[PATCH 2/3 2.6.29] cxgb3i -- get rid of GFP_NOFAIL
From: Karen Xie <kxie@xxxxxxxxxxx>
- get rid of GFP_NOFAIL in memory allocation calls
- move the port map to be per-adapter.
- fixed maximum number of skb frag calculations to be based on the sector size
instead of page size.
- grouped related code together in functional blocks.
- added more connection states to better tracking the state transitions.
- added more comments
Signed-off-by: Karen Xie <kxie@xxxxxxxxxxx>
---
drivers/scsi/cxgb3i/cxgb3i.h | 2
drivers/scsi/cxgb3i/cxgb3i_init.c | 2
drivers/scsi/cxgb3i/cxgb3i_iscsi.c | 4
drivers/scsi/cxgb3i/cxgb3i_offload.c | 2549 ++++++++++++++++------------------
drivers/scsi/cxgb3i/cxgb3i_offload.h | 247 ++-
5 files changed, 1301 insertions(+), 1503 deletions(-)
diff --git a/drivers/scsi/cxgb3i/cxgb3i.h b/drivers/scsi/cxgb3i/cxgb3i.h
index 1c2301e..2d541a5 100644
--- a/drivers/scsi/cxgb3i/cxgb3i.h
+++ b/drivers/scsi/cxgb3i/cxgb3i.h
@@ -86,7 +86,7 @@ struct cxgb3i_adapter {
* struct cxgb3i_conn - cxgb3i iscsi connection
*
* @listhead: list head to link elements
- * @conn: pointer to iscsi_endpoint structure
+ * @cep: pointer to iscsi_endpoint structure
* @conn: pointer to iscsi_conn structure
* @hba: pointer to the hba this conn. is going through
* @task_idx_bits: # of bits needed for session->cmds_max
diff --git a/drivers/scsi/cxgb3i/cxgb3i_init.c b/drivers/scsi/cxgb3i/cxgb3i_init.c
index 236d5e1..6703682 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_init.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_init.c
@@ -48,7 +48,6 @@ static void open_s3_dev(struct t3cdev *t3dev)
vers_printed = 1;
}
- cxgb3i_log_debug("open cxgb3 %s.\n", t3dev->name);
cxgb3i_sdev_add(t3dev, &t3c_client);
cxgb3i_adapter_add(t3dev);
}
@@ -59,7 +58,6 @@ static void open_s3_dev(struct t3cdev *t3dev)
*/
static void close_s3_dev(struct t3cdev *t3dev)
{
- cxgb3i_log_debug("close cxgb3 %s.\n", t3dev->name);
cxgb3i_adapter_remove(t3dev);
cxgb3i_sdev_remove(t3dev);
}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
index 207c182..cf12eb1 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -253,7 +253,7 @@ static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
cxgb3i_log_info("NOT going through cxgbi device.\n");
goto release_conn;
}
- if (c3cn_in_state(c3cn, C3CN_STATE_CLOSE)) {
+ if (c3cn_is_closing(c3cn)) {
err = -ENOSPC;
cxgb3i_log_info("ep connect unable to connect.\n");
goto release_conn;
@@ -292,7 +292,7 @@ static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
struct cxgb3i_endpoint *cep = ep->dd_data;
struct s3_conn *c3cn = cep->c3cn;
- if (!c3cn_in_state(c3cn, C3CN_STATE_ESTABLISHED))
+ if (!c3cn_is_established(c3cn))
return 0;
cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
return 1;
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c
index 8d0b3bf..06cc7c9 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.c
@@ -1,12 +1,15 @@
/*
- * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
+ * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
*
- * Written by Dimitris Michailidis (dm@xxxxxxxxxxx)
+ * 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@xxxxxxxxxxx)
+ * Karen Xie (kxie@xxxxxxxxxxx)
*/
#include <linux/if_vlan.h>
@@ -17,7 +20,29 @@
#include "firmware_exports.h"
#include "cxgb3i_offload.h"
#include "cxgb3i_ulp2.h"
+#include "cxgb3i_ddp.h"
+
+#ifdef __DEBUG_C3CN_CONN__
+#define c3cn_conn_debug cxgb3i_log_info
+#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)");
@@ -39,24 +64,91 @@ 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)");
-#ifdef __DEBUG_C3CN_TX__
-#define c3cn_tx_debug cxgb3i_log_debug
-#else
-#define c3cn_tx_debug(fmt...)
-#endif
+/*
+ * 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 != 0) {
+ idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
+ if (idx < 0 || idx >= cxgb3_max_connect)
+ return 0;
+ if (!test_and_set_bit(idx, cdata->sport_map))
+ return -EADDRINUSE;
+ }
+
+ /* the sport_map_next may not be accurate but that is okay, sport_map
+ should be */
+ start = idx = cdata->sport_map_next;
+ do {
+ if (++idx >= cxgb3_max_connect)
+ idx = 0;
+ if (!(test_and_set_bit(idx, cdata->sport_map))) {
+ c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
+ cdata->sport_map_next = idx;
+ c3cn_conn_debug("%s reserve port %u.\n",
+ cdata->cdev->name,
+ cxgb3_sport_base + idx);
+ return 0;
+ }
+ } while (idx != start);
+
+error_out:
+ return -EADDRNOTAVAIL;
+}
+
+static void c3cn_put_port(struct s3_conn *c3cn)
+{
+ struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
+
+ if (c3cn->saddr.sin_port) {
+ int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
+
+ c3cn->saddr.sin_port = 0;
+ if (idx < 0 || idx >= cxgb3_max_connect)
+ return;
+ clear_bit(idx, cdata->sport_map);
+ c3cn_conn_debug("%s, release port %u.\n",
+ cdata->cdev->name, cxgb3_sport_base + idx);
+ }
+}
-/* connection flags */
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 0x%x, f 0x%lx.\n",
+ c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
-static inline void c3cn_reset_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
+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 0x%x, f 0x%lx.\n",
+ c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
c3cn, flag, c3cn->state, c3cn->flags);
}
@@ -67,14 +159,12 @@ static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
return test_bit(flag, &c3cn->flags);
}
-/* connection state */
static void c3cn_set_state(struct s3_conn *c3cn, int state)
{
- c3cn_conn_debug("c3cn 0x%p state -> 0x%x.\n", c3cn, state);
+ c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
c3cn->state = state;
}
-/* connection reference count */
static inline void c3cn_hold(struct s3_conn *c3cn)
{
atomic_inc(&c3cn->refcnt);
@@ -83,431 +173,316 @@ static inline void c3cn_hold(struct s3_conn *c3cn)
static inline void c3cn_put(struct s3_conn *c3cn)
{
if (atomic_dec_and_test(&c3cn->refcnt)) {
- c3cn_conn_debug("free c3cn 0x%p, 0x%x, 0x%lx.\n",
+ c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
kfree(c3cn);
}
}
-/* minimal port allocation management scheme */
-static spinlock_t sport_map_lock;
-static unsigned int sport_map_next;
-static unsigned long *sport_map;
+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.
+ */
/*
- * Find a free source port in our 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 scheme just let them use it.
+ * CPL connection active open request: host ->
*/
-static int c3cn_get_port(struct s3_conn *c3cn)
+static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
{
- unsigned int start;
+ int i = 0;
- if (!sport_map)
- goto error_out;
+ while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
+ ++i;
+ return i;
+}
- if (c3cn->saddr.sin_port != 0) {
- int sport = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
- int err = 0;
+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 (sport < 0 || sport >= cxgb3_max_connect)
- return 0;
- spin_lock(&sport_map_lock);
- err = __test_and_set_bit(sport, sport_map);
- spin_unlock(&sport_map_lock);
- return err ? -EADDRINUSE : 0;
- }
+ 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;
+}
- spin_lock(&sport_map_lock);
- start = sport_map_next;
- do {
- unsigned int new = sport_map_next;
- if (++sport_map_next >= cxgb3_max_connect)
- sport_map_next = 0;
- if (!(__test_and_set_bit(new, sport_map))) {
- spin_unlock(&sport_map_lock);
- c3cn_conn_debug("reserve port %u.\n",
- cxgb3_sport_base + new);
- c3cn->saddr.sin_port = htons(cxgb3_sport_base + new);
- return 0;
- }
- } while (sport_map_next != start);
- spin_unlock(&sport_map_lock);
+static inline int compute_wscale(int win)
+{
+ int wscale = 0;
+ while (wscale < 14 && (65535<<wscale) < win)
+ wscale++;
+ return wscale;
+}
-error_out:
- return -EADDRNOTAVAIL;
+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);
}
-/*
- * Deallocate a source port from the allocation map. If the source port is
- * outside our allocation range just return -- the caller is responsible for
- * keeping track of their port usage outside of our allocation map.
