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[SCSI] cxgb3i: Outgoing pdus need to observe skb's MAX_SKB_FRAGS 

Need to make sure the outgoing pdu can fit into a single skb.  When
calulating the max. outgoing pdu payload size, take into consideration
of
- data can be held in the skb's fragment list, assume 512 bytes per
  fragment, and
- data can be held in the headroom.

Signed-off-by: Karen Xie <kxie@chelsio.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Karen Xie 2009-02-13 21:38:54 -08:00 committed by James Bottomley
parent 949847d195
commit f62d0896e6
6 changed files with 202 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/scsi/cxgb3i/cxgb3i_ddp.c
View File

@ -639,10 +639,11 @@ static int ddp_init(struct t3cdev *tdev)
write_unlock(&cxgb3i_ddp_rwlock);
ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
"pkt %u,%u.\n",
"pkt %u/%u, %u/%u.\n",
ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
ddp->idx_mask, ddp->rsvd_tag_mask,
ddp->max_txsz, ddp->max_rxsz);
ddp->max_txsz, uinfo.max_txsz,
ddp->max_rxsz, uinfo.max_rxsz);
return 0;
free_ddp_map:
@ -654,8 +655,8 @@ free_ddp_map:
* cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
* @tdev: t3cdev adapter
* @tformat: tag format
* @txsz: max tx pkt size, filled in by this func.
* @rxsz: max rx pkt size, filled in by this func.
* @txsz: max tx pdu payload size, filled in by this func.
* @rxsz: max rx pdu payload size, filled in by this func.
* initialize the ddp pagepod manager for a given adapter if needed and
* setup the tag format for a given iscsi entity
*/
@ -685,10 +686,12 @@ int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
tformat->sw_bits, tformat->rsvd_bits,
tformat->rsvd_shift, tformat->rsvd_mask);
*txsz = ddp->max_txsz;
*rxsz = ddp->max_rxsz;
ddp_log_info("ddp max pkt size: %u, %u.\n",
ddp->max_txsz, ddp->max_rxsz);
*txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
*rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
ddp_log_info("max payload size: %u/%u, %u/%u.\n",
*txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
return 0;
}
EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);

3
drivers/scsi/cxgb3i/cxgb3i_ddp.h
View File

@ -85,8 +85,9 @@ struct cxgb3i_ddp_info {
struct sk_buff **gl_skb;
};
#define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8) */
#define ULP2_MAX_PKT_SIZE 16224
#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_MAX)
#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
#define PPOD_PAGES_MAX 4
#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */

17
drivers/scsi/cxgb3i/cxgb3i_iscsi.c
View File

@ -403,17 +403,15 @@ static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
cconn->hba->snic->tx_max_size -
ISCSI_PDU_NONPAYLOAD_MAX);
unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
max = min(cconn->hba->snic->tx_max_size, max);
if (conn->max_xmit_dlength)
conn->max_xmit_dlength = min_t(unsigned int,
conn->max_xmit_dlength, max);
conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
else
conn->max_xmit_dlength = max;
align_pdu_size(conn->max_xmit_dlength);
cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
conn, conn->max_xmit_dlength);
return 0;
}
@ -428,9 +426,7 @@ static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
struct cxgb3i_conn *cconn = tcp_conn->dd_data;
unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
cconn->hba->snic->rx_max_size -
ISCSI_PDU_NONPAYLOAD_MAX);
unsigned int max = cconn->hba->snic->rx_max_size;
align_pdu_size(max);
if (conn->max_recv_dlength) {
@ -440,8 +436,7 @@ static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
conn->max_recv_dlength, max);
return -EINVAL;
}
conn->max_recv_dlength = min_t(unsigned int,
conn->max_recv_dlength, max);
conn->max_recv_dlength = min(conn->max_recv_dlength, max);
align_pdu_size(conn->max_recv_dlength);
} else
conn->max_recv_dlength = max;

1
drivers/scsi/cxgb3i/cxgb3i_offload.h
View File

@ -225,6 +225,7 @@ struct sge_opaque_hdr {
/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
#define TX_HEADER_LEN \
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
#define SKB_TX_HEADROOM SKB_MAX_HEAD(TX_HEADER_LEN)
/*
* get and set private ip for iscsi traffic

