diff options
Diffstat (limited to 'drivers/scsi/cxgb3i/cxgb3i_offload.c')
| -rw-r--r-- | drivers/scsi/cxgb3i/cxgb3i_offload.c | 1944 |
1 files changed, 0 insertions, 1944 deletions
diff --git a/drivers/scsi/cxgb3i/cxgb3i_offload.c b/drivers/scsi/cxgb3i/cxgb3i_offload.c deleted file mode 100644 index 3ee13cf9556b..000000000000 --- a/drivers/scsi/cxgb3i/cxgb3i_offload.c +++ /dev/null @@ -1,1944 +0,0 @@ -/* - * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management - * - * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this - * release for licensing terms and conditions. - * - * Written by: Dimitris Michailidis (dm@chelsio.com) - * Karen Xie (kxie@chelsio.com) - */ - -#include <linux/if_vlan.h> -#include <linux/slab.h> -#include <linux/version.h> - -#include "cxgb3_defs.h" -#include "cxgb3_ctl_defs.h" -#include "firmware_exports.h" -#include "cxgb3i_offload.h" -#include "cxgb3i_pdu.h" -#include "cxgb3i_ddp.h" - -#ifdef __DEBUG_C3CN_CONN__ -#define c3cn_conn_debug cxgb3i_log_debug -#else -#define c3cn_conn_debug(fmt...) -#endif - -#ifdef __DEBUG_C3CN_TX__ -#define c3cn_tx_debug cxgb3i_log_debug -#else -#define c3cn_tx_debug(fmt...) -#endif - -#ifdef __DEBUG_C3CN_RX__ -#define c3cn_rx_debug cxgb3i_log_debug -#else -#define c3cn_rx_debug(fmt...) -#endif - -/* - * module parameters releated to offloaded iscsi connection - */ -static int cxgb3_rcv_win = 256 * 1024; -module_param(cxgb3_rcv_win, int, 0644); -MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)"); - -static int cxgb3_snd_win = 128 * 1024; -module_param(cxgb3_snd_win, int, 0644); -MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)"); - -static int cxgb3_rx_credit_thres = 10 * 1024; -module_param(cxgb3_rx_credit_thres, int, 0644); -MODULE_PARM_DESC(rx_credit_thres, - "RX credits return threshold in bytes (default=10KB)"); - -static unsigned int cxgb3_max_connect = 8 * 1024; -module_param(cxgb3_max_connect, uint, 0644); -MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)"); - -static unsigned int cxgb3_sport_base = 20000; -module_param(cxgb3_sport_base, uint, 0644); -MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)"); - -/* - * cxgb3i tcp connection data(per adapter) list - */ -static LIST_HEAD(cdata_list); -static DEFINE_RWLOCK(cdata_rwlock); - -static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion); -static void c3cn_release_offload_resources(struct s3_conn *c3cn); - -/* - * iscsi source port management - * - * Find a free source port in the port allocation map. We use a very simple - * rotor scheme to look for the next free port. - * - * If a source port has been specified make sure that it doesn't collide with - * our normal source port allocation map. If it's outside the range of our - * allocation/deallocation scheme just let them use it. - * - * If the source port is outside our allocation range, the caller is - * responsible for keeping track of their port usage. - */ -static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata) -{ - unsigned int start; - int idx; - - if (!cdata) - goto error_out; - - if (c3cn->saddr.sin_port) { - cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n", - c3cn->saddr.sin_port); - return -EADDRINUSE; - } - - spin_lock_bh(&cdata->lock); - start = idx = cdata->sport_next; - do { - if (++idx >= cxgb3_max_connect) - idx = 0; - if (!cdata->sport_conn[idx]) { - c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx); - cdata->sport_next = idx; - cdata->sport_conn[idx] = c3cn; - spin_unlock_bh(&cdata->lock); - - c3cn_conn_debug("%s reserve port %u.\n", - cdata->cdev->name, - cxgb3_sport_base + idx); - return 0; - } - } while (idx != start); - spin_unlock_bh(&cdata->lock); - -error_out: - return -EADDRNOTAVAIL; -} - -static void c3cn_put_port(struct s3_conn *c3cn) -{ - if (!c3cn->cdev) - return; - - if (c3cn->saddr.sin_port) { - struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev); - int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base; - - c3cn->saddr.sin_port = 0; - if (idx < 0 || idx >= cxgb3_max_connect) - return; - spin_lock_bh(&cdata->lock); - cdata->sport_conn[idx] = NULL; - spin_unlock_bh(&cdata->lock); - c3cn_conn_debug("%s, release port %u.\n", - cdata->cdev->name, cxgb3_sport_base + idx); - } -} - -static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag) -{ - __set_bit(flag, &c3cn->flags); - c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n", - c3cn, flag, c3cn->state, c3cn->flags); -} - -static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag) -{ - __clear_bit(flag, &c3cn->flags); - c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n", - c3cn, flag, c3cn->state, c3cn->flags); -} - -static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag) -{ - if (c3cn == NULL) - return 0; - return test_bit(flag, &c3cn->flags); -} - -static void c3cn_set_state(struct s3_conn *c3cn, int state) -{ - c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state); - c3cn->state = state; -} - -static inline void c3cn_hold(struct s3_conn *c3cn) -{ - atomic_inc(&c3cn->refcnt); -} - -static inline void c3cn_put(struct s3_conn *c3cn) -{ - if (atomic_dec_and_test(&c3cn->refcnt)) { - c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - kfree(c3cn); - } -} - -static void c3cn_closed(struct s3_conn *c3cn) -{ - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - c3cn_put_port(c3cn); - c3cn_release_offload_resources(c3cn); - c3cn_set_state(c3cn, C3CN_STATE_CLOSED); - cxgb3i_conn_closing(c3cn); -} - -/* - * CPL (Chelsio Protocol Language) defines a message passing interface between - * the host driver and T3 asic. - * The section below implments CPLs that related to iscsi tcp connection - * open/close/abort and data send/receive. - */ - -/* - * CPL connection active open request: host -> - */ -static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu) -{ - int i = 0; - - while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu) - ++i; - return i; -} - -static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu) -{ - unsigned int idx; - struct dst_entry *dst = c3cn->dst_cache; - struct t3cdev *cdev = c3cn->cdev; - const struct t3c_data *td = T3C_DATA(cdev); - u16 advmss = dst_metric(dst, RTAX_ADVMSS); - - if (advmss > pmtu - 40) - advmss = pmtu - 40; - if (advmss < td->mtus[0] - 40) - advmss = td->mtus[0] - 40; - idx = find_best_mtu(td, advmss + 40); - return idx; -} - -static inline int compute_wscale(int win) -{ - int wscale = 0; - while (wscale < 14 && (65535<<wscale) < win) - wscale++; - return wscale; -} - -static inline unsigned int calc_opt0h(struct s3_conn *c3cn) -{ - int wscale = compute_wscale(cxgb3_rcv_win); - return V_KEEP_ALIVE(1) | - F_TCAM_BYPASS | - V_WND_SCALE(wscale) | - V_MSS_IDX(c3cn->mss_idx); -} - -static inline unsigned int calc_opt0l(struct s3_conn *c3cn) -{ - return V_ULP_MODE(ULP_MODE_ISCSI) | - V_RCV_BUFSIZ(cxgb3_rcv_win>>10); -} - -static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb, - unsigned int atid, const struct l2t_entry *e) -{ - struct cpl_act_open_req *req; - - c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid); - - skb->priority = CPL_PRIORITY_SETUP; - req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req)); - req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); - req->wr.wr_lo = 0; - 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; - req->opt2 = 0; -} - -static void fail_act_open(struct s3_conn *c3cn, int errno) -{ - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - c3cn->err = errno; - c3cn_closed(c3cn); -} - -static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb) -{ - struct s3_conn *c3cn = (struct s3_conn *)skb->sk; - - c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); - - c3cn_hold(c3cn); - spin_lock_bh(&c3cn->lock); - if (c3cn->state == C3CN_STATE_CONNECTING) - fail_act_open(c3cn, -EHOSTUNREACH); - spin_unlock_bh(&c3cn->lock); - c3cn_put(c3cn); - __kfree_skb(skb); -} - -/* - * CPL connection close request: host -> - * - * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to - * the write queue (i.e., after any unsent txt data). - */ -static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb, - int flags) -{ - skb_tcp_seq(skb) = c3cn->write_seq; - skb_flags(skb) = flags; - __skb_queue_tail(&c3cn->write_queue, skb); -} - -static void send_close_req(struct s3_conn *c3cn) -{ - struct sk_buff *skb = c3cn->cpl_close; - struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head; - unsigned int tid = c3cn->tid; - - c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - c3cn->cpl_close = NULL; - - req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON)); - req->wr.wr_lo = htonl(V_WR_TID(tid)); - OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid)); - req->rsvd = htonl(c3cn->write_seq); - - skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND); - if (c3cn->state != C3CN_STATE_CONNECTING) - c3cn_push_tx_frames(c3cn, 1); -} - -/* - * CPL connection abort request: host -> - * - * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs - * for the same connection and also that we do not try to send a message - * after the connection has closed. - */ -static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb) -{ - struct cpl_abort_req *req = cplhdr(skb); - - c3cn_conn_debug("tdev 0x%p.\n", cdev); - - req->cmd = CPL_ABORT_NO_RST; - cxgb3_ofld_send(cdev, skb); -} - -static inline void c3cn_purge_write_queue(struct s3_conn *c3cn) -{ - struct sk_buff *skb; - - while ((skb = __skb_dequeue(&c3cn->write_queue))) - __kfree_skb(skb); -} - -static void send_abort_req(struct s3_conn *c3cn) -{ - struct sk_buff *skb = c3cn->cpl_abort_req; - struct cpl_abort_req *req; - unsigned int tid = c3cn->tid; - - if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb || - !c3cn->cdev) - return; - - c3cn_set_state(c3cn, C3CN_STATE_ABORTING); - - c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn); - - c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING); - - /* Purge the send queue so we don't send anything after an abort. */ - c3cn_purge_write_queue(c3cn); - - c3cn->cpl_abort_req = NULL; - req = (struct cpl_abort_req *)skb->head; - memset(req, 0, sizeof(*req)); - - skb->priority = CPL_PRIORITY_DATA; - set_arp_failure_handler(skb, abort_arp_failure); - - req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ)); - req->wr.wr_lo = htonl(V_WR_TID(tid)); - OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid)); - req->rsvd0 = htonl(c3cn->snd_nxt); - req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT); - req->cmd = CPL_ABORT_SEND_RST; - - l2t_send(c3cn->cdev, skb, c3cn->l2t); -} - -/* - * CPL connection abort reply: host -> - * - * Send an ABORT_RPL message in response of the ABORT_REQ received. - */ -static void send_abort_rpl(struct s3_conn *c3cn, int rst_status) -{ - struct sk_buff *skb = c3cn->cpl_abort_rpl; - struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head; - - c3cn->cpl_abort_rpl = NULL; - - skb->priority = CPL_PRIORITY_DATA; - memset(rpl, 0, sizeof(*rpl)); - rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL)); - rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid)); - OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid)); - rpl->cmd = rst_status; - - cxgb3_ofld_send(c3cn->cdev, skb); -} - -/* - * CPL connection rx data ack: host -> - * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of - * credits sent. - */ -static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack) -{ - struct sk_buff *skb; - struct cpl_rx_data_ack *req; - - skb = alloc_skb(sizeof(*req), GFP_ATOMIC); - if (!skb) - return 0; - - req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req)); - req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD)); - req->wr.wr_lo = 0; - OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid)); - req->credit_dack = htonl(dack | V_RX_CREDITS(credits)); - skb->priority = CPL_PRIORITY_ACK; - cxgb3_ofld_send(c3cn->cdev, skb); - return credits; -} - -/* - * CPL connection tx data: host -> - * - * Send iscsi PDU via TX_DATA CPL message. Returns the number of - * credits sent. - * Each TX_DATA consumes work request credit (wrs), so we need to keep track of - * how many we've used so far and how many are pending (i.e., yet ack'ed by T3). - */ - -/* - * For ULP connections HW may inserts digest bytes into the pdu. Those digest - * bytes are not sent by the host but are part of the TCP payload and therefore - * consume TCP sequence space. - */ -static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 }; -static inline unsigned int ulp_extra_len(const struct sk_buff *skb) -{ - return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3]; -} - -static unsigned int wrlen __read_mostly; - -/* - * The number of WRs needed for an skb depends on the number of fragments - * in the skb and whether it has any payload in its main body. This maps the - * length of the gather list represented by an skb into the # of necessary WRs. - * The extra two fragments are for iscsi bhs and payload padding. - */ -#define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2) -static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly; - -static void s3_init_wr_tab(unsigned int wr_len) -{ - int i; - - if (skb_wrs[1]) /* already initialized */ - return; - - for (i = 1; i < SKB_WR_LIST_SIZE; i++) { - int sgl_len = (3 * i) / 2 + (i & 1); - - sgl_len += 3; - skb_wrs[i] = (sgl_len <= wr_len - ? 