[SCSI] cxgb3i: close all tcp connections upon chip reset

Keep track of offloaded tcp connections per adapter. Close all of the
connections upon reset.

Signed-off-by: Karen Xie <kxie@chelsio.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 71 insertions, 41 deletions

diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c
index c2e434e54e2..4d8654cdbda 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.c
@@ -94,29 +94,30 @@ static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
         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;
+        if (c3cn->saddr.sin_port) {
+                cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n",
+                                 c3cn->saddr.sin_port);
+                return -EADDRINUSE;
         }
 
-        /* the sport_map_next may not be accurate but that is okay, sport_map
-           should be */
-        start = idx = cdata->sport_map_next;
+        spin_lock_bh(&cdata->lock);
+        start = idx = cdata->sport_next;
         do {
                 if (++idx >= cxgb3_max_connect)
                         idx = 0;
-                if (!(test_and_set_bit(idx, cdata->sport_map))) {
+                if (!cdata->sport_conn[idx]) {
                         c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
-                        cdata->sport_map_next = idx;
+                        cdata->sport_next = idx;
+                        cdata->sport_conn[idx] = c3cn;
+                        spin_unlock_bh(&cdata->lock);
+
                         c3cn_conn_debug("%s reserve port %u.\n",
                                         cdata->cdev->name,
                                         cxgb3_sport_base + idx);
                         return 0;
                 }
         } while (idx != start);
+        spin_unlock_bh(&cdata->lock);
 
 error_out:
         return -EADDRNOTAVAIL;
@@ -124,15 +125,19 @@ error_out:
 
 static void c3cn_put_port(struct s3_conn *c3cn)
 {
-        struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
+        if (!c3cn->cdev)
+                return;
 
         if (c3cn->saddr.sin_port) {
+                struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
                 int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
 
                 c3cn->saddr.sin_port = 0;
                 if (idx < 0 || idx >= cxgb3_max_connect)
                         return;
-                clear_bit(idx, cdata->sport_map);
+                spin_lock_bh(&cdata->lock);
+                cdata->sport_conn[idx] = NULL;
+                spin_unlock_bh(&cdata->lock);
                 c3cn_conn_debug("%s, release port %u.\n",
                                 cdata->cdev->name, cxgb3_sport_base + idx);
         }
@@ -1305,11 +1310,7 @@ static void c3cn_release_offload_resources(struct s3_conn *c3cn)
         struct t3cdev *cdev = c3cn->cdev;
         unsigned int tid = c3cn->tid;
 
-        if (!cdev)
-                return;
-
         c3cn->qset = 0;
-
         c3cn_free_cpl_skbs(c3cn);
 
         if (c3cn->wr_avail != c3cn->wr_max) {
@@ -1317,18 +1318,22 @@ static void c3cn_release_offload_resources(struct s3_conn *c3cn)
                 reset_wr_list(c3cn);
         }
 
-        if (c3cn->l2t) {
-                l2t_release(L2DATA(cdev), c3cn->l2t);
-                c3cn->l2t = NULL;
-        }
-
-        if (c3cn->state == C3CN_STATE_CONNECTING) /* we have ATID */
-                s3_free_atid(cdev, tid);
-        else {          /* we have TID */
-                cxgb3_remove_tid(cdev, (void *)c3cn, tid);
-                c3cn_put(c3cn);
+        if (cdev) {
+                if (c3cn->l2t) {
+                        l2t_release(L2DATA(cdev), c3cn->l2t);
+                        c3cn->l2t = NULL;
+                }
+                if (c3cn->state == C3CN_STATE_CONNECTING)
+                        /* we have ATID */
+                        s3_free_atid(cdev, tid);
+                else {
+                        /* we have TID */
+                        cxgb3_remove_tid(cdev, (void *)c3cn, tid);
+                        c3cn_put(c3cn);
+                }
         }
 
