cregit-Linux how code gets into the kernel

Release 4.8 net/rds/rds.h

Directory: net/rds
#ifndef _RDS_RDS_H

#define _RDS_RDS_H

#include <net/sock.h>
#include <linux/scatterlist.h>
#include <linux/highmem.h>
#include <rdma/rdma_cm.h>
#include <linux/mutex.h>
#include <linux/rds.h>
#include <linux/rhashtable.h>

#include "info.h"

/*
 * RDS Network protocol version
 */

#define RDS_PROTOCOL_3_0	0x0300

#define RDS_PROTOCOL_3_1	0x0301

#define RDS_PROTOCOL_VERSION	RDS_PROTOCOL_3_1

#define RDS_PROTOCOL_MAJOR(v)	((v) >> 8)

#define RDS_PROTOCOL_MINOR(v)	((v) & 255)

#define RDS_PROTOCOL(maj, min)	(((maj) << 8) | min)

/*
 * XXX randomly chosen, but at least seems to be unused:
 * #               18464-18768 Unassigned
 * We should do better.  We want a reserved port to discourage unpriv'ed
 * userspace from listening.
 */

#define RDS_PORT	18634

#ifdef ATOMIC64_INIT

#define KERNEL_HAS_ATOMIC64
#endif

#ifdef DEBUG

#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
#else
/* sigh, pr_debug() causes unused variable warnings */
static inline __printf(1, 2)

void rdsdebug(char *fmt, ...)
{
}
#endif

/* XXX is there one of these somewhere? */

#define ceil(x, y) \
	({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })


#define RDS_FRAG_SHIFT	12

#define RDS_FRAG_SIZE	((unsigned int)(1 << RDS_FRAG_SHIFT))


#define RDS_CONG_MAP_BYTES	(65536 / 8)

#define RDS_CONG_MAP_PAGES	(PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)

#define RDS_CONG_MAP_PAGE_BITS	(PAGE_SIZE * 8)

struct 
rds_cong_map {
        struct 
rb_node		m_rb_node;
	
__be32			m_addr;
	
wait_queue_head_t	m_waitq;
        struct 
list_head	m_conn_list;
	
unsigned long		m_page_addrs[RDS_CONG_MAP_PAGES];
};


/*
 * This is how we will track the connection state:
 * A connection is always in one of the following
 * states. Updates to the state are atomic and imply
 * a memory barrier.
 */
enum {
	
RDS_CONN_DOWN = 0,
	
RDS_CONN_CONNECTING,
	
RDS_CONN_DISCONNECTING,
	
RDS_CONN_UP,
	
RDS_CONN_RESETTING,
	
RDS_CONN_ERROR,
};

/* Bits for c_flags */

#define RDS_LL_SEND_FULL	0

#define RDS_RECONNECT_PENDING	1

#define RDS_IN_XMIT		2

#define RDS_RECV_REFILL		3

/* Max number of multipaths per RDS connection. Must be a power of 2 */

#define	RDS_MPATH_WORKERS	8

#define	RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
                               (rs)->rs_hash_initval) & ((n) - 1))

/* Per mpath connection state */

struct rds_conn_path {
	
struct rds_connection	*cp_conn;
	
struct rds_message	*cp_xmit_rm;
	
unsigned long		cp_xmit_sg;
	
unsigned int		cp_xmit_hdr_off;
	
unsigned int		cp_xmit_data_off;
	
unsigned int		cp_xmit_atomic_sent;
	
unsigned int		cp_xmit_rdma_sent;
	
unsigned int		cp_xmit_data_sent;

	
spinlock_t		cp_lock;		/* protect msg queues */
	
u64			cp_next_tx_seq;
	
struct list_head	cp_send_queue;
	
struct list_head	cp_retrans;

	
u64			cp_next_rx_seq;

	
void			*cp_transport_data;

	
atomic_t		cp_state;
	
unsigned long		cp_send_gen;
	
unsigned long		cp_flags;
	
unsigned long		cp_reconnect_jiffies;
	
struct delayed_work	cp_send_w;
	
struct delayed_work	cp_recv_w;
	
struct delayed_work	cp_conn_w;
	
struct work_struct	cp_down_w;
	
struct mutex		cp_cm_lock;	/* protect cp_state & cm */
	
wait_queue_head_t	cp_waitq;

	
unsigned int		cp_unacked_packets;
	
unsigned int		cp_unacked_bytes;
	
unsigned int		cp_outgoing:1,
				
cp_pad_to_32:31;
	
unsigned int		cp_index;
};

