"v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");
-static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
-static int srp_max_iu_len;
+static unsigned int srp_sg_tablesize;
+static unsigned int cmd_sg_entries;
+static unsigned int indirect_sg_entries;
+static bool allow_ext_sg;
+static int topspin_workarounds = 1;
-module_param(srp_sg_tablesize, int, 0444);
-MODULE_PARM_DESC(srp_sg_tablesize,
- "Max number of gather/scatter entries per I/O (default is 12, max 255)");
+module_param(srp_sg_tablesize, uint, 0444);
+MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
-static int topspin_workarounds = 1;
+module_param(cmd_sg_entries, uint, 0444);
+MODULE_PARM_DESC(cmd_sg_entries,
+ "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
+
+module_param(indirect_sg_entries, uint, 0444);
+MODULE_PARM_DESC(indirect_sg_entries,
+ "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
+
+module_param(allow_ext_sg, bool, 0444);
+MODULE_PARM_DESC(allow_ext_sg,
+ "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
module_param(topspin_workarounds, int, 0444);
MODULE_PARM_DESC(topspin_workarounds,
"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
-static int mellanox_workarounds = 1;
-
-module_param(mellanox_workarounds, int, 0444);
-MODULE_PARM_DESC(mellanox_workarounds,
- "Enable workarounds for Mellanox SRP target bugs if != 0");
-
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
!memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
}
-static int srp_target_is_mellanox(struct srp_target_port *target)
-{
- static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
-
- return mellanox_workarounds &&
- !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
-}
-
static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
gfp_t gfp_mask,
enum dma_data_direction direction)
req->priv.opcode = SRP_LOGIN_REQ;
req->priv.tag = 0;
- req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
+ req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
/*
return changed;
}
+static void srp_free_req_data(struct srp_target_port *target)
+{
+ struct ib_device *ibdev = target->srp_host->srp_dev->dev;
+ struct srp_request *req;
+ int i;
+
+ for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
+ kfree(req->fmr_list);
+ kfree(req->map_page);
+ if (req->indirect_dma_addr) {
+ ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
+ target->indirect_size,
+ DMA_TO_DEVICE);
+ }
+ kfree(req->indirect_desc);
+ }
+}
+
static void srp_remove_work(struct work_struct *work)
{
struct srp_target_port *target =
scsi_remove_host(target->scsi_host);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
+ srp_free_req_data(target);
scsi_host_put(target->scsi_host);
}
struct srp_target_port *target,
struct srp_request *req)
{
+ struct ib_device *ibdev = target->srp_host->srp_dev->dev;
+ struct ib_pool_fmr **pfmr;
+
if (!scsi_sglist(scmnd) ||
(scmnd->sc_data_direction != DMA_TO_DEVICE &&
scmnd->sc_data_direction != DMA_FROM_DEVICE))
return;
- if (req->fmr) {
- ib_fmr_pool_unmap(req->fmr);
- req->fmr = NULL;
- }
+ pfmr = req->fmr_list;
+ while (req->nfmr--)
+ ib_fmr_pool_unmap(*pfmr++);
- ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
- scsi_sg_count(scmnd), scmnd->sc_data_direction);
+ ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
+ scmnd->sc_data_direction);
}
static void srp_remove_req(struct srp_target_port *target,
return ret;
}
-static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
- int sg_cnt, struct srp_request *req,
- struct srp_direct_buf *buf)
+static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
+ unsigned int dma_len, u32 rkey)
{
- u64 io_addr = 0;
- u64 *dma_pages;
- u32 len;
- int page_cnt;
- int i, j;
- int ret;
- struct srp_device *dev = target->srp_host->srp_dev;
- struct ib_device *ibdev = dev->dev;
