IB/isert: pass scatterlist instead of cmd to fast_reg_mr routine

This routine may help for protection registration as well.
This patch does not change any functionality.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 9ef9193..421182b 100644 (file)
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -2169,26 +2169,22 @@ isert_map_fr_pagelist(struct ib_device *ib_dev,
 
 static int
 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
-                 struct isert_cmd *isert_cmd, struct isert_conn *isert_conn,
-                 struct ib_sge *ib_sge, u32 offset, unsigned int data_len)
+                 struct isert_conn *isert_conn, struct scatterlist *sg_start,
+                 struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
+                 unsigned int data_len)
 {
-       struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
        struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
-       struct scatterlist *sg_start;
-       u32 sg_off, page_off;
        struct ib_send_wr fr_wr, inv_wr;
        struct ib_send_wr *bad_wr, *wr = NULL;
+       int ret, pagelist_len;
+       u32 page_off;
        u8 key;
-       int ret, sg_nents, pagelist_len;
 
-       sg_off = offset / PAGE_SIZE;
-       sg_start = &cmd->se_cmd.t_data_sg[sg_off];
-       sg_nents = min_t(unsigned int, cmd->se_cmd.t_data_nents - sg_off,
-                        ISCSI_ISER_SG_TABLESIZE);
+       sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
        page_off = offset % PAGE_SIZE;
 
-       pr_debug("Cmd: %p use fr_desc %p sg_nents %d sg_off %d offset %u\n",
-                isert_cmd, fr_desc, sg_nents, sg_off, offset);
+       pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
+                fr_desc, sg_nents, offset);
 
        pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
                                             &fr_desc->data_frpl->page_list[0]);
@@ -2257,9 +2253,9 @@ isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
        if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
                data_left = se_cmd->data_length;
        } else {
-               sg_off = cmd->write_data_done / PAGE_SIZE;
-               data_left = se_cmd->data_length - cmd->write_data_done;
                offset = cmd->write_data_done;
+               sg_off = offset / PAGE_SIZE;
+               data_left = se_cmd->data_length - cmd->write_data_done;
                isert_cmd->tx_desc.isert_cmd = isert_cmd;
        }
 
@@ -2323,8 +2319,8 @@ isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
                spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
                wr->fr_desc = fr_desc;
 
-               ret = isert_fast_reg_mr(fr_desc, isert_cmd, isert_conn,
-                                 ib_sge, offset, data_len);
+               ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
+                                       ib_sge, sg_nents, offset, data_len);
                if (ret) {
                        list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
                        goto unmap_sg;