
+ void *arg)
+{
+ int rc;
+ struct efct_hw_wqe *wqe;
+ u32 xri;
+ struct hw_wq *wq;
+
+ wqe = &ctx->wqe;
+
+ /* populate the callback object */
+ ctx->hw = hw;
+
+ /* Fetch and populate request tag */
+ ctx->wqcb = efct_hw_reqtag_alloc(hw, callback, arg);
+ if (!ctx->wqcb) {
+ efc_log_err(hw->os, "can't allocate request tag\n");
+ return EFCT_HW_RTN_NO_RESOURCES;
+ }
+
+ wq = hw->hw_wq[0];
+
+ /* Set XRI and RX_ID in the header based on which WQ, and which
+ * send_frame_io we are using
+ */
+ xri = wq->send_frame_io->indicator;
+
+ /* Build the send frame WQE */
+ rc = sli_send_frame_wqe(&hw->sli, wqe->wqebuf,
+ hw->sli.wqe_size, sof, eof,
+ (u32 *)hdr, payload, payload->len,
+ EFCT_HW_SEND_FRAME_TIMEOUT, xri,
+ ctx->wqcb->instance_index);
+ if (rc) {
+ efc_log_err(hw->os, "sli_send_frame_wqe failed: %d\n",
+ rc);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ /* Write to WQ */
+ rc = efct_hw_wq_write(wq, wqe);
+ if (rc) {
+ efc_log_err(hw->os, "efct_hw_wq_write failed: %d\n", rc);
+ return EFCT_HW_RTN_ERROR;
+ }
+
+ wq->use_count++;
+
+ return EFCT_HW_RTN_SUCCESS;
+}
+
+u32
+efct_hw_io_get_count(struct efct_hw *hw,
+ enum efct_hw_io_count_type io_count_type)
+{
+ struct efct_hw_io *io = NULL;
+ u32 count = 0;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&hw->io_lock, flags);
+
+ switch (io_count_type) {
+ case EFCT_HW_IO_INUSE_COUNT:
+ list_for_each_entry(io, &hw->io_inuse, list_entry) {
+ count = count + 1;
+ }
+ break;
+ case EFCT_HW_IO_FREE_COUNT:
+ list_for_each_entry(io, &hw->io_free, list_entry) {
+ count = count + 1;
+ }
+ break;
+ case EFCT_HW_IO_WAIT_FREE_COUNT:
+ list_for_each_entry(io, &hw->io_wait_free, list_entry) {
+ count = count + 1;
+ }
+ break;
+ case EFCT_HW_IO_N_TOTAL_IO_COUNT:
+ count = hw->config.n_io;
+ break;
+ }
+
+ spin_unlock_irqrestore(&hw->io_lock, flags);
+
+ return count;
+}
diff --git a/drivers/scsi/elx/efct/efct_hw.h b/drivers/scsi/elx/efct/efct_hw.h
index b427a4eda5a3..36a832f32616 100644
--- a/drivers/scsi/elx/efct/efct_hw.h
+++ b/drivers/scsi/elx/efct/efct_hw.h
@@ -714,4 +714,23 @@ efct_hw_process(struct efct_hw *hw, u32 vector, u32 max_isr_time_msec);
extern int
efct_hw_queue_hash_find(struct efct_queue_hash *hash, u16 id);

+int efct_hw_wq_write(struct hw_wq *wq, struct efct_hw_wqe *wqe);
+enum efct_hw_rtn
+efct_hw_send_frame(struct efct_hw *hw, struct fc_frame_header *hdr,
+ u8 sof, u8 eof, struct efc_dma *payload,
+ struct efct_hw_send_frame_context *ctx,
+ void (*callback)(void *arg, u8 *cqe, int status),
+ void *arg);
+typedef int(*efct_hw_srrs_cb_t)(struct efct_hw_io *io,
+ struct efc_remote_node *rnode, u32 length,
+ int status, u32 ext_status, void *arg);
+extern enum efct_hw_rtn
+efct_hw_srrs_send(struct efct_hw *hw, enum efct_hw_io_type type,
+ struct efct_hw_io *io,
+ struct efc_dma *send, u32 len,
+ struct efc_dma *receive, struct efc_remote_node *rnode,
+ union efct_hw_io_param_u *iparam,
+ efct_hw_srrs_cb_t cb,
+ void *arg);
+
#endif /* __EFCT_H__ */
--
2.16.4