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Chuck Lever 60045b2aeb RDMA/core: add rdma_rw_max_sge() helper for SQ sizing 
[ Upstream commit afcae7d7b8 ]

svc_rdma_accept() computes sc_sq_depth as the sum of rq_depth and the
number of rdma_rw contexts (ctxts). This value is used to allocate the
Send CQ and to initialize the sc_sq_avail credit pool.

However, when the device uses memory registration for RDMA operations,
rdma_rw_init_qp() inflates the QP's max_send_wr by a factor of three
per context to account for REG and INV work requests. The Send CQ and
credit pool remain sized for only one work request per context,
causing Send Queue exhaustion under heavy NFS WRITE workloads.

Introduce rdma_rw_max_sge() to compute the actual number of Send Queue
entries required for a given number of rdma_rw contexts. Upper layer
protocols call this helper before creating a Queue Pair so that their
Send CQs and credit accounting match the QP's true capacity.

Update svc_rdma_accept() to use rdma_rw_max_sge() when computing
sc_sq_depth, ensuring the credit pool reflects the work requests
that rdma_rw_init_qp() will reserve.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixes: 00bd1439f4 ("RDMA/rw: Support threshold for registration vs scattering to local pages")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://patch.msgid.link/20260128005400.25147-5-cel@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:19:43 -05:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p net/9p: fix double req put in p9_fd_cancelled 2025-10-19 16:21:28 +02:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-23 17:15:49 +01:00
8021q net: vlan: sync VLAN features with lower device 2025-12-07 06:09:26 +09:00
appletalk net: appletalk: Fix use-after-free in AARP proxy probe 2025-08-28 16:24:04 +02:00
atm net: atm: fix crash due to unvalidated vcc pointer in sigd_send() 2026-03-04 07:19:38 -05:00
ax25 ax25: properly unshare skbs in ax25_kiss_rcv() 2025-09-09 18:50:20 +02:00
batman-adv batman-adv: fix OOB read/write in network-coding decode 2025-09-09 18:50:21 +02:00
bluetooth Bluetooth: hci_event: call disconnect callback before deleting conn 2026-02-11 13:35:34 +01:00
bpf bpf: Do not let BPF test infra emit invalid GSO types to stack 2026-02-06 16:41:58 +01:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge netfilter: replace -EEXIST with -EBUSY 2026-02-11 13:35:30 +01:00
caif caif: fix integer underflow in cffrml_receive() 2026-01-19 13:09:44 +01:00
can net: can: j1939: j1939_xtp_rx_rts_session_active(): deactivate session upon receiving the second rts 2026-02-06 16:41:47 +01:00
ceph libceph: make calc_target() set t->paused, not just clear it 2026-01-19 13:10:14 +01:00
core bpf: Reject narrower access to pointer ctx fields 2026-02-06 16:41:59 +01:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 15:13:53 +02:00
dccp net: fix data-races around sk->sk_forward_alloc 2025-01-23 17:16:04 +01:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 14:52:46 -08:00
dsa net: dsa: free routing table on probe failure 2026-02-19 16:21:45 +01:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2024-09-12 11:07:47 +02:00
ethtool ethtool: add support to set/get tx copybreak buf size via ethtool 2026-03-04 07:19:36 -05:00
hsr net/hsr: fix NULL pointer dereference in prp_get_untagged_frame() 2026-01-19 13:09:46 +01:00
ieee802154 net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() 2024-12-14 19:51:37 +01:00
ife net: sched: ife: fix potential use-after-free 2024-01-05 15:13:29 +01:00
ipv4 tcp: tcp_tx_timestamp() must look at the rtx queue 2026-03-04 07:19:35 -05:00
ipv6 espintcp: fix skb leaks 2026-02-06 16:42:03 +01:00
iucv s390/iucv: fix receive buffer virtual vs physical address confusion 2024-09-04 13:23:27 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:23:32 +02:00
