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Merge branch 'external-indirect' of git://git.kernel.org/pub/scm/linux/kernel/git/dad/srp-initiator into srp

This commit is contained in:
Roland Dreier 2011-03-21 11:52:00 -07:00
parent 7b7adc4a01 be8b981453
commit 071c778347
2 changed files with 524 additions and 259 deletions
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745
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -59,25 +59,31 @@ MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
"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;
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)");
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, uint, 0444);
MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
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);
@ -114,14 +120,6 @@ static int srp_target_is_topspin(struct srp_target_port *target)
!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)
@ -378,7 +376,7 @@ static int srp_send_req(struct srp_target_port *target)
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);
/*
@ -456,6 +454,24 @@ static bool srp_change_state(struct srp_target_port *target,
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 =
@ -472,6 +488,7 @@ static void srp_remove_work(struct work_struct *work)
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);
}
@ -535,18 +552,20 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
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,
@ -645,96 +664,151 @@ err:
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)
{
struct srp_direct_buf *desc = state->desc;
desc->va = cpu_to_be64(dma_addr);
desc->key = cpu_to_be32(rkey);
desc->len = cpu_to_be32(dma_len);
state->total_len += dma_len;
state->desc++;
state->ndesc++;
}
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;
u64 *dma_pages;
u32 len;
int page_cnt;
int i, j;
int ret;
if (!state->npages)
return 0;
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;
}
fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
state->npages, io_addr);
if (IS_ERR(fmr))
return PTR_ERR(fmr);
*state->next_fmr++ = fmr;
state->nfmr++;
srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
state->npages = state->fmr_len = 0;
return 0;
}
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;
struct scatterlist *sg;
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 (!dev->fmr_pool)
return -ENODEV;
if (!dma_len)
return 0;
if (srp_target_is_mellanox(target) &&
(ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
return -EINVAL;
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;
}
len = page_cnt = 0;
scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
/* 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;
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;
srp_map_desc(state, dma_addr, dma_len, target->rkey);
srp_map_update_start(state, NULL, 0, 0);
return 0;
}
/* 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);
while (dma_len) {
if (state->npages == SRP_FMR_SIZE) {
ret = srp_map_finish_fmr(state, target);
if (ret)
return ret;
srp_map_update_start(state, sg, sg_index, dma_addr);
}
len += dma_len;
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;
}
page_cnt += len >> dev->fmr_page_shift;
if (page_cnt > SRP_FMR_SIZE)
return -ENOMEM;
dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
if (!dma_pages)
return -ENOMEM;
page_cnt = 0;
scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
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;
}
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;
}
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 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;
out:
kfree(dma_pages);
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);
@ -754,6 +828,8 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
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);
@ -770,49 +846,99 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
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;
}
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
cmd->data_out_desc_cnt = count;
else
cmd->data_in_desc_cnt = count;
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));
buf->len = cpu_to_be32(datalen);
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 (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
goto backtrack;
/* 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 = 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
@ -1140,7 +1266,7 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
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;
@ -1164,7 +1290,7 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
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)) {
@ -1204,7 +1330,7 @@ static int srp_alloc_iu_bufs(struct srp_target_port *target)
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;
@ -1228,6 +1354,78 @@ 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)
@ -1311,11 +1509,7 @@ static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
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:
@ -1327,71 +1521,7 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
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:
@ -1431,8 +1561,6 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
if (comp)
complete(&target->done);
kfree(qp_attr);
return 0;
}
@ -1658,6 +1786,22 @@ static ssize_t show_local_ib_device(struct device *dev,
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);
@ -1668,6 +1812,8 @@ static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, 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,
@ -1680,6 +1826,8 @@ static struct device_attribute *srp_host_attrs[] = {
&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
};
@ -1692,6 +1840,7 @@ static struct scsi_host_template srp_template = {
.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,
@ -1763,6 +1912,9 @@ enum {
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 |
@ -1780,6 +1932,9 @@ static const match_table_t srp_opt_tokens = {
{ 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 }
};
@ -1907,6 +2062,31 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
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);
@ -1937,39 +2117,73 @@ static ssize_t srp_create_target(struct device *dev,
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;
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);
}
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;
ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
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) {
struct srp_request *req = &target->req_ring[i];
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(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 "
@ -1982,11 +2196,11 @@ static ssize_t srp_create_target(struct device *dev,
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);
@ -2008,9 +2222,12 @@ err_disconnect:
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);
@ -2083,7 +2300,7 @@ static void srp_add_one(struct ib_device *device)
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)
@ -2101,12 +2318,13 @@ static void srp_add_one(struct ib_device *device)
/*
* 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);
@ -2122,17 +2340,24 @@ static void srp_add_one(struct ib_device *device)
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);
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;
}
srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
if (IS_ERR(srp_dev->fmr_pool))
srp_dev->fmr_pool = NULL;
@ -2207,6 +2432,7 @@ static void srp_remove_one(struct ib_device *device)
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);
}
@ -2230,9 +2456,25 @@ static int __init srp_init_module(void)
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 =
@ -2240,11 +2482,6 @@ static int __init srp_init_module(void)
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");

38
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -69,9 +69,13 @@ enum {
SRP_TAG_NO_REQ = ~0U,
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_FMR_SIZE = 256,
SRP_FMR_SIZE = 512,
SRP_FMR_MIN_SIZE = 128,
SRP_FMR_POOL_SIZE = 1024,
SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4
SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4,
SRP_MAP_ALLOW_FMR = 0,
SRP_MAP_NO_FMR = 1,
};
enum srp_target_state {
@ -93,9 +97,9 @@ struct srp_device {
struct ib_pd *pd;
struct ib_mr *mr;
struct ib_fmr_pool *fmr_pool;
int fmr_page_shift;
int fmr_page_size;
u64 fmr_page_mask;
int fmr_page_size;
int fmr_max_size;
};
struct srp_host {
@ -112,7 +116,11 @@ struct srp_request {
struct list_head list;
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
struct ib_pool_fmr *fmr;
struct ib_pool_fmr **fmr_list;
u64 *map_page;
struct srp_direct_buf *indirect_desc;
dma_addr_t indirect_dma_addr;
short nfmr;
short index;
};
@ -130,6 +138,10 @@ struct srp_target_port {
u32 lkey;
u32 rkey;
enum srp_target_state state;
unsigned int max_iu_len;
unsigned int cmd_sg_cnt;
unsigned int indirect_size;
bool allow_ext_sg;
/* Everything above this point is used in the hot path of
* command processing. Try to keep them packed into cachelines.
@ -144,6 +156,7 @@ struct srp_target_port {
struct Scsi_Host *scsi_host;
char target_name[32];
unsigned int scsi_id;
unsigned int sg_tablesize;
struct ib_sa_path_rec path;
__be16 orig_dgid[8];
@ -179,4 +192,19 @@ struct srp_iu {
enum dma_data_direction direction;
};
struct srp_map_state {
struct ib_pool_fmr **next_fmr;
struct srp_direct_buf *desc;
u64 *pages;
dma_addr_t base_dma_addr;
u32 fmr_len;
u32 total_len;
unsigned int npages;
unsigned int nfmr;
unsigned int ndesc;
struct scatterlist *unmapped_sg;
int unmapped_index;
dma_addr_t unmapped_addr;
};
#endif /* IB_SRP_H */