diff options
| -rw-r--r-- | drivers/target/target_core_user.c | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 0b29e4f00bce..89b75ce563d8 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -602,6 +602,27 @@ static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd, return true; } +static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt) +{ + return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]), + sizeof(struct tcmu_cmd_entry)); +} + +static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd, + size_t base_command_size) +{ + struct se_cmd *se_cmd = tcmu_cmd->se_cmd; + size_t command_size; + + command_size = base_command_size + + round_up(scsi_command_size(se_cmd->t_task_cdb), + TCMU_OP_ALIGN_SIZE); + + WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); + + return command_size; +} + static sense_reason_t tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) { @@ -624,16 +645,16 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) * Must be a certain minimum size for response sense info, but * also may be larger if the iov array is large. * - * We prepare way too many iovs for potential uses here, because it's - * expensive to tell how many regions are freed in the bitmap - */ - base_command_size = max(offsetof(struct tcmu_cmd_entry, - req.iov[tcmu_cmd_get_block_cnt(tcmu_cmd)]), - sizeof(struct tcmu_cmd_entry)); - command_size = base_command_size - + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE); - - WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1)); + * We prepare as many iovs as possbile for potential uses here, + * because it's expensive to tell how many regions are freed in + * the bitmap & global data pool, as the size calculated here + * will only be used to do the checks. + * + * The size will be recalculated later as actually needed to save + * cmd area memories. + */ + base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt); + command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); mutex_lock(&udev->cmdr_lock); @@ -694,7 +715,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) entry = (void *) mb + CMDR_OFF + cmd_head; tcmu_flush_dcache_range(entry, sizeof(*entry)); tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD); - tcmu_hdr_set_len(&entry->hdr.len_op, command_size); entry->hdr.cmd_id = tcmu_cmd->cmd_id; entry->hdr.kflags = 0; entry->hdr.uflags = 0; @@ -736,6 +756,16 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) entry->req.iov_bidi_cnt = iov_cnt; } + /* + * Recalaulate the command's base size and size according + * to the actual needs + */ + base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt + + entry->req.iov_bidi_cnt); + command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size); + + tcmu_hdr_set_len(&entry->hdr.len_op, command_size); + /* All offsets relative to mb_addr, not start of entry! */ cdb_off = CMDR_OFF + cmd_head + base_command_size; memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb)); |