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linux-sg2042/drivers/scsi/cxgb3i/cxgb3i_offload.c

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/*
* cxgb3i_offload.c: 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)
*/
#include <linux/if_vlan.h>
#include <linux/slab.h>
#include <linux/version.h>
#include "cxgb3_defs.h"
#include "cxgb3_ctl_defs.h"
#include "firmware_exports.h"
#include "cxgb3i_offload.h"
#include "cxgb3i_pdu.h"
#include "cxgb3i_ddp.h"
#ifdef __DEBUG_C3CN_CONN__
#define c3cn_conn_debug cxgb3i_log_debug
#else
#define c3cn_conn_debug(fmt...)
#endif
#ifdef __DEBUG_C3CN_TX__
#define c3cn_tx_debug cxgb3i_log_debug
#else
#define c3cn_tx_debug(fmt...)
#endif
#ifdef __DEBUG_C3CN_RX__
#define c3cn_rx_debug cxgb3i_log_debug
#else
#define c3cn_rx_debug(fmt...)
#endif
/*
* module parameters releated to offloaded iscsi connection
*/
static int cxgb3_rcv_win = 256 * 1024;
module_param(cxgb3_rcv_win, int, 0644);
MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)");
static int cxgb3_snd_win = 128 * 1024;
module_param(cxgb3_snd_win, int, 0644);
MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)");
static int cxgb3_rx_credit_thres = 10 * 1024;
module_param(cxgb3_rx_credit_thres, int, 0644);
MODULE_PARM_DESC(rx_credit_thres,
"RX credits return threshold in bytes (default=10KB)");
static unsigned int cxgb3_max_connect = 8 * 1024;
module_param(cxgb3_max_connect, uint, 0644);
MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)");
static unsigned int cxgb3_sport_base = 20000;
module_param(cxgb3_sport_base, uint, 0644);
MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)");
/*
* cxgb3i tcp connection data(per adapter) list
*/
static LIST_HEAD(cdata_list);
static DEFINE_RWLOCK(cdata_rwlock);
static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion);
static void c3cn_release_offload_resources(struct s3_conn *c3cn);
/*
* iscsi source port management
*
* Find a free source port in the port allocation map. We use a very simple
* rotor scheme to look for the next free port.
*
* If a source port has been specified make sure that it doesn't collide with
* our normal source port allocation map. If it's outside the range of our
* allocation/deallocation scheme just let them use it.
*
* If the source port is outside our allocation range, the caller is
* responsible for keeping track of their port usage.
*/
static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
{
unsigned int start;
int idx;
if (!cdata)
goto error_out;
if (c3cn->saddr.sin_port) {
cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n",
c3cn->saddr.sin_port);
return -EADDRINUSE;
}
spin_lock_bh(&cdata->lock);
start = idx = cdata->sport_next;
do {
if (++idx >= cxgb3_max_connect)
idx = 0;
if (!cdata->sport_conn[idx]) {
c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
cdata->sport_next = idx;
cdata->sport_conn[idx] = c3cn;
spin_unlock_bh(&cdata->lock);
c3cn_conn_debug("%s reserve port %u.\n",
cdata->cdev->name,
cxgb3_sport_base + idx);
return 0;
}
} while (idx != start);
spin_unlock_bh(&cdata->lock);
error_out:
return -EADDRNOTAVAIL;
}
static void c3cn_put_port(struct s3_conn *c3cn)
{
if (!c3cn->cdev)
return;
if (c3cn->saddr.sin_port) {
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
c3cn->saddr.sin_port = 0;
if (idx < 0 || idx >= cxgb3_max_connect)
return;
spin_lock_bh(&cdata->lock);
cdata->sport_conn[idx] = NULL;
spin_unlock_bh(&cdata->lock);
c3cn_conn_debug("%s, release port %u.\n",
cdata->cdev->name, cxgb3_sport_base + idx);
}
}
static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
__set_bit(flag, &c3cn->flags);
c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
__clear_bit(flag, &c3cn->flags);
c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
{
if (c3cn == NULL)
return 0;
return test_bit(flag, &c3cn->flags);
}
static void c3cn_set_state(struct s3_conn *c3cn, int state)
{
c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
c3cn->state = state;
}
static inline void c3cn_hold(struct s3_conn *c3cn)
{
atomic_inc(&c3cn->refcnt);
}
static inline void c3cn_put(struct s3_conn *c3cn)
{
if (atomic_dec_and_test(&c3cn->refcnt)) {
c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
kfree(c3cn);
}
}
static void c3cn_closed(struct s3_conn *c3cn)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn_put_port(c3cn);
c3cn_release_offload_resources(c3cn);
c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
cxgb3i_conn_closing(c3cn);
}
/*
* CPL (Chelsio Protocol Language) defines a message passing interface between
* the host driver and T3 asic.
* The section below implments CPLs that related to iscsi tcp connection
* open/close/abort and data send/receive.