key Revert "xfrm: destroy xfrm_state synchronously on net exit path" 2026-01-19 13:09:18 +01:00
l2tp l2tp: avoid one data-race in l2tp_tunnel_del_work() 2026-02-06 16:41:53 +01:00
l3mdev net: Add l3mdev index to flow struct and avoid oif reset for port devices 2024-10-17 15:11:57 +02:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc: fix data loss when reading from a socket in llc_ui_recvmsg() 2025-06-04 14:38:06 +02:00
mac80211 wifi: mac80211: don't increment crypto_tx_tailroom_needed_cnt twice 2026-02-11 13:35:31 +01:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-01-23 17:16:00 +01:00
mctp net: mctp: Prevent duplicate binds 2025-08-28 16:24:20 +02:00
mpls mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). 2025-06-27 11:05:36 +01:00
mptcp mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() 2026-02-19 16:21:45 +01:00
ncsi net: ncsi: Fix buffer overflow in fetching version id 2025-08-28 16:24:22 +02:00
netfilter netfilter: nft_set_rbtree: check for partial overlaps in anonymous sets 2026-03-04 07:19:36 -05:00
netlabel calipso: unlock rcu before returning -EAFNOSUPPORT 2025-06-27 11:05:22 +01:00
netlink netlink: avoid infinite retry looping in netlink_unicast() 2025-08-28 16:24:15 +02:00
netrom netrom: fix double-free in nr_route_frame() 2026-02-06 16:41:58 +01:00
nfc nfc: hci: shdlc: Stop timers and work before freeing context 2026-03-04 07:19:36 -05:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:50:48 +02:00
openvswitch net: openvswitch: Avoid needlessly taking the RTNL on vport destroy 2026-01-19 13:09:56 +01:00
packet net/packet: fix a race in packet_set_ring() and packet_notifier() 2025-08-28 16:24:14 +02:00
phonet phonet/pep: Move call to pn_skb_get_dst_sockaddr() earlier in pep_sock_accept() 2025-08-28 16:23:59 +02:00
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:36:37 +01:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-10-17 15:11:08 +02:00
rds rds: Fix endianness annotation for RDS_MPATH_HASH 2025-12-07 06:09:19 +09:00
rfkill net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer 2025-10-02 13:39:09 +02:00
rose net: rose: fix invalid array index in rose_kill_by_device() 2026-01-19 13:09:58 +01:00
rxrpc rxrpc: Fix oops due to non-existence of prealloc backlog struct 2025-07-17 18:30:48 +02:00
sched net/sched: act_ife: convert comma to semicolon 2026-02-06 16:42:05 +01:00
sctp sctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT 2026-02-06 16:41:52 +01:00
smc net/smc: fix mismatch between CLC header and proposal 2025-12-07 06:09:27 +09:00
strparser strparser: Fix signed/unsigned mismatch bug 2025-12-07 06:09:29 +09:00
sunrpc RDMA/core: add rdma_rw_max_sge() helper for SQ sizing 2026-03-04 07:19:43 -05:00
switchdev net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 2021-08-04 12:35:07 +01:00
tipc tipc: use kfree_sensitive() for session key material 2026-02-11 13:35:32 +01:00
tls tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock(). 2026-02-06 16:42:01 +01:00
unix af_unix: Don't leave consecutive consumed OOB skbs. 2025-10-02 13:39:14 +02:00
vmw_vsock vsock: Ignore signal/timeout on connect() if already established 2025-12-07 06:09:31 +09:00
wireless wifi: cfg80211: stop NAN and P2P in cfg80211_leave 2026-03-04 07:19:33 -05:00
x25 net/x25: fix incorrect parameter validation in the x25_getsockopt() function 2024-03-26 18:21:23 -04:00
xdp xsk: fix OOB map writes when deleting elements 2024-12-14 19:51:33 +01:00
xfrm espintcp: fix skb leaks 2026-02-06 16:42:03 +01:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
socket.c net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF. 2026-01-19 13:10:11 +01:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00