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-rw-r--r--drivers/scsi/fcoe/fcoe.c217
-rw-r--r--drivers/scsi/fcoe/fcoe.h44
-rw-r--r--drivers/scsi/fcoe/fcoe_transport.c200
3 files changed, 224 insertions, 237 deletions
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 46c57e5..495456f 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -75,7 +75,6 @@ static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
static int fcoe_rcv(struct sk_buff *, struct net_device *,
struct packet_type *, struct net_device *);
static int fcoe_percpu_receive_thread(void *);
-static void fcoe_clean_pending_queue(struct fc_lport *);
static void fcoe_percpu_clean(struct fc_lport *);
static int fcoe_link_speed_update(struct fc_lport *);
static int fcoe_link_ok(struct fc_lport *);
@@ -83,7 +82,6 @@ static int fcoe_link_ok(struct fc_lport *);
static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
static int fcoe_hostlist_add(const struct fc_lport *);
-static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
static int fcoe_device_notification(struct notifier_block *, ulong, void *);
static void fcoe_dev_setup(void);
static void fcoe_dev_cleanup(void);
@@ -506,7 +504,7 @@ static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
{
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
rtnl_lock();
if (!is_zero_ether_addr(port->data_src_addr))
@@ -562,17 +560,6 @@ static int fcoe_lport_config(struct fc_lport *lport)
}
/**
- * fcoe_queue_timer() - The fcoe queue timer
- * @lport: The local port
- *
- * Calls fcoe_check_wait_queue on timeout
- */
-static void fcoe_queue_timer(ulong lport)
-{
- fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
-}
-
-/**
* fcoe_get_wwn() - Get the world wide name from LLD if it supports it
* @netdev: the associated net device
* @wwn: the output WWN
@@ -651,7 +638,7 @@ static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
/* Setup lport private data to point to fcoe softc */
port = lport_priv(lport);
- fcoe = port->fcoe;
+ fcoe = port->priv;
/*
* Determine max frame size based on underlying device and optional
@@ -761,7 +748,7 @@ bool fcoe_oem_match(struct fc_frame *fp)
static inline int fcoe_em_config(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
struct fcoe_interface *oldfcoe = NULL;
struct net_device *old_real_dev, *cur_real_dev;
u16 min_xid = FCOE_MIN_XID;
@@ -845,7 +832,7 @@ skip_oem:
static void fcoe_if_destroy(struct fc_lport *lport)
{
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
struct net_device *netdev = fcoe->netdev;
FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
@@ -966,7 +953,9 @@ static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
}
port = lport_priv(lport);
port->lport = lport;
- port->fcoe = fcoe;
+ port->priv = fcoe;
+ port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
+ port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
INIT_WORK(&port->destroy_work, fcoe_destroy_work);
/* configure a fc_lport including the exchange manager */
@@ -1362,108 +1351,22 @@ err2:
}
/**
- * fcoe_start_io() - Start FCoE I/O
- * @skb: The packet to be transmitted
- *
- * This routine is called from the net device to start transmitting
- * FCoE packets.
- *
- * Returns: 0 for success
- */
-static inline int fcoe_start_io(struct sk_buff *skb)
-{
- struct sk_buff *nskb;
- int rc;
-
- nskb = skb_clone(skb, GFP_ATOMIC);
- rc = dev_queue_xmit(nskb);
- if (rc != 0)
- return rc;
- kfree_skb(skb);
- return 0;
-}
-
-/**
- * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
+ * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
* @skb: The packet to be transmitted
* @tlen: The total length of the trailer
*
- * This routine allocates a page for frame trailers. The page is re-used if
- * there is enough room left on it for the current trailer. If there isn't
- * enough buffer left a new page is allocated for the trailer. Reference to
- * the page from this function as well as the skbs using the page fragments
- * ensure that the page is freed at the appropriate time.