*/
/*
* CPL connection active open request: host ->
*/
static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
{
int i = 0;
while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
++i;
return i;
}
static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
{
unsigned int idx;
struct dst_entry *dst = c3cn->dst_cache;
struct t3cdev *cdev = c3cn->cdev;
const struct t3c_data *td = T3C_DATA(cdev);
u16 advmss = dst_metric(dst, RTAX_ADVMSS);
if (advmss > pmtu - 40)
advmss = pmtu - 40;
if (advmss < td->mtus[0] - 40)
advmss = td->mtus[0] - 40;
idx = find_best_mtu(td, advmss + 40);
return idx;
}
static inline int compute_wscale(int win)
{
int wscale = 0;
while (wscale < 14 && (65535<<wscale) < win)
wscale++;
return wscale;
}
static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
{
int wscale = compute_wscale(cxgb3_rcv_win);
return V_KEEP_ALIVE(1) |
F_TCAM_BYPASS |
V_WND_SCALE(wscale) |
V_MSS_IDX(c3cn->mss_idx);
}
static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
{
return V_ULP_MODE(ULP_MODE_ISCSI) |
V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
}
static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
unsigned int atid, const struct l2t_entry *e)
{
struct cpl_act_open_req *req;
c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
skb->priority = CPL_PRIORITY_SETUP;
req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
req->local_port = c3cn->saddr.sin_port;
req->peer_port = c3cn->daddr.sin_port;
req->local_ip = c3cn->saddr.sin_addr.s_addr;
req->peer_ip = c3cn->daddr.sin_addr.s_addr;
req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) |
V_TX_CHANNEL(e->smt_idx));
req->opt0l = htonl(calc_opt0l(c3cn));
req->params = 0;
}
static void fail_act_open(struct s3_conn *c3cn, int errno)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->err = errno;
c3cn_closed(c3cn);
}
static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
{
struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
c3cn_hold(c3cn);
spin_lock_bh(&c3cn->lock);
if (c3cn->state == C3CN_STATE_CONNECTING)
fail_act_open(c3cn, -EHOSTUNREACH);
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
__kfree_skb(skb);
}
/*
* CPL connection close request: host ->
*
* Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
* the write queue (i.e., after any unsent txt data).
*/
static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
int flags)
{
skb_tcp_seq(skb) = c3cn->write_seq;
skb_flags(skb) = flags;
__skb_queue_tail(&c3cn->write_queue, skb);
}
static void send_close_req(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->cpl_close;
struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
unsigned int tid = c3cn->tid;
c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->cpl_close = NULL;
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
req->wr.wr_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
req->rsvd = htonl(c3cn->write_seq);
skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
if (c3cn->state != C3CN_STATE_CONNECTING)
c3cn_push_tx_frames(c3cn, 1);
}
/*
* CPL connection abort request: host ->
*
* Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
* for the same connection and also that we do not try to send a message
* after the connection has closed.
*/
static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
{
struct cpl_abort_req *req = cplhdr(skb);
c3cn_conn_debug("tdev 0x%p.\n", cdev);
req->cmd = CPL_ABORT_NO_RST;
cxgb3_ofld_send(cdev, skb);
}
static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
{
struct sk_buff *skb;
while ((skb = __skb_dequeue(&c3cn->write_queue)))
__kfree_skb(skb);
}
static void send_abort_req(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->cpl_abort_req;
struct cpl_abort_req *req;
unsigned int tid = c3cn->tid;
if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
!c3cn->cdev)
return;
c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
/* Purge the send queue so we don't send anything after an abort. */
c3cn_purge_write_queue(c3cn);
c3cn->cpl_abort_req = NULL;
req = (struct cpl_abort_req *)skb->head;
skb->priority = CPL_PRIORITY_DATA;
set_arp_failure_handler(skb, abort_arp_failure);
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
req->wr.wr_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
req->rsvd0 = htonl(c3cn->snd_nxt);
req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT);
req->cmd = CPL_ABORT_SEND_RST;
l2t_send(c3cn->cdev, skb, c3cn->l2t);
}
/*
* CPL connection abort reply: host ->
*
* Send an ABORT_RPL message in response of the ABORT_REQ received.
*/
static void send_abort_rpl(struct s3_conn *c3cn, int rst_status)
{
struct sk_buff *skb = c3cn->cpl_abort_rpl;
struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
c3cn->cpl_abort_rpl = NULL;
skb->priority = CPL_PRIORITY_DATA;
rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid));
OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid));
rpl->cmd = rst_status;
cxgb3_ofld_send(c3cn->cdev, skb);
}
/*
* CPL connection rx data ack: host ->
* Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
* credits sent.
*/
static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
{
struct sk_buff *skb;
struct cpl_rx_data_ack *req;
skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
if (!skb)
return 0;
req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req));
req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid));
req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
skb->priority = CPL_PRIORITY_ACK;
cxgb3_ofld_send(c3cn->cdev, skb);
return credits;
}
/*
* CPL connection tx data: host ->
*
* Send iscsi PDU via TX_DATA CPL message. Returns the number of
* credits sent.
* Each TX_DATA consumes work request credit (wrs), so we need to keep track of
* how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
*/
/*
* For ULP connections HW may inserts digest bytes into the pdu. Those digest
* bytes are not sent by the host but are part of the TCP payload and therefore
* consume TCP sequence space.
*/
static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
static inline unsigned int ulp_extra_len(const struct sk_buff *skb)
{
return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
}
static unsigned int wrlen __read_mostly;
/*
* The number of WRs needed for an skb depends on the number of fragments
* in the skb and whether it has any payload in its main body. This maps the
* length of the gather list represented by an skb into the # of necessary WRs.
* The extra two fragments are for iscsi bhs and payload padding.
*/
#define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2)
static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
static void s3_init_wr_tab(unsigned int wr_len)
{
int i;
if (skb_wrs[1]) /* already initialized */
return;
for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
int sgl_len = (3 * i) / 2 + (i & 1);
sgl_len += 3;
skb_wrs[i] = (sgl_len <= wr_len
? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
}
wrlen = wr_len * 8;
}
static inline void reset_wr_list(struct s3_conn *c3cn)
{
c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL;
}
/*
* Add a WR to a connections's list of pending WRs. This is a singly-linked
* list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head
* and the tail in wr_pending_tail.