/* One rds_connection per RDS address pair */

struct rds_connection {
	
struct hlist_node	c_hash_node;
	
__be32			c_laddr;
	
__be32			c_faddr;
	
unsigned int		c_loopback:1,
				
c_ping_triggered:1,
				
c_pad_to_32:30;
	
int			c_npaths;
	
struct rds_connection	*c_passive;
	
struct rds_transport	*c_trans;

	
struct rds_cong_map	*c_lcong;
	
struct rds_cong_map	*c_fcong;

	/* Protocol version */
	
unsigned int		c_version;
	
possible_net_t		c_net;

	
struct list_head	c_map_item;
	
unsigned long		c_map_queued;

	
struct rds_conn_path	c_path[RDS_MPATH_WORKERS];
	
wait_queue_head_t	c_hs_waitq; /* handshake waitq */
};


static inline struct net *rds_conn_net(struct rds_connection *conn) { return read_pnet(&conn->c_net); }

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static inline void rds_conn_net_set(struct rds_connection *conn, struct net *net) { write_pnet(&conn->c_net, net); }

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#define RDS_FLAG_CONG_BITMAP 0x01 #define RDS_FLAG_ACK_REQUIRED 0x02 #define RDS_FLAG_RETRANSMITTED 0x04 #define RDS_MAX_ADV_CREDIT 255 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping * probe to exchange control information before establishing a connection. * Currently the control information that is exchanged is the number of * supported paths. If the peer is a legacy (older kernel revision) peer, * it would return a pong message without additional control information * that would then alert the sender that the peer was an older rev. */ #define RDS_FLAG_PROBE_PORT 1 #define RDS_HS_PROBE(sport, dport) \ ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) /* * Maximum space available for extension headers. */ #define RDS_HEADER_EXT_SPACE 16 struct rds_header { __be64 h_sequence; __be64 h_ack; __be32 h_len; __be16 h_sport; __be16 h_dport; u8 h_flags; u8 h_credit; u8 h_padding[4]; __sum16 h_csum; u8 h_exthdr[RDS_HEADER_EXT_SPACE]; }; /* * Reserved - indicates end of extensions */ #define RDS_EXTHDR_NONE 0 /* * This extension header is included in the very * first message that is sent on a new connection, * and identifies the protocol level. This will help * rolling updates if a future change requires breaking * the protocol. * NB: This is no longer true for IB, where we do a version * negotiation during the connection setup phase (protocol * version information is included in the RDMA CM private data). */ #define RDS_EXTHDR_VERSION 1 struct rds_ext_header_version { __be32 h_version; }; /* * This extension header is included in the RDS message * chasing an RDMA operation. */ #define RDS_EXTHDR_RDMA 2 struct rds_ext_header_rdma { __be32 h_rdma_rkey; }; /* * This extension header tells the peer about the * destination <R_Key,offset> of the requested RDMA * operation. */ #define RDS_EXTHDR_RDMA_DEST 3 struct rds_ext_header_rdma_dest { __be32 h_rdma_rkey; __be32 h_rdma_offset; }; /* Extension header announcing number of paths. * Implicit length = 2 bytes. */ #define RDS_EXTHDR_NPATHS 4 #define __RDS_EXTHDR_MAX 16 /* for now */ struct rds_incoming { atomic_t i_refcount; struct list_head i_item; struct rds_connection *i_conn; struct rds_conn_path *i_conn_path; struct rds_header i_hdr; unsigned long i_rx_jiffies; __be32 i_saddr; rds_rdma_cookie_t i_rdma_cookie; struct timeval i_rx_tstamp; }; struct rds_mr { struct rb_node r_rb_node; atomic_t r_refcount; u32 r_key; /* A copy of the creation flags */ unsigned int r_use_once:1; unsigned int r_invalidate:1; unsigned int r_write:1; /* This is for RDS_MR_DEAD. * It would be nice & consistent to make this part of the above * bit field here, but we need to use test_and_set_bit. */ unsigned long r_state; struct rds_sock *r_sock; /* back pointer to the socket that owns us */ struct rds_transport *r_trans; void *r_trans_private; }; /* Flags for mr->r_state */ #define RDS_MR_DEAD 0
static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) { return r_key | (((u64) offset) << 32); }

