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IB/srp: Register the indirect data buffer descriptor

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Instead of always using the global rkey for the indirect data
buffer descriptor, register that descriptor with the HCA if
the kernel module parameter register_always has been set to Y.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2015-08-10 17:09:05 -07:00 committed by Doug Ledford
parent 002f15674c
commit 330179f2fa
2 changed files with 58 additions and 3 deletions
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57
drivers/infiniband/ulp/srp/ib_srp.c
View file

@ -1453,18 +1453,58 @@ out:
return ret;
}
/*
* Register the indirect data buffer descriptor with the HCA.
*
* Note: since the indirect data buffer descriptor has been allocated with
* kmalloc() it is guaranteed that this buffer is a physically contiguous
* memory buffer.
*/
static int srp_map_idb(struct srp_rdma_ch *ch, struct srp_request *req,
void **next_mr, void **end_mr, u32 idb_len,
__be32 *idb_rkey)
{
struct srp_target_port *target = ch->target;
struct srp_device *dev = target->srp_host->srp_dev;
struct srp_map_state state;
struct srp_direct_buf idb_desc;
u64 idb_pages[1];
int ret;
memset(&state, 0, sizeof(state));
memset(&idb_desc, 0, sizeof(idb_desc));
state.gen.next = next_mr;
state.gen.end = end_mr;
state.desc = &idb_desc;
state.pages = idb_pages;
state.pages[0] = (req->indirect_dma_addr &
dev->mr_page_mask);
state.npages = 1;
state.base_dma_addr = req->indirect_dma_addr;
state.dma_len = idb_len;
ret = srp_finish_mapping(&state, ch);
if (ret < 0)
goto out;
*idb_rkey = idb_desc.key;
out:
return ret;
}
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
struct srp_request *req)
{
struct srp_target_port *target = ch->target;
struct scatterlist *scat;
struct srp_cmd *cmd = req->cmd->buf;
int len, nents, count;
int len, nents, count, ret;
struct srp_device *dev;
struct ib_device *ibdev;
struct srp_map_state state;
struct srp_indirect_buf *indirect_hdr;
u32 table_len;
u32 idb_len, table_len;
__be32 idb_rkey;
u8 fmt;
if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
@ -1546,6 +1586,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
count = min(state.ndesc, target->cmd_sg_cnt);
table_len = state.ndesc * sizeof (struct srp_direct_buf);
idb_len = sizeof(struct srp_indirect_buf) + table_len;
fmt = SRP_DATA_DESC_INDIRECT;
len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
@ -1554,8 +1595,18 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
memcpy(indirect_hdr->desc_list, req->indirect_desc,
count * sizeof (struct srp_direct_buf));
if (register_always && (dev->use_fast_reg || dev->use_fmr)) {
ret = srp_map_idb(ch, req, state.gen.next, state.gen.end,
idb_len, &idb_rkey);
if (ret < 0)
return ret;
req->nmdesc++;
} else {
idb_rkey = target->rkey;
}
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.key = idb_rkey;
indirect_hdr->table_desc.len = cpu_to_be32(table_len);
indirect_hdr->len = cpu_to_be32(state.total_len);

4
drivers/infiniband/ulp/srp/ib_srp.h
View file

@ -288,6 +288,10 @@ struct srp_map_state {
struct srp_fr_desc **next;
struct srp_fr_desc **end;
} fr;
struct {
void **next;
void **end;
} gen;
};
struct srp_direct_buf *desc;
u64 *pages;