*/
static inline void enqueue_wr(struct s3_conn *c3cn,
struct sk_buff *skb)
{
skb_tx_wr_next(skb) = NULL;
/*
* We want to take an extra reference since both us and the driver
* need to free the packet before it's really freed. We know there's
* just one user currently so we use atomic_set rather than skb_get
* to avoid the atomic op.
*/
atomic_set(&skb->users, 2);
if (!c3cn->wr_pending_head)
c3cn->wr_pending_head = skb;
else
skb_tx_wr_next(c3cn->wr_pending_tail) = skb;
c3cn->wr_pending_tail = skb;
}
static int count_pending_wrs(struct s3_conn *c3cn)
{
int n = 0;
const struct sk_buff *skb = c3cn->wr_pending_head;
while (skb) {
n += skb->csum;
skb = skb_tx_wr_next(skb);
}
return n;
}
static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
{
return c3cn->wr_pending_head;
}
static inline void free_wr_skb(struct sk_buff *skb)
{
kfree_skb(skb);
}
static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
{
struct sk_buff *skb = c3cn->wr_pending_head;
if (likely(skb)) {
/* Don't bother clearing the tail */
c3cn->wr_pending_head = skb_tx_wr_next(skb);
skb_tx_wr_next(skb) = NULL;
}
return skb;
}
static void purge_wr_queue(struct s3_conn *c3cn)
{
struct sk_buff *skb;
while ((skb = dequeue_wr(c3cn)) != NULL)
free_wr_skb(skb);
}
static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb,
int len, int req_completion)
{
struct tx_data_wr *req;
skb_reset_transport_header(skb);
req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
(req_completion ? F_WR_COMPL : 0));
req->wr_lo = htonl(V_WR_TID(c3cn->tid));
req->sndseq = htonl(c3cn->snd_nxt);
/* len includes the length of any HW ULP additions */
req->len = htonl(len);
req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx));
/* V_TX_ULP_SUBMODE sets both the mode and submode */
req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) |
V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1)));
if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) {
req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
V_TX_CPU_IDX(c3cn->qset));
/* Sendbuffer is in units of 32KB. */
req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
}
}
/**
* c3cn_push_tx_frames -- start transmit
* @c3cn: the offloaded connection
* @req_completion: request wr_ack or not
*
* Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
* connection's send queue and sends them on to T3. Must be called with the
* connection's lock held. Returns the amount of send buffer space that was
* freed as a result of sending queued data to T3.
*/
static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb)
{
kfree_skb(skb);
}
static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion)
{
int total_size = 0;
struct sk_buff *skb;
struct t3cdev *cdev;
struct cxgb3i_sdev_data *cdata;
if (unlikely(c3cn->state == C3CN_STATE_CONNECTING ||
c3cn->state == C3CN_STATE_CLOSE_WAIT_1 ||
c3cn->state >= C3CN_STATE_ABORTING)) {
c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n",
c3cn, c3cn->state);
return 0;
}
cdev = c3cn->cdev;
cdata = CXGB3_SDEV_DATA(cdev);
while (c3cn->wr_avail
&& (skb = skb_peek(&c3cn->write_queue)) != NULL) {
int len = skb->len; /* length before skb_push */
int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
int wrs_needed = skb_wrs[frags];
if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
wrs_needed = 1;
WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
if (c3cn->wr_avail < wrs_needed) {
c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, "
"wr %d < %u.\n",
c3cn, skb->len, skb->data_len, frags,
wrs_needed, c3cn->wr_avail);
break;
}
__skb_unlink(skb, &c3cn->write_queue);
skb->priority = CPL_PRIORITY_DATA;
skb->csum = wrs_needed; /* remember this until the WR_ACK */
c3cn->wr_avail -= wrs_needed;
c3cn->wr_unacked += wrs_needed;
enqueue_wr(c3cn, skb);
c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, "
"wr %d, left %u, unack %u.\n",
c3cn, skb->len, skb->data_len, frags,
wrs_needed, c3cn->wr_avail, c3cn->wr_unacked);
if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) {
if ((req_completion &&
c3cn->wr_unacked == wrs_needed) ||
(skb_flags(skb) & C3CB_FLAG_COMPL) ||
c3cn->wr_unacked >= c3cn->wr_max / 2) {
req_completion = 1;
c3cn->wr_unacked = 0;
}
len += ulp_extra_len(skb);
make_tx_data_wr(c3cn, skb, len, req_completion);
c3cn->snd_nxt += len;
skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR;
}
total_size += skb->truesize;
set_arp_failure_handler(skb, arp_failure_discard);
l2t_send(cdev, skb, c3cn->l2t);
}
return total_size;
}
/*
* process_cpl_msg: -> host
* Top-level CPL message processing used by most CPL messages that
* pertain to connections.
*/
static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
struct sk_buff *),
struct s3_conn *c3cn,
struct sk_buff *skb)
{
spin_lock_bh(&c3cn->lock);
fn(c3cn, skb);
spin_unlock_bh(&c3cn->lock);
}
/*
* process_cpl_msg_ref: -> host
* Similar to process_cpl_msg() but takes an extra connection reference around
* the call to the handler. Should be used if the handler may drop a
* connection reference.
*/
static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *,
struct sk_buff *),
struct s3_conn *c3cn,
struct sk_buff *skb)
{
c3cn_hold(c3cn);
process_cpl_msg(fn, c3cn, skb);
c3cn_put(c3cn);
}
/*
* Process a CPL_ACT_ESTABLISH message: -> host
* Updates connection state from an active establish CPL message. Runs with
* the connection lock held.
