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authorKaren Xie <kxie@chelsio.com>2008-12-09 14:15:32 -0800
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-30 10:45:33 -0600
commitc3673464ebc004a3d82063cd41b9cf74d1b55db2 (patch)
treeb061ecd04da7dd3ddddad8f39a4922f437493311 /drivers/scsi/cxgb3i/cxgb3i_offload.h
parent[SCSI] zfcp: Remove unnecessary warning message (diff)
downloadlinux-dev-c3673464ebc004a3d82063cd41b9cf74d1b55db2.tar.xz
linux-dev-c3673464ebc004a3d82063cd41b9cf74d1b55db2.zip
[SCSI] cxgb3i: Add cxgb3i iSCSI driver.
This patch implements the cxgb3i iscsi connection acceleration for the open-iscsi initiator. The cxgb3i driver offers the iscsi PDU based offload: - digest insertion and verification - payload direct-placement into host memory buffer. Signed-off-by: Karen Xie <kxie@chelsio.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to '')
-rw-r--r--drivers/scsi/cxgb3i/cxgb3i_offload.h231
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.h b/drivers/scsi/cxgb3i/cxgb3i_offload.h
new file mode 100644
index 000000000000..5b93d629e5c1
--- /dev/null
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.h
@@ -0,0 +1,231 @@
+/*
+ * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
+ *
+ * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
+ * release for licensing terms and conditions.
+ *
+ * Written by: Dimitris Michailidis (dm@chelsio.com)
+ * Karen Xie (kxie@chelsio.com)
+ */
+
+#ifndef _CXGB3I_OFFLOAD_H
+#define _CXGB3I_OFFLOAD_H
+
+#include <linux/skbuff.h>
+#include <net/tcp.h>
+
+#include "common.h"
+#include "adapter.h"
+#include "t3cdev.h"
+#include "cxgb3_offload.h"
+
+#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
+#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
+#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
+#define cxgb3i_log_debug(fmt, args...) \
+ printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
+
+/**
+ * struct s3_conn - an iscsi tcp connection structure
+ *
+ * @dev: net device of with connection
+ * @cdev: adapter t3cdev for net device
+ * @flags: see c3cn_flags below
+ * @tid: connection id assigned by the h/w
+ * @qset: queue set used by connection
+ * @mss_idx: Maximum Segment Size table index
+ * @l2t: ARP resolution entry for offload packets
+ * @wr_max: maximum in-flight writes
+ * @wr_avail: number of writes available
+ * @wr_unacked: writes since last request for completion notification
+ * @wr_pending_head: head of pending write queue
+ * @wr_pending_tail: tail of pending write queue
+ * @cpl_close: skb for cpl_close_req
+ * @cpl_abort_req: skb for cpl_abort_req
+ * @cpl_abort_rpl: skb for cpl_abort_rpl
+ * @lock: connection status lock
+ * @refcnt: reference count on connection
+ * @state: connection state
+ * @saddr: source ip/port address
+ * @daddr: destination ip/port address
+ * @dst_cache: reference to destination route
+ * @receive_queue: received PDUs
+ * @write_queue: un-pushed pending writes
+ * @retry_timer: retry timer for various operations
+ * @err: connection error status
+ * @callback_lock: lock for opaque user context
+ * @user_data: opaque user context
+ * @rcv_nxt: next receive seq. #
+ * @copied_seq: head of yet unread data
+ * @rcv_wup: rcv_nxt on last window update sent
+ * @snd_nxt: next sequence we send
+ * @snd_una: first byte we want an ack for
+ * @write_seq: tail+1 of data held in send buffer
+ */
+struct s3_conn {
+ struct net_device *dev;
+ struct t3cdev *cdev;
+ unsigned long flags;
+ int tid;
+ int qset;
+ int mss_idx;
+ struct l2t_entry *l2t;
+ int wr_max;
+ int wr_avail;
+ int wr_unacked;
+ struct sk_buff *wr_pending_head;
+ struct sk_buff *wr_pending_tail;
+ struct sk_buff *cpl_close;
+ struct sk_buff *cpl_abort_req;
+ struct sk_buff *cpl_abort_rpl;
+ spinlock_t lock;
+ atomic_t refcnt;
+ volatile unsigned int state;
+ struct sockaddr_in saddr;
+ struct sockaddr_in daddr;
+ struct dst_entry *dst_cache;