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static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) { return cookie; }

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static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) { return cookie >> 32; }

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/* atomic operation types */ #define RDS_ATOMIC_TYPE_CSWP 0 #define RDS_ATOMIC_TYPE_FADD 1 /* * m_sock_item and m_conn_item are on lists that are serialized under * conn->c_lock. m_sock_item has additional meaning in that once it is empty * the message will not be put back on the retransmit list after being sent. * messages that are canceled while being sent rely on this. * * m_inc is used by loopback so that it can pass an incoming message straight * back up into the rx path. It embeds a wire header which is also used by * the send path, which is kind of awkward. * * m_sock_item indicates the message's presence on a socket's send or receive * queue. m_rs will point to that socket. * * m_daddr is used by cancellation to prune messages to a given destination. * * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock * nesting. As paths iterate over messages on a sock, or conn, they must * also lock the conn, or sock, to remove the message from those lists too. * Testing the flag to determine if the message is still on the lists lets * us avoid testing the list_head directly. That means each path can use * the message's list_head to keep it on a local list while juggling locks * without confusing the other path. * * m_ack_seq is an optional field set by transports who need a different * sequence number range to invalidate. They can use this in a callback * that they pass to rds_send_drop_acked() to see if each message has been * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't * had ack_seq set yet. */ #define RDS_MSG_ON_SOCK 1 #define RDS_MSG_ON_CONN 2 #define RDS_MSG_HAS_ACK_SEQ 3 #define RDS_MSG_ACK_REQUIRED 4 #define RDS_MSG_RETRANSMITTED 5 #define RDS_MSG_MAPPED 6 #define RDS_MSG_PAGEVEC 7 struct rds_message { atomic_t m_refcount; struct list_head m_sock_item; struct list_head m_conn_item; struct rds_incoming m_inc; u64 m_ack_seq; __be32 m_daddr; unsigned long m_flags; /* Never access m_rs without holding m_rs_lock. * Lock nesting is * rm->m_rs_lock * -> rs->rs_lock */ spinlock_t m_rs_lock; wait_queue_head_t m_flush_wait; struct rds_sock *m_rs; /* cookie to send to remote, in rds header */ rds_rdma_cookie_t m_rdma_cookie; unsigned int m_used_sgs; unsigned int m_total_sgs; void *m_final_op; struct { struct rm_atomic_op { int op_type; union { struct { uint64_t compare; uint64_t swap; uint64_t compare_mask; uint64_t swap_mask; } op_m_cswp; struct { uint64_t add; uint64_t nocarry_mask; } op_m_fadd; }; u32 op_rkey; u64 op_remote_addr; unsigned int op_notify:1; unsigned int op_recverr:1; unsigned int op_mapped:1; unsigned int op_silent:1; unsigned int op_active:1; struct scatterlist *op_sg; struct rds_notifier *op_notifier; struct rds_mr *op_rdma_mr; } atomic; struct rm_rdma_op { u32 op_rkey; u64 op_remote_addr; unsigned int op_write:1; unsigned int op_fence:1; unsigned int op_notify:1; unsigned int op_recverr:1; unsigned int op_mapped:1; unsigned int op_silent:1; unsigned int op_active:1; unsigned int op_bytes; unsigned int op_nents; unsigned int op_count; struct scatterlist *op_sg; struct rds_notifier *op_notifier; struct rds_mr *op_rdma_mr; } rdma; struct rm_data_op { unsigned int op_active:1; unsigned int op_nents; unsigned int op_count; unsigned int op_dmasg; unsigned int op_dmaoff; struct scatterlist *op_sg; } data; }; }; /* * The RDS notifier is used (optionally) to tell the application about * completed RDMA operations. Rather than keeping the whole rds message * around on the queue, we allocate a small notifier that is put on the * socket's notifier_list. Notifications are delivered to the application * through control messages. */ struct rds_notifier { struct list_head n_list; uint64_t n_user_token; int n_status; }; /** * struct rds_transport - transport specific behavioural hooks * * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send * part of a message. The caller serializes on the send_sem so this * doesn't need to be reentrant for a given conn. The header must be * sent before the data payload. .xmit must be prepared to send a * message with no data payload. .xmit should return the number of * bytes that were sent down the connection, including header bytes. * Returning 0 tells the caller that it doesn't need to perform any * additional work now. This is usually the case when the transport has * filled the sending queue for its connection and will handle * triggering the rds thread to continue the send when space becomes * available. Returning -EAGAIN tells the caller to retry the send * immediately. Returning -ENOMEM tells the caller to retry the send at * some point in the future. * * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once * it returns the connection can not call rds_recv_incoming(). * This will only be called once after conn_connect returns * non-zero success and will The caller serializes this with * the send and connecting paths (xmit_* and conn_*). The * transport is responsible for other serialization, including * rds_recv_incoming(). This is called in process context but * should try hard not to block. */ struct rds_transport { char t_name[TRANSNAMSIZ]; struct list_head t_item; struct module *t_owner; unsigned int t_prefer_loopback:1, t_mp_capable:1; unsigned int t_type; int (*laddr_check)(struct net *net, __be32 addr); int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); void (*conn_free)(void *data); int (*conn_path_connect)(struct rds_conn_path *cp); void (*conn_path_shutdown)(struct rds_conn_path *conn); void (*xmit_path_prepare)(struct rds_conn_path *cp); void (*xmit_path_complete)(struct rds_conn_path *cp); int (*xmit)(struct rds_connection *conn, struct rds_message *rm, unsigned int hdr_off, unsigned int sg, unsigned int off); int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); int (*recv_path)(struct rds_conn_path *cp); int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); void (*inc_free)(struct rds_incoming *inc); int (*cm_handle_connect)(struct rdma_cm_id *cm_id, struct rdma_cm_event *event); int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); void (*cm_connect_complete)(struct rds_connection *conn, struct rdma_cm_event *event); unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, unsigned int avail); void (*exit)(void); void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, struct rds_sock *rs, u32 *key_ret); void (*sync_mr)(void *trans_private, int direction); void (*free_mr)(void *trans_private, int invalidate); void (*flush_mrs)(void); }; struct rds_sock { struct sock rs_sk; u64 rs_user_addr; u64 rs_user_bytes; /* * bound_addr used for both incoming and outgoing, no INADDR_ANY * support. */ struct rhash_head rs_bound_node; u64 rs_bound_key; __be32 rs_bound_addr; __be32 rs_conn_addr; __be16 rs_bound_port; __be16 rs_conn_port; struct rds_transport *rs_transport; /* * rds_sendmsg caches the conn it used the last time around. * This helps avoid costly lookups. */ struct rds_connection *rs_conn; /* flag indicating we were congested or not */ int rs_congested; /* seen congestion (ENOBUFS) when sending? */ int rs_seen_congestion; /* rs_lock protects all these adjacent members before the newline */ spinlock_t rs_lock; struct list_head rs_send_queue; u32 rs_snd_bytes; int rs_rcv_bytes; struct list_head rs_notify_queue; /* currently used for failed RDMAs */ /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask * to decide whether the application should be woken up. * If not set, we use rs_cong_track to find out whether a cong map * update arrived. */ uint64_t rs_cong_mask; uint64_t rs_cong_notify; struct list_head rs_cong_list; unsigned long rs_cong_track; /* * rs_recv_lock protects the receive queue, and is * used to serialize with rds_release. */ rwlock_t rs_recv_lock; struct list_head rs_recv_queue; /* just for stats reporting */ struct list_head rs_item; /* these have their own lock */ spinlock_t rs_rdma_lock; struct rb_root rs_rdma_keys; /* Socket options - in case there will be more */ unsigned char rs_recverr, rs_cong_monitor; u32 rs_hash_initval; };
static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) { return container_of(sk, struct rds_sock, rs_sk); }

