From b408ff282dda0ef7a3218dc2e5f1399c665d4c20 Mon Sep 17 00:00:00 2001 From: Hariprasad Shenai Date: Fri, 6 Jun 2014 21:40:44 +0530 Subject: [PATCH] iw_cxgb4: don't truncate the recv window size Fixed a bug that shows up with recv window sizes that exceed the size of the RCV_BUFSIZ field in opt0 (>= 1024K). If the recv window exceeds this, then we specify the max possible in opt0, add add the rest in via a RX_DATA_ACK credits. Signed-off-by: Steve Wise Signed-off-by: Hariprasad Shenai Signed-off-by: David S. Miller --- drivers/infiniband/hw/cxgb4/cm.c | 54 +++++++++++++++++++-- drivers/infiniband/hw/cxgb4/iw_cxgb4.h | 2 + drivers/net/ethernet/chelsio/cxgb4/t4_msg.h | 1 + 3 files changed, 53 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index d2e9f72ec9bf..965eaafd5851 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -472,7 +472,7 @@ static void send_flowc(struct c4iw_ep *ep, struct sk_buff *skb) flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT; flowc->mnemval[5].val = cpu_to_be32(ep->rcv_seq); flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF; - flowc->mnemval[6].val = cpu_to_be32(snd_win); + flowc->mnemval[6].val = cpu_to_be32(ep->snd_win); flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS; flowc->mnemval[7].val = cpu_to_be32(ep->emss); /* Pad WR to 16 byte boundary */ @@ -565,6 +565,7 @@ static int send_connect(struct c4iw_ep *ep) struct sockaddr_in *ra = (struct sockaddr_in *)&ep->com.remote_addr; struct sockaddr_in6 *la6 = (struct sockaddr_in6 *)&ep->com.local_addr; struct sockaddr_in6 *ra6 = (struct sockaddr_in6 *)&ep->com.remote_addr; + int win; wrlen = (ep->com.remote_addr.ss_family == AF_INET) ? roundup(sizev4, 16) : @@ -583,6 +584,15 @@ static int send_connect(struct c4iw_ep *ep) best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx, enable_tcp_timestamps); wscale = compute_wscale(rcv_win); + + /* + * Specify the largest window that will fit in opt0. The + * remainder will be specified in the rx_data_ack. + */ + win = ep->rcv_win >> 10; + if (win > RCV_BUFSIZ_MASK) + win = RCV_BUFSIZ_MASK; + opt0 = (nocong ? NO_CONG(1) : 0) | KEEP_ALIVE(1) | DELACK(1) | @@ -593,7 +603,7 @@ static int send_connect(struct c4iw_ep *ep) SMAC_SEL(ep->smac_idx) | DSCP(ep->tos) | ULP_MODE(ULP_MODE_TCPDDP) | - RCV_BUFSIZ(rcv_win>>10); + RCV_BUFSIZ(win); opt2 = RX_CHANNEL(0) | CCTRL_ECN(enable_ecn) | RSS_QUEUE_VALID | RSS_QUEUE(ep->rss_qid); @@ -1174,6 +1184,14 @@ static int update_rx_credits(struct c4iw_ep *ep, u32 credits) return 0; } + /* + * If we couldn't specify the entire rcv window at connection setup + * due to the limit in the number of bits in the RCV_BUFSIZ field, + * then add the overage in to the credits returned. + */ + if (ep->rcv_win > RCV_BUFSIZ_MASK * 1024) + credits += ep->rcv_win - RCV_BUFSIZ_MASK * 1024; + req = (struct cpl_rx_data_ack *) skb_put(skb, wrlen); memset(req, 0, wrlen); INIT_TP_WR(req, ep->hwtid); @@ -1647,6 +1665,7 @@ static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid) unsigned int mtu_idx; int wscale; struct sockaddr_in *sin; + int win; skb = get_skb(NULL, sizeof(*req), GFP_KERNEL); req = (struct fw_ofld_connection_wr *)__skb_put(skb, sizeof(*req)); @@ -1672,6 +1691,15 @@ static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid) best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx, enable_tcp_timestamps); wscale = compute_wscale(rcv_win); + + /* + * Specify the largest window that will fit in opt0. The + * remainder will be specified in the rx_data_ack. + */ + win = ep->rcv_win >> 10; + if (win > RCV_BUFSIZ_MASK) + win = RCV_BUFSIZ_MASK; + req->tcb.opt0 = (__force __be64) (TCAM_BYPASS(1) | (nocong ? NO_CONG(1) : 0) | KEEP_ALIVE(1) | @@ -1683,7 +1711,7 @@ static void send_fw_act_open_req(struct c4iw_ep *ep, unsigned int atid) SMAC_SEL(ep->smac_idx) | DSCP(ep->tos) | ULP_MODE(ULP_MODE_TCPDDP) | - RCV_BUFSIZ(rcv_win >> 10)); + RCV_BUFSIZ(win)); req->tcb.opt2 = (__force __be32) (PACE(1) | TX_QUEUE(ep->com.dev->rdev.lldi.tx_modq[ep->tx_chan]) | RX_CHANNEL(0) | @@ -1720,6 +1748,13 @@ static int is_neg_adv(unsigned int status) status == CPL_ERR_KEEPALV_NEG_ADVICE; } +static void set_tcp_window(struct c4iw_ep *ep, struct port_info *pi) +{ + ep->snd_win = snd_win; + ep->rcv_win = rcv_win; + PDBG("%s snd_win %d rcv_win %d\n", __func__, ep->snd_win, ep->rcv_win); +} + #define ACT_OPEN_RETRY_COUNT 2 static int import_ep(struct c4iw_ep *ep, int iptype, __u8 *peer_ip, @@ -1768,6 +1803,7 @@ static int import_ep(struct c4iw_ep *ep, int iptype, __u8 *peer_ip, ep->ctrlq_idx = cxgb4_port_idx(pdev); ep->rss_qid = cdev->rdev.lldi.rxq_ids[ cxgb4_port_idx(pdev) * step]; + set_tcp_window(ep, (struct port_info *)netdev_priv(pdev)); dev_put(pdev); } else { pdev = get_real_dev(n->dev); @@ -1786,6 +1822,7 @@ static int import_ep(struct c4iw_ep *ep, int iptype, __u8 *peer_ip, cdev->rdev.lldi.nchan; ep->rss_qid = cdev->rdev.lldi.rxq_ids[ cxgb4_port_idx(n->dev) * step]; + set_tcp_window(ep, (struct port_info *)netdev_priv(pdev)); if (clear_mpa_v1) { ep->retry_with_mpa_v1 = 0; @@ -2017,6 +2054,7 @@ static void accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, u32 opt2; int wscale; struct cpl_t5_pass_accept_rpl *rpl5 = NULL; + int win; PDBG("%s ep %p tid %u\n", __func__, ep, ep->hwtid); BUG_ON(skb_cloned(skb)); @@ -2037,6 +2075,14 @@ static void accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, best_mtu(ep->com.dev->rdev.lldi.mtus, ep->mtu, &mtu_idx, enable_tcp_timestamps && req->tcpopt.tstamp); wscale = compute_wscale(rcv_win); + + /* + * Specify the largest window that will fit in opt0. The + * remainder will be specified in the rx_data_ack. + */ + win = ep->rcv_win >> 10; + if (win > RCV_BUFSIZ_MASK) + win = RCV_BUFSIZ_MASK; opt0 = (nocong ? NO_CONG(1) : 0) | KEEP_ALIVE(1) | DELACK(1) | @@ -2047,7 +2093,7 @@ static void accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, SMAC_SEL(ep->smac_idx) | DSCP(ep->tos >> 2) | ULP_MODE(ULP_MODE_TCPDDP) | - RCV_BUFSIZ(rcv_win>>10); + RCV_BUFSIZ(win); opt2 = RX_CHANNEL(0) | RSS_QUEUE_VALID | RSS_QUEUE(ep->rss_qid); diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h index 7474b490760a..7493dfeb812a 100644 --- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h +++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h @@ -805,6 +805,8 @@ struct c4iw_ep { u8 retry_with_mpa_v1; u8 tried_with_mpa_v1; unsigned int retry_count; + int snd_win; + int rcv_win; }; static inline struct c4iw_ep *to_ep(struct iw_cm_id *cm_id) diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h index a4d7bdb20866..973eb11aa98a 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h @@ -227,6 +227,7 @@ struct cpl_pass_open_req { #define DELACK(x) ((x) << 5) #define ULP_MODE(x) ((x) << 8) #define RCV_BUFSIZ(x) ((x) << 12) +#define RCV_BUFSIZ_MASK 0x3FFU #define DSCP(x) ((x) << 22) #define SMAC_SEL(x) ((u64)(x) << 28) #define L2T_IDX(x) ((u64)(x) << 36) -- 2.20.1