redonkable/alistair23-linux
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RDMA/srp: Handle large SCSI CDBs correctly

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Reserve additional space for CDBs that contain more than sixteen bytes
and set the add_cdb_len field for such CDBs as required. From the SRP
standard: "The ADDITIONAL CDB LENGTH field contains the length in
dwords of the ADDITIONAL CDB field."

Cc: Sergey Gorenko <sergeygo@mellanox.com>
Cc: Max Gurtovoy <maxg@mellanox.com>
Cc: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2018-12-17 13:20:35 -08:00 committed by Doug Ledford
parent e37df2d5b5
commit 482fffc43c
2 changed files with 19 additions and 6 deletions
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23
drivers/infiniband/ulp/srp/ib_srp.c
View file

@ -1782,7 +1782,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
u8 fmt;
if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
return sizeof (struct srp_cmd);
return sizeof(struct srp_cmd) + cmd->add_cdb_len;
if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
scmnd->sc_data_direction != DMA_TO_DEVICE) {
@ -1803,7 +1803,8 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
return -EIO;
fmt = SRP_DATA_DESC_DIRECT;
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
len = sizeof(struct srp_cmd) + cmd->add_cdb_len +
sizeof(struct srp_direct_buf);
if (count == 1 && target->global_rkey) {
/*
@ -1812,8 +1813,9 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
* single entry. So a direct descriptor along with
* the DMA MR suffices.
*/
struct srp_direct_buf *buf = (void *) cmd->add_data;
struct srp_direct_buf *buf;
buf = (void *)cmd->add_data + cmd->add_cdb_len;
buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
buf->key = cpu_to_be32(target->global_rkey);
buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
@ -1826,7 +1828,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
* We have more than one scatter/gather entry, so build our indirect
* descriptor table, trying to merge as many entries as we can.
*/
indirect_hdr = (void *) cmd->add_data;
indirect_hdr = (void *)cmd->add_data + cmd->add_cdb_len;
ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
target->indirect_size, DMA_TO_DEVICE);
@ -1861,8 +1863,9 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
* Memory registration collapsed the sg-list into one entry,
* so use a direct descriptor.
*/
struct srp_direct_buf *buf = (void *) cmd->add_data;
struct srp_direct_buf *buf;
buf = (void *)cmd->add_data + cmd->add_cdb_len;
*buf = req->indirect_desc[0];
goto map_complete;
}
@ -1880,7 +1883,8 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
idb_len = sizeof(struct srp_indirect_buf) + table_len;
fmt = SRP_DATA_DESC_INDIRECT;
len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
len = sizeof(struct srp_cmd) + cmd->add_cdb_len +
sizeof(struct srp_indirect_buf);
len += count * sizeof (struct srp_direct_buf);
memcpy(indirect_hdr->desc_list, req->indirect_desc,
@ -2324,6 +2328,12 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
int_to_scsilun(scmnd->device->lun, &cmd->lun);
cmd->tag = tag;
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
if (unlikely(scmnd->cmd_len > sizeof(cmd->cdb))) {
cmd->add_cdb_len = round_up(scmnd->cmd_len - sizeof(cmd->cdb),
4);
if (WARN_ON_ONCE(cmd->add_cdb_len > SRP_MAX_ADD_CDB_LEN))
goto err_iu;
}
req->scmnd = scmnd;
req->cmd = iu;
@ -3829,6 +3839,7 @@ static ssize_t srp_create_target(struct device *dev,
target->indirect_size = target->sg_tablesize *
sizeof (struct srp_direct_buf);
target->max_iu_len = sizeof (struct srp_cmd) +
SRP_MAX_ADD_CDB_LEN +
sizeof (struct srp_indirect_buf) +
target->cmd_sg_cnt * sizeof (struct srp_direct_buf);

2
drivers/infiniband/ulp/srp/ib_srp.h
View file

@ -67,6 +67,8 @@ enum {
SRP_TAG_TSK_MGMT = 1U << 31,
SRP_MAX_PAGES_PER_MR = 512,
SRP_MAX_ADD_CDB_LEN = 16,
};
enum srp_target_state {