cxgbit: add files for cxgbit.ko

cxgbit.h - This file contains data structure
definitions for cxgbit.ko.

cxgbit_lro.h - This file contains data structure
definitions for LRO support.

cxgbit_main.c - This file contains code for
registering with iscsi target transport and
cxgb4 driver.

cxgbit_cm.c - This file contains code for
connection management.

cxgbit_target.c - This file contains code
for processing iSCSI PDU.

cxgbit_ddp.c - This file contains code for
Direct Data Placement.

(added check for NULL sg in cxgbit_set_one_ppod)
 Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

(add Kconfig and Makefile v2: added dependency on INET)
 Reported-by: Arnd Bergmann <arnd@arndb.de>

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 353 insertions, 0 deletions

diff --git a/drivers/target/iscsi/cxgbit/cxgbit.h b/drivers/target/iscsi/cxgbit/cxgbit.h
new file mode 100644
index 000000000000..625c7f6de6b2
--- /dev/null
+++ b/drivers/target/iscsi/cxgbit/cxgbit.h
@@ -0,0 +1,353 @@
+/*
+ * Copyright (c) 2016 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __CXGBIT_H__
+#define __CXGBIT_H__
+
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/idr.h>
+#include <linux/completion.h>
+#include <linux/netdevice.h>
+#include <linux/sched.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/inet.h>
+#include <linux/wait.h>
+#include <linux/kref.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+
+#include <asm/byteorder.h>
+
+#include <net/net_namespace.h>
+
+#include <target/iscsi/iscsi_transport.h>
+#include <iscsi_target_parameters.h>
+#include <iscsi_target_login.h>
+
+#include "t4_regs.h"
+#include "t4_msg.h"
+#include "cxgb4.h"
+#include "cxgb4_uld.h"
+#include "l2t.h"
+#include "cxgb4_ppm.h"
+#include "cxgbit_lro.h"
+
+extern struct mutex cdev_list_lock;
+extern struct list_head cdev_list_head;
+struct cxgbit_np;
+
+struct cxgbit_sock;
+
+struct cxgbit_cmd {
+	struct scatterlist sg;
+	struct cxgbi_task_tag_info ttinfo;
+	bool setup_ddp;
+	bool release;
+};
+
+#define CXGBIT_MAX_ISO_PAYLOAD	\
+	min_t(u32, MAX_SKB_FRAGS * PAGE_SIZE, 65535)
+
+struct cxgbit_iso_info {
+	u8 flags;
+	u32 mpdu;
+	u32 len;
+	u32 burst_len;
+};
+
+enum cxgbit_skcb_flags {
+	SKCBF_TX_NEED_HDR	= (1 << 0), /* packet needs a header */
+	SKCBF_TX_FLAG_COMPL	= (1 << 1), /* wr completion flag */
+	SKCBF_TX_ISO		= (1 << 2), /* iso cpl in tx skb */
+	SKCBF_RX_LRO		= (1 << 3), /* lro skb */
+};
+
+struct cxgbit_skb_rx_cb {
+	u8 opcode;
+	void *pdu_cb;
+	void (*backlog_fn)(struct cxgbit_sock *, struct sk_buff *);
+};
+
+struct cxgbit_skb_tx_cb {
+	u8 submode;
+	u32 extra_len;
+};
+
+union cxgbit_skb_cb {
+	struct {
+		u8 flags;
+		union {
+			struct cxgbit_skb_tx_cb tx;
+			struct cxgbit_skb_rx_cb rx;
+		};
+	};
+
+	struct {
+		/* This member must be first. */
+		struct l2t_skb_cb l2t;
+		struct sk_buff *wr_next;
+	};
+};
+
+#define CXGBIT_SKB_CB(skb)	((union cxgbit_skb_cb *)&((skb)->cb[0]))
+#define cxgbit_skcb_flags(skb)		(CXGBIT_SKB_CB(skb)->flags)
+#define cxgbit_skcb_submode(skb)	(CXGBIT_SKB_CB(skb)->tx.submode)
+#define cxgbit_skcb_tx_wr_next(skb)	(CXGBIT_SKB_CB(skb)->wr_next)
