--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+/* Copyright 2021 Marvell. All rights reserved. */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include <linux/qed/common_hsi.h>
+#include <linux/qed/storage_common.h>
+#include <linux/qed/nvmetcp_common.h>
+#include <linux/qed/qed_nvmetcp_if.h>
+#include "qed_nvmetcp_fw_funcs.h"
+
+#define NVMETCP_NUM_SGES_IN_CACHE 0x4
+
+bool nvmetcp_is_slow_sgl(u16 num_sges, bool small_mid_sge)
+{
+ return (num_sges > SCSI_NUM_SGES_SLOW_SGL_THR && small_mid_sge);
+}
+
+void init_scsi_sgl_context(struct scsi_sgl_params *ctx_sgl_params,
+ struct scsi_cached_sges *ctx_data_desc,
+ struct storage_sgl_task_params *sgl_params)
+{
+ u8 num_sges_to_init = (u8)(sgl_params->num_sges > NVMETCP_NUM_SGES_IN_CACHE ?
+ NVMETCP_NUM_SGES_IN_CACHE : sgl_params->num_sges);
+ u8 sge_index;
+
+ /* sgl params */
+ ctx_sgl_params->sgl_addr.lo = cpu_to_le32(sgl_params->sgl_phys_addr.lo);
+ ctx_sgl_params->sgl_addr.hi = cpu_to_le32(sgl_params->sgl_phys_addr.hi);
+ ctx_sgl_params->sgl_total_length = cpu_to_le32(sgl_params->total_buffer_size);
+ ctx_sgl_params->sgl_num_sges = cpu_to_le16(sgl_params->num_sges);
+
+ for (sge_index = 0; sge_index < num_sges_to_init; sge_index++) {
+ ctx_data_desc->sge[sge_index].sge_addr.lo =
+ cpu_to_le32(sgl_params->sgl[sge_index].sge_addr.lo);
+ ctx_data_desc->sge[sge_index].sge_addr.hi =
+ cpu_to_le32(sgl_params->sgl[sge_index].sge_addr.hi);
+ ctx_data_desc->sge[sge_index].sge_len =
+ cpu_to_le32(sgl_params->sgl[sge_index].sge_len);
+ }
+}
+
+static inline u32 calc_rw_task_size(struct nvmetcp_task_params *task_params,
+ enum nvmetcp_task_type task_type)
+{
+ u32 io_size;
+
+ if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE)
+ io_size = task_params->tx_io_size;
+ else
+ io_size = task_params->rx_io_size;
+
+ if (unlikely(!io_size))
+ return 0;
+
+ return io_size;
+}
+
+static inline void init_sqe(struct nvmetcp_task_params *task_params,
+ struct storage_sgl_task_params *sgl_task_params,
+ enum nvmetcp_task_type task_type)
+{
+ if (!task_params->sqe)
+ return;
+
+ memset(task_params->sqe, 0, sizeof(*task_params->sqe));
+ task_params->sqe->task_id = cpu_to_le16(task_params->itid);
+
+ switch (task_type) {
+ case NVMETCP_TASK_TYPE_HOST_WRITE: {
+ u32 buf_size = 0;
+ u32 num_sges = 0;
+
+ SET_FIELD(task_params->sqe->contlen_cdbsize,
+ NVMETCP_WQE_CDB_SIZE_OR_NVMETCP_CMD, 1);
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
+ NVMETCP_WQE_TYPE_NORMAL);
+ if (task_params->tx_io_size) {
+ if (task_params->send_write_incapsule)
+ buf_size = calc_rw_task_size(task_params, task_type);
+
+ if (nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
+ sgl_task_params->small_mid_sge))
+ num_sges = NVMETCP_WQE_NUM_SGES_SLOWIO;
+ else
+ num_sges = min((u16)sgl_task_params->num_sges,
+ (u16)SCSI_NUM_SGES_SLOW_SGL_THR);
+ }
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_NUM_SGES, num_sges);
+ SET_FIELD(task_params->sqe->contlen_cdbsize, NVMETCP_WQE_CONT_LEN, buf_size);
