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Date: Sun, 19 Jan 2014 14:37:24 +0200
From: Sagi Grimberg <sagig@....mellanox.co.il>
To: "Nicholas A. Bellinger" <nab@...erainc.com>,
target-devel <target-devel@...r.kernel.org>
CC: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
Sagi Grimberg <sagig@...lanox.com>,
Or Gerlitz <ogerlitz@...lanox.com>,
Roland Dreier <roland@...nel.org>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH-v2 13/17] target/file: Add DIF protection support to fd_execute_rw
On 1/19/2014 4:44 AM, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@...ux-iscsi.org>
>
> This patch adds support for DIF protection into fd_execute_rw() code
> for WRITE/READ I/O using sbc_dif_verify_[write,read]() logic.
>
> It adds fd_do_prot_rw() for handling interface with FILEIO PI, and
> uses a locally allocated fd_prot->prot_buf + fd_prot->prot_sg for
> interacting with SBC DIF verify emulation code.
>
> Cc: Martin K. Petersen <martin.petersen@...cle.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Hannes Reinecke <hare@...e.de>
> Cc: Sagi Grimberg <sagig@...lanox.com>
> Cc: Or Gerlitz <ogerlitz@...lanox.com>
> Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
> ---
> drivers/target/target_core_file.c | 119 ++++++++++++++++++++++++++++++++++++-
> drivers/target/target_core_file.h | 5 ++
> 2 files changed, 123 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
> index 119d519..aaba7c5 100644
> --- a/drivers/target/target_core_file.c
> +++ b/drivers/target/target_core_file.c
> @@ -257,6 +257,72 @@ static void fd_free_device(struct se_device *dev)
> kfree(fd_dev);
> }
>
> +static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot,
> + int is_write)
> +{
> + struct se_device *se_dev = cmd->se_dev;
> + struct fd_dev *dev = FD_DEV(se_dev);
> + struct file *prot_fd = dev->fd_prot_file;
> + struct scatterlist *sg;
> + loff_t pos = (cmd->t_task_lba * se_dev->prot_length);
> + unsigned char *buf;
> + u32 prot_size, len, size;
> + int rc, ret = 1, i;
> +
> + prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) *
> + se_dev->prot_length;
> +
> + if (!is_write) {
> + fd_prot->prot_buf = vzalloc(prot_size);
> + if (!fd_prot->prot_buf) {
> + pr_err("Unable to allocate fd_prot->prot_buf\n");
> + return -ENOMEM;
> + }
> + buf = fd_prot->prot_buf;
> +
> + fd_prot->prot_sg_nents = cmd->t_prot_nents;
> + fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) *
> + fd_prot->prot_sg_nents, GFP_KERNEL);
> + if (!fd_prot->prot_sg) {
> + pr_err("Unable to allocate fd_prot->prot_sg\n");
> + vfree(fd_prot->prot_buf);
> + return -ENOMEM;
> + }
> + size = prot_size;
> +
> + for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) {
> +
> + len = min_t(u32, PAGE_SIZE, size);
> + sg_set_buf(sg, buf, len);
> + size -= len;
> + buf += len;
> + }
> + }
> +
> + if (is_write) {
> + rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos);
> + if (rc < 0 || prot_size != rc) {
> + pr_err("kernel_write() for fd_do_prot_rw failed:"
> + " %d\n", rc);
> + ret = -EINVAL;
> + }
> + } else {
> + rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size);
> + if (rc < 0) {
> + pr_err("kernel_read() for fd_do_prot_rw failed:"
> + " %d\n", rc);
> + ret = -EINVAL;
> + }
> + }
> +
> + if (is_write || ret < 0) {
> + kfree(fd_prot->prot_sg);
> + vfree(fd_prot->prot_buf);
> + }
> +
> + return ret;
> +}
> +
> static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
> u32 sgl_nents, int is_write)
> {
> @@ -551,6 +617,8 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
> enum dma_data_direction data_direction)
> {
> struct se_device *dev = cmd->se_dev;
> + struct fd_prot fd_prot;
> + sense_reason_t rc;
> int ret = 0;
>
> /*
> @@ -558,8 +626,48 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
> * physical memory addresses to struct iovec virtual memory.
> */
> if (data_direction == DMA_FROM_DEVICE) {
Maybe its better to export this one to a separate function?
fd_execute_prot_rw()? just a nit...
> + memset(&fd_prot, 0, sizeof(struct fd_prot));
> +
> + if (cmd->prot_type) {
> + ret = fd_do_prot_rw(cmd, &fd_prot, false);
> + if (ret < 0)
> + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
> + }
> +
> ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
> +
> + if (ret > 0 && cmd->prot_type) {
> + u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
> +
> + rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors,
> + 0, fd_prot.prot_sg, 0);
> + if (rc) {
> + kfree(fd_prot.prot_sg);
> + vfree(fd_prot.prot_buf);
> + return rc;
> + }
> + kfree(fd_prot.prot_sg);
> + vfree(fd_prot.prot_buf);
> + }
> } else {
> + memset(&fd_prot, 0, sizeof(struct fd_prot));
> +
> + if (cmd->prot_type) {
> + u32 sectors = cmd->data_length / dev->dev_attrib.block_size;
> +
> + ret = fd_do_prot_rw(cmd, &fd_prot, false);
> + if (ret < 0)
> + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
> +
> + rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors,
> + 0, fd_prot.prot_sg, 0);
> + if (rc) {
> + kfree(fd_prot.prot_sg);
> + vfree(fd_prot.prot_buf);
> + return rc;
> + }
> + }
> +
> ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
> /*
> * Perform implicit vfs_fsync_range() for fd_do_writev() ops
> @@ -576,10 +684,19 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
>
> vfs_fsync_range(fd_dev->fd_file, start, end, 1);
> }
> +
> + if (ret > 0 && cmd->prot_type) {
> + ret = fd_do_prot_rw(cmd, &fd_prot, true);
> + if (ret < 0)
> + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
> + }
> }
>
> - if (ret < 0)
> + if (ret < 0) {
> + kfree(fd_prot.prot_sg);
> + vfree(fd_prot.prot_buf);
> return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
> + }
>
> if (ret)
> target_complete_cmd(cmd, SAM_STAT_GOOD);
> diff --git a/drivers/target/target_core_file.h b/drivers/target/target_core_file.h
> index 583691e..97e5e7d 100644
> --- a/drivers/target/target_core_file.h
> +++ b/drivers/target/target_core_file.h
> @@ -18,6 +18,11 @@
> #define FDBD_HAS_BUFFERED_IO_WCE 0x04
> #define FDBD_FORMAT_UNIT_SIZE 2048
>
> +struct fd_prot {
> + unsigned char *prot_buf;
> + struct scatterlist *prot_sg;
> + u32 prot_sg_nents;
> +};
>
> struct fd_dev {
> struct se_device dev;
--
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