- struct scatterlist *sg;
+ struct srp_direct_buf *desc = state->desc;
- if (!dev->fmr_pool)
- return -ENODEV;
+ desc->va = cpu_to_be64(dma_addr);
+ desc->key = cpu_to_be32(rkey);
+ desc->len = cpu_to_be32(dma_len);
- if (srp_target_is_mellanox(target) &&
- (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
- return -EINVAL;
+ state->total_len += dma_len;
+ state->desc++;
+ state->ndesc++;
+}
- len = page_cnt = 0;
- scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
+static int srp_map_finish_fmr(struct srp_map_state *state,
+ struct srp_target_port *target)
+{
+ struct srp_device *dev = target->srp_host->srp_dev;
+ struct ib_pool_fmr *fmr;
+ u64 io_addr = 0;
- if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
- if (i > 0)
- return -EINVAL;
- else
- ++page_cnt;
- }
- if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
- ~dev->fmr_page_mask) {
- if (i < sg_cnt - 1)
- return -EINVAL;
- else
- ++page_cnt;
- }
+ if (!state->npages)
+ return 0;
- len += dma_len;
+ if (state->npages == 1) {
+ srp_map_desc(state, state->base_dma_addr, state->fmr_len,
+ target->rkey);
+ state->npages = state->fmr_len = 0;
+ return 0;
}
- page_cnt += len >> dev->fmr_page_shift;
- if (page_cnt > SRP_FMR_SIZE)
- return -ENOMEM;
+ fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
+ state->npages, io_addr);
+ if (IS_ERR(fmr))
+ return PTR_ERR(fmr);
- dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
- if (!dma_pages)
- return -ENOMEM;
+ *state->next_fmr++ = fmr;
+ state->nfmr++;
- page_cnt = 0;
- scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
+ srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
+ state->npages = state->fmr_len = 0;
+ return 0;
+}
- for (j = 0; j < dma_len; j += dev->fmr_page_size)
- dma_pages[page_cnt++] =
- (ib_sg_dma_address(ibdev, sg) &
- dev->fmr_page_mask) + j;
+static void srp_map_update_start(struct srp_map_state *state,
+ struct scatterlist *sg, int sg_index,
+ dma_addr_t dma_addr)
+{
+ state->unmapped_sg = sg;
+ state->unmapped_index = sg_index;
+ state->unmapped_addr = dma_addr;
+}
+
+static int srp_map_sg_entry(struct srp_map_state *state,
+ struct srp_target_port *target,
+ struct scatterlist *sg, int sg_index,
+ int use_fmr)
+{
+ struct srp_device *dev = target->srp_host->srp_dev;
+ struct ib_device *ibdev = dev->dev;
+ dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
+ unsigned int len;
+ int ret;
+
+ if (!dma_len)
+ return 0;
+
+ if (use_fmr == SRP_MAP_NO_FMR) {
+ /* Once we're in direct map mode for a request, we don't
+ * go back to FMR mode, so no need to update anything
+ * other than the descriptor.
+ */
+ srp_map_desc(state, dma_addr, dma_len, target->rkey);
+ return 0;
}
- req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
- dma_pages, page_cnt, io_addr);
- if (IS_ERR(req->fmr)) {
- ret = PTR_ERR(req->fmr);
- req->fmr = NULL;
- goto out;
+ /* If we start at an offset into the FMR page, don't merge into
+ * the current FMR. Finish it out, and use the kernel's MR for this
+ * sg entry. This is to avoid potential bugs on some SRP targets
+ * that were never quite defined, but went away when the initiator
+ * avoided using FMR on such page fragments.
+ */
+ if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
+ ret = srp_map_finish_fmr(state, target);
+ if (ret)
+ return ret;
+
+ srp_map_desc(state, dma_addr, dma_len, target->rkey);
+ srp_map_update_start(state, NULL, 0, 0);
+ return 0;
}
- buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
- ~dev->fmr_page_mask);
- buf->key = cpu_to_be32(req->fmr->fmr->rkey);
- buf->len = cpu_to_be32(len);
+ /* If this is the first sg to go into the FMR, save our position.
+ * We need to know the first unmapped entry, its index, and the
+ * first unmapped address within that entry to be able to restart
+ * mapping after an error.