- */
-static void c3cn_put_port(struct s3_conn *c3cn)
+static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
{
- if (c3cn->saddr.sin_port) {
- int old = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
- c3cn->saddr.sin_port = 0;
+ return V_ULP_MODE(ULP_MODE_ISCSI) |
+ V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
+}
- if (old < 0 || old >= cxgb3_max_connect)
- return;
+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("release port %u.\n", cxgb3_sport_base + old);
- spin_lock(&sport_map_lock);
- __clear_bit(old, sport_map);
- spin_unlock(&sport_map_lock);
- }
+ 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 c3cn_reset_timer(struct s3_conn *c3cn, struct timer_list *timer,
- unsigned long expires)
+static void fail_act_open(struct s3_conn *c3cn, int errno)
{
- if (!mod_timer(timer, expires))
- c3cn_hold(c3cn);
+ c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
+ c3cn, c3cn->state, c3cn->flags);
+ c3cn->err = errno;
+ c3cn_closed(c3cn);
}
-typedef int (cxgb3_cpl_handler_decl) (struct t3cdev *,
- struct sk_buff *, void *);
-
-static cxgb3_cpl_handler_decl do_act_establish;
-static cxgb3_cpl_handler_decl do_act_open_rpl;
-static cxgb3_cpl_handler_decl do_wr_ack;
-static cxgb3_cpl_handler_decl do_peer_close;
-static cxgb3_cpl_handler_decl do_abort_req;
-static cxgb3_cpl_handler_decl do_abort_rpl;
-static cxgb3_cpl_handler_decl do_close_con_rpl;
-static cxgb3_cpl_handler_decl do_iscsi_hdr;
+static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
+{
+ struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
-static LIST_HEAD(cxgb3_list);
-static DEFINE_MUTEX(cxgb3_list_lock);
+ c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-/*
- * For ULP connections HW may inserts digest bytes into the pdu. This array
- * contains the compensating extra lengths for ULP packets. It is indexed by
- * a packet's ULP submode.
- */
-static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
+ 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);
+}
/*
- * Return the length of any HW additions that will be made to a Tx packet.
- * Such additions can happen for some types of ULP packets.
+ * 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 inline unsigned int ulp_extra_len(const struct sk_buff *skb)
+static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
+ int flags)
{
- return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
+ CXGB3_SKB_CB(skb)->seq = c3cn->write_seq;
+ CXGB3_SKB_CB(skb)->flags = flags;
+ __skb_queue_tail(&c3cn->write_queue, skb);
}
-/*
- * Size of WRs in bytes. Note that we assume all devices we are handling have
- * the same WR size.
- */
-static unsigned int wrlen __read_mostly;
-
-/*
- * The number of WRs needed for an skb depends on the number of page 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.
- */
-static unsigned int skb_wrs[MAX_SKB_FRAGS + 2] __read_mostly;
-
-static void s3_init_wr_tab(unsigned int wr_len)
+static void send_close_req(struct s3_conn *c3cn)
{
- int i;
+ 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;
- if (skb_wrs[1]) /* already initialized */
- return;
+ c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
+ c3cn, c3cn->state, c3cn->flags);
- for (i = 1; i < ARRAY_SIZE(skb_wrs); i++) {
- int sgl_len = (3 * i) / 2 + (i & 1);
+ c3cn->cpl_close = NULL;
- sgl_len += 3;
- skb_wrs[i] = (sgl_len <= wr_len
- ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
- }
+ 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);
- wrlen = wr_len * 8;
+ skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
+ if (c3cn->state != C3CN_STATE_CONNECTING)
+ c3cn_push_tx_frames(c3cn, 1);
}
/*
- * cxgb3i API operations.
- */
-/*
- * large memory chunk allocation/release
+ * 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.
*/
-void *cxgb3i_alloc_big_mem(unsigned int size)
+static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
{
- void *p = kmalloc(size, GFP_KERNEL);
- if (!p)
- p = vmalloc(size);
- if (p)
- memset(p, 0, size);
- return p;
-}
+ struct cpl_abort_req *req = cplhdr(skb);
-void cxgb3i_free_big_mem(void *addr)
-{
- if (is_vmalloc_addr(addr))
- vfree(addr);
- else
- kfree(addr);
-}
+ c3cn_conn_debug("tdev 0x%p.\n", cdev);
-void cxgb3i_sdev_cleanup(void)
-{
- if (sport_map)
- cxgb3i_free_big_mem(sport_map);
+ req->cmd = CPL_ABORT_NO_RST;
+ cxgb3_ofld_send(cdev, skb);
}
-int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
+static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
{
- 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;
+ struct sk_buff *skb;
- if (cxgb3_max_connect > CXGB3I_MAX_CONN)
- cxgb3_max_connect = CXGB3I_MAX_CONN;
- sport_map = cxgb3i_alloc_big_mem(DIV_ROUND_UP(cxgb3_max_connect,
- 8 *
- sizeof(unsigned long)));
- if (!sport_map)
- return -ENOMEM;
- return 0;
+ while ((skb = __skb_dequeue(&c3cn->write_queue)))
+ __kfree_skb(skb);
}
-void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
+static void send_abort_req(struct s3_conn *c3cn)
{
- struct cxgb3i_sdev_data *cdata;
- struct adap_ports *ports;
- struct ofld_page_info rx_page_info;
- unsigned int wr_len;
- int i;
+ struct sk_buff *skb = c3cn->cpl_abort_req;
+ struct cpl_abort_req *req;
+ unsigned int tid = c3cn->tid;
- cdata = kzalloc(sizeof *cdata, GFP_KERNEL);
- if (!cdata)
+ if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
+ !c3cn->cdev)
return;
- ports = kzalloc(sizeof *ports, GFP_KERNEL);
- if (!ports)
- goto free_ports;
- cdata->ports = ports;
- 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)
- goto free_ports;
+ c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
- s3_init_wr_tab(wr_len);
+ c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
- INIT_LIST_HEAD(&cdata->list);
- cdata->cdev = cdev;
- cdata->client = client;
- cdata->rx_page_size = rx_page_info.page_size;
- skb_queue_head_init(&cdata->deferq);
+ c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
- for (i = 0; i < ports->nports; i++)
- NDEV2CDATA(ports->lldevs[i]) = cdata;
+ /* Purge the send queue so we don't send anything after an abort. */
+ c3cn_purge_write_queue(c3cn);
- mutex_lock(&cxgb3_list_lock);
- list_add_tail(&cdata->list, &cxgb3_list);
- mutex_unlock(&cxgb3_list_lock);
+ c3cn->cpl_abort_req = NULL;
+ req = (struct cpl_abort_req *)skb->head;
- return;
+ 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;
-free_ports:
- kfree(ports);
- kfree(cdata);
+ l2t_send(c3cn->cdev, skb, c3cn->l2t);
}
-void cxgb3i_sdev_remove(struct t3cdev *cdev)
+/*
+ * 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 cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
- struct adap_ports *ports = cdata->ports;
- int i;
+ struct sk_buff *skb = c3cn->cpl_abort_rpl;
+ struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
- for (i = 0; i < ports->nports; i++)
- NDEV2CDATA(ports->lldevs[i]) = NULL;
+ c3cn->cpl_abort_rpl = NULL;
- mutex_lock(&cxgb3_list_lock);
- list_del(&cdata->list);
- mutex_unlock(&cxgb3_list_lock);
+ 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;
- kfree(ports);
- kfree(cdata);
+ cxgb3_ofld_send(c3cn->cdev, skb);
}
/*
- * Return TRUE if the specified net device is for a port on one of our
- * registered adapters.
+ * CPL connection rx data ack: host ->
+ * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
+ * credits sent.
*/
-static int is_cxgb3_dev(struct net_device *dev)
+static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
{
- struct cxgb3i_sdev_data *cdata;
+ struct sk_buff *skb;
+ struct cpl_rx_data_ack *req;
- mutex_lock(&cxgb3_list_lock);
- list_for_each_entry(cdata, &cxgb3_list, list) {
- struct adap_ports *ports = cdata->ports;
- int i;
+ skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
+ if (!skb)
+ return 0;
- for (i = 0; i < ports->nports; i++)
- if (dev == ports->lldevs[i]) {
- mutex_unlock(&cxgb3_list_lock);
- return 1;
- }
- }
- mutex_unlock(&cxgb3_list_lock);
- 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;
}
/*
- * Primary cxgb3 API operations.
- * =============================
+ * 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).
*/
-static int s3_push_frames(struct s3_conn *, int);
-static int s3_send_reset(struct s3_conn *, int, struct sk_buff *);
-static void t3_release_offload_resources(struct s3_conn *);
-static void mk_close_req(struct s3_conn *);
-
-struct s3_conn *cxgb3i_c3cn_create(void)
-{
- struct s3_conn *c3cn;
-
- c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
- if (c3cn == NULL)
- return NULL;
-
- 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;
-}
-
-static inline void s3_purge_write_queue(struct s3_conn *c3cn)
+/*
+ * 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)
{
- struct sk_buff *skb;
-
- while ((skb = __skb_dequeue(&c3cn->write_queue)))
- __kfree_skb(skb);
+ return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
}
-static void c3cn_done(struct s3_conn *c3cn)
-{
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+static unsigned int wrlen __read_mostly;
- c3cn_put_port(c3cn);
- t3_release_offload_resources(c3cn);
- c3cn_set_state(c3cn, C3CN_STATE_CLOSE);
- c3cn->shutdown = C3CN_SHUTDOWN_MASK;
- cxgb3i_conn_closing(c3cn);
-}
+/*
+ * 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 max. length of an skb is controlled by the max pdu size which is ~16K.
+ * Also, assume the min. fragment length is the sector size (512), then add
+ * extra fragment counts for iscsi bhs and payload padding.
