// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Broadcom. All Rights Reserved. The term
* “Broadcom” refers to Broadcom Inc. and/or its subsidiaries.
*/
#include "efct_driver.h"
#include "efct_unsol.h"
#define frame_printf(efct, hdr, fmt, ...) \
do { \
char s_id_text[16]; \
efc_node_fcid_display(ntoh24((hdr)->fh_s_id), \
s_id_text, sizeof(s_id_text)); \
efc_log_debug(efct, "[%06x.%s] %02x/%04x/%04x: " fmt, \
ntoh24((hdr)->fh_d_id), s_id_text, \
(hdr)->fh_r_ctl, be16_to_cpu((hdr)->fh_ox_id), \
be16_to_cpu((hdr)->fh_rx_id), ##__VA_ARGS__); \
} while (0)
static struct efct_node *
efct_node_find(struct efct *efct, u32 port_id, u32 node_id)
{
struct efct_node *node;
u64 id = (u64)port_id << 32 | node_id;
/*
* During node shutdown, Lookup will be removed first,
* before announcing to backend. So, no new IOs will be allowed
*/
/* Find a target node, given s_id and d_id */
node = xa_load(&efct->lookup, id);
if (node)
kref_get(&node->ref);
return node;
}
static int
efct_dispatch_frame(struct efct *efct, struct efc_hw_sequence *seq)
{
struct efct_node *node;
struct fc_frame_header *hdr;
u32 s_id, d_id;
hdr = seq->header->dma.virt;
/* extract the s_id and d_id */
s_id = ntoh24(hdr->fh_s_id);
d_id = ntoh24(hdr->fh_d_id);
if (!(hdr->fh_type == FC_TYPE_FCP || hdr->fh_type == FC_TYPE_BLS))
return -EIO;
if (hdr->fh_type == FC_TYPE_FCP) {
node = efct_node_find(efct, d_id, s_id);
if (!node) {
efc_log_err(efct,
"Node not found, drop cmd d_id:%x s_id:%x\n",
d_id, s_id);
efct_hw_sequence_free(&efct->hw, seq);
return 0;
}
efct_dispatch_fcp_cmd(node, seq);
} else {
node = efct_node_find(efct, d_id, s_id);
if (!node) {
efc_log_err(efct, "ABTS: Node not found, d_id:%x s_id:%x\n",
d_id, s_id);
return -EIO;
}
efc_log_err(efct, "Received ABTS for Node:%p\n", node);
efct_node_recv_abts_frame(node, seq);
}
kref_put(&node->ref, node->release);
efct_hw_sequence_free(&efct->hw, seq);
return 0;
}
int
efct_unsolicited_cb(void *arg, struct efc_hw_sequence *seq)
{
struct efct *efct = arg;
/* Process FCP command */
if (!efct_dispatch_frame(efct, seq))
return 0;
/* Forward frame to discovery lib */
efc_dispatch_frame(efct->efcport, seq);
return 0;
}
static int
efct_fc_tmf_rejected_cb(struct efct_io *io,
enum efct_scsi_io_status scsi_status,
u32 flags, void *arg)
{
efct_scsi_io_free(io);
return 0;
}
static void
efct_dispatch_unsol_tmf(struct efct_io *io, u8 tm_flags, u32 lun)
{
u32 i;
struct {
u32 mask;
enum efct_scsi_tmf_cmd cmd;
} tmflist[] = {
{FCP_TMF_ABT_TASK_SET, EFCT_SCSI_TMF_ABORT_TASK_SET},
{FCP_TMF_CLR_TASK_SET, EFCT_SCSI_TMF_CLEAR_TASK_SET},
{FCP_TMF_LUN_RESET, EFCT_SCSI_TMF_LOGICAL_UNIT_RESET},
{FCP_TMF_TGT_RESET, EFCT_SCSI_TMF_TARGET_RESET},
{FCP_TMF_CLR_ACA, EFCT_SCSI_TMF_CLEAR_ACA} };
io->exp_xfer_len = 0;
for (i = 0; i < ARRAY_SIZE(tmflist); i++) {
if (tmflist[i].mask & tm_flags) {
io->tmf_cmd = tmflist[i].cmd;
efct_scsi_recv_tmf(io, lun, tmflist[i].cmd, NULL, 0);
break;
}
}
if (i == ARRAY_SIZE(tmflist)) {
/* Not handled */
efc_log_err(io->node->efct, "TMF x%x rejected\n", tm_flags);
efct_scsi_send_tmf_resp(io, EFCT_SCSI_TMF_FUNCTION_REJECTED,
NULL, efct_fc_tmf_rejected_cb, NULL);
}
}
static int
efct_validate_fcp_cmd(struct efct *efct, struct efc_hw_sequence *seq)
{
/*
* If we received less than FCP_CMND_IU bytes, assume that the frame is
* corrupted in some way and drop it.