+ */
+ if (!state->unmapped_sg)
+ srp_map_update_start(state, sg, sg_index, dma_addr);
- ret = 0;
+ while (dma_len) {
+ if (state->npages == SRP_FMR_SIZE) {
+ ret = srp_map_finish_fmr(state, target);
+ if (ret)
+ return ret;
-out:
- kfree(dma_pages);
+ srp_map_update_start(state, sg, sg_index, dma_addr);
+ }
+
+ len = min_t(unsigned int, dma_len, dev->fmr_page_size);
+ if (!state->npages)
+ state->base_dma_addr = dma_addr;
+ state->pages[state->npages++] = dma_addr;
+ state->fmr_len += len;
+ dma_addr += len;
+ dma_len -= len;
+ }
+
+ /* If the last entry of the FMR wasn't a full page, then we need to
+ * close it out and start a new one -- we can only merge at page
+ * boundries.
+ */
+ ret = 0;
+ if (len != dev->fmr_page_size) {
+ ret = srp_map_finish_fmr(state, target);
+ if (!ret)
+ srp_map_update_start(state, NULL, 0, 0);
+ }
return ret;
}
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
struct srp_request *req)
{
- struct scatterlist *scat;
+ struct scatterlist *scat, *sg;
struct srp_cmd *cmd = req->cmd->buf;
- int len, nents, count;
- u8 fmt = SRP_DATA_DESC_DIRECT;
+ int i, len, nents, count, use_fmr;
struct srp_device *dev;
struct ib_device *ibdev;
+ struct srp_map_state state;
+ struct srp_indirect_buf *indirect_hdr;
+ u32 table_len;
+ u8 fmt;
if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
return sizeof (struct srp_cmd);
ibdev = dev->dev;
count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
+ if (unlikely(count == 0))
+ return -EIO;
fmt = SRP_DATA_DESC_DIRECT;
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
buf->key = cpu_to_be32(target->rkey);
buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
- } else if (srp_map_fmr(target, scat, count, req,
- (void *) cmd->add_data)) {
- /*
- * FMR mapping failed, and the scatterlist has more
- * than one entry. Generate an indirect memory
- * descriptor.
- */
- struct srp_indirect_buf *buf = (void *) cmd->add_data;
- struct scatterlist *sg;
- u32 datalen = 0;
- int i;
-
- fmt = SRP_DATA_DESC_INDIRECT;
- len = sizeof (struct srp_cmd) +
- sizeof (struct srp_indirect_buf) +
- count * sizeof (struct srp_direct_buf);
-
- scsi_for_each_sg(scmnd, sg, count, i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
-
- buf->desc_list[i].va =
- cpu_to_be64(ib_sg_dma_address(ibdev, sg));
- buf->desc_list[i].key =
- cpu_to_be32(target->rkey);
- buf->desc_list[i].len = cpu_to_be32(dma_len);
- datalen += dma_len;
+
+ req->nfmr = 0;
+ goto map_complete;
+ }
+
+ /* We have more than one scatter/gather entry, so build our indirect
+ * descriptor table, trying to merge as many entries with FMR as we
+ * can.
+ */
+ indirect_hdr = (void *) cmd->add_data;
+
+ ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
+ target->indirect_size, DMA_TO_DEVICE);
+
+ memset(&state, 0, sizeof(state));
+ state.desc = req->indirect_desc;
+ state.pages = req->map_page;
+ state.next_fmr = req->fmr_list;
+
+ use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
+
+ for_each_sg(scat, sg, count, i) {
+ if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
+ /* FMR mapping failed, so backtrack to the first
+ * unmapped entry and continue on without using FMR.