+ */
+#define SKB_WR_LIST_SIZE (16384/512 + 3)
+static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
-static void c3cn_close(struct s3_conn *c3cn)
+static void s3_init_wr_tab(unsigned int wr_len)
{
- int data_lost, old_state;
-
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- dst_confirm(c3cn->dst_cache);
+ int i;
- spin_lock_bh(&c3cn->lock);
- c3cn->shutdown |= C3CN_SHUTDOWN_MASK;
+ if (skb_wrs[1]) /* already initialized */
+ return;
- /*
- * We need to flush the receive buffs. We do this only on the
- * descriptor close, not protocol-sourced closes, because the
- * reader process may not have drained the data yet! Make a note
- * of whether any received data will be lost so we can decide whether
- * to FIN or RST.
- */
- data_lost = skb_queue_len(&c3cn->receive_queue);
- __skb_queue_purge(&c3cn->receive_queue);
+ for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
+ int sgl_len = (3 * i) / 2 + (i & 1);
- if (c3cn->state == C3CN_STATE_CLOSE)
- /* Nothing if we are already closed */
- c3cn_conn_debug("c3cn 0x%p, 0x%x, already closed.\n",
- c3cn, c3cn->state);
- else if (data_lost || c3cn->state == C3CN_STATE_SYN_SENT) {
- c3cn_conn_debug("c3cn 0x%p, 0x%x -> closing, send reset.\n",
- c3cn, c3cn->state);
- /* Unread data was tossed, zap the connection. */
- s3_send_reset(c3cn, CPL_ABORT_SEND_RST, NULL);
- goto unlock;
- } else if (c3cn->state == C3CN_STATE_ESTABLISHED) {
- c3cn_conn_debug("c3cn 0x%p, est. -> closing, send close_req.\n",
- c3cn);
- c3cn_set_state(c3cn, C3CN_STATE_CLOSING);
- mk_close_req(c3cn);
+ sgl_len += 3;
+ skb_wrs[i] = (sgl_len <= wr_len
+ ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
}
-unlock:
- old_state = c3cn->state;
- c3cn_hold(c3cn); /* must last past the potential destroy() */
-
- spin_unlock_bh(&c3cn->lock);
-
- /*
- * There are no more user references at this point. Grab the
- * connection lock and finish the close.
- */
- local_bh_disable();
- spin_lock(&c3cn->lock);
-
- /*
- * Because the connection was orphaned before the spin_lock()
- * either the backlog or a BH may have already destroyed it.
- * Bail out if so.
- */
- if (old_state != C3CN_STATE_CLOSE && c3cn->state == C3CN_STATE_CLOSE)
- goto out;
-
- if (c3cn->state == C3CN_STATE_CLOSE)
- s3_purge_write_queue(c3cn);
-
-out:
- spin_unlock(&c3cn->lock);
- local_bh_enable();
- c3cn_put(c3cn);
-}
-
-void cxgb3i_c3cn_release(struct s3_conn *c3cn)
-{
- c3cn_conn_debug("c3cn 0x%p, s 0x%x, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- if (likely(c3cn->state != C3CN_STATE_SYN_SENT))
- c3cn_close(c3cn);
- else
- c3cn_set_flag(c3cn, C3CN_CLOSE_NEEDED);
- c3cn_put(c3cn);
+ wrlen = wr_len * 8;
}
-
-/*
- * Local utility routines used to implement primary cxgb3 API operations.
- * ======================================================================
- */
-
-static u32 s3_send_rx_credits(struct s3_conn *, u32, u32, int);
-static int act_open(struct s3_conn *, struct net_device *);
-static void mk_act_open_req(struct s3_conn *, struct sk_buff *,
- unsigned int, const struct l2t_entry *);
-static void skb_entail(struct s3_conn *, struct sk_buff *, int);
-
static inline void reset_wr_list(struct s3_conn *c3cn)
{
c3cn->wr_pending_head = NULL;
@@ -525,7 +500,7 @@ static inline void enqueue_wr(struct s3_conn *c3cn,
/*
* 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
+ * 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.
*/
@@ -538,34 +513,37 @@ static inline void enqueue_wr(struct s3_conn *c3cn,
c3cn->wr_pending_tail = skb;
}
-/*
- * The next two functions calculate the option 0 value for a connection.
- */
-static inline int compute_wscale(int win)
+static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
{
- int wscale = 0;
- while (wscale < 14 && (65535<<wscale) < win)
- wscale++;
- return wscale;
+ return c3cn->wr_pending_head;
}
-static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
+static inline void free_wr_skb(struct sk_buff *skb)
{
- 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);
+ kfree_skb(skb);
}
-static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
+static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
{
- return V_ULP_MODE(ULP_MODE_ISCSI) |
- V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
+ struct sk_buff *skb = c3cn->wr_pending_head;
+
+ if (likely(skb)) {
+ /* Don't bother clearing the tail */
+ c3cn->wr_pending_head = (struct sk_buff *)skb->sp;
+ skb->sp = NULL;
+ }
+ return skb;
}
-static inline void make_tx_data_wr(struct s3_conn *c3cn,
- struct sk_buff *skb, int len)
+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)
{
struct tx_data_wr *req;
@@ -582,242 +560,49 @@ static inline void make_tx_data_wr(struct s3_conn *c3cn,
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.
- */
+ /* Sendbuffer is in units of 32KB. */
req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
}
}
/**
- * 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
+ * c3cn_push_tx_frames -- start transmit
+ * @c3cn: the offloaded connection
+ * @req_completion: request wr_ack or not
*
- * Return egress device or NULL if the egress device isn't one of our ports.
- *
- * Given a root network device it returns the physical egress device that is a
- * descendant of the root device. The root device may be either a physical
- * device, in which case it is the device returned, or a virtual device, such
- * as a VLAN or bonding device. In case of a bonding device the search
- * considers the decisions of the bonding device given its mode to locate the
- * correct egress device.
- */
-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(__be32 saddr, __be32 daddr,
- __be16 sport, __be16 dport)
-{
- struct rtable *rt;
- struct flowi fl = {
- .oif = 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;
-}
-
-int cxgb3i_c3cn_connect(struct s3_conn *c3cn, struct sockaddr_in *usin)
-{
- struct rtable *rt;
- struct net_device *dev;
- struct cxgb3i_sdev_data *cdata;
- struct t3cdev *cdev;
- __be32 sipv4;
- int err;
-
- if (usin->sin_family != AF_INET)
- return -EAFNOSUPPORT;
-
- /* get a source port if one hasn't been provided */
- err = c3cn_get_port(c3cn);
- if (err)
- return err;
-
- c3cn_conn_debug("c3cn 0x%p get port %u.\n",
- c3cn, ntohs(c3cn->saddr.sin_port));
-
- c3cn->daddr.sin_port = usin->sin_port;
- c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
-
- rt = find_route(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.\n",
- c3cn->daddr.sin_addr.s_addr,
- ntohs(c3cn->daddr.sin_port));
- return -ENETUNREACH;
- }
-
- if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
- c3cn_conn_debug("multi-cast route to 0x%x, port %u.\n",
- c3cn->daddr.sin_addr.s_addr,
- ntohs(c3cn->daddr.sin_port));
- 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;
-
- 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, %u.%u.%u.%u,%u-%u.%u.%u.%u,%u SYN_SENT.\n",
- c3cn, NIPQUAD(c3cn->saddr.sin_addr.s_addr),
- ntohs(c3cn->saddr.sin_port),
- NIPQUAD(c3cn->daddr.sin_addr.s_addr),
- ntohs(c3cn->daddr.sin_port));
-
- c3cn_set_state(c3cn, C3CN_STATE_SYN_SENT);
-
- if (!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 -> CLOSE.\n", c3cn);
- c3cn_set_state(c3cn, C3CN_STATE_CLOSE);
- ip_rt_put(rt);
- c3cn_put_port(c3cn);
- c3cn->daddr.sin_port = 0;
- return err;
-}
-
-/*
- * Set of states for which we should return RX credits.
- */
-#define CREDIT_RETURN_STATE (C3CN_STATE_ESTABLISHED)
-
-/*
- * 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_in_state(c3cn, CREDIT_RETURN_STATE))
- 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 += s3_send_rx_credits(c3cn, credits, dack,
- must_send);
-}
-
-/*
- * Generic ARP failure handler that discards the buffer.
+ * 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);
}
-/*
- * 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 int s3_push_frames(struct s3_conn *c3cn, int req_completion)
+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_in_state(c3cn,
- C3CN_STATE_SYN_SENT | C3CN_STATE_CLOSE)))
- return 0;
-
- /*
- * We shouldn't really be called at all after an abort but check just
- * in case.
