target/rd: Add DIF protection into rd_execute_rw
This patch adds support for DIF protection into rd_execute_rw() code for WRITE/READ I/O using sbc_dif_verify_[write,read]() logic. It also adds rd_get_prot_table() for locating protection SGLs assoicated with the ramdisk backend device. v2 changes: - Make rd_execute_rw() to u32 sectors count instead of sector_t - Drop SCF_PROT usage Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -356,6 +356,26 @@ static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
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return NULL;
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}
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static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
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{
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struct rd_dev_sg_table *sg_table;
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u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
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sizeof(struct scatterlist));
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i = page / sg_per_table;
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if (i < rd_dev->sg_prot_count) {
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sg_table = &rd_dev->sg_prot_array[i];
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if ((sg_table->page_start_offset <= page) &&
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(sg_table->page_end_offset >= page))
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return sg_table;
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}
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pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
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page);
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return NULL;
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}
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static sense_reason_t
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rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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enum dma_data_direction data_direction)
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@ -370,6 +390,7 @@ rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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u32 rd_page;
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u32 src_len;
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u64 tmp;
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sense_reason_t rc;
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if (dev->rd_flags & RDF_NULLIO) {
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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@ -392,6 +413,28 @@ rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
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cmd->t_task_lba, rd_size, rd_page, rd_offset);
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if (cmd->prot_type && data_direction == DMA_TO_DEVICE) {
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struct rd_dev_sg_table *prot_table;
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struct scatterlist *prot_sg;
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u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
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u32 prot_offset, prot_page;
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tmp = cmd->t_task_lba * se_dev->prot_length;
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prot_offset = do_div(tmp, PAGE_SIZE);
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prot_page = tmp;
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prot_table = rd_get_prot_table(dev, prot_page);
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if (!prot_table)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
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rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0,
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prot_sg, prot_offset);
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if (rc)
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return rc;
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}
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src_len = PAGE_SIZE - rd_offset;
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sg_miter_start(&m, sgl, sgl_nents,
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data_direction == DMA_FROM_DEVICE ?
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@ -453,6 +496,28 @@ rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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}
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sg_miter_stop(&m);
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if (cmd->prot_type && data_direction == DMA_FROM_DEVICE) {
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struct rd_dev_sg_table *prot_table;
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struct scatterlist *prot_sg;
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u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
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u32 prot_offset, prot_page;
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tmp = cmd->t_task_lba * se_dev->prot_length;
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prot_offset = do_div(tmp, PAGE_SIZE);
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prot_page = tmp;
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prot_table = rd_get_prot_table(dev, prot_page);
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if (!prot_table)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
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rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
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prot_sg, prot_offset);
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if (rc)
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return rc;
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}
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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