diff options
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 9 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/xprt_rdma.h | 23 |
2 files changed, 18 insertions, 14 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 805b1f35e1ca..e639ea0faf19 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -53,6 +53,7 @@ #include <linux/slab.h> #include <linux/sunrpc/addr.h> #include <linux/sunrpc/svc_rdma.h> +#include <linux/log2.h> #include <asm-generic/barrier.h> #include <asm/bitops.h> @@ -1000,12 +1001,18 @@ struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size, struct rpcrdma_buffer *buffer = &r_xprt->rx_buf; struct rpcrdma_regbuf *rb; struct rpcrdma_req *req; + size_t maxhdrsize; req = kzalloc(sizeof(*req), flags); if (req == NULL) goto out1; - rb = rpcrdma_regbuf_alloc(RPCRDMA_HDRBUF_SIZE, DMA_TO_DEVICE, flags); + /* Compute maximum header buffer size in bytes */ + maxhdrsize = rpcrdma_fixed_maxsz + 3 + + r_xprt->rx_ia.ri_max_segs * rpcrdma_readchunk_maxsz; + maxhdrsize *= sizeof(__be32); + rb = rpcrdma_regbuf_alloc(__roundup_pow_of_two(maxhdrsize), + DMA_TO_DEVICE, flags); if (!rb) goto out2; req->rl_rdmabuf = rb; diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index 3b2f2041e889..eaf6b907a76e 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -155,25 +155,22 @@ static inline void *rdmab_data(const struct rpcrdma_regbuf *rb) /* To ensure a transport can always make forward progress, * the number of RDMA segments allowed in header chunk lists - * is capped at 8. This prevents less-capable devices and - * memory registrations from overrunning the Send buffer - * while building chunk lists. + * is capped at 16. This prevents less-capable devices from + * overrunning the Send buffer while building chunk lists. * * Elements of the Read list take up more room than the - * Write list or Reply chunk. 8 read segments means the Read - * list (or Write list or Reply chunk) cannot consume more - * than + * Write list or Reply chunk. 16 read segments means the + * chunk lists cannot consume more than * - * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes. + * ((16 + 2) * read segment size) + 1 XDR words, * - * And the fixed part of the header is another 24 bytes. - * - * The smallest inline threshold is 1024 bytes, ensuring that - * at least 750 bytes are available for RPC messages. + * or about 400 bytes. The fixed part of the header is + * another 24 bytes. Thus when the inline threshold is + * 1024 bytes, at least 600 bytes are available for RPC + * message bodies. */ enum { - RPCRDMA_MAX_HDR_SEGS = 8, - RPCRDMA_HDRBUF_SIZE = 256, + RPCRDMA_MAX_HDR_SEGS = 16, }; /* |