+#define cxgbit_skcb_tx_extralen(skb)	(CXGBIT_SKB_CB(skb)->tx.extra_len)
+#define cxgbit_skcb_rx_opcode(skb)	(CXGBIT_SKB_CB(skb)->rx.opcode)
+#define cxgbit_skcb_rx_backlog_fn(skb)	(CXGBIT_SKB_CB(skb)->rx.backlog_fn)
+#define cxgbit_rx_pdu_cb(skb)		(CXGBIT_SKB_CB(skb)->rx.pdu_cb)
+
+static inline void *cplhdr(struct sk_buff *skb)
+{
+	return skb->data;
+}
+
+enum cxgbit_cdev_flags {
+	CDEV_STATE_UP = 0,
+	CDEV_ISO_ENABLE,
+	CDEV_DDP_ENABLE,
+};
+
+#define NP_INFO_HASH_SIZE 32
+
+struct np_info {
+	struct np_info *next;
+	struct cxgbit_np *cnp;
+	unsigned int stid;
+};
+
+struct cxgbit_list_head {
+	struct list_head list;
+	/* device lock */
+	spinlock_t lock;
+};
+
+struct cxgbit_device {
+	struct list_head list;
+	struct cxgb4_lld_info lldi;
+	struct np_info *np_hash_tab[NP_INFO_HASH_SIZE];
+	/* np lock */
+	spinlock_t np_lock;
+	u8 selectq[MAX_NPORTS][2];
+	struct cxgbit_list_head cskq;
+	u32 mdsl;
+	struct kref kref;
+	unsigned long flags;
+};
+
+struct cxgbit_wr_wait {
+	struct completion completion;
+	int ret;
+};
+
+enum cxgbit_csk_state {
+	CSK_STATE_IDLE = 0,
+	CSK_STATE_LISTEN,
+	CSK_STATE_CONNECTING,
+	CSK_STATE_ESTABLISHED,
+	CSK_STATE_ABORTING,
+	CSK_STATE_CLOSING,
+	CSK_STATE_MORIBUND,
+	CSK_STATE_DEAD,
+};
+
+enum cxgbit_csk_flags {
+	CSK_TX_DATA_SENT = 0,
+	CSK_LOGIN_PDU_DONE,
+	CSK_LOGIN_DONE,
+	CSK_DDP_ENABLE,
+};
+
+struct cxgbit_sock_common {
+	struct cxgbit_device *cdev;
+	struct sockaddr_storage local_addr;
+	struct sockaddr_storage remote_addr;
+	struct cxgbit_wr_wait wr_wait;
+	enum cxgbit_csk_state state;
+	unsigned long flags;
+};
+
+struct cxgbit_np {
+	struct cxgbit_sock_common com;
+	wait_queue_head_t accept_wait;
+	struct iscsi_np *np;
+	struct completion accept_comp;
+	struct list_head np_accept_list;
+	/* np accept lock */
+	spinlock_t np_accept_lock;
+	struct kref kref;
+	unsigned int stid;
+};
+
+struct cxgbit_sock {
+	struct cxgbit_sock_common com;
+	struct cxgbit_np *cnp;
+	struct iscsi_conn *conn;
+	struct l2t_entry *l2t;
+	struct dst_entry *dst;
+	struct list_head list;
+	struct sk_buff_head rxq;
+	struct sk_buff_head txq;
+	struct sk_buff_head ppodq;
+	struct sk_buff_head backlogq;
+	struct sk_buff_head skbq;
+	struct sk_buff *wr_pending_head;
+	struct sk_buff *wr_pending_tail;
+	struct sk_buff *skb;
+	struct sk_buff *lro_skb;
+	struct sk_buff *lro_hskb;
+	struct list_head accept_node;
+	/* socket lock */
+	spinlock_t lock;
+	wait_queue_head_t waitq;
+	wait_queue_head_t ack_waitq;
+	bool lock_owner;
+	struct kref kref;
+	u32 max_iso_npdu;
+	u32 wr_cred;
+	u32 wr_una_cred;
+	u32 wr_max_cred;
+	u32 snd_una;
+	u32 tid;
+	u32 snd_nxt;
+	u32 rcv_nxt;
+	u32 smac_idx;
+	u32 tx_chan;
+	u32 mtu;
+	u32 write_seq;
+	u32 rx_credits;
+	u32 snd_win;
+	u32 rcv_win;
+	u16 mss;
+	u16 emss;
+	u16 plen;
+	u16 rss_qid;
+	u16 txq_idx;
+	u16 ctrlq_idx;
+	u8 tos;
+	u8 port_id;
+#define CXGBIT_SUBMODE_HCRC 0x1
+#define CXGBIT_SUBMODE_DCRC 0x2
+	u8 submode;
+#ifdef CONFIG_CHELSIO_T4_DCB
+	u8 dcb_priority;
+#endif
+	u8 snd_wscale;
+};
+
+void _cxgbit_free_cdev(struct kref *kref);
+void _cxgbit_free_csk(struct kref *kref);
+void _cxgbit_free_cnp(struct kref *kref);
+