1 : 1 + (sgl_len - 2) / (wr_len - 1)); - } - - wrlen = wr_len * 8; -} - -static inline void reset_wr_list(struct s3_conn *c3cn) -{ - c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL; -} - -/* - * Add a WR to a connections's list of pending WRs. This is a singly-linked - * list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head - * and the tail in wr_pending_tail. - */ -static inline void enqueue_wr(struct s3_conn *c3cn, - struct sk_buff *skb) -{ - skb_tx_wr_next(skb) = NULL; - - /* - * We want to take an extra reference since both us and the driver - * need to free the packet before it's really freed. We know there's - * just one user currently so we use atomic_set rather than skb_get - * to avoid the atomic op. - */ - atomic_set(&skb->users, 2); - - if (!c3cn->wr_pending_head) - c3cn->wr_pending_head = skb; - else - skb_tx_wr_next(c3cn->wr_pending_tail) = skb; - c3cn->wr_pending_tail = skb; -} - -static int count_pending_wrs(struct s3_conn *c3cn) -{ - int n = 0; - const struct sk_buff *skb = c3cn->wr_pending_head; - - while (skb) { - n += skb->csum; - skb = skb_tx_wr_next(skb); - } - return n; -} - -static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn) -{ - return c3cn->wr_pending_head; -} - -static inline void free_wr_skb(struct sk_buff *skb) -{ - kfree_skb(skb); -} - -static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn) -{ - struct sk_buff *skb = c3cn->wr_pending_head; - - if (likely(skb)) { - /* Don't bother clearing the tail */ - c3cn->wr_pending_head = skb_tx_wr_next(skb); - skb_tx_wr_next(skb) = NULL; - } - return skb; -} - -static void purge_wr_queue(struct s3_conn *c3cn) -{ - struct sk_buff *skb; - while ((skb = dequeue_wr(c3cn)) != NULL) - free_wr_skb(skb); -} - -static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb, - int len, int req_completion) -{ - struct tx_data_wr *req; - - skb_reset_transport_header(skb); - req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req)); - req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) | - (req_completion ? F_WR_COMPL : 0)); - req->wr_lo = htonl(V_WR_TID(c3cn->tid)); - req->sndseq = htonl(c3cn->snd_nxt); - /* len includes the length of any HW ULP additions */ - req->len = htonl(len); - req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx)); - /* V_TX_ULP_SUBMODE sets both the mode and submode */ - req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) | - V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1))); - - if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) { - req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT | - V_TX_CPU_IDX(c3cn->qset)); - /* Sendbuffer is in units of 32KB. */ - req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15)); - c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT); - } -} - -/** - * c3cn_push_tx_frames -- start transmit - * @c3cn: the offloaded connection - * @req_completion: request wr_ack or not - * - * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a - * connection's send queue and sends them on to T3. Must be called with the - * connection's lock held. Returns the amount of send buffer space that was - * freed as a result of sending queued data to T3. - */ -static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb) -{ - kfree_skb(skb); -} - -static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion) -{ - int total_size = 0; - struct sk_buff *skb; - struct t3cdev *cdev; - struct cxgb3i_sdev_data *cdata; - - if (unlikely(c3cn->state == C3CN_STATE_CONNECTING || - c3cn->state == C3CN_STATE_CLOSE_WAIT_1 || - c3cn->state >= C3CN_STATE_ABORTING)) { - c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n", - c3cn, c3cn->state); - return 0; - } - - cdev = c3cn->cdev; - cdata = CXGB3_SDEV_DATA(cdev); - - while (c3cn->wr_avail - && (skb = skb_peek(&c3cn->write_queue)) != NULL) { - int len = skb->len; /* length before skb_push */ - int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len); - int wrs_needed = skb_wrs[frags]; - - if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen) - wrs_needed = 1; - - WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1); - - if (c3cn->wr_avail < wrs_needed) { - c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, " - "wr %d < %u.\n", - c3cn, skb->len, skb->data_len, frags, - wrs_needed, c3cn->wr_avail); - break; - } - - __skb_unlink(skb, &c3cn->write_queue); - skb->priority = CPL_PRIORITY_DATA; - skb->csum = wrs_needed; /* remember this until the WR_ACK */ - c3cn->wr_avail -= wrs_needed; - c3cn->wr_unacked += wrs_needed; - enqueue_wr(c3cn, skb); - - c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, " - "wr %d, left %u, unack %u.\n", - c3cn, skb->len, skb->data_len, frags, - wrs_needed, c3cn->wr_avail, c3cn->wr_unacked); - - - if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) { - if ((req_completion && - c3cn->wr_unacked == wrs_needed) || - (skb_flags(skb) & C3CB_FLAG_COMPL) || - c3cn->wr_unacked >= c3cn->wr_max / 2) { - req_completion = 1; - c3cn->wr_unacked = 0; - } - len += ulp_extra_len(skb); - make_tx_data_wr(c3cn, skb, len, req_completion); - c3cn->snd_nxt += len; - skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR; - } - - total_size += skb->truesize; - set_arp_failure_handler(skb, arp_failure_discard); - l2t_send(cdev, skb, c3cn->l2t); - } - return total_size; -} - -/* - * process_cpl_msg: -> host - * Top-level CPL message processing used by most CPL messages that - * pertain to connections. - */ -static inline void process_cpl_msg(void (*fn)(struct s3_conn *, - struct sk_buff *), - struct s3_conn *c3cn, - struct sk_buff *skb) -{ - spin_lock_bh(&c3cn->lock); - fn(c3cn, skb); - spin_unlock_bh(&c3cn->lock); -} - -/* - * process_cpl_msg_ref: -> host - * Similar to process_cpl_msg() but takes an extra connection reference around - * the call to the handler. Should be used if the handler may drop a - * connection reference. - */ -static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *, - struct sk_buff *), - struct s3_conn *c3cn, - struct sk_buff *skb) -{ - c3cn_hold(c3cn); - process_cpl_msg(fn, c3cn, skb); - c3cn_put(c3cn); -} - -/* - * Process a CPL_ACT_ESTABLISH message: -> host - * Updates connection state from an active establish CPL message. Runs with - * the connection lock held. - */ - -static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid) -{ - struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid); - if (c3cn) - c3cn_put(c3cn); -} - -static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn, - unsigned int opt) -{ - c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); - - c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn; - - /* - * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't - * pass through opt0. - */ - if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10)) - c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10); - - dst_confirm(c3cn->dst_cache); - - smp_mb(); - - c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED); -} - -static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct cpl_act_establish *req = cplhdr(skb); - u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */ - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (unlikely(c3cn->state != C3CN_STATE_CONNECTING)) - cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n", - c3cn->tid, c3cn->state); - - c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn; - c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt)); - - __kfree_skb(skb); - - if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED))) - /* upper layer has requested closing */ - send_abort_req(c3cn); - else { - if (skb_queue_len(&c3cn->write_queue)) - c3cn_push_tx_frames(c3cn, 1); - cxgb3i_conn_tx_open(c3cn); - } -} - -static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb, - void *ctx) -{ - struct cpl_act_establish *req = cplhdr(skb); - unsigned int tid = GET_TID(req); - unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid)); - struct s3_conn *c3cn = ctx; - struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); - - c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", - tid, c3cn, c3cn->state, c3cn->flags); - - c3cn->tid = tid; - c3cn_hold(c3cn); - cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid); - s3_free_atid(cdev, atid); - - c3cn->qset = G_QNUM(ntohl(skb->csum)); - - process_cpl_msg(process_act_establish, c3cn, skb); - return 0; -} - -/* - * Process a CPL_ACT_OPEN_RPL message: -> host - * Handle active open failures. - */ -static int act_open_rpl_status_to_errno(int status) -{ - switch (status) { - case CPL_ERR_CONN_RESET: - return -ECONNREFUSED; - case CPL_ERR_ARP_MISS: - return -EHOSTUNREACH; - case CPL_ERR_CONN_TIMEDOUT: - return -ETIMEDOUT; - case CPL_ERR_TCAM_FULL: - return -ENOMEM; - case CPL_ERR_CONN_EXIST: - cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n"); - return -EADDRINUSE; - default: - return -EIO; - } -} - -static void act_open_retry_timer(unsigned long data) -{ - struct sk_buff *skb; - struct s3_conn *c3cn = (struct s3_conn *)data; - - c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state); - - spin_lock_bh(&c3cn->lock); - skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC); - if (!skb) - fail_act_open(c3cn, -ENOMEM); - else { - skb->sk = (struct sock *)c3cn; - set_arp_failure_handler(skb, act_open_req_arp_failure); - make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); - l2t_send(c3cn->cdev, skb, c3cn->l2t); - } - spin_unlock_bh(&c3cn->lock); - c3cn_put(c3cn); -} - -static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct cpl_act_open_rpl *rpl = cplhdr(skb); - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (rpl->status == CPL_ERR_CONN_EXIST && - c3cn->retry_timer.function != act_open_retry_timer) { - c3cn->retry_timer.function = act_open_retry_timer; - if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2)) - c3cn_hold(c3cn); - } else - fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status)); - __kfree_skb(skb); -} - -static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) -{ - struct s3_conn *c3cn = ctx; - struct cpl_act_open_rpl *rpl = cplhdr(skb); - - c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n", - rpl->status, c3cn, c3cn->state, c3cn->flags); - - if (rpl->status != CPL_ERR_TCAM_FULL && - rpl->status != CPL_ERR_CONN_EXIST && - rpl->status != CPL_ERR_ARP_MISS) - cxgb3_queue_tid_release(cdev, GET_TID(rpl)); - - process_cpl_msg_ref(process_act_open_rpl, c3cn, skb); - return 0; -} - -/* - * Process PEER_CLOSE CPL messages: -> host - * Handle peer FIN. - */ -static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb) -{ - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) - goto out; - - switch (c3cn->state) { - case C3CN_STATE_ESTABLISHED: - c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE); - break; - case C3CN_STATE_ACTIVE_CLOSE: - c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); - break; - case C3CN_STATE_CLOSE_WAIT_1: - c3cn_closed(c3cn); - break; - case C3CN_STATE_ABORTING: - break; - default: - cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n", - c3cn->cdev->name, c3cn->tid, c3cn->state); - } - - cxgb3i_conn_closing(c3cn); -out: - __kfree_skb(skb); -} - -static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) -{ - struct s3_conn *c3cn = ctx; - - c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - process_cpl_msg_ref(process_peer_close, c3cn, skb); - return 0; -} - -/* - * Process CLOSE_CONN_RPL CPL message: -> host - * Process a peer ACK to our FIN. - */ -static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct cpl_close_con_rpl *rpl = cplhdr(skb); - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */ - - if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) - goto out; - - switch (c3cn->state) { - case C3CN_STATE_ACTIVE_CLOSE: - c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1); - break; - case C3CN_STATE_CLOSE_WAIT_1: - case C3CN_STATE_CLOSE_WAIT_2: - c3cn_closed(c3cn); - break; - case C3CN_STATE_ABORTING: - break; - default: - cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n", - c3cn->cdev->name, c3cn->tid, c3cn->state); - } - -out: - kfree_skb(skb); -} - -static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb, - void *ctx) -{ - struct s3_conn *c3cn = ctx; - - c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - process_cpl_msg_ref(process_close_con_rpl, c3cn, skb); - return 0; -} - -/* - * Process ABORT_REQ_RSS CPL message: -> host - * Process abort requests. If we are waiting for an ABORT_RPL we ignore this - * request except that we need to reply to it. - */ - -static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason, - int *need_rst) -{ - switch (abort_reason) { - case CPL_ERR_BAD_SYN: /* fall through */ - case CPL_ERR_CONN_RESET: - return c3cn->state > C3CN_STATE_ESTABLISHED ? - -EPIPE : -ECONNRESET; - case CPL_ERR_XMIT_TIMEDOUT: - case CPL_ERR_PERSIST_TIMEDOUT: - case CPL_ERR_FINWAIT2_TIMEDOUT: - case CPL_ERR_KEEPALIVE_TIMEDOUT: - return -ETIMEDOUT; - default: - return -EIO; - } -} - -static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb) -{ - int rst_status = CPL_ABORT_NO_RST; - const struct cpl_abort_req_rss *req = cplhdr(skb); - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) { - c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD); - c3cn_set_state(c3cn, C3CN_STATE_ABORTING); - __kfree_skb(skb); - return; - } - - c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD); - send_abort_rpl(c3cn, rst_status); - - if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { - c3cn->err = - abort_status_to_errno(c3cn, req->status, &rst_status); - c3cn_closed(c3cn); - } -} - -static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) -{ - const struct cpl_abort_req_rss *req = cplhdr(skb); - struct s3_conn *c3cn = ctx; - - c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (req->status == CPL_ERR_RTX_NEG_ADVICE || - req->status == CPL_ERR_PERSIST_NEG_ADVICE) { - __kfree_skb(skb); - return 0; - } - - process_cpl_msg_ref(process_abort_req, c3cn, skb); - return 0; -} - -/* - * Process ABORT_RPL_RSS CPL message: -> host - * Process abort replies. We only process these messages if we anticipate - * them as the coordination between SW and HW in this area is somewhat lacking - * and sometimes we get ABORT_RPLs after we are done with the connection that - * originated the ABORT_REQ. - */ -static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb) -{ - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) { - if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD)) - c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD); - else { - c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD); - c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING); - if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) - cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n", - c3cn->cdev->name, c3cn->tid); - c3cn_closed(c3cn); - } - } - __kfree_skb(skb); -} - -static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) -{ - struct cpl_abort_rpl_rss *rpl = cplhdr(skb); - struct s3_conn *c3cn = ctx; - - c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n", - rpl->status, c3cn, c3cn ? c3cn->state : 0, - c3cn ? c3cn->flags : 0UL); - - /* - * Ignore replies to post-close aborts indicating that the abort was - * requested too late. These connections are terminated when we get - * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss - * arrives the TID is either no longer used or it has been recycled. - */ - if (rpl->status == CPL_ERR_ABORT_FAILED) - goto discard; - - /* - * Sometimes we've already closed the connection, e.g., a post-close - * abort races with ABORT_REQ_RSS, the latter frees the connection - * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED, - * but FW turns the ABORT_REQ into a regular one and so we get - * ABORT_RPL_RSS with status 0 and no connection. - */ - if (!c3cn) - goto discard; - - process_cpl_msg_ref(process_abort_rpl, c3cn, skb); - return 0; - -discard: - __kfree_skb(skb); - return 0; -} - -/* - * Process RX_ISCSI_HDR CPL message: -> host - * Handle received PDUs, the payload could be DDP'ed. If not, the payload - * follow after the bhs. - */ -static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb); - struct cpl_iscsi_hdr_norss data_cpl; - struct cpl_rx_data_ddp_norss ddp_cpl; - unsigned int hdr_len, data_len, status; - unsigned int len; - int err; - - if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) { - if (c3cn->state != C3CN_STATE_ABORTING) - send_abort_req(c3cn); - __kfree_skb(skb); - return; - } - - skb_tcp_seq(skb) = ntohl(hdr_cpl->seq); - skb_flags(skb) = 0; - - skb_reset_transport_header(skb); - __skb_pull(skb, sizeof(struct cpl_iscsi_hdr)); - - len = hdr_len = ntohs(hdr_cpl->len); - /* msg coalesce is off or not enough data received */ - if (skb->len <= hdr_len) { - cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n", - c3cn->cdev->name, c3cn->tid, - skb->len, hdr_len); - goto abort_conn; - } - - err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl, - sizeof(ddp_cpl)); - if (err < 0) - goto abort_conn; - - skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY; - skb_rx_pdulen(skb) = ntohs(ddp_cpl.len); - skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc); - status = ntohl(ddp_cpl.ddp_status); - - c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n", - skb, skb->len, skb_rx_pdulen(skb), status); - - if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT)) - skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR; - if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT)) - skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR; - if (status & (1 << RX_DDP_STATUS_PAD_SHIFT)) - skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR; - - if (skb->len > (hdr_len + sizeof(ddp_cpl))) { - err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl)); - if (err < 0) - goto abort_conn; - data_len = ntohs(data_cpl.len); - len += sizeof(data_cpl) + data_len; - } else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT)) - skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED; - - c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb); - __pskb_trim(skb, len); - __skb_queue_tail(&c3cn->receive_queue, skb); - cxgb3i_conn_pdu_ready(c3cn); - - return; - -abort_conn: - send_abort_req(c3cn); - __kfree_skb(skb); -} - -static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx) -{ - struct s3_conn *c3cn = ctx; - - process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb); - return 0; -} - -/* - * Process TX_DATA_ACK CPL messages: -> host - * Process an acknowledgment of WR completion. Advance snd_una and send the - * next batch of work requests from the