+ */
+ dma_addr_t dma_addr;
+ unsigned int dma_len;
+
+backtrack:
+ sg = state.unmapped_sg;
+ i = state.unmapped_index;
+
+ dma_addr = ib_sg_dma_address(ibdev, sg);
+ dma_len = ib_sg_dma_len(ibdev, sg);
+ dma_len -= (state.unmapped_addr - dma_addr);
+ dma_addr = state.unmapped_addr;
+ use_fmr = SRP_MAP_NO_FMR;
+ srp_map_desc(&state, dma_addr, dma_len, target->rkey);
}
+ }
- if (scmnd->sc_data_direction == DMA_TO_DEVICE)
- cmd->data_out_desc_cnt = count;
- else
- cmd->data_in_desc_cnt = count;
+ if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
+ goto backtrack;
- buf->table_desc.va =
- cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
- buf->table_desc.key =
- cpu_to_be32(target->rkey);
- buf->table_desc.len =
- cpu_to_be32(count * sizeof (struct srp_direct_buf));
+ /* We've mapped the request, now pull as much of the indirect
+ * descriptor table as we can into the command buffer. If this
+ * target is not using an external indirect table, we are
+ * guaranteed to fit into the command, as the SCSI layer won't
+ * give us more S/G entries than we allow.
+ */
+ req->nfmr = state.nfmr;
+ if (state.ndesc == 1) {
+ /* FMR mapping was able to collapse this to one entry,
+ * so use a direct descriptor.
+ */
+ struct srp_direct_buf *buf = (void *) cmd->add_data;
- buf->len = cpu_to_be32(datalen);
+ *buf = req->indirect_desc[0];
+ goto map_complete;
+ }
+
+ if (unlikely(target->cmd_sg_cnt < state.ndesc &&
+ !target->allow_ext_sg)) {
+ shost_printk(KERN_ERR, target->scsi_host,
+ "Could not fit S/G list into SRP_CMD\n");
+ return -EIO;
}
+ count = min(state.ndesc, target->cmd_sg_cnt);
+ table_len = state.ndesc * sizeof (struct srp_direct_buf);
+
+ fmt = SRP_DATA_DESC_INDIRECT;
+ len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
+ len += count * sizeof (struct srp_direct_buf);
+
+ memcpy(indirect_hdr->desc_list, req->indirect_desc,
+ count * sizeof (struct srp_direct_buf));
+
+ indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
+ indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
+ indirect_hdr->table_desc.len = cpu_to_be32(table_len);
+ indirect_hdr->len = cpu_to_be32(state.total_len);
+
+ if (scmnd->sc_data_direction == DMA_TO_DEVICE)
+ cmd->data_out_desc_cnt = count;
+ else
+ cmd->data_in_desc_cnt = count;
+
+ ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
+ DMA_TO_DEVICE);
+
+map_complete:
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
cmd->buf_fmt = fmt << 4;
else
spin_unlock_irqrestore(&target->lock, flags);
dev = target->srp_host->srp_dev->dev;
- ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
+ ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
DMA_TO_DEVICE);
scmnd->result = 0;
goto err_iu;
}
- ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
+ ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
DMA_TO_DEVICE);
if (srp_post_send(target, iu, len)) {
for (i = 0; i < SRP_SQ_SIZE; ++i) {
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
- srp_max_iu_len,
+ target->max_iu_len,
GFP_KERNEL, DMA_TO_DEVICE);
if (!target->tx_ring[i])
goto err;
return -ENOMEM;
}
+static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
+ struct srp_login_rsp *lrsp,
+ struct srp_target_port *target)
+{
+ struct ib_qp_attr *qp_attr = NULL;
+ int attr_mask = 0;
+ int ret;
+ int i;
+
+ if (lrsp->opcode == SRP_LOGIN_RSP) {
+ target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
+ target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
+
+ /*
+ * Reserve credits for task management so we don't
+ * bounce requests back to the SCSI mid-layer.