+static inline void cxgbit_get_cdev(struct cxgbit_device *cdev)
+{
+	kref_get(&cdev->kref);
+}
+
+static inline void cxgbit_put_cdev(struct cxgbit_device *cdev)
+{
+	kref_put(&cdev->kref, _cxgbit_free_cdev);
+}
+
+static inline void cxgbit_get_csk(struct cxgbit_sock *csk)
+{
+	kref_get(&csk->kref);
+}
+
+static inline void cxgbit_put_csk(struct cxgbit_sock *csk)
+{
+	kref_put(&csk->kref, _cxgbit_free_csk);
+}
+
+static inline void cxgbit_get_cnp(struct cxgbit_np *cnp)
+{
+	kref_get(&cnp->kref);
+}
+
+static inline void cxgbit_put_cnp(struct cxgbit_np *cnp)
+{
+	kref_put(&cnp->kref, _cxgbit_free_cnp);
+}
+
+static inline void cxgbit_sock_reset_wr_list(struct cxgbit_sock *csk)
+{
+	csk->wr_pending_tail = NULL;
+	csk->wr_pending_head = NULL;
+}
+
+static inline struct sk_buff *cxgbit_sock_peek_wr(const struct cxgbit_sock *csk)
+{
+	return csk->wr_pending_head;
+}
+
+static inline void
+cxgbit_sock_enqueue_wr(struct cxgbit_sock *csk, struct sk_buff *skb)
+{
+	cxgbit_skcb_tx_wr_next(skb) = NULL;
+
+	skb_get(skb);
+
+	if (!csk->wr_pending_head)
+		csk->wr_pending_head = skb;
+	else
+		cxgbit_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
+	csk->wr_pending_tail = skb;
+}
+
+static inline struct sk_buff *cxgbit_sock_dequeue_wr(struct cxgbit_sock *csk)
+{
+	struct sk_buff *skb = csk->wr_pending_head;
+
+	if (likely(skb)) {
+		csk->wr_pending_head = cxgbit_skcb_tx_wr_next(skb);
+		cxgbit_skcb_tx_wr_next(skb) = NULL;
+	}
+	return skb;
+}
+
+typedef void (*cxgbit_cplhandler_func)(struct cxgbit_device *,
+				       struct sk_buff *);
+
+int cxgbit_setup_np(struct iscsi_np *, struct sockaddr_storage *);
+int cxgbit_setup_conn_digest(struct cxgbit_sock *);
+int cxgbit_accept_np(struct iscsi_np *, struct iscsi_conn *);
+void cxgbit_free_np(struct iscsi_np *);
+void cxgbit_free_conn(struct iscsi_conn *);
+extern cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS];
+int cxgbit_get_login_rx(struct iscsi_conn *, struct iscsi_login *);
+int cxgbit_rx_data_ack(struct cxgbit_sock *);
+int cxgbit_l2t_send(struct cxgbit_device *, struct sk_buff *,
+		    struct l2t_entry *);
+void cxgbit_push_tx_frames(struct cxgbit_sock *);
+int cxgbit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32);
+int cxgbit_xmit_pdu(struct iscsi_conn *, struct iscsi_cmd *,
+		    struct iscsi_datain_req *, const void *, u32);
+void cxgbit_get_r2t_ttt(struct iscsi_conn *, struct iscsi_cmd *,
+			struct iscsi_r2t *);
+u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *);
+int cxgbit_ofld_send(struct cxgbit_device *, struct sk_buff *);
+void cxgbit_get_rx_pdu(struct iscsi_conn *);
+int cxgbit_validate_params(struct iscsi_conn *);
+struct cxgbit_device *cxgbit_find_device(struct net_device *, u8 *);
+
+/* DDP */
+int cxgbit_ddp_init(struct cxgbit_device *);
+int cxgbit_setup_conn_pgidx(struct cxgbit_sock *, u32);
+int cxgbit_reserve_ttt(struct cxgbit_sock *, struct iscsi_cmd *);
+void cxgbit_release_cmd(struct iscsi_conn *, struct iscsi_cmd *);
+
+static inline
+struct cxgbi_ppm *cdev2ppm(struct cxgbit_device *cdev)
+{
+	return (struct cxgbi_ppm *)(*cdev->lldi.iscsi_ppm);
+}
+#endif /* __CXGBIT_H__ */