* This was seen when jamming the FCTL
* fill bytes field.
*/
if (seq->payload->dma.len < sizeof(struct fcp_cmnd)) {
struct fc_frame_header *fchdr = seq->header->dma.virt;
efc_log_debug(efct,
"drop ox_id %04x payload (%zd) less than (%zd)\n",
be16_to_cpu(fchdr->fh_ox_id),
seq->payload->dma.len, sizeof(struct fcp_cmnd));
return -EIO;
}
return 0;
}
static void
efct_populate_io_fcp_cmd(struct efct_io *io, struct fcp_cmnd *cmnd,
struct fc_frame_header *fchdr, bool sit)
{
io->init_task_tag = be16_to_cpu(fchdr->fh_ox_id);
/* note, tgt_task_tag, hw_tag set when HW io is allocated */
io->exp_xfer_len = be32_to_cpu(cmnd->fc_dl);
io->transferred = 0;
/* The upper 7 bits of CS_CTL is the frame priority thru the SAN.
* Our assertion here is, the priority given to a frame containing
* the FCP cmd should be the priority given to ALL frames contained
* in that IO. Thus we need to save the incoming CS_CTL here.
*/
if (ntoh24(fchdr->fh_f_ctl) & FC_FC_RES_B17)
io->cs_ctl = fchdr->fh_cs_ctl;
else
io->cs_ctl = 0;
io->seq_init = sit;
}
static u32
efct_get_flags_fcp_cmd(struct fcp_cmnd *cmnd)
{
u32 flags = 0;
switch (cmnd->fc_pri_ta & FCP_PTA_MASK) {
case FCP_PTA_SIMPLE:
flags |= EFCT_SCSI_CMD_SIMPLE;
break;
case FCP_PTA_HEADQ:
flags |= EFCT_SCSI_CMD_HEAD_OF_QUEUE;
break;
case FCP_PTA_ORDERED:
flags |= EFCT_SCSI_CMD_ORDERED;
break;
case FCP_PTA_ACA:
flags |= EFCT_SCSI_CMD_ACA;
break;
}
if (cmnd->fc_flags & FCP_CFL_WRDATA)
flags |= EFCT_SCSI_CMD_DIR_IN;
if (cmnd->fc_flags & FCP_CFL_RDDATA)
flags |= EFCT_SCSI_CMD_DIR_OUT;
return flags;
}
static void
efct_sframe_common_send_cb(void *arg, u8 *cqe, int status)
{
struct efct_hw_send_frame_context *ctx = arg;
struct efct_hw *hw = ctx->hw;
/* Free WQ completion callback */
efct_hw_reqtag_free(hw, ctx->wqcb);
/* Free sequence */
efct_hw_sequence_free(hw, ctx->seq);
}
static int
efct_sframe_common_send(struct efct_node *node,
struct efc_hw_sequence *seq,
enum fc_rctl r_ctl, u32 f_ctl,
u8 type, void *payload, u32 payload_len)
{
struct efct *efct = node->efct;
struct efct_hw *hw = &efct->hw;
int rc = 0;
struct fc_frame_header *req_hdr = seq->header->dma.virt;
struct fc_frame_header hdr;
struct efct_hw_send_frame_context *ctx;
u32 heap_size = seq->payload->dma.size;
uintptr_t heap_phys_base = seq->payload->dma.phys;
u8 *heap_virt_base = seq->payload->dma.virt;
u32 heap_offset = 0;
/* Build the FC header reusing the RQ header DMA buffer */