- */
- if (unlikely(c3cn_flag(c3cn, C3CN_ABORT_SHUTDOWN)))
+ 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
- && !c3cn_flag(c3cn, C3CN_TX_WAIT_IDLE)) {
-
+ && (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];
@@ -825,10 +610,15 @@ static int s3_push_frames(struct s3_conn *c3cn, int req_completion)
if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
wrs_needed = 1;
- WARN_ON(frags >= ARRAY_SIZE(skb_wrs) || wrs_needed < 1);
+ WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
- if (c3cn->wr_avail < wrs_needed)
+ 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->datalen, frags,
+ wrs_needed, c3cn->wr_avail);
break;
+ }
__skb_unlink(skb, &c3cn->write_queue);
skb->priority = CPL_PRIORITY_DATA;
@@ -851,8 +641,7 @@ static int s3_push_frames(struct s3_conn *c3cn, int req_completion)
c3cn->wr_unacked = 0;
}
CXGB3_SKB_CB(skb)->flags &= ~C3CB_FLAG_NEED_HDR;
- } else if (skb->data[0] == FW_WROPCODE_OFLD_CLOSE_CON)
- c3cn_set_flag(c3cn, C3CN_CLOSE_CON_REQUESTED);
+ }
total_size += skb->truesize;
set_arp_failure_handler(skb, arp_failure_discard);
@@ -862,487 +651,345 @@ static int s3_push_frames(struct s3_conn *c3cn, int req_completion)
}
/*
- * Handle an ARP failure for a CPL_ABORT_REQ. Change it into a no RST variant
- * and send it along.
- */
-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);
-}
-
-/*
- * Send an ABORT_REQ message. Cannot fail. This routine 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. Returns 1 if
- * an ABORT_REQ wasn't generated after all, 0 otherwise.
+ * process_cpl_msg: -> host
+ * Top-level CPL message processing used by most CPL messages that
+ * pertain to connections.
*/
-static int s3_send_reset(struct s3_conn *c3cn, int mode,
- struct sk_buff *skb)
-{
- struct cpl_abort_req *req;
- unsigned int tid = c3cn->tid;
-
- if (unlikely(c3cn_flag(c3cn, C3CN_ABORT_SHUTDOWN) || !c3cn->cdev)) {
- if (skb)
- __kfree_skb(skb);
- return 1;
- }
-
- c3cn_conn_debug("c3cn 0x%p, mode %d, flag ABORT_RPL + ABORT_SHUT.\n",
- c3cn, mode);
-
- c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
- c3cn_set_flag(c3cn, C3CN_ABORT_SHUTDOWN);
-
- /* Purge the send queue so we don't send anything after an abort. */
- s3_purge_write_queue(c3cn);
-
- if (!skb)
- skb = alloc_skb(sizeof(*req), GFP_KERNEL | __GFP_NOFAIL);
- skb->priority = CPL_PRIORITY_DATA;
- set_arp_failure_handler(skb, abort_arp_failure);
-
- req = (struct cpl_abort_req *)skb_put(skb, sizeof(*req));
- 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 = mode;
-
- l2t_send(c3cn->cdev, skb, c3cn->l2t);
- return 0;
-}
-
-/*
- * Add a list of skbs to a connection send queue. This interface is intended
- * for use by in-kernel ULPs. The skbs must comply with the max size limit of
- * the device and have a headroom of at least TX_HEADER_LEN bytes.
- */
-int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb, int flags)
+static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
+ struct sk_buff *),
+ struct s3_conn *c3cn,
+ struct sk_buff *skb)
{
- struct sk_buff *next;
- int err, copied = 0;
-
spin_lock_bh(&c3cn->lock);
-
- if (!c3cn_in_state(c3cn, C3CN_STATE_ESTABLISHED)) {
- err = -EAGAIN;
- goto out_err;
- }
-
- err = -EPIPE;
- if (c3cn->err || (c3cn->shutdown & C3CN_SEND_SHUTDOWN))
- goto out_err;
-
- while (skb) {
- if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
- c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
- 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)))
- s3_push_frames(c3cn, 1);
+ fn(c3cn, skb);
spin_unlock_bh(&c3cn->lock);
- return copied;
-
-out_err:
- if (copied == 0 && err == -EPIPE)
- copied = c3cn->err ? c3cn->err : -EPIPE;
- goto done;
}
/*
- * Low-level utility routines for primary API functions.
- * =====================================================
- */
-/* routines to implement CPL message processing */
-static void c3cn_act_establish(struct s3_conn *, struct sk_buff *);
-static void active_open_failed(struct s3_conn *, struct sk_buff *);
-static void wr_ack(struct s3_conn *, struct sk_buff *);
-static void do_peer_fin(struct s3_conn *, struct sk_buff *);
-static void process_abort_req(struct s3_conn *, struct sk_buff *);
-static void process_abort_rpl(struct s3_conn *, struct sk_buff *);
-static void process_close_con_rpl(struct s3_conn *, struct sk_buff *);
-static void process_rx_iscsi_hdr(struct s3_conn *, struct sk_buff *);
-
-static struct sk_buff *__get_cpl_reply_skb(struct sk_buff *, size_t, gfp_t);
-
-static void fail_act_open(struct s3_conn *, int);
-static void init_offload_conn(struct s3_conn *, struct t3cdev *,
- struct dst_entry *);
-
-/*
- * Insert a connection into the TID table and take an extra reference.
+ * 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 c3cn_insert_tid(struct cxgb3i_sdev_data *cdata,
- struct s3_conn *c3cn,
- unsigned int tid)
+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);
- cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
+ process_cpl_msg(fn, c3cn, skb);
+ c3cn_put(c3cn);
}
-static inline void free_atid(struct t3cdev *cdev, unsigned int tid)
+/*
+ * 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);
}
-/*
- * This function is intended for allocations of small control messages.
- * Such messages go as immediate data and usually the pakets are freed
- * immediately. We maintain a cache of one small sk_buff and use it whenever
- * it is available (has a user count of 1). Otherwise we get a fresh buffer.
- */
-#define CTRL_SKB_LEN 120
-
-static struct sk_buff *alloc_ctrl_skb(const struct s3_conn *c3cn,
- int len)
+static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
+ unsigned int opt)
{
- struct sk_buff *skb = c3cn->ctrl_skb_cache;
+ c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
- if (likely(skb && !skb_shared(skb) && !skb_cloned(skb))) {
- __skb_trim(skb, 0);
- atomic_set(&skb->users, 2);
- } else if (likely(!in_atomic()))
- skb = alloc_skb(len, GFP_ATOMIC | __GFP_NOFAIL);
- else
- skb = alloc_skb(len, GFP_ATOMIC);
- return skb;
-}
+ c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
-/*
- * Handle an ARP failure for an active open.
- */
-static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
-{
- struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
+ /*
+ * 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);
- c3cn_conn_debug("c3cn 0x%p, state 0x%x.\n", c3cn, c3cn->state);
+ dst_confirm(c3cn->dst_cache);
- c3cn_hold(c3cn);
- spin_lock(&c3cn->lock);
- if (c3cn->state == C3CN_STATE_SYN_SENT) {
- fail_act_open(c3cn, EHOSTUNREACH);
- __kfree_skb(skb);
- }
- spin_unlock(&c3cn->lock);
- c3cn_put(c3cn);
+ smp_mb();
+
+ c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
}
-/*
- * Send an active open request.
- */
-static int act_open(struct s3_conn *c3cn, struct net_device *dev)
+static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
{
- struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
- struct t3cdev *cdev = cdata->cdev;
- struct dst_entry *dst = c3cn->dst_cache;
- 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 0x%x, flag 0x%lx.\n",
+ 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;
+ if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
+ cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
+ c3cn->tid, c3cn->state);
- 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;
- c3cn_reset_flag(c3cn, C3CN_DONE);
+ c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
+ c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
- mk_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
- l2t_send(cdev, skb, c3cn->l2t);
- return 0;
+ __kfree_skb(skb);
-free_l2t:
- l2t_release(L2DATA(cdev), c3cn->l2t);
-free_tid:
- free_atid(cdev, c3cn->tid);
- c3cn->tid = 0;
-out_err:
- return -1;
+ if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
+ /* upper layer has requested closing */
+ send_abort_req(c3cn);
+ else if (c3cn_push_tx_frames(c3cn, 1))
+ cxgb3i_conn_tx_open(c3cn);
}
-/*
- * Close a connection by sending a CPL_CLOSE_CON_REQ message. Cannot fail
- * under any circumstances. We take the easy way out and always queue the
- * message to the write_queue. We can optimize the case where the queue is
- * already empty though the optimization is probably not worth it.
- */
-static void mk_close_req(struct s3_conn *c3cn)
+static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
+ void *ctx)
{
- struct sk_buff *skb;
- struct cpl_close_con_req *req;
- unsigned int tid = c3cn->tid;
+ 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("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+ c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
+ tid, c3cn, c3cn->state, c3cn->flags);
- skb = alloc_skb(sizeof(struct cpl_close_con_req),
- GFP_KERNEL | __GFP_NOFAIL);
- req = (struct cpl_close_con_req *)__skb_put(skb, sizeof(*req));
- 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);
+ c3cn->tid = tid;
+ c3cn_hold(c3cn);
+ cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
+ s3_free_atid(cdev, atid);
- skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
- if (c3cn->state != C3CN_STATE_SYN_SENT)
- s3_push_frames(c3cn, 1);
-}
+ c3cn->qset = G_QNUM(ntohl(skb->csum));
-static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
- int flags)
-{
- CXGB3_SKB_CB(skb)->seq = c3cn->write_seq;
- CXGB3_SKB_CB(skb)->flags = flags;
- __skb_queue_tail(&c3cn->write_queue, skb);
+ process_cpl_msg(process_act_establish, c3cn, skb);
+ return 0;
}
/*
- * Send RX credits through an RX_DATA_ACK CPL message. If nofail is 0 we are
- * permitted to return without sending the message in case we cannot allocate
- * an sk_buff. Returns the number of credits sent.
