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skd: Use a structure instead of hardcoding structure offsets
This change makes the source code easier to read. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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6507f436f9
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1 changed files with 22 additions and 19 deletions
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@ -181,6 +181,11 @@ enum skd_check_status_action {
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SKD_CHECK_STATUS_BUSY_IMMINENT,
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};
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struct skd_msg_buf {
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struct fit_msg_hdr fmh;
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struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
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};
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struct skd_fitmsg_context {
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enum skd_fit_msg_state state;
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@ -191,7 +196,7 @@ struct skd_fitmsg_context {
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u32 length;
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u8 *msg_buf;
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struct skd_msg_buf *msg_buf;
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dma_addr_t mb_dma_address;
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};
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@ -231,7 +236,7 @@ struct skd_special_context {
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void *data_buf;
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dma_addr_t db_dma_address;
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u8 *msg_buf;
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struct skd_msg_buf *msg_buf;
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dma_addr_t mb_dma_address;
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};
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@ -520,7 +525,6 @@ static void skd_request_fn(struct request_queue *q)
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__be64 be_dmaa;
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u64 cmdctxt;
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u32 timo_slot;
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void *cmd_ptr;
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int flush, fua;
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if (skdev->state != SKD_DRVR_STATE_ONLINE) {
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@ -639,7 +643,7 @@ static void skd_request_fn(struct request_queue *q)
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skmsg->id += SKD_ID_INCR;
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/* Initialize the FIT msg header */
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fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
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fmh = &skmsg->msg_buf->fmh;
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memset(fmh, 0, sizeof(*fmh));
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fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
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skmsg->length = sizeof(*fmh);
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@ -647,13 +651,13 @@ static void skd_request_fn(struct request_queue *q)
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skreq->fitmsg_id = skmsg->id;
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cmd_ptr = &skmsg->msg_buf[skmsg->length];
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memset(cmd_ptr, 0, 32);
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scsi_req =
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&skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
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memset(scsi_req, 0, sizeof(*scsi_req));
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be_dmaa = cpu_to_be64(skreq->sksg_dma_address);
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cmdctxt = skreq->id + SKD_ID_INCR;
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scsi_req = cmd_ptr;
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scsi_req->hdr.tag = cmdctxt;
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scsi_req->hdr.sg_list_dma_address = be_dmaa;
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@ -1549,8 +1553,8 @@ static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
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struct skd_sg_io *sksgio)
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{
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struct skd_special_context *skspcl = sksgio->skspcl;
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struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
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struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
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struct fit_msg_hdr *fmh = &skspcl->msg_buf->fmh;
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struct skd_scsi_request *scsi_req = &skspcl->msg_buf->scsi[0];
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memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
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@ -1709,11 +1713,11 @@ static int skd_format_internal_skspcl(struct skd_device *skdev)
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uint64_t dma_address;
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struct skd_scsi_request *scsi;
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fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
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fmh = &skspcl->msg_buf->fmh;
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fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
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fmh->num_protocol_cmds_coalesced = 1;
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scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
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scsi = &skspcl->msg_buf->scsi[0];
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memset(scsi, 0, sizeof(*scsi));
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dma_address = skspcl->req.sksg_dma_address;
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scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
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@ -1748,7 +1752,7 @@ static void skd_send_internal_skspcl(struct skd_device *skdev,
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skspcl->req.state = SKD_REQ_STATE_BUSY;
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skspcl->req.id += SKD_ID_INCR;
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scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
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scsi = &skspcl->msg_buf->scsi[0];
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scsi->hdr.tag = skspcl->req.id;
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memset(scsi->cdb, 0, sizeof(scsi->cdb));
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@ -1853,8 +1857,7 @@ static void skd_complete_internal(struct skd_device *skdev,
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u8 *buf = skspcl->data_buf;
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u8 status;
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int i;
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struct skd_scsi_request *scsi =
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(struct skd_scsi_request *)&skspcl->msg_buf[64];
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struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0];
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lockdep_assert_held(&skdev->lock);
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@ -2020,7 +2023,7 @@ static void skd_send_fitmsg(struct skd_device *skdev,
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qcmd = skmsg->mb_dma_address;
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qcmd |= FIT_QCMD_QID_NORMAL;
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fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
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fmh = &skmsg->msg_buf->fmh;
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skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
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if (unlikely(skdev->dbg_level > 1)) {
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@ -2501,8 +2504,7 @@ static void skd_process_scsi_inq(struct skd_device *skdev,
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struct skd_special_context *skspcl)
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{
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uint8_t *buf;
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struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
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struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
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struct skd_scsi_request *scsi_req = &skspcl->msg_buf->scsi[0];
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dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
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skspcl->req.sg_data_dir);
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@ -4957,8 +4959,9 @@ static void skd_log_skreq(struct skd_device *skdev,
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static int __init skd_init(void)
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{
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BUILD_BUG_ON(sizeof(struct fit_msg_hdr) + SKD_MAX_REQ_PER_MSG *
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sizeof(struct skd_scsi_request) != SKD_N_FITMSG_BYTES);
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BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
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BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
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BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
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pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);
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