memset(&hdr, 0, sizeof(hdr));
hdr.fh_r_ctl = r_ctl;
/* send it back to whomever sent it to us */
memcpy(hdr.fh_d_id, req_hdr->fh_s_id, sizeof(hdr.fh_d_id));
memcpy(hdr.fh_s_id, req_hdr->fh_d_id, sizeof(hdr.fh_s_id));
hdr.fh_type = type;
hton24(hdr.fh_f_ctl, f_ctl);
hdr.fh_ox_id = req_hdr->fh_ox_id;
hdr.fh_rx_id = req_hdr->fh_rx_id;
hdr.fh_cs_ctl = 0;
hdr.fh_df_ctl = 0;
hdr.fh_seq_cnt = 0;
hdr.fh_parm_offset = 0;
/*
* send_frame_seq_id is an atomic, we just let it increment,
* while storing only the low 8 bits to hdr->seq_id
*/
hdr.fh_seq_id = (u8)atomic_add_return(1, &hw->send_frame_seq_id);
hdr.fh_seq_id--;
/* Allocate and fill in the send frame request context */
ctx = (void *)(heap_virt_base + heap_offset);
heap_offset += sizeof(*ctx);
if (heap_offset > heap_size) {
efc_log_err(efct, "Fill send frame failed offset %d size %d\n",
heap_offset, heap_size);
return -EIO;
}
memset(ctx, 0, sizeof(*ctx));
/* Save sequence */
ctx->seq = seq;
/* Allocate a response payload DMA buffer from the heap */
ctx->payload.phys = heap_phys_base + heap_offset;
ctx->payload.virt = heap_virt_base + heap_offset;
ctx->payload.size = payload_len;
ctx->payload.len = payload_len;
heap_offset += payload_len;
if (heap_offset > heap_size) {
efc_log_err(efct, "Fill send frame failed offset %d size %d\n",
heap_offset, heap_size);
return -EIO;
}
/* Copy the payload in */
memcpy(ctx->payload.virt, payload, payload_len);
/* Send */
rc = efct_hw_send_frame(&efct->hw, (void *)&hdr, FC_SOF_N3,
FC_EOF_T, &ctx->payload, ctx,
efct_sframe_common_send_cb, ctx);
if (rc)
efc_log_debug(efct, "efct_hw_send_frame failed: %d\n", rc);
return rc;
}
static int
efct_sframe_send_fcp_rsp(struct efct_node *node, struct efc_hw_sequence *seq,
void *rsp, u32 rsp_len)
{
return efct_sframe_common_send(node, seq, FC_RCTL_DD_CMD_STATUS,
FC_FC_EX_CTX |
FC_FC_LAST_SEQ |
FC_FC_END_SEQ |
FC_FC_SEQ_INIT,
FC_TYPE_FCP,
rsp, rsp_len);
}
static int
efct_sframe_send_task_set_full_or_busy(struct efct_node *node,
struct efc_hw_sequence *seq)
{
struct fcp_resp_with_ext fcprsp;
struct fcp_cmnd *fcpcmd = seq->payload->dma.virt;
int rc = 0;
unsigned long flags = 0;
struct efct *efct = node->efct;
/* construct task set full or busy response */
memset(&fcprsp, 0, sizeof(fcprsp));
spin_lock_irqsave(&node->active_ios_lock, flags);
fcprsp.resp.fr_status = list_empty(&node->active_ios) ?