*/
static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid)
{
struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid);
if (c3cn)
c3cn_put(c3cn);
}
static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
unsigned int opt)
{
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
/*
* Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
* pass through opt0.
*/
if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10))
c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10);
dst_confirm(c3cn->dst_cache);
smp_mb();
c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
}
static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_act_establish *req = cplhdr(skb);
u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
c3cn->tid, c3cn->state);
c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
__kfree_skb(skb);
if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
/* upper layer has requested closing */
send_abort_req(c3cn);
else {
if (skb_queue_len(&c3cn->write_queue))
c3cn_push_tx_frames(c3cn, 1);
cxgb3i_conn_tx_open(c3cn);
}
}
static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
void *ctx)
{
struct cpl_act_establish *req = cplhdr(skb);
unsigned int tid = GET_TID(req);
unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
struct s3_conn *c3cn = ctx;
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
tid, c3cn, c3cn->state, c3cn->flags);
c3cn->tid = tid;
c3cn_hold(c3cn);
cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
s3_free_atid(cdev, atid);
c3cn->qset = G_QNUM(ntohl(skb->csum));
process_cpl_msg(process_act_establish, c3cn, skb);
return 0;
}
/*
* Process a CPL_ACT_OPEN_RPL message: -> host
* Handle active open failures.
*/
static int act_open_rpl_status_to_errno(int status)
{
switch (status) {
case CPL_ERR_CONN_RESET:
return -ECONNREFUSED;
case CPL_ERR_ARP_MISS:
return -EHOSTUNREACH;
case CPL_ERR_CONN_TIMEDOUT:
return -ETIMEDOUT;
case CPL_ERR_TCAM_FULL:
return -ENOMEM;
case CPL_ERR_CONN_EXIST:
cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n");
return -EADDRINUSE;
default:
return -EIO;
}
}
static void act_open_retry_timer(unsigned long data)
{
struct sk_buff *skb;
struct s3_conn *c3cn = (struct s3_conn *)data;
c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
spin_lock_bh(&c3cn->lock);
skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
if (!skb)
fail_act_open(c3cn, -ENOMEM);
else {
skb->sk = (struct sock *)c3cn;
set_arp_failure_handler(skb, act_open_req_arp_failure);
make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
l2t_send(c3cn->cdev, skb, c3cn->l2t);
}
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
}
static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_act_open_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (rpl->status == CPL_ERR_CONN_EXIST &&
c3cn->retry_timer.function != act_open_retry_timer) {
c3cn->retry_timer.function = act_open_retry_timer;
if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2))
c3cn_hold(c3cn);
} else
fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
__kfree_skb(skb);
}
static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
struct cpl_act_open_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
rpl->status, c3cn, c3cn->state, c3cn->flags);
if (rpl->status != CPL_ERR_TCAM_FULL &&
rpl->status != CPL_ERR_CONN_EXIST &&
rpl->status != CPL_ERR_ARP_MISS)
cxgb3_queue_tid_release(cdev, GET_TID(rpl));
process_cpl_msg_ref(process_act_open_rpl, c3cn, skb);
return 0;
}
/*
* Process PEER_CLOSE CPL messages: -> host
* Handle peer FIN.
*/
static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
goto out;
switch (c3cn->state) {
case C3CN_STATE_ESTABLISHED:
c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE);
break;
case C3CN_STATE_ACTIVE_CLOSE:
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
break;
case C3CN_STATE_CLOSE_WAIT_1:
c3cn_closed(c3cn);
break;
case C3CN_STATE_ABORTING:
break;
default:
cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n",
c3cn->cdev->name, c3cn->tid, c3cn->state);
}
cxgb3i_conn_closing(c3cn);
out:
__kfree_skb(skb);
}
static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
process_cpl_msg_ref(process_peer_close, c3cn, skb);
return 0;
}
/*
* Process CLOSE_CONN_RPL CPL message: -> host
* Process a peer ACK to our FIN.
*/
static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_close_con_rpl *rpl = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
goto out;
switch (c3cn->state) {
case C3CN_STATE_ACTIVE_CLOSE:
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1);
break;
case C3CN_STATE_CLOSE_WAIT_1:
case C3CN_STATE_CLOSE_WAIT_2:
c3cn_closed(c3cn);
break;
case C3CN_STATE_ABORTING:
break;
default:
cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n",
c3cn->cdev->name, c3cn->tid, c3cn->state);
}
out:
kfree_skb(skb);
}
static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
void *ctx)
{
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
return 0;
}
/*
* Process ABORT_REQ_RSS CPL message: -> host
* Process abort requests. If we are waiting for an ABORT_RPL we ignore this
* request except that we need to reply to it.
*/
static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason,
int *need_rst)
{
switch (abort_reason) {
case CPL_ERR_BAD_SYN: /* fall through */
case CPL_ERR_CONN_RESET:
return c3cn->state > C3CN_STATE_ESTABLISHED ?
-EPIPE : -ECONNRESET;
case CPL_ERR_XMIT_TIMEDOUT:
case CPL_ERR_PERSIST_TIMEDOUT:
case CPL_ERR_FINWAIT2_TIMEDOUT:
case CPL_ERR_KEEPALIVE_TIMEDOUT:
return -ETIMEDOUT;
default:
return -EIO;
}
}
static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
{
int rst_status = CPL_ABORT_NO_RST;
const struct cpl_abort_req_rss *req = cplhdr(skb);
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
__kfree_skb(skb);
return;
}
c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD);
send_abort_rpl(c3cn, rst_status);
if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
c3cn->err =
abort_status_to_errno(c3cn, req->status, &rst_status);
c3cn_closed(c3cn);
}
}
static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
const struct cpl_abort_req_rss *req = cplhdr(skb);
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
__kfree_skb(skb);
return 0;
}
process_cpl_msg_ref(process_abort_req, c3cn, skb);
return 0;
}
/*
* Process ABORT_RPL_RSS CPL message: -> host
* Process abort replies. We only process these messages if we anticipate
* them as the coordination between SW and HW in this area is somewhat lacking
* and sometimes we get ABORT_RPLs after we are done with the connection that
* originated the ABORT_REQ.
