Author: jhb Date: Mon Oct 19 20:08:50 2020 New Revision: 366854 URL: https://svnweb.freebsd.org/changeset/base/366854
Log: Re-enable receive flow control for TOE TLS sockets. Flow control was disabled during initial TOE TLS development to workaround a hang (and to match the Linux TOE TLS support for T6). The rest of the TOE TLS code maintained credits as if flow control was enabled which was inherited from before the workaround was added with the exception that the receive window was allowed to go negative. This negative receive window handling (rcv_over) was because I hadn't realized the full implications of disabling flow control. To clean this up, re-enable flow control on TOE TLS sockets. The existing TPF_FORCE_CREDITS workaround is sufficient for the original hang. Now that flow control is enabled, remove the rcv_over workaround and instead assert that the receive window never goes negative matching plain TCP TOE sockets. Reviewed by: np MFC after: 2 weeks Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D26799 Modified: head/sys/dev/cxgbe/tom/t4_cpl_io.c head/sys/dev/cxgbe/tom/t4_tls.c head/sys/dev/cxgbe/tom/t4_tls.h head/sys/dev/cxgbe/tom/t4_tom.c Modified: head/sys/dev/cxgbe/tom/t4_cpl_io.c ============================================================================== --- head/sys/dev/cxgbe/tom/t4_cpl_io.c Mon Oct 19 20:08:47 2020 (r366853) +++ head/sys/dev/cxgbe/tom/t4_cpl_io.c Mon Oct 19 20:08:50 2020 (r366854) @@ -446,16 +446,6 @@ t4_rcvd_locked(struct toedev *tod, struct tcpcb *tp) SOCKBUF_LOCK_ASSERT(sb); rx_credits = sbspace(sb) > tp->rcv_wnd ? sbspace(sb) - tp->rcv_wnd : 0; - if (ulp_mode(toep) == ULP_MODE_TLS) { - if (toep->tls.rcv_over >= rx_credits) { - toep->tls.rcv_over -= rx_credits; - rx_credits = 0; - } else { - rx_credits -= toep->tls.rcv_over; - toep->tls.rcv_over = 0; - } - } - if (rx_credits > 0 && (tp->rcv_wnd <= 32 * 1024 || rx_credits >= 64 * 1024 || (rx_credits >= 16 * 1024 && tp->rcv_wnd <= 128 * 1024) || Modified: head/sys/dev/cxgbe/tom/t4_tls.c ============================================================================== --- head/sys/dev/cxgbe/tom/t4_tls.c Mon Oct 19 20:08:47 2020 (r366853) +++ head/sys/dev/cxgbe/tom/t4_tls.c Mon Oct 19 20:08:50 2020 (r366854) @@ -2045,11 +2045,9 @@ do_rx_tls_cmp(struct sge_iq *iq, const struct rss_head #endif tp->rcv_nxt += pdu_length; - if (tp->rcv_wnd < pdu_length) { - toep->tls.rcv_over += pdu_length - tp->rcv_wnd; - tp->rcv_wnd = 0; - } else - tp->rcv_wnd -= pdu_length; + KASSERT(tp->rcv_wnd >= pdu_length, + ("%s: negative window size", __func__)); + tp->rcv_wnd -= pdu_length; /* XXX: Not sure what to do about urgent data. */ Modified: head/sys/dev/cxgbe/tom/t4_tls.h ============================================================================== --- head/sys/dev/cxgbe/tom/t4_tls.h Mon Oct 19 20:08:47 2020 (r366853) +++ head/sys/dev/cxgbe/tom/t4_tls.h Mon Oct 19 20:08:50 2020 (r366854) @@ -276,7 +276,6 @@ struct tls_ofld_info { enum tls_mode mode; struct callout handshake_timer; u_int sb_off; - u_int rcv_over; }; struct tls_key_req { Modified: head/sys/dev/cxgbe/tom/t4_tom.c ============================================================================== --- head/sys/dev/cxgbe/tom/t4_tom.c Mon Oct 19 20:08:47 2020 (r366853) +++ head/sys/dev/cxgbe/tom/t4_tom.c Mon Oct 19 20:08:50 2020 (r366854) @@ -1036,8 +1036,6 @@ calc_options2(struct vi_info *vi, struct conn_params * if (cp->ulp_mode == ULP_MODE_TCPDDP) opt2 |= F_RX_FC_DDP; #endif - if (cp->ulp_mode == ULP_MODE_TLS) - opt2 |= F_RX_FC_DISABLE; return (htobe32(opt2)); } _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
