diff options
author | Bart Van Assche <bvanassche@acm.org> | 2018-12-17 13:20:35 -0800 |
---|---|---|
committer | Doug Ledford <dledford@redhat.com> | 2018-12-19 15:07:25 -0500 |
commit | 482fffc43c032ec09dd9ee792a546b36e973dcef (patch) | |
tree | b7b7343b360e0dfb07da676692e8da9584d0a812 /drivers/infiniband | |
parent | e37df2d5b569390e3b80ebed9a73fd5b9dcda010 (diff) |
RDMA/srp: Handle large SCSI CDBs correctly
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>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 23 | ||||
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.h | 2 |
2 files changed, 19 insertions, 6 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index fbf701c0a514..ef8d55dca136 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -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); diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index a2706086b9c7..d6c116a53d5e 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.h +++ b/drivers/infiniband/ulp/srp/ib_srp.h @@ -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 { |