+ } break;
+
+ case NVMETCP_TASK_TYPE_HOST_READ: {
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
+ NVMETCP_WQE_TYPE_NORMAL);
+ SET_FIELD(task_params->sqe->contlen_cdbsize,
+ NVMETCP_WQE_CDB_SIZE_OR_NVMETCP_CMD, 1);
+ } break;
+
+ case NVMETCP_TASK_TYPE_INIT_CONN_REQUEST: {
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
+ NVMETCP_WQE_TYPE_MIDDLE_PATH);
+
+ if (task_params->tx_io_size) {
+ SET_FIELD(task_params->sqe->contlen_cdbsize, NVMETCP_WQE_CONT_LEN,
+ task_params->tx_io_size);
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_NUM_SGES,
+ min((u16)sgl_task_params->num_sges,
+ (u16)SCSI_NUM_SGES_SLOW_SGL_THR));
+ }
+ } break;
+
+ case NVMETCP_TASK_TYPE_CLEANUP:
+ SET_FIELD(task_params->sqe->flags, NVMETCP_WQE_WQE_TYPE,
+ NVMETCP_WQE_TYPE_TASK_CLEANUP);
+
+ default:
+ break;
+ }
+}
+
+/* The following function initializes of NVMeTCP task params */
+static inline void
+init_nvmetcp_task_params(struct e5_nvmetcp_task_context *context,
+ struct nvmetcp_task_params *task_params,
+ enum nvmetcp_task_type task_type)
+{
+ context->ystorm_st_context.state.cccid = task_params->host_cccid;
+ SET_FIELD(context->ustorm_st_context.error_flags, USTORM_NVMETCP_TASK_ST_CTX_NVME_TCP, 1);
+ context->ustorm_st_context.nvme_tcp_opaque_lo = cpu_to_le32(task_params->opq.lo);
+ context->ustorm_st_context.nvme_tcp_opaque_hi = cpu_to_le32(task_params->opq.hi);
+}
+
+/* The following function initializes default values to all tasks */
+static inline void
+init_default_nvmetcp_task(struct nvmetcp_task_params *task_params,
+ void *pdu_header, void *nvme_cmd,
+ enum nvmetcp_task_type task_type)
+{
+ struct e5_nvmetcp_task_context *context = task_params->context;
+ const u8 val_byte = context->mstorm_ag_context.cdu_validation;
+ u8 dw_index;
+
+ memset(context, 0, sizeof(*context));
+ init_nvmetcp_task_params(context, task_params,
+ (enum nvmetcp_task_type)task_type);
+
+ /* Swapping requirements used below, will be removed in future FW versions */
+ if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE ||
+ task_type == NVMETCP_TASK_TYPE_HOST_READ) {
+ for (dw_index = 0;
+ dw_index < QED_NVMETCP_CMN_HDR_SIZE / sizeof(u32);
+ dw_index++)
+ context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
+ cpu_to_le32(__swab32(((u32 *)pdu_header)[dw_index]));
+
+ for (dw_index = QED_NVMETCP_CMN_HDR_SIZE / sizeof(u32);
+ dw_index < QED_NVMETCP_CMD_HDR_SIZE / sizeof(u32);
+ dw_index++)
+ context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
+ cpu_to_le32(__swab32(((u32 *)nvme_cmd)[dw_index - 2]));
+ } else {
+ for (dw_index = 0;
+ dw_index < QED_NVMETCP_NON_IO_HDR_SIZE / sizeof(u32);
+ dw_index++)
+ context->ystorm_st_context.pdu_hdr.task_hdr.reg[dw_index] =
+ cpu_to_le32(__swab32(((u32 *)pdu_header)[dw_index]));
+ }
+
+ /* M-Storm Context: */
+ context->mstorm_ag_context.cdu_validation = val_byte;
+ context->mstorm_st_context.task_type = (u8)(task_type);