+ */
+ target->scsi_host->can_queue
+ = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
+ target->scsi_host->can_queue);
+ } else {
+ shost_printk(KERN_WARNING, target->scsi_host,
+ PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
+ ret = -ECONNRESET;
+ goto error;
+ }
+
+ if (!target->rx_ring[0]) {
+ ret = srp_alloc_iu_bufs(target);
+ if (ret)
+ goto error;
+ }
+
+ ret = -ENOMEM;
+ qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
+ if (!qp_attr)
+ goto error;
+
+ qp_attr->qp_state = IB_QPS_RTR;
+ ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (ret)
+ goto error_free;
+
+ ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
+ if (ret)
+ goto error_free;
+
+ for (i = 0; i < SRP_RQ_SIZE; i++) {
+ struct srp_iu *iu = target->rx_ring[i];
+ ret = srp_post_recv(target, iu);
+ if (ret)
+ goto error_free;
+ }
+
+ qp_attr->qp_state = IB_QPS_RTS;
+ ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (ret)
+ goto error_free;
+
+ ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
+ if (ret)
+ goto error_free;
+
+ ret = ib_send_cm_rtu(cm_id, NULL, 0);
+
+error_free:
+ kfree(qp_attr);
+
+error:
+ target->status = ret;
+}
+
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event,
struct srp_target_port *target)
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
struct srp_target_port *target = cm_id->context;
- struct ib_qp_attr *qp_attr = NULL;
- int attr_mask = 0;
int comp = 0;
- int opcode = 0;
- int i;
switch (event->event) {
case IB_CM_REQ_ERROR:
case IB_CM_REP_RECEIVED:
comp = 1;
- opcode = *(u8 *) event->private_data;
-
- if (opcode == SRP_LOGIN_RSP) {
- struct srp_login_rsp *rsp = event->private_data;
-
- target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
- target->req_lim = be32_to_cpu(rsp->req_lim_delta);
-
- /*
- * Reserve credits for task management so we don't
- * bounce requests back to the SCSI mid-layer.
- */
- target->scsi_host->can_queue
- = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
- target->scsi_host->can_queue);
- } else {
- shost_printk(KERN_WARNING, target->scsi_host,
- PFX "Unhandled RSP opcode %#x\n", opcode);
- target->status = -ECONNRESET;
- break;
- }
-
- if (!target->rx_ring[0]) {
- target->status = srp_alloc_iu_bufs(target);
- if (target->status)
- break;
- }
-
- qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
- if (!qp_attr) {
- target->status = -ENOMEM;
- break;
- }
-
- qp_attr->qp_state = IB_QPS_RTR;
- target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
- if (target->status)
- break;
-
- target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
- if (target->status)
- break;
-
- for (i = 0; i < SRP_RQ_SIZE; i++) {
- struct srp_iu *iu = target->rx_ring[i];
- target->status = srp_post_recv(target, iu);
- if (target->status)
- break;
- }
- if (target->status)
- break;
-
- qp_attr->qp_state = IB_QPS_RTS;
- target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
- if (target->status)
- break;
-
- target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
- if (target->status)
- break;
-
- target->status = ib_send_cm_rtu(cm_id, NULL, 0);
- if (target->status)
- break;
-
+ srp_cm_rep_handler(cm_id, event->private_data, target);
break;
case IB_CM_REJ_RECEIVED:
if (comp)
complete(&target->done);
- kfree(qp_attr);
-
return 0;
}
return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
}
+static ssize_t show_cmd_sg_entries(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct srp_target_port *target = host_to_target(class_to_shost(dev));
+
+ return sprintf(buf, "%u\n", target->cmd_sg_cnt);
+}
+
+static ssize_t show_allow_ext_sg(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct srp_target_port *target = host_to_target(class_to_shost(dev));
+
+ return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
+}
+
static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
+static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
+static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
static struct device_attribute *srp_host_attrs[] = {
&dev_attr_id_ext,
&dev_attr_zero_req_lim,
&dev_attr_local_ib_port,
&dev_attr_local_ib_device,
+ &dev_attr_cmd_sg_entries,
+ &dev_attr_allow_ext_sg,
NULL
};
.eh_abort_handler = srp_abort,
.eh_device_reset_handler = srp_reset_device,
.eh_host_reset_handler = srp_reset_host,
+ .sg_tablesize = SRP_DEF_SG_TABLESIZE,
.can_queue = SRP_CMD_SQ_SIZE,
.this_id = -1,
.cmd_per_lun = SRP_CMD_SQ_SIZE,
SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
SRP_OPT_IO_CLASS = 1 << 7,
SRP_OPT_INITIATOR_EXT = 1 << 8,
+ SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
+ SRP_OPT_ALLOW_EXT_SG = 1 << 10,
+ SRP_OPT_SG_TABLESIZE = 1 << 11,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
{ SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
