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path: root/drivers/target/tcm_fc/tfc_io.c
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Diffstat (limited to 'drivers/target/tcm_fc/tfc_io.c')
-rw-r--r--drivers/target/tcm_fc/tfc_io.c130
1 files changed, 45 insertions, 85 deletions
diff --git a/drivers/target/tcm_fc/tfc_io.c b/drivers/target/tcm_fc/tfc_io.c
index 834a74ee5575..8e2a46ddcccb 100644
--- a/drivers/target/tcm_fc/tfc_io.c
+++ b/drivers/target/tcm_fc/tfc_io.c
@@ -39,6 +39,7 @@
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <linux/hash.h>
+#include <linux/ratelimit.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
@@ -64,21 +65,20 @@
int ft_queue_data_in(struct se_cmd *se_cmd)
{
struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
- struct se_transport_task *task;
struct fc_frame *fp = NULL;
struct fc_exch *ep;
struct fc_lport *lport;
- struct se_mem *mem;
+ struct scatterlist *sg = NULL;
size_t remaining;
u32 f_ctl = FC_FC_EX_CTX | FC_FC_REL_OFF;
- u32 mem_off;
+ u32 mem_off = 0;
u32 fh_off = 0;
u32 frame_off = 0;
size_t frame_len = 0;
- size_t mem_len;
+ size_t mem_len = 0;
size_t tlen;
size_t off_in_page;
- struct page *page;
+ struct page *page = NULL;
int use_sg;
int error;
void *page_addr;
@@ -89,24 +89,17 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
lport = ep->lp;
cmd->seq = lport->tt.seq_start_next(cmd->seq);
- task = T_TASK(se_cmd);
- BUG_ON(!task);
remaining = se_cmd->data_length;
/*
- * Setup to use first mem list entry if any.
+ * Setup to use first mem list entry, unless no data.
*/
- if (task->t_tasks_se_num) {
- mem = list_first_entry(task->t_mem_list,
- struct se_mem, se_list);
- mem_len = mem->se_len;
- mem_off = mem->se_off;
- page = mem->se_page;
- } else {
- mem = NULL;
- mem_len = remaining;
- mem_off = 0;
- page = NULL;
+ BUG_ON(remaining && !se_cmd->t_data_sg);
+ if (remaining) {
+ sg = se_cmd->t_data_sg;
+ mem_len = sg->length;
+ mem_off = sg->offset;
+ page = sg_page(sg);
}
/* no scatter/gather in skb for odd word length due to fc_seq_send() */
@@ -114,12 +107,10 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
while (remaining) {
if (!mem_len) {
- BUG_ON(!mem);
- mem = list_entry(mem->se_list.next,
- struct se_mem, se_list);
- mem_len = min((size_t)mem->se_len, remaining);
- mem_off = mem->se_off;
- page = mem->se_page;
+ sg = sg_next(sg);
+ mem_len = min((size_t)sg->length, remaining);
+ mem_off = sg->offset;
+ page = sg_page(sg);
}
if (!frame_len) {
/*
@@ -147,18 +138,7 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
tlen = min(mem_len, frame_len);
if (use_sg) {
- if (!mem) {
- BUG_ON(!task->t_task_buf);
- page_addr = task->t_task_buf + mem_off;
- /*
- * In this case, offset is 'offset_in_page' of
- * (t_task_buf + mem_off) instead of 'mem_off'.