269
drivers/scsi/cxgb3i/cxgb3i_pdu.c
View File

@ -32,6 +32,10 @@
#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;
/*
@ -146,12 +150,13 @@ static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
{
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct cxgb3i_task_data *tdata = task->dd_data +
sizeof(struct iscsi_tcp_task);
/* never reached the xmit task callout */
if (tcp_task->dd_data)
kfree_skb(tcp_task->dd_data);
tcp_task->dd_data = NULL;
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 */
@ -159,28 +164,102 @@ void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
iscsi_tcp_cleanup_task(task);
}
/*
* We do not support ahs yet
*/
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 sk_buff *skb;
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;
/* always allocate rooms for AHS */
skb = alloc_skb(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE +
TX_HEADER_LEN, GFP_ATOMIC);
if (!skb)
/* 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, skb);
task, opcode, tdata->skb);
tcp_task->dd_data = skb;
skb_reserve(skb, TX_HEADER_LEN);
task->hdr = (struct iscsi_hdr *)skb->data;
task->hdr_max = sizeof(struct iscsi_hdr);
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)
@ -192,13 +271,13 @@ int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
unsigned int count)
{
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct sk_buff *skb = tcp_task->dd_data;
struct iscsi_conn *conn = task->conn;
struct page *pg;
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);
skb_frag_t *frag;
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);
@ -209,90 +288,94 @@ int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
return 0;
if (task->sc) {
struct scatterlist *sg;
struct scsi_data_buffer *sdb;
unsigned int sgoffset = offset;
struct page *sgpg;
unsigned int sglen;
struct scsi_data_buffer *sdb = scsi_out(task->sc);
struct scatterlist *sg = NULL;
int err;
sdb = scsi_out(task->sc);
sg = sdb->table.sgl;
for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
cxgb3i_tx_debug("sg %d, page 0x%p, len %u offset %u\n",
i, sg_page(sg), sg->length, sg->offset);
if (sgoffset < sg->length)
break;
sgoffset -= sg->length;
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;
}
sgpg = sg_page(sg);
sglen = sg->length - sgoffset;
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;
do {
int j = skb_shinfo(skb)->nr_frags;
unsigned int copy;
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;
if (!sglen) {
sg = sg_next(sg);
sgpg = sg_page(sg);
sgoffset = 0;
sglen = sg->length;
++i;
/* 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);
}
copy = min(sglen, datalen);
if (j && skb_can_coalesce(skb, j, sgpg,
sg->offset + sgoffset)) {
skb_shinfo(skb)->frags[j - 1].size += copy;
} else {
get_page(sgpg);
skb_fill_page_desc(skb, j, sgpg,
sg->offset + sgoffset, copy);
if (padlen) {
memset(dst, 0, padlen);
padlen = 0;
}
sgoffset += copy;
sglen -= copy;
datalen -= copy;
} while (datalen);
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);
while (datalen) {
i = skb_shinfo(skb)->nr_frags;
frag = &skb_shinfo(skb)->frags[i];
get_page(pg);
frag->page = pg;
frag->page_offset = 0;
frag->size = min((unsigned int)PAGE_SIZE, datalen);
skb_shinfo(skb)->nr_frags++;
datalen -= frag->size;
pg++;
}
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;
frag = &skb_shinfo(skb)->frags[i];
frag->page = pad_page;
frag->page_offset = 0;
frag->size = padlen;
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;
}
datalen = count + padlen;
skb->data_len += datalen;
skb->truesize += datalen;
skb->len += datalen;
return 0;
}
int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
{
struct iscsi_tcp_task *tcp_task = task->dd_data;
struct sk_buff *skb = tcp_task->dd_data;
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;
@ -300,13 +383,14 @@ int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
return 0;
datalen = skb->data_len;
tcp_task->dd_data = NULL;
tdata->skb = NULL;
err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
task, skb, skb->len, skb->data_len, err);
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)
@ -325,12 +409,14 @@ int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
return err;
}
/* reset skb to send when we are called again */
tcp_task->dd_data = skb;
tdata->skb = skb;
return -EAGAIN;
}
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;
@ -366,7 +452,9 @@ void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
skb = skb_peek(&c3cn->receive_queue);
while (!err && skb) {
__skb_unlink(skb, &c3cn->receive_queue);
read += skb_ulp_pdulen(skb);
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);
@ -377,6 +465,11 @@ void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
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)

2
drivers/scsi/cxgb3i/cxgb3i_pdu.h
View File

@ -53,7 +53,7 @@ struct cpl_rx_data_ddp_norss {
#define ULP2_FLAG_DCRC_ERROR 0x20
#define ULP2_FLAG_PAD_ERROR 0x40
void cxgb3i_conn_closing(struct s3_conn *);
void cxgb3i_conn_closing(struct s3_conn *c3cn);
void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
#endif