+ * Process a CPL_ACT_OPEN_RPL message: -> host
+ * Handle active open failures.
*/
-static u32 s3_send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack,
- int nofail)
+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 cpl_rx_data_ack *req;
+ struct s3_conn *c3cn = (struct s3_conn *)data;
- skb = (nofail ? alloc_ctrl_skb(c3cn, sizeof(*req))
- : alloc_skb(sizeof(*req), GFP_ATOMIC));
- if (!skb)
- return 0;
+ c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
- 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;
+ 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 mk_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
- unsigned int atid, const struct l2t_entry *e)
+static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
- struct cpl_act_open_req *req;
+ struct cpl_act_open_rpl *rpl = cplhdr(skb);
- c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
+ c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
+ c3cn, c3cn->state, c3cn->flags);
- 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;
+ 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);
}
-/*
- * Definitions and declarations for CPL handler functions.
- * =======================================================
- */
-
-/*
- * 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)
+static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
{
- c3cn_hold(c3cn);
- process_cpl_msg(fn, c3cn, skb);
- c3cn_put(c3cn);
-}
+ struct s3_conn *c3cn = ctx;
+ struct cpl_act_open_rpl *rpl = cplhdr(skb);
-/*
- * Return whether a failed active open has allocated a TID
- */
-static inline int act_open_has_tid(int status)
-{
- return status != CPL_ERR_TCAM_FULL && status != CPL_ERR_CONN_EXIST &&
- status != CPL_ERR_ARP_MISS;
-}
+ c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
+ rpl->status, c3cn, c3cn->state, c3cn->flags);
-/*
- * Returns true if a connection cannot accept new Rx data.
- */
-static inline int c3cn_no_receive(const struct s3_conn *c3cn)
-{
- return c3cn->shutdown & C3CN_RCV_SHUTDOWN;
+ 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;
}
/*
- * A helper function that aborts a connection and increments the given MIB
- * counter. The supplied skb is used to generate the ABORT_REQ message if
- * possible. Must be called with softirqs disabled.
+ * Process PEER_CLOSE CPL messages: -> host
+ * Handle peer FIN.
*/
-static inline void abort_conn(struct s3_conn *c3cn,
- struct sk_buff *skb)
+static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
{
- struct sk_buff *abort_skb;
-
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
+ c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
- abort_skb = __get_cpl_reply_skb(skb, sizeof(struct cpl_abort_req),
- GFP_ATOMIC);
- if (abort_skb)
- s3_send_reset(c3cn, CPL_ABORT_SEND_RST, abort_skb);
-}
+ if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
+ goto out;
-/*
- * Returns whether an ABORT_REQ_RSS message is a negative advice.
- */
-static inline int is_neg_adv_abort(unsigned int status)
-{
- return status == CPL_ERR_RTX_NEG_ADVICE ||
- status == CPL_ERR_PERSIST_NEG_ADVICE;
-}
+ 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);
+ }
-/*
- * CPL handler functions.
- * ======================
- */
+ cxgb3i_conn_closing(c3cn);
+out:
+ __kfree_skb(skb);
+}
-/*
- * Process a CPL_ACT_ESTABLISH message.
- */
-static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
- void *ctx)
+static int do_peer_close(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, 0x%x, 0x%lx.\n",
- tid, c3cn, c3cn->state, c3cn->flags);
- /*
- * It's OK if the TID is currently in use, the owning connection may
- * have backlogged its last CPL message(s). Just take it away.
- */
- c3cn->tid = tid;
- c3cn_insert_tid(cdata, c3cn, tid);
- free_atid(cdev, atid);
- c3cn->qset = G_QNUM(ntohl(skb->csum));
-
- process_cpl_msg(c3cn_act_establish, c3cn, skb);
+ 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 an ACT_OPEN_RPL CPL message.
+ * Process CLOSE_CONN_RPL CPL message: -> host
+ * Process a peer ACK to our FIN.
*/
-static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
{
- struct s3_conn *c3cn = ctx;
- struct cpl_act_open_rpl *rpl = cplhdr(skb);
+ struct cpl_close_con_rpl *rpl = cplhdr(skb);
- c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, 0x%x, 0x%lx.\n",
- rpl->status, c3cn, c3cn->state, c3cn->flags);
+ c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
+ c3cn, c3cn->state, c3cn->flags);
- if (act_open_has_tid(rpl->status))
- cxgb3_queue_tid_release(cdev, GET_TID(rpl));
+ c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
- process_cpl_msg_ref(active_open_failed, c3cn, skb);
- return 0;
+ 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);
}
-/*
- * Handler RX_ISCSI_HDR CPL messages.
- */
-static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
+static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
+ void *ctx)
{
struct s3_conn *c3cn = ctx;
- process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
+
+ 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;
}
/*
- * Handler for TX_DATA_ACK CPL messages.
+ * 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 do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- struct s3_conn *c3cn = ctx;
- process_cpl_msg(wr_ack, c3cn, skb);
- return 0;
+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;
+ }
}
-/*
- * Handler for PEER_CLOSE CPL messages.
- */
-static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
{
- struct s3_conn *c3cn = ctx;
+ int rst_status = CPL_ABORT_NO_RST;
+ const struct cpl_abort_req_rss *req = cplhdr(skb);
- c3cn_conn_debug("rcv, c3cn 0x%p, 0x%x, 0x%lx.\n",
+ c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
- process_cpl_msg_ref(do_peer_fin, c3cn, skb);
- return 0;
+
+ 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);
+ }
}
-/*
- * Handle an ABORT_REQ_RSS CPL message.
- */
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, 0x%x, 0x%lx.\n",
+ c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
c3cn, c3cn->state, c3cn->flags);
- if (is_neg_adv_abort(req->status)) {
+ if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
+ req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
__kfree_skb(skb);
return 0;
}
@@ -1352,14 +999,38 @@ static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
}
/*
- * Handle an ABORT_RPL_RSS CPL message.
+ * 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, 0x%x, 0x%lx.\n",
+ 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);
@@ -1377,7 +1048,7 @@ static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
* 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. Only on T3A.
+ * ABORT_RPL_RSS with status 0 and no connection.
*/
if (!c3cn)
goto discard;
@@ -1391,144 +1062,11 @@ discard:
}
/*
- * Handler for CLOSE_CON_RPL CPL messages.
+ * 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 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, 0x%x, 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
- return 0;
-}
-
-/*
- * Definitions and declarations for CPL message processing.
- * ========================================================
- */
-
-static void make_established(struct s3_conn *, u32, unsigned int);
-static void act_open_retry_timer(unsigned long);
-static void mk_act_open_req(struct s3_conn *, struct sk_buff *,
- unsigned int, const struct l2t_entry *);
-static int act_open_rpl_status_to_errno(int);
-static void handle_excess_rx(struct s3_conn *, struct sk_buff *);
-static int abort_status_to_errno(struct s3_conn *, int, int *);
-static void send_abort_rpl(struct sk_buff *, struct t3cdev *, int);
-static struct sk_buff *get_cpl_reply_skb(struct sk_buff *, size_t, gfp_t);
-
-/*
- * Dequeue and return the first unacknowledged's WR on a connections's pending
- * list.
- */
-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 = (struct sk_buff *)skb->sp;
- skb->sp = NULL;
- }
- return skb;
-}
-
-/*
- * Return the first pending WR without removing it from the list.
- */
-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 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 set_abort_rpl_wr(struct sk_buff *skb, unsigned int tid,
- int cmd)
-{
- struct cpl_abort_rpl *rpl = cplhdr(skb);
-
- rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
- rpl->wr.wr_lo = htonl(V_WR_TID(tid));
- OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
- rpl->cmd = cmd;
-}
-
-/*
- * CPL message processing ...
- * ==========================
- */
-
-/*
- * Updates connection state from an active establish CPL message. Runs with
- * the connection lock held.
- */
-static void c3cn_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 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (unlikely(c3cn->state != C3CN_STATE_SYN_SENT))
- printk(KERN_ERR "TID %u expected SYN_SENT, found %d\n",
- c3cn->tid, c3cn->state);
-
- c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
- make_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
-
- if (unlikely(c3cn_flag(c3cn, C3CN_CLOSE_NEEDED))) {
- /* upper layer has requested closing */
- abort_conn(c3cn, skb);
- return;
- }
-
- __kfree_skb(skb);
- if (s3_push_frames(c3cn, 1))
- cxgb3i_conn_tx_open(c3cn);
-}
-
-/*
- * Handle active open failures.
- */
-static void active_open_failed(struct s3_conn *c3cn,
- struct sk_buff *skb)
-{
- struct cpl_act_open_rpl *rpl = cplhdr(skb);
-
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, 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;
- c3cn_reset_timer(c3cn, &c3cn->retry_timer,
- jiffies + HZ / 2);
- } else
- fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
- __kfree_skb(skb);
-}
-
-/*
- * Process received pdu for a connection.
