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| author | Guangguan Wang <guangguan.wang@linux.alibaba.com> | 2024-06-03 11:00:18 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-06-03 12:12:41 +0100 |
| commit | 3ac14b9dfbd345e891d48d89f6c2fa519848f0f4 (patch) | |
| tree | d862691b5997c789f69021aeb3fb0db0b30d43ac /net/smc | |
| parent | b5c089880723b2c18531c40e445235bd646a51d1 (diff) | |
| download | linux-stable-3ac14b9dfbd345e891d48d89f6c2fa519848f0f4.tar.gz linux-stable-3ac14b9dfbd345e891d48d89f6c2fa519848f0f4.tar.bz2 linux-stable-3ac14b9dfbd345e891d48d89f6c2fa519848f0f4.zip | |
net/smc: set rmb's SG_MAX_SINGLE_ALLOC limitation only when CONFIG_ARCH_NO_SG_CHAIN is defined
SG_MAX_SINGLE_ALLOC is used to limit maximum number of entries that
will be allocated in one piece of scatterlist. When the entries of
scatterlist exceeds SG_MAX_SINGLE_ALLOC, sg chain will be used. From
commit 7c703e54cc71 ("arch: switch the default on ARCH_HAS_SG_CHAIN"),
we can know that the macro CONFIG_ARCH_NO_SG_CHAIN is used to identify
whether sg chain is supported. So, SMC-R's rmb buffer should be limited
by SG_MAX_SINGLE_ALLOC only when the macro CONFIG_ARCH_NO_SG_CHAIN is
defined.
Fixes: a3fe3d01bd0d ("net/smc: introduce sg-logic for RMBs")
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Co-developed-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc')
| -rw-r--r-- | net/smc/smc_core.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index fafdb97adfad..acca3b1a068f 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -2015,7 +2015,6 @@ out: */ static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) { - const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE; u8 compressed; if (size <= SMC_BUF_MIN_SIZE) @@ -2025,9 +2024,11 @@ static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) compressed = min_t(u8, ilog2(size) + 1, is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); +#ifdef CONFIG_ARCH_NO_SG_CHAIN if (!is_smcd && is_rmb) /* RMBs are backed by & limited to max size of scatterlists */ - compressed = min_t(u8, compressed, ilog2(max_scat >> 14)); + compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14)); +#endif return compressed; } |