+ struct sk_buff_head receive_queue;
+ struct sk_buff_head write_queue;
+ struct timer_list retry_timer;
+ int err;
+ rwlock_t callback_lock;
+ void *user_data;
+
+ u32 rcv_nxt;
+ u32 copied_seq;
+ u32 rcv_wup;
+ u32 snd_nxt;
+ u32 snd_una;
+ u32 write_seq;
+};
+
+/*
+ * connection state
+ */
+enum conn_states {
+ C3CN_STATE_CONNECTING = 1,
+ C3CN_STATE_ESTABLISHED,
+ C3CN_STATE_ACTIVE_CLOSE,
+ C3CN_STATE_PASSIVE_CLOSE,
+ C3CN_STATE_CLOSE_WAIT_1,
+ C3CN_STATE_CLOSE_WAIT_2,
+ C3CN_STATE_ABORTING,
+ C3CN_STATE_CLOSED,
+};
+
+static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
+{
+ return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
+}
+static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
+{
+ return c3cn->state == C3CN_STATE_ESTABLISHED;
+}
+
+/*
+ * Connection flags -- many to track some close related events.
+ */
+enum c3cn_flags {
+ C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
+ C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
+ C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
+ C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
+ C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
+};
+
+/**
+ * cxgb3i_sdev_data - Per adapter data.
+ * Linked off of each Ethernet device port on the adapter.
+ * Also available via the t3cdev structure since we have pointers to our port
+ * net_device's there ...
+ *
+ * @list: list head to link elements
+ * @cdev: t3cdev adapter
+ * @client: CPL client pointer
+ * @ports: array of adapter ports
+ * @sport_map_next: next index into the port map
+ * @sport_map: source port map
+ */
+struct cxgb3i_sdev_data {
+ struct list_head list;
+ struct t3cdev *cdev;
+ struct cxgb3_client *client;
+ struct adap_ports ports;
+ unsigned int sport_map_next;
+ unsigned long sport_map[0];
+};
+#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
+#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
+
+void cxgb3i_sdev_cleanup(void);
+int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
+void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
+void cxgb3i_sdev_remove(struct t3cdev *);
+
+struct s3_conn *cxgb3i_c3cn_create(void);
+int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
+void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
+int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
+void cxgb3i_c3cn_release(struct s3_conn *);
+
+/**
+ * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
+ *
+ * @flag: see C3CB_FLAG_* below
+ * @ulp_mode: ULP mode/submode of sk_buff
+ * @seq: tcp sequence number
+ * @ddigest: pdu data digest
+ * @pdulen: recovered pdu length
+ * @ulp_data: scratch area for ULP
+ */
+struct cxgb3_skb_cb {
+ __u8 flags;
+ __u8 ulp_mode;
+ __u32 seq;
+ __u32 ddigest;
+ __u32 pdulen;
+ __u8 ulp_data[16];
+};
+
+#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
+
+#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
+#define skb_ulp_ddigest(skb) (CXGB3_SKB_CB(skb)->ddigest)
+#define skb_ulp_pdulen(skb) (CXGB3_SKB_CB(skb)->pdulen)
+#define skb_ulp_data(skb) (CXGB3_SKB_CB(skb)->ulp_data)
+
+enum c3cb_flags {
+ C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
+ C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
+ C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
+};
+
+/**
+ * sge_opaque_hdr -
+ * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
+ * and for which we must reserve space.
+ */
+struct sge_opaque_hdr {
+ void *dev;
+ dma_addr_t addr[MAX_SKB_FRAGS + 1];
+};
+
+/* 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))
+
+/*
+ * get and set private ip for iscsi traffic
+ */
+#define cxgb3i_get_private_ipv4addr(ndev) \
+ (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
+#define cxgb3i_set_private_ipv4addr(ndev, addr) \
+ (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
+
+/* max. connections per adapter */
+#define CXGB3I_MAX_CONN 16384
+#endif /* _CXGB3_OFFLOAD_H */