*/
static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD))
c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD);
else {
c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD);
c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING);
if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD))
cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n",
c3cn->cdev->name, c3cn->tid);
c3cn_closed(c3cn);
}
}
__kfree_skb(skb);
}
static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
struct s3_conn *c3cn = ctx;
c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n",
rpl->status, c3cn, c3cn ? c3cn->state : 0,
c3cn ? c3cn->flags : 0UL);
/*
* Ignore replies to post-close aborts indicating that the abort was
* requested too late. These connections are terminated when we get
* PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
* arrives the TID is either no longer used or it has been recycled.
*/
if (rpl->status == CPL_ERR_ABORT_FAILED)
goto discard;
/*
* Sometimes we've already closed the connection, e.g., a post-close
* abort races with ABORT_REQ_RSS, the latter frees the connection
* expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
* but FW turns the ABORT_REQ into a regular one and so we get
* ABORT_RPL_RSS with status 0 and no connection.
*/
if (!c3cn)
goto discard;
process_cpl_msg_ref(process_abort_rpl, c3cn, skb);
return 0;
discard:
__kfree_skb(skb);
return 0;
}
/*
* Process RX_ISCSI_HDR CPL message: -> host
* Handle received PDUs, the payload could be DDP'ed. If not, the payload
* follow after the bhs.
*/
static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
struct cpl_iscsi_hdr_norss data_cpl;
struct cpl_rx_data_ddp_norss ddp_cpl;
unsigned int hdr_len, data_len, status;
unsigned int len;
int err;
if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
if (c3cn->state != C3CN_STATE_ABORTING)
send_abort_req(c3cn);
__kfree_skb(skb);
return;
}
skb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
skb_flags(skb) = 0;
skb_reset_transport_header(skb);
__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
len = hdr_len = ntohs(hdr_cpl->len);
/* msg coalesce is off or not enough data received */
if (skb->len <= hdr_len) {
cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
c3cn->cdev->name, c3cn->tid,
skb->len, hdr_len);
goto abort_conn;
}
err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
sizeof(ddp_cpl));
if (err < 0)
goto abort_conn;
skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY;
skb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
status = ntohl(ddp_cpl.ddp_status);
c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n",
skb, skb->len, skb_rx_pdulen(skb), status);
if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR;
if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR;
if (status & (1 << RX_DDP_STATUS_PAD_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR;
if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
if (err < 0)
goto abort_conn;
data_len = ntohs(data_cpl.len);
len += sizeof(data_cpl) + data_len;
} else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT))
skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED;
c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb);
__pskb_trim(skb, len);
__skb_queue_tail(&c3cn->receive_queue, skb);
cxgb3i_conn_pdu_ready(c3cn);
return;
abort_conn:
send_abort_req(c3cn);
__kfree_skb(skb);
}
static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
return 0;
}
/*
* Process TX_DATA_ACK CPL messages: -> host
* Process an acknowledgment of WR completion. Advance snd_una and send the
* next batch of work requests from the write queue.
*/
static void check_wr_invariants(struct s3_conn *c3cn)
{
int pending = count_pending_wrs(c3cn);
if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max))
cxgb3i_log_error("TID %u: credit imbalance: avail %u, "
"pending %u, total should be %u\n",
c3cn->tid, c3cn->wr_avail, pending,
c3cn->wr_max);
}
static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct cpl_wr_ack *hdr = cplhdr(skb);
unsigned int credits = ntohs(hdr->credits);
u32 snd_una = ntohl(hdr->snd_una);
c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n",
credits, c3cn->wr_avail, c3cn->wr_unacked,
c3cn->tid, c3cn->state);
c3cn->wr_avail += credits;
if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail)
c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail;
while (credits) {
struct sk_buff *p = peek_wr(c3cn);
if (unlikely(!p)) {
cxgb3i_log_error("%u WR_ACK credits for TID %u with "
"nothing pending, state %u\n",
credits, c3cn->tid, c3cn->state);
break;
}
if (unlikely(credits < p->csum)) {
struct tx_data_wr *w = cplhdr(p);
cxgb3i_log_error("TID %u got %u WR credits need %u, "
"len %u, main body %u, frags %u, "
"seq # %u, ACK una %u, ACK nxt %u, "
"WR_AVAIL %u, WRs pending %u\n",
c3cn->tid, credits, p->csum, p->len,
p->len - p->data_len,
skb_shinfo(p)->nr_frags,
ntohl(w->sndseq), snd_una,
ntohl(hdr->snd_nxt), c3cn->wr_avail,
count_pending_wrs(c3cn) - credits);
p->csum -= credits;
break;
} else {
dequeue_wr(c3cn);
credits -= p->csum;
free_wr_skb(p);
}
}
check_wr_invariants(c3cn);
if (unlikely(before(snd_una, c3cn->snd_una))) {
cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK "
"snd_una %u\n",
c3cn->tid, snd_una, c3cn->snd_una);
goto out_free;
}
if (c3cn->snd_una != snd_una) {
c3cn->snd_una = snd_una;
dst_confirm(c3cn->dst_cache);
}
if (skb_queue_len(&c3cn->write_queue)) {
if (c3cn_push_tx_frames(c3cn, 0))
cxgb3i_conn_tx_open(c3cn);
} else
cxgb3i_conn_tx_open(c3cn);
out_free:
__kfree_skb(skb);
}
static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
struct s3_conn *c3cn = ctx;
process_cpl_msg(process_wr_ack, c3cn, skb);
return 0;
}
/*
* for each connection, pre-allocate skbs needed for close/abort requests. So
* that we can service the request right away.