- *
* Returns: 0 for success
*/
-static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
+static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
{
struct fcoe_percpu_s *fps;
- struct page *page;
+ int rc;
fps = &get_cpu_var(fcoe_percpu);
- page = fps->crc_eof_page;
- if (!page) {
- page = alloc_page(GFP_ATOMIC);
- if (!page) {
- put_cpu_var(fcoe_percpu);
- return -ENOMEM;
- }
- fps->crc_eof_page = page;
- fps->crc_eof_offset = 0;
- }
-
- get_page(page);
- skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
- fps->crc_eof_offset, tlen);
- skb->len += tlen;
- skb->data_len += tlen;
- skb->truesize += tlen;
- fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
-
- if (fps->crc_eof_offset >= PAGE_SIZE) {
- fps->crc_eof_page = NULL;
- fps->crc_eof_offset = 0;
- put_page(page);
- }
+ rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
put_cpu_var(fcoe_percpu);
- return 0;
-}
-/**
- * fcoe_fc_crc() - Calculates the CRC for a given frame
- * @fp: The frame to be checksumed
- *
- * This uses crc32() routine to calculate the CRC for a frame
- *
- * Return: The 32 bit CRC value
- */
-u32 fcoe_fc_crc(struct fc_frame *fp)
-{
- struct sk_buff *skb = fp_skb(fp);
- struct skb_frag_struct *frag;
- unsigned char *data;
- unsigned long off, len, clen;
- u32 crc;
- unsigned i;
-
- crc = crc32(~0, skb->data, skb_headlen(skb));
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- frag = &skb_shinfo(skb)->frags[i];
- off = frag->page_offset;
- len = frag->size;
- while (len > 0) {
- clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
- data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
- KM_SKB_DATA_SOFTIRQ);
- crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
- kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
- off += clen;
- len -= clen;
- }
- }
- return crc;
+ return rc;
}
/**
@@ -1486,7 +1389,7 @@ int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
unsigned int tlen; /* trailer length */
unsigned int elen; /* eth header, may include vlan */
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
u8 sof, eof;
struct fcoe_hdr *hp;
@@ -1527,7 +1430,7 @@ int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
/* copy port crc and eof to the skb buff */
if (skb_is_nonlinear(skb)) {
skb_frag_t *frag;
- if (fcoe_get_paged_crc_eof(skb, tlen)) {
+ if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
kfree_skb(skb);
return -ENOMEM;
}
@@ -1636,7 +1539,7 @@ static inline int fcoe_filter_frames(struct fc_lport *lport,
if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
return 0;
- fcoe = ((struct fcoe_port *)lport_priv(lport))->fcoe;
+ fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
if (is_fip_mode(&fcoe->ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
@@ -1771,64 +1674,6 @@ int fcoe_percpu_receive_thread(void *arg)
}
/**
- * fcoe_check_wait_queue() - Attempt to clear the transmit backlog
- * @lport: The local port whose backlog is to be cleared
- *
- * This empties the wait_queue, dequeues the head of the wait_queue queue
- * and calls fcoe_start_io() for each packet. If all skb have been
- * transmitted it returns the qlen. If an error occurs it restores
- * wait_queue (to try again later) and returns -1.
- *
- * The wait_queue is used when the skb transmit fails. The failed skb
- * will go in the wait_queue which will be emptied by the timer function or
- * by the next skb transmit.
- */
-static void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
-{
- struct fcoe_port *port = lport_priv(lport);
- int rc;
-
- spin_lock_bh(&port->fcoe_pending_queue.lock);
-
- if (skb)
- __skb_queue_tail(&port->fcoe_pending_queue, skb);
-
- if (port->fcoe_pending_queue_active)
- goto out;
- port->fcoe_pending_queue_active = 1;
-
- while (port->fcoe_pending_queue.qlen) {
- /* keep qlen > 0 until fcoe_start_io succeeds */
- port->fcoe_pending_queue.qlen++;
- skb = __skb_dequeue(&port->fcoe_pending_queue);
-
- spin_unlock_bh(&port->fcoe_pending_queue.lock);
- rc = fcoe_start_io(skb);
- spin_lock_bh(&port->fcoe_pending_queue.lock);
-
- if (rc) {
- __skb_queue_head(&port->fcoe_pending_queue, skb);
- /* undo temporary increment above */
- port->fcoe_pending_queue.qlen--;
- break;
- }
- /* undo temporary increment above */
- port->fcoe_pending_queue.qlen--;
- }
-
- if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
- lport->qfull = 0;
- if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