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static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) { return &rs->rs_sk; }

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/* * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value * to account for overhead. We don't account for overhead, we just apply * the number of payload bytes to the specified value. */
static inline int rds_sk_sndbuf(struct rds_sock *rs) { return rds_rs_to_sk(rs)->sk_sndbuf / 2; }

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static inline int rds_sk_rcvbuf(struct rds_sock *rs) { return rds_rs_to_sk(rs)->sk_rcvbuf / 2; }

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struct rds_statistics { uint64_t s_conn_reset; uint64_t s_recv_drop_bad_checksum; uint64_t s_recv_drop_old_seq; uint64_t s_recv_drop_no_sock; uint64_t s_recv_drop_dead_sock; uint64_t s_recv_deliver_raced; uint64_t s_recv_delivered; uint64_t s_recv_queued; uint64_t s_recv_immediate_retry; uint64_t s_recv_delayed_retry; uint64_t s_recv_ack_required; uint64_t s_recv_rdma_bytes; uint64_t s_recv_ping; uint64_t s_send_queue_empty; uint64_t s_send_queue_full; uint64_t s_send_lock_contention; uint64_t s_send_lock_queue_raced; uint64_t s_send_immediate_retry; uint64_t s_send_delayed_retry; uint64_t s_send_drop_acked; uint64_t s_send_ack_required; uint64_t s_send_queued; uint64_t s_send_rdma; uint64_t s_send_rdma_bytes; uint64_t s_send_pong; uint64_t s_page_remainder_hit; uint64_t s_page_remainder_miss; uint64_t s_copy_to_user; uint64_t s_copy_from_user; uint64_t s_cong_update_queued; uint64_t s_cong_update_received; uint64_t s_cong_send_error; uint64_t s_cong_send_blocked; }; /* af_rds.c */ void rds_sock_addref(struct rds_sock *rs); void rds_sock_put(struct rds_sock *rs); void rds_wake_sk_sleep(struct rds_sock *rs);
static inline void __rds_wake_sk_sleep(struct sock *sk) { wait_queue_head_t *waitq = sk_sleep(sk); if (!sock_flag(sk, SOCK_DEAD) && waitq) wake_up(waitq); }

