linux/drivers/scsi/cxgb3i/cxgb3i_offload.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1940 lines
50 KiB
C

/*
* 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);
}