*/
static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
{
if (c3cn->cpl_close)
kfree_skb(c3cn->cpl_close);
if (c3cn->cpl_abort_req)
kfree_skb(c3cn->cpl_abort_req);
if (c3cn->cpl_abort_rpl)
kfree_skb(c3cn->cpl_abort_rpl);
}
static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn)
{
c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req),
GFP_KERNEL);
if (!c3cn->cpl_close)
return -ENOMEM;
skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req));
c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req),
GFP_KERNEL);
if (!c3cn->cpl_abort_req)
goto free_cpl_skbs;
skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req));
c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl),
GFP_KERNEL);
if (!c3cn->cpl_abort_rpl)
goto free_cpl_skbs;
skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl));
return 0;
free_cpl_skbs:
c3cn_free_cpl_skbs(c3cn);
return -ENOMEM;
}
/**
* c3cn_release_offload_resources - release offload resource
* @c3cn: the offloaded iscsi tcp connection.
* Release resources held by an offload connection (TID, L2T entry, etc.)
*/
static void c3cn_release_offload_resources(struct s3_conn *c3cn)
{
struct t3cdev *cdev = c3cn->cdev;
unsigned int tid = c3cn->tid;
c3cn->qset = 0;
c3cn_free_cpl_skbs(c3cn);
if (c3cn->wr_avail != c3cn->wr_max) {
purge_wr_queue(c3cn);
reset_wr_list(c3cn);
}
if (cdev) {
if (c3cn->l2t) {
l2t_release(L2DATA(cdev), c3cn->l2t);
c3cn->l2t = NULL;
}
if (c3cn->state == C3CN_STATE_CONNECTING)
/* we have ATID */
s3_free_atid(cdev, tid);
else {
/* we have TID */
cxgb3_remove_tid(cdev, (void *)c3cn, tid);
c3cn_put(c3cn);
}
}
c3cn->dst_cache = NULL;
c3cn->cdev = NULL;
}
/**
* cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
* returns the s3_conn structure allocated.
*/
struct s3_conn *cxgb3i_c3cn_create(void)
{
struct s3_conn *c3cn;
c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
if (!c3cn)
return NULL;
/* pre-allocate close/abort cpl, so we don't need to wait for memory
when close/abort is requested. */
if (c3cn_alloc_cpl_skbs(c3cn) < 0)
goto free_c3cn;
c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
c3cn->flags = 0;
spin_lock_init(&c3cn->lock);
atomic_set(&c3cn->refcnt, 1);
skb_queue_head_init(&c3cn->receive_queue);
skb_queue_head_init(&c3cn->write_queue);
setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn);
rwlock_init(&c3cn->callback_lock);
return c3cn;
free_c3cn:
kfree(c3cn);
return NULL;
}
static void c3cn_active_close(struct s3_conn *c3cn)
{
int data_lost;
int close_req = 0;
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
dst_confirm(c3cn->dst_cache);
c3cn_hold(c3cn);
spin_lock_bh(&c3cn->lock);
data_lost = skb_queue_len(&c3cn->receive_queue);
__skb_queue_purge(&c3cn->receive_queue);
switch (c3cn->state) {
case C3CN_STATE_CLOSED:
case C3CN_STATE_ACTIVE_CLOSE:
case C3CN_STATE_CLOSE_WAIT_1:
case C3CN_STATE_CLOSE_WAIT_2:
case C3CN_STATE_ABORTING:
/* nothing need to be done */
break;
case C3CN_STATE_CONNECTING:
/* defer until cpl_act_open_rpl or cpl_act_establish */
c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
break;
case C3CN_STATE_ESTABLISHED:
close_req = 1;
c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE);
break;
case C3CN_STATE_PASSIVE_CLOSE:
close_req = 1;
c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
break;
}
if (close_req) {
if (data_lost)
/* Unread data was tossed, zap the connection. */
send_abort_req(c3cn);
else
send_close_req(c3cn);
}
spin_unlock_bh(&c3cn->lock);
c3cn_put(c3cn);
}
/**
* cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
* resource held
* @c3cn: the iscsi tcp connection
*/
void cxgb3i_c3cn_release(struct s3_conn *c3cn)
{
c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
if (unlikely(c3cn->state == C3CN_STATE_CONNECTING))
c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
else if (likely(c3cn->state != C3CN_STATE_CLOSED))
c3cn_active_close(c3cn);
c3cn_put(c3cn);
}
static int is_cxgb3_dev(struct net_device *dev)
{
struct cxgb3i_sdev_data *cdata;
struct net_device *ndev = dev;
if (dev->priv_flags & IFF_802_1Q_VLAN)
ndev = vlan_dev_real_dev(dev);
write_lock(&cdata_rwlock);
list_for_each_entry(cdata, &cdata_list, list) {
struct adap_ports *ports = &cdata->ports;
int i;
for (i = 0; i < ports->nports; i++)
if (ndev == ports->lldevs[i]) {
write_unlock(&cdata_rwlock);
return 1;
}
}
write_unlock(&cdata_rwlock);
return 0;
}
/**
* cxgb3_egress_dev - return the cxgb3 egress device
* @root_dev: the root device anchoring the search
* @c3cn: the connection used to determine egress port in bonding mode
* @context: in bonding mode, indicates a connection set up or failover
*
* Return egress device or NULL if the egress device isn't one of our ports.