- */
-static void process_rx_iscsi_hdr(struct s3_conn *c3cn,
- struct sk_buff *skb)
+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;
@@ -1537,8 +1075,10 @@ static void process_rx_iscsi_hdr(struct s3_conn *c3cn,
unsigned int len;
int err;
- if (unlikely(c3cn_no_receive(c3cn))) {
- handle_excess_rx(c3cn, skb);
+ if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
+ if (c3cn->state != C3CN_STATE_ABORTING)
+ send_abort_req(c3cn);
+ __kfree_skb(skb);
return;
}
@@ -1551,8 +1091,9 @@ static void process_rx_iscsi_hdr(struct s3_conn *c3cn,
len = hdr_len = ntohs(hdr_cpl->len);
/* msg coalesce is off or not enough data received */
if (skb->len <= hdr_len) {
- printk(KERN_ERR "%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
- c3cn->cdev->name, c3cn->tid, 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;
}
@@ -1566,6 +1107,9 @@ static void process_rx_iscsi_hdr(struct s3_conn *c3cn,
skb_ulp_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_ulp_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))
@@ -1590,15 +1134,24 @@ static void process_rx_iscsi_hdr(struct s3_conn *c3cn,
return;
abort_conn:
- s3_send_reset(c3cn, CPL_ABORT_SEND_RST, NULL);
+ 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 wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
+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);
@@ -1612,9 +1165,9 @@ static void wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
struct sk_buff *p = peek_wr(c3cn);
if (unlikely(!p)) {
- printk(KERN_ERR "%u WR_ACK credits for TID %u with "
- "nothing pending, state %u\n",
- credits, c3cn->tid, c3cn->state);
+ 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)) {
@@ -1633,186 +1186,262 @@ static void wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
if (c3cn->snd_una != snd_una) {
c3cn->snd_una = snd_una;
dst_confirm(c3cn->dst_cache);
- if (c3cn->snd_una == c3cn->snd_nxt)
- c3cn_reset_flag(c3cn, C3CN_TX_WAIT_IDLE);
}
- if (skb_queue_len(&c3cn->write_queue) && s3_push_frames(c3cn, 0))
+ if (skb_queue_len(&c3cn->write_queue) && c3cn_push_tx_frames(c3cn, 0))
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;
+}
+
/*
- * Handle a peer FIN.
+ * for each connection, pre-allocate skbs needed for close/abort requests. So
+ * that we can service the request right away.
*/
-static void do_peer_fin(struct s3_conn *c3cn, struct sk_buff *skb)
+static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
{
- int keep = 0;
+ 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);
+}
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+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));
- if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
- goto out;
+ 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->shutdown |= C3CN_RCV_SHUTDOWN;
- c3cn_set_flag(c3cn, C3CN_DONE);
+ 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));
- switch (c3cn->state) {
- case C3CN_STATE_ESTABLISHED:
- break;
- case C3CN_STATE_CLOSING:
- c3cn_done(c3cn);
- break;
- default:
- printk(KERN_ERR
- "%s: TID %u received PEER_CLOSE in bad state %d\n",
- c3cn->cdev->name, c3cn->tid, c3cn->state);
- }
+ return 0;
- cxgb3i_conn_closing(c3cn);
-out:
- if (!keep)
- __kfree_skb(skb);
+free_cpl_skbs:
+ c3cn_free_cpl_skbs(c3cn);
+ return -ENOMEM;
}
-/*
- * Process abort requests. If we are waiting for an ABORT_RPL we ignore this
- * request except that we need to reply to it.
+/**
+ * c3cn_release_offload_resources -
+ * Release resources held by an offload connection (TID, L2T entry, etc.)
+ * @c3cn: the offloaded iscsi tcp connection.
*/
-static void process_abort_req(struct s3_conn *c3cn,
- struct sk_buff *skb)
+static void c3cn_release_offload_resources(struct s3_conn *c3cn)
{
- int rst_status = CPL_ABORT_NO_RST;
- const struct cpl_abort_req_rss *req = cplhdr(skb);
-
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+ struct t3cdev *cdev = c3cn->cdev;
+ unsigned int tid = c3cn->tid;
- if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
- c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
- c3cn_set_flag(c3cn, C3CN_ABORT_SHUTDOWN);
- __kfree_skb(skb);
+ if (!cdev)
return;
- }
- c3cn_reset_flag(c3cn, C3CN_ABORT_REQ_RCVD);
- /*
- * Three cases to consider:
- * a) We haven't sent an abort_req; close the connection.
- * b) We have sent a post-close abort_req that will get to TP too late
- * and will generate a CPL_ERR_ABORT_FAILED reply. The reply will
- * be ignored and the connection should be closed now.
- * c) We have sent a regular abort_req that will get to TP too late.
- * That will generate an abort_rpl with status 0, wait for it.
- */
- send_abort_rpl(skb, c3cn->cdev, rst_status);
+ c3cn->qset = 0;
- if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
- c3cn->err =
- abort_status_to_errno(c3cn, req->status, &rst_status);
+ c3cn_free_cpl_skbs(c3cn);
- c3cn_done(c3cn);
+ if (c3cn->wr_avail != c3cn->wr_max) {
+ purge_wr_queue(c3cn);
+ reset_wr_list(c3cn);
}
-}
-/*
- * 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 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+ if (c3cn->l2t) {
+ l2t_release(L2DATA(cdev), c3cn->l2t);
+ c3cn->l2t = NULL;
+ }
- 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_reset_flag(c3cn, C3CN_ABORT_RPL_RCVD);
- c3cn_reset_flag(c3cn, C3CN_ABORT_RPL_PENDING);
- BUG_ON(c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD));
- c3cn_done(c3cn);
- }
+ 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);
}
- __kfree_skb(skb);
+
+ c3cn->cdev = NULL;
}
-/*
- * Process a peer ACK to our FIN.
+/**
+ * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
+ * returns the s3_conn structure allocated.
*/
-static void process_close_con_rpl(struct s3_conn *c3cn,
- struct sk_buff *skb)
+struct s3_conn *cxgb3i_c3cn_create(void)
{
- struct cpl_close_con_rpl *rpl = cplhdr(skb);
+ struct s3_conn *c3cn;
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+ c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
+ if (!c3cn)
+ return NULL;
- c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
+ /* 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;
- if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
- goto out;
+ c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
- if (c3cn->state == C3CN_STATE_CLOSING) {
- c3cn_done(c3cn);
- } else
- printk(KERN_ERR
- "%s: TID %u received CLOSE_CON_RPL in bad state %d\n",
- c3cn->cdev->name, c3cn->tid, c3cn->state);
-out:
- kfree_skb(skb);
+ 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;
}
-/*
- * Random utility functions for CPL message processing ...
- * =======================================================
- */
+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);
+}
/**
- * find_best_mtu - find the entry in the MTU table closest to an MTU
- * @d: TOM state
- * @mtu: the target MTU
- *
- * Returns the index of the value in the MTU table that is closest to but
- * does not exceed the target MTU.
+ * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
+ * resource held
+ * @c3cn: the iscsi tcp connection
*/
-static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
+void cxgb3i_c3cn_release(struct s3_conn *c3cn)
{
- int i = 0;
-
- while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
- ++i;
- return i;
+ c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
+ c3cn, c3cn->state, c3cn->flags);
+ if (likely(c3cn->state != C3CN_STATE_CONNECTING))
+ c3cn_active_close(c3cn);
+ else
+ c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
+ c3cn_put(c3cn);
}
-static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
+static int is_cxgb3_dev(struct net_device *dev)
{
- 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);
+ struct cxgb3i_sdev_data *cdata;
- 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;
+ 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 (dev == ports->lldevs[i]) {
+ write_unlock(&cdata_rwlock);
+ return 1;
+ }
+ }
+ write_unlock(&cdata_rwlock);
+ return 0;
}
-static void fail_act_open(struct s3_conn *c3cn, int errno)
+/**
+ * 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)
{
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
+ 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;
+}
- c3cn->err = errno;
- c3cn_done(c3cn);
+static struct rtable *find_route(__be32 saddr, __be32 daddr,
+ __be16 sport, __be16 dport)
+{
+ struct rtable *rt;
+ struct flowi fl = {
+ .oif = 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;
}
/*
@@ -1827,195 +1456,355 @@ static void init_offload_conn(struct s3_conn *c3cn,
c3cn->wr_unacked = 0;
c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
- c3cn->ctrl_skb_cache = alloc_skb(CTRL_SKB_LEN, gfp_any());
reset_wr_list(c3cn);
}
-static void act_open_retry_timer(unsigned long data)
+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;
- struct s3_conn *c3cn = (struct s3_conn *)data;
- c3cn_conn_debug("c3cn 0x%p, state 0x%x.\n", c3cn, c3cn->state);
+ 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;
- spin_lock(&c3cn->lock);
- skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
+ 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)
- fail_act_open(c3cn, ENOMEM);
- else {
- skb->sk = (struct sock *)c3cn;
- set_arp_failure_handler(skb, act_open_req_arp_failure);
- mk_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
- l2t_send(c3cn->cdev, skb, c3cn->l2t);
- }
- spin_unlock(&c3cn->lock);
- c3cn_put(c3cn);
-}
+ goto free_l2t;
-/*
- * Convert an ACT_OPEN_RPL status to a Linux errno.