- mod_timer(&port->timer, jiffies + 2);
- port->fcoe_pending_queue_active = 0;
-out:
- if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
- lport->qfull = 1;
- spin_unlock_bh(&port->fcoe_pending_queue.lock);
- return;
-}
-
-/**
* fcoe_dev_setup() - Setup the link change notification interface
*/
static void fcoe_dev_setup(void)
@@ -2180,8 +2025,7 @@ out_nodev:
*/
int fcoe_link_speed_update(struct fc_lport *lport)
{
- struct fcoe_port *port = lport_priv(lport);
- struct net_device *netdev = port->fcoe->netdev;
+ struct net_device *netdev = fcoe_netdev(lport);
struct ethtool_cmd ecmd = { ETHTOOL_GSET };
if (!dev_ethtool_get_settings(netdev, &ecmd)) {
@@ -2212,8 +2056,7 @@ int fcoe_link_speed_update(struct fc_lport *lport)
*/
int fcoe_link_ok(struct fc_lport *lport)
{
- struct fcoe_port *port = lport_priv(lport);
- struct net_device *netdev = port->fcoe->netdev;
+ struct net_device *netdev = fcoe_netdev(lport);
if (netif_oper_up(netdev))
return 0;
@@ -2277,24 +2120,6 @@ void fcoe_percpu_clean(struct fc_lport *lport)
}
/**
- * fcoe_clean_pending_queue() - Dequeue a skb and free it
- * @lport: The local port to dequeue a skb on
- */
-void fcoe_clean_pending_queue(struct fc_lport *lport)
-{
- struct fcoe_port *port = lport_priv(lport);
- struct sk_buff *skb;
-
- spin_lock_bh(&port->fcoe_pending_queue.lock);
- while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
- spin_unlock_bh(&port->fcoe_pending_queue.lock);
- kfree_skb(skb);
- spin_lock_bh(&port->fcoe_pending_queue.lock);
- }
- spin_unlock_bh(&port->fcoe_pending_queue.lock);
-}
-
-/**
* fcoe_reset() - Reset a local port
* @shost: The SCSI host associated with the local port to be reset
*
@@ -2361,7 +2186,7 @@ static int fcoe_hostlist_add(const struct fc_lport *lport)
fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
if (!fcoe) {
port = lport_priv(lport);
- fcoe = port->fcoe;
+ fcoe = port->priv;
list_add_tail(&fcoe->list, &fcoe_hostlist);
}
return 0;
@@ -2555,7 +2380,7 @@ static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
void *arg, u32 timeout)
{
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
struct fcoe_ctlr *fip = &fcoe->ctlr;
struct fc_frame_header *fh = fc_frame_header_get(fp);
@@ -2588,7 +2413,7 @@ static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
struct Scsi_Host *shost = vport_to_shost(vport);
struct fc_lport *n_port = shost_priv(shost);
struct fcoe_port *port = lport_priv(n_port);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
struct net_device *netdev = fcoe->netdev;
struct fc_lport *vn_port;
@@ -2732,7 +2557,7 @@ static void fcoe_set_port_id(struct fc_lport *lport,
u32 port_id, struct fc_frame *fp)
{
struct fcoe_port *port = lport_priv(lport);
- struct fcoe_interface *fcoe = port->fcoe;
+ struct fcoe_interface *fcoe = port->priv;
if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp);
diff --git a/drivers/scsi/fcoe/fcoe.h b/drivers/scsi/fcoe/fcoe.h
index c69b2c5..d775128 100644
--- a/drivers/scsi/fcoe/fcoe.h
+++ b/drivers/scsi/fcoe/fcoe.h
@@ -24,7 +24,7 @@
#include <linux/kthread.h>
#define FCOE_MAX_QUEUE_DEPTH 256
-#define FCOE_LOW_QUEUE_DEPTH 32
+#define FCOE_MIN_QUEUE_DEPTH 32
#define FCOE_WORD_TO_BYTE 4
@@ -71,21 +71,6 @@ do { \
netdev->name, ##args);)
/**
- * struct fcoe_percpu_s - The per-CPU context for FCoE receive threads
- * @thread: The thread context
- * @fcoe_rx_list: The queue of pending packets to process
- * @page: The memory page for calculating frame trailer CRCs
- * @crc_eof_offset: The offset into the CRC page pointing to available
- * memory for a new trailer
- */
-struct fcoe_percpu_s {
- struct task_struct *thread;
- struct sk_buff_head fcoe_rx_list;
- struct page *crc_eof_page;
- int crc_eof_offset;
-};
-
-/**
* struct fcoe_interface - A FCoE interface
* @list: Handle for a list of FCoE interfaces
* @netdev: The associated net device
@@ -108,30 +93,6 @@ struct fcoe_interface {
struct kref kref;
};
-/**
- * struct fcoe_port - The FCoE private structure
- * @fcoe: The associated fcoe interface
- * @lport: The associated local port
- * @fcoe_pending_queue: The pending Rx queue of skbs
- * @fcoe_pending_queue_active: Indicates if the pending queue is active
- * @timer: The queue timer
- * @destroy_work: Handle for work context
- * (to prevent RTNL deadlocks)
- * @data_srt_addr: Source address for data
- *
- * An instance of this structure is to be allocated along with the
- * Scsi_Host and libfc fc_lport structures.