*/
static struct net_device *cxgb3_egress_dev(struct net_device *root_dev,
struct s3_conn *c3cn,
int context)
{
while (root_dev) {
if (root_dev->priv_flags & IFF_802_1Q_VLAN)
root_dev = vlan_dev_real_dev(root_dev);
else if (is_cxgb3_dev(root_dev))
return root_dev;
else
return NULL;
}
return NULL;
}
static struct rtable *find_route(struct net_device *dev,
__be32 saddr, __be32 daddr,
__be16 sport, __be16 dport)
{
struct rtable *rt;
struct flowi fl = {
.oif = dev ? dev->ifindex : 0,
.nl_u = {
.ip4_u = {
.daddr = daddr,
.saddr = saddr,
.tos = 0 } },
.proto = IPPROTO_TCP,
.uli_u = {
.ports = {
.sport = sport,
.dport = dport } } };
if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
return NULL;
return rt;
}
/*
* Assign offload parameters to some connection fields.
*/
static void init_offload_conn(struct s3_conn *c3cn,
struct t3cdev *cdev,
struct dst_entry *dst)
{
BUG_ON(c3cn->cdev != cdev);
c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1;
c3cn->wr_unacked = 0;
c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
reset_wr_list(c3cn);
}
static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev)
{
struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
struct t3cdev *cdev = cdata->cdev;
struct dst_entry *dst = c3cn->dst_cache;
struct sk_buff *skb;
c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
/*
* Initialize connection data. Note that the flags and ULP mode are
* initialized higher up ...
*/
c3cn->dev = dev;
c3cn->cdev = cdev;
c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn);
if (c3cn->tid < 0)
goto out_err;
c3cn->qset = 0;
c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev);
if (!c3cn->l2t)
goto free_tid;
skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL);
if (!skb)
goto free_l2t;
skb->sk = (struct sock *)c3cn;
set_arp_failure_handler(skb, act_open_req_arp_failure);
c3cn_hold(c3cn);
init_offload_conn(c3cn, cdev, dst);
c3cn->err = 0;
make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
l2t_send(cdev, skb, c3cn->l2t);
return 0;
free_l2t:
l2t_release(L2DATA(cdev), c3cn->l2t);
free_tid:
s3_free_atid(cdev, c3cn->tid);
c3cn->tid = 0;
out_err:
return -EINVAL;
}
/**
* cxgb3i_find_dev - find the interface associated with the given address
* @ipaddr: ip address
*/
static struct net_device *
cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr)
{
struct flowi fl;
int err;
struct rtable *rt;
memset(&fl, 0, sizeof(fl));
fl.nl_u.ip4_u.daddr = ipaddr;
err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl);
if (!err)
return (&rt->u.dst)->dev;
return NULL;
}
/**
* cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
* @c3cn: the iscsi tcp connection
* @usin: destination address
*
* return 0 if active open request is sent, < 0 otherwise.
*/
int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
struct sockaddr_in *usin)
{
struct rtable *rt;
struct cxgb3i_sdev_data *cdata;
struct t3cdev *cdev;
__be32 sipv4;
struct net_device *dstdev;
int err;
c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev);
if (usin->sin_family != AF_INET)
return -EAFNOSUPPORT;
c3cn->daddr.sin_port = usin->sin_port;
c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr);
if (!dstdev || !is_cxgb3_dev(dstdev))
return -ENETUNREACH;
if (dstdev->priv_flags & IFF_802_1Q_VLAN)
dev = dstdev;
rt = find_route(dev, c3cn->saddr.sin_addr.s_addr,
c3cn->daddr.sin_addr.s_addr,
c3cn->saddr.sin_port,
c3cn->daddr.sin_port);
if (rt == NULL) {
c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n",
c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port),
dev ? dev->name : "any");
return -ENETUNREACH;
}
if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n",
c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port),
dev ? dev->name : "any");
ip_rt_put(rt);
return -ENETUNREACH;
}
if (!c3cn->saddr.sin_addr.s_addr)
c3cn->saddr.sin_addr.s_addr = rt->rt_src;
/* now commit destination to connection */
c3cn->dst_cache = &rt->u.dst;
/* try to establish an offloaded connection */
dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0);
if (dev == NULL) {
c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn);
return -ENETUNREACH;
}
cdata = NDEV2CDATA(dev);
cdev = cdata->cdev;
/* get a source port if one hasn't been provided */
err = c3cn_get_port(c3cn, cdata);
if (err)
return err;
c3cn_conn_debug("c3cn 0x%p get port %u.\n",
c3cn, ntohs(c3cn->saddr.sin_port));
sipv4 = cxgb3i_get_private_ipv4addr(dev);
if (!sipv4) {
c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn);
sipv4 = c3cn->saddr.sin_addr.s_addr;
cxgb3i_set_private_ipv4addr(dev, sipv4);
} else
c3cn->saddr.sin_addr.s_addr = sipv4;
c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n",
c3cn,
&c3cn->saddr.sin_addr.s_addr,
ntohs(c3cn->saddr.sin_port),
&c3cn->daddr.sin_addr.s_addr,
ntohs(c3cn->daddr.sin_port));
c3cn_set_state(c3cn, C3CN_STATE_CONNECTING);
if (!initiate_act_open(c3cn, dev))
return 0;
/*
* If we get here, we don't have an offload connection so simply
* return a failure.