- */
-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:
- printk(KERN_ERR "ACTIVE_OPEN_RPL: 4-tuple in use\n");
- return EADDRINUSE;
- default:
- return EIO;
- }
+ 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 -1;
}
-/*
- * Convert the status code of an ABORT_REQ into a Linux error code. Also
- * indicate whether RST should be sent in response.
+
+/**
+ * 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.
*/
-static int abort_status_to_errno(struct s3_conn *c3cn,
- int abort_reason, int *need_rst)
+int cxgb3i_c3cn_connect(struct s3_conn *c3cn, struct sockaddr_in *usin)
{
- switch (abort_reason) {
- case CPL_ERR_BAD_SYN: /* fall through */
- case CPL_ERR_CONN_RESET:
- return c3cn->state == C3CN_STATE_CLOSING ? 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;
+ struct rtable *rt;
+ struct net_device *dev;
+ struct cxgb3i_sdev_data *cdata;
+ struct t3cdev *cdev;
+ __be32 sipv4;
+ int err;
+
+ 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;
+
+ rt = find_route(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.\n",
+ c3cn->daddr.sin_addr.s_addr,
+ ntohs(c3cn->daddr.sin_port));
+ return -ENETUNREACH;
}
-}
-static void send_abort_rpl(struct sk_buff *skb, struct t3cdev *cdev,
- int rst_status)
-{
- struct sk_buff *reply_skb;
- struct cpl_abort_req_rss *req = cplhdr(skb);
+ if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
+ c3cn_conn_debug("multi-cast route to 0x%x, port %u.\n",
+ c3cn->daddr.sin_addr.s_addr,
+ ntohs(c3cn->daddr.sin_port));
+ ip_rt_put(rt);
+ return -ENETUNREACH;
+ }
- reply_skb = get_cpl_reply_skb(skb, sizeof(struct cpl_abort_rpl),
- gfp_any());
+ if (!c3cn->saddr.sin_addr.s_addr)
+ c3cn->saddr.sin_addr.s_addr = rt->rt_src;
- reply_skb->priority = CPL_PRIORITY_DATA;
- set_abort_rpl_wr(reply_skb, GET_TID(req), rst_status);
- kfree_skb(skb);
- cxgb3_ofld_send(cdev, reply_skb);
-}
+ /* now commit destination to connection */
+ c3cn->dst_cache = &rt->u.dst;
-/*
- * Returns an sk_buff for a reply CPL message of size len. If the input
- * sk_buff has no other users it is trimmed and reused, otherwise a new buffer
- * is allocated. The input skb must be of size at least len. Note that this
- * operation does not destroy the original skb data even if it decides to reuse
- * the buffer.
- */
-static struct sk_buff *get_cpl_reply_skb(struct sk_buff *skb, size_t len,
- gfp_t gfp)
-{
- if (likely(!skb_cloned(skb))) {
- BUG_ON(skb->len < len);
- __skb_trim(skb, len);
- skb_get(skb);
- } else {
- skb = alloc_skb(len, gfp);
- if (skb)
- __skb_put(skb, len);
+ /* 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;
}
- return skb;
+ 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, %u.%u.%u.%u,%u-%u.%u.%u.%u,%u SYN_SENT.\n",
+ c3cn, NIPQUAD(c3cn->saddr.sin_addr.s_addr),
+ ntohs(c3cn->saddr.sin_port),
+ NIPQUAD(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);
+ c3cn->daddr.sin_port = 0;
+ return err;
}
-/*
- * Release resources held by an offload connection (TID, L2T entry, etc.)
+/**
+ * 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.
*/
-static void t3_release_offload_resources(struct s3_conn *c3cn)
+void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
{
- struct t3cdev *cdev = c3cn->cdev;
- unsigned int tid = c3cn->tid;
+ struct t3cdev *cdev;
+ int must_send;
+ u32 credits, dack = 0;
- if (!cdev)
+ if (c3cn->state != C3CN_STATE_ESTABLISHED)
return;
- c3cn->qset = 0;
+ credits = c3cn->copied_seq - c3cn->rcv_wup;
+ if (unlikely(!credits))
+ return;
- kfree_skb(c3cn->ctrl_skb_cache);
- c3cn->ctrl_skb_cache = NULL;
+ cdev = c3cn->cdev;
- if (c3cn->wr_avail != c3cn->wr_max) {
- purge_wr_queue(c3cn);
- reset_wr_list(c3cn);
+ 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->l2t) {
- l2t_release(L2DATA(cdev), c3cn->l2t);
- c3cn->l2t = NULL;
+ err = -EPIPE;
+ if (c3cn->err) {
+ c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
+ goto out_err;
}
- if (c3cn->state == C3CN_STATE_SYN_SENT) /* we have ATID */
- free_atid(cdev, tid);
- else { /* we have TID */
- cxgb3_remove_tid(cdev, (void *)c3cn, tid);
- c3cn_put(c3cn);
+ 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;
- c3cn->cdev = NULL;
+out_err:
+ if (copied == 0 && err == -EPIPE)
+ copied = c3cn->err ? c3cn->err : -EPIPE;
+ goto done;
}
-/*
- * Handles Rx data that arrives in a state where the connection isn't
- * accepting new data.
- */
-static void handle_excess_rx(struct s3_conn *c3cn, struct sk_buff *skb)
+static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
{
- if (!c3cn_flag(c3cn, C3CN_ABORT_SHUTDOWN))
- abort_conn(c3cn, skb);
+ struct adap_ports *ports = &cdata->ports;
+ int i;
- kfree_skb(skb);
+ for (i = 0; i < ports->nports; i++)
+ NDEV2CDATA(ports->lldevs[i]) = NULL;
+ cxgb3i_free_big_mem(cdata);
}
-/*
- * Like get_cpl_reply_skb() but the returned buffer starts out empty.
- */
-static struct sk_buff *__get_cpl_reply_skb(struct sk_buff *skb, size_t len,
- gfp_t gfp)
+void cxgb3i_sdev_cleanup(void)
{
- if (likely(!skb_cloned(skb) && !skb->data_len)) {
- __skb_trim(skb, 0);
- skb_get(skb);
- } else
- skb = alloc_skb(len, gfp);
- return skb;
+ 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);
}
-/*
- * Completes some final bits of initialization for just established connections
- * and changes their state to C3CN_STATE_ESTABLISHED.
- *
- * snd_isn here is the ISN after the SYN, i.e., the true ISN + 1.
+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
*/
-static void make_established(struct s3_conn *c3cn, u32 snd_isn,
- unsigned int opt)
+void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
{
- c3cn_conn_debug("c3cn 0x%p, state 0x%x.\n", c3cn, c3cn->state);
+ struct cxgb3i_sdev_data *cdata;
+ struct ofld_page_info rx_page_info;
+ unsigned int wr_len;
+ int mapsize = DIV_ROUND_UP(cxgb3_max_connect,
+ 8 * sizeof(unsigned long));
+ int i;
- c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
+ cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
+ if (!cdata)
+ return;
- /*
- * 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);
+ 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)
+ goto free_cdata;
- dst_confirm(c3cn->dst_cache);
+ s3_init_wr_tab(wr_len);
- smp_mb();
- c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
+ 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);
+
+ 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);
+
+ write_lock(&cdata_rwlock);
+ list_del(&cdata->list);
+ write_unlock(&cdata_rwlock);
+
+ sdev_data_cleanup(cdata);
}
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.h b/drivers/scsi/cxgb3i/cxgb3i_offload.h
index 0151989..5b93d62 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.h
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.h
@@ -1,12 +1,15 @@
/*
- * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
+ * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
*
- * Written by Dimitris Michailidis (dm@xxxxxxxxxxx)
+ * 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@xxxxxxxxxxx)
+ * Karen Xie (kxie@xxxxxxxxxxx)
*/
#ifndef _CXGB3I_OFFLOAD_H
@@ -23,83 +26,104 @@
#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
-
-#ifdef __DEBUG_CXGB3I__
#define cxgb3i_log_debug(fmt, args...) \
printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
-#else
-#define cxgb3i_log_debug(fmt...)
-#endif
-#ifdef __DEBUG_C3CN_CONN__
-#define c3cn_conn_debug cxgb3i_log_debug
-#else
-#define c3cn_conn_debug(fmt...)
-#endif
-
-/*
- * Data structure to keep track of cxgb3 connection.