{ SRP_OPT_IO_CLASS, "io_class=%x" },
{ SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
+ { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
+ { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
+ { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
{ SRP_OPT_ERR, NULL }
};
kfree(p);
break;
+ case SRP_OPT_CMD_SG_ENTRIES:
+ if (match_int(args, &token) || token < 1 || token > 255) {
+ printk(KERN_WARNING PFX "bad max cmd_sg_entries parameter '%s'\n", p);
+ goto out;
+ }
+ target->cmd_sg_cnt = token;
+ break;
+
+ case SRP_OPT_ALLOW_EXT_SG:
+ if (match_int(args, &token)) {
+ printk(KERN_WARNING PFX "bad allow_ext_sg parameter '%s'\n", p);
+ goto out;
+ }
+ target->allow_ext_sg = !!token;
+ break;
+
+ case SRP_OPT_SG_TABLESIZE:
+ if (match_int(args, &token) || token < 1 ||
+ token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
+ printk(KERN_WARNING PFX "bad max sg_tablesize parameter '%s'\n", p);
+ goto out;
+ }
+ target->sg_tablesize = token;
+ break;
+
default:
printk(KERN_WARNING PFX "unknown parameter or missing value "
"'%s' in target creation request\n", p);
container_of(dev, struct srp_host, dev);
struct Scsi_Host *target_host;
struct srp_target_port *target;
- int ret;
- int i;
+ struct ib_device *ibdev = host->srp_dev->dev;
+ dma_addr_t dma_addr;
+ int i, ret;
target_host = scsi_host_alloc(&srp_template,
sizeof (struct srp_target_port));
if (!target_host)
return -ENOMEM;
- target_host->transportt = ib_srp_transport_template;
+ target_host->transportt = ib_srp_transport_template;
target_host->max_lun = SRP_MAX_LUN;
target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
target = host_to_target(target_host);
- target->io_class = SRP_REV16A_IB_IO_CLASS;
- target->scsi_host = target_host;
- target->srp_host = host;
- target->lkey = host->srp_dev->mr->lkey;
- target->rkey = host->srp_dev->mr->rkey;
+ target->io_class = SRP_REV16A_IB_IO_CLASS;
+ target->scsi_host = target_host;
+ target->srp_host = host;
+ target->lkey = host->srp_dev->mr->lkey;
+ target->rkey = host->srp_dev->mr->rkey;
+ target->cmd_sg_cnt = cmd_sg_entries;
+ target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
+ target->allow_ext_sg = allow_ext_sg;
+
+ ret = srp_parse_options(buf, target);
+ if (ret)
+ goto err;
+
+ if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
+ target->cmd_sg_cnt < target->sg_tablesize) {
+ printk(KERN_WARNING PFX "No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
+ target->sg_tablesize = target->cmd_sg_cnt;
+ }
+
+ target_host->sg_tablesize = target->sg_tablesize;
+ target->indirect_size = target->sg_tablesize *
+ sizeof (struct srp_direct_buf);
+ target->max_iu_len = sizeof (struct srp_cmd) +
+ sizeof (struct srp_indirect_buf) +
+ target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
spin_lock_init(&target->lock);
INIT_LIST_HEAD(&target->free_tx);
INIT_LIST_HEAD(&target->free_reqs);
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
- target->req_ring[i].index = i;
- list_add_tail(&target->req_ring[i].list, &target->free_reqs);
- }
+ struct srp_request *req = &target->req_ring[i];
- ret = srp_parse_options(buf, target);
- if (ret)
- goto err;
+ req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
+ GFP_KERNEL);
+ req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
+ GFP_KERNEL);
+ req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
+ if (!req->fmr_list || !req->map_page || !req->indirect_desc)
+ goto err_free_mem;
+
+ dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
+ target->indirect_size,
+ DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ibdev, dma_addr))
+ goto err_free_mem;
+
+ req->indirect_dma_addr = dma_addr;
+ req->index = i;
+ list_add_tail(&req->list, &target->free_reqs);
+ }
- ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
+ ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
shost_printk(KERN_DEBUG, target->scsi_host, PFX
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
ret = srp_create_target_ib(target);
if (ret)
- goto err;
+ goto err_free_mem;
ret = srp_new_cm_id(target);
if (ret)
- goto err_free;
+ goto err_free_ib;
target->qp_in_error = 0;
ret = srp_connect_target(target);
err_cm_id:
ib_destroy_cm_id(target->cm_id);
-err_free:
+err_free_ib:
srp_free_target_ib(target);
+err_free_mem:
+ srp_free_req_data(target);
+
err:
scsi_host_put(target_host);
struct ib_device_attr *dev_attr;
struct ib_fmr_pool_param fmr_param;
struct srp_host *host;
- int s, e, p;
+ int max_pages_per_fmr, fmr_page_shift, s, e, p;
dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
if (!dev_attr)
/*
* Use the smallest page size supported by the HCA, down to a
- * minimum of 512 bytes (which is the smallest sector that a
- * SCSI command will ever carry).