write queue. - */ -static void check_wr_invariants(struct s3_conn *c3cn) -{ - int pending = count_pending_wrs(c3cn); - - if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max)) - cxgb3i_log_error("TID %u: credit imbalance: avail %u, " - "pending %u, total should be %u\n", - c3cn->tid, c3cn->wr_avail, pending, - c3cn->wr_max); -} - -static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct cpl_wr_ack *hdr = cplhdr(skb); - unsigned int credits = ntohs(hdr->credits); - u32 snd_una = ntohl(hdr->snd_una); - - c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n", - credits, c3cn->wr_avail, c3cn->wr_unacked, - c3cn->tid, c3cn->state); - - c3cn->wr_avail += credits; - if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail) - c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail; - - while (credits) { - struct sk_buff *p = peek_wr(c3cn); - - if (unlikely(!p)) { - cxgb3i_log_error("%u WR_ACK credits for TID %u with " - "nothing pending, state %u\n", - credits, c3cn->tid, c3cn->state); - break; - } - if (unlikely(credits < p->csum)) { - struct tx_data_wr *w = cplhdr(p); - cxgb3i_log_error("TID %u got %u WR credits need %u, " - "len %u, main body %u, frags %u, " - "seq # %u, ACK una %u, ACK nxt %u, " - "WR_AVAIL %u, WRs pending %u\n", - c3cn->tid, credits, p->csum, p->len, - p->len - p->data_len, - skb_shinfo(p)->nr_frags, - ntohl(w->sndseq), snd_una, - ntohl(hdr->snd_nxt), c3cn->wr_avail, - count_pending_wrs(c3cn) - credits); - p->csum -= credits; - break; - } else { - dequeue_wr(c3cn); - credits -= p->csum; - free_wr_skb(p); - } - } - - check_wr_invariants(c3cn); - - if (unlikely(before(snd_una, c3cn->snd_una))) { - cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK " - "snd_una %u\n", - c3cn->tid, snd_una, c3cn->snd_una); - goto out_free; - } - - if (c3cn->snd_una != snd_una) { - c3cn->snd_una = snd_una; - dst_confirm(c3cn->dst_cache); - } - - if (skb_queue_len(&c3cn->write_queue)) { - if (c3cn_push_tx_frames(c3cn, 0)) - cxgb3i_conn_tx_open(c3cn); - } else - cxgb3i_conn_tx_open(c3cn); -out_free: - __kfree_skb(skb); -} - -static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx) -{ - struct s3_conn *c3cn = ctx; - - process_cpl_msg(process_wr_ack, c3cn, skb); - return 0; -} - -/* - * for each connection, pre-allocate skbs needed for close/abort requests. So - * that we can service the request right away. - */ -static void c3cn_free_cpl_skbs(struct s3_conn *c3cn) -{ - if (c3cn->cpl_close) - kfree_skb(c3cn->cpl_close); - if (c3cn->cpl_abort_req) - kfree_skb(c3cn->cpl_abort_req); - if (c3cn->cpl_abort_rpl) - kfree_skb(c3cn->cpl_abort_rpl); -} - -static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn) -{ - c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req), - GFP_KERNEL); - if (!c3cn->cpl_close) - return -ENOMEM; - skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req)); - - c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req), - GFP_KERNEL); - if (!c3cn->cpl_abort_req) - goto free_cpl_skbs; - skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req)); - - c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl), - GFP_KERNEL); - if (!c3cn->cpl_abort_rpl) - goto free_cpl_skbs; - skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl)); - - return 0; - -free_cpl_skbs: - c3cn_free_cpl_skbs(c3cn); - return -ENOMEM; -} - -/** - * c3cn_release_offload_resources - release offload resource - * @c3cn: the offloaded iscsi tcp connection. - * Release resources held by an offload connection (TID, L2T entry, etc.) - */ -static void c3cn_release_offload_resources(struct s3_conn *c3cn) -{ - struct t3cdev *cdev = c3cn->cdev; - unsigned int tid = c3cn->tid; - - c3cn->qset = 0; - c3cn_free_cpl_skbs(c3cn); - - if (c3cn->wr_avail != c3cn->wr_max) { - purge_wr_queue(c3cn); - reset_wr_list(c3cn); - } - - if (cdev) { - if (c3cn->l2t) { - l2t_release(L2DATA(cdev), c3cn->l2t); - c3cn->l2t = NULL; - } - if (c3cn->state == C3CN_STATE_CONNECTING) - /* we have ATID */ - s3_free_atid(cdev, tid); - else { - /* we have TID */ - cxgb3_remove_tid(cdev, (void *)c3cn, tid); - c3cn_put(c3cn); - } - } - - c3cn->dst_cache = NULL; - c3cn->cdev = NULL; -} - -/** - * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure - * returns the s3_conn structure allocated. - */ -struct s3_conn *cxgb3i_c3cn_create(void) -{ - struct s3_conn *c3cn; - - c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL); - if (!c3cn) - return NULL; - - /* pre-allocate close/abort cpl, so we don't need to wait for memory - when close/abort is requested. */ - if (c3cn_alloc_cpl_skbs(c3cn) < 0) - goto free_c3cn; - - c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn); - - c3cn->flags = 0; - spin_lock_init(&c3cn->lock); - atomic_set(&c3cn->refcnt, 1); - skb_queue_head_init(&c3cn->receive_queue); - skb_queue_head_init(&c3cn->write_queue); - setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn); - rwlock_init(&c3cn->callback_lock); - - return c3cn; - -free_c3cn: - kfree(c3cn); - return NULL; -} - -static void c3cn_active_close(struct s3_conn *c3cn) -{ - int data_lost; - int close_req = 0; - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - - dst_confirm(c3cn->dst_cache); - - c3cn_hold(c3cn); - spin_lock_bh(&c3cn->lock); - - data_lost = skb_queue_len(&c3cn->receive_queue); - __skb_queue_purge(&c3cn->receive_queue); - - switch (c3cn->state) { - case C3CN_STATE_CLOSED: - case C3CN_STATE_ACTIVE_CLOSE: - case C3CN_STATE_CLOSE_WAIT_1: - case C3CN_STATE_CLOSE_WAIT_2: - case C3CN_STATE_ABORTING: - /* nothing need to be done */ - break; - case C3CN_STATE_CONNECTING: - /* defer until cpl_act_open_rpl or cpl_act_establish */ - c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); - break; - case C3CN_STATE_ESTABLISHED: - close_req = 1; - c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE); - break; - case C3CN_STATE_PASSIVE_CLOSE: - close_req = 1; - c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2); - break; - } - - if (close_req) { - if (data_lost) - /* Unread data was tossed, zap the connection. */ - send_abort_req(c3cn); - else - send_close_req(c3cn); - } - - spin_unlock_bh(&c3cn->lock); - c3cn_put(c3cn); -} - -/** - * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any - * resource held - * @c3cn: the iscsi tcp connection - */ -void cxgb3i_c3cn_release(struct s3_conn *c3cn) -{ - c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - if (unlikely(c3cn->state == C3CN_STATE_CONNECTING)) - c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED); - else if (likely(c3cn->state != C3CN_STATE_CLOSED)) - c3cn_active_close(c3cn); - c3cn_put(c3cn); -} - -static int is_cxgb3_dev(struct net_device *dev) -{ - struct cxgb3i_sdev_data *cdata; - struct net_device *ndev = dev; - - if (dev->priv_flags & IFF_802_1Q_VLAN) - ndev = vlan_dev_real_dev(dev); - - write_lock(&cdata_rwlock); - list_for_each_entry(cdata, &cdata_list, list) { - struct adap_ports *ports = &cdata->ports; - int i; - - for (i = 0; i < ports->nports; i++) - if (ndev == ports->lldevs[i]) { - write_unlock(&cdata_rwlock); - return 1; - } - } - write_unlock(&cdata_rwlock); - return 0; -} - -/** - * cxgb3_egress_dev - return the cxgb3 egress device - * @root_dev: the root device anchoring the search - * @c3cn: the connection used to determine egress port in bonding mode - * @context: in bonding mode, indicates a connection set up or failover - * - * Return egress device or NULL if the egress device isn't one of our ports. - */ -static struct net_device *cxgb3_egress_dev(struct net_device *root_dev, - struct s3_conn *c3cn, - int context) -{ - while (root_dev) { - if (root_dev->priv_flags & IFF_802_1Q_VLAN) - root_dev = vlan_dev_real_dev(root_dev); - else if (is_cxgb3_dev(root_dev)) - return root_dev; - else - return NULL; - } - return NULL; -} - -static struct rtable *find_route(struct net_device *dev, - __be32 saddr, __be32 daddr, - __be16 sport, __be16 dport) -{ - struct rtable *rt; - struct flowi fl = { - .oif = dev ? dev->ifindex : 0, - .nl_u = { - .ip4_u = { - .daddr = daddr, - .saddr = saddr, - .tos = 0 } }, - .proto = IPPROTO_TCP, - .uli_u = { - .ports = { - .sport = sport, - .dport = dport } } }; - - if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0)) - return NULL; - return rt; -} - -/* - * Assign offload parameters to some connection fields. - */ -static void init_offload_conn(struct s3_conn *c3cn, - struct t3cdev *cdev, - struct dst_entry *dst) -{ - BUG_ON(c3cn->cdev != cdev); - c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1; - c3cn->wr_unacked = 0; - c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst)); - - reset_wr_list(c3cn); -} - -static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev) -{ - struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev); - struct t3cdev *cdev = cdata->cdev; - struct dst_entry *dst = c3cn->dst_cache; - struct sk_buff *skb; - - c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n", - c3cn, c3cn->state, c3cn->flags); - /* - * Initialize connection data. Note that the flags and ULP mode are - * initialized higher up ... - */ - c3cn->dev = dev; - c3cn->cdev = cdev; - c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn); - if (c3cn->tid < 0) - goto out_err; - - c3cn->qset = 0; - c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev); - if (!c3cn->l2t) - goto free_tid; - - skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL); - if (!skb) - goto free_l2t; - - skb->sk = (struct sock *)c3cn; - set_arp_failure_handler(skb, act_open_req_arp_failure); - - c3cn_hold(c3cn); - - init_offload_conn(c3cn, cdev, dst); - c3cn->err = 0; - - make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t); - l2t_send(cdev, skb, c3cn->l2t); - return 0; - -free_l2t: - l2t_release(L2DATA(cdev), c3cn->l2t); -free_tid: - s3_free_atid(cdev, c3cn->tid); - c3cn->tid = 0; -out_err: - return -EINVAL; -} - -/** - * cxgb3i_find_dev - find the interface associated with the given address - * @ipaddr: ip address - */ -static struct net_device * -cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr) -{ - struct flowi fl; - int err; - struct rtable *rt; - - memset(&fl, 0, sizeof(fl)); - fl.nl_u.ip4_u.daddr = ipaddr; - - err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl); - if (!err) - return (&rt->dst)->dev; - - return NULL; -} - -/** - * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address - * @c3cn: the iscsi tcp connection - * @usin: destination address - * - * return 0 if active open request is sent, < 0 otherwise. - */ -int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn, - struct sockaddr_in *usin) -{ - struct rtable *rt; - struct cxgb3i_sdev_data *cdata; - struct t3cdev *cdev; - __be32 sipv4; - struct net_device *dstdev; - int err; - - c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev); - - if (usin->sin_family != AF_INET) - return -EAFNOSUPPORT; - - c3cn->daddr.sin_port = usin->sin_port; - c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr; - - dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr); - if (!dstdev || !is_cxgb3_dev(dstdev)) - return -ENETUNREACH; - - if (dstdev->priv_flags & IFF_802_1Q_VLAN) - dev = dstdev; - - rt = find_route(dev, c3cn->saddr.sin_addr.s_addr, - c3cn->daddr.sin_addr.s_addr, - c3cn->saddr.sin_port, - c3cn->daddr.sin_port); - if (rt == NULL) { - c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n", - c3cn->daddr.sin_addr.s_addr, - ntohs(c3cn->daddr.sin_port), - dev ? dev->name : "any"); - return -ENETUNREACH; - } - - if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { - c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n", - c3cn->daddr.sin_addr.s_addr, - ntohs(c3cn->daddr.sin_port), - dev ? dev->name : "any"); - ip_rt_put(rt); - return -ENETUNREACH; - } - - if (!c3cn->saddr.sin_addr.s_addr) - c3cn->saddr.sin_addr.s_addr = rt->rt_src; - - /* now commit destination to connection */ - c3cn->dst_cache = &rt->dst; - - /* try to establish an offloaded connection */ - dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0); - if (dev == NULL) { - c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn); - return -ENETUNREACH; - } - cdata = NDEV2CDATA(dev); - cdev = cdata->cdev; - - /* get a source port if one hasn't been provided */ - err = c3cn_get_port(c3cn, cdata); - if (err) - return err; - - c3cn_conn_debug("c3cn 0x%p get port %u.