+        c3cn->dst_cache = NULL;
         c3cn->cdev = NULL;
 }
 
@@ -1417,17 +1422,18 @@ static void c3cn_active_close(struct s3_conn *c3cn)
 }
 
 /**
- * cxgb3i_c3cn_release - close and release an iscsi tcp connection
+ * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
+ *      resource held
  * @c3cn: the iscsi tcp connection
  */
 void cxgb3i_c3cn_release(struct s3_conn *c3cn)
 {
         c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
                         c3cn, c3cn->state, c3cn->flags);
-        if (likely(c3cn->state != C3CN_STATE_CONNECTING))
-                c3cn_active_close(c3cn);
-        else
+        if (unlikely(c3cn->state == C3CN_STATE_CONNECTING))
                 c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
+        else if (likely(c3cn->state != C3CN_STATE_CLOSED))
+                c3cn_active_close(c3cn);
         c3cn_put(c3cn);
 }
 
@@ -1656,7 +1662,6 @@ int cxgb3i_c3cn_connect(struct s3_conn *c3cn, struct sockaddr_in *usin)
         c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
         ip_rt_put(rt);
         c3cn_put_port(c3cn);
-        c3cn->daddr.sin_port = 0;
         return err;
 }
 
@@ -1776,10 +1781,25 @@ out_err:
 static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
 {
         struct adap_ports *ports = &cdata->ports;
+        struct s3_conn *c3cn;
         int i;
 
+        for (i = 0; i < cxgb3_max_connect; i++) {
+                if (cdata->sport_conn[i]) {
+                        c3cn = cdata->sport_conn[i];
+                        cdata->sport_conn[i] = NULL;
+
+                        spin_lock_bh(&c3cn->lock);
+                        c3cn->cdev = NULL;
+                        c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN);
+                        c3cn_closed(c3cn);
+                        spin_unlock_bh(&c3cn->lock);
+                }
+        }
+
         for (i = 0; i < ports->nports; i++)
                 NDEV2CDATA(ports->lldevs[i]) = NULL;
+
         cxgb3i_free_big_mem(cdata);
 }
 
@@ -1821,21 +1841,27 @@ void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
         struct cxgb3i_sdev_data *cdata;
         struct ofld_page_info rx_page_info;
         unsigned int wr_len;
-        int mapsize = DIV_ROUND_UP(cxgb3_max_connect,
-                                   8 * sizeof(unsigned long));
+        int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *);
         int i;
 
         cdata =  cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
-        if (!cdata)
+        if (!cdata) {
+                cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n",
+                                cdev, mapsize);
                 return;
+        }
 
         if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
             cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
-            cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0)
+            cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
+                cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n",
+                                cdev);
                 goto free_cdata;
+        }
 
         s3_init_wr_tab(wr_len);
 
+        spin_lock_init(&cdata->lock);
         INIT_LIST_HEAD(&cdata->list);
         cdata->cdev = cdev;
         cdata->client = client;
@@ -1847,6 +1873,7 @@ void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
         list_add_tail(&cdata->list, &cdata_list);
         write_unlock(&cdata_rwlock);
 
+        cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev);
         return;
 
 free_cdata:
@@ -1861,6 +1888,8 @@ void cxgb3i_sdev_remove(struct t3cdev *cdev)
 {
         struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
 
+        cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev);
+
         write_lock(&cdata_rwlock);
         list_del(&cdata->list);
         write_unlock(&cdata_rwlock);
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.h b/drivers/scsi/cxgb3i/cxgb3i_offload.h
index 275f23f16eb..dab759d67be 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_offload.h
+++ b/drivers/scsi/cxgb3i/cxgb3i_offload.h
@@ -135,11 +135,11 @@ enum c3cn_flags {
         C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
         C3CN_TX_DATA_SENT,      /* already sent a TX_DATA WR */
         C3CN_ACTIVE_CLOSE_NEEDED,       /* need to be closed */
+        C3CN_OFFLOAD_DOWN       /* offload function off */
 };
 
 /**
  * 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 ...
@@ -148,16 +148,17 @@ enum c3cn_flags {
  * @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
+ * @sport_next: next port
+ * @sport_conn: source port connection
  */
 struct cxgb3i_sdev_data {
         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];
+        spinlock_t lock;
+        unsigned int sport_next;
+        struct s3_conn *sport_conn[0];
 };
 #define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
 #define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)