[src/trunk]: src/sys/dev/pci add support hardware tcp/udp rx checksum offloading

[ryo <ryo%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/14726037e5d9
branches:  trunk
changeset: 982510:14726037e5d9
user:      ryo <ryo%NetBSD.org@localhost>
date:      Thu Apr 15 09:04:08 2021 +0000

description:
add support hardware tcp/udp rx checksum offloading

diffstat:

 sys/dev/pci/if_aq.c |  28 +++++++++-------------------
 1 files changed, 9 insertions(+), 19 deletions(-)

diffs (70 lines):

diff -r d049b3844d91 -r 14726037e5d9 sys/dev/pci/if_aq.c
--- a/sys/dev/pci/if_aq.c       Thu Apr 15 08:23:24 2021 +0000
+++ b/sys/dev/pci/if_aq.c       Thu Apr 15 09:04:08 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_aq.c,v 1.20 2021/02/18 17:56:04 ryo Exp $   */
+/*     $NetBSD: if_aq.c,v 1.21 2021/04/15 09:04:08 ryo Exp $   */
 
 /**
  * aQuantia Corporation Network Driver
@@ -62,7 +62,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_aq.c,v 1.20 2021/02/18 17:56:04 ryo Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_aq.c,v 1.21 2021/04/15 09:04:08 ryo Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_if_aq.h"
@@ -1445,24 +1445,14 @@
        ifp->if_capabilities |= IFCAP_TSOv4 | IFCAP_TSOv6;
 #endif
 
-#if notyet
-       /*
-        * XXX:
-        *   Rx L4 CSUM doesn't work well for fragment packet.
-        *   aq marks 'CHEDKED' and 'BAD' for them.
-        *   we need to ignore (clear) hw-csum flags if the packet is fragmented
-        *
-        *   TODO: test with LRO enabled
-        */
-       ifp->if_capabilities |= IFCAP_CSUM_TCPv4_Rx | IFCAP_CSUM_TCPv6_Rx;
-       ifp->if_capabilities |= IFCAP_CSUM_UDPv4_Rx | IFCAP_CSUM_UDPv6_Rx;
-#endif
        /* TX hardware checksum offloadding */
        ifp->if_capabilities |= IFCAP_CSUM_IPv4_Tx;
        ifp->if_capabilities |= IFCAP_CSUM_TCPv4_Tx | IFCAP_CSUM_TCPv6_Tx;
        ifp->if_capabilities |= IFCAP_CSUM_UDPv4_Tx | IFCAP_CSUM_UDPv6_Tx;
        /* RX hardware checksum offloadding */
        ifp->if_capabilities |= IFCAP_CSUM_IPv4_Rx;
+       ifp->if_capabilities |= IFCAP_CSUM_TCPv4_Rx | IFCAP_CSUM_TCPv6_Rx;
+       ifp->if_capabilities |= IFCAP_CSUM_UDPv4_Rx | IFCAP_CSUM_UDPv6_Rx;
 
        error = if_initialize(ifp);
        if (error != 0) {
@@ -4365,11 +4355,11 @@
                                        m0->m_pkthdr.csum_flags |=
                                            M_CSUM_IPv4_BAD;
                        }
-#if notyet
+
                        /*
-                        * XXX: aq always marks BAD for fragmented packet.
-                        * we should peek L3 header, and ignore cksum flags
-                        * if the packet is fragmented.
+                        * aq will always mark BAD for fragment packets,
+                        * but this is not a problem because the IP stack
+                        * ignores the CSUM flag in fragment packets.
                         */
                        if (__SHIFTOUT(rxd_type,
                            RXDESC_TYPE_TCPUDP_CSUM_CHECKED)) {
@@ -4422,7 +4412,7 @@
                                            M_CSUM_TCP_UDP_BAD;
                                }
                        }
-#endif
+
                        m_set_rcvif(m0, ifp);
                        if_statinc_ref(nsr, if_ipackets);
                        if_statadd_ref(nsr, if_ibytes, m0->m_pkthdr.len);