- */
-struct fcoe_port {
- struct fcoe_interface *fcoe;
- struct fc_lport *lport;
- struct sk_buff_head fcoe_pending_queue;
- u8 fcoe_pending_queue_active;
- struct timer_list timer;
- struct work_struct destroy_work;
- u8 data_src_addr[ETH_ALEN];
-};
-
#define fcoe_from_ctlr(fip) container_of(fip, struct fcoe_interface, ctlr)
/**
@@ -140,7 +101,8 @@ struct fcoe_port {
*/
static inline struct net_device *fcoe_netdev(const struct fc_lport *lport)
{
- return ((struct fcoe_port *)lport_priv(lport))->fcoe->netdev;
+ return ((struct fcoe_interface *)
+ ((struct fcoe_port *)lport_priv(lport))->priv)->netdev;
}
#endif /* _FCOE_H_ */
diff --git a/drivers/scsi/fcoe/fcoe_transport.c b/drivers/scsi/fcoe/fcoe_transport.c
index e5aef56..745eb9a 100644
--- a/drivers/scsi/fcoe/fcoe_transport.c
+++ b/drivers/scsi/fcoe/fcoe_transport.c
@@ -23,6 +23,7 @@
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/errno.h>
+#include <linux/crc32.h>
#include <scsi/libfcoe.h>
#include "libfcoe.h"
@@ -75,6 +76,205 @@ __MODULE_PARM_TYPE(disable, "string");
MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
/**
+ * fcoe_fc_crc() - Calculates the CRC for a given frame
+ * @fp: The frame to be checksumed
+ *
+ * This uses crc32() routine to calculate the CRC for a frame
+ *
+ * Return: The 32 bit CRC value
+ */
+u32 fcoe_fc_crc(struct fc_frame *fp)
+{
+ struct sk_buff *skb = fp_skb(fp);
+ struct skb_frag_struct *frag;
+ unsigned char *data;
+ unsigned long off, len, clen;
+ u32 crc;
+ unsigned i;
+
+ crc = crc32(~0, skb->data, skb_headlen(skb));
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ frag = &skb_shinfo(skb)->frags[i];
+ off = frag->page_offset;
+ len = frag->size;
+ while (len > 0) {
+ clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
+ data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
+ KM_SKB_DATA_SOFTIRQ);
+ crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
+ kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
+ off += clen;
+ len -= clen;
+ }
+ }
+ return crc;
+}
+EXPORT_SYMBOL_GPL(fcoe_fc_crc);
+
+/**
+ * fcoe_start_io() - Start FCoE I/O
+ * @skb: The packet to be transmitted
+ *
+ * This routine is called from the net device to start transmitting
+ * FCoE packets.
+ *
+ * Returns: 0 for success
+ */
+int fcoe_start_io(struct sk_buff *skb)
+{
+ struct sk_buff *nskb;
+ int rc;
+
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ return -ENOMEM;
+ rc = dev_queue_xmit(nskb);
+ if (rc != 0)
+ return rc;
+ kfree_skb(skb);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_start_io);
+
+
+/**
+ * fcoe_clean_pending_queue() - Dequeue a skb and free it
+ * @lport: The local port to dequeue a skb on
+ */
+void fcoe_clean_pending_queue(struct fc_lport *lport)
+{
+ struct fcoe_port *port = lport_priv(lport);
+ struct sk_buff *skb;
+
+ spin_lock_bh(&port->fcoe_pending_queue.lock);
+ while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
+ spin_unlock_bh(&port->fcoe_pending_queue.lock);
+ kfree_skb(skb);
+ spin_lock_bh(&port->fcoe_pending_queue.lock);
+ }
+ spin_unlock_bh(&port->fcoe_pending_queue.lock);
+}
+EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
+
+/**
+ * fcoe_check_wait_queue() - Attempt to clear the transmit backlog
+ * @lport: The local port whose backlog is to be cleared
+ *
+ * This empties the wait_queue, dequeues the head of the wait_queue queue
+ * and calls fcoe_start_io() for each packet. If all skb have been
+ * transmitted it returns the qlen. If an error occurs it restores
+ * wait_queue (to try again later) and returns -1.
