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Petersen" , Mike Christie , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Cc: Bodo Stroesser Subject: [RFC PATCH 5/8] scsi: target: tcmu: Factor out new helper ring_insert_padding Date: Tue, 30 Jun 2020 12:47:06 +0200 Message-Id: <20200630104709.23066-6-bstroesser@ts.fujitsu.com> X-Mailer: git-send-email 2.12.3 In-Reply-To: <20200630104709.23066-1-bstroesser@ts.fujitsu.com> References: <20200630104709.23066-1-bstroesser@ts.fujitsu.com> Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org The new helper ring_insert_padding is split off from and then called by queue_cmd_ring. It inserts a padding if necessary. The new helper will in a further patch be used during writing of TMR notifications to command ring. Signed-off-by: Bodo Stroesser --- drivers/target/target_core_user.c | 51 +++++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 21 deletions(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index be95518a31dd..f10d8d182ed9 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -926,6 +926,34 @@ static int add_to_qfull_queue(struct tcmu_cmd *tcmu_cmd) return 0; } +static uint32_t ring_insert_padding(struct tcmu_dev *dev, size_t cmd_size) +{ + struct tcmu_cmd_entry_hdr *hdr; + struct tcmu_mailbox *mb = dev->mb_addr; + uint32_t cmd_head = mb->cmd_head % dev->cmdr_size; /* UAM */ + + /* Insert a PAD if end-of-ring space is too small */ + if (head_to_end(cmd_head, dev->cmdr_size) < cmd_size) { + size_t pad_size = head_to_end(cmd_head, dev->cmdr_size); + + hdr = (void *) mb + CMDR_OFF + cmd_head; + tcmu_hdr_set_op(&hdr->len_op, TCMU_OP_PAD); + tcmu_hdr_set_len(&hdr->len_op, pad_size); + hdr->cmd_id = 0; /* not used for PAD */ + hdr->kflags = 0; + hdr->uflags = 0; + tcmu_flush_dcache_range(hdr, sizeof(*hdr)); + + UPDATE_HEAD(mb->cmd_head, pad_size, dev->cmdr_size); + tcmu_flush_dcache_range(mb, sizeof(*mb)); + + cmd_head = mb->cmd_head % dev->cmdr_size; /* UAM */ + WARN_ON(cmd_head != 0); + } + + return cmd_head; +} + /** * queue_cmd_ring - queue cmd to ring or internally * @tcmu_cmd: cmd to queue @@ -941,7 +969,7 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) struct tcmu_dev *udev = tcmu_cmd->tcmu_dev; struct se_cmd *se_cmd = tcmu_cmd->se_cmd; size_t base_command_size, command_size; - struct tcmu_mailbox *mb; + struct tcmu_mailbox *mb = udev->mb_addr; struct tcmu_cmd_entry *entry; struct iovec *iov; int iov_cnt, cmd_id; @@ -980,8 +1008,6 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) if (!list_empty(&udev->qfull_queue)) goto queue; - mb = udev->mb_addr; - cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ if ((command_size > (udev->cmdr_size / 2)) || data_length > udev->data_size) { pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu " @@ -1001,24 +1027,7 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err) goto queue; } - /* Insert a PAD if end-of-ring space is too small */ - if (head_to_end(cmd_head, udev->cmdr_size) < command_size) { - size_t pad_size = head_to_end(cmd_head, udev->cmdr_size); - - entry = (void *) mb + CMDR_OFF + cmd_head; - tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD); - tcmu_hdr_set_len(&entry->hdr.len_op, pad_size); - entry->hdr.cmd_id = 0; /* not used for PAD */ - entry->hdr.kflags = 0; - entry->hdr.uflags = 0; - tcmu_flush_dcache_range(entry, sizeof(entry->hdr)); - - UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size); - tcmu_flush_dcache_range(mb, sizeof(*mb)); - - cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */ - WARN_ON(cmd_head != 0); - } + cmd_head = ring_insert_padding(udev, command_size); entry = (void *) mb + CMDR_OFF + cmd_head; memset(entry, 0, command_size);