RDMA/rxe: Fix extra copies in build_rdma_network_hdr

build_rdma_network_hdr() in rxe_resp.c does more copying than is
needed. Remove this subroutine and eliminate the extra copies for IPV6 and
reduce the extra copying for IPV4.

Fixes: e404f945a610 ("IB/rxe: improved debug prints & code cleanup")
Link: https://lore.kernel.org/r/20210618045742.204195-4-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index 5565d88..5718c8b 100644 (file)
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -785,18 +785,6 @@ static enum resp_states read_reply(struct rxe_qp *qp,
        return state;
 }
 
-static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
-                                  struct rxe_pkt_info *pkt)
-{
-       struct sk_buff *skb = PKT_TO_SKB(pkt);
-
-       memset(hdr, 0, sizeof(*hdr));
-       if (skb->protocol == htons(ETH_P_IP))
-               memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
-       else if (skb->protocol == htons(ETH_P_IPV6))
-               memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
-}
-
 static int invalidate_rkey(struct rxe_qp *qp, u32 rkey)
 {
        if (rkey_is_mw(rkey))
@@ -811,16 +799,23 @@ static int invalidate_rkey(struct rxe_qp *qp, u32 rkey)
 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 {
        enum resp_states err;
+       struct sk_buff *skb = PKT_TO_SKB(pkt);
+       union rdma_network_hdr hdr;
 
        if (pkt->mask & RXE_SEND_MASK) {
                if (qp_type(qp) == IB_QPT_UD ||
                    qp_type(qp) == IB_QPT_SMI ||
                    qp_type(qp) == IB_QPT_GSI) {
-                       union rdma_network_hdr hdr;
-
-                       build_rdma_network_hdr(&hdr, pkt);
-
-                       err = send_data_in(qp, &hdr, sizeof(hdr));
+                       if (skb->protocol == htons(ETH_P_IP)) {
+                               memset(&hdr.reserved, 0,
+                                               sizeof(hdr.reserved));
+                               memcpy(&hdr.roce4grh, ip_hdr(skb),
+                                               sizeof(hdr.roce4grh));
+                               err = send_data_in(qp, &hdr, sizeof(hdr));
+                       } else {
+                               err = send_data_in(qp, ipv6_hdr(skb),
+                                               sizeof(hdr));
+                       }
                        if (err)
                                return err;
                }