+ context->mstorm_ag_context.task_cid = cpu_to_le16(task_params->conn_icid);
+
+ /* Ustorm Context: */
+ SET_FIELD(context->ustorm_ag_context.flags1, E5_USTORM_NVMETCP_TASK_AG_CTX_R2T2RECV, 1);
+ context->ustorm_st_context.task_type = (u8)(task_type);
+ context->ustorm_st_context.cq_rss_number = task_params->cq_rss_number;
+ context->ustorm_ag_context.icid = cpu_to_le16(task_params->conn_icid);
+}
+
+/* The following function initializes the U-Storm Task Contexts */
+static inline void
+init_ustorm_task_contexts(struct ustorm_nvmetcp_task_st_ctx *ustorm_st_context,
+ struct e5_ustorm_nvmetcp_task_ag_ctx *ustorm_ag_context,
+ u32 remaining_recv_len,
+ u32 expected_data_transfer_len, u8 num_sges,
+ bool tx_dif_conn_err_en)
+{
+ /* Remaining data to be received in bytes. Used in validations*/
+ ustorm_st_context->rem_rcv_len = cpu_to_le32(remaining_recv_len);
+ ustorm_ag_context->exp_data_acked = cpu_to_le32(expected_data_transfer_len);
+ ustorm_st_context->exp_data_transfer_len = cpu_to_le32(expected_data_transfer_len);
+ SET_FIELD(ustorm_st_context->reg1_map, REG1_NUM_SGES, num_sges);
+ SET_FIELD(ustorm_ag_context->flags2, E5_USTORM_NVMETCP_TASK_AG_CTX_DIF_ERROR_CF_EN,
+ tx_dif_conn_err_en ? 1 : 0);
+}
+
+/* The following function initializes Local Completion Contexts: */
+static inline void
+set_local_completion_context(struct e5_nvmetcp_task_context *context)
+{
+ SET_FIELD(context->ystorm_st_context.state.flags,
+ YSTORM_NVMETCP_TASK_STATE_LOCAL_COMP, 1);
+ SET_FIELD(context->ustorm_st_context.flags,
+ USTORM_NVMETCP_TASK_ST_CTX_LOCAL_COMP, 1);
+}
+
+/* Common Fastpath task init function: */
+static inline void
+init_rw_nvmetcp_task(struct nvmetcp_task_params *task_params,
+ enum nvmetcp_task_type task_type,
+ void *pdu_header, void *nvme_cmd,
+ struct storage_sgl_task_params *sgl_task_params)
+{
+ struct e5_nvmetcp_task_context *context = task_params->context;
+ u32 task_size = calc_rw_task_size(task_params, task_type);
+ bool slow_io = false;
+ u8 num_sges = 0;
+
+ init_default_nvmetcp_task(task_params, pdu_header, nvme_cmd, task_type);
+
+ /* Tx/Rx: */
+ if (task_params->tx_io_size) {
+ /* if data to transmit: */
+ init_scsi_sgl_context(&context->ystorm_st_context.state.sgl_params,
+ &context->ystorm_st_context.state.data_desc,
+ sgl_task_params);
+ slow_io = nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
+ sgl_task_params->small_mid_sge);
+ num_sges =
+ (u8)(!slow_io ? min((u32)sgl_task_params->num_sges,
+ (u32)SCSI_NUM_SGES_SLOW_SGL_THR) :
+ NVMETCP_WQE_NUM_SGES_SLOWIO);
+ if (slow_io) {
+ SET_FIELD(context->ystorm_st_context.state.flags,
+ YSTORM_NVMETCP_TASK_STATE_SLOW_IO, 1);
+ }
+ } else if (task_params->rx_io_size) {
+ /* if data to receive: */
+ init_scsi_sgl_context(&context->mstorm_st_context.sgl_params,
+ &context->mstorm_st_context.data_desc,
+ sgl_task_params);
+ num_sges =
+ (u8)(!nvmetcp_is_slow_sgl(sgl_task_params->num_sges,
+ sgl_task_params->small_mid_sge) ?