- */
- off_in_page = offset_in_page(page_addr);
- page = virt_to_page(page_addr);
- tlen = min(tlen, PAGE_SIZE - off_in_page);
- } else
- off_in_page = mem_off;
+ off_in_page = mem_off;
BUG_ON(!page);
get_page(page);
skb_fill_page_desc(fp_skb(fp),
@@ -168,7 +148,7 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
fp_skb(fp)->data_len += tlen;
fp_skb(fp)->truesize +=
PAGE_SIZE << compound_order(page);
- } else if (mem) {
+ } else {
BUG_ON(!page);
from = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
KM_SOFTIRQ0);
@@ -179,10 +159,6 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
memcpy(to, from, tlen);
kunmap_atomic(page_addr, KM_SOFTIRQ0);
to += tlen;
- } else {
- from = task->t_task_buf + mem_off;
- memcpy(to, from, tlen);
- to += tlen;
}
mem_off += tlen;
@@ -200,8 +176,7 @@ int ft_queue_data_in(struct se_cmd *se_cmd)
error = lport->tt.seq_send(lport, cmd->seq, fp);
if (error) {
/* XXX For now, initiator will retry */
- if (printk_ratelimit())
- printk(KERN_ERR "%s: Failed to send frame %p, "
+ pr_err_ratelimited("%s: Failed to send frame %p, "
"xid <0x%x>, remaining %zu, "
"lso_max <0x%x>\n",
__func__, fp, ep->xid,
@@ -220,24 +195,20 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
struct fc_seq *seq = cmd->seq;
struct fc_exch *ep;
struct fc_lport *lport;
- struct se_transport_task *task;
struct fc_frame_header *fh;
- struct se_mem *mem;
- u32 mem_off;
+ struct scatterlist *sg = NULL;
+ u32 mem_off = 0;
u32 rel_off;
size_t frame_len;
- size_t mem_len;
+ size_t mem_len = 0;
size_t tlen;
- struct page *page;
+ struct page *page = NULL;
void *page_addr;
void *from;
void *to;
u32 f_ctl;
void *buf;
- task = T_TASK(se_cmd);
- BUG_ON(!task);
-
fh = fc_frame_header_get(fp);
if (!(ntoh24(fh->fh_f_ctl) & FC_FC_REL_OFF))
goto drop;
@@ -250,7 +221,7 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
*/
buf = fc_frame_payload_get(fp, 1);
if (cmd->was_ddp_setup && buf) {
- printk(KERN_INFO "%s: When DDP was setup, not expected to"
+ pr_debug("%s: When DDP was setup, not expected to"
"receive frame with payload, Payload shall be"
"copied directly to buffer instead of coming "
"via. legacy receive queues\n", __func__);
@@ -288,7 +259,7 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
* this point, but just in case if required in future
* for debugging or any other purpose
*/
- printk(KERN_ERR "%s: Received frame with TSI bit not"
+ pr_err("%s: Received frame with TSI bit not"
" being SET, dropping the frame, "
"cmd->sg <%p>, cmd->sg_cnt <0x%x>\n",
__func__, cmd->sg, cmd->sg_cnt);
@@ -311,29 +282,22 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
frame_len = se_cmd->data_length - rel_off;
/*
- * Setup to use first mem list entry if any.
+ * Setup to use first mem list entry, unless no data.
*/
- if (task->t_tasks_se_num) {
- mem = list_first_entry(task->t_mem_list,
- struct se_mem, se_list);
- mem_len = mem->se_len;
- mem_off = mem->se_off;
- page = mem->se_page;
- } else {
- mem = NULL;
- page = NULL;
- mem_off = 0;
- mem_len = frame_len;
+ BUG_ON(frame_len && !se_cmd->t_data_sg);
+ if (frame_len) {
+ sg = se_cmd->t_data_sg;
+ mem_len = sg->length;
+ mem_off = sg->offset;
+ page = sg_page(sg);
}
while (frame_len) {
if (!mem_len) {
- BUG_ON(!mem);
- mem = list_entry(mem->se_list.next,
- struct se_mem, se_list);
- mem_len = mem->se_len;
- mem_off = mem->se_off;
- page = mem->se_page;
+ sg = sg_next(sg);
+ mem_len = sg->length;
+ mem_off = sg->offset;
+ page = sg_page(sg);
}
if (rel_off >= mem_len) {
rel_off -= mem_len;
@@ -346,19 +310,15 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
tlen = min(mem_len, frame_len);
- if (mem) {
- to = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
- KM_SOFTIRQ0);
- page_addr = to;
- to += mem_off & ~PAGE_MASK;
- tlen = min(tlen, (size_t)(PAGE_SIZE -
- (mem_off & ~PAGE_MASK)));
- memcpy(to, from, tlen);
- kunmap_atomic(page_addr, KM_SOFTIRQ0);
- } else {
- to = task->t_task_buf + mem_off;
- memcpy(to, from, tlen);
- }
+ to = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
+ KM_SOFTIRQ0);
+ page_addr = to;
+ to += mem_off & ~PAGE_MASK;
+ tlen = min(tlen, (size_t)(PAGE_SIZE -
+ (mem_off & ~PAGE_MASK)));
+ memcpy(to, from, tlen);
+ kunmap_atomic(page_addr, KM_SOFTIRQ0);
+
from += tlen;
frame_len -= tlen;
mem_off += tlen;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.