SAM_STAT_BUSY : SAM_STAT_TASK_SET_FULL;
spin_unlock_irqrestore(&node->active_ios_lock, flags);
*((u32 *)&fcprsp.ext.fr_resid) = be32_to_cpu(fcpcmd->fc_dl);
/* send it using send_frame */
rc = efct_sframe_send_fcp_rsp(node, seq, &fcprsp, sizeof(fcprsp));
if (rc)
efc_log_debug(efct, "efct_sframe_send_fcp_rsp failed %d\n", rc);
return rc;
}
int
efct_dispatch_fcp_cmd(struct efct_node *node, struct efc_hw_sequence *seq)
{
struct efct *efct = node->efct;
struct fc_frame_header *fchdr = seq->header->dma.virt;
struct fcp_cmnd *cmnd = NULL;
struct efct_io *io = NULL;
u32 lun;
if (!seq->payload) {
efc_log_err(efct, "Sequence payload is NULL.\n");
return -EIO;
}
cmnd = seq->payload->dma.virt;
/* perform FCP_CMND validation check(s) */
if (efct_validate_fcp_cmd(efct, seq))
return -EIO;
lun = scsilun_to_int(&cmnd->fc_lun);
if (lun == U32_MAX)
return -EIO;
io = efct_scsi_io_alloc(node);
if (!io) {
int rc;
/* Use SEND_FRAME to send task set full or busy */
rc = efct_sframe_send_task_set_full_or_busy(node, seq);
if (rc)
efc_log_err(efct, "Failed to send busy task: %d\n", rc);
return rc;
}
io->hw_priv = seq->hw_priv;
io->app_id = 0;
/* RQ pair, if we got here, SIT=1 */
efct_populate_io_fcp_cmd(io, cmnd, fchdr, true);
if (cmnd->fc_tm_flags) {
efct_dispatch_unsol_tmf(io, cmnd->fc_tm_flags, lun);
} else {
u32 flags = efct_get_flags_fcp_cmd(cmnd);
if (cmnd->fc_flags & FCP_CFL_LEN_MASK) {
efc_log_err(efct, "Additional CDB not supported\n");
return -EIO;
}
/*
* Can return failure for things like task set full and UAs,
* no need to treat as a dropped frame if rc != 0
*/
efct_scsi_recv_cmd(io, lun, cmnd->fc_cdb,
sizeof(cmnd->fc_cdb), flags);
}
return 0;
}
static int
efct_process_abts(struct efct_io *io, struct fc_frame_header *hdr)
{
struct efct_node *node = io->node;
struct efct *efct = io->efct;
u16 ox_id = be16_to_cpu(hdr->fh_ox_id);
u16 rx_id = be16_to_cpu(hdr->fh_rx_id);
struct efct_io *abortio;
/* Find IO and attempt to take a reference on it */
abortio = efct_io_find_tgt_io(efct, node, ox_id, rx_id);
if (abortio) {
/* Got a reference on the IO. Hold it until backend
* is notified below
*/
efc_log_info(node->efct, "Abort ox_id [%04x] rx_id [%04x]\n",
ox_id, rx_id);
/*
* Save the ox_id for the ABTS as the init_task_tag in our
* manufactured
* TMF IO object
*/
io->display_name = "abts";
io->init_task_tag = ox_id;
/* don't set tgt_task_tag, don't want to confuse with XRI */
/*
* Save the rx_id from the ABTS as it is
* needed for the BLS response,
* regardless of the IO context's rx_id
*/
io->abort_rx_id = rx_id;
/* Call target server command abort */
io->tmf_cmd = EFCT_SCSI_TMF_ABORT_TASK;
efct_scsi_recv_tmf(io, abortio->tgt_io.lun,
EFCT_SCSI_TMF_ABORT_TASK, abortio, 0);
/*
* Backend will have taken an additional
* reference on the IO if needed;
* done with current reference.
*/
kref_put(&abortio->ref, abortio->release);
} else {
/*
* Either IO was not found or it has been
* freed between finding it
* and attempting to get the reference,
*/
efc_log_info(node->efct, "Abort: ox_id [%04x], IO not found\n",
ox_id);
/* Send a BA_RJT */
efct_bls_send_rjt(io, hdr);
}
return 0;
}
int
efct_node_recv_abts_frame(struct efct_node *node, struct efc_hw_sequence *seq)
{
struct efct *efct = node->efct;
struct fc_frame_header *hdr = seq->header->dma.virt;
struct efct_io *io = NULL;
node->abort_cnt++;
io = efct_scsi_io_alloc(node);
if (io) {
io->hw_priv = seq->hw_priv;
/* If we got this far, SIT=1 */
io->seq_init = 1;
/* fill out generic fields */
io->efct = efct;
io->node = node;
io->cmd_tgt = true;
efct_process_abts(io, seq->header->dma.virt);
} else {
efc_log_err(efct,
"SCSI IO allocation failed for ABTS received ");
efc_log_err(efct, "s_id %06x d_id %06x ox_id %04x rx_id %04x\n",
ntoh24(hdr->fh_s_id), ntoh24(hdr->fh_d_id),
be16_to_cpu(hdr->fh_ox_id),
be16_to_cpu(hdr->fh_rx_id));
}
return 0;
}
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