+ *
+ * The wait_queue is used when the skb transmit fails. The failed skb
+ * will go in the wait_queue which will be emptied by the timer function or
+ * by the next skb transmit.
+ */
+void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
+{
+ struct fcoe_port *port = lport_priv(lport);
+ int rc;
+
+ spin_lock_bh(&port->fcoe_pending_queue.lock);
+
+ if (skb)
+ __skb_queue_tail(&port->fcoe_pending_queue, skb);
+
+ if (port->fcoe_pending_queue_active)
+ goto out;
+ port->fcoe_pending_queue_active = 1;
+
+ while (port->fcoe_pending_queue.qlen) {
+ /* keep qlen > 0 until fcoe_start_io succeeds */
+ port->fcoe_pending_queue.qlen++;
+ skb = __skb_dequeue(&port->fcoe_pending_queue);
+
+ spin_unlock_bh(&port->fcoe_pending_queue.lock);
+ rc = fcoe_start_io(skb);
+ spin_lock_bh(&port->fcoe_pending_queue.lock);
+
+ if (rc) {
+ __skb_queue_head(&port->fcoe_pending_queue, skb);
+ /* undo temporary increment above */
+ port->fcoe_pending_queue.qlen--;
+ break;
+ }
+ /* undo temporary increment above */
+ port->fcoe_pending_queue.qlen--;
+ }
+
+ if (port->fcoe_pending_queue.qlen < port->min_queue_depth)
+ lport->qfull = 0;
+ if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
+ mod_timer(&port->timer, jiffies + 2);
+ port->fcoe_pending_queue_active = 0;
+out:
+ if (port->fcoe_pending_queue.qlen > port->max_queue_depth)
+ lport->qfull = 1;
+ spin_unlock_bh(&port->fcoe_pending_queue.lock);
+}
+EXPORT_SYMBOL_GPL(fcoe_check_wait_queue);
+
+/**
+ * fcoe_queue_timer() - The fcoe queue timer
+ * @lport: The local port
+ *
+ * Calls fcoe_check_wait_queue on timeout
+ */
+void fcoe_queue_timer(ulong lport)
+{
+ fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
+}
+EXPORT_SYMBOL_GPL(fcoe_queue_timer);
+
+/**
+ * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
+ * @skb: The packet to be transmitted
+ * @tlen: The total length of the trailer
+ * @fps: The fcoe context
+ *
+ * This routine allocates a page for frame trailers. The page is re-used if
+ * there is enough room left on it for the current trailer. If there isn't
+ * enough buffer left a new page is allocated for the trailer. Reference to
+ * the page from this function as well as the skbs using the page fragments
+ * ensure that the page is freed at the appropriate time.
+ *
+ * Returns: 0 for success
+ */
+int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen,
+ struct fcoe_percpu_s *fps)
+{
+ struct page *page;
+
+ page = fps->crc_eof_page;
+ if (!page) {
+ page = alloc_page(GFP_ATOMIC);
+ if (!page)
+ return -ENOMEM;
+
+ fps->crc_eof_page = page;
+ fps->crc_eof_offset = 0;
+ }
+
+ get_page(page);
+ skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
+ fps->crc_eof_offset, tlen);
+ skb->len += tlen;
+ skb->data_len += tlen;
+ skb->truesize += tlen;
+ fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
+
+ if (fps->crc_eof_offset >= PAGE_SIZE) {
+ fps->crc_eof_page = NULL;
+ fps->crc_eof_offset = 0;
+ put_page(page);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_get_paged_crc_eof);
+
+/**
* fcoe_transport_lookup - find an fcoe transport that matches a netdev
* @netdev: The netdev to look for from all attached transports
*
generated by cgit v0.10.2 at 2024-11-12 00:39:57 (GMT)