linux/drivers/scsi/cxgb3i/cxgb3i_pdu.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

496 lines
12 KiB
C

/*
* cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
*
* Copyright (c) 2008 Chelsio Communications, Inc.
* Copyright (c) 2008 Mike Christie
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*
* Written by: Karen Xie (kxie@chelsio.com)
*/
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/crypto.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include "cxgb3i.h"
#include "cxgb3i_pdu.h"
#ifdef __DEBUG_CXGB3I_RX__
#define cxgb3i_rx_debug cxgb3i_log_debug
#else
#define cxgb3i_rx_debug(fmt...)
#endif
#ifdef __DEBUG_CXGB3I_TX__
#define cxgb3i_tx_debug cxgb3i_log_debug
#else
#define cxgb3i_tx_debug(fmt...)
#endif
/* always allocate rooms for AHS */
#define SKB_TX_PDU_HEADER_LEN \
(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
static unsigned int skb_extra_headroom;
static struct page *pad_page;
/*
* pdu receive, interact with libiscsi_tcp
*/
static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
unsigned int offset, int offloaded)
{
int status = 0;
int bytes_read;
bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
switch (status) {
case ISCSI_TCP_CONN_ERR:
return -EIO;
case ISCSI_TCP_SUSPENDED:
/* no transfer - just have caller flush queue */
return bytes_read;
case ISCSI_TCP_SKB_DONE:
/*
* pdus should always fit in the skb and we should get
* segment done notifcation.
*/
iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
return -EFAULT;
case ISCSI_TCP_SEGMENT_DONE:
return bytes_read;
default:
iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
"status %d\n", status);
return -EINVAL;
}
}
static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
struct sk_buff *skb)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
bool offloaded = 0;
unsigned int offset;
int rc;
cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
conn, skb, skb->len, skb_ulp_mode(skb));
if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
return -EIO;
}
if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
return -EIO;
}
if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
return -EIO;
}
/* iscsi hdr */
rc = read_pdu_skb(conn, skb, 0, 0);
if (rc <= 0)
return rc;
if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
return 0;
offset = rc;
if (conn->hdrdgst_en)
offset += ISCSI_DIGEST_SIZE;
/* iscsi data */
if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
"itt 0x%x.\n",
skb,
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
tcp_conn->in.datalen,
ntohl(tcp_conn->in.hdr->itt));
offloaded = 1;
} else {
cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
"itt 0x%x.\n",
skb,
tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
tcp_conn->in.datalen,
ntohl(tcp_conn->in.hdr->itt));
offset += sizeof(struct cpl_iscsi_hdr_norss);
}
rc = read_pdu_skb(conn, skb, offset, offloaded);
if (rc < 0)
return rc;
else
return 0;
}
/*
* pdu transmit, interact with libiscsi_tcp
*/
static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
{
u8 submode = 0;
if (hcrc)
submode |= 1;
if (dcrc)
submode |= 2;
skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
}
void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
{
struct cxgb3i_task_data *tdata = task->dd_data +
sizeof(struct iscsi_tcp_task);
/* never reached the xmit task callout */
if (tdata->skb)
__kfree_skb(tdata->skb);
memset(tdata, 0, sizeof(struct cxgb3i_task_data));
/* MNC - Do we need a check in case this is called but
* cxgb3i_conn_alloc_pdu has never been called on the task */
cxgb3i_release_itt(task, task->hdr_itt);
iscsi_tcp_cleanup_task(task);
}
static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
unsigned int offset, unsigned int *off,
struct scatterlist **sgp)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, sgcnt, i) {
if (offset < sg->length) {
*off = offset;
*sgp = sg;
return 0;
}
offset -= sg->length;
}
return -EFAULT;
}
static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
unsigned int dlen, skb_frag_t *frags,
int frag_max)
{
unsigned int datalen = dlen;
unsigned int sglen = sg->length - sgoffset;
struct page *page = sg_page(sg);
int i;
i = 0;
do {
unsigned int copy;
if (!sglen) {
sg = sg_next(sg);
if (!sg) {
cxgb3i_log_error("%s, sg NULL, len %u/%u.\n",
__func__, datalen, dlen);
return -EINVAL;
}
sgoffset = 0;
sglen = sg->length;
page = sg_page(sg);
}
copy = min(datalen, sglen);
if (i && page == frags[i - 1].page &&
sgoffset + sg->offset ==
frags[i - 1].page_offset + frags[i - 1].size) {
frags[i - 1].size += copy;
} else {
if (i >= frag_max) {
cxgb3i_log_error("%s, too many pages %u, "
"dlen %u.\n", __func__,
frag_max, dlen);
return -EINVAL;
}
frags[i].page = page;
frags[i].page_offset = sg->offset + sgoffset;
frags[i].size = copy;
i++;
}
datalen -= copy;
sgoffset += copy;
sglen -= copy;
} while (datalen);
return i;
}
int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task);
struct scsi_cmnd *sc = task->sc;
int headroom = SKB_TX_PDU_HEADER_LEN;
tcp_task->dd_data = tdata;
task->hdr = NULL;
/* write command, need to send data pdus */
if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT ||
(opcode == ISCSI_OP_SCSI_CMD &&
(scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
headroom += min(skb_extra_headroom, conn->max_xmit_dlength);
tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC);
if (!tdata->skb)
return -ENOMEM;