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extern wait_queue_head_t rds_poll_waitq; /* bind.c */ int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); void rds_remove_bound(struct rds_sock *rs); struct rds_sock *rds_find_bound(__be32 addr, __be16 port); int rds_bind_lock_init(void); void rds_bind_lock_destroy(void); /* cong.c */ int rds_cong_get_maps(struct rds_connection *conn); void rds_cong_add_conn(struct rds_connection *conn); void rds_cong_remove_conn(struct rds_connection *conn); void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); void rds_cong_queue_updates(struct rds_cong_map *map); void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); int rds_cong_updated_since(unsigned long *recent); void rds_cong_add_socket(struct rds_sock *); void rds_cong_remove_socket(struct rds_sock *); void rds_cong_exit(void); struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); /* conn.c */ int rds_conn_init(void); void rds_conn_exit(void); struct rds_connection *rds_conn_create(struct net *net, __be32 laddr, __be32 faddr, struct rds_transport *trans, gfp_t gfp); struct rds_connection *rds_conn_create_outgoing(struct net *net, __be32 laddr, __be32 faddr, struct rds_transport *trans, gfp_t gfp); void rds_conn_shutdown(struct rds_conn_path *cpath); void rds_conn_destroy(struct rds_connection *conn); void rds_conn_drop(struct rds_connection *conn); void rds_conn_path_drop(struct rds_conn_path *cpath); void rds_conn_connect_if_down(struct rds_connection *conn); void rds_conn_path_connect_if_down(struct rds_conn_path *cp); void rds_for_each_conn_info(struct socket *sock, unsigned int len, struct rds_info_iterator *iter, struct rds_info_lengths *lens, int (*visitor)(struct rds_connection *, void *), size_t item_len); __printf(2, 3) void __rds_conn_error(struct rds_connection *conn, const char *, ...); #define rds_conn_error(conn, fmt...) \ __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); #define rds_conn_path_error(cp, fmt...) \ __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
static inline int rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) { return atomic_cmpxchg(&cp->cp_state, old, new) == old; }

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static inline int rds_conn_transition(struct rds_connection *conn, int old, int new) { WARN_ON(conn->c_trans->t_mp_capable); return rds_conn_path_transition(&conn->c_path[0], old, new); }

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static inline int rds_conn_path_state(struct rds_conn_path *cp) { return atomic_read(&cp->cp_state); }

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static inline int rds_conn_state(struct rds_connection *conn) { WARN_ON(conn->c_trans->t_mp_capable); return rds_conn_path_state(&conn->c_path[0]); }

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static inline int rds_conn_path_up(struct rds_conn_path *cp) { return atomic_read(&cp->cp_state) == RDS_CONN_UP; }

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static inline int rds_conn_up(struct rds_connection *conn) { WARN_ON(conn->c_trans->t_mp_capable); return rds_conn_path_up(&conn->c_path[0]); }

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static inline int rds_conn_path_connecting(struct rds_conn_path *cp) { return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; }

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Total23100.00%2100.00%


static inline int rds_conn_connecting(struct rds_connection *conn) { WARN_ON(conn->c_trans->t_mp_capable); return rds_conn_path_connecting(&conn->c_path[0]); }

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andy groverandy grover1957.58%133.33%
sowmini varadhansowmini varadhan1442.42%266.67%
Total33100.00%3100.00%

/* message.c */ struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); void rds_message_populate_header(struct rds_header *hdr, __be16 sport, __be16 dport, u64 seq); int rds_message_add_extension(struct rds_header *hdr, unsigned int type, const void *data, unsigned int len); int rds_message_next_extension(struct rds_header *hdr, unsigned int *pos, void *buf, unsigned int *buflen); int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); void rds_message_inc_free(struct rds_incoming *inc); void rds_message_addref(struct rds_message *rm); void rds_message_put(struct rds_message *rm); void rds_message_wait(struct rds_message *rm); void rds_message_unmapped(struct rds_message *rm);
static inline void rds_message_make_checksum(struct rds_header *hdr) { hdr->h_csum = 0; hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); }

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andy groverandy grover39100.00%1100.00%
Total39100.00%1100.00%


static inline int rds_message_verify_checksum(const struct rds_header *hdr) { return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; }

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andy groverandy grover38100.00%1100.00%
Total38100.00%1100.00%

/* page.c */ int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, gfp_t gfp); int rds_page_copy_user(struct page *page, unsigned long offset, void __user *ptr, unsigned long bytes, int to_user); #define rds_page_copy_to_user(page, offset, ptr, bytes) \ rds_page_copy_user(page, offset, ptr, bytes, 1) #define rds_page_copy_from_user(page, offset, ptr, bytes) \ rds_page_copy_user(page, offset, ptr, bytes, 0) void rds_page_exit(void); /* recv.c */ void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, __be32 saddr)