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RDMA/srpt: Report the SCSI residual to the initiator

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The code added by this patch is similar to the code that already exists in
ibmvscsis_determine_resid(). This patch has been tested by running the
following command:

strace sg_raw -r 1k /dev/sdb 12 00 00 00 60 00 -o inquiry.bin |&
    grep resid=

Link: https://lore.kernel.org/r/20191105214632.183302-1-bvanassche@acm.org
Fixes: a42d985bd5b2 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Honggang Li <honli@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Bart Van Assche 2019-11-05 13:46:32 -08:00 committed by Jason Gunthorpe
parent 208d70f562
commit e88982ad1b
1 changed files with 24 additions and 0 deletions
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24
drivers/infiniband/ulp/srpt/ib_srpt.c
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@ -1362,9 +1362,11 @@ static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx, u64 tag,
int status)
{
struct se_cmd *cmd = &ioctx->cmd;
struct srp_rsp *srp_rsp;
const u8 *sense_data;
int sense_data_len, max_sense_len;
u32 resid = cmd->residual_count;
/*
* The lowest bit of all SAM-3 status codes is zero (see also
@ -1386,6 +1388,28 @@ static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
srp_rsp->tag = tag;
srp_rsp->status = status;
if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
if (cmd->data_direction == DMA_TO_DEVICE) {
/* residual data from an underflow write */
srp_rsp->flags = SRP_RSP_FLAG_DOUNDER;
srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
} else if (cmd->data_direction == DMA_FROM_DEVICE) {
/* residual data from an underflow read */
srp_rsp->flags = SRP_RSP_FLAG_DIUNDER;
srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
}
} else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
if (cmd->data_direction == DMA_TO_DEVICE) {
/* residual data from an overflow write */
srp_rsp->flags = SRP_RSP_FLAG_DOOVER;
srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
} else if (cmd->data_direction == DMA_FROM_DEVICE) {
/* residual data from an overflow read */
srp_rsp->flags = SRP_RSP_FLAG_DIOVER;
srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
}
}
if (sense_data_len) {
BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);