skb_reserve(tdata->skb, TX_HEADER_LEN);
cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
task, opcode, tdata->skb);
task->hdr = (struct iscsi_hdr *)tdata->skb->data;
task->hdr_max = SKB_TX_PDU_HEADER_LEN;
/* data_out uses scsi_cmd's itt */
if (opcode != ISCSI_OP_SCSI_DATA_OUT)
cxgb3i_reserve_itt(task, &task->hdr->itt);
return 0;
}
int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
unsigned int count)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = tcp_task->dd_data;
struct sk_buff *skb = tdata->skb;
unsigned int datalen = count;
int i, padlen = iscsi_padding(count);
struct page *pg;
cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
task, task->sc, offset, count, skb);
skb_put(skb, task->hdr_len);
tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
if (!count)
return 0;
if (task->sc) {
struct scsi_data_buffer *sdb = scsi_out(task->sc);
struct scatterlist *sg = NULL;
int err;
tdata->offset = offset;
tdata->count = count;
err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents,
tdata->offset, &tdata->sgoffset, &sg);
if (err < 0) {
cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n",
sdb->table.nents, tdata->offset,
sdb->length);
return err;
}
err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
tdata->frags, MAX_PDU_FRAGS);
if (err < 0) {
cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n",
sdb->table.nents, tdata->offset,
tdata->count);
return err;
}
tdata->nr_frags = err;
if (tdata->nr_frags > MAX_SKB_FRAGS ||
(padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
char *dst = skb->data + task->hdr_len;
skb_frag_t *frag = tdata->frags;
/* data fits in the skb's headroom */
for (i = 0; i < tdata->nr_frags; i++, frag++) {
char *src = kmap_atomic(frag->page,
KM_SOFTIRQ0);
memcpy(dst, src+frag->page_offset, frag->size);
dst += frag->size;
kunmap_atomic(src, KM_SOFTIRQ0);
}
if (padlen) {
memset(dst, 0, padlen);
padlen = 0;
}
skb_put(skb, count + padlen);
} else {
/* data fit into frag_list */
for (i = 0; i < tdata->nr_frags; i++)
get_page(tdata->frags[i].page);
memcpy(skb_shinfo(skb)->frags, tdata->frags,
sizeof(skb_frag_t) * tdata->nr_frags);
skb_shinfo(skb)->nr_frags = tdata->nr_frags;
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
} else {
pg = virt_to_page(task->data);
get_page(pg);
skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
count);
skb->len += count;
skb->data_len += count;
skb->truesize += count;
}
if (padlen) {
i = skb_shinfo(skb)->nr_frags;
get_page(pad_page);
skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0,
padlen);
skb->data_len += padlen;
skb->truesize += padlen;
skb->len += padlen;
}
return 0;
}
int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
{
struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = tcp_task->dd_data;
struct sk_buff *skb = tdata->skb;
unsigned int datalen;
int err;
if (!skb)
return 0;
datalen = skb->data_len;
tdata->skb = NULL;
err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
if (err > 0) {
int pdulen = err;
cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
task, skb, skb->len, skb->data_len, err);
if (task->conn->hdrdgst_en)
pdulen += ISCSI_DIGEST_SIZE;
if (datalen && task->conn->datadgst_en)
pdulen += ISCSI_DIGEST_SIZE;
task->conn->txdata_octets += pdulen;
return 0;
}
if (err == -EAGAIN || err == -ENOBUFS) {
/* reset skb to send when we are called again */
tdata->skb = skb;
return err;
}
kfree_skb(skb);
cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
task->itt, skb, skb->len, skb->data_len, err);
iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
return err;
}
int cxgb3i_pdu_init(void)
{
if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS))
skb_extra_headroom = SKB_TX_HEADROOM;
pad_page = alloc_page(GFP_KERNEL);
if (!pad_page)
return -ENOMEM;
memset(page_address(pad_page), 0, PAGE_SIZE);
return 0;
}
void cxgb3i_pdu_cleanup(void)
{
if (pad_page) {
__free_page(pad_page);
pad_page = NULL;
}
}
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
{
struct sk_buff *skb;
unsigned int read = 0;
struct iscsi_conn *conn = c3cn->user_data;
int err = 0;
cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
read_lock(&c3cn->callback_lock);
if (unlikely(!conn || conn->suspend_rx)) {
cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
conn, conn ? conn->id : 0xFF,
conn ? conn->suspend_rx : 0xFF);
read_unlock(&c3cn->callback_lock);
return;
}
skb = skb_peek(&c3cn->receive_queue);
while (!err && skb) {
__skb_unlink(skb, &c3cn->receive_queue);
read += skb_rx_pdulen(skb);
cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n",
conn, c3cn, skb, skb_rx_pdulen(skb));
err = cxgb3i_conn_read_pdu_skb(conn, skb);
__kfree_skb(skb);
skb = skb_peek(&c3cn->receive_queue);
}
read_unlock(&c3cn->callback_lock);
c3cn->copied_seq += read;
cxgb3i_c3cn_rx_credits(c3cn, read);
conn->rxdata_octets += read;
if (err) {
cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
}
}
void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
{
struct iscsi_conn *conn = c3cn->user_data;
cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
if (conn) {
cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
iscsi_conn_queue_work(conn);
}
}
void cxgb3i_conn_closing(struct s3_conn *c3cn)
{
struct iscsi_conn *conn;
read_lock(&c3cn->callback_lock);
conn = c3cn->user_data;
if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
read_unlock(&c3cn->callback_lock);
}