*/
err = -ENOTSUPP;
/*
* This trashes the connection and releases the local port,
* if necessary.
*/
c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn);
c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
ip_rt_put(rt);
c3cn_put_port(c3cn);
return err;
}
/**
* cxgb3i_c3cn_rx_credits - ack received tcp data.
* @c3cn: iscsi tcp connection
* @copied: # of bytes processed
*
* Called after some received data has been read. It returns RX credits
* to the HW for the amount of data processed.
*/
void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
{
struct t3cdev *cdev;
int must_send;
u32 credits, dack = 0;
if (c3cn->state != C3CN_STATE_ESTABLISHED)
return;
credits = c3cn->copied_seq - c3cn->rcv_wup;
if (unlikely(!credits))
return;
cdev = c3cn->cdev;
if (unlikely(cxgb3_rx_credit_thres == 0))
return;
dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
/*
* For coalescing to work effectively ensure the receive window has
* at least 16KB left.
*/
must_send = credits + 16384 >= cxgb3_rcv_win;
if (must_send || credits >= cxgb3_rx_credit_thres)
c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack);
}
/**
* cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus
* @c3cn: iscsi tcp connection
* @skb: skb contains the iscsi pdu
*
* Add a list of skbs to a connection send queue. The skbs must comply with
* the max size limit of the device and have a headroom of at least
* TX_HEADER_LEN bytes.
* Return # of bytes queued.
*/
int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
{
struct sk_buff *next;
int err, copied = 0;
spin_lock_bh(&c3cn->lock);
if (c3cn->state != C3CN_STATE_ESTABLISHED) {
c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n",
c3cn, c3cn->state);
err = -EAGAIN;
goto out_err;
}
if (c3cn->err) {
c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
err = -EPIPE;
goto out_err;
}
if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) {
c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n",
c3cn, c3cn->write_seq, c3cn->snd_una,
cxgb3_snd_win);
err = -ENOBUFS;
goto out_err;
}
while (skb) {
int frags = skb_shinfo(skb)->nr_frags +
(skb->len != skb->data_len);
if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
err = -EINVAL;
goto out_err;
}
if (frags >= SKB_WR_LIST_SIZE) {
cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n",
c3cn, skb_shinfo(skb)->nr_frags,
skb->len, skb->data_len);
err = -EINVAL;
goto out_err;
}
next = skb->next;
skb->next = NULL;
skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR);
copied += skb->len;
c3cn->write_seq += skb->len + ulp_extra_len(skb);
skb = next;
}
done:
if (likely(skb_queue_len(&c3cn->write_queue)))
c3cn_push_tx_frames(c3cn, 1);
spin_unlock_bh(&c3cn->lock);
return copied;
out_err:
if (copied == 0 && err == -EPIPE)
copied = c3cn->err ? c3cn->err : -EPIPE;
else
copied = err;
goto done;
}
static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
{
struct adap_ports *ports = &cdata->ports;
struct s3_conn *c3cn;
int i;
for (i = 0; i < cxgb3_max_connect; i++) {
if (cdata->sport_conn[i]) {
c3cn = cdata->sport_conn[i];
cdata->sport_conn[i] = NULL;
spin_lock_bh(&c3cn->lock);
c3cn->cdev = NULL;
c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN);
c3cn_closed(c3cn);
spin_unlock_bh(&c3cn->lock);
}
}
for (i = 0; i < ports->nports; i++)
NDEV2CDATA(ports->lldevs[i]) = NULL;
cxgb3i_free_big_mem(cdata);
}
void cxgb3i_sdev_cleanup(void)
{
struct cxgb3i_sdev_data *cdata;
write_lock(&cdata_rwlock);
list_for_each_entry(cdata, &cdata_list, list) {
list_del(&cdata->list);
sdev_data_cleanup(cdata);
}
write_unlock(&cdata_rwlock);
}
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
{
cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish;
cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl;
cpl_handlers[CPL_PEER_CLOSE] = do_peer_close;
cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req;
cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl;
cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl;
cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack;
cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr;
if (cxgb3_max_connect > CXGB3I_MAX_CONN)
cxgb3_max_connect = CXGB3I_MAX_CONN;
return 0;
}
/**
* cxgb3i_sdev_add - allocate and initialize resources for each adapter found
* @cdev: t3cdev adapter
* @client: cxgb3 driver client
*/
void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
{
struct cxgb3i_sdev_data *cdata;
struct ofld_page_info rx_page_info;
unsigned int wr_len;
int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *);
int i;
cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
if (!cdata) {
cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n",
cdev, mapsize);
return;
}
if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n",
cdev);
goto free_cdata;
}
s3_init_wr_tab(wr_len);
spin_lock_init(&cdata->lock);
INIT_LIST_HEAD(&cdata->list);
cdata->cdev = cdev;
cdata->client = client;
for (i = 0; i < cdata->ports.nports; i++)
NDEV2CDATA(cdata->ports.lldevs[i]) = cdata;
write_lock(&cdata_rwlock);
list_add_tail(&cdata->list, &cdata_list);
write_unlock(&cdata_rwlock);
cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev);
return;
free_cdata:
cxgb3i_free_big_mem(cdata);
}
/**
* cxgb3i_sdev_remove - free the allocated resources for the adapter
* @cdev: t3cdev adapter
*/
void cxgb3i_sdev_remove(struct t3cdev *cdev)
{
struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev);
write_lock(&cdata_rwlock);
list_del(&cdata->list);
write_unlock(&cdata_rwlock);
sdev_data_cleanup(cdata);
}
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