+ min((u32)sgl_task_params->num_sges,
+ (u32)SCSI_NUM_SGES_SLOW_SGL_THR) :
+ NVMETCP_WQE_NUM_SGES_SLOWIO);
+ context->mstorm_st_context.rem_task_size = cpu_to_le32(task_size);
+ }
+
+ /* Ustorm context: */
+ init_ustorm_task_contexts(&context->ustorm_st_context,
+ &context->ustorm_ag_context,
+ /* Remaining Receive length is the Task Size */
+ task_size,
+ /* The size of the transmitted task */
+ task_size,
+ /* num_sges */
+ num_sges,
+ false);
+
+ /* Set exp_data_acked */
+ if (task_type == NVMETCP_TASK_TYPE_HOST_WRITE) {
+ if (task_params->send_write_incapsule)
+ context->ustorm_ag_context.exp_data_acked = task_size;
+ else
+ context->ustorm_ag_context.exp_data_acked = 0;
+ } else if (task_type == NVMETCP_TASK_TYPE_HOST_READ) {
+ context->ustorm_ag_context.exp_data_acked = 0;
+ }
+
+ context->ustorm_ag_context.exp_cont_len = 0;
+ init_sqe(task_params, sgl_task_params, task_type);
+}
+
+static void
+init_common_initiator_read_task(struct nvmetcp_task_params *task_params,
+ struct nvme_tcp_cmd_pdu *cmd_pdu_header,
+ struct nvme_command *nvme_cmd,
+ struct storage_sgl_task_params *sgl_task_params)
+{
+ init_rw_nvmetcp_task(task_params, NVMETCP_TASK_TYPE_HOST_READ,
+ cmd_pdu_header, nvme_cmd, sgl_task_params);
+}
+
+void init_nvmetcp_host_read_task(struct nvmetcp_task_params *task_params,
+ struct nvme_tcp_cmd_pdu *cmd_pdu_header,
+ struct nvme_command *nvme_cmd,
+ struct storage_sgl_task_params *sgl_task_params)
+{
+ init_common_initiator_read_task(task_params, (void *)cmd_pdu_header,
+ (void *)nvme_cmd, sgl_task_params);
+}
+
+static void
+init_common_initiator_write_task(struct nvmetcp_task_params *task_params,
+ struct nvme_tcp_cmd_pdu *cmd_pdu_header,
+ struct nvme_command *nvme_cmd,
+ struct storage_sgl_task_params *sgl_task_params)
+{
+ init_rw_nvmetcp_task(task_params, NVMETCP_TASK_TYPE_HOST_WRITE,
+ cmd_pdu_header, nvme_cmd, sgl_task_params);
+}
+
+void init_nvmetcp_host_write_task(struct nvmetcp_task_params *task_params,
+ struct nvme_tcp_cmd_pdu *cmd_pdu_header,
+ struct nvme_command *nvme_cmd,
+ struct storage_sgl_task_params *sgl_task_params)
+{
+ init_common_initiator_write_task(task_params, (void *)cmd_pdu_header,
+ (void *)nvme_cmd, sgl_task_params);
+}
+
+static void
+init_common_login_request_task(struct nvmetcp_task_params *task_params,
+ void *login_req_pdu_header,
+ struct storage_sgl_task_params *tx_sgl_task_params,
+ struct storage_sgl_task_params *rx_sgl_task_params)
+{
+ struct e5_nvmetcp_task_context *context = task_params->context;
+
+ init_default_nvmetcp_task(task_params, (void *)login_req_pdu_header, NULL,
+ NVMETCP_TASK_TYPE_INIT_CONN_REQUEST);
+
+ /* Ustorm Context: */
+ init_ustorm_task_contexts(&context->ustorm_st_context,
+ &context->ustorm_ag_context,
+
+ /* Remaining Receive length is the Task Size */
+ task_params->rx_io_size ?
+ rx_sgl_task_params->total_buffer_size : 0,
+
+ /* The size of the transmitted task */
+ task_params->tx_io_size ?
+ tx_sgl_task_params->total_buffer_size : 0,
+ 0, /* num_sges */
+ 0); /* tx_dif_conn_err_en */
+
+ /* SGL context: */
+ if (task_params->tx_io_size)
+ init_scsi_sgl_context(&context->ystorm_st_context.state.sgl_params,
+ &context->ystorm_st_context.state.data_desc,
+ tx_sgl_task_params);
+ if (task_params->rx_io_size)
+ init_scsi_sgl_context(&context->mstorm_st_context.sgl_params,
+ &context->mstorm_st_context.data_desc,
+ rx_sgl_task_params);
+
+ context->mstorm_st_context.rem_task_size =
+ cpu_to_le32(task_params->rx_io_size ?
+ rx_sgl_task_params->total_buffer_size : 0);
+ init_sqe(task_params, tx_sgl_task_params, NVMETCP_TASK_TYPE_INIT_CONN_REQUEST);
+}
+
+/* The following function initializes Login task in Host mode: */
+void init_nvmetcp_init_conn_req_task(struct nvmetcp_task_params *task_params,
+ struct nvme_tcp_icreq_pdu *init_conn_req_pdu_hdr,
+ struct storage_sgl_task_params *tx_sgl_task_params,
+ struct storage_sgl_task_params *rx_sgl_task_params)
+{
+ init_common_login_request_task(task_params, init_conn_req_pdu_hdr,
+ tx_sgl_task_params, rx_sgl_task_params);
+}
+
+void init_cleanup_task_nvmetcp(struct nvmetcp_task_params *task_params)
+{
+ init_sqe(task_params, NULL, NVMETCP_TASK_TYPE_CLEANUP);
+}
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