+ * minimum of 4096 bytes. We're unlikely to build large sglists
+ * out of smaller entries.
*/
- srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
- srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
- srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
+ fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
+ srp_dev->fmr_page_size = 1 << fmr_page_shift;
+ srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
+ srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
INIT_LIST_HEAD(&srp_dev->dev_list);
if (IS_ERR(srp_dev->mr))
goto err_pd;
- memset(&fmr_param, 0, sizeof fmr_param);
- fmr_param.pool_size = SRP_FMR_POOL_SIZE;
- fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
- fmr_param.cache = 1;
- fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
- fmr_param.page_shift = srp_dev->fmr_page_shift;
- fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_WRITE |
- IB_ACCESS_REMOTE_READ);
-
- srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
+ for (max_pages_per_fmr = SRP_FMR_SIZE;
+ max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
+ max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
+ memset(&fmr_param, 0, sizeof fmr_param);
+ fmr_param.pool_size = SRP_FMR_POOL_SIZE;
+ fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
+ fmr_param.cache = 1;
+ fmr_param.max_pages_per_fmr = max_pages_per_fmr;
+ fmr_param.page_shift = fmr_page_shift;
+ fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
+
+ srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
+ if (!IS_ERR(srp_dev->fmr_pool))
+ break;
+ }
+
if (IS_ERR(srp_dev->fmr_pool))
srp_dev->fmr_pool = NULL;
srp_disconnect_target(target);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
+ srp_free_req_data(target);
scsi_host_put(target->scsi_host);
}
BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
- if (srp_sg_tablesize > 255) {
- printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
- srp_sg_tablesize = 255;
+ if (srp_sg_tablesize) {
+ printk(KERN_WARNING PFX "srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
+ if (!cmd_sg_entries)
+ cmd_sg_entries = srp_sg_tablesize;
+ }
+
+ if (!cmd_sg_entries)
+ cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
+
+ if (cmd_sg_entries > 255) {
+ printk(KERN_WARNING PFX "Clamping cmd_sg_entries to 255\n");
+ cmd_sg_entries = 255;
+ }
+
+ if (!indirect_sg_entries)
+ indirect_sg_entries = cmd_sg_entries;
+ else if (indirect_sg_entries < cmd_sg_entries) {
+ printk(KERN_WARNING PFX "Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n", cmd_sg_entries);
+ indirect_sg_entries = cmd_sg_entries;
}
ib_srp_transport_template =
if (!ib_srp_transport_template)
return -ENOMEM;
- srp_template.sg_tablesize = srp_sg_tablesize;
- srp_max_iu_len = (sizeof (struct srp_cmd) +
- sizeof (struct srp_indirect_buf) +
- srp_sg_tablesize * 16);
-
ret = class_register(&srp_class);
if (ret) {
printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
git.openpandora.org / pandora-kernel.git / commitdiff