+/**
+ * struct s3_conn - an iscsi tcp connection structure
+ *
+ * @dev: net device of with connection
+ * @cdev: adapter t3cdev for net device
+ * @flags: see c3cn_flags below
+ * @tid: connection id assigned by the h/w
+ * @qset: queue set used by connection
+ * @mss_idx: Maximum Segment Size table index
+ * @l2t: ARP resolution entry for offload packets
+ * @wr_max: maximum in-flight writes
+ * @wr_avail: number of writes available
+ * @wr_unacked: writes since last request for completion notification
+ * @wr_pending_head: head of pending write queue
+ * @wr_pending_tail: tail of pending write queue
+ * @cpl_close: skb for cpl_close_req
+ * @cpl_abort_req: skb for cpl_abort_req
+ * @cpl_abort_rpl: skb for cpl_abort_rpl
+ * @lock: connection status lock
+ * @refcnt: reference count on connection
+ * @state: connection state
+ * @saddr: source ip/port address
+ * @daddr: destination ip/port address
+ * @dst_cache: reference to destination route
+ * @receive_queue: received PDUs
+ * @write_queue: un-pushed pending writes
+ * @retry_timer: retry timer for various operations
+ * @err: connection error status
+ * @callback_lock: lock for opaque user context
+ * @user_data: opaque user context
+ * @rcv_nxt: next receive seq. #
+ * @copied_seq: head of yet unread data
+ * @rcv_wup: rcv_nxt on last window update sent
+ * @snd_nxt: next sequence we send
+ * @snd_una: first byte we want an ack for
+ * @write_seq: tail+1 of data held in send buffer
*/
struct s3_conn {
- struct net_device *dev; /* net device of with connection */
- struct t3cdev *cdev; /* adapter t3cdev for net device */
- unsigned long flags; /* see c3cn_flags below */
- int tid; /* ID of TCP Control Block */
- int qset; /* queue Set used by connection */
- int mss_idx; /* Maximum Segment Size table index */
- struct l2t_entry *l2t; /* ARP resolution for offload packets */
- int wr_max; /* maximum in-flight writes */
- int wr_avail; /* number of writes available */
- int wr_unacked; /* writes since last request for */
- /* completion notification */
- struct sk_buff *wr_pending_head;/* head of pending write queue */
- struct sk_buff *wr_pending_tail;/* tail of pending write queue */
- struct sk_buff *ctrl_skb_cache; /* single entry cached skb for */
- /* short-term control operations */
- spinlock_t lock; /* connection status lock */
- atomic_t refcnt; /* reference count on connection */
- volatile unsigned int state; /* connection state */
- struct sockaddr_in saddr; /* source IP/port address */
- struct sockaddr_in daddr; /* destination IP/port address */
- struct dst_entry *dst_cache; /* reference to destination route */
- unsigned char shutdown; /* shutdown status */
- struct sk_buff_head receive_queue;/* received PDUs */
- struct sk_buff_head write_queue;/* un-pushed pending writes */
-
- struct timer_list retry_timer; /* retry timer for various operations */
- int err; /* connection error status */
- rwlock_t callback_lock; /* lock for opaque user context */
- void *user_data; /* opaque user context */
-
- u32 rcv_nxt; /* what we want to receive next */
- u32 copied_seq; /* head of yet unread data */
- u32 rcv_wup; /* rcv_nxt on last window update sent */
- u32 snd_nxt; /* next sequence we send */
- u32 snd_una; /* first byte we want an ack for */
-
- u32 write_seq; /* tail+1 of data held in send buffer */
+ struct net_device *dev;
+ struct t3cdev *cdev;
+ unsigned long flags;
+ int tid;
+ int qset;
+ int mss_idx;
+ struct l2t_entry *l2t;
+ int wr_max;
+ int wr_avail;
+ int wr_unacked;
+ struct sk_buff *wr_pending_head;
+ struct sk_buff *wr_pending_tail;
+ struct sk_buff *cpl_close;
+ struct sk_buff *cpl_abort_req;
+ struct sk_buff *cpl_abort_rpl;
+ spinlock_t lock;
+ atomic_t refcnt;
+ volatile unsigned int state;
+ struct sockaddr_in saddr;
+ struct sockaddr_in daddr;
+ struct dst_entry *dst_cache;
+ struct sk_buff_head receive_queue;
+ struct sk_buff_head write_queue;
+ struct timer_list retry_timer;
+ int err;
+ rwlock_t callback_lock;
+ void *user_data;
+
+ u32 rcv_nxt;
+ u32 copied_seq;
+ u32 rcv_wup;
+ u32 snd_nxt;
+ u32 snd_una;
+ u32 write_seq;
};
-/* Flags in c3cn->shutdown */
-#define C3CN_RCV_SHUTDOWN 0x1
-#define C3CN_SEND_SHUTDOWN 0x2
-#define C3CN_SHUTDOWN_MASK (C3CN_RCV_SHUTDOWN | C3CN_SEND_SHUTDOWN)
-
/*
- * connection state bitmap
+ * connection state
*/
-#define C3CN_STATE_CLOSE 0x1
-#define C3CN_STATE_SYN_SENT 0x2
-#define C3CN_STATE_ESTABLISHED 0x4
-#define C3CN_STATE_CLOSING 0x8
-#define C3CN_STATE_ABORING 0x10
-
-#define C3CN_STATE_MASK 0xFF
+enum conn_states {
+ C3CN_STATE_CONNECTING = 1,
+ C3CN_STATE_ESTABLISHED,
+ C3CN_STATE_ACTIVE_CLOSE,
+ C3CN_STATE_PASSIVE_CLOSE,
+ C3CN_STATE_CLOSE_WAIT_1,
+ C3CN_STATE_CLOSE_WAIT_2,
+ C3CN_STATE_ABORTING,
+ C3CN_STATE_CLOSED,
+};
-static inline unsigned int c3cn_in_state(const struct s3_conn *c3cn,
- unsigned int states)
+static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
{
- return states & c3cn->state;
+ return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
+}
+static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
+{
+ return c3cn->state == C3CN_STATE_ESTABLISHED;
}
/*
@@ -108,37 +132,35 @@ static inline unsigned int c3cn_in_state(const struct s3_conn *c3cn,
enum c3cn_flags {
C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
- C3CN_TX_WAIT_IDLE, /* suspend Tx until in-flight data is ACKed */
- C3CN_ABORT_SHUTDOWN, /* shouldn't send more abort requests */
-
C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
- C3CN_CLOSE_CON_REQUESTED, /* we've sent a close_conn_req */
C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
- C3CN_CLOSE_NEEDED, /* need to be closed */
- C3CN_DONE,
+ C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
};
-/*
- * Per adapter data. Linked off of each Ethernet device port on the adapter.
+/**
+ * cxgb3i_sdev_data - Per adapter data.
+ * Linked off of each Ethernet device port on the adapter.
* Also available via the t3cdev structure since we have pointers to our port
* net_device's there ...
+ *
+ * @list: list head to link elements
+ * @cdev: t3cdev adapter
+ * @client: CPL client pointer
+ * @ports: array of adapter ports
+ * @sport_map_next: next index into the port map
+ * @sport_map: source port map
*/
struct cxgb3i_sdev_data {
- struct list_head list; /* links for list of all adapters */
- struct t3cdev *cdev; /* adapter t3cdev */
- struct cxgb3_client *client; /* CPL client pointer */
- struct adap_ports *ports; /* array of adapter ports */
- unsigned int rx_page_size; /* RX page size */
- struct sk_buff_head deferq; /* queue for processing replies from */
- /* worker thread context */
- struct work_struct deferq_task; /* worker thread */
+ struct list_head list;
+ struct t3cdev *cdev;
+ struct cxgb3_client *client;
+ struct adap_ports ports;
+ unsigned int sport_map_next;
+ unsigned long sport_map[0];
};
#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
-/*
- * Primary API routines.
- */
void cxgb3i_sdev_cleanup(void);
int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
@@ -147,20 +169,26 @@ void cxgb3i_sdev_remove(struct t3cdev *);
struct s3_conn *cxgb3i_c3cn_create(void);
int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
-int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *, int);
+int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
void cxgb3i_c3cn_release(struct s3_conn *);
-/*
- * Definitions for sk_buff state and ULP mode management.
+/**
+ * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
+ *
+ * @flag: see C3CB_FLAG_* below
+ * @ulp_mode: ULP mode/submode of sk_buff
+ * @seq: tcp sequence number
+ * @ddigest: pdu data digest
+ * @pdulen: recovered pdu length
+ * @ulp_data: scratch area for ULP
*/
-
struct cxgb3_skb_cb {
- __u8 flags; /* see C3CB_FLAG_* below */
- __u8 ulp_mode; /* ULP mode/submode of sk_buff */
- __u32 seq; /* sequence number */
- __u32 ddigest; /* ULP rx_data_ddp selected field */
- __u32 pdulen; /* ULP rx_data_ddp selected field */
- __u8 ulp_data[16]; /* scratch area for ULP */
+ __u8 flags;
+ __u8 ulp_mode;
+ __u32 seq;
+ __u32 ddigest;
+ __u32 pdulen;
+ __u8 ulp_data[16];
};
#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
@@ -170,28 +198,14 @@ struct cxgb3_skb_cb {
#define skb_ulp_pdulen(skb) (CXGB3_SKB_CB(skb)->pdulen)
#define skb_ulp_data(skb) (CXGB3_SKB_CB(skb)->ulp_data)
-enum {
+enum c3cb_flags {
C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
- C3CB_FLAG_BARRIER = 1 << 2, /* set TX_WAIT_IDLE after sending */
- C3CB_FLAG_COMPL = 1 << 4, /* request WR completion */
+ C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
};
-/*
- * 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(&c3cn->lock);
- fn(c3cn, skb);
- spin_unlock(&c3cn->lock);
-}
-
-/*
+/**
+ * sge_opaque_hdr -
* Opaque version of structure the SGE stores at skb->head of TX_DATA packets
* and for which we must reserve space.
*/
@@ -204,9 +218,6 @@ struct sge_opaque_hdr {
#define TX_HEADER_LEN \
(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
-void *cxgb3i_alloc_big_mem(unsigned int);
-void cxgb3i_free_big_mem(void *);
-
/*
* get and set private ip for iscsi traffic
*/
--
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