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srpt: Make zero-copy mode compatible with the scst_user device handler

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The scst_user device handler allocates its own data buffers. If ib_srpt
uses zero-copy mode, copy data as required between the device handler and
zero-copy buffer.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8914 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2020-05-14 16:40:05 +00:00
parent 198cb64c8d
commit d045ff5e26
1 changed files with 9 additions and 0 deletions
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9
srpt/src/ib_srpt.c
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@@ -1230,6 +1230,7 @@ static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx,
pr_warn_once("Internal error - the receive buffers are not aligned properly.\n");
return -EINVAL;
}
/* Note: this sg entry may span more than one physical page. */
sg_init_one(&ioctx->imm_sg, data, len);
scst_cmd_set_tgt_sg(&ioctx->cmd, &ioctx->imm_sg, 1);
return 0;
@@ -3615,6 +3616,10 @@ static int srpt_xfer_data(struct srpt_rdma_ch *ch,
SRPT_STATE_DATA_IN);
BUG_ON(!res);
WARN_ON_ONCE(!scst_cmd_get_tgt_data_buff_alloced(cmd));
if (cmd->tgt_i_data_buf_alloced && cmd->dh_data_buf_alloced &&
scst_cmd_get_data_direction(cmd) & SCST_DATA_WRITE) {
scst_copy_sg(cmd, SCST_SG_COPY_FROM_TARGET);
}
scst_rx_data(cmd, SCST_RX_STATUS_SUCCESS,
in_irq() ? SCST_CONTEXT_TASKLET :
in_softirq() ? SCST_CONTEXT_DIRECT_ATOMIC :
@@ -3760,6 +3765,10 @@ static int srpt_xmit_response(struct scst_cmd *cmd)
dir = scst_cmd_get_data_direction(cmd);
if (cmd->tgt_i_data_buf_alloced && cmd->dh_data_buf_alloced &&
dir & SCST_DATA_READ)
scst_copy_sg(cmd, SCST_SG_COPY_TO_TARGET);
/* For read commands, transfer the data to the initiator. */
if (dir == SCST_DATA_READ
&& scst_cmd_get_adjusted_resp_data_len(cmd)) {