\n", - c3cn, ntohs(c3cn->saddr.sin_port)); - - sipv4 = cxgb3i_get_private_ipv4addr(dev); - if (!sipv4) { - c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn); - sipv4 = c3cn->saddr.sin_addr.s_addr; - cxgb3i_set_private_ipv4addr(dev, sipv4); - } else - c3cn->saddr.sin_addr.s_addr = sipv4; - - c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n", - c3cn, - &c3cn->saddr.sin_addr.s_addr, - ntohs(c3cn->saddr.sin_port), - &c3cn->daddr.sin_addr.s_addr, - ntohs(c3cn->daddr.sin_port)); - - c3cn_set_state(c3cn, C3CN_STATE_CONNECTING); - if (!initiate_act_open(c3cn, dev)) - return 0; - - /* - * If we get here, we don't have an offload connection so simply - * return a failure. - */ - err = -ENOTSUPP; - - /* - * This trashes the connection and releases the local port, - * if necessary. - */ - c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn); - c3cn_set_state(c3cn, C3CN_STATE_CLOSED); - ip_rt_put(rt); - c3cn_put_port(c3cn); - return err; -} - -/** - * cxgb3i_c3cn_rx_credits - ack received tcp data. - * @c3cn: iscsi tcp connection - * @copied: # of bytes processed - * - * Called after some received data has been read. It returns RX credits - * to the HW for the amount of data processed. - */ -void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied) -{ - struct t3cdev *cdev; - int must_send; - u32 credits, dack = 0; - - if (c3cn->state != C3CN_STATE_ESTABLISHED) - return; - - credits = c3cn->copied_seq - c3cn->rcv_wup; - if (unlikely(!credits)) - return; - - cdev = c3cn->cdev; - - if (unlikely(cxgb3_rx_credit_thres == 0)) - return; - - dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1); - - /* - * For coalescing to work effectively ensure the receive window has - * at least 16KB left. - */ - must_send = credits + 16384 >= cxgb3_rcv_win; - - if (must_send || credits >= cxgb3_rx_credit_thres) - c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack); -} - -/** - * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus - * @c3cn: iscsi tcp connection - * @skb: skb contains the iscsi pdu - * - * Add a list of skbs to a connection send queue. The skbs must comply with - * the max size limit of the device and have a headroom of at least - * TX_HEADER_LEN bytes. - * Return # of bytes queued. - */ -int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb) -{ - struct sk_buff *next; - int err, copied = 0; - - spin_lock_bh(&c3cn->lock); - - if (c3cn->state != C3CN_STATE_ESTABLISHED) { - c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n", - c3cn, c3cn->state); - err = -EAGAIN; - goto out_err; - } - - if (c3cn->err) { - c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err); - err = -EPIPE; - goto out_err; - } - - if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) { - c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n", - c3cn, c3cn->write_seq, c3cn->snd_una, - cxgb3_snd_win); - err = -ENOBUFS; - goto out_err; - } - - while (skb) { - int frags = skb_shinfo(skb)->nr_frags + - (skb->len != skb->data_len); - - if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) { - c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn); - err = -EINVAL; - goto out_err; - } - - if (frags >= SKB_WR_LIST_SIZE) { - cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n", - c3cn, skb_shinfo(skb)->nr_frags, - skb->len, skb->data_len); - err = -EINVAL; - goto out_err; - } - - next = skb->next; - skb->next = NULL; - skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR); - copied += skb->len; - c3cn->write_seq += skb->len + ulp_extra_len(skb); - skb = next; - } -done: - if (likely(skb_queue_len(&c3cn->write_queue))) - c3cn_push_tx_frames(c3cn, 1); - spin_unlock_bh(&c3cn->lock); - return copied; - -out_err: - if (copied == 0 && err == -EPIPE) - copied = c3cn->err ? c3cn->err : -EPIPE; - else - copied = err; - goto done; -} - -static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata) -{ - struct adap_ports *ports = &cdata->ports; - struct s3_conn *c3cn; - int i; - - for (i = 0; i < cxgb3_max_connect; i++) { - if (cdata->sport_conn[i]) { - c3cn = cdata->sport_conn[i]; - cdata->sport_conn[i] = NULL; - - spin_lock_bh(&c3cn->lock); - c3cn->cdev = NULL; - c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN); - c3cn_closed(c3cn); - spin_unlock_bh(&c3cn->lock); - } - } - - for (i = 0; i < ports->nports; i++) - NDEV2CDATA(ports->lldevs[i]) = NULL; - - cxgb3i_free_big_mem(cdata); -} - -void cxgb3i_sdev_cleanup(void) -{ - struct cxgb3i_sdev_data *cdata; - - write_lock(&cdata_rwlock); - list_for_each_entry(cdata, &cdata_list, list) { - list_del(&cdata->list); - sdev_data_cleanup(cdata); - } - write_unlock(&cdata_rwlock); -} - -int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers) -{ - cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish; - cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl; - cpl_handlers[CPL_PEER_CLOSE] = do_peer_close; - cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req; - cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl; - cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl; - cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack; - cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr; - - if (cxgb3_max_connect > CXGB3I_MAX_CONN) - cxgb3_max_connect = CXGB3I_MAX_CONN; - return 0; -} - -/** - * cxgb3i_sdev_add - allocate and initialize resources for each adapter found - * @cdev: t3cdev adapter - * @client: cxgb3 driver client - */ -void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client) -{ - struct cxgb3i_sdev_data *cdata; - struct ofld_page_info rx_page_info; - unsigned int wr_len; - int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *); - int i; - - cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL); - if (!cdata) { - cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n", - cdev, mapsize); - return; - } - - if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 || - cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 || - cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) { - cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n", - cdev); - goto free_cdata; - } - - s3_init_wr_tab(wr_len); - - spin_lock_init(&cdata->lock); - INIT_LIST_HEAD(&cdata->list); - cdata->cdev = cdev; - cdata->client = client; - - for (i = 0; i < cdata->ports.nports; i++) - NDEV2CDATA(cdata->ports.lldevs[i]) = cdata; - - write_lock(&cdata_rwlock); - list_add_tail(&cdata->list, &cdata_list); - write_unlock(&cdata_rwlock); - - cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev); - return; - -free_cdata: - cxgb3i_free_big_mem(cdata); -} - -/** - * cxgb3i_sdev_remove - free the allocated resources for the adapter - * @cdev: t3cdev adapter - */ -void cxgb3i_sdev_remove(struct t3cdev *cdev) -{ - struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev); - - cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev); - - write_lock(&cdata_rwlock); - list_del(&cdata->list); - write_unlock(&cdata_rwlock); - - sdev_data_cleanup(cdata); -} |