From 18213afbd8cee9f8a3ac5294dedf543a06559c8b Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Fri, 1 May 2015 15:23:51 +0900 Subject: [PATCH] target: handle odd SG mapping for data transfer memory sbc_dif_generate() and sbc_dif_verify() currently assume that each SG element for data transfer memory doesn't straddle the block size boundary. However, when using SG_IO ioctl, we can choose the data transfer memory which doesn't satisfy that alignment requirement. In order to handle such cases correctly, this change inverts the outer loop to iterate data transfer memory and the inner loop to iterate protection information and enables to calculate CRC for a block which straddles multiple SG elements. Signed-off-by: Akinobu Mita Cc: Tim Chen Cc: Herbert Xu Cc: "David S. Miller" Cc: linux-crypto@vger.kernel.org Cc: Nicholas Bellinger Cc: Sagi Grimberg Cc: "Martin K. Petersen" Cc: Christoph Hellwig Cc: "James E.J. Bottomley" Cc: target-devel@vger.kernel.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_sbc.c | 124 +++++++++++++++++++++---------- 1 file changed, 84 insertions(+), 40 deletions(-) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index d615a11dc9c9..31b2ae356120 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -1183,27 +1183,50 @@ sbc_dif_generate(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; struct se_dif_v1_tuple *sdt; - struct scatterlist *dsg, *psg = cmd->t_prot_sg; + struct scatterlist *dsg = cmd->t_data_sg, *psg; sector_t sector = cmd->t_task_lba; void *daddr, *paddr; int i, j, offset = 0; + unsigned int block_size = dev->dev_attrib.block_size; - for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { - daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; + for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { paddr = kmap_atomic(sg_page(psg)) + psg->offset; + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; - for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { + for (j = 0; j < psg->length; + j += sizeof(struct se_dif_v1_tuple)) { + __u16 crc; + unsigned int avail; - if (offset >= psg->length) { - kunmap_atomic(paddr); - psg = sg_next(psg); - paddr = kmap_atomic(sg_page(psg)) + psg->offset; - offset = 0; + if (offset >= dsg->length) { + offset -= dsg->length; + kunmap_atomic(daddr - dsg->offset); + dsg = sg_next(dsg); + if (!dsg) { + kunmap_atomic(paddr - psg->offset); + return; + } + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; } - sdt = paddr + offset; - sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, - dev->dev_attrib.block_size)); + sdt = paddr + j; + avail = min(block_size, dsg->length - offset); + crc = crc_t10dif(daddr + offset, avail); + if (avail < block_size) { + kunmap_atomic(daddr - dsg->offset); + dsg = sg_next(dsg); + if (!dsg) { + kunmap_atomic(paddr - psg->offset); + return; + } + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; + offset = block_size - avail; + crc = crc_t10dif_update(crc, daddr, offset); + } else { + offset += block_size; + } + + sdt->guard_tag = cpu_to_be16(crc); if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); sdt->app_tag = 0; @@ -1216,26 +1239,23 @@ sbc_dif_generate(struct se_cmd *cmd) be32_to_cpu(sdt->ref_tag)); sector++; - offset += sizeof(struct se_dif_v1_tuple); } - kunmap_atomic(paddr); - kunmap_atomic(daddr); + kunmap_atomic(daddr - dsg->offset); + kunmap_atomic(paddr - psg->offset); } } static sense_reason_t sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt, - const void *p, sector_t sector, unsigned int ei_lba) + __u16 crc, sector_t sector, unsigned int ei_lba) { - struct se_device *dev = cmd->se_dev; - int block_size = dev->dev_attrib.block_size; __be16 csum; if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) goto check_ref; - csum = cpu_to_be16(crc_t10dif(p, block_size)); + csum = cpu_to_be16(crc); if (sdt->guard_tag != csum) { pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" @@ -1318,26 +1338,36 @@ sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, { struct se_device *dev = cmd->se_dev; struct se_dif_v1_tuple *sdt; - struct scatterlist *dsg; + struct scatterlist *dsg = cmd->t_data_sg; sector_t sector = start; void *daddr, *paddr; - int i, j; + int i; sense_reason_t rc; + int dsg_off = 0; + unsigned int block_size = dev->dev_attrib.block_size; - for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { - daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; + for (; psg && sector < start + sectors; psg = sg_next(psg)) { paddr = kmap_atomic(sg_page(psg)) + psg->offset; + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; - for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { + for (i = psg_off; i < psg->length && + sector < start + sectors; + i += sizeof(struct se_dif_v1_tuple)) { + __u16 crc; + unsigned int avail; - if (psg_off >= psg->length) { - kunmap_atomic(paddr - psg->offset); - psg = sg_next(psg); - paddr = kmap_atomic(sg_page(psg)) + psg->offset; - psg_off = 0; + if (dsg_off >= dsg->length) { + dsg_off -= dsg->length; + kunmap_atomic(daddr - dsg->offset); + dsg = sg_next(dsg); + if (!dsg) { + kunmap_atomic(paddr - psg->offset); + return 0; + } + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; } - sdt = paddr + psg_off; + sdt = paddr + i; pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" " app_tag: 0x%04x ref_tag: %u\n", @@ -1345,27 +1375,41 @@ sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, sdt->app_tag, be32_to_cpu(sdt->ref_tag)); if (sdt->app_tag == cpu_to_be16(0xffff)) { - sector++; - psg_off += sizeof(struct se_dif_v1_tuple); - continue; + dsg_off += block_size; + goto next; } - rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector, - ei_lba); - if (rc) { - kunmap_atomic(paddr - psg->offset); + avail = min(block_size, dsg->length - dsg_off); + crc = crc_t10dif(daddr + dsg_off, avail); + if (avail < block_size) { kunmap_atomic(daddr - dsg->offset); + dsg = sg_next(dsg); + if (!dsg) { + kunmap_atomic(paddr - psg->offset); + return 0; + } + daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; + dsg_off = block_size - avail; + crc = crc_t10dif_update(crc, daddr, dsg_off); + } else { + dsg_off += block_size; + } + + rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); + if (rc) { + kunmap_atomic(daddr - dsg->offset); + kunmap_atomic(paddr - psg->offset); cmd->bad_sector = sector; return rc; } - +next: sector++; ei_lba++; - psg_off += sizeof(struct se_dif_v1_tuple); } - kunmap_atomic(paddr - psg->offset); + psg_off = 0; kunmap_atomic(daddr - dsg->offset); + kunmap_atomic(paddr - psg->offset); } return 0;